| 摘要 |
Dirty process water collected from a process unit is held in a raw water holding tank. Air and process chemicals enter the system in this tank. Water from the tank passes at a uniform rate through a flotation cell where solids are frothed by flocculation and aeration and removed. Makeup water saturated with air and at a lower temperature than the process water liberates air in the cell as part of the aeration. Air dissolved in the tank provides further aeration in the cell. Water from the cell is held in a treated water holding tank and uniformly withdrawn from the tank to a filter for the removal of more solids. Filtered water is stored in a filtered water storage vessel for use in the process facility. Heat exchange keeps the filtered water at required temperature. Water discharged from the system to a sanitary sewer may have various degrees of purity. |
