Study On UV Photolysis And Biodegradation Of Azo Dye

Azo is the most common refractory organic pollutants in dyeing wastewater,conventional biological treatment process that type of waste water treatment effect usually can not meet increasingly stringent water quality requirements. Currently,advanced oxidation pretreatment technology has been proven to improve the biodegradability of azo dyes, which help to improve the rate of biodegradation of subsequent, but the relevant mechanism needs revealed. This paper aims to elaborate theoretically Advanced Oxidation Process and other chemical and physical pretreatment technology to improve the rate of biodegradation of the mechanism of azo dyes, to provide a theoretical basis for the physical and chemical pretreatment technology coupled with biodegradable technology applications in dyeing wastewater treatment.This paper selects Acid Orange 7 as the target pollutants, around the azo dye ultraviolet degradation, biodegradation and ultraviolet irradiation of intermediate to accelerate the biodegradation of azo dye and so on three aspects. Firstly, It presented its possible degradation pathway alone ultraviolet degradation and separate biodegradable, base on UV photolysis and biodegradation intermediates of quantitative and qualitative analysis of AO7. secondly, using ultraviolet radiation pretreatment to accelerate the biodegradation of azo dyes, adding quantitative sulfanilic and aniline, which was endogenous electron donor produced in biodegradation. The result showed the rate of biodegradation of azo dyes can be accelerate by UV irradiation, the rate of UV in 4h and 8h is faster than no lighting by26% and 70%. Because azo dyes generated key intermediate under UV, which play a role of endogenous electronic supplies, thus co-substrates effect to accelerate the biodegradation rate. In addition, the study also confirmed the UV photolysis of amino acid to produce aniline and the main reason is to accelerate the biodegradation and found electronic competitive relationship between the two intermediates and AO7.