Abstract
Precipitation dechlorination has the advantage of being a simple process with a low cost. However, there are few reports on the effect of cations on dechlorination. In this study, we investigated the effect of cations in high-salt wastewater on the removal of chlorine ions by cuprous chloride precipitation and analysed the corresponding mechanism. A series of investigations revealed that Fe3+ could oxidise sulphite, thereby reducing the removal rate of chlorine ions. The reaction between magnesium and sulphite results in precipitation, which has a slightly adverse effect on the removal of chloride ions. Hexavalent chromium oxidises the chloride ion, resulting in the formation of chlorine gas, which improves the removal rate. Ferrous and manganese, however, do not have a notable effect on chlorine removal.
Highlights
Saline wastewater is the primary wastewater discharged by industries such as mining, petrochemical, food processing, metallurgy, leather, chemical pharmacy, papermaking, textile, paint, pigment and machinery manufacturing (Shi et al )
According to the abovementioned experimental methods, the added ferric sulphate mass was changed to study the influence of the iron (III) concentration in the water on the chloride ion removal efficiency
This shows that the chloride ion removal efficiency decreases with the increase in iron concentration
Summary
Saline wastewater is the primary wastewater discharged by industries such as mining, petrochemical, food processing, metallurgy, leather (tanning), chemical pharmacy, papermaking, textile, paint, pigment and machinery manufacturing (Shi et al ). Zhang et al ( c) studied the use of extraction to remove chlorine from chlorine-containing wastewater The benefits of this method are its simple operation and the ability to recycle chlorine. Lv et al ( ) and Li et al ( ) adopted the method of chlorine ion anion exchange recycling and fixed salt solution of chlorine These mature technologies can be used effectively and repeatedly. This method is affected by the water anion exchanger and cannot be operated for large water volumes or for high concentrations of chloride wastewater. The precipitation method is simple to operate, effective at removing chlorine and a relatively low-cost operation. In this research, we investigated the best precipitation methods for chlorine removal
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