Abstract
In this study, the influence of growth of reeds on evapotranspiration (ET) was estimated, and a commonly used meteorological estimate of potential evapotranspiration (PET) was compared with direct measurements of ET. The salinity of the inside of HSF of the raw leachate inflow was 15.0±3.4g Cl-/L and that of the double diluted inflow was 9.3±1.9g Cl-/L. Although the growth of reeds in the raw leachate inflow was impeded remarkably compared to that of the double diluted leachate inflow, the reeds in the double diluted inflow bed showed healthy growth. The difference in the salinity gave rise to large differences in the growth of the reed. The annual ET rates in the poor vegetation bed, the dense vegetation bed and the unplanted bed were 656.5mm, 2,334.3mm and 22.2mm, respectively. The difference of the growth of the reed provided a large difference in the ET rate. The annual PET estimated on the basis of the Hamon equation was 751.6mm. The PET rate was much lower compared to the ET rate in the dense vegetation bed. It was necessary to consider site-specific factors such as the growth of plants in the evaluation of the water budget in the HSFs.
Highlights
In Japan, most waste is incinerated in order to reduce the landfill disposal of wastes and the incinerated ashes are dumped into landfills
There were few studies concerning the treatment of high salinity landfill-leachate with constructed wetlands, some reports concerning horizontal subsurface constructed wetlands (HSFs) were given over the past several years [5,6,7,8]
The objective of this study was to estimate the influence of growth of reeds on ET and to compare a commonly used meteorological estimate of potential evapotranspiration (PET) with the ET, which is estimated on the basis of water balance method
Summary
In Japan, most waste is incinerated in order to reduce the landfill disposal of wastes and the incinerated ashes are dumped into landfills. As the ashes contain a large quantity of inorganic salts, most landfill-leachates contain a high salinity which is higher than that of sea water. Various kinds of plants such as reed, reed canary glass, cattail, papyrus, iris, etc., are planted in the constructed wetlands [1], a high salinity remarkably impedes. There were few studies concerning the treatment of high salinity landfill-leachate with constructed wetlands, some reports concerning horizontal subsurface constructed wetlands (HSFs) were given over the past several years [5,6,7,8]. There are several roles of wetland plants on constructed wetlands [9,10,11],: (1) prevention of clogging by rhizome of plants, (2) oxygen release from the rhizome, (3) the offer of a habitat of a rhizosphere, (4) uptake of nutrients, and (5) the offer of a natural landscape
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