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A novel approach for rapidly measuring volatile fatty acids in anaerobic process
Zan, Feixiang1,2; Zeng, Qian1; Chi, Kun1; Hao, Tianwei2; Ekama, George A.3
2020-09-01
Source PublicationWater Research
ISSN0043-1354
Volume182Pages:115960
Abstract

Volatile fatty acids (VFAs), the intermediate of the anaerobic process, are considered to be the critical, high-sensitive and reliable indicators of the process stability. Close monitoring and control of VFAs are paramount for the efficient operation of the anaerobic reactors. In this study, a buffer intensity-based mathematical model was developed, and the least square method was integrated into the model to solve the issue of non-linear fitting of the titration curve. An automatic analyzer embedded with the developed model was designed and implemented for measuring VFAs and alkalinity. Through model optimization, the pH range of 3.5–5.6 was found to be suitable for VFAs analysis. The developed approach was validated by different VFAs (up to 500 mg/L as acetic acid) and carbonate alkalinity concentrations (up to 1500 mg/L as CaCO) with high recovery rates (>0.9). Optimal ratios of carbonate alkalinity to VFAs are identified in the range of 2.4–7.5 for accuracy. Owing to the non-linear fitting of the titration curve, the impact of other weak acid subsystems (e.g., phosphate, ammonium and sulfide) can be negligible. The one-year real-time monitoring of environmental samples by using the automatic analyzer indicates a high consistency and stability compared with the 5 pH point titration. This approach proves to be rapid (<3 min/sample), accurate, reliable and can be applied for real-time automatic monitoring of the anaerobic process.

KeywordAlkalinity Anaerobic Processes Buffer Intensity Five Ph Point Titration Volatile Fatty Acids
DOI10.1016/j.watres.2020.115960
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering ; Environmental Sciences & Ecology ; Water Resources
WOS SubjectEngineering, Environmental ; Environmental Sciences ; Water Resources
WOS IDWOS:000569156100006
PublisherPERGAMON-ELSEVIER SCIENCE LTDTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Scopus ID2-s2.0-85087120763
Fulltext Access
FWCI0.43475264
Citation statistics
Document TypeJournal article
CollectionDEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorHao, Tianwei
Affiliation1.Department of Civil and Environmental Engineering, Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution (Hong Kong Branch) and Water Technology Center, The Hong Kong University of Science and Technology
2.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, China
3.Water Research Group, Department of Civil Engineering, University of Cape Town, Cape Town, South Africa
First Author AffilicationFaculty of Science and Technology
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Zan, Feixiang,Zeng, Qian,Chi, Kun,et al. A novel approach for rapidly measuring volatile fatty acids in anaerobic process[J]. Water Research,2020,182:115960.
APA Zan, Feixiang,Zeng, Qian,Chi, Kun,Hao, Tianwei,&Ekama, George A..(2020).A novel approach for rapidly measuring volatile fatty acids in anaerobic process.Water Research,182,115960.
MLA Zan, Feixiang,et al."A novel approach for rapidly measuring volatile fatty acids in anaerobic process".Water Research 182(2020):115960.
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