首页|Post-treatment of an aerated facultative pond with constructed wetland:First two years of operation in a dairy industry
Post-treatment of an aerated facultative pond with constructed wetland:First two years of operation in a dairy industry
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In the present study,a horizontal subsurface flow constructed wetland(HSF-CW)with a surface area of 240 m~2 and HRT of 2 days,was used in the post treatment of a facultative aerated pond.Application rates of 175 kg BOD5 ha~(-1)day~(-1)and 408 kg COD ha~(-1)day~(-1)can be considered admissible for HSF-CW operation following a facultative aerated pond.The system presented values for COD,BOD5 and TSS removal of 88%,98.8% and 99.3%,respectively.The system supported operation at a solids application rate of 23.3 g TSS m~(-2)day~(-1)for two years without clogging.The species grown in the CW(Brachiaria mziziensis)presented a biomass produtivity of between 1.86 and 2.55 kg m~(-2)y~(-1),providing CO2 biofixation of between 3.10 and 3.98 kg m~(-2)y~(-1).The present study,conducted over two years,indicates that the HSF-CW model employed,and the operational parameters proposed,can be used in post treatment for a pond system that is not operating satisfactorily.
Henrique Vieira de Mendonqa、Marcelo Henrique Otenio、Alice Azevedo Lomeu
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Post-graduate Program in Agricultural and Environmental Engineering/Institute of Technology/Engineering Department,Federal Rural University of Rio de Janeiro,Campus Seropedica,23890-000,Seropedica,Rio de Janeiro,RJ,Brazil
Embrapa Dairy Cattle,Brazilian Agricultural Research Corporation,36038-330 Juiz de Fora,MG,Brazil
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