Effects of dissimilatory iron reduction on acetate production from the anaerobic fermentation of waste activated sludge under alkaline conditions

被引:35
|
作者
Zhao, Zisheng [1 ,2 ]
Li, Yang [3 ]
Zhao, Zhiqiang [1 ]
Yu, Qilin [1 ]
Zhang, Yaobin [1 ]
机构
[1] Dalian Univ Technol, Key Lab Ind Ecol & Environm Engn, Sch Environm Sci & Technol, Minist Educ, Dalian 116024, Peoples R China
[2] Zhengzhou Univ, Sch Water Conservancy & Environm, Kexue Rd 100, Zhengzhou 450001, Peoples R China
[3] Dalian Univ Technol, Sch Food & Environm, Key Lab Ind Ecol & Environm Engn, Minist Educ, Panjin 124221, Peoples R China
关键词
Acetate production; Fe3O4; Hydrolysis and acidification; Waste activated sludge; Dissimilatory iron reduction; INTERSPECIES ELECTRON-TRANSFER; FATTY-ACIDS PRODUCTION; IMPROVE METHANE PRODUCTION; EXCESS SLUDGE; IV PILI; DIGESTION; PRETREATMENT; ENHANCEMENT; WATER; ACCUMULATION;
D O I
10.1016/j.envres.2019.109045
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Anaerobic digestion of waste activated sludge (WAS) to produce acetate has recently attracted growing interest, while the slow hydrolytic acidification of sludge and the consumption of acetate by methanogens both decrease the yield of acetate. In this study, Fe3O4 was added to a WAS anaerobic digester under alkaline conditions (pH = 10). The concentration of short-chain fatty acids (SCFA) during WAS anaerobic fermentation was found to be affected positively by Fe3O4. The maximal SCFA production of the Fe3O4-added digester was 3619.4 mg/L, while the maximal SCFA production in the control was 2899.7 mg/L. The increase of SCFA with Fe3O4 was mainly resulted from the increase in acetate accumulation (accounting for 90%), because Fe3O4 stimulated dissimilatory iron reduction (DIR) that participated in the decomposition of complex organics and the transformation of pronionate and butyrate into acetate. Further investigation showed that each step of hydrolytic-acidification process was promoted except the homoacetogenesis. The activity of enzymes and abundance of microbes relevant to hydrolysis and acidification were in agreement with the above results.
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页数:8
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