School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China.
Ningbo Sentrol Environmental Conservation Equipment Co. Ltd., Ningbo, Zhejiang 315000, China.
Sci Total Environ. 2021 Aug 25;784:147204. doi: 10.1016/j.scitotenv.2021.147204. Epub 2021 Apr 19.
This study investigated the advanced treatment of secondary effluent organic matters (EfOM) from an industrial park wastewater treatment plant (IPWTP) by Fenton oxidation process and its combination with biological aerated filter (BAF). The constituents of EfOM were characterized by using fluorescence excitation-emission matrix, and the results showed that the major components included aromatic proteins, soluble microbial products, humic and fulvic acid-like substances, and compounds associated with fluorescent region of Ex 250-300 nm/Em 600-700 nm. The EfOM was strongly resistant to biodegradation (biochemical oxygen demand (BOD):chemical oxygen demand (COD) ratio at 0.11), resulting in less than 15% dissolved organic carbon (DOC) removal efficiency by the BAF reactor. The advanced treatment of EfOM by Fenton oxidation process led to maximum ~50% mineralization efficiency of EfOM under the optimal conditions of 2.0 mM Fe, 10 mM HO, pH 3.0 and 3.0 h of the reaction time. Particularly, Fenton oxidation treatment effectively improved the biodegradability of EfOM in the IPWTP secondary effluents, e.g., increasing the BOD:COD ratio from 0.11 to 0.42. A synergistic combination of Fenton oxidation process with the BAF reactor offered desirable mineralization efficiencies of EfOM (>70%) at lower dosages of Fenton's reagents. The present results suggest that Fenton oxidation process combining with the BAF reactor can be a promising strategy for the advanced treatment of EfOM in IPWTP secondary effluents. This study provides guidance for the characterization and advanced treatment of EfOM in IPWTP secondary effluents for practical purpose.
本研究采用芬顿氧化法及其与曝气生物滤池（BAF）联用工艺对工业园区污水处理厂（IPWTP）二级出水有机污染物（EfOM）进行深度处理。采用荧光激发-发射矩阵对 EfOM 的成分进行了表征，结果表明，主要成分包括芳香族蛋白质、可溶性微生物产物、腐殖酸和富里酸类物质以及与 Ex 250-300nm/Em 600-700nm 荧光区相关的化合物。EfOM 对生物降解具有很强的抗性（生化需氧量（BOD）与化学需氧量（COD）之比为 0.11），导致 BAF 反应器的溶解有机碳（DOC）去除效率不到 15%。在 2.0mMFe、10mMHO、pH3.0 和 3.0h 的最佳条件下，芬顿氧化法对 EfOM 的深度处理可使 EfOM 的矿化效率达到最大值~50%。特别是，芬顿氧化处理可有效提高 IPWTP 二级出水中 EfOM 的可生物降解性，例如将 BOD:COD 比值从 0.11 提高到 0.42。芬顿氧化法与 BAF 反应器的协同组合可在较低剂量的芬顿试剂下提供 EfOM 的理想矿化效率（>70%）。研究结果表明，芬顿氧化法与 BAF 反应器联用是处理 IPWTP 二级出水中 EfOM 的一种很有前途的策略。本研究为实际应用中 IPWTP 二级出水中 EfOM 的特性分析和深度处理提供了指导。
