(Water Pollution Control Ordinance, Cap 358 section 21) [30 November 1990] (Special Gazette Supplement No. 5 dated 30.11.1990) Cap 358AK Part 1 PRELIMINARY PART I PRELIMINARY 1. Citation and commencement 1.1 This technical memorandum is issued under section 21 of the Water Pollution Control Ordinance. It may be cited as the Technical Memorandum on Effluent Standards. 2. Application and scope 2.1 The Technical Memorandum on Effluent Standards is a guide to the Authority under the Ordinance. It sets the limits that make effluents acceptable into foul sewers, storm water drains, inland and coastal waters. The limits control the physical, chemical and microbial quality of effluents. 2.2 The standards apply to effluents through licences, which the Authority issues under sections 15, 16 and 20 of the Ordinance. The Authority is the Director of Environmental Protection. He will consult this memorandum when fixing the conditions that he will include in a licence. He will not normally impose conditions that are more stringent than those in the memorandum. To do so, he must have good reason. 2.3 Where a user takes water from a nature water course or water body, and then returns it after use, different standards may apply. The Authority will not impose standards requiring the effluent to be cleaner than the water that the user takes. 2.4 This memorandum does not apply to discharges or deposits of wastes that are controlled by the Waste Disposal (Livestock Waste) Regulations (Cap 354 sub. leg.). Nor does it apply to dredging, dumping for land formation or solid waste disposal. Other laws and standards control them. The memorandum does apply to all other discharges and deposits. 2.5 This memorandum sets standards for effluents that differ in different areas and between surface waters and sewers. The standards also vary with the rate of effluent flow, which the Authority may also limit. 2.6 The flow rates the memorandum covers appear in Tables 1 to 10b. The Authority will set standards for effluents outside the listed flow ranges case by case. Standards for effluents above the highest flow band will be more stringent than those in the tables. 2.7 Some effluents may have characteristics or components that are not listed and could be harmful. In these cases, the Authority may set limits case by case. There are certain general prohibitions that apply besides the tables, which are listed in paragraphs 6.2, 8.4 and 9.2. 2.8 At present, the Government Chemist is the only analyst designated by the Ordinance. He alone certifies the quality of an effluent sample in a prosecution. The effluent standards refer to his analytical methods, which appear for reference only in Annex I. 3. Interpretation 3.1 This memorandum uses standard scientific terms. Where the Ordinance defines a term, that definition applies. 3.2 In this memorandum the following definitions also apply. "Effluent" (流出物) means any discharge or deposit subject to control under the Ordinance. "Coastal waters" (海岸水域) means the waters of Hong Kong except inland waters and storm water drains. "Inshore waters" (沿岸水域) means all coastal waters where the water depth is less than 6m at mean low tide, or that are within 200m of the mean low water mark, whichever position is further from the shore. "Marine waters" (海洋水域) means all coastal waters except inshore waters. "Flow rate" (流量率) means the measured volume per unit time of effluent from a premises, averaged over the period of operation in any day accepted by the