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Biological method of phosphorus removal and biological phosphorus-removing apparatus

  • US 6,706,185 B2
  • Filed: 05/22/2002
  • Issued: 03/16/2004
  • Est. Priority Date: 05/22/2002
  • Status: Expired due to Fees
First Claim
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1. A biological method of removing phosphorus from raw water, comprising:

  • releasing phosphorus from activated sludge in a first anaerobic tank in a phosphorus-releasing step, absorbing the phosphorus with activated sludge in a mixed liquor of the raw water and the activated sludge in an aerobic tank in a phosphorus-absorbing step, separating sludge from the mixed liquor in a first solid/liquid separation step, supplying the sludge which has been concentrated and separated from the mixed liquor in the first solid/liquid separation step to a second anaerobic tank in a second phosphorus-releasing step, subjecting the sludge from the second phosphorus-releasing step to a second solid/liquid separation step, solubilizing sludge which has been concentrated and separated in the second solid/liquid separation step in a solubilizing step, supplying at least some of the sludge which has been solubilized in the solubilizing step to the first anaerobic tank, supplying at least some of the sludge which has been solubilized in the solubilizing step to the second anaerobic tank, and removing phosphorus from liquid which has been separated in the second solid/liquid separation step.

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