碳源对生物沸石削减富营养化景观水体氮的影响

Effects of Carbon Sources on Nitrogen Reduction by Biological Zeolite in Eutrophic Landscape Water

以某河水为研究对象,采用实验室静态模拟实验,研究沸石与生物沸石(即附着高效异养硝化菌与好氧反硝化菌的沸石)在上覆水体有机碳源发生变化的情况下削减富营养化景观水体氮的效果。结果表明,实验进行19 d时,沸石与生物沸石覆盖对上覆水体氮的削减率分别达到80%~90%,主要以沸石化学吸附及离子交换作用为主,碳源对氮的消减效果影响不明显;19 d后,在有新鲜上覆水补充体系中,生物沸石覆盖对氮的削减率能平稳维持,在无上覆水补充体系中,生物沸石脱氮效率呈下降趋势,削减率最终降至50%~60%。可见,连续补充新鲜上覆水带入有机碳源能提高富营养化水体氮的消减效率,使用生物沸石消减富营养化景观水体氮时,需考虑水体有机碳源浓度。

The effects of zeolite and biological zeolite(zeolite with high efficiency heterotrophic nitrifying bacteria and aerobic denitrifying bacteria)on nitrogen reduction in eutrophication landscape water under the condition of changing organic carbon source in the ancient canal water are studied in laboratory static simulation experiment.The results show that when the experiment lasts for 19 days,the nitrogen reduction rate of the overlying water is 80%~90%by zeolite and biological zeolite,mainly by zeolite chemical adsorption and ion exchange,and the carbon source has no obvious effect on the nitrogen reduction effect.After 19 days,the removal rate of nitrogen by biological zeolite is stable in the system with fresh overlying water,while the removal efficiency of nitrogen by biological zeolite decreases to 50%~60%in the system without overlying water.It can be seen that continuous replenishment of fresh overlying water into organic carbon source can improve the nitrogen reduction efficiency of eutrophic water.Organic carbon source concentration should be considered when using biological zeolite to reduce nitrogen in eutrophic landscape water.