Simultaneous Removal of Phosphorus and Algae Using a Pre-coated Filter and Calcined Oyster Shell

다국어 초록 (Multilingual Abstract)

This study focused on the simultaneous removal of algae and phosphorus with using a pre-coated filter and oyster shell powder calcined at 900℃ (COSP). Jar test for optimal dosage, filtration resistance due to algae and field test with a pilot scale pre-coated filter were conducted. 0.15g/L and 0.40mg-PO43-/g were obtained from the jar test with algae sampled at G reservoir for the optimal dosage and phosphorus adsorption capacity of COSP, respectively. The filtration resistance test showed that the average specific filtration resistance was relatively higher than the filter medium resistance. The filtration pressure had more influence on the filter medium resistance than the average filtration resistance, but the solid concentration had more influence on the average filtration resistance than the filter medium resistance. To obtain the simultaneous removal of phosphorus and algae over 97.0% of T-P, 92.5% of S-P, and 98.7% of algae as TSS, the optimized conditions for filtration from the field test are as follows: continuous removal of algae cake, below -0.4bar vacuum pressure, 0.2g/L COSP dose, and 4.1mg-PO43-/g adsorption capacity. Properly calcined oyster shell has excellent phosphorus adsorption capacity, which can be used to reduce algal growth at lakes and reservoirs in combination with pre-coated filter.

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