In-stream bioreactor for agricultural nitrate treatment

Journal of Environmental Quality
William D Robertson, L Craig Merkley

Abstract

Nitrate from agricultural activity contributes to nutrient loading in surface water bodies such as the Mississippi River. This study demonstrates a novel in-stream bioreactor that uses carbonaceous solids (woodchips) to promote denitrification of agricultural drainage. The reactor (40 m3) was trenched into the bottom of an existing agricultural drainage ditch in southern Ontario (Avon site), and flow was induced through the reactor by construction of a gravel riffle in the streambed. Over the first 1.5 yr of operation, mean influent NO3-N of 4.8 mg L(-1) was attenuated to 1.04 mg L(-1) at a mean reactor flow rate of 24 L min(-1). A series of flow-step tests, facilitated by an adjustable height outlet pipe, demonstrated that nitrate mass removal generally increased with increasing flow rate. When removal rates were not nitrate-limited, areal mass removal ranged from 11 mg N m(-2) h(-1) at 3 degrees C to 220 mg N m(-2) h(-1) at 14 degrees C (n = 27), exceeding rates reported for some surface-flow constructed wetlands in this climatic region by a factor of about 40. Over the course of the field trial, reactor flow rates decreased as a result of silt accumulation on top of the gravel infiltration gallery. Design modifications are c...Continue Reading

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Citations

Oct 11, 2015·Bioresource Technology·Xinqiang LiangGuangming Tian
Nov 20, 2014·Ground Water·Samuel J SmidtTheodore A Endreny
May 7, 2015·Environmental Science and Pollution Research International·Gabriele Weigelhofer, Thomas Hein
Mar 20, 2015·Environmental Science and Pollution Research International·Vaishali Ashok, Subrata Hait
Sep 2, 2014·Environmental Technology·Xiaomei LvChuanbo Xie
Jun 12, 2016·Journal of Environmental Management·Raffaella MeffeIrene de Bustamante
Dec 8, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Derek R FaustScott A Rush
May 3, 2016·Journal of Environmental Quality·Kelly AddyNicole A Ratigan
May 3, 2016·Journal of Environmental Quality·Brandon C GoellerAngus R McIntosh
May 3, 2016·Journal of Environmental Quality·Tahina ChoudhuryDarryl S Finnigan
Jan 2, 2014·Journal of Transcultural Nursing : Official Journal of the Transcultural Nursing Society·Ferruh Niyazi AyoǧluFunda Veren
Aug 15, 2020·Critical Reviews in Biotechnology·Hua ZhongHojae Shim
Aug 27, 2011·Journal of Environmental Quality·Rita ShihDavid L Rudolph
Oct 6, 2015·Journal of Environmental Quality·Natasha BellRobert Hudson
Dec 8, 2015·Journal of Environmental Quality·Robert S Stelzer
Jul 20, 2018·Journal of Environmental Quality·Marta B RoserJessica Gutknecht
Jun 27, 2019·Environmental Science and Pollution Research International·Beibei ZhouLinzhang Yang
Apr 6, 2019·Journal of Environmental Quality·Rachel L NifongMatthew T Moore
Oct 4, 2016·Journal of Environmental Quality·Jacob BruunCharlotte Kjaergaard
Jul 17, 2020·Environmental Science and Pollution Research International·Jitka MaláZuzana Bílková
Aug 11, 2018·The Science of the Total Environment·Michal ŠerešTereza Hnátková
Nov 28, 2017·Journal of Environmental Management·Shiyang LiRabin Bhattarai
Apr 12, 2021·Journal of Environmental Management·Carolina Díaz-GarcíaJosé Álvarez-Rogel
Aug 11, 2018·Environmental Science & Technology·Skuyler P HerzogJohn E McCray

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