Treatment of Domestic Waste Water by Multi-Soil-Layering System (Part 5) : The Effect of the Mixtures of Iron Metal Particle and Jute on Simultaneous Removal of Nitrate-N and Phosphate under Non-Submerged Condition

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  • 非湛水下における硝酸態窒素とリン酸の同時除去に対する金属鉄粒とジュート資材の効果
  • ヒ タンスイカ ニ オケル ショウサンタイ チッソ ト リンサン ノ ドウ

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Abstract

Five or 10 weight percentages of 10-20 mesh metal iron was mixed with Masa soil materials (soils derived from weathered granite) to strengthen phosphate absorption capacity. The mixture was packed into jute nets (dimensions: 3×5×10cm). Each of the jute units was surrounded by layer of Zeolite particle of 1-3mm diameter to make a brick pattern with 9 layers in acrylic tank (dimensions: 10×45×45cm). A model waste water containing 40 mg/l of nitrate-N and 20 mg/l phosphate-P was treated at the rate of 50-750 l/m^3/day under non-submerged condition. The system showed the rate of nitrate-N removal 21 g N/m^3/day. Since the treatment was done under non-submerged condition, formation of COD component was only 12 mg/l at the mean level. The percentage of phosphate P removal was 99%. The mixture of metal iron and jute without any addition of soil showed efficient removal of nitrate-N and phosphate-P in column experiment under non-submerged condition. The rate of nitrate-N removal was 47 g N/m^3/day and at the same time 97% of the phosphate-P was removed under the rate of treatment at 1,200 l/m^3/day.

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