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River Water Pollution Sources

Water pollution is caused by point and non-point sources. Point sources include sewage treatment plants, manufacturing and agro-based industries and animal farms. Non-point sources are defined as diffused sources such as agricultural activities and surface runoffs.

In 2006, the Department of Environment (DOE) registered 18,956 water pollution point sources comprising mainly sewage treatment plants (9,060 : 47.79% inclusive of 601 Network Pump Stations), manufacturing industries (8,543 : 45.07%), animal farms (869 : 4.58%) and agro-based industries (484 : 2.55%)

represents the distribution of industrial water pollution sources from agro-based and manufacturing industries compiled by the DOE in 2006 through field surveys and questionnaires. A total of 9,027 sources were identified with Selangor having the highest number of water pollution sources (1,850 : 20.49%), followed by Johor (1,774 : 19.65%).

According to statistics compiled by the Veterinary Department of Malaysia, the total standing pig population for 2006 was about 1.67 million, a decrease of 1.76 percent compared to 1.7 million in 2005. Correspondingly, the number of pig farms decreased to 869 farms compared to 898 in the previous year.

The number of sewage treatment plants under the management of Indah Water Konsortium Sdn. Bhd. (IWK) had increased to 9,060 in 2006 compared to 8,782 plants in 2005. Selangor had the largest number of sewage treatment plants (2,563 : 28.3%), Perak (1,343 : 14.8%), Johor (1,010 : 11.1%) and Negeri Sembilan (928 : 10.2%) .

BOD POLLUTION LOAD

Domestic sewage discharge, in the form of treated sewage and partially treated sewage, remained the largest contributor of organic pollution load with an estimated biochemical oxygen demand (BOD) load of 883,391.08 kg/day. The estimated BOD loading contributed by other major sectors were agro-based and manufacturing industries (76,790.77 kg/day) and pig farming (213,215.00 kg/day). Table 6.1 indicates the total BOD load in kg/day discharged from sewage treatment plants throughout Malaysia in 2006.

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Table 6.1 Malaysia: Total BOD Load (kg/day) from Sewage Treatment Plants

State No. of STP Total PE Flow (m3/day) BOD Load (kg/day)
Selangor 2,563 5,908,450 1,329,401 332,350.31
Perak 1,343 1,300,430 292,597 73,149.19
Johor 1010 1,198,417 269,644 67,410.96
Negeri Sembilan 928 931,458 209,578 52,394.51
Kedah 755 556,637 125,243 31,310.83
Melaka 725 570,192 128,293 32,073.30
Pulau Pinang 650 2,149,001 483,525 120,881.31
Pahang 486 314,830 70,837 17,709.19
WP Kuala Lumpur 299 2,571,877 578,672 144,668.08
Terengganu 224 75,184 16,916 4,229.10
Perlis 36 16,156 3,635 908.78
WP Labuan 32 39,265 8,835 2,208.66
WP Putrajaya 9 72,833 16,387 4,096.86
Total 9,060 15,704,730 3,533,563 883,391.08

Sumber: IWK Sdn. Bhd.

Note :
STP = Sewage Treatment Plant
PE = Population Equivalent

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Last Updated:

January 18, 2018 @ 2:38 pm

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