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| Free nitrite pretreatment enhanced methane production from co-digestion of waste activated sludge and tobacco waste |
| XU Xue-qin1, LI Xiao-lan1, HUANG Shan-song1, JIA Hai-jiang1, ZHOU Yun1, LI Xiao-ming2 |
1. China Tobaco Guangxi Industrial Co. Ltd, Nanning 530001, China;
2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China |
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Abstract In order to improve the production efficiency of methane from sludge anaerobic digestion, this study reported a new method of adding tobacco waste (TW) and free nitrous acid (FNA) to the sludge. Experimental results showed that the optimal mixing ratio of sludge and TW was 1:1, and the corresponding methane yield was 203.6mL/g per gram volatile suspended solids (VSS), which was about 1.3times of that in sole sludge digestion. Co-digestion of sludge and TW benefited the consumption of protein, polysaccharide and cellulose in digestive matrix. Further application of free nitrous acid (FNA) pretreatment to improve the efficiency of co-digestion of sludge and TW, the optimal concentration of FNA was 1.5mg/L, the corresponding maximum methane yield was 286.4mL/g VSS. FNA pretreatment could promote the hydrolysis and acidification of organic matters, providing an sufficient digestive matrix for methanogenic Archaea. In addition, FNA pretreatment also enhanced the relative abundance of functional microorganisms of Bacteroidetes and Firmicutes.
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Received: 06 March 2017
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