INFLUENCING FACTORS OF SEMI-CONTINUOUS DRY ANAEROBIC FERMENTATION OF KITCHEN WASTE

ZHAO Liya; LIN Peiru; ZHENG Yi; WANG Pan; REN Lianhai

doi:10.13205/j.hjgc.202211017

Volume 40 Issue 11

Nov. 2022

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ZHAO Liya, LIN Peiru, ZHENG Yi, WANG Pan, REN Lianhai. INFLUENCING FACTORS OF SEMI-CONTINUOUS DRY ANAEROBIC FERMENTATION OF KITCHEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 120-126. doi: 10.13205/j.hjgc.202211017

Citation:

ZHAO Liya, LIN Peiru, ZHENG Yi, WANG Pan, REN Lianhai. INFLUENCING FACTORS OF SEMI-CONTINUOUS DRY ANAEROBIC FERMENTATION OF KITCHEN WASTE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 120-126. doi: 10.13205/j.hjgc.202211017

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INFLUENCING FACTORS OF SEMI-CONTINUOUS DRY ANAEROBIC FERMENTATION OF KITCHEN WASTE

doi: 10.13205/j.hjgc.202211017

State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China

Received Date: 2021-12-17
Available Online: 2023-03-24

Abstract

Abstract

The study investigated the effects of organic loading rate (OLR), stirring rate and material retention time on methane production in semi-continuous dry anaerobic fermentation, and used a structural equation model to discuss the dynamics of the regulating factors on the intermediate products and methane production in the anaerobic system. The results showed that when the OLR was increased to 5.5 g VS/(L·d), the methane production reached the peak, and the average daily methane production reached 3084.40 mL/(L·d). Increasing the stirring rate and material retention time could promote methane production, but a lower or higher material retention time led to the accumulation of NH₄⁺-N and VFAs, and inhibited the anaerobic methanogenesis process. The stirring rate of 20 r/min and solid retention time of 1 d were synthetically considered as the most favorable condition for methane synthesis. The structural equation model results revealed that the influence of stirring rate and material retention time on methane production in semi-continuous dry anaerobic fermentation of kitchen waste was greater than that of OLR, and the standardized total effect were 0.435, 0.370 and -0.04, respectively, mainly because the rise of stirring rate effectively relieved the inhibition effect of VFAs on methane production in dry anaerobic fermentation.
- dry anaerobic fermentation,
- kitchen waste,
- methane production,
- structural equation model

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References(28)

References

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