Abstract
Wastewaters produced in sodium carbonate production industry include a high level of different mineral matters, such as calcium and magnesium salts, that cause difficulties in disposal of effluent into the environment. In this study, a new method based on chemical treatment and CO2 gas injection in order to remove Mg2+ and Ca2+ ions from effluent of a sodium carbonate industry was presented. By employing this method, in addition to removing the calcium hardness of wastewater, CO2 can be used as a responsible gas for global warming. Besides, the influence of some parameters, including the temperature of reaction, gas flow rate, time of gas injection, and the initial pH of wastewater, has been investigated on treatment processing. The results clarified that wastewater’s initial pH was the most important factor affecting Ca2+ removal efficiency. The maximum removal of Ca2+ ions occurred when pH was above 10. At last, the proposed method manifested better performance in mineral salts’ ions elimination with removal efficiency of calcium and magnesium of about 50 and 95% in optimized conditions, respectively.
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