Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
ELECTRICAL AND MECHANICAL PROJECTS DIVISION
PROJECT PROFILE
WATER RECLAMATION FACILITY IN TAI PO SEWAGE TREATMENT WORKS
Page 1 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
Table of Content
1 PROJECT INFORMATION ...... 3 1.1 Project Title ...... 3 1.2 Purpose and Nature of Project ...... 3 1.3 Name of Project Proponent ...... 3 1.4 Location and Scale of Project ...... 3 1.5 Number and Types of Designated Project to be Covered by this Project Profile ...... 4 1.6 Name and Telephone Number of Contact Person ...... 4 2 OUTLINE OF PLANNING AND IMPLEMENTATION PROGRAMME ...... 4 3 MAJOR ELEMENTS OF THE SURROUNDING ENVIRONMENT ...... 5 3.1 Major Elements of Surrounding Environment ...... 5 3.2 Existing and Planned Sensitive Receivers ...... 5 4 POSSIBLE IMPACTS ON THE ENVIRONMENT ...... 5 4.1 Possible Environmental Impacts during Construction Stage ...... 5 4.2 Possible Environmental Impacts during Operation Stage ...... 6 5 ENVIRONMENTAL PROTECTION MEAUSRES TO BE INCORPORATED ...... 8 5.1 Environmental Protection Measures during Construction Stage ...... 8 5.2 Environmental Protection Measures during Operation Stage ...... 9 5.3 Comments on Environmental Effects ...... 9 6 USE OF PREVIOUSLY APPROVED EIA REPORTS ...... 9 7 SUMMARY OF POTENTIAL ENVIRONMENTAL IMPACTS AND MIGITATION MEASURES ...... 10
Page 2 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
1 PROJECT INFORMATION 1.1 Project Title Water Reclamation Facility in Tai Po Sewage Treatment Works.
1.2 Purpose and Nature of Project The Project will involve the installation of water reclamation facility (hereinafter called “ Facility”) in Tai Po Sewage Treatment Works (TPSTW). The water reclamation facility includes a membrane filtration plant (hereinafter called “MF Plant”) and a reverse osmosis plant (hereinafter called “RO Plant”). The MF Plant will be able to advance treat the secondary effluent after secondary treatment at sewage treatment works for the production of reclaimed water for ground and facility washing and toilet flushing. Part of the effluent from the MF Plant will be further polished in the downstream RO Plant so that reclaimed water will be produced for polymer preparation and landscape irrigation. All the reclaimed water produced will be used within the plant boundary of Drainage Services Department (DSD). Potable water consumption of the sewage treatment works can then be reduced with the operation of the water reclamation facility and contributes to a green and sustainable environment.
The maximum design flow of the water reclamation facilities for ground and facility washing, toilet flushing, polymer preparation and landscape irrigation are summarized as follows :
No. Plant Location Ground and Facility Polymer Landscape No. of Water Washing and Toilet Preparation Irrigation (m3/day) Reclamation Flushing (m3/day) Facility (m3/day) 1 Tai Po STW 300 300 50 1
1.3 Name of Project Proponent Drainage Services Department (DSD).
1.4 Location and Scale of Project The Facilities (the MF Plant and the RO Plant) will be installed within the plant boundaries of TPSTW as shown in Figures 1 & 2. The Facility will occupy a footprint of about 300m2. The height of the Facility will be about 5 m and all associated tanks in the Facility will be covered for safety purpose and to minimize odour emission, if any. The water distribution pipeline in each site will be less than 100mm in diameter in size of about 500m long.
Page 3 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
The following shows the process train of the advanced treatment :
SECONDARY EFFLUENT AFTER SECONDARY TREATMENT AT SEWAGE TREATMENT WORKS
CHLORINE RECLAIMED WATER FOR GROUND MF RESIDUAL AND FACILITY WASHING AND DISINFECTION TOILET FLUSHING
CONCENTRATE CONNECTED TO RO SEWAGE COLLECTION POINT OF THE TREATMENT WORKS
RECLAIMED WATER FOR POLYMER PREPARATION
CHLORINE RESIDUAL DISINFECTION
RECLAIMED WATER FOR LANDSCAPE IRRIGATION
PROCESS TRAIN OF ADVANCED TREATMENT
The Facility is scheduled to operate in January 2013. The Facility (the MF Plant and the RO Plant) will operate automatically on a 24 hours per day.
