| 摘要 |
Process for purifying waste water from a vehicle wash installation in which, after a coarse separation, the waste water is treated batchwise in a relatively small process tank (16) by adding a lime suspension as precipitation chemical such that a pH of approx. 11, as well as a lime excess, are obtained in the water. A flocculation chemical is then added to the water in the process tank so that a pH of from approx. 7.5 to 8 is established. In a subsequent, substantially larger sedimentation tank (46) , relatively large floccules are formed, together with the lime excess, such that precipitated contaminants are collected and separated out and sediment on the bottom of the tank (46) . Sludge from the purification process is treated with polyelectrolyte and filtered in sack filters (62). |
