Journal ArticleDOI
Sulphate control by ettringite precipitation in textile industry wastewaters
TLDR
The results showed that ettringite precipitation is an effective and reliable method for sulphate removal.Abstract:
In the present study, ettringite precipitation was theoretically and experimentally evaluated as a means of sulphate removal. The results showed that ettringite precipitation is an effective and reliable method for sulphate removal. Synthetically prepared samples which were simulated to total wastewaters originating from the textile industry (sulphate concentration of 0.06 M) and to dye bath effluent (sulphate concentration of 0.22 M) were subjected to ettringite precipitation using the systems with Na2SO4–AlCl3–Ca(OH)2–NaOH, Na2SO4–AlCl3–Ca(OH)2, and Na2CO3–Na2SO4–AlCl3–Na(OH)2. An equilibrium model involving precipitation more than one solid phase and with ionic strength correction was used to predict the sulphate removal efficiency as well as solution composition. The optimum pH for ettringite precipitation in all systems was found to be around 12.0. By the application of the method, 0.06 M initial sulphate concentration was reduced down to 60 mg/L for synthetically prepared samples and 325 mg/L for re...read more
Citations
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Journal ArticleDOI
Sulfate removal from wastewater using ettringite precipitation: Magnesium ion inhibition and process optimization.
Weixiao Dou,Zhen Zhou,Lu-Man Jiang,Aijian Jiang,Huang Rongwei,Tian Xiaoce,Wei Zhang,Chen Dongqing +7 more
TL;DR: A two-stage process was designed with Mg2+ 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.
Journal ArticleDOI
The removal of sulphate from mine water by precipitation as ettringite and the utilisation of the precipitate as a sorbent for arsenate removal.
TL;DR: The results indicate that the precipitate produced during sulphate removal from mine water by precipitation as ettringite could be further used as a sorbent for arsenate removal.
Journal ArticleDOI
A novel sulfate removal process by ettringite precipitation with aluminum recovery: Kinetics and a pilot-scale study
TL;DR: Economic evaluation shows that the process with Al recovery reduces cost of ettringite precipitation by 35.1%, and is highly feasible and cost-effective for industrial application of high-sulfate content wastewater treatment.
Journal ArticleDOI
Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect
TL;DR: In this article, the feasibility of removal of sulfate ions from the sodium alkali FGD wastewater using the ettringite precipitation method was evaluated, and the optimal experimental conditions for the removal of S42− ions were determined.
Journal ArticleDOI
Investigation of kinetics and absorption isotherm models for hydroponic phytoremediation of waters contaminated with sulfate.
TL;DR: Two common wetland plants, Pampas Grass and Lucky Bamboo, were used in hydroponic cultivation systems for the treatment of simulated high-sulfate wastewaters andKinetic studies showed that compared to pseudo first-order kinetics, pseudo-second order kinetic models slightly better described sulfate uptake rates by both plants.
References
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Journal ArticleDOI
Evaluation of ettringite and hydrocalumite formation for heavy metal immobilization: literature review and experimental study.
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