EFFECT OF HYPERTHERMOPHILIC PRETREATMENT ON COMPOSTING MATURATION AND BACTERIAL COMMUNITY STRUCTURE OF PUTRESCIBLE WASTE

LI Zhanglongxiang; TANG Yanfei; DAI Xiaohu

doi:10.13205/j.hjgc.202306017

Volume 41 Issue 6

Jun. 2023

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LI Zhanglongxiang, TANG Yanfei, DAI Xiaohu. EFFECT OF HYPERTHERMOPHILIC PRETREATMENT ON COMPOSTING MATURATION AND BACTERIAL COMMUNITY STRUCTURE OF PUTRESCIBLE WASTE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 124-131,186. doi: 10.13205/j.hjgc.202306017

Citation:

LI Zhanglongxiang, TANG Yanfei, DAI Xiaohu. EFFECT OF HYPERTHERMOPHILIC PRETREATMENT ON COMPOSTING MATURATION AND BACTERIAL COMMUNITY STRUCTURE OF PUTRESCIBLE WASTE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 124-131,186. doi: 10.13205/j.hjgc.202306017

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EFFECT OF HYPERTHERMOPHILIC PRETREATMENT ON COMPOSTING MATURATION AND BACTERIAL COMMUNITY STRUCTURE OF PUTRESCIBLE WASTE

doi: 10.13205/j.hjgc.202306017

College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

Received Date: 2023-04-11
Available Online: 2023-09-02

Abstract

Abstract

To explore the effects of hyperthermophilic pretreatment on the maturity and bacterial community of putrescible waste composting, using putrescible waste and straw as raw materials, two treatments were set up:conventional composting (CC) and hyperthermophilic pretreatment composting (HPC, 4 h, 85℃). Compost was carried out using a laboratory-made hyperthermophilic pretreatment reactor and a composting reactor. After hyperthermophilic pretreatment, the contents of amino acid and reducing sugar in the HPC group increased by 34.2% and 52.9%. The results showed that both groups could get mature within 16 days (C/N<18, GI>70%), and hyperthermophilic pretreatment could increase the temperature of the compost pile in advance, prolong the high-temperature period and improve the maturity. Compared with the CC group, the HPC group had a 40.7% increase in temperature accumulation, a 35% increase in seed germination index, and a 40.2% increase in the humification index, at the end of composting. Lactobacillus was the dominant genus during the initial phase of composting, Bacillus was the dominant genus during the thermophilic phase, and Thermobifida was the relatively dominant genus during the maturation phase. Hyperthermophilic pretreatment was beneficial to the enrichment of thermophilic bacterial communities, especially Bacillus. The relative abundance of Bacillus in the initial phase of composting in the HPC group reached 63%, which was conducive to the consumption of organic matter and temperature rise during composting. In the maturation phase of composting, due to the degradation of organic matter, the bacterial community was stimulated to evolve from the function of degrading organic matter to promoting compost maturity.
- putrescible waste,
- composting,
- hyperthermophilic pretreatment,
- humification,
- bacterial community

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References(34)

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