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| Treatment of high mass concentration coking wastewater using enhancement catalytic iron carbon internal-electrolysis |
| State Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China） |
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Abstract The treatment of coking wastewater is very difficult because of its high mass concentration pollutant,complicated components and poor biodegradability.To solve the problem,catalytic iron carbon internal-electrolysis process was adopted in the pretreatment of high concentration coking wastewater.The effects of initial pH,sewage residence time,volume ratio of Fe/C and some other key factors on the treatmentwere explored.By orthogonal test,the optimized parameters of catalytic iron carbon internal-electrolysispretreatment of coking wastewater are determined as： influent ρ（CODin）=3 200～3 500 mg/L,pH=3,V（Fe）/V（C）=1∶1,hydraulic retention time=90 min.Under the above conditions,the removalrate of COD,phenol,sulfide,degree and NH3-N are 66%,75%,73%,80% and 34% relyspective,and its biodegradability（BOD5/COD） is also improved from 0.25 to 0.52.In addition,the reactivity is greatly increased.
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2010, Vol. 31 
