改性蜂窝陶瓷催化臭氧氧化净水效能中试研究

Pilot research on modified ceramic honeycomb catalytic ozonation in drinking water purification

通过中试考察了改性蜂窝陶瓷催化臭氧氧化(催化氧化)—活性炭过滤的净水效果,并与臭氧—活性炭工艺进行比较。试验条件下蜂窝陶瓷催化剂在静态和动态条件下均不会促进气体向水中的传质;静态条件下催化氧化对水中有机物的去除效率比臭氧单独氧化高;动态试验中,催化氧化对UV254的去除率高于臭氧氧化,但对TOC的去除没有优势,与臭氧氧化相比催化氧化有利于后续活性炭对有机物的去除。GC/MS测定表明,催化氧化及其后续活性炭出水中半挥发性有机物种类分别比臭氧单独氧化少9%和32%。经Ames试验发现,两种氧化及其后续活性炭处理后水的致突变活性均有微小增加。

Pilot-plant of modified ceramic honeycomb catalytic ozonation： granular activated carbon（GAC） filtration was conducted to investigate the water purification effect of this composite process and the oxidation by ozone alone was done along as control experiment. It was proved that the catalyst could not promote air mass transfer to water in both batch and continuous operations. Catalytic ozonation showed higher removal rate on organic matter than ozonation alone in batch experiment; while in the continuous-flow experiment, catalytic ozonation performed better than ozonation alone on UV254 removal, but not in the case of TOC, and catalytic ozonation could increase the water purification efficiency of subsequent GAC comparing with that of ozonation alone. In the result of GC/MS measurement, the content of semi-volatile organic compound in the effluent of catalytic ozonation as well as that of GAC treatment following it was 9% and 32% less than the control experiment respectively. Ames test indicated that oxidation processes and their following GAC treatment increased the mutagenieity of water slightly.