Seeking assistance with the adjustment of slaughterhouse wastewater treatment
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I recently worked on treating slaughterhouse wastewater; the inlet water had a COD level of 1400, total nitrogen at 230, and the SS value was unknown. The treatment process used included oil separation + air flotation + hydrolysis + two stages of contact oxidation. Some time ago, the effluent was clear and all parameters were within the acceptable range: COD at 80 and ammonia nitrogen at 9. Recently, however, the effluent turned yellow suddenly, and the SV30 value dropped from 20 to less than 10. I’m not sure what caused this problem. The sludge is fine-grained, but the sludge on the membranes is in good condition.
It is likely due to excessive aeration, resulting from the decomposition of aged sludge, which causes an increase in both SS and COD in the effluent. It is recommended to reduce aeration volume, add an appropriate amount of carbon source, and increase sludge discharge and recirculation.