Singapore legislation

Regulation 10

of Environmental Protection and Management (Trade Effluent) Regulations

Regulation 10

Maximum concentrations of certain substances

Subregulation 1

The Director-General may stipulate —

(a)

the maximum volume and quantity of a substance which may be discharged into a watercourse; and

(b)

the maximum rate at which the substance may be so discharged.

Subregulation 2

Subject to paragraph (1), no person who has been informed by the Director-General by notice in writing of the volume, quantity or rate may discharge the substance into a watercourse in a volume, quantity or at a rate in excess of that so stipulated.

Subregulation 3

Any trade effluent analysed in accordance with regulation 11 shall not contain the following substances in concentrations greater than those set out below: Limit for discharge into a watercourse other than a controlled watercourse in milligrams per litre of trade effluent Limit for discharge into a controlled watercourse in milligrams per litre of trade effluent(a)Total Suspended Solids 50 30(b)Sulphide (as sulphur) 0.2 0.2(c)Cyanide (as CN) 0.1 0.1(d)Detergents (linear alkylate sulphonate as methylene blue active substances) 15 5(e)Grease and Oil 10 (Total) 10 (Hydrocarbons) 1 (Total)(f)Arsenic 0.1 0.01(g)Barium 2 1(h)Iron (as Fe) 10 1(i)Boron 5 0.5(j)Manganese 5 0.5(k)Phenolic Compounds (expressed as phenol) 0.2 Nil.

Subregulation 4

The 5-day Biochemical Oxygen Demand at 20° Celsius (referred to in this paragraph as BOD) and the Chemical Oxygen Demand (referred to in this paragraph as COD) of any trade effluent analysed in accordance with regulation 11 shall not be in proportions greater than those set out below:

(a)

50 milligrams per litre of BOD and 100 milligrams per litre of COD where the trade effluent is discharged into a watercourse other than a controlled watercourse;

(b)

20 milligrams per litre of BOD and 60 milligrams per litre of COD, where the trade effluent is discharged into a controlled watercourse.

Subregulation 5

The concentrations of the following metals in the trade effluent shall not exceed those set out below: Limit for discharge into a watercourse other than a controlled watercourse in milligrams per litre of trade effluent Limit for discharge into a controlled watercourse in milligrams per litre of trade effluent(a)Cadmium 0.1 0.003(b)Chromium (trivalent and hexavalent) 1 0.05(c)Copper 0.1 0.1(d)Lead 0.1 0.1(e)Mercury 0.05 0.001(f)Nickel 1 0.1(g)Selenium 0.5 0.01(h)Silver 0.1 0.1(i)Zinc 1 0.5.

Subregulation 6

Where 2 or more of the metals specified in paragraph (5) are present in the trade effluent, the concentration of the metals shall not be more than —

(a)

1 milligram per litre where the trade effluent is discharged into a watercourse other than a controlled watercourse; and

(b)

0.5 milligram per litre where the trade effluent is discharged into a controlled watercourse.

Subregulation 7

The concentration of —

(a)

free chlorine shall not exceed 1 milligram per litre where the trade effluent is discharged into a watercourse;

(b)

colour shall not exceed 7 Lovibond Units where the trade effluent is discharged into a watercourse;

(c)

phosphates, expressed as PO4, shall not exceed 5 milligrams per litre where the trade effluent is discharged into a watercourse other than a controlled watercourse and 2 milligrams per litre where it is discharged into a controlled watercourse;

(d)

calcium and magnesium, expressed as Ca and Mg respectively, shall not exceed 150 milligrams per litre where the trade effluent is discharged into a controlled watercourse;

(e)

nitrate, expressed as NO3, shall not exceed 20 milligrams per litre where the trade effluent is discharged into a controlled watercourse;

(f)

chloride, expressed as Cl-, shall not exceed 250 milligrams per litre where the trade effluent is discharged into a controlled watercourse;

(g)

total dissolved solids shall not exceed 1,000 milligrams per litre where the trade effluent is discharged into a controlled watercourse;

(h)

sulphate, expressed as SO4, shall not exceed 200 milligrams per litre where the trade effluent is discharged into a controlled watercourse;

(i)

tin shall not exceed 5 milligrams per litre where the trade effluent is discharged into a controlled watercourse; and

(j)

beryllium shall not exceed 0.5 milligram per litre where the trade effluent is discharged into a controlled watercourse.

Read in full context — Environmental Protection and Management (Trade Effluent) Regulations →