Research on green aqueous ammonia recovery performance by air gap membrane distillation
Recovering ammonia nitrogen from biogas slurry enables low-cost nitrogen fertilizer production with a low-carbon footprint.In theory,air gap membrane distillation(AGMD)can recover ammonia from biogas slurry in the form of aqueous ammonia solution,but few study documented.This article proposes to explore the recovery performance of aqueous ammonia solution by AGMD.In the single-factor experiment,the influence of air gap thickness,feed temperature,initial total ammonia nitrogen(TAN)concentration,and feed velocity on the ammonia recovery performance from simulated biogas slurry were investigated respectively.The results showed that both ammonia flux and water flux increased with the increase in feed temperature and decreased with the increase in air gap thickness.When the optimal feed velocity was 90 mL/min,both the highest ammonia separation factor and ammonia removal efficiency were obtained.Based on the results of the single-factor experiment,the orthogonal experiment was used to explore the optimal parameters for ammonia recovery by AGMD.The experimental results showed that the optimal conditions were the air gap thickness of 3 mm,the feed temperature of 54 ℃,the initial TAN of 800 mg/L,and the feed velocity of 90 mL/min,wherein the ammonia separation factor was used as the evaluation parameter.
air gap membrane distillationammonia recoverybiogas slurryammonia nitrogenammonia separation factor
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万方数据
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