ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
CONCEPTUAL PLAN INTRODUCTION
The project is an Integrated Complex “Sobha City” developed by M/s Sobha Limited. The promoters are recognized as a trailblazer in the Real Estate Industry. Having key personals, which have vast experience in planning and construction of Residential, Commercial and Institutional projects. The group is developing Integrated Complex project which is located at Puzhakkal, Guruvayyur Road, District: Thrissur, Kerala on a land admeasuring 2, 29,535.91 sqm.
We have already obtained Environmental Clearance vide letter no. 21-713/2007-IA.III dated 17/04/2008 for plot area 2, 29, 535.91 m2 and built up area of 3, 24,665.28 m2 is enclosed as Annexure I.
M/s Sobha Limited is now proposing the reduction of facilities in the project with decrease plot area to 2, 22,593.838 m2 and decrease in built up area of 2, 56,017 m2. The reduced in facilities includes the following: Residential apartments (G +26 UF, G + 23 UF, G +6 UF, G +25UF) Villas (G +1 UF) Plots Shopping Malls (G +2 UF) Club House (G +2 UF)
Table 1: Essential facilities
S. Particulars As per EC (m2) Total Proposed Remarks No. (Nos) (Nos) 1. Residential Apartments 1080 720 Completed Units 648 Nos. 2. Villas 25 25 Under Operation 3. Rooms Hotel 107 - 4. Bed Hospital 200 - Reduced facility 5. Plots - 31 Proposed 6. Shopping mall -1 1 7. Club House -1 1 Under Operation
Table 2: Block Details
M/s SOBHA LIMITED 80 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
S. No Already Proposed blocks as per Proposed Blocks Block Names EC 1 Block Names Lake Front Villas Malachite 2 Sobha Topaz Block Names Lake Front Apartment Sobha Sapphire Sobha Jade 3 Lake Side Apartment & Block Names Sobha Life Style - Villas Convention Centre 4 Integrated Commercial Building Lake Edge Apartment and Block Names (Hotel and Mall) Commercial Building 5 Block Names Hospital Plots 6 Block Names Club House Club House
SITE LOCATION AND SURROUNDINGS
The project site is located at Sy. No- 217, 218, 534 to 544, 546 to 556, Puzhakkal, Guruvayyur Road, District: Thrissur, Kerala. The geographical Co-ordinates of project site are 10°33'0.00"N & 76° 10'55.0"E. Google earth image & Toposheet showing project site & surroundings within 500 m, 10 km & 15 km respectively is attached as Annexure II (a) & II (b).
CONNECTIVITY
The area has good infrastructure facilities. The nearest railway station is Amala Nagar Railway Station at a distance of approx 1.5 km towards NW direction. The nearest Airport Cochin International Airport is about 49 km towards SE direction away from the site. The national highway, NH - 544 is about 9.0 km towards ESE direction from the project site.
PROJECT COST
The total project cost of the project will be 409.04 Crores.
AREA STATEMENT
M/s SOBHA LIMITED 81 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
The project is being developed on total plot area measuring 2, 22,593.838m2 (or 55.01 acres). The detailed area statement is provided below:
Table 3: Detailed Area Statement S. Particulars As per EC (m2) Total Proposed (m2) No. 1. Total Plot Area 2,29,535.91 2,22,593.838 2. Permissible Ground Coverage 1,49,198.3 1,49,965.8 (@65 % of plot area) 3. Proposed Ground Coverage (@68 % of plot area) (@30.48 % of plot area) 97,971.27 70,339.457 4. Proposed FAR 2,44,564.448 1,92,852.965 a. Malachite (Lake Front Villas) 8,605.425 8605.425 b. Sobha Topaz (Lake Front Apartment) 44,270.03 44,270.03 c. Sobha Sapphire (Lake Front Apartment) 43,970.40 43,970.40 d. Sobha Jade (Lake Front Apartment) 42,260.38 42,260.38 e. Club House 3,318.37 3,318.37 f. Commercial 38,320.42 30,217.83 g. Lake Edge (Hotel) 25,629.77 20,210.53 h. Lake Side Apartment (Life style 38,189.685 - plots) 5. Non FAR 80,100.8 63,164.035 6. Built-up Area (5+6) 3,24,665.28 2,56,017.00 7. Green Area Proposed 80,440.71 70,514.25 8. Maximum Building Height (m) 83.1 84.05
BUILT-UP AREA BREAK-UP
Table 4: Built-up area break-up
M/s SOBHA LIMITED 82 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
