Anna-Kaisa Ronkanen , Bjørn Kløve

Turpeen hydrauliset ominaisuudet kunnallisten jätevesien ja turvetuotantoalueen valumavesien puhdistukseen rakennetuissa kosteikkopuhdistamoissa

Ronkanen A.-K., Kløve B. Turpeen hydrauliset ominaisuudet kunnallisten jätevesien ja turvetuotantoalueen valumavesien puhdistukseen rakennetuissa kosteikkopuhdistamoissa.

Tiivistelmä

Peat hydraulic conductivity (K), specific yield (S), degree of humification and shear strength were measured at two wetland treatment systems constructed on natural peatlands receiving different wastewater quality and loading in Northern Finland. Peat K was measured with a falling head piezometer test in situ and by taking soil cores in horizontal and vertical directions using Eijkelkamp cylinders. Peat S was obtained from pF-curves and drainage tests. The K in situ was 5.2x10-7 - 2.9x10-3m s-1, the horizontal K was 6.1x10-6 - 3.8x10-2 m s-1 and the vertical K was 4.2x10-6 - 2.6x10-2m s-1. The highest K value was usually found in the vertical direction. The estimated acrotelm layer with high K reached 40 - 60 cm at Kompsasuo wetland and 10 - 60cm at Ruka wetland. There was an agreement between different measurement methods for S when pF values corresponding to relevant negative pressure were used. S varied from 0.023 to 0.23. After several years of wastewater loading, the peat hydraulic conductivity was still sufficient to maintain wastewater flow in the top 50 cm of the peatland.

Vastaanotettu 31.10.2017 Julkaistu 1.1.2005

Katselukerrat 1441

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