Methanotrophic contribution to biodegradation of phenoxy acids in cultures enriched from a groundwater-fed rapid sand filter

Abstract

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Different autotrophic enrichments yield efficient inocula for biocathodic applications

“…Enrichments amended with CH 4 were dominated by well-known methane oxidizers; these taxa were previously detected from CH 4 fed column reactors inoculated with sand-filter material (Papadopoulou et al, 2019). Dominant taxa in all enrichments yield over 50% of total community abundance, indicating that they outcompeted the other members, performing the anticipated function.…”

Harnessing biodegradation potential of rapid sand filtration for organic micropollutant removal from drinking water: A review

“…However, RSF performance for OMP removal is variable. Papadopoulou et al (2019) studied the biodegradation of 10 pesticides by MOB in column-scale RSF and found that removal efficiencies for diuron, isoproturon, linuron, 4-chloro-2-methylphenoxy acetic acid and MCPP were between 6.8% and 11.3%; the rest of the compounds (BAM, bromoxynil, cholrotoluron, and ioxynil) were not removed (Papadopoulou et al, 2019). The different elimination behaviors of OMPs in RSF were also verified by another microcosm experiment, where 42%-85% of MCPP, 15%-35% of bentazone, 7%-14% of glyphosate an 1%-3% p-nitrophenol were removed .…”

“…Although above studies show that biodegradation is the most important mechanism of OMPs removal (Table 1), only heterotrophic degraders of geosmin, MIB, BAM and MCPP have been defined in previous investigations (Albers et al, 2015;Elhadi et al, 2006;Feld et al, 2016) (Table 1). In addition, Hedegaard et al (2018) and Papadopoulou et al (2019) find that methanotrophic bacteria can remove OMPs from groundwater, while few investigations focus on the contribution of nitrifying bacteria to OMPs biodegradation in RSF for drinking water production. Thus, future research should include a broader set of OMPs and TPs, especially focusing on field-scale operations, as well as the detailed information of involved microbial populations in OMPs biodegradation in order to fully understand the potential of RSF to biodegrade OMPs.…”

“…In raw groundwater, the concentrations of ammonium and methane are at hundreds mg/L, even several mg/L (Papadopoulou et al, 2019;Tatari et al, 2013). These compounds are typically removed by a combination of aeration and removal by autotrophic nitrifying and methane oxidizing bacteria (Hu et al, 2020;Papadopoulou et al, 2019). In addition to ammonium and methane removal, these autotrophic organisms also show OMPs biotransformation capacity (Batt et al, 2006;Papadopoulou et al, 2019).…”

“…These compounds are typically removed by a combination of aeration and removal by autotrophic nitrifying and methane oxidizing bacteria (Hu et al, 2020;Papadopoulou et al, 2019). In addition to ammonium and methane removal, these autotrophic organisms also show OMPs biotransformation capacity (Batt et al, 2006;Papadopoulou et al, 2019). This co-metabolic conversion results in OMPs removal in RSF treating groundwater.…”