Sewage and Waste Water Treatment
Removal of contaminants, micro-organisms, and any other type of pollutant in huge volumes of wastewater before pumping it in rivers, streams and oceans prevents damage to environment and also greatly helps in preservation of water sources.
With the increase in scarcity of water, we can say that wastewater in an untapped resource. Today’s technological developments allow us to realize this and offer advanced wastewater treatment processes.

Activated Sludge Process

Application

The activated sludge process is a process for treating sewage and industrial waste water using air and bacteria. Waste waters contain organic material and this is measured by the Bio-chemical Oxygen demand (BOD) and Chemical Oxygen Demand (COD) of the waste water. The activated sludge process is used to bring down the level of BOD and COD in the waste water for further use or discharge as the case may be.

Operation.

In this process air is introduced into a mixture of screened sewage or industrial wastewater combined with organisms to develop mixed liquor which reduces the organic content in the waste water. Once the wastewater has received sufficient treatment, the waste water is taken to a clarifier / inclined surface settler. The supernatant is then usually taken for further treatment before it is discharged. Part of the settled matter from the settling unit is taken back to the inlet of the aeration system. This portion of the sludge which is recycled is called Return Activated Sludge (RAS).