A new technology for simultaneous calcium-nitrate and fluoride removal in the biofilm reactor
| Autor: | Jia wei Li, Zi zhen Wu, Jun Feng Su, Ting lin Huang, Han Zhang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Denitrification Nitrogen Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Calcium nitrate chemistry.chemical_compound Fluorides Bioreactors Nitrate Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies Nitrates Precipitation (chemistry) Chemistry Biofilm Pollution Biofilms Calcium Gas chromatography Fluoride Nuclear chemistry |
| Zdroj: | Journal of hazardous materials. 399 |
| ISSN: | 1873-3336 |
| Popis: | In this study, a biofilm reactor containing Acinetobacter sp.H12 was established to investigate the simultaneous denitrification, the removal of calcium and fluoride performance. The main precipitation components in the reactor were determined by SEM, XPS and XRD. The effects of HRT (6 h, 9 h and 12 h), pH (6.0, 7.0, 8.0), influent F- concentration (3 mg/L, 5 mg/L, 10 mg/L) on synchronously removal of nitrate and F- and Ca2+ during reactor operation were studied. Optimum operating conditions were achieved with a nitrate removal ratio of 100%, F- removal ratio of 81.91% and Ca2+ removal ratio of 67.66%. Nitrogen was the main gaseous product analyzed by gas chromatography. Extracellular polymers (proteins) were also identified as sites for biological precipitation nucleation by fluorescence spectroscopy. Moreover, microbial distribution and community structure analysis showed that strain H12 was the dominat strain in the biofilm reactor. And combined with the performance prediction of the reactor, strain H12 played a major role in the process of simultaneous denitrification, F- and Ca2+ removal. |
| Databáze: | OpenAIRE |
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