都市下水二次処理水のリン除去に使用した火山灰土型リン吸着材からのリン回収及び回収リンの肥効

概要

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We examine the collection method for phosphate from volcanic ash soil type phosphorus adsorbent used in secondary effluent. The phosphorus in volcanic ash soil type phosphorus adsorbent is desorbed by 68.9% using 0.5 mol · l-1 H2SO4 solution at a space treatment speed (SV) of 2.5 for 6 h. Phosphorus in the extraction solution can be completely collected by adjusting the pH of the H2SO4 solution to 4.8∼8.7. The major components of the collected phosphorus extract are sodium, aluminum, iron and phosphorus. The total phosphate amount in the collected phosphorus extract is approximately 43.0 gP · kg-1, which is equal to that of a phosphate rock. The citrate-soluble phosphorus in the collected phosphorus extract is estimated to be 80% of the total amount of collected phosphate. Moreover, when the collected phosphorus extract is applied to the subsoil of andosol to grow Brassica campestris cv. Komatsu, its effect is identical to that of superphosphate application. As for the level of application of the collected phosphorus extract, it is found that 6% is suitable. It is proved that the collected phosphorus extract is very promising for soil reduction and reuse.
社団法人　日本水環境学会の論文
2006-12-10