AN EXPERIMENTAL STUDY ON PRODUCTION OF ORGANIC FERTILIZER FROM FOOD WASTE BY HYDROTHERMAL CONVERSION

DU Kun; CHI Yong; WANG Lixian

doi:10.13205/j.hjgc.202308020

Volume 41 Issue 8

Aug. 2023

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DU Kun, CHI Yong, WANG Lixian. AN EXPERIMENTAL STUDY ON PRODUCTION OF ORGANIC FERTILIZER FROM FOOD WASTE BY HYDROTHERMAL CONVERSION[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 162-168. doi: 10.13205/j.hjgc.202308020

Citation:

DU Kun, CHI Yong, WANG Lixian. AN EXPERIMENTAL STUDY ON PRODUCTION OF ORGANIC FERTILIZER FROM FOOD WASTE BY HYDROTHERMAL CONVERSION[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 162-168. doi: 10.13205/j.hjgc.202308020

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AN EXPERIMENTAL STUDY ON PRODUCTION OF ORGANIC FERTILIZER FROM FOOD WASTE BY HYDROTHERMAL CONVERSION

doi: 10.13205/j.hjgc.202308020

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Received Date: 2022-11-28
Available Online: 2023-11-15

Abstract

Abstract

Hydrothermal treatment has the advantages of high efficiency, cleanness, and safety in food waste disposal, which has been widely concerned by global scholars in recent years. In this paper, the experimental study on the production of organic fertilizer from simulated food waste by hydrothermal conversion was carried out at a temperature of 175 to 235 ℃, and a retention time of 20 to 80 min. Results showed that the fertilizer efficiency of food waste after hydrothermal treatment was higher than traditional composting treatment. The content of organic matter and total nutrients were 55.77% to 72.92% and 7.39% to 8.20% respectively, far higher than the limiting values in the Standard of Organic Fertilizer (NY 525—2021). Hydrothermal process could promote the formation of humic acid. With a retention time of 40 min at 205 ℃, the humic acid content reached 21.70%, and the humification index (the ratio of humic to fulvic) could be 1.67, reflecting a very high degree of maturity. Hydrothermal treatment could enhance the migration of salts. Most monovalent metals (potassium and sodium) resided into the liquid phase from the solid phase, while most multivalent metals (calcium, magnesium, and iron) remained integrated within the solid phase.
- food waste,
- hydrothermal conversion,
- organic fertilizer,
- humic acids,
- inorganic salts

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References(31)

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