Executive Summary 1 Introduction Tanjung Pinang Development (TPD) Sdn. Bhd. is currently undertaking a land reclamation project called Seri Tanjung Pinang Phase 2 (STP2) following its Detailed Environmental Impact Assessment (DEIA) approval. STP2 is planned to be located adjacent to the existing Seri Tanjung Pinang Phase 1 (STP1) at Tanjung Tokong, Penang. One of the components of STP2’s top side development that TPD wishes to pursue is the construction of a green wastewater treatment plant (gWTP). This report shall address the EIA study on the Proposed Construction of Green Wastewater Treatment Plant (gWTP). 2 Project Background Seri Tanjung Pinang as a whole is a development of a new township. STP1 with an acreage of 240 acres of headland adopted the concept of a waterfront lifestyle. STP2 on the other hand will offer an island waterfront community with 760 acres of land. STP2 shall comprise of a combination sumptuous residences with commercial facilities. Consequently, a study was done by Jurutera TSSC Lim Sdn. Bhd. to evaluate the sewerage system of the existing STP1 and to-be-reclaimed land STP2. The study became the pioneer of the proposed Green Wastewater Treatment Plant (gWTP) that will be able to accommodate 180,000 population Environmental Impact Assessment ES-1 Dr. Nik & Associates Sdn. Bhd. equivalent (PE). The construction and design of the gWTP shall be taken up by Uniti Consultans Sdn. Bhd; under the guidelines and advice from related authorities. 3 Project Proponent and Consultant The Project Proponent is Tanjung Pinang Development Sdn. Bhd. (a subsidiary of Eastern and Oriental Berhad). The consultant appointed to conduct this Environmental Impact Assessment (EIA) study is Dr. Nik & Associates Sdn. Bhd. 4 Statement of Need The sewage generation rate projected from STP2 development is expected to be 40,500 m3/day which is equivalent to the flow rate of ten large petrochemical plants. This signifies the potential negative implication of the sewage flow if it is not properly taken care of. A gWTP built on site was opted against the alternative plan which is to direct the sewage from STP2 to Jelutong Wastewater Treatment Plant due to its lack of feasibility i.e. energy and cost. Moreover, the proposed gWTP will be able to produce recycled water and bio-fertilizer as a byproduct that can cater the demands from Penang Island and Prai. In addition, the green technology concept reduces the energy footprint of the treatment plant as it only requires 5 acres of land instead of the allocated 16 acres originally. 5 Project Description 5.1 Project Location The proposed gWTP with an area of 5 acres will be constructed at the south region of to-be-reclaimed island STP2. STP2 is situated within a 7 km bay north of Penang Straits along the coastline between Tanjung Tokong and Gurney Drive. Prominent suburbs nearby the Proposed Project are Gurney Drive, Bagan Jermal and Tanjung Bungah. Figure E1 shows STP2’s general layout and the location of the Proposed Project situated on STP2. ES-2 Environmental Impact Assessment Dr. Nik & Associates Sdn. Bhd. executive summary The Proposed Construction of Green Wastewater Treatment Plant (gWTP) at STP2, Penang Proposed Project Location Discharge outlet into the canal Figure E1 l Location of Proposed Green Wastewater Treatment Plant (gWTP) in the STP2 Masterplan Environmental Impact Assessment ES-3 Dr. Nik & Associates Sdn. Bhd. 5.2 General Site Description The nearest urban settlement is approximately 1 km from the Proposed Project area which is Seri Tanjung Pinang Phase 1 (STP1). STP1 generally comprises of mixed development area. Since STP2 is yet to be reclaimed, the immediate surrounding area of the proposed project site is only the sea. Based on STP2 master layout plan, the gWTP is located near a designated commercial and affordable housing area. Tanjung Tokong is considered a dense housing area for the low to middle income population. Apart from Tanjung Tokong, Gurney Drive is the most prominent area located near the proposed site. STP2 is planned to be a sustainable development that is able to support the needs of the Penang community and its environment. 