S. No. Particulars As per EC (m2) Total Proposed (m2) 1. Proposed FAR 2,44,564.448 1,92,852.965 a. Malachite (Lake Front Villas) 8,605.425 8605.425 b. Sobha Topaz (Lake Front Apartment) 44,270.03 44,270.03 c. Sobha Sapphire (Lake Front Apartment) 43,970.40 43,970.40 d. Sobha Jade (Lake Front Apartment) 42,260.38 42,260.38 e. Club House 3,318.37 3,318.37 f. Commercial 38,320.42 30,217.83 g. Lake Edge (Hotel) 25,629.77 20,210.53 h. Lake Side Apartment (Life style 38,189.685 - plots) 2. Non FAR 80,100.8 63,164.035 Total Built-up Area 3,24,665.28 2,56,017.00
POPULATION DENSITY
The total population of proposed project is 9886persons. The detailed population break-up is given below in Table 3. Table 5: Population Break-up S.no Particulars Units PPU Total population 1. 720 5 3600 Residential apartments 2. Villas 25 5 125 3. Plots 31 5 155 Total Residential Population 3880 4. Maintenance Staff @5% of residential population 194 5. Visitors @10% of residential population 388 4 Club House @10% of residential population 388 5 Commercial Mall @ 1 person / 6sqm 5036 (30,217.83m2) Staff 10% of population 504
M/s SOBHA LIMITED 83 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Visitors 90 % of population 4532 Grand Total 9886
WATER REQUIREMENT & SUPPLY SYSTEM
During operation phase, the source of water supply will be artificial Lake/Reservoir. The total water requirement is approx. 858KLD, out of which total domestic water requirement is 646KLD. The fresh water requirement is approx. 452 KLD and the one time fresh water requirement will be 858 KLD. The daily water requirement calculation is given below in Table 5 & 6: Table 6: Comparative water requirement details S. No. Particulars As per EC (KLD) Total Proposed (KLD) 1 Total Water 1301.5 858 2 Fresh water 940 452 3 STP 2000 KL 790KL
Table 7: Calculations for Daily Water Demand
Rate of water Water S. Description Occupancy demand (lpcd) Requirement No (KLD) A. Domestic Water 1) Residential apartments 3600 135 486 2) Villas 125 135 17 3) Plots 155 135 21 4) Staff (Maintenance, 698 45 31.41 Commercial) 5) Club House 388 45 17.5 6) Visitors (residential, 4920 15 74 Commercial) Total Domestic Water 646 KLD B. Horticulture 3 l/sqm/day 211.5 (70,514.25m2) Grand Total Water (A+B) = 858 KLD
M/s SOBHA LIMITED 84 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
TABLE 8: WASTE WATER CALCULATIONS DOMESTIC WATER REQUIREMENT 646 KLD Fresh (70% of Domestic water) 452 KLD Flushing (30% of Domestic water) 194 KLD Waste water generated [@80% fresh + 100% flushing] 362 + 194 = 556 KLD STP Capacity 790 KL
The water balance diagram for non-rainy and rainy season is shown below in Figure 1&2 respectively.
FRESH WATER* @ 80% SULLAGE GENERATED = (452 KLD) @70% of (556 KLD) Domestic Water @ 100% STP CAPACITY = 860 KL
FLUSHING 194 KLD (194 KLD) @ 30% of Domestic Water
KLD
211 KLD 500
HORTICULTURE = (211 KLD) 0% 0% 9 @
DISCHARGE TO 95 KLD EXTERNAL SEWER (95 KLD)
Wastewater
Treated effluent
Figure 1: Water balance diagram for Non-Rainy Season
M/s SOBHA LIMITED 85 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
FRESH WATER* @ 80% SULLAGE GENERATED = (452 KLD) @70% of (556 KLD) Domestic Water @ 100% STP CAPACITY = 860 KL
FLUSHING 194 KLD (194 KLD) @ 30% of Domestic Water
KLD 500 = 0% 0% 9 @
DISCHARGE TO 306 KLD EXTERNAL SEWER (306KLD)
Wastewater
Treated effluent
Figure 2: Water balance diagram for Rainy Season
Sullage Generation & Treatment It is expected that the project will generate approx. 556 KLD of wastewater. The wastewater will be treated in onsite 4 No’s of STP of capacities 1 X 160 KLD, 2 X 190 KLD and 1 X 320 KLD. The treated effluent will be reused for flushing & horticulture. Surplus treated effluent will be discharged to external sewer.
SEWAGE TREATMENT PLANT
STP OF CAPACITY: 1 x 190 KLD AND 1 X 250 KLD TECHNOLOGY - EXTENDED AERATION WITH ULTRA-FILTRATION
M/s SOBHA LIMITED 86 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Sewage Treatment plant is provided for treating all waste water generated due to domestic activities in the Residential apartments. This facility is installed not only for complying the legal requirement of Pollution control board, but also to ensure that the treated water is utilized for gardening and flushing activities.
The treatment Process / system is designed on the principle of Extended Aeration with Ultra- Filtration, which ensures the aerobic decomposition of organic matter in presence of active microbial growth in the aeration tank, with Ultra filtration.