Authority. Where the flow cannot by measured, it is determined by a method the Authority approves. "Foul sewer" (脏水渠) means a sewer built for the carriage of foul or waste water or so designated by the Authority. "Storm water drain" (雨水渠) means a man made conduit built for natural surface drainage or so designated by the Authority. "Toxic metals" (有毒金属) includes antimony, arsenic, beryllium, cadmium, chromium, copper, lead, mercury, nickel, selenium, silver, thallium, vanadium and any other metals that the Authority specifies. 4. Determining the acceptable characteristics of effluents 4.1 The Ordinance allows the Government to declare water control zones and to set water quality objectives. The objectives describe the water quality that will promote the conservation and best use of the waters in the public interest. 4.2 In deciding whether to grant a licence for an effluent, the Authority's purpose is to meet the relevant objectives. The same purpose governs the conditions that the Authority attaches to the licence. He also must consider the need to protect the drainage or sewerage system, including disposal works, treatment processes, and the health and safety of workers in them. 4.3 Each control zone contains four systems into which wastes may be discharged. They are foul sewers, storm water drains, inland waters (which include water in the ground) and coastal waters. 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. 7. Discharges to storm water drains 7.1 The Authority will not normally allow effluent to storm water drains. In exceptional circumstances, he may do so, in which case the effluent standards will be as for the downstream environmental waters. This may be inland waters or inshore waters. The Authority will also take the advice of the Director of Drainage Services on the available capacity of the storm water drain. 7.2 In a few areas, the foul sewerage is not adequate for existing sewage flows, and storm water drains may serve as combined sewers. The Authority will, after consulting the Director of Drainage Services, declare these combined sewers to be foul sewers for the purpose of fixing effluent standards. This will continue until the effluents can be diverted to separate foul sewers. The Government is working on a territory wide sewerage improvement programme to make this possible. 8. Discharges to inland waters 8.1 Tables 3, 4, 5 and 6 list the standards for effluents to Group A, B, Group C and Group D inland waters respectively. The standards apply to groundwater as to other inland waters. 8.2 For general guidance, Group A inland waters include all waters in water gathering grounds and within the boundaries of country parks. Group B waters are mainly those draining agricultural areas in the New Territories. Group C waters are those running through areas where there are large numbers of fish ponds, mostly in the Yuen Long area. Group D waters are those large enough to permit secondary contact recreation and those draining urban and semi-urban areas. 8.3 The Authority will not allow new effluents to rivers, streams or storm water drains that are within 100m of a gazetted bathing beach and flow through the beach area. This is to protect the health and comfort of bathers. 