[Experimental study on the treatment of organic wastewater containing chlorobenzene by using an EGSB reactor]

In this paper, the study on the inhibition and recovery of the methanogenic activity of the granular sludge which uncontacted and contacted with chlorobenzene caused by chlorobenzene, and the study of the treatment of organic wastewater containing chlorobenzene by using an EGSB reactor were conducted. The results showed that the activity of the granular sludge which had not contacted with chlorobenzene would be inhibited by different concentrations chlorobenzene; but for the granular sludge which had contacted with chlorobenzene, its activity would be inhibited only by higher concentration (100 mg/L) chlorobenzene. Using EGSB reactor to treat organic wastewater containing chlorobenzene, when the influent chlorobenzene concentration was about 10-50 mg/L, the effluent concentration was lower than 7 mg/L before 65 days, but after the 66th day, the effluent concentration suddenly reached above 25 mg/L, and after stopping adding chlorobenzene, the effluent chlorobenzene concentration was between 3.4-38.32 mg/L, this showed that the high chlorobenzene removal efficiency was mainly due to the strong adsorption by granular sludge, and the biological degradation of chlorobenzene was not obvious.