碳氮比对废水好氧脱氮中含氮气态产物的影响

针对目前人们对好氧脱氮中气态产物认识不清的问题,采用SBR反应器,以人工配制的NO3--N废水为处理对象,对影响好氧脱氮的COD/N进行了深入研究,测定了三种主要含氮气态产物(NO、NO2、N2O),揭示了好氧状态下生物脱氮的途径和机理。通过对COD/N分别为9、12、15、18的系统氮元素的全程跟踪测定,得到系统内各含氮化合物的变化规律。结果表明,三种气体的产生同COD/N有着密切的关系,低C/N会导致NO、NO2和N2O的积累,最多达总脱氮量的9%。研究结果还表明当进水COD/N为15时,既保证了良好的脱氮效果且抑制了NO、NO2、N2O三种有害气体的大量产生。

The Effect of COD/N Ratio on the Nitric Gaseous Products in Aerobic Denitrification Wastewater Treatment System

Gaseous products in wastewater aerobic denitrification process have not been well studied so far.In this paper,the effects of COD/N ratio on the nitric gaseous products were studied in aerobic denitrification Sequencing Batch Reactor(SBR) activated sludge system in laboratory.The changes of different nitric compounds in water and nitric gaseous products including NO、NO2 and N2O in the system were trailed when the values of COD /N ratio were 9,12,15 and 18 respectively.The results showed that the production of these nitric gases in aerobic denitrification had a tight relation with COD/N ratio,indicating low ratio of COD/N should result in the accumulation of NO,NO2 and N2O,the amount of which was as high as 9 percent of the removed nitrogen at most.Meantime,the results also showed that there were high denitrification rate and low amounts of nitric gaseous products in aerobic denitrification process when the value of COD/N ratio was 15.