METHOD OF TREATING WASTE WATER CONTAINING HIGH LEVEL NITRATE NITROGEN

摘要

A method of chemical treatment for waste water containing nitrate- nitrogen, in which waste water containing nitrate-nitrogen can be treated under atmospheric pressure and in which high level nitrate-nitrogen can be effectively treated. This method is characterized by comprising adding hydrazine or a salt thereof to waste water to be treated, reducing the nitrate-nitrogen to nitrite-nitrogen in the presence of sponge copper catalyst and thereafter bringing the water to be treated containing the nitrite-nitrogen into contact with at least one amide so as to carry out quantitative and chemical reduction to nitrogen through diazotizing reaction.