Short Essay On Sewage
SEWAGE
Sewage is waste water, in solution or suspension, which contains some chemical and toxic substances, suspended solids and harmful bacteria. It consists mostly of greywater (from sinks, tubs, showers etc), blackwater (the water used to flush toilets, combined with the human waste that it flushes away) and soaps and detergents. Sewage must be treated for the removal of toxic and hazardous chemicals and microorganisms before releasing it into the sea [1].
TREATMENT OF SEWAGE
There are four major phases sewage passes through before being disposed off into the river. The general method of sewage treatment includes: Pretreatment, primary treatment, secondary treatment and tertiary or final treatment [1].
i) PRETREATMENT
Pretreatment of sewage
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Sewage is passed through a chamber in which both grit and Greece are removed simultaneously. It uses the action of rolling water to agitate and separate the grit and grease. The washed grit drops out into the trough at the bottom of the grit channel. Varying the rolling intensity allows different weights of grit to be removed. Periodically a travelling bridge removes the deposited grit for extraction purposes. The grit is suctioned and transported out of the grit channel and released into the grit trough. The grease removal channel which is adjacent to grit removal channel is composed of a long narrow water filled channel contrary to the turbulent rolling water of the grit channel; the grease channel is purposefully free of any sort of turbulence and allows the grease to float to the surface. One steeply slope side of this concrete channel provides a way for any grit particles to slide back into the trough of the grit channel. The side by side grit and grease channels are separated by a divider baffle curtain wall. The thick plastic pickets of baffle wall absorb the energy of grit channel rolling water to produce the quite pool needed for the grease removal on the other side. Fluid typically air and or water is lightly blown on to the water surface to direct the flowing grease towards the exit end
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