摘要
采用人工配制废水系统地研究了特种聚丙烯膜脱氨过程中各项参数对传质性能的影响,并考察了其长期操作稳定性。结果表明,温度从25.1℃降到5.2℃时,氨的总传质系数减小44.7%;反应液pH从9.5提升到11.5,氨的总传质系数增大8倍;以反应液1次过膜的连续处理方式运行,膜组件中氨总传质系数基本保持不变,而以循环反应液的处理方式运行时,膜组件中氨总传质系数逐渐降低;随Na_2SO_4的质量浓度从16.7 g/L升高至150.3 g/L,氨总传质系数提升14.6%,水的伴随渗透蒸馏通量从正值变为负值;在稳定性实验中,用该特种聚丙烯膜处理NH_(3^-)N的质量浓度为4 g/L的配制废水,持续稳定的运行了32 d,NH_(3^-)N去除率保持在95%以上,氨的总传质系数稳定在3.7~4.4μm/s,并且没有发生泄露现象。
The experiments were carried out to study the effect of various parameters on the transfer performance, and the experimental feasibility was identified.The results demonstrated that as the temperature decreased from 25.1 ℃ to 5.2 ℃, the overall transfer coefficient decreased by 44.7%. In addition, increasing pH from 9.5 to 11.5 resulted in 800% enhancement in the overall transfer coefficient. The reaction solution through the membrane of a continuous process run, the overall transfer coefficient remained unchanged. When circulated the reaction solution, however, the overall mass transfer coefficient decreased gradually. With the mass concentration of Na_2SO_4 increased from 16.7 g/L to 150.3 g/L, the overall transfer coefficient increased by 14.6% and the permeate flux turned from positive to negative. In the stability experiment, with mass concentration of ammonia was 4 g/L, the polypropylene hollow fiber membrane run 32 d stably, ammonia removal rate remained above 95%, the overall mass transfer coefficient stabilized between 3.7～4.4 μm/s, and the leak phenomenon was not observed.
出处
《水处理技术》
CAS
CSCD
北大核心
2016年第5期23-27,共5页
Technology of Water Treatment
关键词
聚丙烯中空纤维膜
膜吸收
含硫酸钠高氨氮含量废水
polypropylene hollow fiber membrane
membrane absorption
high ammonia wastewater containing sodium sulfate
