1

Primary Treatment

The objective of preliminary treatment is the removal of coarse solids and other large materials often found in raw wastewater Removal of these materials is necessary to enhance the operation and maintenance of subsequent treatment units. Preliminary treatment operations typically include coarse screening, grit removal and, in some cases, communication of large objects.

2

Secondary Treatment

The objective of secondary treatment is the further treatment of the effluent from primary treatment to remove the residual organics and suspended solids. In most cases, secondary treatment follows primary treatment and involves the removal of biodegradable dissolved and colloidal organic matter using aerobic biological treatment processes.

3

Communicate Large Object

The objective of primary treatment is the removal of settleable organic and inorganic solids by sedimentation, and the removal of materials that will not (scum) by skimming. Removal of large object materials is necessary to enhance the operation and maintenance of subsequent treatment units. A communicator removes large objects with great precision.

4

Aerobic Biological Treatment

Aerobic biological treatment is performed in the presence of oxygen by aerobic microorganisms (principally bacteria) that metabolize the organic matter in the waste water, thereby producing more microorganisms and inorganic end-products (principally CO2, NH3, and H2O). Several aerobic biological processes are used for secondary treatment differing primarily in the manner in which oxygen is supplied to the microorganisms and in the rate at which organisms metabolize the organic matter.

5

No Residual Organics

Residuals organic are no longer a problem with modern technological advances. Updated processes that catch all organics can reduce cost, save time, and provide a better end result. Removal of biodegradable dissolved and colloidal organic matter using aerobic biological treatment processes ensures an effective and smooth functioning system.

6

Combination Of Processes

Common high-rate processes include the activated sludge processes, trickling filters or bio filters, oxidation ditches, and rotating biological contractors. A combination of two of these processes in series (e g bio filter followed by activated sludge) is sometimes used to treat municipal wastewater containing a high concentration of organic material from industrial sources