PROCESS DESIGN BASIS
Basis of Design
Raw Sewage Quality Parameters
Sl Parameter Units Inlet Wastewater No quality 1 pH - 7.5 – 8.5 2 BOD mg/l 250 – 300 mg/L 3 TSS mg/l 200 – 350 mg/L 4 COD mg/l 600 – 800 mg/L 5 E-coli - 106 – 107 MPN / 100ml 6 Oil & Grease mg/l 10 mg/L
Treated Sewage Quality Parameters
Sl Parameter Units Outlet treated No Wastewater quality 1 pH - 6.0 – 9.0 2 BOD mg/l 10
M/s SOBHA LIMITED 87 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
3 Turbidity NTU 2 4 E-coli - Nil 5 Residual mg/l ≥1 Chlorine
PROCESS
In the sewage treatment plant (S.T.P.), Extended Aeration with Ultra-Filtration technology is given. The treatment units in the plant consists of
Bar Screen Chamber Oil & Grease Chamber Equalization tank Anoxic Zone Tank Aeration tank Secondary Settling Tank Clarified water tank Pressure sand filter Activated carbon filter Treated Water Tank – I Ultra-filtration system Treated water tank – II Sludge holding tank Filter press
1. Pretreatment system Raw sewage generated from various sources is collected in the Equalization Tank, after passing through a manually operated Bar Screen that screens the large, floating matter. The collected screenings are disposed off manually. In the equalization tank, sufficient retention time is provided to equalize and homogenize the variations in the flow and pollutant
M/s SOBHA LIMITED 88 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA concentration. A Coarse Bubble Air Mixing System is provided to mix, and Keep the sewage in an aerobic condition.
2. De-nitrification Process- Anoxic Zone Tank From Equalization Tank sewage flows into Anoxic Zone Tank. Here removal of nitrogen in the form of nitrate by conversion to nitrogen gas can be accomplished biologically under anoxic (without oxygen) conditions. The process is known as de-nitrification.
3. Secondary Treatment System - Aeration Tank From the Anoxic Zone tank, sewage is pumped into the Aeration tank. In aeration tank sufficient amount of air is supplied to oxidize the organics absorbed by the bacterial biomass.
4. Secondary Settling Tank It clarifies the water by removing suspended solids and the biomass. Clarification takes place as the result of settling of both biomass and suspended impurities. Hopper bottom is provided because when sewage after bacterial activity rests for a given time bio-mass and suspended impurities being heavier tend to settle at the bottom of Secondary settling tank. Conical bottom helps this mass (called sludge) to slide down the slope and accumulate near the pit which is connected to the sludge sump.
5. Clarified water Tank The clarified water is collected in clarified water tank which is the overflow of secondary settling tank.
6. Filtration Clarified water is then pumped through the Pressure Sand Filter then to Activated Carbon Filter to remove the traces of suspended solids, organics, colour and odour present in the treated sewage and it is disinfected using hypo solution. It is collected in Treated Water Tank-I which will be used for landscaping.
M/s SOBHA LIMITED 89 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
7. Ultra-filtration (UF) Treatment The treated water from Treated Water Tank –I is pumped to UF. It removes the fouling materials like particulate matter, suspended solids, bacteria and viruses, colloidal materials (non-reactive silica, iron, aluminium, slit etc.,), high molecular weight organic compounds. Ultra-filtration is to treat 9 m3/hr of filtered water at a recovery of 90-95%. This is collected in Treated Water Tank –II which is used for flushing.
8. Sludge Dewatering/Handling Sludge which is collected in the sludge holding tank will be removed frequently. This sludge is therefore pumped to filter press. The filter press is a mechanical device which converts the sludge into sludge cakes. After the formation of sludge cakes the sludge has to be disposed off suitably. The filtrate water from the filter press is again recycled to equalization tank by means of a sump pump.
DESIGN DETAILS for STP – 250 KLD:
A. BAR SCREEN Flow to Bar Screen Chamber = 10.41 cum/hr Velocity through Screen = 0.6 m/s Net Area of Screen = Q / (3600 X velocity through screen) = 10.41/ (3600 X 0.6) = 0.0048 m2 /hr Adopting the screen with 5mm (flat) and 10 mm opening Gross area will be = (0.0048 X 5) / 10 = 0.0024 m2 Assuming 50% of clogging = 0.0024 X 2 Screen area will be = 0.0048 m2 Dimension of the tank = 1.5 m x 0.7 m x 0.8 m (SWD)
M/s SOBHA LIMITED 90 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
TYPE OF SCREEN: Mechanical Screening System, M.S. Epoxy coated inclined bar screen.
