【作者】 任俊革；

【导师】 谭欣；

【作者基本信息】 天津大学 ， 化学工程， 2004， 硕士

【摘要】 有机磷农药废水因为污染物浓度高，毒性大，可生化性差等特点，一直是废水治理的一个难点。光催化技术作为一种先进的氧化技术，具有氧化能力强，二次污染小，可以没有选择性地将各种污染物最终矿化为无机离子的优点具有光明的前景。但是光催化法同生物法相比它的操作成本相对较高。生物处理法是目前使用的最经济最环境友好的废水处理技术。因此在难降解废水处理领域这两种方法组合处理系统比单一的处理过程更有发展潜力。本文首先进行了光催化降解有机磷农药的研究，对光催化溶液的化学和生物性质进行了分析，比较了几种先进的氧化方法的降解效率。随后对影响光催化效率的因素如，催化剂本身的性质，溶液体系的 pH 值，光催化剂的投加浓度，光强，外加氧化剂等进行了优化。通过测定样品的 BOD5和 COD 得知光催化后，有机磷废水的可生化性得到了提高。在三相流化床生物反应器中进行了连续实验，考察了光催化时间对废水生物处理的影响，实验结果也证明光催化与传统的生化法结合处理难生物降解的有机磷废水是可行的。同时，在间歇式生物反应器中考察了光催化 COD 去除率，光催化段加入 H2O2 对后续生物处理的影响。给出了以 COD 去除表示的动力学方程，证明光催化阶段 COD 的去除符合拟一级反应动力学，生物处理阶段 COD 的去除采用 Monod 方程，实验数据吻合的较好。更多还原

【Abstract】 Organophosphorus pesticides wastewater was characterized as highconcentration of organic matter, high toxicity for biotic systems, biorecalcitrant, so itis always a difficult mission for wastewater disposal. Photocatalysis as an advancedoxidation processes is a very promising methods for its high oxidant power, nosecondary pollution, and no selectivity when completely mineralizing variespollutants to inorganic ions. But the operational costs are relatively high compared tothose of biological treatments, which are, at present, the cheapest and the mostcompatible with the environment. So there are more potential advantages of thecombined process than of the single process in the non-biodegradable wastewatertreatment field. The experiment of photocatalytic degradation of organophosphorus pesticideswas conducted. The chemical and biological characteristics of photocatalytic solutionswere analyzed, and the efficiency of several AOP was compared. Subsequently, theeffect of catalyst, pH, the concentration of catalyst, illumination intensity, H2O2 on thedegradation process was studied and the optimal conditions were found. The result indicates that the biodegradability of photocatalytically treatedorganophosphorus pesticides wastewater was enhanced by measuring the BOD5 andCOD of samples. The sequent experiment was implemented in gas-liquid-solid threephase fludized bed bioreactor to investigate the influence of photocatalytic time on thebiological treatment, and the optimum photocatalytic time were acquired. Theexperimental results also demonstrate that it is possible to combine photocatalysiswith conventional biological treatment for the remedy of wastewater containinggenerally non-biodegradable organophosphorus pesticides. Meanwhile, the effect ofCODCr removal efficiency, and H2O2 added in the photocatalytic on biologicaltreatment was studied in the batch experiment. The kinetic equation, expressed by the COD degradation, is given. Thephotocatalytic degradation kinetics followed pseudo-first order reaction and the CODdegradation Monod equation is employed to achieve kinetics analysis in the biologicaltreatment. The experimental data were much well fitted with the model.更多还原