5.3 Project Concept The principle adopted in the gWTP is “Sewage to Resources”, where the sewage treated is able recover renewable resources i.e. water and bio- fertiliser which are in high demand by Penang and Prai. The gWTP is designed to produce effluent with BOD of 8 mg/l with other major parameters that meet Class II water of the National Water Quality Standard (NWQS). Table E1 is a comparison of the designed effluent quality with Standard A of Second Schedule of Environmental Quality (Sewage Effluent) Regulations 2009. Table E1 l Designed Effluent Quality Standard A Class II Parameters (units) EQR 2009 gWTP Effluent (NWQS) (Sewage Effluent) Ammoniacal Nitrogen/AN NS 0.3 0.3 (mg/L) BOD5 (mg/L) 20 8 3 COD (mg/L) 50 25 25 DO (mg/l) NS 5 – 7 5—7 pH 6 - 9 6 – 9 6—9 Colour (TCU) NS 150 150 Floatables NS N N Odour NS N N Taste NS N N Total SS (mg/L) 50 50 50 Turbidity (NTU) NS 50 50 E. coli (counts/100ml) NS 400 400 Note: NS = Not Stated; N = Non-detectable ES-4 Environmental Impact Assessment Dr. Nik & Associates Sdn. Bhd. executive summary The Proposed Construction of Green Wastewater Treatment Plant (gWTP) at STP2, Penang 5.4 Project Components The green wastewater treatment plant has four modules with each module is able to cater for 45,000 PE, which is a total of 180,000 PE. The components of 3 3 the gWTP will bePL 0.00mcovered with most structures concealed under grass PRESSURE FILTER covered slopes. The components of the gWTP are shown in Figure E2. 2 ASP SECONDARY CLARIFIER AERATION TANK MEDIA TANK POLISHING 1 PRIMARY CLARIFIER PL 0.00m AINLET 3 3 PRESSURE FILTER I E D ASP PLAN VIEW SECONDARY CLARIFIER AERATION TANK MEDIA TANK POLISHING B F C G & G REMOVAL PRIMARY CLARIFIER SECTION 1-1 THICKENER GSLUDGE T MEDIA TANK POLISHING RECYCABLE WATER F E C TANK PRIMARY CLARIFIER SECONDARY CLARIFIER SECTION 2-2 D PRESSURE I ASP FILTER AERATION TANK RL 2.00m U CHLORINATOR PHYTOPOLISHING CANAL PRESSURE J FILTER I ESECONDARY D CLARIFIER ASP AERATION TANK ANAEROBIC MEDIA TANK MEDIA DIGESTER POLISHING F C PRIMARY CLARIFIER H UNIT DEWATERING N BIO GAS SLUDGE SCRUBBER COMPOSTER THICKENER GSLUDGE PL 0.00m GAS STORAGE O GAS MEDIA TANK R ENGINE P POLISHING F E C PRIMARY CLARIFIER 5 5 SECONDARY CLARIFIER RECYCABLE WATER TANK D PRESSURE I ASP FILTER AERATION TANK RL 2.00m Notation A. Intake works with coarse screen & inlet pumps M. Digester tanks with media EMM & Gas PL 0.00m RECYCABLE WATER B. Front end screens & GG removal storage cover - (not visible) TANK C. Primary Clarifier cum equalisation N. Biogas bioscrubber system SECTION 5-5 D. Media 3D contact aeration tank O. Biogas storage E. Secondary clarifier P. Biogas engine F. Media 3D polishing tank Q. Digestate settler & separator with media & G. Sludge thickener and sludge conditioning unit aeration - (not visible) H. Sludge dewatering unit R. Dewatered sludge rotary composter (with I. Rapid sand pressure filter heating using hot flue gases) J. Partial Chlorination works S. Sludge maturing boxes - (not visible) K. Biodeodoriser & blowers (located on 1st floor) T. Water storage tank - (not visible) U. Outlet to perimeter drain going to canal L. Biofilter channel & pond with media bed and phytoraft - (not visible) Figure E2 l The gWTP Layout and List of Units Environmental Impact Assessment ES-5 Dr. Nik & Associates Sdn. Bhd. 5.5 Project Activities The main activities of the Proposed Project involves the following: i) Pre-construction activities: Survey works. ii) Construction activities: Temporary drainages, roads and infrastructures works; and Green Wastewater Treatment Plant (gWTP) construction. iii) Operation stage. The construction of the gWTP shall be on a bare patch of land on the fully reclaimed island STP2. Temporary drainages, roads and infrastructure works will be constructed to enable the gWTP to be build. The construction of the gWTP will be executed in four (4) phases which starts with piling and foundation works. The treatment plant will also be constructed a total sunken depth of 4 m. The main units operations and process flow of the proposed project are visualized in Figure E3. Figure E3 l Green WTP Configuration Showing Main Unit Operations ES-6 Environmental Impact Assessment Dr. Nik & Associates Sdn. Bhd. executive summary The Proposed Construction of Green Wastewater Treatment Plant (gWTP) at STP2, Penang The gWTP exhibits similar processes as the conventional activated sludge (ASP). The prominent difference is sludge is removed at the earliest opportunity within the gWTP process. 5.6 Project Implementation Schedule The proposed gWTP will be implemented in four phases. The biogas system will be operated in the 6th year prior to sludge disposal facility being approved. All the four modules is expected to be operating in 7 years upon the commencement of the project. 6 Existing Environment 6.1 Physical Environment 6.1.1 Water Quality 6.1.1.1 Ebbing and Flooding Baseline Sampling Results Figure E4 shows the location of the water quality sampling stations with a total of 11 sampling stations selected. Generally the ambient water quality at north-west and southern area of the project area showed good water quality. WQ1 - WQ4 showed slightly higher readings compared to WQ6 - WQ10. BOD and TOC values remained less than 7 mg/L and 1 mg/L except for a few occasional increments. Other parameters’ readings i.e. NH3-N, NO3-N, E. coli, TSS, O&G and P remained low and deemed undetected.