Influence of Sludge Retention Time on the Performance and Stability of Mesophilic Anaerobic Co-digestion of Food Waste with Waste Activated Sludge

被引：0
|
作者：
Yuan H.-L. [1 ]
Ma J. [1 ]
Xing B.-S. [1 ]
Wen J.-W. [1 ]
Han Y.-L. [1 ]
Li Q. [1 ]
Wang X.-C. [1 ]
机构：
[1] Key Laboratary of Environmental Engineering, Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an
来源：
Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 02期
关键词：
Anaerobic co-digestion; Food waste; Methane; Sludge retention time (SRT); Stability; Waste activated sludge;
D O I：
10.13227/j.hjkx.201808114
中图分类号：
学科分类号：
摘要：
Two parallel digestion systems of food waste (FW) and waste-activated sludge (WAS) were successfully initiated using a continuous stirred-tank reactor (CSTR), and the effect of different reduction extents of sludge retention time (SRT) on the co-digestion of FW and WAS was investigated. SRT Reduction extents longer than 8.3 d were not conducive to the stable operation of the co-digestion system when the organic load rate (OLR) was increased. The reduction extent of SRT should be reduced gradually from 5 d to 0.9 d to achieve high load and stable operation of the co-digestion of FW and WAS. After a long-term operation (approximately 282 d), the co-digestion reached stable operation at SRT of 9.1 d and OLR (calculated by COD) of (12.9±1.5) g•(L•d) -1 . The corresponding methane production, methane yield (calculated by COD), pH, and volatile fatty acid (VFA, calculated by COD) were 3.94-4.25 L•(L•d) -1 , 288-302 mL•g -1 , 7.80-7.83, and 0.32-0.39 g•L -1 , respectively. Additionly, the sludge characteristics of the co-digestion of FW and WAS under a high loading rate were also investigated. The results showed that the primary pathway of methane conversion was through acetic acid during the co-digestion of FW and WAS. Meanwhile, higher methanogenic activity of acetic acid, propionic acid, butyric acid, valeric acid, and coenzyme F 420 concentration were also measured. © 2019, Science Press. All right reserved.
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页码：994 / 1002
页数：8
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