Abstract
The high salinity and fat contents of kitchen waste (KW) inhibits the effect of two-phase anaerobic digestion system. This research introduces fruit–vegetable waste (FVW) to alleviate the inhibition effect caused by salinity and fat concentrations, and tries to achieve an optimal addition ratio of FVW, an optimal hydraulic remain time (HRT) of acidogenic-phase reactor and methanogenic-phase reactor. A two-phase anaerobic digestion (AD) system was developed to co-dispose KW and FVW. Four sets of experiments were run with different mass proportions between KW and FVW (25–75, 50–50, 75–25, and 100–0 % m/m). Considering the biodegradation rate and the acidification degree, the system with 25 % KW had the best performance during the acidogenic phase. When the system was run with 50 % KW, it not only had the best stability performance but also had a bigger capacity to treat KW than the system with 25 % KW. The system with 50 % KW was the best ratio in this two-phase AD system. Co-digestion of KW and FVW by two-phase AD is feasible. The addition of FVW can reduce the inhibition effect caused by salinity and fat concentrations, reduce the HRT, and lead to a higher degree of acidification.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (41071310 and 41101453), Natural Science Foundation of Zhejiang province (Y5090266), Research Plan of Department of Education of Zhejiang Province(Y201119953), Funded project for youth researcher of Zhejiang Gongshang University (QY11-22), Innovative Research of Undergraduate of Zhejiang Gongshang University (1260XJ1711177), Innovative Research Team in Higher Educational Institutions of Zhejiang Province (T200912), and Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University (SWMES-2010-13).
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Yang, YQ., Shen, DS., Li, N. et al. Co-digestion of kitchen waste and fruit–vegetable waste by two-phase anaerobic digestion. Environ Sci Pollut Res 20, 2162–2171 (2013). https://doi.org/10.1007/s11356-012-1414-y
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DOI: https://doi.org/10.1007/s11356-012-1414-y