适用于地表水反硝化的淀粉碳源选择

Selection of starchy carbon sources suitable for the biological denitrification of surface water

以江南大学校内湖水为接种物,采用不同淀粉质有机物作为反硝化细菌碳源进行摇瓶反硝化降解试验。有机质释放试验结果显示,在蒸馏水组有机质释放量木薯>小麦>玉米≈马铃薯,湖水组NO3--N的存在可刺激合成碳源材料有机质的释放。马铃薯和小麦释碳性质相似,均呈波动性;硝酸盐降解实验表明马铃薯和小麦均具有较高的脱氮效果,脱氮率在90%以上,前7 d脱氮过程符合零级反硝化动力学方程,两种碳源的脱氮周期为7 d。综合而言,选择马铃薯合成材料用于地表水反硝化的淀粉碳源。

Some lake water in Jiangnan University campus has been used as substances have been used as denitrification bacteria carbon resources for inoculum,and various starchy organic carrying out the shake-flask test of denitrification degradation. The results of organic matter release show that the releasing quantity at distilled water group is cassava 〉 wheat 〉 corn ≈ potato. The existence of NO3--N at lake water group could stimulate the release of organic matter of synthetic carbon resource materials. The carbon release characteristic of potatoes and wheat is similar and both are fluctuant. The degradation of nitrate indicates that both of potato and wheat have high denitrification effect,whose denitrification rate is above 90%. In the process of the first 7 days, the denitrification corresponds to the zero-order denitrifying dynamic equation. The cycle of the two kinds of carbon resources is 7 d. Generally speaking potato synthesized material should be chosen as a starchy carbon resource suitable for surface water denitrification