不同填料渗滤系统净化生活污水的效果比较

建立了2套不同填料的地下渗滤系统装置净化生活污水,1号装置由纯土壤装填,2号装置由土壤与砂分层装填,比较了2套装置对污染物的去除效果.2套装置运行了6个月,水力负荷为5 cm·d~(-1)时每天进水4次,10 cm·d~(-1)及20cm·d~(-1)运行时每天进水8次.在水力负荷10 cm·d~(-1)下运行,对化学需氧量(COD)、总磷、NH_4~+ -N、总氮的去除率1号装置分别为80.7%,38.9%,48.7%,43.5%,2号装置分别为88.4%,87.2%,98.2%,24.9%;在水力负荷20 cm·d~(-1)下运行,1号装置发生堵塞现象无法运行,而2号装置对COD、总磷、MH_4~+ -N、总氮的去除率分别为87.1%,56.1%,98.0%,28.9%,对COD及NH_4~+ -N仍保持了良好的去除效果,并且保持了良好的水力渗透性能.研究结果表明,渗滤系统内部填料的改善提高了地下渗滤系统的运行水力负荷及其抗堵塞性能.

Effect Comparison of Municipal Wastewater in Different Mediums Infiltration System

Abstract: Two apparatus were established in a pilot laboratory with two different mediums, 1# apparatus was loaded by pure soil, 2# apparatus was loaded by soil and sand in delamination. The removal effect of contamination of two apparatus was compared. During 6 months operation, each apparatus was dosed 4 times daily with municipal wastewater at 5 cm•d-1 and 8 times at 10cm•d-1 and 20 cm•d-1. In 10 cm•d-1, the removal efficiency of Chemical Oxygen Demand(COD), TP, NH4+-N, TN were obtained 80.7%, 38.9%, 48.7%, 43.5% in 1# apparatus, respectively; the same were obtained 88.4%, 87.2%, 98.2%, 24.9% in 2# apparatus, respectively; in 20c cm•d-1, the removal efficiency of COD, TP, NH4+-N, TN were 87.1%, 56.7%, 98.0%, 28.9% in 2# apparatus, respectively; but 1# apparatus was jammed. The results showed that the hydraulic permeability of soil and sand loaded in delamination apparatus was more excellent than 1# apparatus, and the COD, NH4+-N removal efficiency of 2# apparatus is great. The hydraulic permeability and anti-blockage capability of subsurface wastewater infiltration system was increased by improvement of mediums.