Hong Kong Regulations

TECHNICAL MEMORANDUM STANDARDS FOR EFFLUENTS DISCHARGED INTO DRAINAGE AND SEWERAGE SYSTEMS, INLAND AND COASTAL WATERS - ANNEX 1

REFERENCE TO ANALYTICAL METHODS

(Past version on 30/06/1997).

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) Determinand ≦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 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) Determinand ≦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 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)
Determinand ≦10 ＞10
and
≦100 ＞100
and
≦500 ＞500
and
≦1000 ＞1000
and
≦2000
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) Determinand
≦200
＞200
and
≦400
＞400
and
≦600
＞600
and
≦800
＞800
and
≦1000
＞1000
and
≦1500
＞1500
and
≦2000
＞2000
and
≦3000 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)
Determinand
≦100
＞100
and
≦500
＞500
and
≦1000
＞1000
and
≦2000
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) Determinand
≦200
＞200
and
≦400
＞400
and
≦600
＞600
and
≦800
＞800
and
≦1000
＞1000
and
≦1500
＞1500
and
≦2000
＞2000
and
≦3000 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) Determinand
≦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 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) Determinand
≦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 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) Determinand
≦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 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) Determinand
≦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 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) Determinand
≦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 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) Determinand
≦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 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)