School of the Environment, Nanjing University, Nanjing, China.
Water Sci Technol. 2012;66(2):415-21. doi: 10.2166/wst.2012.137.
In this study, the performance of a typical Chinese industrial nitro-aromatic wastewater project (operational capacity: 3,000 m(3)d(-1)) was evaluated using chemical properties and toxicity data. Additionally, the relationship between the removal of organic pollutants and toxicity reduction was investigated throughout the whole-process wastewater treatment. Current advanced treatment reduced the dissolved organic carbon by 40% compared with biologically treated wastewater effluent (BTWE), but the acute toxicity and early life-stage toxicity increased significantly. For instance, the acute toxicity of the current advanced treated wastewater was 450% greater than that of the untreated BTWE. With the aim of effectively decreasing the toxicity of the effluent, several efficient adsorption technologies were assessed and compared for further treatment of BTWE. Coagulation and/or oxidation coupled with activated carbon adsorption, hypercrosslinked resin adsorption, or MIEX(®) technology was helpful for improving chemical indices and reducing toxicity. Among these adsorption treatment technologies, hypercrosslinked resin adsorption was more effective at removing most of the toxicants than MIEX(®) technology, and it also had better regeneration efficiency and mechanical properties compared with activated carbon. Therefore, hypercrosslinked resin adsorption may be a promising technology for enhancing organic pollutant removal and toxicity reduction of BTWE from nitro-aromatic factories.
本研究采用化学性质和毒性数据评估了一个典型的中国工业硝基芳香族废水项目（运行能力：3000m3/d）的性能。此外，还研究了整个过程废水处理中有机污染物去除与毒性降低之间的关系。与经生物处理的废水（BTWE）相比，当前的高级处理将溶解有机碳降低了 40%，但急性毒性和早期生命阶段毒性显著增加。例如，当前高级处理废水的急性毒性比未经处理的 BTWE 高 450%。为了有效降低废水的毒性，评估并比较了几种高效吸附技术，以进一步处理 BTWE。混凝和/或氧化与活性炭吸附、超高交联树脂吸附或 MIEX(®)技术相结合有助于改善化学指标并降低毒性。在这些吸附处理技术中，与 MIEX(®)技术相比，超高交联树脂吸附更有效地去除了大部分有毒物质，并且与活性炭相比，其再生效率和机械性能更好。因此，超高交联树脂吸附可能是增强从硝基芳香族工厂中去除 BTWE 中的有机污染物和降低毒性的有前途的技术。
