Ammonia digestion method for ammonium nitrate condensed wastewater based on cadmium column reduction method

• Main Authors: ZHANG SHOUHUI, LI PENG, CHANG GUANJIA, ZHANG CONG, LIU CUICUI, XU YUSEN, ZHAO BINGHONG, FAN YANWU, LIU XUBO, LI GANGQIANG, SU JUNPING, GAO YANSHENG
• Format: Patent
• Language: Chinese; English
• Published: 03.02.2023
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention relates to the technical field of sewage treatment, in particular to a nitrosation method for ammonium nitrate condensed wastewater based on a cadmium column reduction method. On the basis of a cadmium column reduction mechanism, ammonium nitrate-containing wastewater is introduced into a cadmium column for reaction under an acidic condition, nitrate radicals are converted into nitrite radicals, then a carbonate solution is added into the reacted wastewater, metal cadmium can be precipitated, cadmium pollution can be eliminated, the nitrosation conversion rate of the nitrate radicals is increased through two-stage reaction, and the nitrosation efficiency of the nitrate radicals is improved. The conversion rate of nitrate nitrosation can reach 90% or above, and efficient short-cut denitrification of a chemical method is achieved. The method is reasonable in process and simple to operate, can replace a short-cut denitrification process in the existing environmental protection field, opens up a new