The main raw water has following parameters, water comes from a soap manufacturing factory

  • pH 7.1
  • BOD 520 mg/L
  • COD 4890 mg/L
  • TSS 360 mg/L
  • No Oil & Grease

if you need expected treated effluent data - pH 6.5-8.5
- BOD <50 mg/L
- COD <30 mg/L
- TSS <250 mg/L
- Oil & Grease <10 mg/L

Is activated sludge process efficient for industrial waste water treatment of this kind of raw water? what are the reasons if it isn't a good way to treat such raw water. Any recommendations with reputable sources such as research papers etc?

my proposed process is initial sieve filtration --> airation --> addition of floc (bacteria and protozoa) --> settling tank --> gravity filtration

I'm really new to this and trying to understand it.

please letme know if I asked it in a incorrect way. thanks

  • $\begingroup$ I finf it odd that in the expected effluent data, max. COD is smaller than max. BOD. What's the unit for Oil & Grease? $\endgroup$
    – mart
    Jan 23, 2017 at 14:02
  • $\begingroup$ it's just the accepted levels. Shouldn't it be smaller than BOD?. The unit is mg/L .. $\endgroup$ Jan 23, 2017 at 15:37
  • $\begingroup$ 1) BOD is usually a part of COD, so that BOD is higher in the same water makes physically no sense. Doesn't mean the limits are not what they are. 2) I think with the high COD and high COD/BOD ratio in the raw wastewater that an AS process won't achieve much. But I can't back this hunch up easily so I can't provide a real answer. $\endgroup$
    – mart
    Jan 24, 2017 at 15:31

1 Answer 1


The BOD/COD ratio of this wastewater is low enough that it would be impractical and most likely toxic to the microbiology of an activated sludge process. Here is a good review of the general characterization of wastewater based on BOD, COD, and BOD/COD ratio.


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