【摘要】 采用SJ材料作为改性剂对石英砂滤料进行改性,经测定,其表面的物理化学性能优于石英砂。将改性砂应用于煤砂双层滤料高速过滤工艺,并处理某污水厂的二级出水,其出水的平均浊度、COD、UV254、PO43--P分别为1.23NTU、27.4mg/L、0.1335cm-1、0.42mg/L,对各项指标的去除率均高于石英砂滤料,且完全符合GB/T18920—2002标准中的城市杂用水水质要求。研究发现,高速过滤工艺应该以自然条件下的最大滤速为起始滤速;污染物积累和滤层负压导致水中溶解气体的析出会减小有效过水断面面积,这是引起滤速衰减的主要原因。更多还原

【Abstract】 SJ material gained from industrial waste was applied to modify quartz sand filter media.The physical and chemical properties of the modified sand were determined,being better than those of natural quartz sand.Anthracite and the modified sand were used as filter media of high-speed filtration process to treat the secondary effluent from a WWTP.The average turbidity,COD,UV254,PO3-4-P of the filtration effluent are 1.23 NTU,27.4 mg/L,0.133 5 cm-1 and 0.42 mg/L respectively.The removal rates of pollutants by anthracite and the modified sand are higher than those by anthracite and natural quartz sand.The effluent quality meets the requirement of Reuse of Urban Recycling Water-Water Quality Standard for Urban Miscellaneous Water Consumption(GB/T 18920-2002).The initial filtration rate of high-speed filtration process should be the maximum filtration rate under natural conditions,and the causation of filtration rate decay is proved to be the reduction of the effective filtration area caused by the accumulation of pollutants and the separation of dissolved gas by filter vacuum.更多还原