pH对砂柱反硝化脱氮的影响

Effect of pH on Denitrification in Sand Column

在不同的初始pH条件下,72 h后砂柱中不同深度溶液的pH值,都出现了上升的现象;但是在不同初始pH条件下,砂柱中同一深度溶液pH值变化幅度不同。在不同的初始pH条件下,砂柱中硝酸盐的去除效率各不相同;当初始pH=7.00时,在砂柱的400 mm、800 mm深度处的取样样品中分别测得硝酸盐浓度为44.89 mg/L、14.98 mg/L,砂柱对硝态氮的脱除效果最好;当初始pH=5.00时,在砂柱的400 mm、1200 mm深度处的取样样品中分别测得硝酸盐浓度为132.56 mg/L、56.68 mg/L,砂柱对硝态氮的脱除效果最差。

At different initial pH conditions, after 72 h, the pH value at different sand column depths all appeared rising phenomenon, with different magnitudes. At different initial pH, the sand column nitrate removal efficiency varied. When the initial pH value was 7.00 after 72 h, nitrate concentration of sand column 400 mm, 800 mm depth was 44. 89 mg/L and 14. 98 rag/L, sand column for nitrate removal works best. When the initial pH value was 5.00, after 72 h, nitrate concentration of sand column 400 mm, 1200 mm depth was 132.56 mg/L and 56. 68 mg/L, the effect of sand column for nitrate removal was the worst.