258817 Development of An Adsorbent Derived From Concrete Sludge for Phosphorus Recovery From Waste Water

Wednesday, October 31, 2012: 9:00 AM
331 (Convention Center )
Akihiro Yamasaki, Department of Materials and Life Science, Seikei University, Musashino, Japan, Takeshi Sasaki, Department of Materials and Life Science, Seikei University, Musashino, Tokyo, Japan, Atsushi Iizuka, Research Center for Sustainable Materials & Engineering, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, Japan and Yukio Yanagisawa, Department of Environment Systems, The University of Tokyo, Kashiwa, Chiba, Japan

A solid adsorbent for phosphorus recovery was prepared from concrete sludge. Concrete sludge was diluted with water with dilution ratios ranging from 1 to 15. The diluted concrete sludge was then filtered and dried. Two types of drying methods were examined: natural drying under atmospheric conditions and forced drying in an oven at 105oC. The phosphorus recovery performances of prepared adsorbents were examined using a potassium dihydrogen phosphate (KH2PO4) solution containing 100 mg-P/L as a model of wastewater, which is close to the water effluent produced in the sewage sludge dewatering process. All the adsorbents prepared showed phosphorus recovery performance. The forced drying treatment at 105oC significantly increased the phosphorus recovery rate from the solution. The adsorbent prepared with dilution ratio 10 and forced drying showed the highest phosphorus recovery rate. The final phosphorus concentration in solution was 0.83 mg/L at 4 h from the addition of the optimized adsorbent. These results indicate that the phosphorus adsorbents prepared from concrete sludge are applicable for practical and inexpensive phosphorus recovery processes.

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