Department of Chemical Engineering - Postgraduate Program, West Parana State University - UNIOESTE, Rua da Faculdade 645, Jd. La Salle, 85903-000 Toledo, PR, Brazil.
J Environ Manage. 2012 Aug 15;104:1-8. doi: 10.1016/j.jenvman.2012.03.032. Epub 2012 Apr 4.
In this work, the performance of a photo-Fenton process-based textile effluent treatment was investigated using both solar and artificial light sources. A full 3(3) factorial experimental design was applied for the optimisation with respect to three parameters: initial pH, amounts of Fe(2+) (0.01-0.09 g L(-1)) and H(2)O(2) (1-7 g L(-1)). The photo-Fenton process response was evaluated on the basis of chemical oxygen demand (COD) removal and decolourisation. The optimum conditions of the photo-Fenton process were attained at concentration values of 0.05 g Fe(2+) L(-1) and 6.0 g H(2)O(2) L(-1) and pH 3, for both solar and artificial light sources. The effects of initial pH, and Fe(2+) and H(2)O(2) concentrations were evaluated. From the monitoring of TOC, COD, turbidity and decolourisation over time, the progress of the mineralisation of dyes was analysed, forming nitrate, ammonia nitrogen and nitrite. Low amounts of residual peroxide and iron, which were below the limit allowed by Brazilian environmental legislation, were attained after 360 min of irradiation time for both artificial and solar sources. An operational cost of US$ 6.85 per m(3) of treated effluent was estimated using solar irradiation.
本工作采用太阳能和人工光源，研究了光芬顿工艺处理纺织废水的性能。采用完全 3(3) 析因实验设计，对初始 pH 值、Fe(2+)（0.01-0.09 g/L）和 H(2)O(2)（1-7 g/L）用量三个参数进行了优化。基于化学需氧量（COD）去除率和脱色率，对光芬顿工艺的响应进行了评价。对于太阳能和人工光源，光芬顿工艺的最佳条件为 Fe(2+)浓度 0.05 g/L、H(2)O(2)浓度 6.0 g/L、pH 值 3。考察了初始 pH 值、Fe(2+)和 H(2)O(2)浓度的影响。通过对 TOC、COD、浊度和脱色随时间的监测，分析了染料的矿化进程，生成硝酸盐、氨氮和亚硝酸盐。在 360 min 的辐照时间内，无论是人工光源还是太阳能，均能达到残留过氧化物和铁含量低于巴西环境法规允许限量的要求，分别为 6.85 美元/m(3)和 5.56 美元/m(3)。
