摘要
谷氨酸钠(NaGA)传统发酵法生产工艺消耗大量酸碱,亦产生大量高浓有机废水.复分解电渗析(EDM)技术以发酵液和硫酸钠等廉价盐为原料一步直接制备NaGA,但其连续化工艺模式和节能降耗仍需进行深入、系统的研究工作.在前期EDM制备NaGA的工作基础上,提出了一次式EDM运行工艺策略,以产品浓度、转化率及能耗等为评价指标,研究了进水流量、产品室/原料室流量比等参数的影响规律,继而构建了一级两段式EDM内部水流工艺.结果表明,在45 mA/cm^(2)电流密度下,原料室进水流量为1.5 L/h、产品室/原料室进水流量比0.6时,常规一次式EDM的产品转化率达73.35%,能耗为1.41 kWh/kg NaGA.进一步地,在优化条件下研究了一级两段式EDM的转化性能,并在相同条件下与一级一段过程比较,在30 mA/cm^(2)电流密度下,一级两段过程产品转化率达89.2%,较同等膜对数下一级一段过程提高11.5%,能耗为2.01 kWh/kg NaGA,较间歇操作模式降低32.6%,优于一级一段EDM过程.
The traditional fermentation process of monosodium glutamate(NaGA)consumed a large amount of acid and base,produced a large amount of hypersaline organic wastewater.Electrodialysis metathesis(EDM)technology can be used to produce NaGA directly using fermentation broth and cheap salts such as sodium sulfate as raw solutions in one step,but its continuous process mode and energy saving still require in-depth and systematic research work.In this paper,a continuous EDM process with one-pass flow strategy was proposed on the basis of the previous work of NaGA production by EDM,and the influence of parameters such as inflow rate and product compartment/raw material inflow rate ratio was studied with product concentration,conversion rate and energy consumption as evaluation indicators,and then a EDM inflow process with two hydraulic stages was constructed.The results showed that when the inflow of the raw materials compartment was 1.5 L/h and the inflow rate ratio of the product to raw materials compartment was 0.6 at the current density of 45 mA/cm^(2),the fermentation conversion ratio of the EDM was 73.35%,and the energy consumption was 1.41 kWh/kg NaGA;furthermore,the conversion of the EDM process with two hydraulic stages was studied under the optimized conditions,and the conversion ratio of the fermentation reached 89.2%,which was 11.5%higher than the EDM process with one hydraulic stage under the conditions of same membrane logarithm,and the energy consumption was 2.01 kWh/kg NaGA at the current density of 30 mA/cm^(2),which was 32.6%lower than that of the batch operation mode.
作者
韩婷
陈青柏
王建友
徐勇
王昊雪
杨泽琨
HAN Ting;CHEN Qingbai;WANG Jianyou;XUYong;WANG Haoxue;YANG Zekun(Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution,College of Environmental Science and Engineering,Nankai University,Tianjin 300350,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2024年第4期140-146,共7页
Membrane Science and Technology
基金
国家自然科学基金项目(52373100,52200102)
天津市自然科学基金项目(21JCZDJC00270)
国家重点研发计划项目(2017YFC0404003)
南开大学中央高校基本科研业务费专项资金(63221312)资助。
关键词
复分解电渗析
树脂填充床
谷氨酸钠
连续工艺
一级两段
electrodialysis metathesis
resin filled
sodium glutamate
continuous process
two hydraulic stages
