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Study on treatment of dyeing wastewater by high voltage pulse discharge plasma

Li Shengli;Li Jin;Wang Zhewen;Yao Hongling;Gao Quhua and Ying Xiaogen (Environment Science and technology Center,Huazhong University of Science and Technology, Wuhan 430074)  
A new method,that dyeing wastewater is treated by nonequilibrium plasma produced by high voltage pulse,is proposed.The wastewater of direct blue ZB dyeing was treated with this method.The results showed:when pH of dyeing wastewater was lower than 9.04 and treating time was 30s,the chemical oxygen demand(COD) of the samples without precipitate was reduced by 42.6%.When treating time was more than 30s,the longer the treating time was,the higher the COD of samples without precipitate.The COD of samples was even higher than samples without preated was.The COD of water samples with precipitate always increased along with increasing of treating time.The products of treated dyeing wastewater was detected by HP 5890GC/5970MSD,organic acid was found.The results showed that benzene rings or naphthalene rings in dye were destroyed by the method.
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