water treatment reuse ppt
TRANSCRIPT
A CASE STUDY ON SEWAGE TREATMENT AND REUSE - A
STEP TOWARDS WATER CONSERVATION
H.Dinesh Agnihothri (13AG1A0149)
CONTENTS
OBJECTIVES INTRODUCTION SEWAGE CHARACTERISTICS TREATMENT
PRIMARY TREATMENT SECONDARY TREATMENT
CASE STUDY CONCLUSION
OBJECTIVES
TO CONSERVE WATER
TO REUSE THE TREATED WATER IN AN EFFECTIVE WAY
USAGE OF MODERN TECHNIQUES IN ECONOMICAL WAY
INTRODUCTION
CASE STUDY DONE IN NAGPUR
PRACTICAL KNOWLEDGE IN AMBERPET HYDERABAD
DIFFERNCE BETWEEEN THE CASE STUDY AND PRACTICAL IMPLEMENTATION
SEWAGE CHARACTERISTICS PHYSICAL CHARACTERISTICS
Odour Temperature Colour Solid materials
CHEMICAL CHARACTERISTICS DO BOD pH
BIOLOGICAL CHARACTERISTICS
PROPERTIES RANGE
pH
DOTotal suspended
solids
Volatile suspended
solids
COD – total
BOD – total
7.05 to 7.30
0.4
380 to 480
5 to 10
620 to 700
280 to 310
Analysis report at Effluent Channel
Analysis report at Influent channel
PROPERTIES RANGE
pH 8.6 to 8.10
DO 4.2 to 5.50
Total suspendedsolids
11 to 25
Volatile suspended
Solids
5.2 to 8.4
COD- total 50 to 100
BOD- total 9 to 14.5
TREATMENT PRIMARY TREATMENT
INLET CHAMBER (INFLUENT CHANNEL)
SCREENING
COARSE SCREEN FINE SCREEN
DETROITER TANK
INLET CHAMBER(INFLUENT CHANNEL)AVERAGE INFLOW : 3.92 CUM/SEC
PEAK FLOW : 7.84CUM/SEC
SCREENING COARSE SCREEN : 12mm BARS SPACING
o FINE SCREEN: 10MM BARS SPACING
DETROITER TANKREMOVAL OF SAND PARTICLESRETENTION TIME : 2 to 4Hrs
SECONDARY TREATMENT
UASB REACTORS
FACULTATIVE AERATED LAGOON
POLISHING POND
CHLORINATION TANK
OUTLET CHAMBER (EEFLUENT CHANNEL)
UASB REACTORSREMOVAL OF BOD : 50 % to 70%
RETENTION TIME : 8 to 10Hrs
FACULTATIVE AERATED LAGOON
1st Compartment LIQUID DEPTH : 3.8m2nd Compartment LIQUID DEPTH : 1.5m
POLISHING POND
REMOVAL OF REMAINING SUSPENDED PARTICLES. DETENTION TIME : 12Hrs
CHLORINATION TANKCHLORINE ADDED : 1ppm to 2 ppmMAXIMUM CHLORINE ADDED : 6ppm
OUTLET CHAMBER(EFFLUENT CHANNEL) WIDTH OF CHANNEL : 1000mm
CASE STUDY By SHRIRANG VRUSHALI and CHATTERJEE KAUSTAV
80% of sewage in India is untreated and flows directly into the nation’s rivers, polluting the main sources of drinking water.
Indian cities produce nearly 40,000 million litres of sewage everyday and barely 20% of it is treated.
MATERIALS AND METHODS METHODOLOGY
Activated sludge process
Chlorination
Filtration
DUAL MEDIA FILTRATIONPhysical operation by interposing a
medium through which only the fluid can pass.
The fluid passes through is called a filtrate.
Two types of sand filters are in use:Slow filtersRapid filters
Modern water treatment plants now use rapid dual-media filters.
A dual media filtration consists of a layer of anthracite coal above a layer of fine sand.
In mixed media filters, a third layer consisting of fine grained dense mineral i.e. granite, at the bottom of the bed is present.
Dual media filtartion
SCHEMATIC DIAGRAM BASED ON THIS RESEARCH STUDY - PROPOSED TREATMENT SCHEME FOR TREATMENT AND
REUSE OF SEWAGE
RESULTS
Sn. Parameter Value
1. pH 7.2
2. COD 320mg/L
3. BOD 190mg/L
4. TSS 200mg/L
5. Total Coliform 10 MPN/100ml
Inlet characteristics of raw sewage
Treatment Initial Characteristics BOD
(mg/L)
COD(mg/L)
TSS(mg/L)
Total Coliform MPN/100ml
Raw Sewage 190 320 200 107
Activated Sludge Process
18 65 80 107
Chlorination 8 35 80 104
Dual Media Filtration
6 24 10 104
Treatment Reduction percentage from initial values
%BOD
% COD
% TSS
% Coliform
Raw Sewage
After Activated Sludge Process
90.5%
79.6%
60% ---
Chlorination 95.8%
89.0%
60% 99%
Dual Media Filtration
96.8%
92.5%
95% 99%
CONCLUSION
The effective use of dual media filtration helps in further treatment of sewage water.
The treated water can be reused rather than flowing it to the rivers or streams.
Natural resources can be preserved. Environmental balance exists.
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