| Abstrak | Pollution in the rivers is generally caused by domestic and industrial waste. Some treatments to solve it can be done individually or collectively. The effort can be physical, chemical, or biological treatments chosen by its form, character, kind, quality, quantity. PT Van Melle Indonesia is a candy company which produces a high biological waste with COD concentration 10000-30000 mg/litre. This paper reports activated sludge reactor performance to decrease the waste?s organic content. The reactor is a biological waste water treatment, as a sequence of earlier anaerob process which still has a high COD (700-4000 mg/litre). A continued reactor operation done with retention time variation 24 hours, 18 hours, 12 hours, and 6 hours show reduced COD varied 80-90%. The highest efficiency was 97.59% from the 24 hours retention time, and the lowest efficiency was 89.5% from the 6 hours retention time. |
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