Optimization of the chemolithotrophic denitrification of ion exchange concentrate using hydrogen-based membrane biofilm reactors

Matias Cruces, José Suárez, Iván Nancucheo, Alex Schwarz*

*Autor correspondiente de este trabajo

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

1 Cita (Scopus)

Resumen

A H2-based membrane biofilm reactor (MBfR) was used to remove nitrate from a synthetic ion-exchange brine made up of 23.8 g L−1 NaCl. To aid the selection of the best nitrate management strategy, our research was based on the integrated analysis of ionic exchange and MBfR processes, including a detailed cost analysis. The nitrate removal flux was not affected if key nutrients were present in the feed solution including potassium and sodium bicarbonate. Operating pH was maintained between 7 and 8. By using a H2 pressure of 15 psi, a hydraulic retention time (HRT) of 4 h, and a surface loading rate of 13.6 ± 0.2 g N m−2 d−1, the average nitrate removal flux was 3.3 ± 0.6 g N m−2 d−1. At HRTs of up to 24 h, the system was able to maintain a removal flux of 1.6 ± 0.2 g N m−2 d−1. Microbial diversity analysis showed that the consortium was dominated by the genera Sulfurimonas and Marinobacter. The estimated cost for a 200 m3/h capacity, coupled ion exchange (IX) + MBfR treatment plant is 0.43 USD/m3. This is a sustainable and competitive alternative to an IX-only plant for the same flowrate. The proposed treatment option allows for brine recycling and reduces costs by 55% by avoiding brine disposal expenses.

Idioma originalInglés
Número de artículo119283
PublicaciónJournal of Environmental Management
Volumen348
DOI
EstadoPublicada - 2023

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© 2023

Áreas temáticas de ASJC Scopus

  • Ingeniería ambiental
  • Gestión y eliminación de residuos
  • Gestión, supervisión, políticas y leyes

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