剩余污泥常温厌氧发酵制取外加碳源技术研究

Technology of Producing External Carbon Source by Anaerobic Digestion of Waste Activated Sludge in Normal Temperature

剩余污泥在碱性条件下厌氧发酵会产生大量的易降解有机物如挥发性脂肪酸,可以为污水生物脱氮除磷提供碳源。通过调节p H,研究了本地污水处理厂的剩余污泥在碱性条件下的厌氧发酵,着重考察了碱解处理对污泥融胞效果的影响,并探讨了对后续厌氧消化的促进作用。结果表明,碱处理过程中剩余污泥中有机物发生了显著的溶解,污泥中的细菌被水解破碎,碱处理的p H越高越有利于剩余污泥中有机物溶出,有利于厌氧发酵制取VFAs,p H为11时,VFAs最高达到1 994.78 mg/L,换算成COD为2 898.35 mg/L。

A large amount of easily degradable organic matter such as volatile fatty acids （VFAs） can be produced in the alkaline fermentation process of waste activated sludge, which can provide carbon source for the wastewater biological nutrient removal. The anaerobic fermentation of the local sewage treatment plant sludge in alkaline conditions was investigated by adjusting solution pH. The study focused on the alkaline hydrolysis treatment on sludge melting cellular effects and the role of promoting the subsequent anaerobic digestion was also explored. The results showed that the organic matter in the sludge was dissolved significantly in the alkali treatment process and sludge bacteria were broken hydrolysis, pH of the alkali treatment is conducive to the higher the organic matter in sludge dissolution conducive anaerobic fermentation to produce VFAs. In the pH of 11, VFAs was up to 1 994.78 mg/L in terms of COD as 2 898.35 mg/L.