Extracellular biological organic matters in sewage sludge during mesophilic digestion at reduced hydraulic retention time.
Extracellular biological organic matters in sewage sludge during mesophilic digestion at reduced hydraulic retention time.
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DOI：
10.1016/j.watres.2010.11.003
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发表时间：
2011
期刊：
影响因子：
12.8
通讯作者：
Liangliang Wei;Q. Zhao;Kai Hu;Duu-Jong Lee;Chunmei Xie;Jun-qiu Jiang
中科院分区：
文献类型：
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作者：
Liangliang Wei;Q. Zhao;Kai Hu;Duu-Jong Lee;Chunmei Xie;Jun-qiu Jiang
厌氧消化池在低水力停留时间下运行是一种受欢迎的实践。本研究的特点是细胞外生物有机物（EBOM）和上清液有机物的实验室规模的中温消化器（5升）运行在水力停留时间为20，15或10天的污水污泥消化。亲水性和疏水性酸性组分是污泥EBOM的主要成分。在10 d HRT时，EBOM中疏水性酸性组分的水解速率和20 d HRT时上清液中亲水性组分蛋白质的水解速率限制了厌氧过程的进行。在20 d HRT下，可溶性亲水性部分的改善的水解有助于改善消化器性能。为了缩短消化HRT，必须实践疏水酸部分水解的效率。
To operate an anaerobic digester at low hydraulic retention time (HRT) is welcome in practice. This study characterized the extracellular biological organic matter (EBOM) and supernatant organics for a sewage sludge digested in a lab-scale mesophilic digester (5 l) running at an HRT of 20, 15 or 10 d. The hydrophilic and hydrophobic acid fractions were the principal components in the sludge EBOM. The hydrolysis rates for hydrophobic acid fraction related EBOM at 10 d HRT and that of hydrophilic fraction related proteins in supernatant at 20 d HRT limited the anaerobic processes. Improved hydrolysis of soluble hydrophilic fraction assisted improving digester performance at 20 d HRT. To shorten digestion HRT, efficiency of hydrophobic acid fraction hydrolysis has to be practiced.