再生水地下回灌过程中溶解性有机物的去除研究

在实验室通过模拟方法研究了城市再生水地下回灌后的水质变化,重点分析了土壤含水层处理(SAT)对再生水中溶解性有机物(DOM)及消毒副产物的前体物去除效果.结果表明,在系统稳定时期,SAT对溶解性有机碳(DOC)平均去除率为37.2%.利用XAD树脂分离出再生水中占最主要DOM的3个部分:疏水性有机酸(HPOA)、过渡亲水性有机酸(TPIA)和亲水性有机物(HPI). HPOA、TPIA和HPI在SAT中去除率分别为33.9%、21.5%和44.1%.再生水有较高的消毒副产物生成势(BPDFP),经过SAT后三卤甲烷生成势THMFP和卤乙酸生成势HAAFP分别降低了11.0%和21.5%,但单位质量DOC的BPDFP却升高了,Specific THMFP和Specific HAAFP分别增大了42.4%和25.7%.即经过SAT处理后再生水中的消毒副产物的前体物浓度会减少,但是剩下的难降解的DOM有更高的氯化活性.

Removal of Dissolved Organic Matter During Groundwater Recharge Using Reclaimed Water

Groundwater recharge with reclaimed water has emerged as an integral part of water and wastewater management in arid regions of the world. The objective of this study was to investigate the removal and transformation of dissolved organic matter (DOM) through laboratory-scale soil aquifer treatment (SAT) soil columns. When the system was stable, the DOM average removal was 37.2%.The main DOM was fractionated into 3 fractions by using XAD resins:hydrophobic acid (HPOA), transphilic acid (TPIA) and hydrophilic fraction(HPI). HPOA, TPIA and HPI reduced by 33.9%, 21.5%, 44.1% in laboratory-scale SAT columns, respectively. The reclaimed water had a high disinfection by-products formation potential(DBPFP) during disinfection. SAT reduced the trihalomethane formation potential (THMFP) and the haloacetic acids formation potential (HAAFP) by 11.0% and 21.5% respectively. However, the specific THMFP and specific HAAFP increased by 42.4% and 25.7% respectively. The results indicated that SAT columns could remove the disinfection by-product precursors, but the remaining DOM had higher chlorine reactivity.