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Full Design of Componets OF Sewage Tretment Plant (200 KLD)

This document describes the design of various components for a 200 KLD sewage treatment plant, including: 1. The receiving chamber is designed to be 527mm x 263mm x 3000mm to receive 8.33 cubic meters of sewage per hour with a 60 second retention time. 2. Screening is the first operation and removes debris using coarse screens with 50mm openings placed at a 30-60 degree angle to the horizontal. 3. The screen design calculations determine a required clear opening area of 0.00869 square meters, accommodated by screens with 30mm openings and channel width of 1.0 meter.

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886 views4 pages

Full Design of Componets OF Sewage Tretment Plant (200 KLD)

This document describes the design of various components for a 200 KLD sewage treatment plant, including: 1. The receiving chamber is designed to be 527mm x 263mm x 3000mm to receive 8.33 cubic meters of sewage per hour with a 60 second retention time. 2. Screening is the first operation and removes debris using coarse screens with 50mm openings placed at a 30-60 degree angle to the horizontal. 3. The screen design calculations determine a required clear opening area of 0.00869 square meters, accommodated by screens with 30mm openings and channel width of 1.0 meter.

Uploaded by

rahul
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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FULL DESIGN OF COMPONETS

OF
SEWAGE TRETMENT PLANT (200 KLD)
RECEIVING CHAMBER

ABOUT: -

1. It is the structure to receive the raw sewage collected through Under


Ground Sewage System from the city.

2. It is a rectangular shape tank constructed at the entrance of the Sewage


Treatment Plant (STP).

3. The main sewer pipe is directly connected with this tank.

DESIGN: -

 Average. Sewage per hour = 200/24 = 8.33 m3/Hr


 Peak Factor = 3
 Design Flow capacity = 8.33*3 =25.00 m3 /Hr. = 0.00695 m3/sec
 Design flow = 0.00695 m3/sec
 Retention Time = 60 Seconds
 Volume Required = Design Flow*Detention Time
= 0.00695*60 = 0.4167 m3
 Provide, Depth = 3.0 m
 Area = 0.4167/3 = 0.1389 m2
 Let, Length:Breadth = 2:1
 Area = Length*Breadth (L*B) = 2B*B = 2B2 = 0.1389

B = 0.2635 m and L = 0.5270 m

Hence, Receiving chamber is designed for size of 527mm*263mm*3000


mm+FB
SCREENING
GENERAL: -

Screening is the very first operation carried out at a Sewage Treatment


Plant and consists of passing the raw sewage through different types of
screens so as to trap and remove the floating matter such as tree leaves,
paper, gravel, timber, pieces, rags, fibre, tampons, cans, and kitchen refuse,
etc.

PURPOSE OF SCREENING: -

Screening is essential in sewage treatment for removal of materials which


would otherwise damage the plant, interfere with the satisfactory
operation of treatment unit or equipment.

COARSE SCREENS: -

a. The coarse screens essentially consist of steel bars/flat placed 30o to


60o inclination to the horizontal.
b. The opening between bars are 50mm or above.
c. These racks are placed in the screen chamber provided in the way of
sewer line.

2. It is a rectangular shape tank constructed at the entrance of the Sewage


Treatment Plant (STP).

3. The main sewer pipe is directly connected with this tank.

DESIGN: -

 Peak discharge of Sewage = 0.00695 m3/sec.


 Assume velocity at average flow is not allowed to exceed 0.8 m/s.
 The net area screen opening required = 0.00695/0.8
= 0.00869 m2
 Clear opening between bars = 30 mm or 0.03 m.
 Size of bars = 75 mm*10 mm.
 Assume width of the channel = 1.0 m.
 The screens are placed at 60o to the horizontal.
 Velocity through screen at peak flow = 1.6 m/s.
 Clear Area = 0.00869/(1.6*sin60) = 0.00628 m2.
 No. of clear opening = 0.00628/0.03 = 0.21 Nos.
 Width of Channel =

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