Sulfate removal from wastewater using ettringite precipitation: Magnesium ion inhibition and process optimization.
One of the main challenges in industrial wastewater treatment and recovery is the removal of sulfate, which usually coexists with Ca 2+ and Mg 2+ . The effect of Mg 2+ on sulfate removal by ettringite precipitation was investigated, and the process was optimized in the absence and presence of Mg 2+...
| Publicado en: | Journal of Environmental Management Vol. 196; pp. 518 - 527 |
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| Autores principales: | , , , , , , , |
| Formato: | Artículo |
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Academic Press Inc.
Jul2017
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=122775468&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 122775468 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 03014797 EMJ jtl: Journal of Environmental Management issn: 03014797 maglogo: N pubinfo: dt: Jul2017 vid: 196 pid: 735 pub: Academic Press Inc. artinfo: ui: 122775468 10.1016/j.jenvman.2017.03.054 ppf: 518 ppct: 9 formats: tig: atl: Sulfate removal from wastewater using ettringite precipitation: Magnesium ion inhibition and process optimization. aug: au: Dou, Weixiao Zhou, Zhen Jiang, Lu-Man Jiang, Aijian Huang, Rongwei Tian, Xiaoce Zhang, Wei Chen, Dongqing affil: College of Environmental and Chemical Engineering, Shanghai University of Electric Power, 2588 Changyang Road, Shanghai 200090, China Jiangsu Hairong Thermal & Environmental Engineering Co., Ltd, 10 Sanmiao Village, Xingren Town, Tongzhou District, Nantong, Jiangsu 226371, China su: Wastewater treatment Ettringite Sulfates Hydrotalcite Precipitation (Chemistry) Response surfaces (Statistics) sug: subj: Sewage Treatment Facilities Wastewater treatment Ettringite Sulfates Hydrotalcite Precipitation (Chemistry) Response surfaces (Statistics) keyword: Flue gas desulfurization wastewater Inhibitory effect Magnesium Sulfate removal Flue gas desulfurization wastewater Inhibitory effect Magnesium Sulfate removal ab: One of the main challenges in industrial wastewater treatment and recovery is the removal of sulfate, which usually coexists with Ca 2+ and Mg 2+ . The effect of Mg 2+ on sulfate removal by ettringite precipitation was investigated, and the process was optimized in the absence and presence of Mg 2+ . In the absence of Mg 2+ , the optimum conditions with sulfate removal of 99.7% were obtained at calcium-to-sulfate ratio of 3.20, aluminum-to-sulfate ratio of 1.25 and pH of 11.3 using response surface methodology. In the presence of Mg 2+ , sulfate removal efficiency decreased with increasing Mg 2+ concentration, and the inhibitory effect of Mg 2+ matched the competitive inhibition Monod model with half maximum inhibition concentration of 57.4 mmol/L. X-ray diffraction and Fourier transform infrared spectroscopy analyses of precipitates revealed that ettringite was converted to hydrotalcite-type (HT) compound in the presence of Mg 2+ . The morphology of precipitates was transformed from prismatic crystals to stacked layered crystals, which confirmed that Mg 2+ competes with Ca 2+ for Al 3+ to form HT compound. A two-stage process was designed with Mg 2+ removal before ettringite precipitation to eliminate the inhibitory effect, and is potential to realize sludge recovery at the same time of effective removal of sulfate and hardness. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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