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A new process combination with high water flux and superior treatment performance for stevia sugar liquor
Liu, Hongkai; Graham, Nigel; Liu, Ting; Xue, Xinjie; Yu, Wenzheng
2021-10-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume421Pages:-
AbstractStevia sugar is widely used in food owing to its advantages of low calorie content and high sweetness. In the production of stevia sugar, stevia leaves are immersed in water to obtain a crude liquor, which contains many impurities, such as proteins, polysaccharides, organic acids, etc. These impurities are removed typically by coagulation and filtration. At present, suppliers of stevia mainly use a lime + ferrous sulfate (FeSO4) process as the pretreatment, but residual SO2- can cause hydrogen sulfide corrosion and Ca can affect the safety of subsequent boilers in the process. In this study, polyaluminium ferric chloride (PAFC) was evaluated as a superior coagulant to FeSO, together with ultrafiltration (UF) and nanofiltration to remove flocs and other organic contaminants. It was found that coagulation by PAFC out-performed FeSO and was unaffected by pH, while the performance of FeSO was sensitive to pH. At pH 10, FeSO4 had an enhanced coagulation efficiency, but formed soluble Fe2+ complexes with organic substances in the original solution, which adversely affected the quality of the filtrate. Compared with a UF membrane, the NF membrane was more effective in removing contaminants, and more tolerant to membrane fouling. In addition to hydrodynamic flux, measurement of trans-membrane electrical current were used to reflect the severity of membrane fouling. The combination of PAFC as coagulant without pH adjustment, and ultrafiltration, was found to be a simpler and superior treatment for stevia liquor with a high degree of contaminant separation, and avoidance of problems caused by SO and Ca.
Department中国科学院饮用水科学与技术重点实验室
KeywordStevia Coagulation Membrane fouling PAFC FeSO4
WOS Research AreaEngineering, Environmental ; Engineering, Chemical
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46168
Collection中国科学院饮用水科学与技术重点实验室
Affiliation1.Beijing Inst Technol, Sch Chem & Chem Engn, Beijing 100081, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
3.Imperial Coll London, Dept Civil & Environm Engn, London SW7 2AZ, England
4.Dongtai Haorui Biotechnol Co Ltd, Dongtai, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Liu, Hongkai,Graham, Nigel,Liu, Ting,et al. A new process combination with high water flux and superior treatment performance for stevia sugar liquor[J]. CHEMICAL ENGINEERING JOURNAL,2021,421:-.
APA Liu, Hongkai,Graham, Nigel,Liu, Ting,Xue, Xinjie,&Yu, Wenzheng.(2021).A new process combination with high water flux and superior treatment performance for stevia sugar liquor.CHEMICAL ENGINEERING JOURNAL,421,-.
MLA Liu, Hongkai,et al."A new process combination with high water flux and superior treatment performance for stevia sugar liquor".CHEMICAL ENGINEERING JOURNAL 421(2021):-.
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