Quanrud David M, Hafer Jennifer, Karpiscak Martin M, Zhang Jianmin, Lansey Kevin E, Arnold Robert G
Department of Civil Engineering and Engineering Mechanics, The University of Arizona, Tucson, AZ 85721, USA.
Water Res. 2003 Aug;37(14):3401-11. doi: 10.1016/S0043-1354(02)00489-X.
A 5-year program of study was conducted at the Sweetwater Recharge Facilities (SRF) to assess the performance of surface spreading operations for organics attenuation during field-scale soil-aquifer treatment (SAT) of municipal wastewater. Studies were conducted utilizing both mature (approximately 10 yr old) and new infiltration basins. Removals of dissolved organic carbon (DOC) were robust, averaging >90 percent during percolation through the local 37-m vadose zone. The hydrophilic (most polar) fraction of DOC was preferentially removed during SAT; removals were attributed primarily to biodegradation. Reductions in trihalomethane formation potential (THMFP) averaged 91 percent across the vadose zone profile. The reactivity (specific THMFP) of post-SAT organic residuals with chlorine decreased slightly from pre-SAT levels (60 vs. 72 microg THM per mg DOC, respectively). Variations in the duration of wetting/drying periods did not significantly impact organic removal efficiencies.
在斯威特沃特回灌设施（SRF）开展了一项为期5年的研究项目，以评估城市污水进行现场规模土壤-含水层处理（SAT）期间，地表漫流操作对有机物衰减的性能。研究使用了成熟（约10年历史）和新建的渗滤池。溶解有机碳（DOC）的去除效果显著，在通过当地37米厚的包气带渗流过程中，平均去除率>90%。SAT过程中，DOC的亲水性（极性最强）部分被优先去除；去除主要归因于生物降解。整个包气带剖面中，三卤甲烷生成势（THMFP）的降低平均为91%。SAT后有机残余物与氯的反应性（特定THMFP）比SAT前水平略有下降（分别为每毫克DOC 60微克与72微克三卤甲烷）。湿润/干燥周期持续时间的变化对有机物去除效率没有显著影响。
