Effects of effluent organic matter characteristics on the removal of bulk organic matter and selected pharmaceutically active compounds during managed aquifer recharge: Column study
Sharma, Saroj K.
Abel, Chol D T
Amy, Gary L.
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AbstractSoil column experiments were conducted to investigate the effects of effluent organic matter (EfOM) characteristics on the removal of bulk organic matter (OM) and pharmaceutically active compounds (PhACs) during managed aquifer recharge (MAR) treatment processes. The fate of bulk OM and PhACs during an MAR is important to assess post-treatment requirements. Biodegradable OM from EfOM, originating from biological wastewater treatment, was effectively removed during soil passage. Based on a fluorescence excitation-emission matrix (F-EEM) analysis of wastewater effluent-dominated (WWE-dom) surface water (SW), protein-like substances, i.e., biopolymers, were removed more favorably than fluorescent humic-like substances under oxic compared to anoxic conditions. However, there was no preferential removal of biopolymers or humic substances, determined as dissolved organic carbon (DOC) observed via liquid chromatography with online organic carbon detection (LC-OCD) analysis. Most of the selected PhACs exhibited removal efficiencies of greater than 90% in both SW and WWE-dom SW. However, the removal efficiencies of bezafibrate, diclofenac and gemfibrozil were relatively low in WWE-dom SW, which contained more biodegradable OM than did SW (copiotrophic metabolism). Based on this study, low biodegradable fractions such as humic substances in MR may have enhanced the degradation of diclofenac, gemfibrozil and bezafibrate by inducing an oligotrophic microbial community via long term starvation. Both carbamazepine and clofibric acid showed persistent behaviors and were not influenced by EfOM. © 2012 Elsevier B.V.
SponsorsWe would like to acknowledge the help of Theo van der Kaaij and Ineke van der Veer-Agterberg (Het Waterlaboratorium) for their support with LC-OCD and ATP measurements. We would like to express our gratitude to Dr. Sacher from TZW: DVGW-Technologiezentrum Wasser for PhAC measurements. This work was financially supported by the EU SWITCH project no. 018530-2 under the Sixth Framework Programme and by the Korea Ministry of Environment as "The Eco-Innovation project (Global Top project)" 2012001090001.
JournalJournal of Contaminant Hydrology
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