Wei Liang-Liang, Zhao Qing-Liang, Xue Shuang, Chang Chein-Chi, Tang Feng, Liang Guan-Liang, Jia Ting
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
J Hazard Mater. 2009 Sep 30;169(1-3):1012-21. doi: 10.1016/j.jhazmat.2009.04.045. Epub 2009 Apr 19.
Wastewater effluent collected from the Wenchang Wastewater Treatment Plant (Harbin, China) was used as source water for advanced treatment and reclamation. Since dissolved organic matter (DOM) in the secondary effluent contains a high concentration of trihalomethanes (THMs) precursors, several processes of advanced treatments including granular activated carbon (GAC) adsorption, sand column biodegradation, horizontal subsurface flow wetland (HSFW) treatment, laboratory-scale soil aquifer treatment (SAT) and GAC+SAT were used in this study to compare and differentiate the removal mechanisms of DOM. DOM in the secondary effluent and the treated effluents was fractionated into five classes using XAD resins: hydrophobic acid (HPO-A), hydrophobic neutral (HPO-N), transphilic acid (TPI-A), transphilic neutral (TPI-N), and hydrophilic fraction (HPI). Results showed that HPO-A and HPI were two main fractions of the DOM in the secondary effluent, accounting for 30.0% and 45.5% of the bulk DOM, respectively. HPO-A exhibited higher trihalomethane formation potential (THMFP) and specific THMFP (STHMFP) than HPI during the chlorination process. The order of the dissolved organic carbon (DOC) removal with respect to different advanced treatments was observed to be GAC+SAT>SAT>GAC>sand column>HSFW. As for the DOM removal mechanisms, the advanced treatment processes of GAC adsorption, SAT and GAC+SAT tended to adsorb more HPO-A, HPO-N and TPI-A and could reduce the aromaticity of those DOM fractions efficiently. Correspondingly, the advanced treatment processes of sand column, SAT, HSFW and GAC+SAT removed more HPI and TPI-N through biodegradation and each of the DOM fractions had an increased aromaticity. The removal order of the THMs precursor by the advanced treatment processes was GAC+SAT>GAC>SAT>sand column>HSFW. The adsorption reduced the STHMFP of the DOM fractions effectively, whereas the biodegradation mechanism of the treatments (sand column, SAT, GAC+SAT and HSFW) showed a converse trend. Moreover, the THMFP and STHMFP of the DOM in the HSFW effluent were obviously affected by the DOM derived from the leaves and roots.
从文昌污水处理厂（中国哈尔滨）收集的废水排放物用作深度处理和再生的水源。由于二级出水中的溶解有机物（DOM）含有高浓度的三卤甲烷（THMs）前体，本研究采用了几种深度处理工艺，包括颗粒活性炭（GAC）吸附、砂柱生物降解、水平潜流湿地（HSFW）处理、实验室规模的土壤含水层处理（SAT）和GAC+SAT，以比较和区分DOM的去除机制。使用XAD树脂将二级出水和处理后出水中的DOM分为五类：疏水酸（HPO-A）、疏水中性（HPO-N）、亲脂酸（TPI-A）、亲脂中性（TPI-N）和亲水部分（HPI）。结果表明，HPO-A和HPI是二级出水中DOM的两个主要部分，分别占总DOM的30.0%和45.5%。在氯化过程中，HPO-A比HPI表现出更高的三卤甲烷生成潜力（THMFP）和特定三卤甲烷生成潜力（STHMFP）。观察到不同深度处理对溶解有机碳（DOC）的去除顺序为GAC+SAT>SAT>GAC>砂柱>HSFW。至于DOM的去除机制，GAC吸附、SAT和GAC+SAT的深度处理工艺倾向于吸附更多的HPO-A、HPO-N和TPI-A，并能有效降低这些DOM部分的芳香性。相应地，砂柱、SAT、HSFW和GAC+SAT的深度处理工艺通过生物降解去除更多的HPI和TPI-N，并且每个DOM部分的芳香性都增加了。深度处理工艺对THMs前体的去除顺序为GAC+SAT>GAC>SAT>砂柱>HSFW。吸附有效地降低了DOM部分的STHMFP，而处理（砂柱、SAT、GAC+SAT和HSFW）的生物降解机制则呈现相反的趋势。此外，HSFW出水中DOM的THMFP和STHMFP明显受到来自树叶和树根的DOM的影响。
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