Pretreatment method of two-stage enhanced coagulation deoiling for coal chemical industry wastewater
A technology for coal chemical wastewater and pretreatment, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sewage treatment and other directions, can solve the problems of complex operation, material blockage, easy entrainment and escape, etc., and achieves a clear process principle. Reasonable, low processing cost and stable operation
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[0039] In this example, a certain coal-gas wastewater in Xinjiang is treated as the treatment object. The COD concentration in the treated wastewater is 17061mg / L, the TN concentration is 6992mg / L, the ammonia nitrogen concentration is 3135mg / L, the total oil concentration is 1496mg / L, and the pH value is 8.82. After gravity degreasing, the total oil concentration in the effluent water of the grease trap is 1284mg / L, and the total oil removal rate is 14.2%.
[0040] (1) Introduce the effluent from the grease trap into the first-level coagulation tank, and add inorganic polymer coagulant to the first-level coagulation tank to form small flocs, then add organic polymer flocculants to make the flocs larger , the effluent from the primary coagulation tank flows into the floating sink tank for oil and water separation;
[0041] A. Examine the removal of COD and total oil by using polyaluminum chloride and polyferric chloride as coagulants under different dosage conditions. The res...
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