B. OIL & GREASE CHAMBER Peak flow to the Chamber = 10.41 m3/hr Retention Time = 5 min Volume of the Tank = (10.41 m3 / 60) x 5 min = 0.86 m3 Dimension of the tank = 9.1 m x 1.0 m x 1.3 m (SWD)
C. RAW SEWAGE TANK (RST)/ EQUALIZATION TANK
Flow = 10.41 m3/hr Detention Time = 10.5 hrs Volume = 10.41 m3/hr X 10 hrs = 109.30 m3 Dimension of the tank = 54.6 m2 X 2.0 m, SWD
D. ANOXIC ZONE TANK
Flow = 10.41 m3/hr Detention Time = 4.3 hrs Volume of the Tank = 10.41 X 4 hrs = 44.76 m3 Dimension of the tank (Tank-I) = 3.9 m X 1.55 m X 3.7 m, SWD (Tank-II) = 4.0 m X 1.5 m X 3.7 m, SWD
E. AERATION TANK
Flow = 10.41 m3/hr Detention Time = 16.2 hrs Volume of the Tank = 10.41 X 13 hrs
M/s SOBHA LIMITED 91 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
= 168.64 m3 Dimension of the tank = 12.0 m X 4.0 m X 3.5 m, SWD
Air Requirement: Flow : 250 m3/ day Inlet BOD : 0.35 kg/cum BOD Load : 250 cum/d X 0.35 kg/cum Total BOD : 87.5 kg/day O2 required : 1.8 kg/kg of BOD Total O2 required : 157.5 kg/day : 6.56 Kgs./hr Air required : 6.56 kg of Oxygen/ hr 1.2* x 0.232 ** x 0.65 *** x 0.95 **** 0.23 ***** : 168 m3/hr
Air Requirement in Equalization Tank = 0.5 * Volume of Equalization Tank = 0.5 * 104.1 = 52 m3/hr
Sludge Holding Tank = 30 m3/hr
F. SECONDARY SETTLING TANK
Flow = 10.41 m3/hr Detention time = 4.3 hrs Volume of the tank = 10.41 X 4 = 44.76 m3 Dimension of the tank = 4.0 m X 4.0 m X 2.8 m, SWD
G. CLARIFIED WATER TANK
M/s SOBHA LIMITED 92 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Flow = 10.41 m3/hr Detention time = 7.5 hrs Volume of the tank = 10.41 X 7 = 78 m3 Dimension of the tank = 7.15 m X 5.35 m X 2.0 m, SWD
H. PRESSURE SAND FILTER Velocity of percolation through Pressure Sand Filter = 15 m/hr Diameter of the Filter is 1.2 m, 2 m HOS.
I. ACTIVATED CARBON FILTER Velocity of percolation through Activated Carbon Filter =15 m/hr Diameter of the Filter is 1.2 m, 2 m HOS.
J. HYPO DOSING Hypo dosing pump = 12 lph Capacity = 200 Lts.
K. SLUDGE HOLDING TANK Sludge Volume = 1 to 2% of Flow = 2 % of 250 m3/day = 5.0 m3/day Detention Time = 4 Days Volume of the tank = 20 m3 Provide a tank of dimension = 4.0 m X 1.5 m X 3.5 m, SWD
L.TREATED WATER TANK - 01
Flow = 10.41 m3/hr Detention Time = 13.9 hrs
M/s SOBHA LIMITED 93 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Volume of the Tank = 144.69 m3 Provide a tank of dimension = 10.3 m X 4.0 m X 3.5 m, SWD
M. ULTRA FILTRATION 35% of total flow = 250 X 35% Capacity of UF per day = 87.5 m3/day Capacity of UF = 3.64 m3/hr
N. TREATED WATER TANK - 02
Flow = 10.41 m3/hr Detention Time = 6 hrs Volume of the Tank = 62.46 m3 Provide a tank of dimension = 7.15 m X 2.5 m X 3.5 m, SWD
STP SPECIFICATIONS ARE SUMMARIZED AS FOLLOWS
SL. Dimension No. Description Qty MOC
Bar Screen Chamber 1 1.5 m x 0.7 m x 0.8 m , SWD RCC 1
2 Oil & Grease Tank 1 9.1 m x 1.0 m x 1.3 m , SWD RCC
Raw Water Tank/ 3 54.6 m2 X 2.0 m, SWD RCC Equalization Chamber 1 Anoxic Zone Tank- Tank I 1 3.9 m X 1.55 m X 3.7 m, SWD 4 RCC Tank II 1 4.0 m X 1.5 m X 3.7 m, SWD 5 Aeration Tank 1 12.0 m X 4.0 m X 3.5 m, SWD RCC
6 Secondary Settling Tank 4.0 m X 4.0 m X 2.8 m, SWD RCC 1
7 Clarified Water Tank 7.15 m X 5.35 m X 2.0 m, SWD RCC 1
M/s SOBHA LIMITED 94 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Pressure Sand Filter 1.2 m Diameter, 2 m HOS MSEP 1 8 Activated Carbon Filter 1 1.2 m Diameter, 2 m HOS MSEP
9 Sludge Holding Tank 1 4.0 m X 1.5 m X 3.5 m, SWD RCC 10 Treated Water Tank - I 1 10.3 m X 4.0 m X 3.5 m, SWD RCC 11 Treated Water Tank - II 1 7.15 m X 2.5 m X 3.5 m, SWD RCC 12 Sump Pit 1 1.75 m X 1.0 m X 1.0 m RCC
DESIGN DETAILS for STP – 190 KLD:
A. BAR SCREEN
In the incoming channel, a chamber with bar screen of stainless screen shall be fitted, the purpose of which is to filter out coarse trashy matter from introducing into succeeding units of the treatment plant. Flow to Bar Screen Chamber = 7.92 cum/hr Velocity through Screen = 0.6 m/s Net Area of Screen = 7.92 / (3600 X velocity through screen) = 7.92 / (3600 X 0.6) = 0.0036 m2 Adopting the screen with 5mm (flat) and 10 mm opening Gross area will be = (0.0036 X 5) / 10 = 0.0018 m2 Assuming 50% of clogging = 0.0018 X 2 Screen area will be = 0.0036 m2 TYPE OF SCREEN: Mechanical Screening System, M.S. Epoxy coated inclined bar screen.
