Q. During preliminary treatment of a sewage (Solved)
1. Oil and grease are removed from skimming tanks
2. Floating materials are removed by screening
3. Girt and sand are removed by girt chambers
4. All the above
- d. All the above
1. Oil and grease are removed from skimming tanks
2. Floating materials are removed by screening
3. Girt and sand are removed by girt chambers
4. All the above