School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
J Environ Manage. 2015 Jun 1;156:158-66. doi: 10.1016/j.jenvman.2015.03.049. Epub 2015 Apr 2.
Recycling wastewater treatment plant (WWTP) effluent at low cost via the soil aquifer treatment (SAT), which has been considered as a renewable approach in regenerating potable and non-potable water, is welcome in arid and semi-arid regions throughout the world. In this study, the effect of a coal slag additive on the bulk removal of the dissolved organic matter (DOM) in WWTP effluent during SAT operation was explored via the matrix configurations of both coal slag layer and natural soil layer. Azide inhibition and XAD-resins fractionation experiments indicated that the appropriate configuration designing of an upper soil layer (25 cm) and a mixture of soil/coal slag underneath would enhance the removal efficiency of adsorption and anaerobic biodegradation to the same level as that of aerobic biodegradation (31.7% vs 32.2%), while it was only 29.4% compared with the aerobic biodegradation during traditional 50 cm soil column operation. The added coal slag would preferentially adsorb the hydrophobic DOM, and those adsorbed organics could be partially biodegraded by the biomass within the SAT systems. Compared with the relatively lower dissolved organic carbon (DOC), ultraviolet light adsorption at 254 nm (UV-254) and trihalomethane formation potential (THMFP) removal rate of the original soil column (42.0%, 32.9%, and 28.0%, respectively), SSL2 and SSL4 columns would enhance the bulk removal efficiency to more than 60%. Moreover, a coal slag additive in the SAT columns could decline the aromatic components (fulvic-like organics and tryptophan-like proteins) significantly.
通过土壤-含水层处理（SAT）以低成本回收废水处理厂（WWTP）出水，这在世界范围内的干旱和半干旱地区被认为是一种再生饮用水和非饮用水的可再生方法。在这项研究中，通过煤渣层和自然土层的基质构型探索了煤渣添加剂对 SAT 运行过程中 WWTP 出水中溶解有机物（DOM）的整体去除效果。叠氮化抑制和 XAD-树脂分级实验表明，适当设计上层土壤（25cm）和底层土壤/煤渣混合物可以提高吸附和厌氧生物降解的去除效率，使其与好氧生物降解的去除效率相同（31.7%对 32.2%），而与传统 50cm 土壤柱运行相比，仅为 29.4%。添加的煤渣会优先吸附疏水性 DOM，并且那些被吸附的有机物可以部分被 SAT 系统内的生物量生物降解。与相对较低的溶解有机碳（DOC）相比，原始土壤柱的紫外光吸收 254nm（UV-254）和三卤甲烷生成潜能（THMFP）去除率（分别为 42.0%、32.9%和 28.0%），SSL2 和 SSL4 柱将提高整体去除效率至 60%以上。此外，SAT 柱中的煤渣添加剂可以显著降低芳香族成分（腐殖酸样有机物和色氨酸样蛋白）。
