000202313 001__ 202313
000202313 005__ 20181203023630.0
000202313 0247_ $$2doi$$a10.1016/j.watres.2014.05.018
000202313 022__ $$a0043-1354
000202313 02470 $$2ISI$$a000340336300025
000202313 037__ $$aARTICLE
000202313 245__ $$aColumn studies to assess the effects of climate variables on redox processes during riverbank filtration
000202313 260__ $$aOxford$$bElsevier$$c2014
000202313 269__ $$a2014
000202313 300__ $$a13
000202313 336__ $$aJournal Articles
000202313 520__ $$aRiverbank filtration is an established technique used world-wide to produce clean drinking water in a reliable and cost-efficient way. This practice is, however, facing new challenges posed by climate change, as already observed during past heat waves with the local occurrence of anoxic conditions. In this study we investigated the effect of direct (temperature) and indirect (dissolved organic matter (DOM) concentration and composition, flow rate) climate change variables on redox processes (aerobic respiration, denitrification and Mn(III/IV)/Fe(III) reduction) by means of column experiments. Natural river water, modified river water and river water mixed with treated wastewater effluent were used as feed waters for the columns filled with natural sand from a river-infiltration system in Switzerland. Biodegradable dissolved organic matter was mainly removed immediately at the column inlet and particulate organic matter (POM) associated with the natural sand was the main electron donor for aerobic respiration throughout the column. Low infiltration rates (<= 0.01 m/h) enhanced the oxygen consumption leading to anoxic conditions. DOM consumption did not seem to be sensitive to temperature, although oxygen consumption (i.e., associated with POM degradation) showed a strong temperature dependence with an activation energy of similar to 70 kJmol(-1). Anoxic conditions developed at 30 degrees C with partial denitrification and formation of nitrite and ammonium. In absence of oxygen and nitrate, Mn(II) was mobilized at 20 degrees C, highlighting the importance of nitrate acting as a redox buffer under anoxic conditions preventing the reductive dissolution of Mn(III/IV)(hydr)oxides. Reductive dissolution of Fe(III)(hydr)oxides was not observed under these conditions. (C) 2014 Elsevier Ltd. All lights reserved.
000202313 6531_ $$aClimate change
000202313 6531_ $$aRedox milieu
000202313 6531_ $$aMicrobial respiration
000202313 6531_ $$aWastewater effluent
000202313 6531_ $$aPOM
000202313 6531_ $$aBDOM
000202313 700__ $$aVon Rohr, Matthias Rudolf
000202313 700__ $$0244343$$aHering, Janet G.$$g178483$$uSwiss Fed Inst Aquat Sci & Technol, EAWAG, CH-8600 Dubendorf, Switzerland
000202313 700__ $$aKohler, Hans-Peter E.$$uSwiss Fed Inst Aquat Sci & Technol, EAWAG, CH-8600 Dubendorf, Switzerland
000202313 700__ $$0245482$$aVon Gunten, Urs$$g210253
000202313 773__ $$j61$$q263-275$$tWater Research
000202313 909C0 $$0252250$$pLTQE$$xU12400
000202313 909C0 $$0252298$$pUPHCE$$xU12328
000202313 909CO $$ooai:infoscience.tind.io:202313$$particle$$pENAC
000202313 917Z8 $$x106743
000202313 937__ $$aEPFL-ARTICLE-202313
000202313 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000202313 980__ $$aARTICLE