植物-濾材系水路によるバラ切り花ロックウール栽培排液の再利用及び浄化

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Recently, the soilless culture system has been popularized rapidly in Japan. Because the discharged culture solution from the soilless culture system contains extremely high concentrations of N and P, continuous discharge of the nutrient solution is considered to partly contribute to ground water pollution and eutrophication of aquatic ecosystems. We conducted an experiment to apply plant bed filter ditches for reuse and removal of N and P from the discharged nutrient solution. Three plant species (sorghum (Sorghum vulgare Pers.), water spinach (Ipomea aquatica Forskal), and portulaca (Portulaca oleracea L.)) were evaluated and compared in terms of their ability to remove N and P from feeding solution discharged from a rose soilless culture system using rock wool as the bed. The nitrogen removal rate was maintained high about 2.0 g m^<-2> d^<-1> in the ditch planted with sorghum or water spinach during August to October. In November, the water spinach ditch and the portulaca ditch removed very little nitrogen, while the sorghum ditch was still effective for removing nitrogen. Total organic carbon concentration, dissolved oxygen concentration, and the nitrogen balance indicated that desitrification contributed largely to nitrogen removal in the sorghum ditch. The water spinach ditch showed the highest phosphorus removal efficiency during August to October. Based on the nitrogen removal rate in the water spinach ditch, it was estimated that a plant bed filter ditch with an area of approximately 35 m^2 could remove 65% of nitrogen and 90% of phosphorus discharged from a rose soilless culture system with an area of 1,000 m^2 during August to October.
社団法人日本土壌肥料学会の論文
2003-06-05

植物-濾材系水路によるバラ切り花ロックウール栽培排液の再利用及び浄化

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