Evaluation of Plant Bed Filter Ditches for the Removal of T-N and T-P from Eutrophic Pond Water Containing Particulate N and P
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概要
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Cultivation of useful terrestrial and aquatic plant species in plant bed filter ditches enables to treat domestic wastewater in addition to resource recycling and amenity functions. We reported previously that a ditch planted with papyrus removed N and P most effectively from artificial wastewater. We evaluated the effectiveness of plant bed filter ditches in the treatment of eutrophic pond water, which unlike artificial wastewater, contains particulate N and P. Experimental ditches were planted with papyrus, African marigold, peppermint, and impatience. These plant species were effective in removing N and P from artificial wastewater and could be used by rural communities for the production of handicrafts, cut flowers, and ornamental purposes. The control ditch did not contain plants (plant-free ditch). Pond water was continuously supplied to the ditches at a loading rate of 0.6-0.9 gm^<-2> d^<-1> for N and 0.2-0.35 gm^<-2> d^<-1> for P. In the plant-free ditch, particulate N and P in the influent were removed by passage through the bed filter, unlike NO_3-N and PO_4-P.A larger amount of PO_4-P was dissolved from particulate P in the bed filter. The planted ditches effectively removed NO_3-N, PO_4-P as well as particulate N and P. The planted ditches were able to purify eutrophic pond water, resulting in clear water with a concentration below 0.3 mg L^<-1> for N and 0.02 mg L^<-1> for P, concentrations at which water bloom does not occur. The average removal rate of pollutants by the planted ditches during the experiment, except for the first 2 weeks, was 0.67 gm^<-2> d^<-1> for total N and 0.03 gm^<-2> d^<-1> for total P. We recommend that plant bed filter ditches containing papyrus and flowers be used for ornamental purposes and removal of N and P from pond water along with the supply of clear water as ornamental streams.
- 社団法人日本土壌肥料学会の論文
著者
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Abe Kaoru
Department Of Soils And Fertilizers National Agriculture Research Center
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Abe Kaoru
Department Of Endocrinology National Cancer Center Research Institute
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Ozaki Yasuo
Department Of Electrical Engineering Tokyo Institute Of Technology
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Ozaki Yasuo
Department Of Soils And Fertilizers National Agriculture Research Center
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