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Monday, 8 January 2018

SEWAGE TREATMENT PLANT

A place where sewage is treated so that it is not harmful or dangerous to the environment is known as STP.
SEWAGE TREATMENT
Sewage treatment is the process of removing contaminants from wastewater, primarily from household sewage. It includes physical, chemical, and biological processes to remove these contaminants and produce environmentally safe treated wastewater (or treated effluent). A by-product of sewage treatment is usually a semi-solid waste or slurry, called sewage sludge, which has to undergo further treatment before being suitable for disposal or other uses.
On Site Observation:
·         The capacity of waste water tank on site is 350 cum.
·         For the residential project, a separate sewage treatment plan has been made to treat the waste water from the four towers and clubhouse. The water comes to the treatment plant under gravity. PVC pipes are used for bringing the waste water to the STP.  
·         When the waste water comes to the sewage tank, the screens which are applied onto the entrance, remove the soil waste out of the water. Then the water moves to the chamber where there are media (made up of plastic fibers) in which the bacteria are allowed to grow.
·         In these chambers, a pipe supplies fresh air to the media so that the bacteria continue to grow in it. The bacteria are made to grow into the media to decompose the solid waste which remains into the water after the screening. The air supplied to the chamber is measured by using a meter.
·         Then the water passes to the next chamber. In this chamber also, there is media which does the similar work as that of the previous one. Here, attached to the air pipes are the ropes, which are suspended deep inside the media layer. Attached to these ropes are the angles which rotate in circular motion and maintain the air circulation in the whole chamber.
·         Then the water passes to the third chamber where there are thin sheets made up of plastic fiber placed in a slant manner. The fibers are placed in a slant manner so that when the water moves upward, the solid particles (if any) may settle down.
·         The water then moves up to the londer beam. Till it reaches the londer beam, all the particulates & other matter settles down making the water fit to move forward for the further treatment.
·         Then the water is treated with a few chemicals and then it becomes fit for making other use of it. The water is purified at the rate of cubic metre per hour.

·          Here in the project, this treated water is used for flushing the sanitary waste from WC’s. Therefore the water is recycled. Also this water is used for the tyre wash and car wash purpose for the visitor cars.

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