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Untangling Microbiota Diversity and Assembly Patterns in the World's Largest Water Diversion Canal
Zhang, Lu; Yin, Wei; Wang, Chao; Zhang, Aijing; Zhang, Hong; Zhang, Tong; Ju, Feng
2021-12-01
Source PublicationWATER RESEARCH
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环境水质学国家重点实验室
KeywordStevia Coagulation Membrane fouling PAFC FeSO4
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46868
Collection环境水质学国家重点实验室
Affiliation1.Westlake Univ, Sch Engn, Key Lab Coastal Environm & Resources Zhejiang Pro, 18 Shilongshan Rd, Hangzhou 310024, Zhejiang, Peoples R China
2.Westlake Inst Adv Study, Inst Adv Technol, 18 Shilongshan Rd, Hangzhou 310024, Zhejiang, Peoples R China
3.Changjiang Water Resources Protect Inst, 515 Qintai St, Wuhan 430051, Hubei, Peoples R China
4.Construct & Adm Bur South North Water Divers Midd, 1 Yuyuantan South Rd, Beijing 100038, Peoples R China
5.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, 18 Shuangqing Rd, Beijing 100085, Peoples R China
6.[Zhang, Tong
7.Univ Hong Kong, Dept Civil Engn, Environm Microbiome Engn & Biotechnol Lab, Pokfulam Rd, Hong Kong 999077, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Lu,Yin, Wei,Wang, Chao,et al. Untangling Microbiota Diversity and Assembly Patterns in the World's Largest Water Diversion Canal[J]. WATER RESEARCH,2021,421:-.
APA Zhang, Lu.,Yin, Wei.,Wang, Chao.,Zhang, Aijing.,Zhang, Hong.,...&Ju, Feng.(2021).Untangling Microbiota Diversity and Assembly Patterns in the World's Largest Water Diversion Canal.WATER RESEARCH,421,-.
MLA Zhang, Lu,et al."Untangling Microbiota Diversity and Assembly Patterns in the World's Largest Water Diversion Canal".WATER RESEARCH 421(2021):-.
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