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为了提高复合垂直流芦苇人工湿地系统的脱氮效率,并将其运用于高效处理海水养殖外排水,构建了复合垂直流人工湿地对海水养殖外排水脱氮效率的研究实验。养殖外排水选择海水养殖大菱鲆外排水;水生植物选择芦苇,种植密度为64株/m2;湿地系统基质填料选择珊瑚石、蛭石和细砂。在系统未循环的情况下稳定运行一段时间,探究不同基质层与系统氮效率的关系。在系统循环条件下,探究添加硝化细菌和调节间歇进水方式对系统脱氮效果的影响。实验结果表明,添加硝化细菌可以提高系统对DIN的去除率,且可以在短时间内迅速提高系统对NH_4~+-N去除率,添加硝化细菌可以作为提高系统对DIN的去除率和短时间内提高系统对NH_4~+-N去除效率的一种调控手段;选择不同的间歇进水方式表明,间歇进水可以提高系统对NO_3~--N和DIN的去除率,且连续进水、间歇6 h、间歇12 h进水时,系统对NH_4~+-N的去除率较其它调节方式高,综合考虑系统运行的合理性和高效脱氮性,间歇进水12 h较为合理,调节间歇进水时间可以作为调控系统脱氮效率的一种手段。
In order to improve the denitrification efficiency of composite vertical-flow reed constructed wetland system and apply it to treat external drainage of marine culture, the experiment of composite vertical-flow constructed wetland on the efficiency of nitrogen removal from seawater aquaculture was established. Aquaculture outside the aquaculture selection turbot aquaculture outside the drainage; reed aquatic plant selection, planting density of 64 plants / m2; wetland system matrix filler selection coral, vermiculite and fine sand. Stabilize the system for a period of time without cycling, and explore the relationship between different substrate layers and system nitrogen efficiency. Under the condition of system circulation, the effect of adding nitrifying bacteria and adjusting the way of intermittent influent on the denitrification efficiency of the system was explored. The experimental results show that adding nitrifying bacteria can improve the removal rate of DIN to the system, and can rapidly increase the removal rate of NH_4 ~ + -N in a short time. Adding nitrifying bacteria can improve the system’s removal rate of DIN and short time Improve the system of NH_4 ~ + -N removal efficiency of a regulatory means; choose different intermittent water way shows that intermittent water can improve the system of NO_3 ~ - N and DIN removal rate, and continuous water, intermittent 6 h, intermittent 12 h into the water, the system of NH 4 + -N removal rate higher than other adjustments, considering the rationality of the system operation and high efficiency denitrification, intermittent water 12 h is more reasonable to adjust the intermittent water Time can be used as a means of regulating the efficiency of denitrification system.