石灰软化-超滤技术在柠檬酸沼气双发酵耦联工艺中的应用

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  • 1(江南大学 生物工程学院,工业生物技术教育部重点实验室,江苏 无锡,214122) 2(湖北工业大学 生物工程与食品学院,湖北 武汉,430000)

网络出版日期: 2018-09-13

基金资助

江苏省现代工业发酵协同创新中心资助;高校学科人才引进计划;本项目受国家轻工技术与工程一流学科自主课题资助(LITE2018-27)

Application of lime softening and ultrafiltration in integrated citric acid-methane production process

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  • 1(Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology,Jiangnan University, Wuxi 214122, China)2(School of Biological Engineering and Food, Hubei University of Technology, Wuhan 43000, China)

Online published: 2018-09-13

摘要

为解决柠檬酸行业的发酵废水污染问题,提出了柠檬酸沼气双发酵耦联工艺。前期研究发现,采用电渗析对厌氧消化液进行脱盐时,浓水易发生结垢现象;空气吹脱需要将厌氧消化液升温并维持在55 ℃,从而消耗大量能源。为解决上述问题,引入石灰软化-超滤技术以避免浓水结垢,并代替原先的空气吹脱工序。研究发现, Ca(OH)2最佳投加量为2.5 g/L,超滤最佳操作压强和膜面流速为0.20 MPa和4.023 m/s,此时,浓水朗格利尔饱和指数(Langelier saturation index, LSI)小于0,结垢现象得以消除。电渗析淡水作为配料水回用于柠檬酸发酵时,柠檬酸产量为(134.67±4.72) g/L,基本与去离子水发酵水平持平。

本文引用格式

苏先峰, 徐健, 鲍家伟, 等 . 石灰软化-超滤技术在柠檬酸沼气双发酵耦联工艺中的应用[J]. 食品与发酵工业, 2018 , 44(8) : 41 -48 . DOI: 10.13995/j.cnki.11-1802/ts.017057

Abstract

To solve the problem of fermentation wastewater in citric acid industry, the laboratory had proposed integrated citric acid-methane production process. Previous research indicated that scale formation was observed in anaerobic digestion effluent with electrodialysis treatment, and air stripping consumed energy to heat anaerobic digestion effluent to 55 ℃. In order to solve the above problems, lime softening-ultrafiltration technology was introduced to eliminate scale and replace air stripping. The optimal lime dose was 2.5 g/L. The optimal operating pressure and crossflow velocity respectively was 0.20 MPa and 4.023 m/s. The Langelier saturation index (LSI) of concentrate was less than 0 and the scale was removed. The citric acid production with the dilute of electrodialysis (134.67±4.72 g/L) was comparable to production with freshwater.
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