垂直流-水平流复合人工湿地处理系统净化效果影响因素的研究

Influencing factors on purification efficiency by means of hybrid constructed wetlands system of vertical-flow and horizontal-flow

就垂直流-水平流复合人工湿地系统对化粪池出水净化效果的影响因素进行了研究.结果表明,水力停留时间(Hydraulic retention time,HRT)分别为2和3 d时,复合系统对COD和BOD5的去除率最大.在HRT为3 d的前提下,复合系统对COD、BOD5、NH3-N的去除率与COD、BOD5、NH3-N负荷之间呈抛物线关系.3个复合系统中,VH1对COD和NH3-N的去除效果明显,达最大去除率时COD负荷为25.40 g/(m2.d)、NH3-N负荷为14.82g/(m2.d),当BOD5负荷分别达13.75 g/(m2.d)时,其对BOD5的去除率也达到最大;复合系统对COD、BOD5的去除率与气温之间呈抛物线关系,VH1对COD的去除效果明显,当气温为23.5℃时对COD的去除率最大,而当气温为21.1℃时,对BOD5的去除率最高;复合系统对NH3-N的去除率与气温之间呈正相关关系.

Influencing factors on purification efficiency of outflow to septic tank by means of hybrid constructed wetlands system of vertical-flow and horizontal-flow were studied. The result showed that the removal efficiencies of COD, BOD5 were the highest when the Hydraulic retention time （HRT） was 2-day,3-day respectively. The removal efficiencies of COD, BOD5 and NH3-N in the hybrid system had quadratie correlation with pollutant loading when the HRT was 3-day. VH1 removed the COD and NH3-N more significantly. The removal effieieneies of COD and NH3-N were the highest when the COD loading and NH3-N loading were 25.40 g/（ m^2 · d） and 14. 82 g/（ m^2 · d） respectively, the removal efficiency of BOD5 was the highest when the BOD5 loading was 13.75 g/（m^2·d） . The removal efficiencies of COD and BOD5 in the hybrid system had quadratic correlation with air temperature when the HRT was 3-day. VH1 removed the COD and NH3-N significantly in the three hybrid systems. The removal efficiency of COD was the highest when the air temperature was 23.5 ℃ and the removal efficiency of BOD5 was the highest when the air temperature was 21.1℃. The removal efficiency of NH3-N had positive correlation with the air temperature.