Preparation of Composite Modified Quartz Sand Filter Material and Purification Effect of Polluted Source Water by Modified Bio-sand Filter
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-calci-um double hydroxide modified sand(CAS)were produced by modifying QS with amino,aluminium ion and aluminium-calcium 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 com-pared 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.
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