不同材质粉末炭对三氯乙醛及其前体物的吸附效能

为了提高饮用水水质安全保障水平,分别以三氯乙醛(CH)水溶液和南方某水库水为研究对象,考察了木质、煤质和椰壳等3种粉末活性炭(PAC)对CH及其前体物的控制效果,并采用三维荧光光谱(3D-EEM)对水中的溶解性有机物(DOM)进行表征。结果表明,3种PAC对CH均有良好吸附作用,最优投加量为60mg/L,去除率分别为77.46%、7&22%和81.36%;3种PAC在反应初期(0-0.25h)对CH的吸附速率最快,吸附1.0h后PAC吸附趋于饱和状态;椰壳PAC对CH前体物的去除效果稍优于木质和煤质PAC,最优投加量为30mg/L,此时去除率为61.39%,而木质和煤质PAC最优投加量均为50mg/L,相应的去除率分别为62.22%和5&06%。3D-EEM分析显示.PAC主要通过吸附水中的芳香性蛋白质类有机物和微生物代谢产物来控制三氯乙醛生成势(CHFP).

Adsorption Efficiency of Chloral Hydrate and Its Precursors by Powdered Activated Carbon with Different Materials

In order to improve the quality safety guarantee level of drinking water, removal of chloral hydrate ( CH) and its precursors by the powdered activated carbon ( PAC ) of wood, coal and coconut shell were studied for CH aqueous solution and water from a southern reservoir, and the dissolved organic matter ( DOM ) in the water was characterized by three?dimensional fluorescence spectroscopy (3D-EEM). The results showed that all three kinds of PAC had good adsorption effect on CH, and the optimal dosage was 60 mg/L, with removal rates of 77.46%, 78. 22% and 81.36%, respectively. The adsorption rate of the three kinds of PAC to CH was the fastest at the initial stage of adsorption reaction (0 -0. 25h), and PAC adsorption tended to be saturated after the adsorption reaction time reached 1.0 h. In addition, the removal effect of coconut shell PAC on CH precursors was slightly better than that of wood and coal PAC , and the removal rate reached 61.39% under the dosage of 30 mg/L. While the optimal dosage of wood and coal PAC was 50 mg/L, the removal rates were 62. 22% and 58. 06% respectively. Moreover, 3D-EEM analysis indicated that why chloral hydrate formation potential( CHFP) was controlled by PAC adsoiption was the removal of aromatic protein and microbial product in the water.