1.5 Number and Types of Designated Project to be Covered by this Project Profile The use of reclaimed water from the MF Plant and RO Plant within the existing DSD plant boundary for ground and facility washing, toilet flushing, polymer preparation and landscape irrigation is identified as a Designated Project in accordance with F.4 (An activity for the reuse of treated sewage effluent from a treatment plant) of Schedule 2 of the Environmental Impact Assessment Ordinance (EIAO).
1.6 Name and Telephone Number of Contact Person Mr. LIU Hon-wa, Senior Engineer/Electrical and Mechanical Projects Division, Drainage Services Department (Tel. 2594 7303)
2 OUTLINE OF PLANNING AND IMPLEMENTATION PROGRAMME
DSD will carry out the design of the proposed reclaimed water facility. DSD will also supervise the construction and operation of the whole scheme.
It is anticipated that the tender and construction of the works will commence in September 2011 and January 2012 respectively for completion of the construction works by January 2013. Operation of the scheme will take place after the installation of the reclaimed water facility in January 2013.
Page 4 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
3 MAJOR ELEMENTS OF THE SURROUNDING ENVIRONMENT 3.1 Major Elements of Surrounding Environment
The water reclamation facility and distribution system will be located within the boundary of TPSTW (Figure 2). There are some industrial buildings in the south, west and north side. The east side is Tai Po Shuen Wan Temporary Golf Driving Range.
3.2 Existing and Planned Sensitive Receivers
3.2.1 Air Quality and Noise
As shown in Figure 2, Tai Po Shuen Wan Temporary Golf Driving Range in the east side, Taclon Industries Ltd. and Hung Hing Offset Printing Centre in the south side, Cabot Plastics and a planned commercial building in the west side and Watson’s Water Centre and HK Yakult Co. Ltd. and Rainbow Latex Ltd. in the north side are identified as the sensitive receivers during the construction and operation stages.
3.2.2 Water Quality
Tolo Harbour at the southeast side is identified as the sensitive receiver during the construction and the operation stages.
3.2.3 Health and Hygiene
The occupants of the sewage treatment works including plant staff and visitors are identified as the sensitive receivers during the operation phase.
4 POSSIBLE IMPACTS ON THE ENVIRONMENT 4.1 Possible Environmental Impacts during Construction Stage 4.1.1 Air Quality
The major potential air quality impact during construction of this Project is dust arising from general construction activities.
4.1.2 Noise
The construction activities involved in this Project will include very minor scale excavation and general E&M installation works. Sources of noise during the construction stage would be associated with the use of conventional construction plants and equipment.
4.1.3 Water Quality
Water quality impacts of the Project would be associated with the site runoff and wastewater generated from construction activities. In view of the small scale of the Project, adverse water quality impact during the construction stage is not anticipated.
4.1.4 Waste
Excavation of very minor scale will be required for the construction pipework distribution system. The volume of excavated material generated during construction for
Page 5 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
each reclamation facility would be about 10 m3. Other C&D waste from the formwork and temporary works, and minor chemical waste and general refuse, will also be generated.
4.1.5 Ecology
The MF Plant, the RO Plant and the associated distribution pipework system would be located within DSD plant boundary. No adverse ecological impact is anticipated during the construction stage.
4.1.6 Landscape and Visual
The MF Plant, the RO Plant and pipework distribution system would be located within DSD plant boundary. No tree felling is expected for this Project. The landscape and visual impact arising from the Project is negligible due to the small scale of the project.
4.1.7 Health and Hygiene
Adverse impacts on health and hygiene are not anticipated during the construction stage.
