Groundwater contamination via nitrate leaching has been observed in many countries. The denitrification performance of a poly(3-hydroxybutyrate-co-hydroxyvalerate) (PHBV)–ceramsite-based reactive barrier system was evaluated in continuous upflow bioreactors. Artificial groundwater spiked with nitrate (44.75–57.25 mg NO3−-N/L) was tested under different hydraulic retention times (HRT; 5.2 h and 2.6 h). The continuous experiment for 35 days showed that more than 95% NO3−-N was removed. The maximum denitrification rate was determined to be 241 mg NO3−-N/(L· d), and NO2−-N concentration was below 0.1 mg/L in the effluent at the substrate:ceramsite mass ratio of 1:40. Rapid biodegradation of PHBV granules caused an initial excess release of dissolved organic compound (DOC), and shortening HRT from 5.2 h to 2.6 h can result in a sharp decrease of DOC. The minimum DOC concentrations were determined to be 20–33 mg/L in the effluent when the HRT was set at 2.6 h. So the PHBV granules may be a suitable solid-phase carbon source for enhancing denitrification in nitrate-contaminated groundwater.
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Research Article|
February 25 2017
Denitrification of nitrate-contaminated groundwater in columns packed with PHBV and ceramsites for application as a permeable reactive barrier Available to Purchase
Liangtao Ye;
Liangtao Ye
1College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241000, China
2Chinese Academy of Sciences, Nanjing Institute of Geography and Limnology, Nanjing 210008, China
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Ge Yu;
Ge Yu
2Chinese Academy of Sciences, Nanjing Institute of Geography and Limnology, Nanjing 210008, China
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Shoubiao Zhou;
Shoubiao Zhou
1College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241000, China
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Shengpeng Zuo;
1College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241000, China
E-mail: [email protected]
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Caixia Fang
Caixia Fang
1College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241000, China
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Water Supply (2017) 17 (5): 1241–1248.
Article history
Received:
September 13 2016
Accepted:
February 14 2017
Citation
Liangtao Ye, Ge Yu, Shoubiao Zhou, Shengpeng Zuo, Caixia Fang; Denitrification of nitrate-contaminated groundwater in columns packed with PHBV and ceramsites for application as a permeable reactive barrier. Water Supply 1 October 2017; 17 (5): 1241–1248. doi: https://doi.org/10.2166/ws.2017.024
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