Friday, 12 October 2012

Sewage Treatment Plants Help In Preserving The Environment

By Robby West


Sewage treatment plants act as the disposal site and treatment of wastewater for the sewage gathered from households, establishments, industrial and agricultural. The collection and disposal of sewage systems conveys the wastewater through cities to the sewage treatment plants. The wastewater is treated to the sewage treatment plants to preserve the environment by controlling water pollution and making sure that the water is thoroughly clean and free from any kind of contaminants before it is released to the environment specifically to the bodies of water. Another objective of treating the sewage is to provide protection to the public health and to prevent the spread of diseases.

The sewage system may transport the wastewater by gravitational forces to get diverted to the sewage treatment plant. If it is not possible for pipeline excavation due to boulders of rock and there's limited topographic relief, the gathering of waste by means of gravity may not be suitable. In this instance, the sewage must be pumped through the pipeline and straight into the sewage treatment plants. For those located in low lying residential areas, wastewater may be transported by means of vacuum. The measurements of pipelines could vary from 6 inches in diameter to thirty feet in diameter of concrete lined tunnels.

The sewage form local community can be gathered by an effluent sewer system also called STEP system or Septic Tank Effluent Pumping. In each house where it utilized a buried collection tank that separates the solids from the liquids portion. The liquid portion is pumped using a small diameter pipe having a size of 1.5 inches to 4 inches heading to the downstream treatment. The pipes may be laid below the ground surface along the land's shape because the waste stream is pressurized. The sewage can also be gathered through the use of low pressure pumps as well as vacuum systems.

The population served is considered in the size and design of the sewage collection systems. Another thing to consider is the industrial and commercial flows, the characteristics of peak flow and the wet weather flow. The combined sewer systems are normally designed to convey both the storm water runoff and sewage simultaneously in the same pipes. The characteristics of the watershed also are considered in the proposed design of the combined sewer systems. Frequently, particularly in the past several years, the mount of typhoon runoff can no longer be handled by the combined sewer which causes sewer overflows. This leads to water pollution problems in the nearby bodies of water.

The design and style of sewer lines which goes to the sewage treatment plant these days are separate lines for storm runoff and sewage alone. The storm runoff will move right to the surface water while the sewage systems will be moved to the sewage treatment plants. Most municipal sewer systems nowadays are created from separate sewer systems. Even if the design of sewer systems would be to have separate lines of which one is entirely intended for sewage, the inflow and also infiltration of surface water can't be avoided. This ultimately might cause the sanitary sewer to flood. The inflow and also infiltration is extremely affected by moisture conditions, which is also provided a significant consideration in the design of system.




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