In the process of operation,the coking wastewater treatment system has the problem that the total cyanide,chemical oxygen demand and ammonia nitrogen in the wastewater after biochemical treatment are difficult to discharge up to the standard.In order to solve this problem,further cyanide and nitrogen reduction are needed.At present,the most effective method is flocculation precipitation,but the traditional treatment scheme of polyferric sulfate combined with cationic polyacrylamide cannot meet the requirements of on-site treatment.AK873 was developed in response to the above situation.After application to the system,the effect is remarkable.The total cyanide in effluent is stable below 0.2 mg·L-1,the chemical oxygen demand is below 20 mg·L-1,the ammonia nitrogen is less than 10 mg·L-1,and the chroma is also reduced.
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