8.4 They are some substances that the Authority will not allow in effluents to inland waters. They are listed below. Prohibited substances-INLAND WATERS polychlorinated biphenyls (PCB) polyaromatic hydrocarbon (PAH) fumigant, pesticide or toxicant radioactive substances chlorinated hydrocarbons flammable or toxic solvents petroleum oil or tar calcium carbide wastes liable to form scum, deposits or discoloration sludge or solid refuse of any kind detergents in Group A inland waters only 8.5 The Authority will not allow dilution as a means of meeting effluent standards. This would cause excessive loading on the receiving waters and their biota. For this purpose the licence may specify an instantaneous peak flow. This does not necessarily prohibit mixing different effluent streams within the premises. 8.6 The effluent standards in the tables do not apply to household septic tanks that discharge to the ground. The Authority will control them by design and maintenance standards. The general prohibitions still apply. 9. Discharges to coastal waters 9.1 Tables 7, 8, 9a and 9b, and 10a and 10b list the standards for effluents in the various groups of coastal waters. Regardless of these standards, the Authority will not allow new effluents in certain areas. They are listed below. Prohibited Effluents-COASTAL WATERS No new effluent will be allowed: ˙within 100m of the boundaries of a gazetted beach in any direction, including rivers, streams and storm water drains; ˙within 200m of the seaward boundaries of a marine fish culture zone or a site of special scientific interest, and within 100m of the landward boundaries; ˙in any typhoon shelter; ˙in any marina; ˙within 100m of a seawater intake point. 9.2 There are some substances that the Authority will not allow in effluents to coastal waters. They are listed below. Prohibited substances-COASTAL WATERS polychlorinated biphenyls (PCB) polyaromatic hydrocarbon (PAH) fumigant, pesticide or toxicant radioactive substances chlorinated hydrocarbons flammable or toxic solvents petroleum oil or tar calcium carbide wastes liable to form scum, deposits or discoloration sludge, floatable substances or solids larger than 10 mm 9.3 The Authority will not allow dilution as a means of meeting effluent standards. This would cause excessive loading on the receiving waters and their biological systems. For this purpose the licence may specify and instantaneous peak flow. This does not necessarily prohibit mixing different effluent streams within the premises. (Enacted 1990) Cap 358AK Annex 1 REFERENCE TO ANALYTICAL METHODS Annex 1 This table lists the methods used by the Government Chemist. Parameter Reference pH APHA 17ed 4500-H+B Temperature Note (a) Colour Lovibond Tintometer, 25mm cell Conductivity BS 2690: Part 9: 1970: Method 6 Total Suspended Solids APHA 17ed 2540 D Settleable Solid APHA 17ed 2540 F Dissolved Oxygen APHA 17ed 4500-O G Biochemical Oxygen Demand (BOD) BS 6068: Section 2.14: 1984 Chemical Oxygen Demand (COD) ASTM D 1252-88 Test Method B or APHA 17ed 5220 C & D Oil & Grease APHA 17ed 5520 C Metals Pretreatment for total metals Sample Digestion APHA 17ed 3030 A and 3030 F.3b Antimony ｝｝｝｝｝ Beryllium Barium Cadmium Chromium Copper Iron APHA 17ed 3111, 3113 and 3120 as Lead appropriate Manganese Nickel Silver Thallium Vanadium Zinc Arsenic ｝ APHA 17ed 3113 and 3114 Selenium as appropriate Mercury APHA 17ed 3112 Boron APHA 17ed 3120 Cyanide ASTM D 2036-89 or APHA 17ed 4500-CN Sulphide total ｝ free APHA 17ed 4500-S2- H2S Phenols APHA 17ed 5530 Surfactants (total) (total means anionic and non-ionic) Anionic BS 6068: Section 2.23: 1986 or APHA 17ed 5540 C Non-ionic BS 6068: Section 2.24: 1986 Total residual chlorine APHA 17ed 4500-Cl G Total Phosphorus (TP) ASTM D 515-88 Total