纳米TiO_2光催化-SBR工艺处理印染废水的研究

Dyestuff wastewater treatment by combined photocatalysis and SBR

采用纳米"TiO2光催化-SBR"联合工艺对印染废水进行处理.实验所用装置为自行设计的"TiO2光催化-SBR"装置,利用偶联剂法将纳米TiO2附着于聚丙烯多面小球表面作为催化剂.光催化降解阶段以催化剂使用量、pH值和溶解氧(DO)为因素进行正交实验,最佳处理工况为1000个催化剂填料、pH值为8.0、溶解氧浓度为4.0mg·L-1;在SBR处理阶段主要考察反应器曝气时间以及沉淀时间对处理效果的影响,其最佳曝气时间和沉淀时间分别为2.5h、1h.实验结果表明,最终出水的色度、CODCr和BOD5去除率分别为90%、85%和94%.

TiO2 photocatalysts and SBR combined technology were applied to treat dyestuff wastewater.The catalyst was a polyhedral ball of polypropylene to which TiO2 was chemically coupled.In the photocatalytic stage,an orthogonal experiment was designed to address different factors such as dosages of photocatalyst,pH values,and DO values of the wastewater.The experimental results show that the optimal operating parameters for photocatalytic treatment were 1000 units of catalyst,pH 8.0 and DO 4.0 mg·L^-1.In the SBR stage,the effects of aeration and sedimentation time on the treatment of dyestuff wastewater were investigated and optimized at an aeration time of 2.5 h and a deposition time of 1 h.The removal rates of color,CODCr and BOD5 in the ultimate outlet water were 90%,85% and 94%,respectively.