氮负荷对烟气脱硫脱硝废水反硝化过程的影响

依据烟气脱硫脱硝废水的主要特征配制模拟废水，研究不同硝态氮负荷对该废水反硝化过程中C和N的变化规律及脱氮效果的影响．间歇式批次实验结果表明：氮负荷为50～400 mg/L时，经过12 h后硝态氮去除率达到95％以上，反应过程中有10％～20％硝态氮转化为亚硝态氮．随着氮负荷的增加，T OC的消耗量也在增加，但降解率逐渐减小，去除每毫克硝态氮所需TOC依次为5．40、4．03、3．15、2．96、2．88、2．32和1．9 mg ． TN的去除包括硝态氮、亚硝态氮和部分有机氮的去除，亚硝态氮完全去除时TN也基本去除．反应结束时，不同氮负荷下所需的△TOC/△TN为1．9～4．0．氮负荷从50 mg/L增加至400 mg/L ，容积反硝化速率由2．73 mg NO－3‐N /（L· h）增加至21．90 mg NO3－‐N /（L · h）．△TOC/△TN与容积反硝化速率、氮负荷之间都呈良好的线性关系．

Effects of Nitrogen Load on Flue Gas Desulfurization and Denitrification of Wastewater Denitrification Treatment

Wastewater is simulated according to the main characteristics of flue gas desulfurization and denitrification of wastewater ,and the effects of different nitrate nitrogen loads on the change rules of C and N as well as the nitrogen removal effects in the process of wastewater denitrification .The results show that the nitrate removal rate is more than 95% after 12 h under the nitrate nitrogen load of 50~400 mg/L ,and there is 10% ~ 20% nitrate transformed into nitrite in the reaction .The consumption of TOC is increasing with the increase of nitrogen load ,however ,the degradation rate is decreasing ,it needs 5 .40 ,4 .03 ,3 .15 , 2.96 ,2 .88 ,2 .32 and 1 .9 mg TOC to degrade per mg nitrate nitrogen .TN removal includes the removals of nitrate ,nitrate and some organic nitrogen .TN removal and nitrate nitrogen removal happen almost simultaneously .At the end of the reaction ,the demand of △TOC/△TN is 1 .9~4 .0 under different nitrogen loads .The volume of denitrification rate increases from 2 .73 to 21.90 mg NO3-‐N/（L ·h） when the nitrogen load increases from 50 to 400 mg/L .△TOC/△TN ,volume denitrification rate and nitrogen load have good linear relationship .