Unit Operations/Processes |
Functions |
Treatment Devices |
Screening |
Removal of large floating, suspended and settleable solids |
Bar racks and screens of various description |
Grit Removal |
Removal of inorganic suspended solids |
Grit chamber |
Primary Sedimentation |
Removal of organic/inorganic settleable solids |
Primary sedimentation tank |
Aerobic Biological Suspended Growth Process |
Conversion of colloidal, dissolved and residual suspended organic matter into settleable biofloc and stable inorganics |
Activated sludge process units and its modifications, Waste stabilisation ponds, Aerated lagoons |
Aerobic Biological Attached Growth Process |
same as above |
Trickling filter, Rotating biological contactor |
Anaerobic biological growth processes |
Conversion of organic matter into CH4 & CO2 and relatively stable organic residue |
Anaerobic filter, Fluid bed submerged media anaerobic reactor, Upflow anaerobic sludge blanket reactor, Anaerobic rotating biological contactor |
Anaerobic Stabilization of Organic Sludges |
same as above |
Anaerobic digestor |