酶促污泥原位减量研究现状

Current Situation of In-situ Enzymatic Sludge Reduction

生物处理是城市污水处理领域的主流工艺,其在运行过程中会产生大量的剩余污泥,而剩余污泥的处理已经成为环境领域的一大难题。对酶促污泥原位减量进行了综述,认为胞外酶对污泥死亡微生物残留物的水解有推动作用,继而强化了隐性增长型污泥减量;通过对胞外水解酶在污泥絮体中分布的回顾,认为胞外聚合物(EPS)是阻碍酶促污泥原位减量的一个重要原因,因此强化酶促的关键是打破污泥絮体。研究表明,超声、辐射及低温热解等都具有强化酶促功能,除此以外,还有部分强化酶促工艺如酶复合、辐射及反硫化等可以直接提高酶的活性,强化污泥原位减量。

Biotechnology is a mainstream process in the field of urban sewage treatment.During the operation process,a large amount of excess sludge will be generated.The disposal of the excess sludge has become an urgent environmental problem.This article reviews the in-situ reduction of enzymatic sludge,and believes that extracellular enzymes can promote the hydrolysis of dead microbial residues in sludge,and then reinforce the reduction of recessive growth sludge.Based on the review of the distribution of enzymes in sludge flocs,this work suggests that extracellular polymeric substance(EPS)is an important factor that hinders in-situ enzymatic sludge reduction.Thus,the key to enhanced enzymatic production is to break the sludge flocs which could be achieved by existing enzymatic processes such as sonication,radiation,and low-temperature pyrolysis.In addition,some improvement processes such as enzymatic complexing,radiation,and reverse sulfidation can directly increase the activity of the enzyme and strengthen the in-situ sludge reduction.