environmental technology chimh409 (2-0-1) michel verbanck [email protected] 2012 universite libre...
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Environmental Technology ChimH409 (2-0-1)
Michel Verbanck
2012
Universite Libre de Bruxelles Welcome @ BrufaceDept Water Pollution Control
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Course structure
Part 1. Introduction (incl. generic methods) Part 2. Air pollution control engineering Part 3. Water & wastewater treatment
Part 4. Solid and hazardous wastes
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Part 3.
Water & wastewater treatment
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Total Solids ( 400 –1200 mg/L) often a function of parasitic clearwater infiltration into the sewers
Inorganic (ash)50%
Organic (volatile)50%
Dissolved inorg. 35%
Suspended (>1 µm) 45%(15% inorg) (30% org)
Dissolvedorganic20%
Non-settleableinorganic40%
Settleable (“>10µm”)25% (10% inorg ; (15% organic)
Non-settleableorganic
35%
Typical composition of untreated domestic wastewater
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Archimedes screws for initial wastewater pumping
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bar screen separation
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Grit and grease removal
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counter-current washing and extraction of the grits
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Typical steps in municipal wastewater treatment
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DECANTATION
Gravity – Archimedes buoyancy
2236 sss vdBdvAgd
Terminal settling velocity vs
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DECANTATION
Terminal settling velocity vs
2
22
22
36
sss vdBdvA
ρυ
gd
We define dvdg
Ar s PRe3
2
bbAra 2ReP a = 1.096 b = 13.86
Gravity – Archimedes buoyancy
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vs
= vs d
vs
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Boycott effect
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vs can now be reduced to
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LAMELLA SETTLING TANKS:Shortening the settling distance
Pipebundlesalso used
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Actiflo process (OTV - Krüger)
coagulation, flocculation, settling assisted by 125µm microsand injection, lamellar gravity separation
residence time lower than 15 min
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Module for flow repartition(between dry-weather and wet-weather treatment lines)
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Parshall flume for flow-rate measurement (at the outlet of the plant)
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