论文标题
通过顺序电凝 - UV光解过程对制革厂的有效和可持续处理
Efficient and Sustainable Treatment of Tannery Wastewater by a Sequential Electrocoagulation-UV Photolytic Process
论文作者
论文摘要
制革厂废水中包含大量污染物，如果直接排放到生态系统中，则会产生环境危害。本研究将注意力集中在废水的修复上，起源于突尼斯的晒黑皮革。分析表明，废水的高度化学氧需求（COD）为7376 MGO2/L。通过电凝（EC）或紫外光解会降低COD的性能，或者最终检查了序列的工作电凝和光解的性能。电压和反应时间对COD还原的影响以及植物毒性。通过紫外线光谱法分析了处理过的废水，从而提取具有极性不同的有机成分。已证明对制革厂废水的顺序EC和紫外线处理有效地减少了COD。这些治疗总共获得了94.1％的COD减少，而单一EC和UV处理分别提供了85.7和55.9％。最终的COD值为428.7 mg/L，在公共污水网网络中吸收废水的限制远低于1000 mg/L的限制。霍尔加里种子的发芽测试表明，对补救水的毒性降低了。在EC过程中确定了33.33 kWh/m3和314.28 kWh/m3的能源消耗，随后进行了紫外线处理。这两种技术都可以使用，可以进行扩展。
Tannery wastewater contains large amounts of pollutants that, if directly discharged into ecosystems, can generate an environmental hazard. The present investigation has focused the attention to the remediation of wastewater originated from tanned leather in Tunisia. The analysis revealed wastewater with a high level of chemical oxygen demand (COD) of 7376 mgO2/L. The performance in reduction of COD, via electrocoagulation (EC) or UV photolysis or, finally, operating electrocoagulation and photolysis in sequence was examined. The effect of voltage and reaction time on COD reduction, as well as the phytotoxicity were determined. Treated effluents were analysed by UV spectroscopy, extracting the organic components with solvents differing in polarity. A sequential EC and UV treatment of the tannery wastewater has been proven effective in the reduction of COD. These treatments combined afforded 94.1 % of COD reduction, whereas the single EC and UV treatments afforded respectively 85.7 and 55.9 %. The final COD value of 428.7 mg/L was found largely below the limit of 1000 mg/L for admission of wastewater in public sewerage network. Germination tests of Hordeum Vulgare seeds indicated reduced toxicity for the remediated water. Energy consumptions of 33.33 kWh/m3 and 314.28 kWh/m3 were determined for the EC process and for the same followed by UV treatment. Both those technologies are yet available and ready for scale-up.
