【法规名称】
【法规编号】 79242 什么是编号？
【正 文】
第2页 CAP 358AK TECHNICAL MEMORANDUM STANDARDS FOR EFFLUENTS DISCHARGED INTO DRAINAGE AND SEWERAGE SYSTEMS, INLAND AND COASTAL WATERS
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[接上页] 4.4 The effluent standards take account of the beneficial uses of the different systems, but the systems and control zones fall into convenient groups. In general terms the standards for each group are as follows. 4.4.1 Foul sewers Effluent standards for foul sewers leading to similar Government sewage treatment plants do not differ from zone to zone. Effluents into foul sewers leading to a treatment plant with microbial processes must meet more stringent standards for some toxic metals. This is to protect the processes and ensure that they can continue to treat domestic sewage effectively. 4.4.2 Storm water drains Most storm water drains discharge directly into inland or coastal waters. The Authority will not normally allow effluents to them. If, exceptionally, he does so, effluents to them must meet the standards for the next receiving waters downstream. 4.4.3 Inland waters The beneficial use of inland waters is the only factor governing the effluent quality and quantity that the Authority will license. There is no distinction between zones. There are four groups of inland waters. Inland water grouping Beneficial use Group A abstraction for potable water supply Group B irrigation Group C pond fish culture Group D general amenity and secondary contact recreation There are four sets of effluent standards corresponding to these groups. Streams which enter the sea at gazetted beaches need special attention; they belong to Group D. 4.4.4 Coastal waters 4.4.4.1 The water quality and beneficial uses of coastal waters vary in different water control zones. They need separate effluent standards. In practice this memorandum groups together zones with similar objectives. 4.4.4.2 The memorandum makes a distinction between inshore and marine waters, except in Tolo Harbour, Port Shelter and Deep Bay where tidal flow is restricted. This results in six sets of standards. Coastal water group Control Zones Group I Tolo Harbour, Port Shelter Group II Deep Bay Group IIIa Victoria Harbour inshore Group IIIb Victoria Harbour marine Group IVa Southern, Mirs Bay, Western Buffer, Eastern Buffer, Junk Bay, North Western inshoreGroup IVb Southern, Mirs Bay, Western Buffer, Eastern Buffer, Junk Bay, North Western marine 4.4.4.3 Within the coastal waters are special areas that need specific restrictions. These areas include bathing beaches, sites of special scientific interest, marinas and mariculture sites. Paragraph 9.1 lists the restrictions. 5. Charges for effluent disposal 5.1 Some effluent components can be treated much more efficiently in big communal treatment plants than in individual premises. In some cases, factories do not have the space to treat their own effluents properly. 5.2 The components that can be treated in this way are measured as biochemical oxygen demand, chemical oxygen demand, and suspended solids. The allowable levels of these determinands in effluents to foul sewers are high; this reflects their treatability in the public sewage disposal system. 5.3 All other effluent components have stricter standards. Those who produce effluents must control these other components in their own premises. 5.4 A charge will be levied to pay for the safe disposal of the treatable effluent components. It will be the actual extra cost of treating strong industrial and commercial effluents to the same level as domestic sewage. This charge will be independent of any other fees and charges that may be introduced under the Ordinance. (Enacted 1990) Cap 358AK Part 2 EFFLUENT STANDARDS PART II EFFLUENT STANDARDS 6. Discharges to foul sewers 6.1 Table 1 lists the standards for effluents to foul sewers leading to Government sewage disposal works. If the works include microbial treatment, there are extra requirements. Table 2 lists them. Information on the catchments of sewage disposal works is available for inspection in the Drainage Services Department. 6.2 In addition to the effluent standards, there are some substances that are harmful to the sewers, or resistant to removal by treatment processes. The Authority will not permit them to be discharged into foul sewers. They are listed below. Prohibited substances-FOUL SEWERS polychlorinated biphenyls (PCB) polyaromatic hydrocarbon (PAH) fumigant or pesticide radioactive substances chlorinated hydrocarbons flammable or toxic solvents petroleum oil or tar calcium carbide wastes liable to form scum or deposits in any part of the public sewer any substance of a nature and quantity likely to damage the sewer or to interfere with any of the treatment processes 6.3 The Authority will not normally allow sludge discharges to sewers. To avoid overloading the foul sewers, the Authority will not allow unpolluted water to be discharged into them. 6.4 The Authority will not allow dilution as a means of meeting effluent standards. This would cause excessive hydraulic loading on the disposal system. For this purpose the licence may specify an instantaneous peak flow. This does not necessarily prohibit mixing different effluent streams within the premises. |
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