Department of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China.
Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau SAR, 999078, China.
Environ Res. 2021 Mar;194:110641. doi: 10.1016/j.envres.2020.110641. Epub 2020 Dec 27.
The deposal of residual hydrogen peroxide (HO) in Fenton-like system and the requirement of oxygen in bioreactor are essential parts for the treatment of integrative Fenton-like/bioreactor. A novel low-cost integrative Fenton-like and MnO-filled upward flow biological filter bed (Fenton-like/MBFB) equipped with the modified ceramsite was constructed to evaluate the main properties and catalytic activity of modified ceramsite, and the optimal conditions of integrative system and compare integrative and traditional systems. In this study, the Fenton-like reactor with modified ceramsite had higher catalytic ability whose Acid Orange 7 (AO7) degradation efficiency reached to 79.3% due to large surface area and high porosity, compared with that with raw ceramsite (44.3%). Furthermore, total utilization efficiency of HO in integrative system (from 32.41% to 53.51%) and removal efficiencies of COD and AO7 were remarkably improved, which would effectively decrease the waste of HO and the setting of regulation pool and aeration tank. Thus, the integrative system can save 0.51 CNY/m in construction cost and 0.21 CNY/m in operating cost. The average COD removal efficiency, AO7 degradation efficiency and effluent DO concentration were achieved to 64.8%, 79.5% and 9.3 mg/L respectively in integrative system were achieved in integrative system during sixty successive runs. Also, the potential degradation pathway of contaminants was also proposed according to the OH-enhanced at Fenton-like reactor due to catalyst and adsorption of modified ceramsite and the removal of microorganisms and modified ceramsite for contaminants at MBFB. This study demonstrated the feasibility of integrative Fenton-like/MBFB filled with modified ceramsite for simultaneously decreasing operational cost and complexity and enhancing removal efficiency, thus provided a one-step alternative for refractory dye wastewater.
芬顿样系统中残余过氧化氢（HO）的去除和生物反应器中的氧气需求是处理集成芬顿样/生物反应器的重要组成部分。构建了一种新型低成本集成芬顿样和 MnO 填充上流式生物滤床（芬顿样/MBFB），配备改性陶粒，以评估改性陶粒的主要性质和催化活性，优化集成系统的最佳条件，并比较集成系统和传统系统。在这项研究中，由于大表面积和高孔隙率，具有改性陶粒的芬顿样反应器具有更高的催化能力，其酸性橙 7（AO7）降解效率达到 79.3%，而具有原始陶粒的芬顿样反应器（44.3%）。此外，集成系统中 HO 的总利用率（从 32.41%提高到 53.51%）和 COD 和 AO7 的去除效率得到了显著提高，这将有效地减少 HO 的浪费和调节池和曝气池的设置。因此，集成系统在建设成本上可节省 0.51 元/m3，在运营成本上可节省 0.21 元/m3。在六十次连续运行中，集成系统的平均 COD 去除效率、AO7 降解效率和出水 DO 浓度分别达到 64.8%、79.5%和 9.3mg/L。此外，根据催化剂和改性陶粒的吸附以及微生物和改性陶粒对 MBFB 中污染物的去除作用，在芬顿样反应器中产生了 OH 增强作用，提出了污染物的潜在降解途径。本研究证明了填充改性陶粒的集成芬顿样/MBFB 同时降低运营成本和复杂性并提高去除效率的可行性，为难处理染料废水提供了一种一步替代方法。
