不同臭氧生物活性炭工艺对二氯乙腈前体物的去除效能

Efficiency of Dichloroacetonitrile Precursor Removal by Different Ozone-Biological Activated Carbon(O3-BAC)Processes

以典型的含氮消毒副产物(N-DBPs)--二氯乙腈(DCAN)为例,研究臭氧-上向流生物活性炭(O3-UBAC)工艺和臭氧-下向流生物活性炭(O3-DBAC)工艺的去除效能差异,并结合DON、分子量分布、亲疏水性和三维荧光光谱探究其差异机理。结果表明,O3-UBAC工艺对DCAN生成势(DCANFP)、DON、分子量<3 kDa的有机物、亲疏水性有机物,以及芳香族蛋白质和类可溶性生物产物有机物的平均去除率分别为58.31%、61.60%、49.22%、46.60%、62.17%和82.08%,而O3-DBAC工艺对相应指标的平均去除率分别为48.72%、50.79%、21.16%、27.32%、47.37%和43.04%。因此,O3-UBAC工艺比O3-DBAC工艺对DCAN前体物的净化效能要好。

Taking a typical nitrogenous disinfection byproducts(N-DBPs)--dichloroacetonitrile(DCAN)as an example,the difference in removal efficiency between ozone-upflow biological activated carbon(O3-UBAC)process and ozone-downflow biological activated carbon(O3-DBAC)were investigated,and the mechanism of differences was explored by combining dissolved organic nitrogen(DON),molecular weight(MW)distribution,hydrophobicity and emission matrix fluorescence spectra.The results showed that average removal efficiencies of DCAN formation potential(DCANFP),DON,organic matters with molecular wt.<3 kDa,hydrophilic organic matters,aromatic proteins and soluble microbial products by UBAC process were 58.31%,60.60%,49.22%,46.60%,62.17% and 82.08%,while removal efficiencies of corresponding indexes by DBAC process were 48.72%,50.79%,21.16%,27.32%,47.37% and 43.04%respectively.Therefore,O3-UBAC process is more efficient than O3-DBAC process.