Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
Sci Total Environ. 2020 Aug 1;728:138853. doi: 10.1016/j.scitotenv.2020.138853. Epub 2020 Apr 22.
The high moisture content of wet sewage sludge generated from wastewater treatment process not only brings high cost of sewage disposal, but also limits its utilization as resource. In this study, an efficient strategy of directly utilizing wet sludge to develop advanced carbocatalyst via a hydrothermal coupled pyrolysis process was proposed. The possible application of as-synthesized carbocatalyst was evaluated by activating peroxymonosulfate (PMS) to degrade a model pollutant of sulfamethoxazole (SMX). Experimental results showed that about 100% of SMX and 59% of total organic carbon (TOC) could be removed within 15 min. Moisture content in wet sludge also affected the performances of as-obtained carbocatalysts. Further studies verified that singlet oxygen (O) dominated SMX degradation, which was generated in the process of PMS activation by CO groups on the surface of carbocatalyst. In the preliminary ecological test, a lower ecotoxicity of SMX degradation solution compared with the original solution was observed. This study demonstrated the feasibility of directly utilizing wet sludge for advanced carbocatalyst fabrication, which provided another solution for wet sludge treatment and utilization.
污水处理过程中产生的高含水率湿污水污泥不仅增加了污水处理成本，而且限制了其作为资源的利用。在本研究中，提出了一种通过水热耦合热解工艺直接利用湿污泥制备先进碳催化剂的有效策略。通过活化过一硫酸盐（PMS）来降解磺胺甲恶唑（SMX）这一模型污染物，评估了所合成碳催化剂的可能应用。实验结果表明，在 15 分钟内可以去除约 100%的 SMX 和 59%的总有机碳（TOC）。污泥中的含水率也会影响所获得的碳催化剂的性能。进一步的研究证实，单线态氧（O）主导了 SMX 的降解，其是在 PMS 通过碳催化剂表面的 CO 基团的活化过程中生成的。在初步的生态测试中，观察到 SMX 降解溶液的生态毒性比原始溶液低。本研究证明了直接利用湿污泥制备先进碳催化剂的可行性，为湿污泥的处理和利用提供了另一种解决方案。