4.2 Possible Environmental Impacts during Operation Stage
4.2.1 Natural Resources
Currently, DSD sewage treatment works utilize potable water for ground and facility washing,, polymer preparation and landscape irrigation. The use of reclaimed water under the Project will reduce the potable water demand of DSD sewage treatment works. It is anticipated that approximately 650 m3 of potable water will be saved per day due to the proposed Project.
4.2.2 Air Quality
Chlorination tank will be enclosed to contain any potential odour emission. Adverse odour impact on the air sensitive receivers during the operation stage of the Project is not expected.
4.2.3 Noise
The pumps of the Facility will be the main potential noise sources during the operation stage of the Project. The noise will arise from the pumps, which are located about 100m from the building of Taclon Industries. In view of the small scale of the works, adverse noise impact is minimal during the operation stage of the Project.
4.2.4 Water Quality
During the operation stage, the reclaimed water from the MF Plant and the RO Plant will undergo chlorination process by dosing of sodium hypochlorite to maintain a specific residual chlorine level of the reclaimed water for ground and facility washing, toilet flushing and landscape irrigation. The quality of the reclaimed water is summarized in Table 1.
Page 6 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
Table 1 –Reclaimed Water Quality
Water Quality Unit USEPA Criteria* Reclaimed Water Quality of this Project Parameter Washing Toilet Irrigation Chemical Make-up Ground and Toilet Polymer Landscape Flushing Water Facility Flushing Preparation Irrigation Washing pH - N.S. 6-9 6-9 6.2-8.3 6-9 6-9 6-9 6.2-8.3 6-9 Colour HU N.S. N.S. N.S. 20 N.S. N.S. < 20 < 20 N.S. Turbidity NTU N.S. ≦ 2 ≦ 2 N.S. ≦ 2 ≦ 2 ≦ 2 ≦ 2 ≦ 2 Total Suspended mg/L ≦ 30 N.S. N.S. 5 ≦ 10 ≦ 10 ≦ 10 ≦ 5 ≦ 10 Solids (TSS)
Biochemical mg/L ≦30 ≦ 10 ≦ 10 N.S. ≦ 20 ≦ 20 ≦ 10 ≦ 10 ≦ 10 Oxygen Demand (BOD5) E.Coli No./100 ≦ 200 Not Not N.S. Not Detectable Not Detectable Not Not Detectable Not Detectable mL fecal coli Detectable Detectable Detectable Total Residual mg/L ≧ 1 ≧ 1 ≦ 1 N.S. ≧ 1 ≧ 1 ≧ 1 N.S. ≦ 1 Chlorine (TRC) Total Dissolved mg/L N.S. N.S. N.S. 1,000 N.S. N.S. N.S. < 500 <500 Solids (TDS)
Remarks: N. S. – Not Specified * From USEPA (2004) Guidelines for Water Reuse
The reclaimed water of this Project will have an overall better water quality than the USEPA criteria currently in use for landscape irrigation and non-potable usages. No water quality impacts are predicted during normal operation of the Facility.
4.2.5 Waste
The concentrate from the MF Plant and the RO Plant will be collected and diverted to the sewage collection point of the sewage treatment works. Waste impact is not anticipated during the operation stage.
4.2.6 Ecology
No ecological impact is expected during the operation of the Facility.
4.2.7 Health and Hygiene
Ground and facility washing, toilet flushing, polymer preparation and landscape irrigation are non-potable uses. The reclaimed water from the RO Plant will be directly fed into the polymer preparation tank. Direct contact by human being is not expected. All other reclaimed water from the MF Plant and the RO Plant will be treated with chlorination prior to use or for storage. Its impact on human health and hygiene is therefore minimal. In addition, for ground and facility washing and landscape irrigation applications, operators will be required to wear personal protective gears to minimize contact with the reclaimed water whilst carrying out the washing/irrigation work. However, potential health and hygiene concerns may still exist if there is incorrect connection of the potable and reclaimed water pipes.
