Palm oil mill effluent (POME) is the mixture of high polluted effluent (from sterilizer and oil room) and low polluted effluent (steam condensate, cooling water, boiler discharge and sanitary effluent).
The effluent characteristics indicates that the COD,BOD and TOC levels are quite high with acidic pH due to free fatty acids.
The primary treatment followed by Anaerobic Treatment reduces COD levels in a range of 3000-6000ppm, which is then treat by Aerobic Process using Aeration Pond/ Extended Aeration.
These programmes reduces BOD levels in a range of 200-300ppm much above the discharge limits.
The poor efficiency is mainly because of:
• Low levels of Dissolve Oxygen
• Limited activity of Bacteria Biomass
The DO levels in both aeration pond or extended aeration systems are always limited as compared to activated sludge treatment.
Lower DO levels also encourage floating sludge and heavy filamentous growth.
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