Optical Brightening Agent (OBA) wastewater (OBAW) has been reported to be highly resistant to biodegradation. In this study, a real OBAW from an industry which was already treated using primary and secondary treatments (residual COD of secondary clarifier overflow (SCO): 3400-3700 mgL-1) was further treated by Fenton's treatment (FT). Zahn-Wellens biodegradability test revealed that using small doses of H2O2 and Fe+2, the biodegradability of SCO improved to 90% as compared to ∼18% without FT. UV-Vis analysis revealed that ca. 80% of initially present OBAs were removed by treatment sequence outlined in this study. Biodegradability study on individual raw wastewaters from four types of OBAs (designated OBA-TS, OBA-DS-U, OBA-HS, and OBA-DS-D) being manufactured at the time of this study, revealed that OBA-TS wastewater was the most biodegradable (>95% biodegradability) followed by OBA-DS-U (∼60%), OBA-HS (∼20%), and OBA-DS-D (<5%). Application of FT improved the biodegradability of these streams as: OBA-DS-U (∼70%), OBA-HS (∼60%), and OBA-DS-D (∼50%). A treatment sequence consisting of waste coal dust (WCD) pretreatment-FT-biodegradation is a novel, economical, and sustainable approach to treating highly recalcitrant OBA wastewater.

中文翻译：

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使用小剂量芬顿试剂显着改善真正的荧光增白剂 (OBA) 废水的生物降解性

据报道，荧光增白剂 (OBA) 废水 (OBAW) 对生物降解具有很强的抵抗力。在本研究中，来自行业的真实 OBAW 已经使用一级和二级处理（二级澄清池溢流的残留 COD (SCO)：3400-3700 mgL-1）进一步通过 Fenton 处理 (FT) 进行处理。Zahn-Wellens 生物降解性测试表明，使用小剂量的 H2O2 和 Fe+2，SCO 的生物降解性提高到 90%，而没有 FT 的生物降解性提高到 18%。UV-Vis 分析表明，大约 80% 的最初存在的 OBA 通过本研究中概述的处理顺序被去除。本研究期间生产的四种 OBA（指定为 OBA-TS、OBA-DS-U、OBA-HS 和 OBA-DS-D）的单个原废水的生物降解性研究，揭示 OBA-TS 废水的生物降解性最强（>95% 的生物降解性），其次是 OBA-DS-U（~60%）、OBA-HS（~20%）和 OBA-DS-D（<5%）。FT 的应用提高了这些流的生物降解性，如：OBA-DS-U（~70%）、OBA-HS（~60%）和 OBA-DS-D（~50%）。由废煤尘 (WCD) 预处理-FT-生物降解组成的处理序列是一种新颖、经济且可持续的处理高顽固 OBA 废水的方法。