废砖基质折流式垂直流人工湿地处理二级生化尾水

Tail Water Purification Efficiency of Baffled Vertical-flow Constructed Wetland Using Broken Bricks as Substrate

秉着“以废治废”的理念,将建筑垃圾废砖块用作人工湿地填料,用折流式垂直流的运行方式研究人工湿地系统在0.15、0.25、0.35mV(m^2-d)这3种水力负荷条件下对二级生化尾水的净化效果和污染物沿程变化规律。结果表明:废砖块可作为系统生物膜附着生长的载体,并适合湿地植物的正常生长,对尾水中污染物的去除有积极作用O折流式垂直流人工湿地在3种不同水力负荷条件下均可以显著削减进水污染物负荷,出水氮、磷的浓度均随着水力负荷的增加而增加。在0.15m^3/(m^2d)的低水力负荷条件下,系统对COD、NH4^+-N、TN和TP的平均去除率可达到66.52%、72.10%、56.53%和91.55%,出水COD和TP浓度低于《地表水环境质量标准》(GB38382002)中的1D类水体标准限值。3种水力负荷条件下,COD、NH4^+-N、TN和TP浓度沿程逐渐降低,下流池对污染物的去除效率明显高于上流池,尤其在进水端表层0-30cm范围内污染物均有一个快速降解的过程。

According to the concept of using “waste” for wastewater treatment, an innovative application that used the broken bricks as the main substrate in baffled vertical-flow constructed wetland was researched. The purification effect and the variation of pollutants along the experiment flow under three hydraulic loading rates [0. 15 m^3/( m^2 ·d), 0. 25 m^3/( m^2·d) and 0. 35 m^3/( m^2·d )] were evaluated. The results showed that the broken bricks from construction waste could be served as the carrier for the biofilm formation and were suitable for the normal growth of wetland plants, which had a positive effect on the removal of pollutants in the tail water. The baffled vertical-flow constmcted wetland significantly reduced the influent pollutants loading in all three hydraulic loading conditions. The concentration of nitrogen and phosphorus in effluent rose with the increase of hydraulic loading rates.