The aim of current investigation was to demonstrate the effectiveness of Degussa P-25 titania in the photocatalytic treatment of sewage, discharged from industrial estate, as a combined process under solar irradiation. The study was aimed to understand the role of fundamental factors including, titania load, initial COD level, and pH on the photocatalytic degradation rate. The commercially produced TiO₂ represented a mesoporous structure, 2-30 nm, indicating the adequate activity in the COD reduction of sewages collected from the streams entreating anaerobic, aerobic, and sand filtration stages when 0.5 g L^-1 of photocatalyst was loaded. According to the obtained results, the degradation rate is accelerated with an increase in the initial COD level. Although the solar treatment of streams entering to the anaerobic, and aerobic stages indicated the higher rates, the separation of titania particles from the sludge is very difficult. Therefore, it seems that the downstream of recovery network is still the best position to assemble the photocatalytic system, as an auxiliary process to reduce COD below the standard level, and improve the recovery rate. The maximal removal efficiency, 87%, was achieved within 20 min by the solar treatment of sewage in the alkali condition with the control of pH around 8.

当前研究的目的是证明Degussa P-25二氧化钛作为一种联合工艺，在阳光照射下对从工业区排放的污水进行光催化处理的有效性。这项研究旨在了解二氧化钛负载量，初始COD水平和pH值等基本因素对光催化降解速率的作用。商业生产的TiO ₂表示2-30 nm的中孔结构，表明当0.5 g L ^-1时，从进入整个厌氧，好氧和砂滤阶段的水流收集的污水在COD还原中具有足够的活性。装入了光催化剂。根据获得的结果，降解速率随着初始COD水平的增加而加速。尽管对进入厌氧和好氧阶段的流进行日光处理显示出更高的速率，但是从污泥中分离二氧化钛颗粒却非常困难。因此，回收网络的下游似乎仍然是组装光催化系统的最佳位置，作为将COD降低到标准水平以下并提高回收率的辅助过程。通过在碱性条件下控制pH值约8，对废水进行日光处理，在20分钟内可达到87％的最大去除效率。