Abstract：
This study investigated the interaction between plant biomass and iron scraps and their influence on nitrogen (including nitrate and ammonia) and phosphorus removal in the subsurface flow constructed wetland. The results showed that with the addition of 0.5 g L-1 of plant biomass and 5.0 g L-1 of iron scraps, the nitrate, total nitrogen and total phosphorus removal were simultaneously improved. During 35 days of continuous operation, the plant biomass played main effect on the enhanced denitrification, accounting for about 57%, while iron scraps enhanced the other 43% of nitrogen removal and most phosphorus removal through precipitation inside the wetlands. Iron scraps could benefit the degradation of cellulose into low molecular carbohydrates by 10%, and the biomass could promote the oxidation of iron and increase the total phosphorus removal by 15%. Plant biomass coupled with iron scraps also improved simultaneously the richness, diversity and evenness of microbial community and promoted the abundance of Nitrospira (17.37%) and Thiobacillus (8.46%) in wetlands. In practice, putting iron scraps as matrix and placing plant biomass in the influent region would be a better choice. This research would provide a new method for effective utilization of plant biomass and iron scraps and further treatment of low-polluted wastewater in the wetlands.
摘要：
本研究调查了地下流人工湿地中植物生物量与铁屑之间的相互作用及其对氮（包括硝酸盐和氨）和磷去除的影响。结果表明,添加0.5gL-1的植物生物量和5.0gL-1的铁屑,硝酸盐，同时提高了总氮和总磷的去除效果。连续运行35天,植物生物量对强化反硝化起主要作用,约占57%，而铁屑通过湿地内的沉淀增强了其他43％的氮去除和大部分磷去除。铁屑可以使纤维素降解成10％的低分子碳水化合物，生物质可以促进铁的氧化，使总磷去除率提高15%。植物生物量加上铁屑也同时提高了丰富度，微生物群落的多样性和均匀性，促进了湿地中硝基螺旋体（17.37％）和硫杆菌（8.46％）的丰度。在实践中,以铁屑为基质，在进水区放置植物生物量是更好的选择。该研究为湿地植物生物质和铁屑的有效利用以及低污染废水的进一步处理提供了一种新的方法。
