摘要
In order to develop the technologies of saving energy and the efficient utilization of nature resources in manufacturing chemical products from kelp,a series of experiments of the extraction and purification of mannitol(M)in processing wastewater from kelp products were carried out by means of a setup pilot scale device equipped with two spiral wound modules of the polyamide(PA)nanofiltration(NF)membrane with the total effective area of 6.8 m2.The transport phenomena of low molecular weight organics and electrolytes were analyzed.The behaviors of the solute transport in the PA membrane-M-NaCl system were investigated.Also the mechanism of integrative effect considering the preferential penetration and space hinder was developed based on the theory of pore exclusion and Donnan balance.The experiment results showed that the RM of the two modules was in a high level(about 80%)both in the M aqueous solution and in the M-NaCl mixture solution.SNaCl of 69% and 38% for 1# module and 2# module were obtained respectively at the feed of 0.8%(mass),and increased with the increasing NaCl concentration.Hence,M was preserved effectively by the membrane while NaCl permeated through the membrane preferentially.The transport of M and NaCl in the NF process was well consistent with the result predicated onthe mechanismof integrative effect.This work offers the theoretical basis for the engineering development of the purification and concentration of Min kelpindustry by the NF membrane.
In order to develop the technologies of saving energy and the efficient utilization of nature resources in manufacturing chemical products from kelp,a series of experiments of the extraction and purification of mannitol（M）in processing wastewater from kelp products were carried out by means of a setup pilot scale device equipped with two spiral wound modules of the polyamide（PA）nanofiltration（NF）membrane with the total effective area of 6.8 m2.The transport phenomena of low molecular weight organics and electrolytes were analyzed.The behaviors of the solute transport in the PA membrane-M-NaCl system were investigated.Also the mechanism of integrative effect considering the preferential penetration and space hinder was developed based on the theory of pore exclusion and Donnan balance.The experiment results showed that the RM of the two modules was in a high level（about 80%）both in the M aqueous solution and in the M-NaCl mixture solution.SNaCl of 69% and 38% for 1# module and 2# module were obtained respectively at the feed of 0.8%（mass）,and increased with the increasing NaCl concentration.Hence,M was preserved effectively by the membrane while NaCl permeated through the membrane preferentially.The transport of M and NaCl in the NF process was well consistent with the result predicated onthe mechanismof integrative effect.This work offers the theoretical basis for the engineering development of the purification and concentration of Min kelpindustry by the NF membrane.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第11期2843-2848,共6页
CIESC Journal
基金
国家科技支撑计划项目(2007BAD62B05)
浙江工商大学研究生科研创新基金项目(1110XJ1508073)~~
关键词
海带
甘露醇
废水
纳滤
膜分离
kelp
mannitol
wastewater
nanofiltration
membrane separation