B. OIL & GREASE CHAMBER
Flow = 7.92 cum/hr Retention Time = 15 min Volume of the tank to be provided = 1.98 m3
M/s SOBHA LIMITED 95 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
C. EQUALIZATION TANK
Peak flow to the Tank = 7.92 cum/hr Detention Time = 10 hrs Volume of the tank to be provided = 79.2 m3
D. ANOXIC TANK Flow to the Tank = 7.92 cum/hr Detention Time = 2.0 hrs Volume of the tank - I to be provided = 15.84 m3 Volume of the tank - II to be provided = 15.84 m3
E. AERATION TANK
Flow = 7.92 m3/hr Detention Time = 13.0 hrs Volume of the tank to be provided = 102.96 m3
Air Requirement: Flow : 190 cum/ day Inlet BOD : 350 mg/l or 350 g/cum or 0.35 kg/cum BOD Load : 190 cum/d X 0.35 kg/cum Total BOD : 66.5 kg/day
O2 required : 1.8 kg/kg of BOD
Total O2 required : 119.7 kg/day : 4.99 kg/hr Air required : 4.99 kg of Oxygen/ hr 1.2* x 0.232 ** x 0.65 *** x 0.95 **** 0.16 ***** : 181.3 m3/hr
M/s SOBHA LIMITED 96 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Air Requirement in Equalization Tank = 0.015 m3/ min * Volume of EQT = 0.015 * 79.2 m3 = 71.28 m3/hr
Air Requirement in Sludge Holding Tank = 0.015 m3/ min *Volume of SHT = 0.015 m3/min *17.10 m3 = 15.39 m3/hr
F. SECONDARY CLARIFIER TANK
Flow = 7.92 m3/hr Detention time = 4.0 hrs Volume of the tank to be provided = 31.68 m3
G. CLARIFIED WATER TANK
Flow = 7.92 m3/hr Detention time = 7.0 hrs Volume of the tank to be provided = 55.44 m3
H. PRESSURE SAND FILTER
Design Flow = 7.92 m3/hr Velocity of percolation through Filter = 10 m2/ m3/hr Size of PSF = 1.0 m dia X 2.0 m HOS Quantity = 1 No.
I. ACTIVATED CARBON FILTER
Design Flow = 7.92 m3/hr Velocity of percolation through Filter = 10 m2/ m3/hr Size of PSF = 1.0 m dia X 2.0 m HOS Quantity = 1 No.
M/s SOBHA LIMITED 97 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
J. HYPO DOSING Hypo dosing pump = 10 lph Capacity = 200 Lts.
K. SLUDGE HOLDING TANK Sludge Volume = 1 to 2% of Flow = 2 % of 190 m3/day = 3.8 m3/day Detention Time = 4.5 Days Volume of the tank to be provided = 17.10 m3
L. TREATED WATER TANK - 01 Flow = 7.92 m3/hr Detention Time = 5.0 hrs Volume of the tank to be provided = 39.60 m3
M. ULTRA FILTRATION Flow = 57 m3/day Filtration Rate = 3.0 m3/ hr
N. TREATED WATER TANK - 02 Flow = 7.92 m3/hr Detention Time = 12.0 hrs Volume of the tank provided = 95.04 m3
LIST OF CIVIL UNITS
SL. No. Description Qty MOC 1 Bar Screen Chamber 1 RCC
M/s SOBHA LIMITED 98 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
2 Oil & Grease Chamber 1 RCC
3 Equalization Tank 1 RCC
4 Anoxic Zone Tank - I 1 RCC
5 Anoxic Zone Tank - II 1 RCC
6 Aeration Tank 1 RCC
7 Secondary Clarifier Tank 1 RCC
8 Clarified Water Tank 1 RCC
9 Sludge Holding Tank 1 RCC
10 Treated Water Tank – I 1 RCC
11 Treated Water Tank - II 1 RCC
12 Pump room sump pit 1 RCC
M/s SOBHA LIMITED 99 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA STP FLOW DIAGRAM
Sewage Generation
Anoxic Zone Tank BSC
Equalization Aeration Secondary Clarified Tank Tank Clarifier Water Tank Tank Filter Feed Pump
O & G Pressure Sand Filter Sludge Recirculation line Blower Sodium Hypochlorite Dosing System
Sludge Drain line
Sludge Activated Filter Press for Digestion Carbon Filter Sludge Drying Tank Filter Press Feed Pump (Screw Dried Sludge as Pump) Fertilizer to Garden
Treated Water For Flushing OHT Treated Water Ultra Filtration Tank - 02 Tank - 01
Gardening
M/s SOBHA LIMITED 85 ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
STP OF CAPACITY: 1 x 190 KLD AND 1 X 160 KLD
TECHNOLOGY - SBR TECHNOLOGY Sewage Treatment plant is provided for treating all kinds of wastewater generated due to various domestic activities involved in the mall & residential units of the proposed project. This facility is not only installed for conforming to the statutory requirement of Pollution Control Board, but also to ensure that the treated water is utilized for gardening and flushing activities. Sewage Treatment plant – 1 is designed based on the fixed film reactor technology consisting of the following units; 1. Bar screen Chamber 2. Solid separation Tank 3. Equalization Tank 4. Aeration & Settling Tank 5. Clarified water tank 6. Sludge Holding Tank 7. Micron Filtration 8. Treated Water Tank – I 9. Treated Water Tank – II 10. Filter press At this juncture, based on the KSPCB hearing conducted on 12.12.14, we have combined both the Sewage treatment plants,; 1. Combined STP is designed as below;
(A) Solid separation tank 1 & 2 is utilized as Anaerobic Tank.
