Huan Jing Ke Xue
Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, Key Laboratary of Environmental Engineering, Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Published: February 2019
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). 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), 288-302 mL·g, 7.80-7.83, and 0.32-0.39 g·L, 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 concentration were also measured.
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http://dx.doi.org/10.13227/j.hjkx.201808114 | DOI Listing |
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