Resource extraction of nitrate in water based on resin enrichment-electrocatalytic reduction-membrane stripping synergy system
In view of the low concentration of nitrate pollution and the technical requirements of nitrogen recycling,the foam Fe2O3-x catalytic cathode was synthesized by the electric reconfiguration strategy,and a coupling reaction system of high-efficiency and low-energy-consumption ion exchange process-electro catalytic nitrate reduction-ammonia nitrogen stripping recovery was constructed.The enrichment effect of the ion exchange resin could obtain a high concentration of nitrate regenerator for efficient electrocatalytic reduction of ammonia,and then the hydroxide generated by the nitrate reduction reaction was used to regenerate the anion exchange resin,thus avoiding the use of a large number of agents while achieving efficient electrocatalytic reduction.The introduction of ion exchange technology improved the electrocatalytic NO3-reduction capability of the IE-EC-MC system,and significantly reduced the energy consumption of the system.The results showed that at a current density of 20mA/cm2,the NO3--N removal rate after treatment reached 98%,and the ammonia nitrogen recovery rate,ammonia production rate,and Faraday efficiency were 81%,0.67mg N/(cm2·h),and 53%,respectively.The energy consumption for ammonia recovery was only 19.78kWh/kg(NH4)2SO4.This study provided new ideas for low concentration nitrate pollution and nitrogen resource utilization processes.
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