Investigation of the removal and recovery of nitrate by an amine-enriched composite under different fixed-bed column conditions
| Autor: | Minh Đỗ, Enrico T. Nadres, Debora F. Rodrigues, Ali Ansari |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
021110 strategic
defence & security studies Environmental Engineering General Chemical Engineering 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences 01 natural sciences Chloride Volumetric flow rate Chitosan chemistry.chemical_compound Adsorption chemistry Nitrate medicine Environmental Chemistry Amine gas treating Glutaraldehyde Sulfate Safety Risk Reliability and Quality 0105 earth and related environmental sciences Nuclear chemistry medicine.drug |
| Zdroj: | Process Safety and Environmental Protection. 150:365-372 |
| ISSN: | 0957-5820 |
| DOI: | 10.1016/j.psep.2021.04.027 |
| Popis: | Continuous adsorption of nitrate in a fixed-bed column can be an effective method for its removal from water. In this study, an amine-rich polymer composite adsorbent was prepared by crosslinking chitosan (CS) and polyethyleneimine (PEI) with glutaraldehyde (GLA). The CS-PEI-GLA was packed into columns and the effect of flow rate, influent concentration, bed height, and other ionic species on the column performance was investigated. The highest adsorption capacity was achieved at the lowest flow rate and highest influent concentration and bed height. Maximum adsorption capacity of 137.62 mg NO3−-N/g was determined from the Thomas model. The column had acceptable nitrate removal in the presence of 1000 ppm chloride but poor performance in the presence of 1000 ppm sulfate due to the competitive effect of sulfate for binding sites. The best recovery agent was 0.5 M NaCl as it could regenerate the column to |
| Databáze: | OpenAIRE |
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