Treatment of metal finishing wastewater in sequencing batch process
Metal finishing wastewater contains heavy metals, acids, alkalis, detergents and toxic chemicals such as cyanide far above the Standard B limits of the Environmental Quality (Sewage and Industrial Effluent) Regulation 1979. A sequencing batch process utilising two-tank system was selected to trea...
| Main Authors: | , , , |
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| Format: | Article |
| Published: |
1994
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| Online Access: | http://journalarticle.ukm.my/1310/ http://journalarticle.ukm.my/1310/ |
| Summary: | Metal finishing wastewater contains heavy metals, acids, alkalis, detergents and toxic
chemicals such as cyanide far above the Standard B limits of the Environmental
Quality (Sewage and Industrial Effluent) Regulation 1979. A sequencing batch
process utilising two-tank system was selected to treat such wastewater from a small
metal finishing plant in Kuala Lumpur. Treatment with lime and ferrous sulphate
complexed and precipitated the cyanide and reduced hexavalent to trivalent
chromium which was then precipitated along with other metals as metal hydroxides.
The pH of effluent was accordingly adjusted. The pilot plant was designed to run
automatically according to a chosen treatment and schedule. The quality of
wastewater treated as above was found to meet the Standard B limits |
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