M/s SOBHA LIMITED 85
ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
(B) Equalization Tank 1 & 2 is utilized for the collection of sewage from both the sewer networks.
(C) Aeration tank designed by Hi-clear is retained to meet the current sewage flow from the projects. After clarified water tank of Hi-clear plant, sewage is pumped to proposed SBR tank for further process.
(D) We are proposing SBR technology for treating the sewage which consists of ; SBR Tank Air blowers for SBR Tank Fine bubble diffusers for SBR tank
(E) The SBR process consists of four cycles and are explained below:
1. FILLING During this sequence, raw sewage is transferred into SBR tank by Submersible Pump and at the same time air is supplied through the air blower. As the water level inside the reactor reaches to the predetermined level the sewage transfer pump is automatically switched off by the level switch controller.
2. AERATION Sewage is mixed and aerated to satisfy the required oxygen demand for oxidation of organic matter present in the sewage. Aeration cycle duration is determined on the basis of the organic load and the pre-set time. Air is supplied through the submerged fine pore diffuser membrane by means of air blower.
3. SETTLING Following aeration, air is shut off and the mixed liquor is allowed to settle. A tranquil condition is created in the reactor for efficient sludge settling. During
M/s SOBHA LIMITED 86
ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
settling time, SBR tank acts as anoxic zone & hence nutrient removal will take place.
4. DECANTATION Once settling time is over, the filter feed pump will be switched on and filtration takes place.
(F) From SBR tank, the treated sewage is pumped to Pressure Sand Filter & Activated Carbon Filter and stored in treated water tank. Treated water after filtration will be used for landscaping.
(G) From treated water tank, further treated by Ultrafiltration technology. It removes the fouling materials like particulate matter, suspended solids, bacteria and viruses, colloidal materials (non-reactive silica, iron, aluminium, slit etc.,), high molecular weight organic compounds. Ultrafiltration is to treat the filtered water at a recovery of 90-95%. This is collected in Treated Water Tank –II which is used for flushing.
(H) Sludge Holding Tank 1 & 2 will be retained and utilized for storing the excess sludge generated, sludge will be treated in filter press and utilized as manure after treating with OWC.
DESIGN DETAILS: 190 KLD A. BAR SCREEN CHAMBER - I Flow to Bar Screen Chamber = 7.92 cum/hr Velocity through Screen = 0.6 m/s Net Area of Screen = Q / (3600 X velocity through screen) = 7.92 / (3600 X 0.6) = 0.0037 m2 /hr
Adopting the screen with 5mm (flat) and 10 mm opening
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Gross area will be = (0.0037 X 5) / 10 = 0.0019 m2 Assuming 50% of clogging = 0.0019 X 2 Screen area will be = 0.0038 m2 Dimension of the Tank to be provided = 3.0 m x 1.0 m x 1.75 m (h)
TYPE OF SCREEN: Mechanical Screening System, M.S. Epoxy coated inclined bar screen.
B. ANAEROBIC TANK - I Flow = 7.92 cum/hr Detention Time = 8 hrs Peak Flow = 7.92 m3/hr X 8 hrs = 63.36 m3 Actual volume of the tank to be provided = 68.06 m3 Dimension of the Tank to be provided = 8.3 m X 5.125 m X 1.6 m (SWD)
C. EQUALIZATION TANK - I Flow = 7.92 cum/hr Detention Time = 8 hrs Peak Flow = 7.92 m3/hr X 8 hrs = 63.36 m3
Actual volume of the tank to be provided = 68.06 m3 Dimension of the Tank to be provided = 8.3 m X 5.125 m X 1.6 m (SWD)
DESIGN DETAILS: 160 KLD A. BAR SCREEN CHAMBER – II
Flow to Bar Screen Chamber = 6.67 cum/hr Velocity through Screen = 0.6 m/s
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Net Area of Screen = Q / (3600 X velocity through screen) = 6.67 / (3600 X 0.6) = 0.0031 m2 /hr
Adopting the screen with 5mm (flat) and 10 mm opening Gross area will be = (0.0031 X 5) / 10 = 0.0015 m2 Assuming 50% of clogging = 0.0015 X 2 Screen area will be = 0.0031 m2 Dimension of the Tank to be provided = 3.0 m x 1.0 m x 1.75 m (h) TYPE OF SCREEN: Mechanical Screening System, M.S. Epoxy coated inclined bar screen.
