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Paint wastewater is industrial wastewater generated in the coating process . Its complex composition , containing large amounts of nonbiodegradable organic matter, how to deal with , making the paint wastewater discharge or reuse today Difficulties and hot . Paint wastewater treatment methods include sedimentation, chemical oxidation, anaerobic biochemical treatment , but separate treatment is difficult to meet emission standards , the practical application of the process is often a combination of two or more methods . Of this study is to paint wastewater treatment object to explore the Fenton method as well as Fenton as a pretreatment , the subsequent use of the the SBR system processing are two possible ways of spray paint waste treatment effect , aims to provide a reference for the painting wastewater treatment . First, the impact of the Fenton reaction factor experiments to determine the factors and levels of the orthogonal experiment ; initial experimental conditions by orthogonal experiment ; finally determined by a single factor experiment raw water CODCr 2740 mg / L , the optimum operating conditions : pH = 2.5 , H2O2 dosage amount of 14.62 g / L FeSO4 to vote to increase the amount of 9.12 g / L , reaction time 90 min , at this time the CODCr to the rate reaches 91.39% . Fenton as a pretreatment method , considering the COD removal efficiency and H 2 O 2 oxidation efficiency indicators to analyze the relationship between CODCr , H2O2 dosage , FeSO4 dosage during the experiment . Experimental results show that CODCr: H2O2: FeSO4 = 1.6:1.6:1 ( mass ratio) , Fenton reaction while maintaining the 30 % CODCr removal rate , and 60 % H 2 O 2 utilization . Biodegradability of wastewater experiments show that the Fenton reagent 0.23Qth dosage , making raw water biodegradability increased from 0.31 to 0.49 , significantly improved biochemical sexuality . The experiment also studied the UV improve the utilization of H2O2 , experimental results show that for different Fenton's reagent dosage , UV can CODCr removal rate increased to varying degrees . On an experimental basis to be used alone by Fenton and Fenton pre-treatment , follow-up using SBR biological processing handled in two ways economic and technical comparison , the analysis showed , Fenton as a pretreatment for biological treatment relative to the separate the Fenton treatment methods of water stable processing and low cost . Fenton pretreatment with UV / Fenton pretreatment to do , it was found Fenton pretreatment with respect to UV / Fenton pretreatment advantage in operating costs . Finally, according to the experimental conditions paint wastewater treatment process design .
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