Details

Autor(en) / Beteiligte

• Su, Zhiqiang
• Zhang, Yu
• Jia, Xue
• Xiang, Xuemin
• Zhou, Jiti

Titel

Research on enhancement of zero-valent iron on dissimilatory nitrate/nitrite reduction to ammonium of Desulfovibrio sp. CMX

Ist Teil von

• The Science of the total environment, 2020-12, Vol.746, p.141126-141126, Article 141126

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2020

Link zum Volltext

Quelle

ScienceDirect Journals (5 years ago - present)

Beschreibungen/Notizen

• The process of nitrate dissimilation to ammonium (DNRA) is an important way for storing nitrogen in nature and DNRA is a key step in efficient recovery of nitrogen in wastewater. However, in view of the low conversion efficiency of DNRA, zero-valent iron (ZVI) was used to enhance the DNRA process of Desulfovibrio sp. CMX. ZVI can obviously promote the nitrate/nitrite reduction. The experiment indicated that 5 g/L 300 mesh ZVI could convert 5 mmol/L nitrate or nitrite to ammonium in 48 h or 36 h respectively, and the conversion ratio of NO2− to NH4+ could reach more than 90%. The ZVI provided a suitable growth environment for the Desulfovibrio sp. CMX through chemical reduction of nitrite, production of divalent iron (Fe2+), reduction of oxidation-reduction potential (ORP) and adjustment of pH, which strengthened the DNRA performance. This experiment is advantageous for increasing efficiency of DNRA and provides a new idea for efficient recovery of nitrogen resources. [Display omitted] •ZVI is one of the effective additives to enhance the ammonia production performance of SRB.•ZVI can reduce nitrite, produce Fe2+ and H2, reduce ORP and adjust pH.•The combined effect of ZVI and SRB reduced the ORP value.