摘要
高氨氮工业废水的处理是羧甲司坦生产过程中亟需解决的问题。采用双极膜电渗析技术(BMED)从废水中回收羧甲司坦并再生盐酸、氨水。考察了电流密度、膜面流速、进料体积比等操作条件对膜堆去除氨氮性能的影响。结果表明,在电流密度50mA/cm^2,膜面流速5cm/s,进料体积比1∶1的条件下,氨氮去除率可达96.3%,电流效率66.7%,能耗4.98kWh/kg。由于氨水是弱电解质,随着浓度的升高,其以游离态形式在膜堆中回迁以及挥发的程度增大,降低了产率和电流效率。在酸、碱隔室中检测到少量的羧甲司坦,表明其在电渗析过程中存在一定程度的泄露,并随着实验运行逐渐加深。
The treatment of industrial carbocysteine effluent with high ammonia nitrogen has become an urgent issue. An experimental study was performed to recover carbocysteine and regenerate hydrochloric acid and ammonia by bipolar membrane electrodialysis （BMED）. The effect of operation conditions on performance of membrane module was studied. The result shows that when the current density is 50 mA/cm^2, the flow rate between membranes is 5 cm/s, the initial volume ratio is 1：1, the removal of NH4^＋ ions reached 96.3%, the current efficiency 66.7% and the energy consumption 4.98 kWh/kg. As a weak electrolyte, NH3· H2O volatilized and diffused .back more heavily when the concentration increased, decreasing the regeneration and current efficiency. Moreover, carbocysteine was detected in the acid and base compartments, which verified the leakage and this leakage gradually increased over time.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2017年第7期131-135,共5页
Environmental Science & Technology
基金
湖北省环境保护专项资助项目(2011HB12)
关键词
双极膜电渗析
羧甲司坦废水
高氨氮
酸碱
bipolar membrane electrodialysis
carbocysteine effluent
high ammonia nitrogen
acid and base