4.2.8 Hazard to Life
Small amounts of chemicals will be used for the Facility : 10% solution of sodium hypochlorite for chlorination process (250L) and a 10% solution of sodium bisulphite (250L) required for dechlorination process. The amount of chemicals required is far less than that planned to be stored in the future Stonecutters Island Sewage Treatment
Page 7 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
Works for the operation of the disinfection facilities in the Harbour Area Treatment Scheme (HATS), storage of which has been concluded to present an “acceptable” risk in the quantitative risk assessment of the approved EIA report (AEIAR – 121/2008). Sodium hypochlorite is classified as a Category 4 poisonous substance and sodium bisulphite is classified as a Category 3 corrosive substance under the Dangerous Goods Ordinance (Cap 295). They are not acutely toxic, flammable, or explosive substances, but hazardous gas would be generated if they were accidentally mixed with incompatible chemicals. In fact, if sodium hypochlorite mixes with sodium bisulphite, only heat, but not toxic gas, would be evolved. Also, the use of these chemicals in the Facility would not constitute a potentially hazardous installation in accordance with EPD’s ProPECC PN 2/94 Potentially Hazardous Installation. As such, no hazard impact is anticipated from the Facility.
4.2.9 Landscape and Visual
The Facility and the pipework distribution system will be located within DSD plant boundary. In view of the small scale of the works, the impact arising from the Project is negligible.
5 ENVIRONMENTAL PROTECTION MEAUSRES TO BE INCORPORATED 5.1 Environmental Protection Measures during Construction Stage 5.1.1 Air Quality
In view of the small scale of the Facility, the effect of dust generation from the construction works is expected to be insignificant with the implementation of mitigation measures. The impact will be minimized by the adoption of proper working methods, e.g. regular water spraying.
5.1.2 Noise
The construction activities of the Project will include very minor site excavation and general E&M installation works. Only minor noise impacts will be anticipated. Implementation of good site practices e.g. regular maintenance of powered mechanical equipment and use of silent equipment as the proper noise control measures during the construction stage are recommended to minimize the potential noise impacts.
5.1.3 Water Quality
Adoption of the practices as outline in ProPECC PN 1/94 Construction Site Drainage to minimize site runoff and potential water pollution is recommended, e.g. silt removal facility at nearby stormwater drains on-site before commencement of the excavation. Implementation of good site arrangement and management practice is required. In view of the small scale of the Project, adverse water quality impact during construction stage will not be anticipated.
5.1.4 Waste
The volume of excavated materials generated from the construction of each water reclamation facility would be about 200m3 and most of it could be reused on-site. Other construction and demolition waste, and minor quantity of chemical waste and general refuse generated will be properly disposed. With proper mitigation measures in place, there will be no adverse waste impact anticipated.
Page 8 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
5.2 Environmental Protection Measures during Operation Stage
5.2.1 Noise
The pumps of the Facility will be enclosed to contain the noise emissions. Silenced ventilation system incorporating silencers at the air intakes and discharge openings of the Facility will also be employed to further reduce the noise impact. With these mitigation measures in place, adverse noise impact is not anticipated during the operation stage of the Project.
5.2.2 Water Quality
The pipework arrangement of the Facility is so designed and made that in case complete failure of the Facility, seawater for toilet flushing and potable water for polymer preparation and landscape irrigation will be resumed by simply opening and closing of corresponding isolation valves. With these measures incorporated into the design of the Facility, adverse water quality impact is not anticipated during the operation stage of the Project.
5.2.3 Health and Hygiene
The reclaimed water pipeline will be a separate system and will not be connected with the potable water pipeline system. To avoid cross-connection of the reclaimed water supply to the potable water supply, the pipes for the reclaimed water will be specially arranged to differentiate them from that of the potable water pipes, e.g. clearly labeled with warning signs and notices, colour-coded, and/or using different pipe size, so that physical connection of the reclaimed water pipes with the potable water fittings would not be possible.
5.3 Comments on Environmental Effects The reclaimed water for ground and facility washing, polymer preparation and landscape irrigation will reduce the quantity of potable water consumed in the existing DSD sewage treatment works. This is considered to be the benefits or positive impacts of the Project. The promotion of the use of reclaimed water in appropriate circumstances to enable conservation of potable water will contribute to a green and sustainable environment in Hong Kong.
