Enhanced removal of humic substances in effluent organic matter from a leachate treatment system via biological upgradation of molecular structure
| Autor: | Wang Yuan, Xianbo Sun, Zhengqing Cai, Chen Mengfan, Jin Xibiao, Wang Xinyi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Molecular Structure 0208 environmental biotechnology Chemical oxygen demand Size-exclusion chromatography 02 engineering and technology General Medicine 010501 environmental sciences Membrane bioreactor 01 natural sciences 020801 environmental engineering Bioreactors chemistry Dissolved organic carbon Environmental Chemistry Humic acid Organic matter Leachate Waste Management and Disposal Effluent Humic Substances Water Pollutants Chemical 0105 earth and related environmental sciences Water Science and Technology Nuclear chemistry |
| Zdroj: | Environmental technology. 43(23) |
| ISSN: | 1479-487X |
| Popis: | Biological upgradation (BU) process was proposed, with the goal of converting the molecular structure, for improving the coagulation effect on humic substances (HS) in effluent organic matter (EfOM) from the membrane bioreactor of a leachate treatment system. Enhancement of coagulation effect was observed with improvement of chemical oxygen demand (COD) and HS removal efficiency from 45.5% and 56.5% to 80.0% and 92.6% (Fe dosage was 400 mg·L-1), respectively, which was approximately 30-40% higher than other available researches. Variations in molecular weight and carboxyl contents of fulvic acid (FA) and humic acid (HA) were analyzed by size exclusion chromatography coupled with dissolved organic carbon detection, potentiometric titration, and Fourier transform infrared spectroscopy. The obtained results indicated that BU process led to the growth of molecular weight of HS, of which the larger-molecular-weight (1650 Da) FA and HA raised from 19.07 mgC·L-1 and 0.34 mgC·L-1 to 71.67 mgC·L-1 and 1.58 mgC·L-1, respectively, as well as increases in the carboxyl contents of FA and HA from 6.70 meq·gC-1 and 6.28 meq·gC-1 to 11.84 meq·gC-1 and 8.71 meq·gC-1, respectively. Because of this, a stronger binding effect between Fe and HS might be formed that improved the coagulation effect. |
| Databáze: | OpenAIRE |
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