出水回流对连续式折流潜流人工湿地脱氮除磷效果的影响

发布时间：2019-06-18 21:37

【摘要】：以模拟生活污水为研究对象,构建两组基质分别为砾石、木块、炉渣和砾石、炉渣、木块配置方式的水平折流潜流人工湿地(HBSFs),探讨不同回流比(0%、50%和150%)对两组人工湿地系统(HB1和HB2)脱氮除磷的影响。研究结果表明,当水力停留时间为2 d时,出水回流对水中氨氮和总氮的去除率提高效果显著,当回流比为150%时,氨氮平均去除率可达约60%,高于不回流时的氨氮去除率(45%),总氮的平均去除率(64%)也高于不回流时总氮的去除率(53%);同时,出水回流在一定程度抑制硝态氮的去除,对总磷的去除效果略有提高,但不明显;硝氮去除率从不回流时的95.4%~96.6%降至回流时的72.7%~87.2%。可见,与不回流相比,回流条件下对水中氨氮、总氮和总磷的去除效果都有所提高。
[Abstract]:Taking simulated domestic sewage as the research object, two groups of horizontal baffle subsurface flow constructed wetland (HBSFs), with gravel, wood block, slag and gravel, slag and wood block were constructed to investigate the effects of different reflux ratios (0%, 50% and 150%) on nitrogen and phosphorus removal in two groups of constructed wetland systems (HB1 and HB2). The results show that when the HRT is 2 days, the removal rate of ammonia nitrogen and total nitrogen in water is significantly increased by effluent reflux. When the reflux ratio is 150%, the average removal rate of ammonia nitrogen can reach about 60%, which is higher than that without reflux (45%), and the average removal rate of total nitrogen (64%) is also higher than that without reflux (53%). At the same time, the effluent reflux inhibited the removal of nitrate nitrogen to a certain extent, and the removal effect of total phosphorus was slightly improved, but not obvious, and the removal rate of nitrate and nitrogen decreased from 95.4% 鈮，

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