Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 214, Issue -, Pages 276-282Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2018.02.078
Keywords
Denitrification; Alkaline treatment; Nitrate removal; N2O/(N-2+N2O) ratio; Quantitative PCR
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Funding
- National Natural Science Foundation of China [41731280]
- National Key Research Project [2016YFC0402810]
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Lignocellulosic agricultural residues were utilized as denitrification carbon substrates to improve the purification capacity of unsaturated soil and alleviate nitrate pollution of groundwater. In this study, corncob and wheat straw were treated by calcium hydroxide to improve biodegradability and enhance denitrification potential. Calcium hydroxide treatment decreased the contents of lignin (i.e., from 16.7 wt % to 15.2 wt% in corncob and from 21.9 wt% to 20.6 wt% in wheat straw), increased potential biodegradable carbon by 4.4-5.3 times, reached complete nitrate removal 7-14 days earlier and decreased N2O/(N2O+N-2) ratios by 85-99%. The results provide an insight into the application of alkali-treated agricultural residues as denitrification carbon sources to alleviate nitrate transport to groundwater and reduce potential greenhouse effect. (C) 2018 Published by Elsevier Ltd.
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