焦化废水光催化降解研究

在0.5h和300W高压汞灯紫外光处理条件下,采用TiO2,ZnO和TiO2＋ZnO不同催化剂组合,研究了紫外光催化处理对高浓度焦化废水中CODcr及氨氮去除率的影响。结果表明TiO2是焦化废水中CODcr光降解处理的最佳催化剂;TiO2紫外光能够有效地降低高浓度废水中的CODcr,但对其中氨氮的去除较差。考虑到经济可行性和焦化废水光降解处理的工程实用性,进一步研究了典型焦化厂生化处理站进、出废水按照1L/min处理量施加TiO2紫外光照处理的效果和对废水可生化性的影响,结果表明,短时间的TiO2紫外光照处理焦化废水对降低焦化废水进、出水CODcr和NH3-N的作用十分有限,但可以显著地增加焦化废水进、出水的可生化性。因此该方法可作为焦化废水生化处理站进水预处理和出水深度处理的一项技术。

Study on the Coking Wastewater Photocatalytic Degradation

Under the ultraviolet light treatment condition (300 W high voltage mercury lamp) in 0.5 h, the effect of photocatalytic degradation of high concentration coking wastewater on the removal efficiency of CODcr and NH3-N was studied by using TiO2, ZnO and TiO2 ZnO as photocatalysts. The results indicate that TiO2 is the best catalyst in the CODcr light degradation processing. The TiO2 plus ultraviolet light can effectively reduce CODcr in coking wastewater at high concentration, but the removal efficiency of NH3-N is poor. Considering the economical feasible and the project usability of photocatalytic degradation in the coking water treatment, the influent and the effluent of biochemistry treatment station in the typical coking plant was further studied by treating them under the ultraviolet light by using TiO2 as catalyst. The results indicate that the effect that the influent and the effluent are treated by using ultraviolet light plus TiO2 in a short period to reduce CODcr and NH3-N of it is very limited, but the treating method could obviously increase the BOD5 of the influent and the effluent. Therefore this method should be further studied as a way of the influent pretreatment and the effluent depth treatment in biochemistry treatment station.