B. ANAEROBIC TANK - II Flow to the Chamber = 6.67 cum/hr Detention Time = 6 hrs Peak Flow = 6.67 m3/hr X 6 hrs = 40.02 m3 Actual volume of the tank to be provided = 42.496 m3 Dimension of the Tank to be provided = 8.3 m X 3.2 m X 1.6 m (SWD)
C. EQUALIZATION TANK - II Flow = 6.67 cum/hr Detention Time = 6 hrs Peak Flow = 6.67 m3/hr X 6 hrs = 40.02 m3 Actual volume of the tank to be provided = 42.496 m3 Dimension of the Tank to be provided = 8.3 m X 3.2 m X 1.6 m (SWD)
COMMON TANKS FOR 190 KLD AND 160 KLD: A. SBR TANK
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Aeration Time = 15 hours including filling time of 4 hrs Settling = 2 hrs Decantation = 7 hrs No. of Batches = 2 Nos. SBR tank volume = 350 X 350 3000 X 0.1 = 408 m3 From SBR tank, only 60% of the tank volume can be decanted, hence actual tank volume of the SBR = 408 X 1.4 = 571.2 m3 Actual volume of the SBR tank provided = 580 m3
1. RAW SEWAGE TRANSFER PUMP Raw sewage has to be pumped in 4hrs to SBR tank Total sewage flow = 350 m3/day No. of pumping hrs = 4 hrs Pump Capacity = 350 / 4 = 87.5 m3/hr
2. AIR BLOWER FOR SBR TANK Flow : 350 m3/ day Inlet BOD : 350 mg/l or 0.35 kg/cum BOD Load : 350 cum/d X 0.35 kg/cum Total BOD : 122.5 kg/day O2 required : 2.0 kg/kg of BOD Total O2 required : 245 kg/day Total Number of Hrs considered : 15 hrs : 16.332 kg/hr
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Air required : 16.332 kg of Oxygen/ hr 1.2* x 0.232 ** x 0.65 *** x 0.95 **** 0.23 ***** * = Density of Air ** = Percentage of Oxygen in air by weight *** = Alpha factor **** = Beta factor ***** = Oxygen transfer efficiency. Capacity of the twin lobe air blower required = 413 m3/hr
B. FILTRATION SYSTEM Decantation time = 7 hrs Total flow = 350 m3/day Capacity of the Filter feed pump = 350 / 7 = 50 m3/hr
1. PRESSURE SAND FILTER Filtration rate = 15 m3/hr/m2 Area = 50/15 = 3.33 m2 Diameter of the PSF = 2.06m Diameter of the PSF provided = 2.2m dia X 2.0 m HOS
2. ACTIVATED CARBON FILTER Filtration rate = 13 m3/hr/m2 Area = 50/13 = 3.84 m2 Diameter of the ACF = 2.2 m Diameter of the ACF provided = 2.2m dia X 2.0 m HOS
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
C.TREATED WATER TANK – I Flow = 14.58 m3/hr Detention Time = 4 hrs Volume of the Tank = 58.32 m3 Actual volume of the tank to be provided = 68.04 m3 Dimension of the tank provided = 2.4 m X 10.5 m X 2.7 m, (SWD)
D. HYPO DOSING Hypo dosing pump = 0 - 15 lph x 1 No. Capacity = 200 Lts X 1 No.
E. 1. SLUDGE HOLDING TANK - I Sludge Volume = 1 to 2% of Flow = 2 % of 190m3/day = 3.8m3/day
Detention Time = 7 Days Volume of the tank = 26.6 m3 Actual volume of the tank to be provided = 26.73 m3 Dimension of the tank to be provided = 3.3 m X 2.7 m X 3.0 m, (SWD)
2. SLUDGE HOLDING TANK - II Sludge Volume = 1 to 2% of Flow = 2 % of 160m3/day = 3.2m3/day Detention Time = 6 Days Volume of the tank = 19.2 m3 Actual volume of the tank to be provided = 20.79 m3 Dimension of the tank to be provided = 3.3 m X 2.1 m X 3.0 m, (SWD)
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
F. ULTRA FILTRATION Duration of operation = 20 hrs Capacity = 6 m3/hr
G. TREATED WATER TANK - II Flow = 14.58 m3/hr Detention Time = 3 hrs Volume of the Tank = 43.74 m3 Actual volume of the tank to be provided = 43.09 m3 Dimension of the tank provided = 2.4 m X 6.65 m X 2.7 m, (SWD)
RAIN WATER HARVESTING
The rain water is harvested through an artificial lake provided within the project site. The harvested water is used to meet the domestic water demand post treatment.
Lake volume calculations are shown below:
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
PARKING FACILITIES
Adequate provision will be made for car/vehicle parking at the project site. Parking details are provided below: PARKING PROPOSED: S. No Particulars (As per accorded As per Revision. EC) 1 Cars 3631 1417 2 Two wheelers 780 550 3 Visitor car parking 84 60 Total parking Proposed 2027
POWER REQUIREMENT
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
The power is being supplied by Kerala PTCL (Kerala Power Transmission Corporation Limited). The total revision and electrical load for the project will be approx. 9 MVA for the project.
