Abstract
Natural pectin, derived from fruit residue, presented a certain flocculation performance in previous studies. However, the process of extraction and treatment affected the flocculation performance considering the uncontrollable chemical composition and the molecule structure. In this study, degree of esterification (DE), degree of amidation (DA) were used as the internal factors affecting flocculation performance. The DE/DA values of pectin were obtained through FTIR, elemental analyses, H-NMR, and titration measurements. The kaolin suspension was employed for the coagulation jar tests, and the removal of NTU (Nephelometric Turbidity Unit) was used as the index of the flocculation performance. Results showed that the flocculation performance of pectin arising from different fruits was different, which was associated with the various preparation processes. By introducing polar groups into pectin, the flocculation was found to be related to bridging, adsorption, and charge neutralization. Based on the trends of three-dimensional response surfaces, the flocculation effect was improved with the decreased DE and the increased DA. The optimized amidated pectin was obtained by the amidation experiment, the turbidity reduction in wastewater was 99.63%. PRACTITIONER POINTS: The internal influencing factors of pectin as a flocculant were investigated. Different sources of pectin show different flocculation ability. Amidation modification can improve the flocculation performance of pectin. Response surface method to study the interaction of different influencing factors. Pectin may replace synthetic flocculants in water treatment.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
