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Minimizing salinity accumulation via regulating draw solute concentration in a bioelectrochemically assisted osmotic membrane bioreactor.
Cai, Yun; Wu, You; Yang, Yu-Li; Lu, Yu-Xiang; Song, Hai-Liang.
Afiliación
  • Cai Y; School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, China.
  • Wu Y; School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, China.
  • Yang YL; School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, China. Electronic address: ylyang@njnu.edu.cn.
  • Lu YX; School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, China.
  • Song HL; School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, China. Electronic address: hlsong@njnu.edu.cn.
Chemosphere ; 272: 129613, 2021 Jun.
Article en En | MEDLINE | ID: mdl-33465614
A suitable draw solute (DS) concentration in bioelectrochemically assisted osmotic membrane bioreactor (BEA-OMBR) can convert the "negative effect" of salinity accumulation into a "beneficial effect" by using the reverse-fluxed DS as a buffer agent or a carbon source supplement. Herein, the effect of DS concentration from acid buffer solution (i.e., ammonium chloride, NH4Cl), alkaline buffer solution (i.e., sodium bicarbonate, NaHCO3), and organic solution (i.e., sodium acetate, NaOAc) on salinity accumulation was systematically investigated. Salinity accumulation with NaHCO3 DS mainly derived from reversal fluxed sodium ion (Na+, major contributor with DS concentration ≤0.25 M) and bicarbonate ion (main contributor with DS concentration ≥0.50 M): Na+ accumulation could be mitigated by Na+ transport dominant by electrically driven migration (i.e., 21.3-62.1% of reverse-fluxed Na+), and bicarbonate accumulation could be reduced by buffer system. A medium-low concentration of 0.25 M NH4Cl DS had a better performance on current density of 165.0 ± 23.0 A m-3 and COD removal efficiency of 91.5 ± 3.4% by taking advantage that 77.7 ± 1.3% of reverse-fluxed ammonium could be removed by biological treatment and ammonium transport. A high NaOAc DS concentration (i.e., ≥0.05 M) exhibited a higher current density of 145.3-146.0 A m-3 but a lower COD removal efficiency due to the limited carbon source utilization capacity of anaerobic bacteria. Both concentration diffusion (20.9-28.3%) and electrically driven migration (29.5-39.4%) promoted reverse-fluxed Na+ transport to catholyte and thus mitigated Na+ accumulation in the feed/anolyte. These findings have provided an optimal DS concentration for BEA-OMBR operation and thus encourage its further development.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Purificación del Agua / Salinidad Idioma: En Revista: Chemosphere Año: 2021 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Purificación del Agua / Salinidad Idioma: En Revista: Chemosphere Año: 2021 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido