Experiment of Removing Traces of Phosphorus in Water Using Bottom Sludge of Ise-Bay

Large amounts of sludge has accumulated in the Inner Bay, which is one factor of environmental deterioration. We found that this sludge has an effect of absorbing low concentrations of phosphorus in water. For the purpose of development of water treatment agents and effective utilization of the sludge, phosphorus removal performance was investigated using wet sludge collected in Ise-Bay. A small amount of sludge was added to the test water having a phosphorus concentration of about 1~2 mg/L, and the phosphorus concentration of the filtrate after stirring and filtration was measured. Depending on the sludge conditions, it showed 30% to 80% of phosphorus removal performance. We investigated the relationship between the physical properties of the sludge and the removal performance.