Environmental Technology ChimH409 (2-0-1) Michel Verbanck [email protected] 2012 Universite Libre...
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Transcript of Environmental Technology ChimH409 (2-0-1) Michel Verbanck [email protected] 2012 Universite Libre...
Environmental Technology ChimH409 (2-0-1)
Michel Verbanck
2012
Universite Libre de Bruxelles Welcome @ BrufaceDept Water Pollution Control
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
Part 3.
Water & wastewater treatment
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
Archimedes screws for initial wastewater pumping
bar screen separation
Grit and grease removal
counter-current washing and extraction of the grits
Typical steps in municipal wastewater treatment
DECANTATION
Gravity – Archimedes buoyancy
2236 sss vdBdvAgd
Terminal settling velocity vs
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
vs
= vs d
vs
Boycott effect
vs can now be reduced to
LAMELLA SETTLING TANKS:Shortening the settling distance
Pipebundlesalso used
Actiflo process (OTV - Krüger)
coagulation, flocculation, settling assisted by 125µm microsand injection, lamellar gravity separation
residence time lower than 15 min
Module for flow repartition(between dry-weather and wet-weather treatment lines)
Parshall flume for flow-rate measurement (at the outlet of the plant)