CAJ | 학술논문

将慢滤池用于污水二级出水的深度处理,并利用小试装置研究了滤层厚度对慢滤池性能的影响.选取浊度、COD和色度三个指标,在滤层不同深度处多次取样,分析各指标沿滤层厚度的变化.结果表明,采用粒径为0.4～0.6 mm,滤层厚度为800 mm的石英砂做滤床时,慢滤池对二级出水具有较好的净化效果:当进水浊度、COD和色度分别为1.3～6.9 NTU、30.4～70.0 mg·L~(-1)和20.6°～57.6°时,平均去除率分别达到86.5%、45.0%和46.3%.从试验结果可以看出,慢滤池类似一个微缩的污水二级处理系统,滤层表面的粘性滤膜起到类似初沉池的作用,可以对各指标实现较好的去除,58.6%的浊度、52.7%的COD和45.7%的色度是在滤层上部去除的;慢滤池中部起到类似曝气池的作用,下部起到类似二沉池的作用,对水质指标也能实现一定的去除.
장만려지용우오수이급출수적심도처리,병이용소시장치연구료려층후도대만려지성능적영향.선취탁도、COD화색도삼개지표,재려층불동심도처다차취양,분석각지표연려층후도적변화.결과표명,채용립경위0.4～0.6 mm,려층후도위800 mm적석영사주려상시,만려지대이급출수구유교호적정화효과:당진수탁도、COD화색도분별위1.3～6.9 NTU、30.4～70.0 mg·L~(-1)화20.6°～57.6°시,평균거제솔분별체도86.5%、45.0%화46.3%.종시험결과가이간출,만려지유사일개미축적오수이급처리계통,려층표면적점성려막기도유사초침지적작용,가이대각지표실현교호적거제,58.6%적탁도、52.7%적COD화45.7%적색도시재려층상부거제적;만려지중부기도유사폭기지적작용,하부기도유사이침지적작용,대수질지표야능실현일정적거제.
A lab-scale slow sand filter was used for advanced treatment of secondary effluent of domestic wastewater. Performances of the slow sand filter along the filter bed were deliberately studied. Results showed that the average removal rates of turbidity, COD and color were 80.0%, 46.3% and 35.1% during a period with the influent turbidity, COD and color were 1.3～6.9 NTU, 30.4～70.0 mg·L~(-1) and 20.6～57.6 degree respectively. The test shows that slow sand filter is like a miniature wastewater secondary treatment systems. The schmutzdecke layer of the upper filter bed is similar with the Primary sedimentation tank, and contributes 58.6%, 52.7% and 45.7% of the total removal amount of turbidity, COD and color; the central and lower regions of filter can respectively play the role of Aeration tank and secondary settling tank, they also achieve a certain purifying effect. All data showed that 800mm depth of sands with grain sizes of 0.4～0.6 mm are suitable for a slow sand filter used for secondary effluent of wastewater polishing.