微氧环境抑制硫酸盐还原反应作用研究

采用含高浓度硫酸盐抗生素废水,对比分析了自然厌氧及微氧水解酸化反应器硫酸盐还原反应,考查了微氧环境对硫酸盐还原反应的抑制作用及其对环境条件的改善.结果表明,系统ORP为-100 mV是影响硫酸盐还原反应的转折点,微氧环境及其所引起的高ORP(-50~50 mV)能够导致SRB失活死亡,抑制硫酸盐还原反应的发生,致使出水硫酸盐浓度大幅升高,而去除的硫酸盐主要用于生物体合成,只有10%~30%.出水中硫化物和气相中H2S质量浓度均降低到了未检出水平,较好地消除了硫化物的毒害作用,极大地改善了周围环境条件.同时微氧环境增强了兼性菌的生理代谢功能,其物理搅拌改善了水力条件,提高了废水水解酸化效果.

Inhibition on sulfate reduction by micro-aerobic environment

The inhibition on sulfate reduction and the improvement to environment by micro oxygen are discussed by comparison of sulfate reduction between anaerobic and micro-aerobic hydrolysis and acidification reactors when antibiotic wastewater containing high strength sulfate is adopted. The results demonstrats that environmental ORP at-100 mV is the turning point for sulfate reduction.And micro-aerobic environment and high ORP(-50~50 mV) induced by it lead to the inactivation even death to SRB,suppressed sulfate reduction,which caused much increase of effluent sulfate.The sulfate removal efficiency is only 10%~30%,which is mainly synthesized in biomass.Both effluent sulfide and gas phase H2S are not detectable,which lead to the elimination of sulfide toxicity and the improvement of environment greatly.Furthermore,micro-aerobic environment intensified the physiological metabolizability of facultative bacteria while aerating stirring improved the hydraulic condition,which enhanced the hydrolysis and acidification effect of wastewater.