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首页> 外文期刊>Bioresource Technology: Biomass, Bioenergy, Biowastes, Conversion Technologies, Biotransformations, Production Technologies >Use of electrodialysis and reverse osmosis for the recovery and concentration of ammonia from swine manure
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Use of electrodialysis and reverse osmosis for the recovery and concentration of ammonia from swine manure

机译：使用电渗析和反渗透技术从猪粪中回收和浓缩氨

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摘要

This project aimed at producing a concentrated nitrogen fertilizer from liquid swine manure using electrodialysis (ED) and reverse osmosis (RO), as a mean to help resolve the excess nutrient problem faced by many swine producers, and offer an alternative to chemical nitrogen fertilizer production. Different types of ED membranes were evaluated based on the NH4+ transfer rate, current efficiency and membrane stability. A combination of CMB/AMX membranes was retained due to its high NH4+ transfer rate and chemical stability. The maximum total ammonia concentration (NH3-N) achievable by ED wits limited by water transport from the manure to the concentrate compartment, and ammonia volatilization (17%) from the open concentrate compartment. Results suggested that, under the conditions of this experiment, a maximum total NH3-N concentration of about 16 g/L could be reached with the ED system. An ED concentrate (8.7 g/L of total NH3-N) was also fed to TFC-HF reverse osmosis membranes. A mass balance analysis revealed that the RO permeate, which represented 49.6% of the initial volume, contained 8.6% of the ammonia. However, the RO concentrate contained only 66.6% of the initial total NH3-N, suggesting that 21.2% of the ammonia was volatilized during the concentration test with RO membranes. Ammonia concentration in the RO concentrate reached approximately 13 g/L, which is similar to the maximum concentration that could be achieved by ED. These results suggest that the use of ED and RO membranes to recover and concentrate ammonia is potentially interesting but the process must include an approach to minimize ammonia volatilization or trap volatilized ammonia. Crown Copyright (C) 2007 Published by Elsevier Ltd. All rights reserved.
机译：该项目旨在通过电渗析（ED）和反渗透（RO）从液态猪粪生产浓缩氮肥，以帮助解决许多猪生产者面临的营养过剩问题，并为化学氮肥生产提供替代方法。根据NH4 +的传输速率，电流效率和膜稳定性评估了不同类型的ED膜。 CMB / AMX膜的组合由于其较高的NH4 +转移速率和化学稳定性而得以保留。 ED机智可实现的最大总氨浓度（NH3-N）受水从粪便向浓缩室的传输以及氨从敞开的浓缩室的挥发（17％）的限制。结果表明，在该实验条件下，ED系统可达到的最大总NH3-N浓度约为16 g / L。 ED浓缩液（总NH3-N为8.7 g / L）也被送入TFC-HF反渗透膜。质量平衡分析表明，RO渗透液（占初始体积的49.6％）含有8.6％的氨。但是，RO浓缩物仅占初始总NH3-N的66.6％，这表明在使用RO膜进行浓度测试期间，有21.2％的氨挥发了。反渗透浓缩物中的氨浓度达到约13 g / L，这与ED所能达到的最大浓度相似。这些结果表明，使用ED和RO膜回收和浓缩氨气可能会引起人们的兴趣，但该工艺必须包括一种减少氨气挥发或捕获挥发的氨气的方法。 Crown版权所有（C）2007，由Elsevier Ltd.发行。保留所有权利。

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