Synthetic dyes are very diverse in chemical structure including azo, anthraquinone, triphenylmethane, phthalocyanine and heterocycle-containing dyes [1,2]. And about 2-50% of these dyestuffs exist in the effluent due to the low utilization efficiency [3,4]. These synthetic dyes discharged directly or processed incompletely discharged into the environment, may cause bleeding, skin ulceration, nausea and dermatitis [5][6][7]. The dyeing wastewater composition is complicated, characterized by strong color, high pH, high chemical oxygen demand (COD), low biodegradability and the changes of water quality in a wide range [8], belong to stubborn wastewater. Therefore, the deep treatment of printing and dyeing wastewater has caused widespread concern.
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