为了探究超声强化污泥水解小分子化过程中溶解性有机物（DOMs）的产生途径以及变化情况，进行了超声强化污泥水解试验和序批式污泥厌氧消化试验。结果表明，超声强化污泥水解引起的胞外聚合物（EPS）破解导致污泥粒径从32.52 μm减小到了26.23 μm，有机物从紧密EPS向可溶EPS转移从而产生DOMs，可溶EPS的COD值从232 mg/L增加到2 180 mg/L。可溶性蛋白质和可溶性多糖的释放程度均与能量输入比呈正相关，且二者是生成短链脂肪酸（SCFAs）的重要底物。厌氧消化过程中，SCFAs生成量随着EPS的破解而增加，乙酸和丙酸占SCFAs总质量的67.4%~85.0%。未处理污泥的主要荧光组分为类蛋白物质，而经过超声预处理后污泥的主要荧光组分为类蛋白物质和类腐殖酸物质。

In order to investigate the generation and changes of dissolved organic matters (DOMs) during the hydrolysis process of sludge enhanced by ultrasound and anaerobic digestion,sludge hydrolysis enhanced by ultrasonic test and sequential batch sludge anaerobic digestion test are carried out.The results show that decomposition of extracellular polymeric substances (EPS) caused by sludge hydrolysis enhanced by ultrasonic reduces the particle size of sludge from 32.52 μm to 26.23 μm,and organic matters shift from tightly bounded EPS into soluble EPS,which leads to the generation of DOMs.COD of soluble EPS increases from 232 mg·L^-1 to 2,180 mg·L^-1.The release degrees of both soluble protein and soluble polysaccharide are positively correlated with the specific energy input,both are important substrates for the production of short-chain fatty acids (SCFAs).In the anaerobic digestion process,the amount of SCFAs produced increases with the decomposition of EPS,and acetic acid and propionic acid totally accounts for 67.4%-85.0% of the total mass of SCFAs.The main fluorescent components of untreated sludge are protein-like substances,and the main fluorescent components of sludge after ultrasonic pretreatment are protein-like substances and humic acid-like substances.

吴少奇(1993-),男,硕士研究生,研究方向为污泥的处理与资源化利用,jl85761886@163.com