Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium Expanded clay and lava rock as potential filter media for nutrient removal in vertical subsurface flow constructed wetlands Rob Van Deun, Mia Van Dyck Katholieke Hogeschool Kempen, Geel, Belgium SWS European Chapter Meeting 29th June – 3rd July 2008 Kuressaare, Saaremaa, Estonia
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Expanded clay and lava rock as potential filter media for nutrient
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Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium
Expanded clay and lava rock as potential filter media for nutrient
removal in vertical subsurface flowconstructed wetlands
Rob Van Deun, Mia Van DyckKatholieke Hogeschool Kempen, Geel, Belgium
SWS European Chapter Meeting29th June – 3rd July 2008
Kuressaare, Saaremaa, Estonia
Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium
Introduction
Lightweight Expanded Clay Aggregates:Literature possible P-removalArgex ??? (“Flemish” LECA)
Argex 0/4• Aggregate size: 0 – 4 mm
Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium
Introduction
Lava rock:Commercial products: CW’s treatment of wastewater, water from fish ponds, swimming ponds
• Two types: size: 2 – 12 mm and 8 – 16 mm
Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium
IntroductionOptimizing nutrient removal with constructed
wetlands
Methods and MaterialsColumn studies: Infiltration columns
Height 80cm
Hydraulic loading50 l / m².d
45 ppm N (NH4NO3) + 15 ppm P (KH2PO4)
Sampling
Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium
Methods and MaterialsAdsorption testsDetermining maximum adsorption capacityMethod (described by Seo, 2005):• 10 g of filter media• Blanks + different P- or N-solutions (100ml)• Continuously shaken for 24 h • After settling, supernatant was filtered
Langmuir equation apparent adsorption capacity
Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium
PhosphorusExperiment 1: 15 mgP/l - 50 l/m².d
Results after 6 months:
Removal: 89.7% 37.7% 45.1%
Experiment 1: Phosphorus
0
0,5
1
1,5
2
2,5
3
argex 0-4 lava 8/16 lava 2/12
g P in
out
Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium
Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium
Conclusions• Argex P-adsorption
• In a constructed wetland?
• Quality ?
• Lava rock: Nitrification in a multi-stage system
Rob Van Deun - Mia Van Dyck KHKempen, Geel, Belgium
Thank you!!!
AKNOWLEDGMENTS• Supported by the Flemish Ministry for Economy, Enterprise, Science, Innovation and Foreign Trade;• Argex nv, Kruibeke, Belgium;• Dockx en Co nv, Mechelen, Belgium• KVLT, Geel, Belgium