【摘要】 通过对新砂、前期过滤中由水中铁、锰等黑化材料结垢形成的黑化砂以及黑化砂分别经酸、碱清洗而成的再生砂作为滤料的过滤效果研究表明 :黑化砂、酸洗砂、碱洗砂在滤后水质及过滤水头损失方面与新砂相差不大 ,可以作为滤料在生产中应用 ,并可节省运行成本。但在使用黑化滤料时 ,可适当降低反冲洗强度以避免跑砂延长初滤水时间以保证出水水质。更多还原

【Abstract】 The filtrating performances of four filtrating media, namely the fresh natural sand, blacken sand with Fe and Mn coat dyed at the pre filtration of raw water, acid washed sand and alkali washed sand are compared. The results show that no evident difference was observed in output water quality and head loss of the filtration bed, and the performances of the treated three seem same as the fresh. So all of them could be reused to cut down the operating expenses. However, the authors suggest that using blacken media is preferable to reduce the backwashing intensity to prevent sand losses and to extend the preliminary filtration time for best output water quality.更多还原