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
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