Natural organic matter (NOM) removal and structural changes in the bacterial community during artificial groundwater recharge with humic lake water

Kolehmainen, Reija E.; Langwaldt, Jörg; Puhakka, Jaakko A.

doi:10.1016/j.watres.2007.02.042

Cited by 45 publications

(26 citation statements)

References 30 publications

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“…Indeed, microbial biomass in the soil, vadose zone, and hyporheic zone was found to decrease along subsurface flowpaths in which DOC declined (Marmonier et al 1995;Holden and Fierer 2005;Rauch-Williams and Drewes 2006). Kolehmainen et al (2007) showed that the number of freeliving bacteria decreased from 15 to less than 2×10 5 ml −1 of water as the DOC concentration of infiltrating water was reduced from 14 to 2 mg l −1 during AGR with lake water.…”

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confidence: 98%

“…Increased DOC supply during stream and lake water infiltration was also found to stimulate respiratory and extracellular microbial activities implicated in organic matter processing (Miettinen et al 1996;Findlay et al 2003;Kolehmainen et al 2009) and modified the composition of bacterial communities (Kolehmainen et al 2007). However, most studies examining the effect of AGR focused on freeliving bacteria (Miettinen et al 1996;Kolehmainen et al 2009).…”

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confidence: 99%

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Response of sediment biofilm to increased dissolved organic carbon supply in groundwater artificially recharged with stormwater

et al. 2010

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Purpose Best management practices encompass diverse artificial groundwater recharge (AGR) systems that heavily rely upon the capacity of the soil and vadose zone to retain large quantities of organic matter generated during stormwater runoff on urban catchments. However, the supply of stormwater-derived dissolved organic carbon (DOC) at the water-table region of aquifers can enhance the rate of biogeochemical processes by fueling heterotrophic microbial metabolism. This study examined changes in the abundance and activity of sediment biofilm in response to increased DOC supply at the water table of an urban aquifer intentionally recharged with stormwater. Changes in microbial abundance and activity under field conditions were compared with those measured in laboratory slow filtration columns supplied with an easily biodegradable source of DOC. Materials and methods Biomass and activities of attached bacteria were measured on aquifer sediment samples collected at multiple depths below the groundwater table. The same microbial variables were measured on aquifer sediments introduced in slow filtration columns supplied with three distinct concentrations of biodegradable dissolved organic carbon (0.5, 1.5, and 2.5 mg l −1 of C-acetate). Results and discussion Biofilm was significantly more abundant and active beneath AGR sites than at control sites not intentionally recharged with stormwater. Individual cells also exhibited higher specific dehydrogenase and hydrolytic activities, and the protein content of biofilm was significantly increased by AGR with stormwater. The stimulation of the microbial community was all the more pronounced when the flux of DOC reaching the groundwater table was high. However, the increase in microbial biomass and activity at AGR sites was 7.5 times lower than that measured in slow filtration columns in which aquifer sediments were supplied with an easily biodegradable source of DOC. Conclusions Our results indicated that the soil and vadose zone at AGR sites efficiently retained the more labile fraction of DOC, thereby enabling the infiltration of large quantities of stormwater without excessively stimulating the growth of microbial biofilm in groundwater. However, our results showed that groundwater bacterial activity was stimulated by enhanced DOC fluxes. As microorganisms experience severe organic carbon limitation in most pristine aquifers, we suggest that groundwater biofilms could be used as sensitive indicators for assessing the DOC fluxes reaching aquifers.

