Removal of oxyanions from synthetic wastewater via carbonation process of calcium hydroxide: applied and fundamental aspects

Journal of Hazardous Materials
G Montes-HernandezE Quirico

Abstract

Removal of oxyanions (selenite, selenate, arsenate, phosphate and nitrate) during calcite formation was experimentally studied using aqueous carbonation of calcium hydroxide under moderate pressure (P(CO2) congruent with 20 bar) and temperature (30 degrees C). The effects of Ca(OH)(2) dose (10 and 20 g), Ca(OH)(2) source (commercial pure material or alkaline paper mill waste) and oxyanion initial concentration (from 0 to 70 mg atom/L) were investigated for this anisobaric gas-liquid-solid system. The Ca(OH)(2) carbonation reaction allowed successfully the removal of selenite (>90%), arsenate (>78%) and phosphate (congruent with 100%) from synthetic solutions. Conversely, nitrate and selenate had not any physicochemical affinity/effect during calcite formation. The rate of CO(2) transfer during calcite formation in presence of oxyanions was equal or slower than for an oxyanion-free system, allowing to define a retarding kinetic factor RF that can vary between 0 (no retarding effect) to 1 (total inhibition). For selenite and phosphate RF was quite high, close to 0.3. A small retarding effect was detected for arsenate (RF approximately 0.05) and no retarding effect was detected for selenate and nitrate (RF approximately 0). In gen...Continue Reading

Citations

Nov 14, 2013·Environmental Science & Technology·Christine V PutnisEncarnacion Ruiz-Agudo
Mar 3, 2010·International Journal of Environmental Research and Public Health·Mihee LimKwang-Suk You
Feb 22, 2012·Journal of Hazardous Materials·Chamteut OhJunboum Park
Jun 6, 2021·The Science of the Total Environment·Ivan Célio Andrade RibeiroLuiz Roberto Guimarães Guilherme
Jun 18, 2021·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Subhajit DuttaSujit K Ghosh
Sep 1, 2021·The Science of the Total Environment·Yuka YokoyamaYoshio Takahashi

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