Results
The changes in water characteristics were observed before and after dissolving Hg(II), As(II) and Cu(II). Hardness, alkalinity, COD and TDS were recorded increased in all the groups. DO was found to decrease throughout the experiment in different groups except group IV. In group I and II, chloride content was recorded constant while it was increased in group III and V, and registered a decline trend in group IV. pH was also found constant in group I and II, while it was decreased in group III and V, but increased in group IV. Temperature almost remained unchanged throughout