硅酸锌催化臭氧氧化净水效能连续流实验研究

以实验室制备的硅酸锌为催化剂,考察了在连续流实验中催化臭氧氧化对滤后水水质的影响。结果表明,与单独臭氧氧化相比,在相同实验条件下,硅酸锌的存在能够提高水体中的臭氧浓度。硅酸锌催化臭氧氧化对滤后水的总有机碳(TOC)和天然有机物的去除效果均好于单独臭氧氧化。连续运行10 h,硅酸锌催化臭氧氧化系统中TOC的去除效果稳定,并且Zn2+的溶出非常少。生物可同化性有机碳(assimilable organic carbon,AOC)的测定结果表明,经过硅酸锌催化臭氧化处理后,滤后水中的大分子有机物所占比例明显降低,小分子有机物含量增高。GC-MS分析结果表明,单独臭氧氧化可使滤后水中有机物的种类从41种减少到27种;而硅酸锌催化臭氧化效果明显优于单独臭氧氧化可以使水中有机物种类减少到21种。

Continuous-flow study on efficiency of water treatment using zinc silicate catalyzing ozonation

Using zinc silicate prepared in the lab as the catalyst, the impact of catalyzing ozonation on filtered water quality in continuous-flow experiment is studied. The results indicate that, under the same experimental conditions, the existence of zinc silicate can improve the concentration of ozone in water. Using zinc silicate catalyzing ozonation is more efficient than adopting ozonation alone in removing total organic matter(TOC)and natural organic matter in filtered water. During the 10 h continuous run, TOC removal efficiency is kept stable, with little leaching of Zn²⁺ observed in the treated water sample. The assimilable organic carbon(AOC)test results show that the proportion of big molecular organic compounds in the water decreases after the catalytic ozonation process, while the amount of small organic compounds increases. The results of GC-MS indicate that adopting ozonation alone can reduce the kinds of organic compounds from 41 to 27. While adopting zinc silicate catalyzing ozonation can decrease the ultimate number to 21, which shows great more efficiency than using ozonation alone.