Reactive Phosphorus APHA 17ed 4500-P Sulphate APHA 17ed 4500-SO4 2- Chloride APHA 17ed 4500-Cl- Fluoride APHA 17ed 4500-(F)- -C Nitrogen-Ammonia APHA 17ed 4500-NH3 Nitrogen-Nitrate APHA 17ed 4500-NO3- Nitrogen-Nitrite APHA 17ed 4500-NO2- Total Kjeldahl Nitrogen (TKN) ASTM D 3590-89 E. coli Notes (b), (c) Reference Notes: ASTM -Annual Book of American Society for Testing and Materials Standards, Vol 11.01 & 11.02. BS -British Standards Institution. APHA 17ed -American Public Health Association. Standard Methods 17th Edition (1989). (a) Temperature sensor should be calibrated against a mercury thermometer of 0.1℃ scale. (b) DoE(1983): The Bacteriological Examination of Drinking Water Supplies 1982, Sec. 7.8 & 7.9. (c) Membrane lauryl sulphate method with in situ urease test for E. coli: Reports on Public Health and Medical Subjects No. 71. Methods for the Examination of Waters and Associated Materials. London: Her Majesty's Stationery Office 1983. (Enacted 1990) Table 1 Standards for effluents discharged into foul sewers leading into Government sewage treatment plants (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦10 >10 and ≦100 >100 and ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 >3000 and ≦4000 >4000 and ≦5000 >5000 and ≦6000 Determinand pH (pH units) 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 Temperature (℃) 43 43 43 43 43 43 43 43 43 43 43 43 43 Suspended solids 1200 1000 900 800 800 800 800 800 800 800 800 800 800 Settleable solids 100 100 100 100 100 100 100 100 100 100 100 100 100 BOD 1200 1000 900 800 800 800 800 800 800 800 800 800 800 COD 3000 2500 2200 2000 2000 2000 2000 2000 2000 2000 2000 2000 2000 Oil & Grease 100 100 50 50 50 40 30 20 20 20 20 20 20 Iron 30 25 25 25 15 12.5 10 7.5 5 3.5 2.5 2 1.5 Boron 8 7 6 5 4 3 2.4 1.6 1.2 0.8 0.6 0.5 0.4 Mercury 0.2 0.15 0.1 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Cadmium 0.2 0.15 0.1 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Copper 4 4 4 3 1.5 1.5 1 1 1 1 1 1 1 Nickel 4 3 3 2 1.5 1.5 1 0.8 0.7 0.7 0.6 0.6 0.6 Chromium 2 2 2 2 1 0.7 0.6 0.4 0.3 0.2 0.1 0.1 0.1 Zinc 5 5 4 3 1.5 1.5 1 0.8 0.7 0.7 0.6 0.6 0.6 Silver 4 3 3 2 1.5 1.5 1 0.8 0.7 0.7 0.6 0.6 0.6 Other toxic metals individually 2.5 2.2 2 1.5 1 0.7 0.6 0.4 0.3 0.2 0.15 0.12 0.1 Total toxic metals 10 10 8 7 3 2 2 1.6 1.4 1.2 1.2 1.2 1 Cyanide 2 2 2 1 0.7 0.5 0.4 0.27 0.2 0.13 0.1 0.08 0.06 Phenols 1 1 1 1 0.7 0.5 0.4 0.27 0.2 0.13 0.1 0.1 0.1 Sulphide 10 10 10 10 5 5 4 2 2 2 1 1 1 Sulphate 1000 1000 1000 1000 1000 1000 1000 900 800 600 600 600 600 Total nitrogen 200 200 200 200 200 200 200 100 100 100 100 100 100 Total phosphorus 50 50 50 50 50 50 50 25 25 25 25 25 25 Surfactants (total) 200 150 50 40 30 25 25 25 25 25 25 25 25 (Enacted 1990) Table 2 Standards for effluents discharged into foul sewers leading into Government sewage treatment plants with microbial treatment (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦10 >10 and ≦100 >100 and ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 >3000 and ≦4000 >4000 and ≦5000 >5000 and ≦6000 Determinand Copper 1.5 1 1 1 0.8 0.6 0.5 0.4 0.3 0.2 0.15 0.1 0.05 NOTE : Standards in this table apply in place of those in Table 1 for the corresponding determinand. (Enacted 1990) Table 3 Standards for effluents discharged into Group A inland waters (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦10 >10 and ≦100 >100 and ≦500 >500 and ≦1000 >1000 and ≦2000 Determinand pH (pH units) 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 