Abstract This study evaluated the performance of a sequentially coupled UV/H2O2-anoxic system to treat industrial wastewater (IWW). Initial IWW characterization showed a high chemical oxygen demand (COD) load (13,261 mg L−1, 6,880 mg L−1 of total organic carbon (TOC), 569 mg L−1 of total nitrogen (TN), and an alkaline pH (9.1 ± 1.51). Using advanced oxidation processes (AOPs), removal efficiencies of 49.4 % of COD and 85 % of total organic carbon (TOC) were achieved after 60 min of UV-C irradiation (82 W m−2) using a H2O2/COD ratio of 0.78:1. Under these conditions, a 50 % transformation of TN into nitrites and nitrates (NO2+NO3)-N was also observed. After the AOP, the partially treated IWW was mixed with municipal wastewater (MWW) at ratio of 1:10, based on toxicity test results, and then used as the influent of the biological process. The biological process consisted of anoxic suspended and attached biomass coupled sequentially after the UV/H2O2 system. Both biological systems (attached and suspended biomass reactors) efficiently removed (NO2+NO3)-N, achieving 85 % removal of TN, 41.8 % removal of TOC, and 49.2 % removal of COD and denitrification process was found to occur after the AOP through the biological systems. In addition, pH values ranging from 6 to 7.6 were observed after the biological treatment, which suggests that the resulting effluent could be treated using conventional water treatment.

中文翻译：

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使用顺序耦合的 UV/H2O2-生物系统处理高碳和氮含量的工业废水

摘要 本研究评估了连续耦合 UV/H2O2-缺氧系统处理工业废水 (IWW) 的性能。初始 IWW 表征显示高化学需氧量 (COD) 负荷（13,261 mg L-1、6,880 mg L-1 总有机碳 (TOC)、569 mg L-1 总氮 (TN) 和碱性 pH（ 9.1 ± 1.51). 使用高级氧化工艺 (AOP)，在使用 H2O2 的 UV-C 照射 (82 W m-2) 60 分钟后，COD 的去除效率为 49.4 %，总有机碳 (TOC) 的去除效率为 85 % /COD 比为 0.78:1。在这些条件下，还观察到 50% 的 TN 转化为亚硝酸盐和硝酸盐 (NO2+NO3)-N。在 AOP 之后，部分处理的 IWW 与市政废水 (MWW) 混合在1:10 的比例，根据毒性测试结果，然后用作生物过程的进水。生物过程包括在 UV/H2O2 系统之后依次耦合的缺氧悬浮和附着的生物质。两种生物系统（连接式和悬浮式生物质反应器）都有效去除了 (NO2+NO3)-N，实现了 85% 的 TN 去除、41.8% 的 TOC 去除和 49.2% 的 COD 去除和反硝化过程被发现在 AOP 之后发生生物系统。此外，在生物处理后观察到的 pH 值范围为 6 至 7.6，这表明可以使用常规水处理处理产生的污水。发现通过生物系统在 AOP 之后发生了 2% 的 COD 去除和反硝化过程。此外，在生物处理后观察到的 pH 值范围为 6 至 7.6，这表明可以使用常规水处理处理产生的污水。发现通过生物系统在 AOP 之后发生了 2% 的 COD 去除和反硝化过程。此外，在生物处理后观察到的 pH 值范围为 6 至 7.6，这表明可以使用常规水处理处理产生的污水。