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Microbial reduction of nitrate in the presence of zero-valent iron.
Zhang, Yiping; Douglas, Grant B; Kaksonen, Anna H; Cui, Lili; Ye, Zhengfang.
Afiliação
  • Zhang Y; Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
  • Douglas GB; CSIRO Land and Water, Centre for Environment and Life Sciences, Private Bag 5, Wembley, 6913, WA, Australia.
  • Kaksonen AH; CSIRO Land and Water, Centre for Environment and Life Sciences, Private Bag 5, Wembley, 6913, WA, Australia.
  • Cui L; Hebei Energy and Environmental Engineering, Hebei Institute of Architectural Engineering, Zhangjiakou, Hebei 075000, China.
  • Ye Z; Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China. Electronic address: zhengfangye@163.com.
Sci Total Environ ; 646: 1195-1203, 2019 Jan 01.
Article em En | MEDLINE | ID: mdl-30235605
ABSTRACT
Microbial reduction of nitrate in the presence of zero-valent iron (ZVI) was evaluated in anoxic shake flasks to assess the feasibility of ZVI-facilitated biological nitrate removal. Nitrate was completely reduced within 3days in the presence of both ZVI and microorganisms (ZVI-M). In contrast, only 75% of the nitrate was reduced in the presence of ZVI but without microbial inoculum. Nitrate removal was affected by ZVI-M flasks initial pH, nitrate concentration and ZVI dosage. Nitrate removal in the inoculated ZVI flasks system could be divided into two phases adaptation phase and log phase which could be described by first-order kinetic equations. The analysis of bacterial communities in the inoculated flasks in the absence and presence of ZVI, indicated that the addition of ZVI increased the relative abundance of Methylotenera spp., Alcaligenes eutrophus, Pseudomonas spp. which might play an important role in nitrogen removal. The presence of ZVI could enhance biological denitrification through four mechanisms the biological reduction of nitrate with 1) electrons derived directly from ZVI; 2) with hydrogen released from ZVI; 3) with Fe2+ released from ZVI; and 4) with acetate generated by homoacetogens which utilize H2 released from ZVI.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Biodegradação Ambiental / Ferro / Nitratos Idioma: En Ano de publicação: 2019 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Biodegradação Ambiental / Ferro / Nitratos Idioma: En Ano de publicação: 2019 Tipo de documento: Article País de afiliação: China