| 摘要 |
PURPOSE:To improve transmitting rate of membrane and to obtain a sludge of high concn. and excellent dehydrating property in the process of treating waste water containing heavy metals by adding alkali to produce insoluble matter, separating the insoluble mater with precision filtering membrane to separate a concentrated liquid from processed water. CONSTITUTION:A part of concentrated liquid separated from the raw water is mixed with alkali and the obtd. mixture is added to the raw water containing heavy metal. The alkali sludge obtd. by the reaction of alkali with sludge in the concentrated liquid reacts with heavy metal ion to produce a sludge having excellent dehydrating property. Thereby, the transmitting rate of the membrane is improved and the obtd. sludge has higher concn. and dehydrating property. |
