复合改性砂滤料制备及生物砂滤池对受污染原水的净化效果

Preparation of Composite Modified Quartz Sand Filter Material and Purification Effect of Polluted Source Water by Modified Bio-sand Filter

为改善普通石英砂(QS)表面特性,提高生物砂滤池生物附着量及对水中污染物的去除效果,对QS进行氨基、铝离子及铝钙双氢氧化物改性,制得氨基改性砂(AMS)、铝离子改性砂(ALS)和铝钙双氢氧化物改性砂(CAS),以四种滤料填充滤池考察对受污染原水的净化效果。结果表明,与QS相比,ALS与CAS表面覆盖了金属离子,AMS、ALS、CAS表面形态及比表面积均得到改善,成膜后表面生物附着量分别增加3.6、5.5、6.9 mg/g;滤速为5 m/h时,CAS滤池对浊度和COD平均去除率分别为90.1%、51.8%。与AMS、ALS滤池相比,CAS滤池表面生物量最大,对水中污染物去除效果良好。

In order to improve the surface characteristics of ordinary quartz sand(QS)and enhance the biomass and the pollutants removal from water,amino-modified sand(AMS),aluminium-modified sand(ALS)and aluminium-calcium double hydroxide modified sand(CAS)were produced by modifying QS with amino,aluminium ion and aluminiumcalcium double hydroxide.The bio-filters were filled with the four types of quartz sands to investigate the effect on the treatment of raw water.The results show that the surface characteristics of AMS,ALS and CAS were improved compared to those of QS,the ALS and CAS surface were covered with the metal ions.The biomass of AMS,ALS and CAS were increased by 3.6 mg/g,5.5 mg/g and 6.9 mg/g,respectively.At hydraulic load of 5 m/h,the average removal rates of turbidity and COD by CAS filter were 90.1%and 51.8%,respectively.Compared with other quartz sands,CAS filter had the highest biomass and better pollutants removal effect.