6 USE OF PREVIOUSLY APPROVED EIA REPORTS
There is no previous approved report for the Project, but reference to other similar projects making direct application of an Environmental Permit is made including:
Application No. Project Title DIR-080/2003 Reuse of Treated Effluent from Ngong Ping Sewage Treatment plant for Toilet Flushing DIR-125/2005 Demonstration Scheme on Reclaimed Water Uses in the North District DIR-174/2008 Reuse of Treated Sewage Effluent from Redeveloped Lo Wu Correctional Institution DIR-181/2009 Water Reclamation Facilities in Pumping Station and Preliminary Treatment Works of Drainage Services Department DIR-182/2009 Water Reclamation Facilities for Yuen Long, Sai Kung and Stanley Sewage Treatment Works DIR-183/2009 Water Reclamation Facilities for Stonecutters Island, Sham Tseng and Siu Ho Wan Sewage Treatment Works
Page 9 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
For the projects of the reuse of treated effluent from Ngong Ping Sewage Treatment Plant for toilet flushing operated by DSD and the demonstration scheme on reclaimed water uses in the North District operated by EPD before, the performance of the facilities was satisfactory.
7 SUMMARY OF POTENTIAL ENVIRONMENTAL IMPACTS AND MIGITATION MEASURES
The potential environmental impacts and the proposed environmental mitigation measures to be incorporated into the design and construction contract of the proposed Facility are summarized in the following table:
Project Stage Potential Environmental Mitigation Measures Relevant Section in Impact this Project Profile Minor dust nuisance Control by contract specifications 4.1.1 & 5.1.1 Minor noise impact Control by contract specifications 4.1.2 & 5.1.2 Minor water quality impact Control by contract specifications 4.1.3 & 5.1.3 Minor waste impact Control by contract specifications 4.1.4 & 5.1.4 Ecological impact No adverse impact is identified; 4.1.5 Construction no mitigation measure is required. Landscape and visual No adverse impact is identified; 4.1.6 no mitigation measure is required. Health and hygiene No adverse impact is identified; 4.1.7 no mitigation measure is required. Impact on natural resources Beneficial impact; no mitigation 4.2.1 measure is required. Air quality No adverse impact is identified; 4.2.2 no mitigation measure is required. Minor noise impact The blowers of the Facility will 4.2.3 & 5.2.1 be enclosed to contain the noise emissions. Water quality No adverse impact is identified. 4.2.4 & 5.2.2 In case complete failure of the Facility, potable water will be used for make-up water, ground and facility washing, toilet flushing, polymer preparation and Operation landscape irrigation. Minor waste impact The concentrate from the Facility 4.2.5 during operation will be collected and diverted to the sewage collection points of DSD sewage treatment works for treatment. Ecological impact No adverse impact is identified; 4.2.6 no mitigation measure is required. Impact on health and To avoid cross-connection of the 4.2.7 & 5.2.3 hygiene reclaimed water supply to the potable water supply, the pipes for the reclaimed water will be specially arranged to differentiate them from that of the potable
Page 10 Project Profile – Water Reclamation Facility in Tai Po Sewage Treatment Works
Project Stage Potential Environmental Mitigation Measures Relevant Section in Impact this Project Profile water pipes. Hazard impact No adverse impact is identified; 4.2.8 no mitigation measure is required. Landscape and visual No adverse impact is identified; 4.2.9 no mitigation measure is required.
With proper implementation of the above environmental mitigation measures that will be incorporated into the contract of the proposed water reclamation facility, insurmountable environmental impact during the construction and operation stages of the proposed Facility is not expected.
To conclude, the use of reclaimed water in the existing DSD sewage treatment works has the advantages of (i) reducing the demand on potable water, which is a scarce resource deserved for preservation to the maximum extent practicable and (ii) reducing wastewater discharges from the sewage treatment works and the pollution loading to the environment.
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Page 11 20.4 Ruin
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