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Seven companies including our company jointly carried out the demonstration tests of the phosphorus recovery system by the apatite method. The system recovers phosphoric acid, included in water that biologically treated human waste and septic tank sludge, as hydroxy apatite crystal through the apatite method. The apatite method used for this system is a method for making the crystal of a hydroxy apatite from phosphoric acid which exists in that water by adding the calcium agent and the sodium hydroxide respectively. The demonstration tests have been carried out for eight months, and found the optimum operating condition for a high phosphorus recovery with an acceptable quality of the treated water.
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