Temperature (℃) 35 35 30 30 30 Colour (lovibond units) (25mm cell length) 1 1 1 1 1 Conductivity (ms/cm at 20 ℃) 1000 1000 1000 1000 1000 Suspended solids 10 10 5 5 5 Dissolved oxygen ≧4 ≧4 ≧4 ≧4 ≧4 BOD 10 10 5 5 5 COD 50 50 20 20 10 Oil & Grease 1 1 1 1 1 Boron 2 2 1 0.5 0.5 Barium 2 2 1 0.5 0.5 Iron 2 2 1 0.5 0.5 Arsenic 0.05 0.05 0.05 0.05 0.05 Total chromium 0.05 0.05 0.05 0.05 0.05 Mercury 0.001 0.001 0.001 0.001 0.001 Cadmium 0.001 0.001 0.001 0.001 0.001 Selenium 0.01 0.01 0.01 0.01 0.01 Copper 0.2 0.2 0.2 0.2 0.1 Lead 0.1 0.1 0.1 0.1 0.1 Manganese 0.5 0.5 0.5 0.5 0.5 Zinc 1 1 1 1 1 Other toxic metals individually 0.1 0.1 0.1 0.1 0.1 Total toxic metals 0.3 0.3 0.2 0.2 0.15 Cyanide 0.05 0.05 0.05 0.05 0.02 Phenols 0.1 0.1 0.1 0.1 0.1 Hydrogen sulphide 0.05 0.05 0.05 0.05 0.05 Sulphide 0.2 0.2 0.1 0.1 0.1 Fluoride 1 1 1 1 0.5 Sulphate 800 600 500 400 200 Chloride 800 500 500 200 200 Total reactive phosphorus 1 0.7 0.7 0.5 0.5 Ammonia nitrogen 1 1 1 1 0.5 Nitrate + nitrite nitrogen 15 15 15 10 10 E. coli (count/100 ml) <1 <1 <1 <1 <1 (Enacted 1990. 32 of 2000 s. 48) Table 4 Standards for effluents discharged into Group B inland waters (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 Determinand pH (pH units) 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 Temperature (℃) 35 30 30 30 30 30 30 30 Colour (lovibond units) (25mm cell length) 1 1 1 1 1 1 1 1 Suspended solids 30 30 30 30 30 30 30 30 BOD 20 20 20 20 20 20 20 20 COD 80 80 80 80 80 80 80 80 Oil & Grease 10 10 10 10 10 10 10 10 Iron 10 8 7 5 4 3 2 1 Boron 5 4 3 2.5 2 1.5 1 0.5 Barium 5 4 3 2.5 2 1.5 1 0.5 Mercury 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Cadmium 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Selenium 0.2 0.2 0.2 0.2 0.2 0.1 0.1 0.1 Other toxic metals individually 0.5 0.5 0.2 0.2 0.2 0.1 0.1 0.1 Total Toxic metals 2 1.5 1 0.5 0.5 0.2 0.2 0.2 Cyanide 0.1 0.1 0.1 0.08 0.08 0.05 0.05 0.03 Phenols 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Sulphide 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Fluoride 10 10 8 8 8 5 5 3 Sulphate 800 800 600 600 600 400 400 400 Chloride 1000 1000 800 800 800 600 600 400 Total phosphorus 10 10 10 8 8 8 5 5 Ammonia nitrogen 5 5 5 5 5 5 5 5 Nitrate + nitrite nitrogen 30 30 30 20 20 20 10 10 Surfactants (total) 5 5 5 5 5 5 5 5 E. coli (count/100ml) 100 100 100 100 100 100 100 100 (Enacted 1990) Table 5 Standards for effluents discharged into Group C inland waters (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦100 >100 and ≦500 >500 and ≦1000 >1000 and ≦2000 Determinand pH (pH units) 6-9 6-9 6-9 6-9 Temperature (℃) 30 30 30 30 Colour (lovibond units) (25mm cell length) 1 1 1 1 Suspended solids 20 10 10 5 BOD 20 15 10 5 COD 80 60 40 20 Oil & Grease 1 1 1 1 Boron 10 5 4 2 Barium 1 1 1 0.5 Iron 0.5 0.4 0.3 0.2 Mercury 0.001 0.001 0.001 0.001 Cadmium 0.001 0.001 0.001 0.001 Silver 0.1 0.1 0.1 0.1 Copper 0.1 0.1 0.05 0.05 Selenium 0.1 0.1 0.05 0.05 Lead 0.2 0.2 0.2 0.1 Nickel 0.2 0.2 0.2 0.1 Other toxic metals individually 0.5 0.4 0.3 0.2 Total Toxic metals 0.5 0.4 0.3 0.2 Cyanide 0.05 0.05 0.05 0.01 Phenols 0.1 0.1 0.1 0.1 Sulphide 0.2 0.2 0.2 0.1 Fluoride 10 7 5 4 Sulphate 800 600 400 200 Chloride 1000 1000 1000 1000 Total phosphorus 10 10 8 8 Ammonia nitrogen 2 2 2 1 Nitrate + nitrite nitrogen 30 30 20 20 Surfactants (total) 2 2 2 1 E. coli (count/100ml) 1000 1000 1000 1000 (Enacted 1990) Table 6 Standards for effluents discharged into Group D inland waters (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 