(As per As per Revision
accorded EC) MVA Power MVA requirement 24.49 MVA 9 MVA
Details of D.G Sets There is provision of DG sets power back up during the project failure. The 20 DG sets capacities provided are 1 x 50 kVA +1 x 125 kVA + 2 x 180 kVA +1 x 320 KVA +4 x 380 kVA +8x 500 kVA +3 x 1010 kVA. The DG sets will be equipped with acoustic enclosure to minimize noise generation and adequate stack height for proper dispersion.
SOLID WASTE GENERATION Solid waste would be generated both during the construction as well as operation phase. The solid waste expected to be generated during the construction phase will comprise of excavated materials, used bags, bricks, concrete, MS rods, tiles, wood etc. The following steps are proposed to be followed for the management solid waste: Construction yards are proposed for storage of construction materials. The excavated material such as topsoil and stones will be stacked for reuse during later stages of construction Excavated top soil will be stored in temporary constructed soil bank and will be reused for landscaping of the group housing project. Remaining soil shall be utilized for refilling / road work / rising of site level at locations/ selling to outside agency for construction of roads etc.
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Solid Waste
Construction Waste
Construction Empty waste, Cement Excavated Broken Bricks, Bags Soil Waste Plaster
Sold to Used in re-filling, agency for Top soil raising site level recycling conserved for landscaping, balance used in re-filling Figure 4: Solid Waste Management Scheme (Construction Phase)
During the operation phase, waste will comprise domestic as well as horticultural waste. The solid waste generated from the project shall be approx. 2774.14 kg per day (@ 0.5 kg per capita per day for residents, @ 0.15 kg per capita per day for the visitor, 0.25 kg per capita per day for the staff members and landscape waste @ 0.12 kg/acre/day). Following arrangements will be made at the site in accordance to Municipal Solid Waste (Management and Handling) Rules, 2000 and amended Rules, 2016:
Table 9: Comparative Solid waste Generation Details Existing (As per As per Proposed
accorded EC) Kg/day Solid Waste Kgs/day Management 6200 2774.14
Table 10: Calculation of Solid Waste Generation
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
S. No. Description Occupancy Waste Generated Waste Generated (kg/capita/day) (kg/day)
1. Domestic Solid Waste A. Residential 3600 0.5 1800 apartments B. Villas 125 0.5 62.5 C. Plots 155 0.5 77.5 D. Staff 310 0.25 77.5 (Maintenance, Club, Commercial) E. Visitors 4920 0.15 738 2. Horticultural @ 0.2 kg/acre/day 3.5 Waste (17.4 acre) 3. STP Sludge Sludge generated 15.14 x 0 .35 x B.O.D difference/1000 Total Solid Waste Generation = 2,774.14 kg/day
Total solid waste generated = 2774.14 kg/day Total organic waste (60% of total solid waste) = 1664.484 kg/day Total in-organic waste (40% of total solid waste) = 1109.656 kg/day
Collection and Segregation of waste 1. A door to door collection system will be provided for collection of domestic waste in colored bins from household units. 2. The local vendors will be hired to provide separate colored bins for dry recyclable and Bio-Degradable waste. 3. For commercial waste collection, adequate number of colored bins (Green and Blue & dark grey bins– separate for Bio-degradable and Non Bio-degradable) are proposed to be provided at the strategic locations of the commercial area. 4. Litter bin will also be provided in open areas like parks etc.
Treatment of waste
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
Bio-Degradable waste 1. Bio-degradable waste will be subjected to composting by organic waste converter and
the compost will be used as manure. 2. STP sludge is proposed to be used for horticultural purposes as manure. 3. Horticultural Waste is proposed to be composted and will be used for gardening purposes. Recyclable wastes i. Grass Recycling – The cropped grass will be spread on the green area. It will act as manure after decomposition. ii. Recyclable wastes like paper, plastic, metals etc. will be sold off to recyclers.
Disposal Recyclable and non-recyclable waste will be disposed through a local agency. Solid waste management scheme is depicted in the following figure:
Figure 5: Solid Waste Management Scheme (Operation Phase)
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
GREEN AREA
Total green area measures 70,514.25 sqm (Shelter belt, Avenue plantation and lawn).
DETAIL OF CONSTRUCTION MATERIAL
List of building materials being used at site: 1. Coarse sand 2. Fine sand 3. Stone aggregate 4. Stone for masonry work 5. Cement 6. Reinforcement steel 7. Pipe scaffolding (cup lock system) 8. Bricks 9. CLC fly ash blocks 10. Crazy (white marble) in grey cement 11. P.V.C. conduit 12. MDS, MCBs 13. PVC overhead water tanks 14. paver tiles 15. PPR (ISI marked) 16. PVC sullage lines 17. S.W. sewer line up to main sewer 18. PVC rain water down take 19. Stainless steel sink in kitchen 20. Joinery hardware- ISI marked
MATERIALS USED FOR CONSTRUCTION & THEIR U VALUE
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ENVIRONMENTAL CLEARANCE FOR INTEGRATED COMPLEX “SOBHA CITY” AT PUZHAKKAL, CONCEPTUAL PLAN GURUVAYYUR ROAD, DISTRICT THRISSUR, KERALA
LIST OF MACHINERY USED DURING CONSTRUCTION
(i) Dumper (ii) Concrete mixer with hopper (iii) Heavy moving earth equipment’s.
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