Effect of Sulfate and Chloride Ion in Groundwater on TCE Degradation by ZVI-PRB

Column experiments were done to determine effects of sulfate and chloride ion on TCE degradation by ZVI-PRB.Results showed that sulfate and chloride ion had a dual effect on TCE degradation in the system of ZVI-PRB.As sulfate concentration increased,the efficiency of TCE degradation got better.Sulfate could inhibit the reaction when its concentration was low,however,when its concentration increased,sulfate had a promoting action to the reaction.As chloride ion concentration increased,the efficiency of TCE degradation became worse.When there was a low concentration,chloride ion had a promoting action to the reaction,and when its concentration increased,chloride ion could inhibit the reaction.The study showed that the experiment column can adsorb chloride ion.