Gebrati L, Idrissi L Loukili, Mountassir Y, Nejmeddine A
.Laboratoire d'Ecotoxicologie, Département de Biologie, Universití Cadi Ayyad, Faculté des Sciences semlalia, BP 2390, Marrakech, Maroc.
Environ Technol. 2010 May;31(6):625-32. doi: 10.1080/09593331003592253.
In Morocco the textile industry, representing 31% of all Moroccan industries, is accompanied by high water consumption and important wastewater discharges rejected without any treatment. The focus of this study was to characterize the effluent from the textile industry, to test separately the effect of UV light and TiO2 catalyst and to determine the optimum conditions (pH, concentration and reaction time) in photocatalytic treatment to reduce chemical oxygen demand (COD) and colour. The biodegradability of the effluent was also studied using a toxicity test before and after treatment. After 90 min of reaction time at pH 4 and with 1.5 g F' of TiO2 catalyst, the photocatalytic treatment reached a global removal rate of 53% for COD and 89% for discoloration of the effluent. The relation BOD5/COD increased from around 0 to 0.3. The effluent became accessible to a biological treatment. The toxicity was studied by the Daphnia magna test over 24 hours. The results have shown the important toxicity of these effluents, which are rich in organic matter and other chemical compounds. After treatment by photocatalytic oxidation, the CI50 24 increased from 3.8% to 22.8%. This reduction of toxicity is related to the reduction of COD (53%) and colour (89%). Photocatalytic treatment has been shown to have an environmental benefit and, in combination with a secondary biological treatment, can be important for a significant reduction in the pollution of textile effluents.
在摩洛哥，纺织业占摩洛哥所有产业的31%，其伴随着高耗水量以及未经任何处理就被排放的大量废水。本研究的重点是对纺织业废水进行特性分析，分别测试紫外线和二氧化钛催化剂的效果，并确定光催化处理中降低化学需氧量（COD）和色度的最佳条件（pH值、浓度和反应时间）。还通过毒性测试研究了处理前后废水的生物降解性。在pH值为4且使用1.5克二氧化钛催化剂的情况下反应90分钟后，光催化处理对废水的COD去除率达到53%，脱色率达到89%。生化需氧量与化学需氧量的比值（BOD5/COD）从约0增加到0.3。废水变得适合进行生物处理。通过大型溞测试对毒性进行了24小时的研究。结果表明这些富含有机物和其他化合物的废水具有很高的毒性。经过光催化氧化处理后，24小时半数致死浓度（LC50）从3.8%提高到22.8%。毒性的降低与COD（53%）和色度（89%）的降低有关。光催化处理已显示出具有环境效益，并且与二级生物处理相结合，对于大幅减少纺织废水污染可能很重要。
