ANALYSIS ON FERMENTATION PATHWAY AND CAPROATE PRODUCTION FROM FOOD WASTE BY DIFFERENT INOCULUM

GUO Zhi-chao; XU Xian-bao; XU Ting-ting; ZHAO Ai-hua; TAI Jun; LIU Ya-nan; XUE Gang; LI Xiang

doi:10.13205/j.hjgc.202109023

Volume 39 Issue 9

Jan. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(9): 160-168

WANG Xing-run, LI Lei, YANG Xiang-hua, TIAN Yong-qiang. PROGRESS IN REMEDIATION OF CHROMIUM-CONTAMINATED SITES[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 1-8,23. doi: 10.13205/j.hjgc.202006001

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GUO Zhi-chao, XU Xian-bao, XU Ting-ting, ZHAO Ai-hua, TAI Jun, LIU Ya-nan, XUE Gang, LI Xiang. ANALYSIS ON FERMENTATION PATHWAY AND CAPROATE PRODUCTION FROM FOOD WASTE BY DIFFERENT INOCULUM[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(9): 160-168. doi: 10.13205/j.hjgc.202109023

WANG Xing-run, LI Lei, YANG Xiang-hua, TIAN Yong-qiang. PROGRESS IN REMEDIATION OF CHROMIUM-CONTAMINATED SITES[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 1-8,23. doi: 10.13205/j.hjgc.202006001

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ANALYSIS ON FERMENTATION PATHWAY AND CAPROATE PRODUCTION FROM FOOD WASTE BY DIFFERENT INOCULUM

doi: 10.13205/j.hjgc.202109023

1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;
2. Shanghai Chengtou Group Co., Ltd, Shanghai 200020, China;
3. Shanghai Environmental Sanitation Engineering Design Institute Co., Ltd, Shanghai 200232, China

Received Date: 2020-10-26
Available Online: 2022-01-21

Abstract

Abstract

Waste activated sludge, granular sludge, distiller's yeast, and vinasse were inoculated in the food waste fermentation for organic acid production. Batch tests were conducted to compare the solubilization, hydrolysis, and acidification processes using four different inoculums during fermentation. Based on the batch test, we investigated the effect of different electron donors on chain elongation to produce caproate. When activated sludge was used as the inoculum of food waste fermentation, the production of L-lactic acid reached 22.2 g COD/L and its optical activity reached 82.3%. It was an effective way to ferment food waste to produce highly optically active L-lactic acid by inoculating activated sludge. Caproate at a concentration of 4.2 g COD/L was produced by inoculating granular sludge during fermentation, indicating the strong capacity of caproate production of granular sludge. When distiller's yeast and vinasse were used as the inoculum, high concentration of butyrate (21.6 g COD/L for distiller's yeast inoculum and 20.4 g COD/L for vinasse inoculum) was obtained, which was the key electron acceptor during chain elongation. The concentration of caproate reached 8.8 g COD/L by inoculating vinasse (lactic acid as the electron donor) and 10.4 g COD/L by inoculating distiller's yeast (ethanol as the electron donor). Microbial community analysis revealed that Streptococcus was the dominant genus, accounting for 80% and 55% by inoculating distiller's yeast and vinasse groups, respectively, showing a strong correlation with the production of high concentration caproate.
- food waste,
- inoculum,
- fermentation,
- carbon chain elongation,
- electron donor,
- caproate

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References

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