Determinand pH (pH units) 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 Temperature (℃) 30 30 30 30 30 30 30 30 Colour (lovibond units) (25mm cell length) 1 1 1 1 1 1 1 1 Suspended solids 30 30 30 30 30 30 30 30 BOD 20 20 20 20 20 20 20 20 COD 80 80 80 80 80 80 80 80 Oil & Grease 10 10 10 10 10 10 10 10 Iron 10 8 7 5 4 2.7 2 1.3 Boron 5 4 3.5 2.5 2 1.5 1 0.7 Barium 5 4 3.5 2.5 2 1.5 1 0.7 Mercury 0.1 0.05 0.001 0.001 0.001 0.001 0.001 0.001 Cadmium 0.1 0.05 0.001 0.001 0.001 0.001 0.001 0.001 Other toxic metals individually 1 1 0.8 0.8 0.5 0.5 0.2 0.2 Total Toxic metals 2 2 1.6 1.6 1 1 0.5 0.4 Cyanide 0.4 0.4 0.3 0.3 0.2 0.1 0.1 0.05 Phenols 0.4 0.3 0.2 0.1 0.1 0.1 0.1 0.1 Sulphide 1 1 1 1 1 1 1 1 Sulphate 800 600 600 600 600 400 400 400 Chloride 1000 800 800 800 600 600 400 400 Fluoride 10 8 8 8 5 5 3 3 Total phosphorus 10 10 10 8 8 8 5 5 Ammonia nitrogen 20 20 20 20 20 20 20 10 Nitrate + nitrite nitrogen 50 50 50 30 30 30 30 20 Surfactants (total) 15 15 15 15 15 15 15 15 E. coli (count/100ml) 1000 1000 1000 1000 1000 1000 1000 1000 (Enacted 1990) Table 7 Standards for effluents discharged into the coastal waters of Tolo and Port Shelter Water Control Zones (ALl units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦10 >10 and ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 >3000 and ≦4000 >4000 and ≦5000 >5000 and ≦6000 Determinand pH (pH units) 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 Temperature (℃) 45 45 45 45 45 45 45 45 45 45 45 45 Colour (lovibond units) (25mm cell length) 1 1 1 1 1 1 1 1 1 1 1 1 Suspended solids 30 30 30 30 30 30 15 15 15 15 15 15 BOD 20 20 20 20 20 20 10 10 10 10 10 10 COD 80 80 80 80 80 80 50 50 50 50 50 50 Oil & Grease 20 20 20 20 20 20 10 10 10 10 10 10 Iron 10 10 10 7 5 4 2.7 2 1.3 1 0.8 0.6 Boron 5 4 3 2.5 2 1.6 1.1 0.8 0.5 0.4 0.3 0.2 Barium 5 4 3 2.5 2 1.6 1.1 0.8 0.5 0.4 0.3 0.2 Mercury 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Cadmium 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Other toxic metals individually 1 1 0.8 0.5 0.5 0.4 0.1 0.1 0.1 0.1 0.1 0.1 Total toxic metals 2 2 1.6 1 1 0.8 0.2 0.2 0.2 0.2 0.14 0.1 Cyanide 0.1 0.1 0.1 0.1 0.1 0.1 0.05 0.05 0.03 0.02 0.02 0.01 Phenols 0.5 0.5 0.5 0.25 0.25 0.25 0.1 0.1 0.1 0.1 0.1 0.1 Sulphide 5 5 5 5 5 5 2.5 2.5 1.5 1 1 0.5 Total residual chlorine 1 1 1 1 1 1 1 1 1 1 1 1 Total nitrogen 20 20 20 15 15 15 15 15 10 10 10 10 Total phosphorus 8 8 5 5 5 5 5 5 5 5 5 5 Surfactants (total) 15 15 15 15 15 15 10 10 10 10 10 10 E. coli (count/100ml) 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 (Enacted 1990) Table 8 Standards for effluents discharged into the coastal waters of Deep Bay Water Control Zone (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦10 >10 and ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 >3000 and ≦4000 >4000 and ≦5000 >5000 and ≦6000 Determinand pH (pH units) 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 Temperature (℃) 45 45 45 45 45 45 45 45 45 45 45 45 Colour (lovibond units) (25mm cell length) 1 1 1 1 1 1 1 1 1 1 1 1 Suspended solids 50 50 50 50 50 50 25 25 25 25 25 25 BOD 20 20 20 20 20 20 10 10 10 10 10 10 COD 80 80 80 80 80 80 50 50 50 50 50 50 Oil & Grease 20 20 20 20 20 20 10 10 10 10 10 10 Iron 10 10 10 7 5 4 3 2 1 1 1 1 Boron 5 4 3 2.5 2 1.6 1.1 0.8 0.5 0.4 0.3 0.2 Barium 5 4 3 2.5 2 1.6 1.1 0.8 0.5 0.4 0.3 0.2 Mercury 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Cadmium 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Other toxic metals