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| Effect of aged refuse on hydrolysis-acidification of waste activated sludge anaerobic fermentation |
| DENG Yong-chao1,2, ZHAO Jian-wei1,2, LI Xiao-ming1,2, YANG Qi1,2, XU Qiu-xiang1,2, LIU Jun1,2, WANG Li-qun1,2, YI Kai-xin1,2 |
1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;
2. Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, China |
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Abstract This paper investigated the effects of aged refuse on the hydrolysis and acidification processes of waste activated sludge (WAS) anaerobic fermentation by adding different dosages of aged refuse. Experimental results showed that significant improvements of hydrolysis and acidification of WAS anaerobic fermentation were achieved within the dosage of 1/3g/g TSS (total suspended solid) and the optimum dosage of aged refuse was 1/3g/g TSS. The ratio of SCOD/TCOD and the short chain fatty acids (SCFAs) production (183.45mg COD/g VSS, 6d) in the presence of aged refuse were largely higher than those in the blank (79.45mg COD/g VSS, 10d). Mechanism study showed that the appropriate inoculation quantity of aged refuse could enhance sludge solubilization, hydrolysis of protein and polysaccharide, acidification of glucose and amino acid. In addition, the key enzymes relevant to hydrolysis and acidification in the presence of aged refuse were much higher than those in blank, which further confirmed that aged refuse could improve hydrolysis and acidification of WAS anaerobic fermentation.
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Received: 25 October 2015
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