Effects of effluent organic matter characteristics on the removal of bulk organic matter and selected pharmaceutically active compounds during managed aquifer recharge: Column study
- Effects of effluent organic matter characteristics on the removal of bulk organic matter and selected pharmaceutically active compounds during managed aquifer recharge: Column study
- Sung Kyu Maeng; Saroj K. Sarma; Chol D.T. Abel; Aleksandra Magic-Knezev; 송경근; Gary L. Amy
- Effluent organic matter; Managed aquifer recharge; Pharmaceutically active compounds; Redox conditions
- Issue Date
- Journal of contaminant hydrology
- VOL 140-141, 139-149
- Soil 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.
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