Compost quality,earthworm activities and microbial communities in biochar-augmented vermicomposting of dewatered activated sludge:the role of biochar particle size  

作　　者：Wei Peng Yue Wang Guangyu Cui Qiyong Xu Hua Zhang Pinjing He Fan Lü 

机构地区：[1]Institute of Waste Treatment and Reclamation,Tongji University,Shanghai 200092,People’s Republic of China. [2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,People’s Republic of China. [3]Shenzhen Engineering Laboratory for Eco-Efficient Recycled Materials,School of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen 518055,People’s Republic of China

出　　处：《Biochar》2024年第1期1293-1308,共16页生物炭(英文)

基　　金：supported by the National Natural Science Foundation of China(52000144);the Fundamental Research Funds for the Central Universities(22120220553,2023-3-YB-11).

摘　　要：Vermicomposting utilizes the synergistic effect of earthworms with microorganisms to accelerate the stabilization of organic matter in biowastes.Nevertheless,the exact mechanism behind the maturity of vermicompost and the growth of earthworms exposed to biochar of varying particle sizes remains unclear.This study presents an investigation of the effect of biochar particle size on earthworm(Eisenia fetida)survival,microbial diver-sity,and the quality of vermicompost products.To address these issues,pelletized dewatered sludge samples from a municipal sewage treatment plant were amended with pine-based biochar with particle sizes of 1-2 mm,25-75μm,200 nm,and 60 nm as the substrate for vermicomposting.This study revealed that the addition of millimeter-scale biochar and micron-scale biochar significantly promoted the degradation of organic matter since the organic matter in the treatment with 1-2 mm biochar at the end of the vermicomposting experiment decreased by 12.6%,which was equivalent to a 1.9-fold increase compared with that of the control.Excessive nanopowdering of nanobiochar significantly affected the survival of earthworms and led to 24.4-33.3%cumulative mortality,while millimeter-scale(mm)biochar and micron-scale(μm)biochar achieved zero mortality.The findings of this study could be used for evaluating the potential impact of nanoscale biochar to earthworms and guiding biochar-augmented vermicomposting.

关 键 词：Sewage sludge VERMICOMPOSTING BIOCHAR Particle sizes Eisenia fetida Gut microbes 

分 类 号：S15[农业科学—土壤学]