玉米秆碳源去除地下水硝酸盐

Performances of bio-denitrfication using maize stalks as carbon source for nitrate-contaminated groundwater in-situ remediation

研究比较了经氢氧化钠、氨水预处理的玉米秆和玉米芯作为生物反硝化碳源时,不同氮负荷条件下的脱氮性能。结果表明,经3%氢氧化钠溶液预处理的玉米秆,在不同氮负荷下均具有较高的硝酸盐去除率,最高达到了97.17%。在原位净化模拟实验中,用该方法预处理的玉米秆作为可渗透反应墙(PRB)的填充介质,硝酸盐和总氮的去除率分别达到了89.68%和84.97%,且出水中没有亚硝酸盐氮和氨氮的积累。结果表明,经3%氢氧化钠溶液预处理的玉米秆,可以作为地下水原位净化修复的固相碳源。

This study compared the denitrification performances at different nitrogen loadings when using maize stalks and maize cobs pretreated by sodium hydroxide and ammonia solution,respectively. The results showed that the nitrate removal efficiency was higher at different nitrogen loadings when using maize stalks pretreated by 3% NaOH solution（ by weight） as carbon sources,and the highest nitrate removal efficiency reached94. 76%. In in-situ simulation experiments,maize stalks pretreated by 3% NaOH solution were considered as the packing medium of permeable reactive barrier（ PRB）. Results showed that the nitrate and TN removal efficiencies were 89. 68% and 84. 97%,respectively,and no accumulation of nitrite and ammonium was observed.These results indicated that it was applicable using maize stalks pretreated by 3% NaOH solution as carbon sources for nitrate-contaminated groundwater in-situ remediation.