农业机械学报2024，Vol.55Issue(2)：338-345,8.DOI:10.6041/j.issn.1000-1298.2024.02.033
畜禽粪污处理中氨气膜接触器回收的传质及选择性研究
Mass Transfer and Selectivity of Ammonia Recovery Using Membrane Contactor during Manure Treatment
摘要
Abstract
Ammonia recovery from aerobic composting of livestock and poultry manure,or recovery from biogas slurry,can not only reduce pollutant and greenhouse gas emissions,but also obtain nitrogen fertilizer products.Aiming to use hollow fiber membrane absorption process for ammonia gas capture to solve the problems of large equipment volume and poor flexibility in the existing ammonia capture process,air stripping of diluted aqueous ammonia solution was used to prepare ammonia contained air.Then,the simulated ammonia contained air was flowed into hollow fiber membrane contactor,in which ammonia was captured by acid solution flowing in the tube side of the hollow fiber.By analyzing the total ammonium nitrogen concentration in the aqueous ammonia solution and acid solution,the ammonia mass transfer characteristics can be acquired.The results indicated that the mass transfer resistance of ammonia capture was mainly influenced by the gas phase mass transfer resistance and the membrane mass transfer resistance.The gas phase mass transfer resistance dominated at low air flow rates.However,when the air flow rate was increased to 5 L/min,the gas phase mass transfer resistance was decreased by 53.6％compared with that of 0.5 L/min,and the membrane mass transfer resistance dominants.The ammonia capture flux was increased with the elevation of ammonia concentration.Ammonia recovery ratio was above 95％at an air flow rate below 1 L/min,while it was increased to above 99％at air flow rate of 0.5 L/min.The ammonia recovery ratio was only related to the acid absorption capacity if sufficient ammonia retention time was provided.Under the dual influence of temperature and concentration differences,water vapor in the air would transfer into the membrane thus decreasing the product concentration.When the mass fraction of absorbent was 26％,the water transfer flux was 13.3 times higher than that of using 1％sulfuric acid solution.Besides,ammonia separation factor was decreased from 41.6 to 3.06.Acid concentration variation had no significant impact on the mass transfer of ammonia.Literature review showed that the ammonia release concentration in typical manure treatment was basically consistent with the concentration range.The hollow fiber membrane proposed had a wide applicability for capturing ammonia.关键词
粪污处理/氨气/膜吸收/中空纤维膜Key words
manure treatment/ammonia/membrane absorption/hollow fiber membrane分类
农业科技引用本文复制引用
贺清尧,廖婷,陈号迁,刘梦飞,纪龙,晏水平..畜禽粪污处理中氨气膜接触器回收的传质及选择性研究[J].农业机械学报,2024,55(2):338-345,8.基金项目
国家自然科学基金项目(32002222、52076101)和中央高校基本科研业务经费专项资金项目(2662022GXYJ006) （32002222、52076101）
