Study on effect of ions on photocatalytic degradation of methyl orange solution with phosphotungstic acid
几种阴阳离子对磷钨酸光催化降解甲基橙的影响

A great deal of saline wastewater is discharged during the regeneration process which used to renew the capability of ion exchange resin. Simulative experimental researches were carried out for the reuse treatment of this wastewater. Considering the different characters of the five regeneration phases, the wastewater can be separated into two parts: high concentration saline wastewater and lower concentration part. Two-step precipitation were applied to treat the high concentration saline wastewater, while the lower concentration part can be reused as clean water after small amount of flocculation medicament treatment or be directly recycled after small part is discharged. The experimental result shows that most amount of Ca2+ and Mg2+ in the high concentration wastewater can be removed, the clarifying saline water can be reused after adding salt and hydrochloric acid , and two kinds of sediments can also be recycled.