Study on Impact of Ammonia Nitrogen on Chlorine Consumption in Disinfection Process

Water is disinfected by adding chlorine at the entrance of clear well in a waterworks.When chlorine dosage is increased,the residual chlorine in water at the exit of clear well changes randomly,and sometimes the residual chlorine is even reduced.The existence of the unstable chlorine consumption is validated by static state chlorine-adding experiment.It is found that the reaction character between the raw water and chlorine is quite similar to that between ammonia and chlorine.Comparing the break point chlorination and static state chlorine-adding experiment of raw water,the ammonia nitrogen and the unstable residual chlorine in the pipe network water are considered as the reason of unstable chlorine consumption.