individually 1 0.5 0.5 0.5 0.4 0.4 0.25 0.2 0.15 0.1 0.1 0.1 Total toxic metals 2 1 1 1 0.8 0.8 0.5 0.4 0.3 0.2 0.14 0.1 Cyanide 0.1 0.1 0.1 0.1 0.1 0.08 0.06 0.04 0.03 0.02 0.01 0.01 Phenols 0.5 0.5 0.4 0.3 0.25 0.2 0.1 0.1 0.1 0.1 0.1 0.1 Sulphide 5 5 5 5 5 5 2.5 2.5 1.5 1 1 0.5 Total residual chlorine 1 1 1 1 1 1 1 1 1 1 1 1 Total nitrogen 100 100 100 100 100 100 80 80 50 50 50 50 Total phosphorus 10 10 10 10 10 10 8 8 5 5 5 5 Surfactants (total) 15 15 15 15 15 15 10 10 10 10 10 7 E. coli (count/100ml) 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 (Enacted 1990) Table 9a Standards for effluents discharged into the inshore waters of Victoria Harbour Water Control Zone (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦10 >10 and ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 >3000 and ≦4000 >4000 and ≦5000 >5000 and ≦6000 Determinand pH (pH units) 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 Temperature (℃) 40 40 40 40 40 40 40 40 40 40 40 40 Colour (lovibond units) (25mm cell length) 1 1 1 1 1 1 1 1 1 1 1 1 Suspended solids 50 30 30 30 30 30 30 30 30 30 30 30 BOD 50 20 20 20 20 20 20 20 20 20 20 20 COD 100 80 80 80 80 80 80 80 80 80 80 80 Oil & Grease 30 20 20 20 20 20 20 20 20 20 20 20 Iron 15 10 10 7 5 4 2.7 2 1.3 1 08 0.6 Boron 5 4 3 2.7 2 1.6 1.1 0.8 0.5 0.4 0.3 0.2 Barium 5 4 3 2.7 2 1.6 1.1 0.8 0.5 0.4 0.3 0.2 Mercury 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Cadmium 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Other toxic metals individually 1 1 0.8 0.7 0.5 0.4 0.25 0.2 0.15 0.1 0.1 0.1 Total toxic metals 2 2 1.6 1.4 1 0.8 0.5 0.4 0.3 0.2 0.14 0.1 Cyanide 0.2 0.1 0.1 0.1 0.1 0.1 0.05 0.05 0.03 0.02 0.02 0.01 Phenols 0.5 0.5 0.5 0.3 0.25 0.2 0.13 0.1 0.1 0.1 0.1 0.1 Sulphide 5 5 5 5 5 5 2.5 2.5 1.5 1 1 0.5 Total residual chlorine 1 1 1 1 1 1 1 1 1 1 1 1 Total nitrogen 100 100 100 100 100 100 80 80 50 50 50 50 Total phosphorus 10 10 10 10 10 10 8 8 5 5 5 5 Surfactants (total) 20 15 15 15 15 15 10 10 10 10 10 10 E. coli (count/100ml) 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 (Enacted 1990) Table 9b Standards for effluents discharged into the marine waters of Victoria Harbour Water Control Zone (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦10 >10 and ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 >3000 and ≦4000 >4000 and ≦5000 >5000 and ≦6000 Determinand pH (pH units) 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 Temperature (℃) 45 45 45 45 45 45 45 45 45 45 45 45 Colour (lovibond units) (25mm cell length) 4 1 1 1 1 1 1 1 1 1 1 1 Suspended solids 700 600 600 500 375 300 200 150 100 75 60 40 BOD 700 600 600 500 375 300 200 150 100 75 60 40 COD 1500 1200 1200 1000 700 600 400 300 200 100 100 85 Oil & Grease 50 50 50 30 25 20 20 20 20 20 20 20 Iron 20 15 13 10 7.5 6 4 3 2 1.5 1.2 1 Boron 6 5 4 3.5 2.5 2 1.5 1 0.7 0.5 0.4 0.3 Barium 6 5 4 3.5 2.5 2 1.5 1 0.7 0.5 0.4 0.3 Mercury 0.1 0.1 0.05 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Cadmium 0.1 0.1 0.05 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Other toxic metals individually 2 1.5 1 0.8 0.6 0.5 0.32 0.24 0.16 0.12 0.1 0.1 Total toxic metals 4 3 2 1.6 1.2 1 0.64 0.48 0.32 0.24 0.2 0.14 Cyanide 1 0.5 0.5 0.5 0.4 0.3 0.2 0.1 0.1 0.08 0.06 0.04 Phenols 0.5 0.5 0.5 0.3 0.3 0.2 0.1 0.1 0.1 0.1 0.1 0.1 Sulphide 5 5 5 5 5 5 2.5 2.5 1.5 1 1 0.5 Total residual chlorine 1 1 1 1 1 1 1 1 1 1 1 1 Total nitrogen 100 100 100 100 100 100 100 100 100 100 100 50 Total phosphorus 10 10 10 10 10 10 10 10 10 10 