外加植物碳源强化人工湿地脱氮的研究进展

RESEARCH PROGRESS IN THE ENHANCEMENT OF NITROGEN REMOVAL USING PLANT BIOMASS AS EXTRA CARBON SOURCE IN CONSTRUCTED WETLANDS

对于低碳高氮受污染水体的处理,可以通过添加碳源增强人工湿地系统的脱氮效果。植物碎屑来源广泛、经济低廉,逐渐成为人工湿地反硝化外加碳源材料,同时还可以作为微生物生长的载体改善系统去污能力。目前,植物材料作为外加碳源已有不少研究:植物碳源的种类选择,主要集中在物质的释放和表面结构两方面;针对不同植物采用不同预处理方式;寻求在人工湿地系统中合适的添加量及最佳添加位置。对以上几个方面的研究现状进行了综述,并总结和分析了植物碳源在人工湿地水体净化的实际应用中存在的问题和将来的研究方向。

For the treatment ofpolluted water with low C/N ratio, nitrogen removal efficiency ofconstructed wetlands can be effectively enhanced by adding extra carbon sources. Among carbon source materials, plant litter with widely available sources and low cost has gradually become an alternative foreign carbon source for denitrification in constructed wetlands. Moreover, it can be used as a biofilm carrier for microbial growth and helping to improve the nitrogen removal ability. At present, there have been quite a few researches on plant materials used as extra carbon source. The current studies were reviewed in many aspects： variety choice of plant carbon source, which was studied from the perspectives such as the released substances and surface structure; various pretreatment methods for different types of plants; the appropriate dosage and the best adding position in constructed wetland system. Finally, problems existing in the practical application of plant carbon source in water purification of constructed wetlands were summarized and the research directions in the future were also analyzed.