高盐条件下染料酸性橙7的生物降解特性

对偶氮染料废水厌氧-好氧生物处理中的高盐度抑制生物活性和芳香胺自氧化问题,通过多种强化策略,考察了NaCl为100g/L时酸性橙7(AO7)的生物降解特性.结果表明,加入葡萄糖(0.5g/L)、蛋白胨(1g/L)和酵母粉(0.5g/L)有利于高盐条件下AO7的生物降解.进水中加入酸性红B对AO7的脱色有加速作用.耐盐污泥中加入蒽醌形成的蒽醌-污泥自固定化体系可以促进AO7脱色,当蒽醌浓度为100mg/L时,AO7最大脱色率约为92%.以活性炭毡作为生物载体,厌氧和好氧体系均可实现稳定运行,且体系污泥沉降性良好,脱色速率达26.67mg/(L×h),且可有效抑制脱色中间产物1-氨基-2-萘酚的好氧自氧化,使COD去除率始终保持在90%以上.

Biodegradation characteristics of Acid Orange 7 under hypersaline conditions.

Aiming at intermediate autoxidation and bioactivity inhibition by hypersaline in anaerobic-aerobic biological treatment processes of azo dyes-loading wastewater, biodegradation characteristics of Acid Orange 7 (AO7) at the NaCl concentration of 100 g/L were investigated using some enhancement strategies. Addition of glucose (0.5g/L), peptone (1g/L) and yeast powder (0.5g/L) was propitious to the degradation of AO7 under hypersaline conditions. Biodecolorization rate of AO7 could be increased when acid red B was added to the anaerobic reactor. Anthraquinone-activated sludge self-immobilization system could enhance the biodecolorization of AO7 when anthraquinone was added to the salt-tolerant sludge and the maximal decolorization rate was about 92% at the anthraquinone concentration of 100mg/L. Addition of activated carbon felt as biological carrier allowed stable running of the anaerobic and aerobic reactors with a good sludge settlement and decoloration rate of 26.67mg/(L×h), and that the autoxidation of intermediate product 1-Amino-2-naphthol under aerobic condition could be inhibited effectively and over 90% of COD removal was maintained.