厌氧系统中热处理对污泥减量化的影响

为了研究热处理污泥和原污泥的混合比对污泥减量化和污泥厌氧消化的影响,将原污泥和热处理污泥按一定比例进行混合后,投入厌氧反应器中进行消化.研究结果表明,该处理既可以提高污泥减量率,又能改善污泥厌氧消化性能,提高污泥产气量.各实验组在混合初期由于溶液的水解酸化作用,pH值均有所下降,而后逐渐恢复到中性;氨氮浓度稳定上升,不仅抵偿了有机酸浓度增大造成的pH下降,而且提高了污泥体系的缓冲性能,有利于后续的厌氧消化;各实验组的SS浓度变化幅度相当,SCOD浓度降解度最大的是混合比为3：1实验组,达到80%,较原污泥提高了26%.

The effects of heat pretreatment on anaerobic digestion system

In this work, the original and heat-treated sludge were mixed with a certain mix- ing ratio in an anaerobic digestion reactor, and the effects of heat-treatment on sludge reduc- tion were investigated. The results showed that the treatment could increase the ratio of sludge reduction, improve the performance of anaerobic sludge digestion, and heighten the gas production rate. For the effect of dilution and hydrolysis-neutralization, the pH of each experiment series decreased, and then returned to neutral slowly. The ammonia concentra- tions increased stably, which was not only beneficial for remaining a stable pH condition in the reactor, but also useful for the subsequent anaerobic digestion. There were no obvious differences for the concentration of SS among the experiment series, and the 3.1 mixing ra- tio obtained a higher soluble chemical oxygen demand （SCOD） degradation rate （80%）, 26% higher than the original sludge.