priyank project
TRANSCRIPT
-
8/17/2019 Priyank Project
1/13
WELCOME
Presentation on sewage treatment
Submitted by – Priyank G
Diplom civil –
-
8/17/2019 Priyank Project
2/13
CONTENTS
• Introduction
• What is Sewage treatment plant
• Why treat sewage
• Stages of sewage treatment
• aying of sewer pipes
-
8/17/2019 Priyank Project
3/13
SEWAGE
Sewage is a water!carried waste" in solution or suspension" tis intended to be removed from a community# $lso known asdomestic or municipal wastewater" it is more than %%& water
and is characteri'ed by volume or rate of (ow" physicalcondition" chemical and to)ic constituents" and its bacteriolog
status *which organisms it contains and in what +uantities,#
-
8/17/2019 Priyank Project
4/13
SEWAGE TREATMENT PLAN
Structures and appurtenances which receivethe discharge of a sanitary drainage system
and which are designed to bring about a
reduction in the organic and bacterial contentof the waste so as to render it less o-ensiveor dangerous" e#g#" a septic tank or cesspool#
-
8/17/2019 Priyank Project
5/13
WHY TREAT SEWAGE
$cross the world" there continues to be huge volumes ofwastewater pumped directly into rivers" streams and theocean itself# .he impact of this is severe – aside from thedamage to the marine environment and to /sheries it can
cause" it does little to preserve water#• Improving the environment through proper drainage
and disposal of wastewater
• Preventing (ood through removal of rainwater
-
8/17/2019 Priyank Project
6/13
STAGES OF SEWAGE
TREATMENT
• Stage 0! Screening
• Stage 1! Primary .reatment
•
Stage 3! Secondary .reatment• Stage 2! inal .reatment
-
8/17/2019 Priyank Project
7/13
-
8/17/2019 Priyank Project
8/13
SCREENING
Screening is /rst stage of the wastewatertreatment process# Screening removes largeob4ects like" diapers" nappies" sanitaryitems" cotton buds" face wipes and evenbroken bottles" bottle tops" plastics and rags
that may block or damage e+uipment#Special e+uipment is also used to removegrit that gets washed into the sewer#
-
8/17/2019 Priyank Project
9/13
PRIMARY TREATMENT
.his involve the separation of organic solid matter *orhuman waste, from the wastewater# .his is done byputting the wastewater into large settlement tanksfor the solids to sink to the bottom of the tank# .hesettled solids are called 5sludge6# $t the bottom of
these circular tanks" large scrappers continuouslyscrape the (oor of the tank and push the sludgetowards the center where it is pumped away forfurther treatment# .he rest of the water is then
moved to the Secondary treatment#
-
8/17/2019 Priyank Project
10/13
SECONDARY TREATMENT
.he water" at this stage is put into largerectangular tanks# .hese are calledaeration lanes# $ir is pumped into the waterto encourage bacteria to breakdown thetiny bits of sludge that escaped the sludgescrapping process#
-
8/17/2019 Priyank Project
11/13
FINAL TREATMENT
7e)t the 5almost6 treated wastewater is passedthrough a settlement tank# 8ere" more sludge isformed at the bottom of the tank from thesettling of the bacterial action# $gain" the sludgeis scrapped and collected for treatment# .he
water at this stage is almost free from harmlesssubstances and chemicals# .he water is allowedto (ow over a wall where it is /ltered through abed of sand to remove any additional particles#
.he /ltered water is then released into the river
-
8/17/2019 Priyank Project
12/13
LAYING OF SEWER PIPES
1. Determine Elevation
2. Slope
3. Trench and Bedding
4. Lay the Pipe
5. inal !"n
-
8/17/2019 Priyank Project
13/13
THANK YOU