Imhoffs Tank, Anaerobic, Double Storeyed Settling Tanks, Fresh Sewage, Scum,Biogas,Imhoff Tank

Imhoff's Tank

Imhoff's Tank
This is an improved design of a septic tank that maintains anaerobic condition more strictly, produces some utilisable biogas and facilitates the settling of solids, but requires expert maintenance. The tank is divided into two sections thus they are double storeyed settling tanks. The upper section acts as the settling tank.

Fresh sewage is introduced in the upper compartment which slips by an opening in the lower compartment. The settling compartment is separated from the digestion compartment. Solids move down into the digestion compartment but are prevented from being carried back up into the settling compartment. Stabilised solids (digested) are removed from the bottom of the tank periodically. Usually, Imhoff tanks are 9 m deep and their construction is costly. The scrap, grease, oil, etc. flood at the top and form a scum. Imhoff tank is quite efficient in allowing complete digestion in 2-4 hours.

imhoffs-tank
Imhoff's Tank

Large Scale Sewage Treatment (Sewage Treatment in Sewered Areas
Primary/Physical/Preliminary Treatment
Removal of grit (Grit/Detritus Chamber)
Removal of fatty oils (skimming tanks)
Sedimentation (Primary sedimentation)
Secondary Treatment
Trickling Filter System
Rotating Biological Contractor or Biodisc System
Oxidation Lagoons
Activated Sludge Process
Modification of Activated Sludge Process(ASP)
Biological Processes for Removal of Nitrogen by ASP
Removal of Excess Phosphates
Submerged Aerobic Filters
Sedimentation (Secondary Sedimentation)
Sludge Digestion
Anaerobic digestors (sludge digestion)
Factors important for anaerobic digestion
Tertiary Treatment
Applications of Waste Treatment Saccharification
Saccharification Processes
Simple Dilute-acid Hydrolysis of Wood
Details of the process
Percolation Processes
Strong Acid Processes for Wood Saccharification
General Problems of Saccharification Processes
Gasification
Process of Gasification
Biomethanation (Anaerobic gasification)
Pelletisation Technology
Plasma arc (pyro-plasma process)
Garret flash pyrolysis process
Vast global potential
Composting
Bangalore Method (Hot Fermentation Process)
Mechanical Composting (Indore Process)

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Imhoff's Tank