How to remove sulfides in refinery wastewater treatment
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Our company’s wastewater treatment system for refinery operations uses a combination of homogenization, oil separation, two-stage air flotation, and A/O processes. The sulfur compound content in the incoming wastewater is below 20 mg/l, but it rises to around 10 mg/l in the treated water. The SV value in the aeration tank is around 60%, while the DO level ranges from 3 to 5. The MLSS concentration is between 3 and 5 g/l. In tank A, the DO level is below 0.5. I would like to ask those with experience in this field: in which stage are sulfur compounds primarily removed, and what methods can be used to remove them to the greatest extent possible?
This process flow does not include a primary sedimentation stage; air flotation combined with PAC coagulant or iron salts could be considered as alternatives
Add ferrous sulfate? Will it have an impact on the subsequent biochemistry?
Add ferrous sulfate? Will it have an impact on the subsequent biochemistry?