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Response of sediment biofilm to increased dissolved organic carbon supply in groundwater artificially recharged with stormwater

et al. 2010

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“…MAR systems planning is based on hydrogeology and engineering [7]. In drinking water production during a MAR process, NOM is removed by physical, chemical, and microbial processes [8][9][10]. In addition, possible cyanobacteria, including microcystins, are effectively removed in MAR [11].…”

Section: Introductionmentioning

confidence: 99%

Raw Water Quality and Pretreatment in Managed Aquifer Recharge for Drinking Water Production in Finland

Jokela¹,

Eskola

Heinonen³

et al. 2017

Water

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Abstract:The main objective of managed aquifer recharge (MAR) in Finland is the removal of natural organic matter (NOM) from surface waters. A typical MAR procedure consists of the infiltration of surface water into a Quaternary glaciofluvial esker with subsequent withdrawal of the MAR treated water from wells a few hundred meters downstream. The infiltrated water should have a residence time of at least approximately one month before withdrawal to provide sufficient time for the subsurface processes needed to break down or remove humic substances. Most of the Finnish MAR plants do not have pretreatment and raw water is infiltrated directly into the soil. The objectives of this paper are to present MAR experiences and to discuss the need for and choice of pretreatment. Data from basin, sprinkling, and well infiltration processes are presented. Total organic carbon (TOC) concentrations of the raw waters presented here varied from 6.5 to 11 mg/L and after MAR the TOC concentrations of the abstracted waters were approximately 2 mg/L. The overall reduction of organic matter in the treatment (with or without pretreatment) was 70%-85%. Mechanical pretreatment can be used for clogging prevention. Turbidity of the Finnish lakes used as raw water does not necessitate pretreatment in basin and sprinkling infiltration, however, pretreatment in well infiltration needs to be judged separately. River waters may have high turbidity requiring pretreatment. Biodegradation of NOM in the saturated groundwater zone consumes dissolved oxygen. Thus, a high NOM concentration may create conditions for dissolution of iron and manganese from the soil. These conditions may be avoided by the addition of chemical pretreatment. Raw waters with TOC content up to at least approximately 8 mg/L were infiltrated without any considerations of chemical pretreatment, which should be evaluated based on local conditions.

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“…Especially, aerobic microbial activities in the upper layer of soil largely contribute to the removal of DOM during SAT (Drewes and Fox, 1999;Kolehmainen et al, 2007). Meanwhile, there were few researchers focused on DOM removal mechanism, based on the material balances, in the upper layer with active DOM removal.…”

Section: Introductionmentioning

confidence: 99%

Removal of Dissolved Organic Matter and Disinfection By-products Formation Potential in the Upper Layer during Soil Aquifer Treatment

Suzuki

Kameda

Takabe

et al. 2015

J. of Wat. & Envir. Tech.

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Objectives of this study are to comprehend the removal characteristics of dissolved organic matter (DOM) and disinfection by-products formation potential (DBPsFP) in the upper layer, which has active microbial activities, of soil aquifer treatment for wastewater reuse. Three columns, in which sand was packed with the height of 5, 10 and 30 cm, respectively, were set, and wastewater effluent was continuously discharged. Dissolved organic carbon (DOC) and DBPsFP were measured in the influent and effluent from the columns. 22.4% of DOC was removed only at the 5 cm thick layer from the surface, and the removal efficiency increased to 40.1% by the 30 cm infiltration. Therefore, it was cleared that DOM was actively removed by the upper layer infiltration, and most DOM removal was attributed to biodegradation. It was found that the removal characteristics of each DBPs precursor by biodegradation in the upper layer were different. Chloroform FP and dibromochloromethane FP were also reduced by biodegradation in the 30 cm infiltration (removal ratio was 34.4 and 29.2%, respectively); meanwhile, bromodichloromethane FP did not decrease.

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Natural organic matter (NOM) removal and structural changes in the bacterial community during artificial groundwater recharge with humic lake water

Cited by 45 publications

References 30 publications

Response of sediment biofilm to increased dissolved organic carbon supply in groundwater artificially recharged with stormwater

Response of sediment biofilm to increased dissolved organic carbon supply in groundwater artificially recharged with stormwater

Raw Water Quality and Pretreatment in Managed Aquifer Recharge for Drinking Water Production in Finland

Removal of Dissolved Organic Matter and Disinfection By-products Formation Potential in the Upper Layer during Soil Aquifer Treatment

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