New process for treating coal gasification wastewater with active coke

The invention relates to a new process for treating coal gasification wastewater with active coke, which comprises the following steps: first-stage absorption is carried out on coal gasification wastewater by directly using active coke to remove most of COD, suspended matters and chroma; after the absorption treatment, the outlet water enters an immobilized microbe-anaerobe filter chamber (hereinafter referred to as I-AF) and immobilized microbe-aerobe aeration biological filter (hereinafter referred to as I-BAF) system to be biologically treated, thereby removing most of ammonia nitrogen and COD in the wastewater; second-stage deep absorption is carried out on the outlet water performed by I-AF+I-BAF processing by using active coke; and the outlet water satisfies Grade 1 in Sewage Comprehensive Emission Standard GB8978-96. Compared with the traditional treatment process, the invention has the advantages of simple technical process, low treatment cost, favorable COD and ammonia nitrogen removal effect, small occupation area of facilities, and convenient operational management. In addition, the saturated active coke can be recycled by heating in the anaerobic atmosphere, and the phenols in the saturated active coke can be recycled or the saturated active coke can be directly used as fuel. The invention can be used for treating coal gasification wastewater, coked wastewater and the like at low cost, and has unique effects for treating various high-concentration industrial wastewaters and modifying the prior processes.