Behavior and Biochemical Mechanism of High Iron Attapulgite Dosages Affecting Sewage Sludge Composting

Zhaojing Yu, Bin Wang, Xiaoya Jiang, Weimin Zeng (), Runlan Yu, Xiaoyan Wu, Li Shen, Xueling Wu, Jiaokun Li and Yuandong Liu
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Zhaojing Yu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Bin Wang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Xiaoya Jiang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Weimin Zeng: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Runlan Yu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Xiaoyan Wu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Li Shen: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Xueling Wu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Jiaokun Li: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Yuandong Liu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Sustainability, 2023, vol. 15, issue 16, 1-13

Abstract: We first revealed the behavior and biochemical mechanism of high iron attapulgite (HIAP) and different dosages affecting sewage sludge (SS) composting. HS/TOC ratio increased, but HA/TOC and HA/FA ratios reduced with the increase in HIAP dose. High-dose HIAP promoted the formation of more HS by weak catalytic effect but could bind more FA than HA by strong adsorption effect to inhibit the polymerization of the adsorbed FA into HA. Mixing SS with HIAP and subsequent composting as two consecutive processes during HIAP-amended composting significantly influenced the species distribution of heavy metals (HMs) Cu, Zn, and Cr. Each process roughly contributed one-half to HMs passivation. The bioavailable fraction (BF) of HMs reduced with the increase of HIAP dose. HIAP dose greatly affected the microbial community. Both 1% and 5% HIAP treatments promoted Proteobacteria and Firmicutes , but 10% HIAP promoted Actinobacteriota and Bacteroidota . At the thermophilic phase, HIAP dose greatly affected core thermophilic microbial genera, which were significantly correlated to pile temperature and pH value. In the maturity stage, core microbial genera in different treatments were basically similar and closely correlated to the bioavailable fraction (BF) of HMs and HA, and the influence order was BF–Cr > BF–Cu > BF–Zn > HA. The optimal 5% HIAP dose was recommended.

Keywords: high iron attapulgite; additive dosage effect; humification index; heavy metal bioavailability; microbial community (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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