Abstract:

The water quality of the wastewater from coking plants is complex.The main difficulty lies in getting rid of the highly concentrated COD_Cr,NH₃-N and cyanide,etc.O₁/A/O₂(pre-aeration/anoxic/oxic) treatment process has been used as the core,and pre-oil removing pretreatment and post-positive coagulation sedimentation as advanced treatment process by the wastewater treatment project of a coking plant at Shougang,obtaining pretty good treatment effectiveness.The running results indicate that the removing effect of O₁/A/O₂ on the removing rates of COD_Cr and NH₃-N are above 95% and 89%,respectively.In the process of coagulation sedimentation process,polyferric sulfate as flocculant and PAM as coagulant aid are used.When their dosages are 600-800 mg/L and 1-2 mg/L,respectively,their COD_Cr removing rates are about 50%,and the decoloring effectiveness is good.After the pretreatment,biochemical treatment and advanced treatment,the main pollutant index in the effluent meet the second class requirements of the Integrated Discharge Standard of Wastewater.

Key words: anaerobic process, aerobic process, denitrogen, coking wastewater

摘要：

焦化废水水质复杂,处理难点在于去除水中高浓度的COD_Cr、NH₃-N和氰化物等。首钢某焦化厂废水处理工程采用以O₁/A/O₂工艺(预曝气/缺氧/好氧)为核心、前置除油预处理、后置混凝沉淀深度处理工艺,取得了较好的处理效果。运行结果表明:O₁/A/O₂工艺对COD_Cr和NH₃-N的去除率分别可达95%和89%以上;混凝沉淀采用聚合硫酸铁絮凝剂和PAM助凝剂,加药量分别为600～800 mg/L和1～2 mg/L时,CODCr去除率在50%左右,脱色效果好。经过预处理、生化处理及深度处理后,出水主要污染物指标达到了《污水综合排放标准》的二级排放标准要求。

关键词: 厌氧工艺, 好氧工艺, 脱氮, 焦化废水

CLC Number: 

• X784