EGSB工艺处理高氮废水的影响因素研究

Influence Factors of EGSB Process for Treatment of High-nitrogen Wastewater

研究了F^-,Ca^(2+)和氨氮对膨胀颗粒污泥床(EGSB)反应器脱氮效果的影响,结果表明:(1)低质量浓度F^-(20mg/L)对EGSB反应器脱氮效果产生冲击,但经6～8 d后处理能力可恢复至正常水平;(2)适当质量浓度Ca^(2+)(500 mg/L)的加入将促进生化脱氮过程,过高质量浓度Ca^(2+)(1 000 mg/L)的存在将使污泥颗粒中无机钙盐含量增加,破坏反应体系pH值平衡,进而抑制脱氮过程;(3)氨氮对反硝化过程无明显抑制作用,但其加入将使出水TN浓度大幅增加。此外,反应器中约有33%的氨氮被去除,推测为厌氧氨氧化作用所致,相关途径有待进一步验证。

In this paper,the influence of fluoride ion,calcium ion and ammonia nitrogen on nitrogen removal in EGSB reactor were studied.The results showed that i)The denitrification capability in EGSB reactor was shocked by low concentration of fluoride ion,but the negative effect could be eliminated after 6~8 days;ii)The addition of proper calcium ion(500 mg/L)would promote the process of biochemical denitrification,while the presence of excess calcium ion(1 000 mg/L)would increase the content of inorganic calcium salt in sludge particles,destroy the pH equilibrium in the reaction system,and finally restrain the denitrification process;iii)Ignorable influence was exhibited on denitrification process by the addition of ammonia nitrogen,but the concentration of total nitrogen in effluent water increased greatly.Besides,there's a great possibility that about 33%of ammonia nitrogen in the reactor was removed by anaerobic ammonia oxidation process,but the relevant approaches need to be verified further more.