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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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