Preparation of biochar from anaerobic digested sludge for enhancement of sludge dewatering

被引：2

作者：

Li Z. ^{[1
,2
]}

Chen K. ^{[1
,2
]}

Zhai S. ^{[1
,2
]}

Yang L. ^{[1
,2
]}

Yu T. ^{[1
,2
]}

Yuan H. ^{[1
,2
]}

Zeng B. ^{[1
,2
]}

Yang L. ^{[1
,2
]}

Qi F. ^{[3
]}

Zhu H. ^{[1
,2
]}

机构：

[1] Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing

[2] Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing

[3] College of Environment and Resources, Chongqing Technology and Business University, Chongqing

来源：

Chemosphere | 2024年 / 362卷

基金：

中国国家自然科学基金;

关键词：

Acid modification; Anaerobic digested sludge; Biochar; Montmorillonite; Sludge dewatering;

D O I：

10.1016/j.chemosphere.2024.142687

中图分类号：

学科分类号：

摘要：

Effective dewatering is vital for both sludge treatment and resource recovery. This study focuses on converting post-anaerobic digested sludge into biochar to enhance sludge dewatering. The sludge-derived biochar is further modified with polyacrylamide (PAM-ADBC) and applied with sulfuric acid-modified montmorillonite (HMTS) for better performance. Significant advancements in dewatering were noted, even at reduced HMTS (0.1 g/g DS) and PAM-ADBC (25 g/kg DS) dosages. These improvements resulted in a remarkable 41.96% enhancement in capillary suction time (17.2 s) and a notable 20.26% reduction in moisture content (66.33%), respectively, all while maintaining a stable pH level. HMTS, with leached cations, improved dewatering by decomposing the extracellular polymeric substance structure through electro-neutralization to release the internal bound water within sludge flocs. Simultaneously, PAM-ADBC coagulated decomposed sludge particles into larger flocs to form a skeletal structure with itself to discharge internal water in compression dewatering. This study introduces a resource recovery method for anaerobically digested sludge and highlights its potential for sustainable utilization. © 2024 Elsevier Ltd

引用

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