膜吸收从废水中脱氨的研究  

STUDY OF MEMBRANE ABSORPTION PROCESS ON SEPARATING AMMONIA FROM WASTEWATEr

作　　者：齐麟[1] 吕晓龙[1] 贾悦[1] 

机构地区：[1]天津工业大学,天津300160

出　　处：《水处理技术》2008年第5期7-10,28,共5页Technology of Water Treatment

基　　金：天津市重大科技攻关项目(05YFGDGX10000)

摘　　要：利用自制疏水聚偏氟乙烯(PVDF)中空纤维膜组件对氨/水分离过程中的影响因素进行了研究。考察膜两侧液体流速、pH值、温度等因素对膜吸收过程传质系数和氨去除率的影响。研究结果表明膜吸收法对废水中的氨有很高的去除率(90%以上)。适当提高原料液的温度、流速和pH值都会显著提高氨的传质效率。吸收液侧硫酸的温度、流速对传质影响很小,相对于原料液侧各参数的影响可以忽略,而吸收液的pH应小于4才能获得较好的吸收效果。此外,使用外压式组件可以利用其较大的传质面积获得较内压式更高的氨去除率,而不同的组件放置方式对膜吸收脱氨的效果并无明显影响。The impact of additives montmoriUonite （MMT） and LiCl on PVDF membrane performance was studied. As it can be seen that the two addi- tion particles caused a strong increase of the viscosity, which is helpful to the taking shape of membrane. The pseudoplastic fluid characteristic has been showed in PVDF/MMT/DMAC. Viscosity of PVDF / LiCl/DMAC fluid agrees with the characteristic of the Expansibility fluid well. At the same time addition have some influence on the membrane formation. It can be seen from the phase diagram that two additions shift the binodal＇s position and the water tolerance decreased. LiCl can cause the function of congealing more strongly than MMT as the additive. The max retention of PEG20000 and oil/water mixture is amount to 95.2%, 90.56% in Right amount of matching; The DSC curves showed that in the MMT/PVDF composite membrane of the crystal degree was less than that of LiCI/PVDF. The former heat stability of is better that the latter from TG picture＇s.

关 键 词：膜吸收 废水脱氨 聚偏氟乙烯中空纤维膜 

分 类 号：TQ028.8[化学工程]