Waste water treatment through constructed wetlands

1
Waste water treatment through constructed
wetlands

• Introduction
• How do constructed wetlands work?
• Construction and operation
• Pro - Contra
• Examples

2
Lower AustriaAbwasserplan

• Concept for sustainable waste water treatment in
  remote areas
• Elaboration of the economically most feasible
  variants (precondition for promotion of
  investments)

• Application of constructed wetlands for waste
  water treatment very popular

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How do constructed wetlands work?
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What are the components of constructed wetlands?
1. Pre-treatment 2. Intermittent loading 3.
Planted sand filter
Sizes 4 PE 500 PE (5.000 PE?)
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Errection of Constructed wetlands
1

• Installation of the pre-treatment facilities
• Installation of the intermittent loading facility

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Errection of Constructed wetlands
2
Excavation and leveling of the terrain for the
planted sand filter
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Errection of Constructed wetlands
3

• Sealing of the basins with layers
• Integration of the filter-materials (sand,
  gravel)

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Errection of Constructed wetlands
4
Installation of distribution systems for plane
and uniform water loading
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Errection of Constructed wetlands
5
Planting with reed/cuttle.
10
Errection of Constructed wetlands
6
After one year full coverage and maximum
cleaning capacity of the constructed wetland
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Operation is relatively simple(depending on the
size of the plant)
monthly control of the facilities Ammonium
monitoring yearly Reed/cuttle cutting
(spring) Cleaning of pre-treatment Effort
appr. 1 3 h/PE,year
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Examples in Lower Austria
13
WWTPWEB AG / Pfaffenschlag, Low. Austria
Errection 2000
Size 15 PE
Effluent rates (mg/l) NH4/N 0,01 (5) CSB
25 (60) BSB5 4 (10)
14
WWTPNeuwald / Großgerungs, Low. Austria
Errection 2004
Size 20 PE
Effluent rates (mg/l) NH4/N 0,15 (5) CSB
23 (60) BSB5 2 (10)
15
WWTPIgelschwang / Wallsee-Sindelburg, LA
Errection 2005
Size 100 PE
Errection costs appr. 60.000 EUR (net) Filter
area 600 m² Altitude 350 m
16
WWTP St. WolfgangStadtgemeinde Weitra , Low.
Austria
Errection 2006
Size 150 PE
Errection costs appr. 130.000 EUR (net) Filter
area 625 m² Altitude 550 m