In order to solve the problem of coking sewage,on the basis of the existing facilities and fields,the A/O process was improved.

The generation and composition of coking sewage are analyzed.

By experimental study on effects of coking sewage pretreated by ferrous sulphate on activited sludge process,suitable operating conditions were presented.

Modern technology of purifying coking wastewater;

The paper analyzed the characteristic of original water of wastewater,researched on the progress of coking wastewater treatment technique and the application of the engineering.

In accordance with the problems of coking wastewater treating and characteristics of coking wasterwater,the designed method of strengthening pretreated process,enhancing aftertreated apparatus,adopting the two\|stage aeration and prolonging aeration time was proposed,so that the treated wastewater can meet the National Wastewater Discharge Standard.

In order to solve the over-standard discharge of COD and NH-N in coking waste water,during the modification of ammonia stripping system,the biochemical treatment unit and A/O biological denitrification process are combined,which makes all the indexes of waste water discharged can meet the standard.

The paper introduced the principle, character of technics component and analysis of application management technology of biochemistry dehydrogenate technology of coking waste water that is applied comprehensively at present.