Case Study: Pagubice
The community of Cerovlje is situated in the rural and continental part of the largest Adriatic peninsula Istria (Croatia). The settlement Pagubice has about 80 inhabitants and a small number of cattle.
This settlement has a recent water supply, all houses have sanitary devices and a partial sewer system is already present. The wastewater is discharged in ground and surface water, which causes local pollution and discomfort. Together with rain, raw wastewater ends in a nearby lake, lake Butoniga, that acts as a reservoir for drinking water which affects a broader area.
In consultation with local authorities a conceptual design was made, a constructed wetland to treat sewage with an equivalent of 35 p.e..
This settlement has a recent water supply, all houses have sanitary devices and a partial sewer system is already present. The wastewater is discharged in ground and surface water, which causes local pollution and discomfort. Together with rain, raw wastewater ends in a nearby lake, lake Butoniga, that acts as a reservoir for drinking water which affects a broader area.
In consultation with local authorities a conceptual design was made, a constructed wetland to treat sewage with an equivalent of 35 p.e..
Main Characteristics
Hybrid System: Vertical Subsurface Flow CW and Horizontal Subsurface Flow CW |
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Design basis
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35 p.e.
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Type of Wastewater
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Sewage, domestic wastewater
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Hydraulic Loading
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5.25 m³/day
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Pretreatment: Septic Tank |
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Effective volume
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21 m³
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Residence Time
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4 days
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Layout
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2 compartments + pumping chamber
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Vertical Subsurface Flow Constructed Wetland (VSSF) |
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Surface Area
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70 m²
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Length x Width
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7 m x 10 m
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Depth
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1.20 m
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Filtration Materials
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Gravel 4/14 (Inlet gravel 8/32, outlet gravel 8/32)
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Vegetation
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Phragmites australis
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Horizontal Subsurface Flow Constructed Wetland (HSSF) |
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Surface Area
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80 m²
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Length x Width
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10.6 m x 7.5 m (surface)
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Depth
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0.75 m (mean value, slope 0.94%)
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Filtration Materials
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Gravel 4/14 (Inlet gravel 8/32, outlet gravel 8/32)
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Vegetation
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Phragmites australis or Carex sp.
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Rietvelden