In-situ methane enrichment in anaerobic digestion of food waste slurry by nano zero-valent iron: Long-term performance and microbial community succession

被引：2
作者：
Li, Yong [1 ,2 ]
Zhang, Zhou [1 ,2 ]
Tang, Jieyu [1 ,2 ]
Ruan, Wenquan [1 ,3 ]
Shi, Wansheng [1 ,2 ]
Huang, Zhenxing [1 ,3 ]
Zhao, Mingxing [1 ,2 ]
机构：
[1] Jiangnan Univ, Sch Environm & Civil Engn, Wuxi 214122, Peoples R China
[2] Jiangnan Univ, Jiangsu Engn Lab Biomass Energy & Carbon Reduct Te, Wuxi 214122, Peoples R China
[3] Jiangsu Collaborat Innovat Ctr Water Treatment Tec, Suzhou 215009, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2024年 / 356卷
基金：
中国国家自然科学基金;
关键词：
Food waste slurry; Anaerobic digestion; Biomethanation; Nano zero-valent iron; Microbial community; INTERSPECIES ELECTRON-TRANSFER; POPULATION-DYNAMICS; REACTOR; NZVI; NANOPARTICLES; ENHANCEMENT; GENERATION; FIELD;
D O I：
10.1016/j.jenvman.2024.120733
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this work, nano zero-valent iron (nZVI) was added to a lab-scale continuous stirring tank reactor (CSTR) for food waste slurry treatment, and the effect of dosing rate and dosage of nZVI were attempted to be changed. The results showed that anaerobic digestion (AD) efficiency and biomethanation stability were optimum under the daily dosing and dosage of 0.48 g/gTCOD. The average daily methane (CH4) yield reached 495.38 mL/gTCOD, which was 43.65% higher than that at control stage, and the maximum CH4 content reached 95%. However, under single dosing rate conditions, high nZVI concentrations caused microbial cell rupture and loosely bound extracellular polymeric substances (LB-EPS) precipitation degradation. The daily dosing rate promoted the hydrogenotrophic methanogenesis pathway, and the activity of coenzyme F420 increased by 400.29%. The microbial analysis indicated that daily addition of nZVI could promote the growth of acid-producing bacteria (Firmicutes and Bacteroidetes) and methanogens (Methanothrix).
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页数：10
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