化工环保2025，Vol.45Issue(3)：371-376,6.DOI:10.3969/j.issn.1006-1878.2025.03.008
酸碱处理对自来水厂含铝污泥浓缩及脱水性能的影响
Effect of acidification and alkalization treatment on thickening and dewatering properties of aluminum sludge from water treatment plants
摘要
Abstract
The polyaluminum chloride(PAC)sludge produced in a water treatment plant was used to investigate the settling,thickening and dewatering properties of the sludge after acidification/alkalization treatment.The moisture distribution features of the sludge were analyzed by thermogravimetric-differential scanning calorimetry(TG-DSC)method to reveal the dewatering mechanism.The results show that after reaction for 2 h at pH 2.0 or 12.0,the Al dissolution rates from sludge were(73.24±7.84)％or(20.19±3.52)％,respectively.Compared to alkali treatment,the acid treatment is more conducive to Al dissolution.The settling velocity of the muddy liquid surface is 0.39 cm/min for raw sludge,2.16 cm/min for the acid-treated,and 0.91 cm/min for the alkali-treated,respectively.Compared with the raw sludge,the acid-treated sludge has seen a reduction rate in the sludge volume index(SVI)ranging from 61.5％to 90.7％,with an average of 73.7％,and that of the alkali-treated sludge ranging from 11.3％to 63.5％,with an average of 38.2％.Under the rotating velocity of 20 000 r/min for 40 min,the moisture content of the acid-treated sludge and the alkali-treated sludge decreases from 96.4％to 69.1％and 98.9％to 78.1％,respectively.After acidification treatment,the sludge has seen a reduction in the organic content and the surface zeta potential in the particle surface,with weaker electrostatic repulsion,more uniform particle size distribution,and denser particle structure.Dewatering properties are then effective improved.关键词
含铝污泥/酸化处理/沉降及浓缩/脱水性能Key words
aluminum sludge/acidification/settling and thickening/dewatering property分类
资源环境引用本文复制引用
王旋,戴子承,马平安,白昊,崔红军,张建锋..酸碱处理对自来水厂含铝污泥浓缩及脱水性能的影响[J].化工环保,2025,45(3):371-376,6.基金项目
陕西省科技创新团队项目(2022TD-34). （2022TD-34）
