EFFECT OF pH ON ANAEROBIC HYDROLYSIS ACIDIFICATION STAGE OF FRUIT AND VEGETABLE WASTES AND GARDEN WASTES

YANG Meng; JIANG Jian-guo; XU Yi-wen; LIU Nuo

doi:10.13205/j.hjgc.202205015

Volume 40 Issue 5

Jul. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(5): 103-108

YANG Meng, JIANG Jian-guo, XU Yi-wen, LIU Nuo. EFFECT OF pH ON ANAEROBIC HYDROLYSIS ACIDIFICATION STAGE OF FRUIT AND VEGETABLE WASTES AND GARDEN WASTES[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 103-108. doi: 10.13205/j.hjgc.202205015

Citation:

YANG Meng, JIANG Jian-guo, XU Yi-wen, LIU Nuo. EFFECT OF pH ON ANAEROBIC HYDROLYSIS ACIDIFICATION STAGE OF FRUIT AND VEGETABLE WASTES AND GARDEN WASTES[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 103-108. doi: 10.13205/j.hjgc.202205015

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EFFECT OF pH ON ANAEROBIC HYDROLYSIS ACIDIFICATION STAGE OF FRUIT AND VEGETABLE WASTES AND GARDEN WASTES

doi: 10.13205/j.hjgc.202205015

1. School of Environment, Tsinghua University, Beijing 100084, China;
2. China Urban Construction Design and Research Institute Co., Ltd., Beijing 100029, China;
3. College of Environmental Science and Engineering, Tongji University 200092, Shanghai

Received Date: 2021-05-20
Available Online: 2022-07-02

Abstract

Abstract

In this study, fruit and vegetable wastes and garden wastes were treated with anaerobic hydrolysis technology, and the effect of pH on acid production was also discussed. At temperature of 45℃, pH=6, the volatile fatty acid(VFA) concentration of the fermentation liquor in the reactor reached the maximum value of 12.94 g/L on the 11 th day, which was 3.37 times the VFA concentration under the unregulated pH condition, and the time needed to reach the VFA maximum value was reduced by 20%, greatly improving the acid production efficiency. Regulation of pH could also promote the conversion of soluble COD(SCOD) into VFAs. The maximum VFA/SCOD value was achieved on the 11 th day under the condition of pH 6, was 48.73%, which was beneficial to subsequent utilization as a carbon source. By further analyzing the VFA component and ammonia nitrogen concentration in the fermentation liquor with different pH, the condition of pH=6 could change the fermentation type from ethanol type fermentation to butyric acid type fermentation, which was also beneficial to protein decomposition.
- fruit and vegetable waste,
- garden wastes,
- anaerobic hydrolysis acidification stage,
- pH

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References(34)

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