Wang Sheng-Jun, Ma Jun, Yang Yi-Xin, Zhang Jing, Qin Qing-Dong, Liang Tao
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2007 Nov;28(11):2520-5.
Changes of the ammonia concentration in Songhua River water treatment using catalyzed ozonation were investigated. Nanosized TiO2 loaded on haydite, silica-gel and zeolite was prepared as the catalyst. The ammonia concentration increased in the first stage, then decreased. After 30 min reaction, the ultimate concentration was close to the initial concentration in ozonation. In catalyzed ozonation which used TiO2/ haydite or TiO2 /silica-gel as the catalyst, the ammonia concentration also increased primarily and then decreased, but the average concentration was higher than that in ozonation alone. In catalyzed ozonation which used TiO2/zeolite as the catalyst, the ammonia concentration decreased primarily, then increased to a peak value, and decreased again. The removal efficiency was close to 80% after 30 min reaction. Effect of ozone dosage, catalyst dosage and temperature were investigated respectively. Increasing the ozone dosage, the maximum of the ammonia concentration appeared ahead and the average concentration of ammonia decreased either in ozonation or in catalyzed ozonation. Increasing the dosage of TiO2 /haydite or TiO2/silica-gel, the average concentration of ammonia increased. The removal efficiency of ammonia benefited from the increase of TiO2/zeolite dosage, but it was affected little when TiO2/zeolite dosage was above 50 g. When the temperature increased from 10 degrees C to 30 degrees C, the changes of ammonia concentration were not affected in catalyzed ozonation using TiO2/haydite or TiO2/silica-gel as the catalyst. While the increase of temperature yielded an increase of ammonia removal efficiency when using TiO2/zeolite as the catalyst.
研究了催化臭氧化处理松花江水过程中氨浓度的变化。制备了负载在陶粒、硅胶和沸石上的纳米TiO₂作为催化剂。氨浓度在第一阶段升高，然后降低。反应30分钟后，臭氧化过程中的最终浓度接近初始浓度。在以TiO₂/陶粒或TiO₂/硅胶为催化剂的催化臭氧化中，氨浓度也先主要升高然后降低，但平均浓度高于单独臭氧化时。在以TiO₂/沸石为催化剂的催化臭氧化中，氨浓度先降低，然后升高到峰值，再降低。反应30分钟后去除效率接近80%。分别研究了臭氧投加量、催化剂投加量和温度的影响。增加臭氧投加量，臭氧化和催化臭氧化中氨浓度的最大值均提前出现且氨的平均浓度降低。增加TiO₂/陶粒或TiO₂/硅胶的投加量，氨的平均浓度升高。氨的去除效率随TiO₂/沸石投加量的增加而提高，但当TiO₂/沸石投加量高于50 g时影响较小。当温度从10℃升高到30℃时，以TiO₂/陶粒或TiO₂/硅胶为催化剂的催化臭氧化中氨浓度的变化不受影响。而以TiO₂/沸石为催化剂时，温度升高会使氨的去除效率提高。