10 5 Surfactants (total) 30 20 20 20 15 15 15 15 15 15 15 15 E. coli (count/100ml) 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 (Enacted 1990) Table 10a Standards for effluents discharged into the inshore waters of Southern, Mirs Bay, Junk Bay, North Western, Eastern Buffer and Western Buffer Water Control Zones (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦10 >10 and ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 >3000 and ≦4000 >4000 and ≦5000 >5000 and ≦6000 Determinand pH (pH units) 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 6-9 Temperature (℃) 40 40 40 40 40 40 40 40 40 40 40 40 Colour (lovibond units) (25mm cell length) 1 1 1 1 1 1 1 1 1 1 1 1 Suspended solids 50 30 30 30 30 30 30 30 30 30 30 30 BOD 50 20 20 20 20 20 20 20 20 20 20 20 COD 100 80 80 80 80 80 80 80 80 80 80 80 Oil & Grease 30 20 20 20 20 20 20 20 20 20 20 10 Iron 15 10 10 7 5 4 3 2 1 1 0.8 0.6 Boron 5 4 3 2 2 1.5 1.1 0.8 0.5 0.4 0.3 0.2 Barium 5 4 3 2 2 1.5 1.1 0.8 0.5 0.4 0.3 0.2 Mercury 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Cadmium 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Other toxic metals individually 1 1 0.8 0.7 0.5 0.4 0.3 0.2 0.15 0.1 0.1 0.1 Total toxic metals 2 2 1.6 1.4 1 0.8 0.6 0.4 0.3 0.2 0.1 0.1 Cyanide 0.2 0.1 0.1 0.1 0.1 0.1 0.05 0.05 0.03 0.02 0.02 0.01 Phenols 0.5 0.5 0.5 0.3 0.25 0.2 0.1 0.1 0.1 0.1 0.1 0.1 Sulphide 5 5 5 5 5 5 2.5 2.5 1.5 1 1 0.5 Total residual chlorine 1 1 1 1 1 1 1 1 1 1 1 1 Total nitrogen 100 100 80 80 80 80 50 50 50 50 50 30 Total phosphorus 10 10 8 8 8 8 5 5 5 5 5 5 Surfactants (total) 20 15 15 15 15 15 10 10 10 10 10 10 E. coli (count/100ml) 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 (Enacted 1990) Table 10b Standards for effluents discharged into the marine waters of Southern, Mirs Bay, Junk Bay, North Western, Eastern Buffer and Western Buffer Water Control Zones (All units in mg/L unless otherwise stated; all figures are upper limits unless otherwise indicated) Flow rate (m3/day) ≦10 >10 and ≦200 >200 and ≦400 >400 and ≦600 >600 and ≦800 >800 and ≦1000 >1000 and ≦1500 >1500 and ≦2000 >2000 and ≦3000 >3000 and ≦4000 >4000 and ≦5000 >5000 and ≦6000 Determinand pH (pH units) 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 6-10 Temperature (℃) 45 45 45 45 45 45 45 45 45 45 45 45 Colour (lovibond units) (25mm cell length) 4 1 1 1 1 1 1 1 1 1 1 1 Suspended solids 500 500 500 300 200 200 100 100 50 50 40 30 BOD 500 500 500 300 200 200 100 100 50 50 40 30 COD 1000 1000 1000 700 500 400 300 200 150 100 80 80 Oil & Grease 50 50 50 30 25 20 20 20 20 20 20 20 Iron 20 15 13 10 7 6 4 3 2 1.5 1.2 1 Boron 6 5 4 3.5 2.5 2 1.5 1 0.7 0.5 0.4 0.3 Barium 6 5 4 3.5 2.5 2 1.5 1 0.7 0.5 0.4 0.3 Mercury 0.1 0.1 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Cadmium 0.1 0.1 0.1 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 Other toxic metals individually 2 1.5 1.2 0.8 0.6 0.5 0.32 0.24 0.16 0.12 0.1 0.1 Total toxic metals 4 3 2.4 1.6 1.2 1 0.64 0.48 0.32 0.24 0.2 0.14 Cyanide 1 0.5 0.5 0.5 0.4 0.3 0.2 0.15 0.1 0.08 0.06 0.04 Phenols 0.5 0.5 0.5 0.3 0.25 0.2 0.13 0.1 0.1 0.1 0.1 0.1 Sulphide 5 5 5 5 5 5 2.5 2.5 1.5 1 1 0.5 Total residual chlorine 1 1 1 1 1 1 1 1 1 1 1 1 Total nitrogen 100 100 80 80 80 80 50 50 50 50 50 50 Total phosphorus 10 10 8 8 8 8 5 5 5 5 5 5 Surfactants (total) 30 20 20 20 15 15 15 15 15 15 15 15 E. coli (count/100ml) 4000 4000 4000 4000 4000 4000 4000 4000 4000 4000 4000 4000 (Enacted 1990)
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