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Substratum phosphorus accumulation during maturation of gravel-bed constructed wetlands



Substratum phosphorus accumulation during maturation of gravel-bed constructed wetlands



Water Science & Technology 40(3): 147-154



Accumulation of phosphorus was investigated in the substrata and surface deposits of pilot-scale gravel-bed constructed wetlands after 2 (planted and unplanted) and 5 (planted only) years operation. Four different hydraulic loading rates of farm dairy wastewaters provided mean cumulative total P (TP) loadings ranging from apprx520 to 2000 g m-2 after 5 years operation. Mean substratum TP accumulations after 2 years operation ranged from 52 to 100 g m-2 in the planted wetlands and from 40 to 51 g m-2 in the unplanted wetlands, both showing a general increase with wastewater loading. After 5 years operation, associated with declining wetland TP removal performance, substratum TP accumulations in all the planted wetlands converged at similar values of 115 to 128 g m-2. This represented 6 to 23% of their cumulative loadings.

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Accession: 011422330

Download citation: RISBibTeXText

DOI: 10.1016/s0273-1223(99)00458-8



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