indah water effluent standards
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9/16/2015 Indah Water Effluent Standards
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16 September 2015 1:36 AM
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Effluent Standards
Domestic sewage treatment is mainly designed to produce an effluent low insolids and organic. However, other treatments, which remove the nutrients alterthe pH or disinfect the effluent may be added depending on the receivingenvironment for the effluent.
Standards have been established for the quality of effluent discharged fromtreatment plants to receiving waters. These take the form of acceptable upperlimits for various effluent contaminants. Effluents from treatment plants areregularly sampled and tested in laboratories to ensure that these standards arebeing met and that treatment plants are being operated correctly.
Parameter UnitStandards
A B
Temperature C 40 40
pH Value 6.09.0 5.59.0
BOD5 at 20C mg/l 20 50
COD mg/l 50 100
Suspended Solids mg/l 50 100
Mercury mg/l 0.005 0.05
Cadmium mg/l 0.01 0.02
Chromium, Hexavalent mg/l 0.05 0.05
Arsenic mg/l 0.05 0.10
Cyanide mg/l 0.05 0.10
Lead mg/l 0.10 0.5
Chromium, Trivalent mg/l 0.20 1.0
Copper mg/l 0.20 1.0
Manganese mg/l 0.20 1.0
Nickel mg/l 0.20 1.0
Tin mg/l 0.20 1.0
Zinc mg/l 1.0 1.0
Boron mg/l 1.0 4.0
Iron (Fe) mg/l 1.0 5.0
Phenol mg/l 0.001 1.0
9/16/2015 Indah Water Effluent Standards
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Free Chlorine mg/l 1.0 2.0
Sulphide mg/l 0.50 0.5
Oil and Grease mg/l Not Detectable 10.0
The pollutants in sewage are measured in order to better understand and thus facilitate the treatment of sewage as wellas to examine the effects of effluent or treated sewage on the environment.
Effluent from all public sewage treatment plants is sampled at regular intervals and tested in modern laboratories toensure that it meets the required standards. Tests are carried out as part of a monitoring programme in keeping withIndah Water's operational license conditions and to ensure the efficient operation of treatment processes.
This provides for a cleaner and safer environment that improves the living conditions of Malaysians. The two mostimportant parameters measured are Biochemical Oxygen Demand (BOD) and Suspended Solids (SS).
BOD is a measure of the amount of oxygen that sewage consumes over a given time. High BOD is significant because itmeans that sewage will rapidly consume all the naturallydissolved oxygen in streams, rivers and lakes, thus killing off allaquatic life, and rendering the water septic and foulsmelling. SS is a measure of the undissolved material in sewage.High SS leads to sludge deposits in the waterways, thus causing significant environmental deterioration.
Effluent that is discharged upstream of a water supply intake should meet Standard A, while effluent that is dischargeddownstream has to meet Standard B. These standards are set by the Environmental Quality Act 1974.
Standard BOD (mg/L) SS (mg/L)
A 20 50
B 50 100
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