Innovative slow-release organic carbon-source material for groundwater in situ denitrification

Zhang, Dayi and Zhang, Xu and Wang, Yun and Zhou, Guizhong and Li, Guanghe (2015) Innovative slow-release organic carbon-source material for groundwater in situ denitrification. Environmental Technology, 36 (7). pp. 909-919. ISSN 0959-3330

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Slow-release organic carbon-source (SOC) material, a new kind of electron donor for in situ groundwater denitrification, was prepared and evaluated in this study. With starch as a biologically utilized carbon source and polyvinyl alcohol (PVA) as a frame, this material performed controllable carbon release rates and demonstrated stable behaviour during the simulated denitrification process. Raman spectrum analysis showed that the PVA skeleton formed cross-linking network structures for hydrogen-bonded water molecules reset in low temperatures, and the starchy molecules filled in the interspace of the skeleton to form a two-phase interlocking/disperse phase structure. In a static system, carbon release processes followed the Fickian law with (1.294-6.560) × 10(-3) mg g(-1) s(-1/2) as the release coefficient. Under domestication and in situ groundwater simulation conditions, SOC material played a favourable role during denitrification, with 1.049 ± 0.165 as an average carbon-nitrogen ratio. The denitrification process followed the law of zero-order kinetics, while the dynamics parameter kN was 0.563-8.753 gN m(-3) d(-1). Generally, SOC material was suggested to be a potential carbon source (electron donor) suitable for in situ groundwater denitrification.

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Journal Article
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Environmental Technology
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05 Jan 2015 10:18
Last Modified:
22 Nov 2022 01:26