Municipal sludge dewatering properties and heavy metal distribution: Effects of surfactant and hydrothermal treatment
Municipal sludge dewatering properties and heavy metal distribution: Effects of surfactant and hydrothermal treatment
复制标题
城市污泥脱水特性和重金属分布：表面活性剂和水热处理的影响
DOI：
10.1016/j.scitotenv.2019.136346
复制
发表时间：
2020-03-25
影响因子：
9.8
通讯作者：
Sun, Yifei
中科院分区：
文献类型：
--
作者：
Liu, Xingshuang;Wang, Jin;Sun, Yifei
胞外聚合物（EPS）在降低城市污泥含水率和去除重金属方面具有重要作用。以十六烷基三甲基溴化铵（CTAB）和伯醇聚氧乙烯醚（AEO（9））为原料，制备了复合表面活性剂。采用混合表面活性剂和水热处理（HIT）处理城市污泥，测试不同比例和含量的表面活性剂处理后的EPS的污泥脱水和重金属吸附性能。结果表明，不同比例的EPS对污泥中主要重金属的吸附能力不同，吸附量为20.48%~ 29.82%。EPS对重金属的吸附量与蛋白质含量呈显著正相关（R-2 = 0.9266，P = .00）。多糖（R-2 = 0.0092，P = 0.00）和核酸（R-2 = 0.0638，P = 0.00）与重金属吸附量无显著相关性。10% CTAB、15% AEO（9）和HTT的联合处理使污泥的结合水含量最低，zeta电位提高了49.2mV，污泥比电阻仅为原污泥的0.66%。(C)2018爱思唯尔B. V.保留所有权利。
Extracellular polymeric substances (EPS) play an important role in reducing moisture content and removing heavy metals from municipal sludge. In this study, cetyl trimethyl ammonium bromide (CTAB) and primary alcohol ethoxylate (AEO(9)) were used to prepare complex surfactants. Municipal sludge was treated with mixed surfactants and hydrotherrnal treatment (HIT) to test the sludge dewatering and heavy metal adsorption performance of EPS treated with varying proportions and contents of surfactants. The results showed that EPS with different proportions had different adsorption capacities for major heavy metals in sludge was 20.48%-29.82%. The adsorption capacity of EPS on heavy metals is significantly positively correlated with protein content (R-2 = 0.9266, P = .00). There is no significant correlation between polysaccharides (R-2 = 0.0092, P = .00) and nucleic adds (R-2 = 0.0638, P = .00) and heavy metal adsorption capacity. Combined treatment of 10% CTAB, 15% AEO(9) and HTT produced the minimal bound water content in treated sludge, zeta potential increased by 49.2 mV and sludge specific resistance is only 0.66% of the raw sludge. (C) 2018 Elsevier B.V. All rights reserved.