Drying-Rewetting Cycles Affect Nitrate Removal Rates in Woodchip Bioreactors

被引:52
作者
Maxwell, Bryan M. [1 ]
Birgand, Francois [1 ]
Schipper, Louis A. [2 ]
Christianson, Laura E. [3 ]
Tian, Shiying [1 ]
Helmers, Matthew J. [4 ]
Williams, David J. [5 ]
Chescheir, George M. [1 ]
Youssef, Mohamed A. [1 ]
机构
[1] North Carolina State Univ, Dept Biol & Agr Engn, Raleigh, NC 27695 USA
[2] Univ Waikato, Biogeochem & Ecohydrol Res, Hamilton 3216, New Zealand
[3] Univ Illinois, Dept Crop Sci, Champaign, IL 61820 USA
[4] Iowa State Univ, Dept Agr & Biosyst Engn, Ames, IA 50011 USA
[5] US EPA, Durham, NC 27709 USA
关键词
WATER CHEMISTRY MEASUREMENTS; DENITRIFICATION BIOREACTORS; N-MINERALIZATION; CARBON QUALITY; ORGANIC-MATTER; PUMPING SYSTEM; SOIL; DECOMPOSITION; TEMPERATURE; RELEASE;
D O I
10.2134/jeq2018.05.0199
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Woodchip bioreactors are widely used to control nitrogen export from agriculture using denitrification. There is abundant evidence that drying-rewetting (DRW) cycles can promote enhanced metabolic rates in soils. A 287-d experiment investigated the effects of weekly DRW cycles on nitrate (NO3) removal in woodchip columns in the laboratory receiving constant flow of nitrated water. Columns were exposed to continuous saturation (SAT) or to weekly, 8-h drying-rewetting (8 h of aerobiosis followed by saturation) cycles (DRW). Nitrate concentrations were measured at the column outlets every 2 h using novel multiplexed sampling methods coupled to spectrophotometric analysis. Drying-rewetting columns showed greater export of total and dissolved organic carbon and increased NO3 removal rates. Nitrate removal rates in DRW columns increased by up to 80%, relative to SAT columns, although DRW removal rates decreased quickly within 3 d after rewetting. Increased NO3 removal in DRW columns continued even after 39 DRW cycles, with similar to 33% higher total NO3 mass removed over each weekly DRW cycle. Data collected in this experiment provide strong evidence that DRW cycles can dramatically improve NO3 removal in woodchip bioreactors, with carbon availability being a likely driver of improved efficiency. These results have implications for hydraulic management of woodchip bioreactors and other denitrification practices.
引用
收藏
页码:93 / 101
页数:9
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