Coal gasification sewage treatment method
A coal gasification sewage and treatment method technology, applied in water/sewage treatment, biological water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of complex operation, no utilization, increased mud volume, etc., and achieve simple operation , save operation and cost, reduce the concentration of ammonia nitrogen and COD
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Embodiment 1
[0034] The coal gasification wastewater used in this example has a hardness of 1000-2000 mg / L, a COD of 200-300 mg / L, and an ammonia nitrogen of 200-300 mg / L. The treatment method of coal gasification sewage includes the following steps in sequence:
[0035] a. Pretreatment of coal gasification sewage:
[0036] Pretreatment includes degreasing treatment and coagulation treatment: the coal gasification sewage is degreased through the flat grease trap, and then enters the coagulation sedimentation tank, and the coagulant polyacrylamide and polyaluminum chloride are added to the coagulation tank, The dosage of polyacrylamide is 3-5㎎ / L, and the dosage of polyaluminum chloride is 200-300mg / L. After stirring, coagulation and sedimentation, the upper sewage enters the softening tank;
[0037] b. Double alkali softening treatment:
[0038] Add double-alkali softener to the softening tank. The double-alkali softener includes sodium hydroxide and soda ash, and add a coagulant at the s...
Embodiment 2
[0045] The difference between embodiment 2 and embodiment 1 is:
[0046] In step b, the amount of soda ash added remains unchanged, the amount of sodium hydroxide added is adjusted so that the pH of the sewage is controlled at 7.2-8.0, the total hardness of the dual-alkali softened effluent is 100-180mg / L, and the total hardness drops by more than 90%;
[0047] After short-term nitrification, effluent COD<40mg / L, ammonia nitrogen<5mg / L;
[0048] COD < 100mg / L, ammonia nitrogen < 80mg / L, and nitrite ion < 55mg / L in the effluent after anaerobic ammonium oxidation;
[0049] COD<50mg / L, ammonia nitrogen<8mg / L, and total nitrogen<15mg / L in the effluent after aerobic aeration treatment meet the GB18918-2002 Class A standard.
Embodiment 3
[0051]The difference between embodiment 3 and embodiment 1 is:
[0052] In step b, the amount of soda ash added remains unchanged, and the amount of sodium hydroxide added is adjusted so that the pH of the sewage is controlled at 8.0-8.5, the total hardness of the dual-alkali softened effluent is 100-150mg / L, and the total hardness drops by more than 90%;
[0053] After short-term nitrification, effluent COD<80mg / L, ammonia nitrogen<75mg / L;
[0054] COD < 80mg / L, ammonia nitrogen < 60mg / L, and nitrite ion < 30mg / L in the effluent after anaerobic ammonium oxidation;
[0055] COD<50mg / L, ammonia nitrogen<8mg / L, and total nitrogen<15mg / L in the effluent after aerobic aeration treatment meet the GB18918-2002 Class A standard.
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