State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, PR China.
State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, PR China.
Chemosphere. 2022 Feb;288(Pt 1):132473. doi: 10.1016/j.chemosphere.2021.132473. Epub 2021 Oct 5.
Residual sludge is a by-product with a large volume and complex composition from wastewater treatment plants. It is significant to reduce sludge volume to decrease the negative effects of sludge on environmental pollution and needless land use. We investigated the effects of uncoupler 3, 3', 4', 5-tetrachlorosalicylanilide (TCS) on the properties of sludge. After adding 0.12 g TCS/g VSS with 24 h mixing, the sludge concentration and total ATP content decreased by 51.1% and 60.8%, respectively. At the same time, the microbial community also changed significantly, leading to the decrease of richness and diversity. Additionally, the secretion of extracellular polymeric substances (EPS) reduced approximately 43% under the addition of 0.12 g/g VSS compared with the control. The decrement of EPS may be explained by the decreased relative abundance of functional bacteria (i.e. Chloroflexi reduced about 60% and Nitrospirota reduced about 31%). Notably, the addition of TCS before coagulation conditioning (FeCl) promoted the adhesion of sludge flocs according to the theory of Extended Derjaguin Landau Verwey Overbee (XDLVO), leading to the increased hydrophobicity of the residual sludge. Therefore, energy uncoupling has the potential of improving sludge dewaterability.
剩余污泥是污水处理厂的一种体积大、成分复杂的副产物。减少污泥体积对于降低污泥对环境污染和不必要的土地利用的负面影响非常重要。我们研究了解偶联剂 3,3',4',5-四氯邻苯二甲酰亚胺 (TCS) 对污泥性质的影响。添加 0.12 g TCS/g VSS 并混合 24 小时后，污泥浓度和总 ATP 含量分别降低了 51.1%和 60.8%。同时，微生物群落也发生了显著变化，导致丰富度和多样性降低。此外，与对照相比，添加 0.12 g/g VSS 的 TCS 后，细胞外聚合物 (EPS) 的分泌减少了约 43%。EPS 的减少可能是由于功能细菌（即绿弯菌门减少约 60%，硝化螺旋菌门减少约 31%）相对丰度的减少所致。值得注意的是，根据扩展德加古林-朗道-维韦尔比（XDLVO）理论，在混凝调质（FeCl）前添加 TCS 可促进污泥絮体的附着，从而提高剩余污泥的疏水性。因此，能量解偶联具有改善污泥脱水性能的潜力。
