The effluent from the secondary sedimentation tank is turbid
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Recently, the secondary sedimentation tank has turned yellow and the effluent is turbid. However, the COD of the effluent is normal at 60 mg/l, and the supernatant from SV30 testing is clear. As I understand it, the SV30 supernatant is clear; the water in the secondary sedimentation tank shouldn’t be turbid, right? I seek help from experts! ! ! Tip: The hydraulic flow rate in the secondary sedimentation tank has not exceeded the limit. The designed water flow rate is 200 T/h, but it is currently 100 T/h.
Cloudy effluent indicates that small sludge particles are flowing out with the water. Denitrification may also affect the clarity of the effluent from the secondary sedimentation tank, and an excessive amount of sludge in the secondary sedimentation tank can likewise cause this phenomenon.