活性炭的介绍(英文)
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New Developments in
Activated Carbons
Jan van den Dikkenberg
Norit Activated Carbon
The topics
•What is Activated Carbon?
•New Developments in Activated Carbons
(AC)
–Catalytic GAC in water treatment
–Anaerobic groundwater treatment
–WFD, municipal wastewater
–WFD, 1-STEP ©filter
–Water reuse
What is Activated Carbon ?
Highly porous carbonaceous adsorbent
High surface area
1 teaspoon of carbon (5 g) has
the same surface area as
a football field (≈1000 m²/g)
Raw Materials Used for Norit Activated Carbons
Lignite
Peat
Coal
Coconut shells
Wood
Olive stones
Particle sizes and shapes
Powdered (PAC)
D50: 10-50 µm
Different
filtration rates Granular
(GAC)
Broken
0.25-5 mm
(4-50 mesh)
Granular
(GAC)
Extruded
Diameter
0.8-4 mm
Micro pores< 1 nm
Meso pores1-25 nm
Macro pores> 25 nm
Adsorption proces
Driving force
•Target compounds: hydrophobic, dissolved organics, typically not or poorly biodegradable
•Examples: (halogenated) aromatics, chlorinated solvents, dissolved oil, PAH, non-biodegradable COD, AOX, colour, DOC
•Concentration level: relatively low (polishing)
The position of AC in water treatment Applications
x
Aquarium water x
Point of Use water x x Pool water x x Waste water x
Ultra-Pure water x
Steam condensate x
Beverage Industry x x Potable water PAC
GAC
New Developments
Click here and type text
•First level
•First level
–Second level
–Second level
Catalytic GAC in water treatment
Click
•First level
•First level
–Courtesy PWN
Catalytic GAC in water treatment Process outline
Heemskerk
Pre-treatment Surface water H
2
O2/UV
Catalytic GAC
Norit ROW 2 CAT
Infiltration
Anaerobic groundwater treatment
–Courtesy Van Der Hoeven Kliniek
Anaerobic groundwater treatment Process outline
Utrecht
Anaerobic extraction
Solvents adsorption
NRS CARBON EA 0.5-1.5
Anaerobic
infiltration
WFD
WFD
The role of AC?
•Natural and synthetic hormones
•Detergents (Alkyl phenols)
•Plasticizers (Phthalates)
•PAH
•Pesticides and herbicides
•Medicine residuals
The Swindon Project
Introduction
•Demonstration project for advanced wastewater treatment •GAC filters in operation since Feb 2008
•Once exhausted the carbon is due for reactivation at our Purton thermal reactivation plant