Effect of Different Modification Methods on Biofilm Characteristics and Treatment Effect of Contaminated Raw Water in Biological Sand Filters
Amino-modified sand(AMS)and aluminium-calcium double hydroxide modified sand(CAS)were pro-duced by modifying ordinary quartz sand(QS)with amino and aluminium-calcium double hydroxide,and QS,AMS and CAS were used as filter media to fill the filter cell for membrane suspension respectively.The results show that the high-est bioactivity of 42.00 mgO2/(g·h),the highest biofilm amount and extracellular polymer content of 12.43 mg/g and 105.09 mg/(g·SS),respectively,were obtained on the CAS surface after successful membrane suspension,and the re-moval rates of CODCr and NH4+-N were stable at 58.20％ and 89.50％,respectively.The bioactivity,biofilm volume and average EPS content of the AMS surface were 32.97 mgO2/(g·h),9.07 mg/g and 93.41 mg/(g·SS),respectively,and the removal rates of CODCr and NH4-N were 54.60％ and 85.10％,respectively.The surface biomass distribution of all three quartz sand species decreased along the direction of water flow,and the content of EPS showed an increasing trend from dissolved extracellular polymer(SL-EPS)to tightly adherent extracellular polymer(TB-EPS).
Composite modified sandbiological sand filterbiofilm formationbiofilm characteristicsmicro-pollu-ted raw water
NETL
NSTL
万方数据
维普
