Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
J Environ Sci (China). 2025 Feb;148:409-419. doi: 10.1016/j.jes.2023.11.026. Epub 2023 Dec 6.
Sedimentation sludge water (SSW), a prominent constituent of wastewater from drinking water treatment plants, has received limited attention in terms of its treatment and utilization likely due to the perceived difficulties associated with managing SSW sludge. This study comprehensively evaluated the water quality of SSW by comparing it to a well-documented wastewater (filter backwash water (FBW)). Furthermore, it investigated the pollutant variations in the SSW during pre-sedimentation process, probed the underlying reaction mechanism, and explored the feasibility of employing a pilot-scale coagulation-sedimentation process for SSW treatment. The levels of most water quality parameters were generally comparable between SSW and FBW. During the pre-sedimentation of SSW, significant removal of turbidity, bacterial counts, and dissolved organic matter (DOM) was observed. The characterization of DOM components, molecular weight distributions, and optical properties revealed that the macromolecular proteinaceous biopolymers and humic acids were preferentially removed. The characterization of particulates indicated that high surface energy, zeta potential, and bridging/adsorption/sedimentation/coagulation capacities in aluminum residuals of SSW, underscoring its potential as a coagulant and promoting the generation and sedimentation of inorganic-organic complexes. The coagulation-sedimentation process could effectively remove pollutants from low-turbidity SSW ([turbidity] < 15 NTU). These findings provide valuable insights into the water quality dynamics of SSW during the pre-sedimentation process, facilitating the development of SSW quality management and enhancing its reuse rate.
沉淀污泥水（SSW）是饮用水处理厂废水中的主要成分，但由于管理 SSW 污泥的难度较大，因此其处理和利用一直未得到充分关注。本研究通过将 SSW 与有详细记录的废水（滤池反冲洗水（FBW））进行比较，全面评估了 SSW 的水质。此外，还研究了 SSW 在预沉淀过程中的污染物变化，探究了潜在的反应机制，并探索了采用小型混凝沉淀工艺处理 SSW 的可行性。SSW 和 FBW 的大多数水质参数水平总体相当。在 SSW 的预沉淀过程中，浊度、细菌计数和溶解有机物（DOM）的去除效果显著。DOM 成分、分子量分布和光学特性的表征表明，大分子蛋白质生物聚合物和腐殖酸优先被去除。颗粒物质的表征表明，SSW 中铝残留的高表面能、zeta 电位和桥接/吸附/沉淀/凝聚能力，突出了其作为混凝剂的潜力，并促进了无机-有机复合物的生成和沉淀。混凝沉淀工艺可以有效地去除低浊度 SSW（[浊度] < 15 NTU）中的污染物。这些发现为 SSW 在预沉淀过程中的水质动态提供了有价值的见解，有助于 SSW 质量管理的发展，并提高其再利用率。
