The pace of industrialization is exponential that the adverse effect caused by it is contributing to the environmental concerns. Though people are aware of the limitations in water resources, water pollution still prevails. Thousands of gallons of sewage water are being released everyday by numerous factories and industries which adds to the pollution of both land and water sources. Sewage treatment plants do the work of removing the contaminants from sewage water before it getting expelled into environment.
Sewage treatment plant design are simple in their built up and working procedures. The various stages in the sewage treatment have the following process involved in it.
The primary stage happens in huge tanks which involves sedimentation of heavy solid waste while liquid impurities like grease, oil floats to the surface. The liquid impurities are then separated from the solid waste by clarifiers and the process is known as clarification.
Secondary Stage/Aeration
Aeration is the part of secondary stage of sewage treatment. It involves the process of sludge activation which is done by pumping air into the tank using large sized fans called aerators. The impure organic contamination in the sewage water has a very high demand for biological oxygen and aeration provides oxygen to bacteria for treating the wastewater. The bacteria help in gathering sludge impurities and it is removed. The aeration tank design and the process of aeration have a direct impact in the efficiency of sewage treatment plant.
The tertiary stage in the sewage treatment plant is the disinfection process. The treated sewage water from the earlier stages is disinfected either chemically or physically to remove the toxic contents and thus making it fit to discharge into the local water bodies.
Sewage treatment plants play significant part in controlling the water pollution. The contaminated water which is drained makes an imbalance in the aquatic ecosystem and when the untreated water is used for irrigational purposes the fertility of the land is completely lost. The major reason behind the life crisis in some of the underdeveloped countries is because of the absence of proper sewage treatment systems making the state of life miserable.
As sewage treatment plants functions round the calendar the maintenance schedule of the treatment plant should be strict. The energy should be efficiently used and knowledge about the various machines involved in the treatment process is vital. The machineries like clarifiers and aerators are the most integral part in the treatment process and hence there should be regular inspection in their working condition. There should be no compromise in the quality and maintenance procedures of the machinery used in process as it may lead to lack of efficient functioning. The clarifiers should not get clogged with the solid impurities and the filaments in aeration tanks must be cleaned regularly from the biological built up which not only increases its energy consumption but also reduces the efficiency rates. The aerators should be cleaned from biological growth as it may lead to improper sludge deposition.
No comments:
Post a Comment