甲酸/甲酸钠还原体系对Fe(Ⅱ)EDTA络合脱硝液再生的影响OACSTPCD

In the complexation denitrification reaction,the reduction and regeneration of Fe(Ⅱ)EDTA complexation denitrification solution is one of the application difficulties,and formic acid/sodium formate system has a good reducing property on Fe(Ⅱ)EDTA complexation denitrification solution under the action of palladium carbon(Pd/AC)catalyst.On this basis,the effects of ultrasonic power,formic acid amount,sodium formate amount and Pd/AC catalyst amount on the reduction and regeneration of Fe(Ⅱ)EDTA complexation denitrification solution(denitrification efficiency is 80%)were investigated by using control variable method.The results show that under the action of Pd/AC catalyst without ultrasonic,the formic acid/sodium formate reduction system can effectively reduce NO in Fe(Ⅱ)EDTA complexation denitrification solution,and achieve the reduction and regeneration of the complexation denitrification solution.When the amount of sodium formate is 10.00 g/L,the amount of formate is 2.10 g/L,and the amount of Pd/AC catalyst is 3.00 g/L,the denitrification performance of the regenerated complexation denitrification solution exhibits the best denitrification performance at 50℃(the denitrification efficiency reaches more than 97%within 60 min and the denitrification efficiency reaches more than 80%within 90 min).After several times of continuous complexation denitrification and reduction regeneration experiments,the whole system still has good denitrification performance(at the 6th switching,the denitrification efficiency is about 85%within continuous absorption for 70 min to 80 min).The results can provide reference for the pilot test and engineering application of continuous complexation denitrification.