超重力气提法处理丙烯腈废水

摘要

Aiming at lower removal rate of acrylonitrile in wastewater by air stripping at ambient temperature,it was proposed that high gravity technology enhanced the air stripping process for treatment of acrylonitrile wastewater. The effects of high gravity factor,gas-liquid ratio and initial concentration of acrylonitrile wastewater on removal rate of acrylonitrile were studied and the high gravity single-stage air stripping optimum operating conditions were determined. The removal rate was compared with those of traditional air stripping and stirring methods. Three-stage air stripping removal rate was investigated. Under the operational conditions:high gravity factor of 50,gas-liquid ratio of 1300 at ambient temperature and pressure,initial concentration of acrylonitrile wastewater of (3000± 100)mg/L,the single-stage air stripping removal rate of acrylonitrile was 69.1%,1.6 times and 12 times higher compared with traditional air stripping and stirring methods respectively. Three-stage air stripping removing rate of acrylonitrile was 97.1%. With good economic benefits and prospects,the gas-liquid mass transfer process was enhanced and the target of efficient removal of acrylonitrile in waste water was achieved by high gravity air stripping technology.%基于常温下气提法处理丙烯腈废水去除率低的问题，提出了超重力强化气提法处理丙烯腈废水的研究思路。实验研究了超重力因子β、气液比、丙烯腈模拟废水初始浓度等因素对丙烯腈去除率的影响，确定了超重力单级气提适宜的操作条件，并就去除效果与传统气提法和搅拌法进行对比，着重考察了三级气提后丙烯腈的去除效果。结果表明：在常温、常压、超重力因子β为50.14、气液比为1300的条件下，超重力单级气提丙烯腈废水初始浓度为(3000±100)mg/L时，丙烯腈去除率为69.1%，相近条件下较传统气提法去除率提高了1.6倍，较搅拌法去除率提高了12倍，三级气提时丙烯腈去除率可达97.1%。超重力气提法强化了气液传质过程，实现了废水中丙烯腈的高效去除，具有较高的经济效益和良好的应用前景。