Treatment Of Simulated Dye Wastewater By Fenton-Sequencing Batch Biofilm Reactor Process

Wastewater from dye production process is characterized by its high concentration of COD and color, poor biodegradability, large quantity of inorganic salts and strong toxicity. If the wastewater was discharged into water body without treatment, it would cause severe environment and ecosystem problem. In recent years, more and more new types of dyestuffs, which could resist photolysis, oxidation and biodegradation, have been designed and produced. This makes it more difficult to treat the wastewater from dye production process. So the way to treat the wastewater attracts much attention in the field of industrial wastewater pollution control.In this paper, a process of combining physic-chemical way with biological way was applied to treat simulated dye wastewater of reactive light yellow K-6G . First, Fenton reagent was used to pretreat the azo dye wastewater. Then sequencing batch biofilm reactor (SBBR) was used in the followed step. The effect of Fenton oxidation on the biodegradability of wastewater was tested by Warburg respiration apparatus and the structure of dye and color removal results were analysed by UV-VIS spectrums. In SBBR process, COD degradation process at aerobic and anoxic stages in a whole period was examined. The stability of COD removal result, the effect of time span of aerobic and anoxic stages and COD loads were investigated. A kinetic model was proposed to describe the degradation process of...