Chen Zhonglin

THM and HAA Formation from Sequential Use Ozone and Monochloramine to Disinfection in the Presence of Tannic Acid

Tannic acid, as a surroguate of natural organic matter (NOM), were used as model compound. A study was conducted to evaluate the main disinfection byproducts of sequential use ozone and monochloramine to disinfection in the presence of tannic acid. Results of Disinfection byproduct formation potential show that the main disinfection byproduct include TCM (trichloromethane) and DCAA(dichloroacetic acid). Smaller anounts of TCAA(trichloroacetic acid) were also found. The production of TCM and DCAA increase significantly with the increase of disinfectant dosage(ozone and monochloramine)and temperature. From pH 7-8, more disinfectant byproducts are produced.

水源水消毒副产物生成势与UV 254 /DOC的相关性研究

使用XAD-4和XAD-8树脂对宜兴3个水源原水中DOM进行亲疏水性分类，采用优化方法测定分类水样的DBPFP，并进行DBPFP与DOM量化指标之间的相关性分析，以确定实际生产过程DBPs生成量的主要影响因素.由三维荧光光谱图得到3个水源原水DOM组成差异较大，水质区别明显.由亲疏水性分类分析发现原水中疏水性和亲水性DOM含量较高，疏水性DOM水样的DBPFP大于原水，得到水样的DBPFP主要取决于DOM与消毒剂反应产生DBPs的效率，而不是DOM的量.引入UV254/DOC这个指标，发现不同分类水样UV254/DOC的差异情况与其DBPFP相吻合，对两者进行回归分析，发现水样THMFP和DHAAFP与UV254/DOC之间存在明显的线性关系，线性可决系数R2分别为0.89和0.85.因此研究减小原水UV254/DOC的技术工艺对于控制给水中DBPs浓度具有重要意义.

Heterogeneous Catalytic Ozonation of P-Chloronitrobenzene Promoted by Waterglass-Supported Zinc Hydroxide in Water Using Continuous Flow Mode

Waterglass-supported zinc hydroxide, a stable and efficient catalyst prepared in the laboratory, has been successfully used in the decomposition of ozone and trace quantities of p-chloronitrobenzene in water in continuous flow test. The decomposition rate of aqueous ozone was increased with the increase of waterglass-supported zinc hydroxide dose, and the ozone decomposition was affect by the solution pH value. Increasing the catalyst adding amount from 0mg/Lto 500mg/L the removal efficiency of p-chloronitrobenzene was from 0 to 97.5%, and the degradation efficiency increasing with the residence time prolonging. Furthermore, the existing HCO3-could inhibit the ozonation process of the p-chloronitrobenzene, the degradation efficiency of p-chloronitrobenzene is between 83% and 42% as the HCO3- concentration in the range of 50–200 mg/L. After 3d continuous stable operation in the continuous flow mode test, the catalyst remained stable in the catalytic ozonation of p-chloronitrobenzene.