Waste treatment for phosphorous removal

• US 3,386,911 A
• Filed: 08/03/1966
• Issued: 06/04/1968
• Est. Priority Date: 08/03/1966
• Status: Expired due to Term

• Current Assignee: Orris E. Albertson
• Original Assignee: Orris E. Albertson
• Inventors: Albertson, Orris E.
• Application Number:
  US04/570,017
• Time in Patent Office: 671 Days
• US Class Current: 210/624
• CPC Class Codes: C02F 1/5236 using inorganic agents
• CPC Class Codes: C02F 3/02 Aerobic processes
• CPC Class Codes: C02F 3/1215 Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage
• CPC Class Codes: Y10S 210/906 Phosphorus containing

Claims

1. A COMBINED CHEMICAL AND BIOLOGICAL PROCESS FOR TREATING LIQUID ORGANIC WASTE MATERIAL CONTAINING PHOSPHOROUS, TO DECREASE THE PHOSPHORUS CONTENT TO A PREDETERMINED MINIMUM CONCENTRATION, COMPRISING THE STEPS OF DOSING THE RAW WASTE MATERIAL WITH A LIMITED AMOUNT OF A CHEMICAL PRECIPITANT FOR PHOSPHORUS SUBSTANTIALLY LESS THAN THE AMOUNT REQUIRED TO REMOVE PHOSPHORUS TO THE PREDETERMINED CONCENTRATION TO FORM AN INSOLUBLE PRECIPITATE OF PHOSPHORUS;

SUBJECTING THE DOSED WASTE MATERIAL TO A FIRST SEDIMENTATION TO SEPARATE THE MATERIAL INTO SLUDGE AND AN EFFLUENT;

AERATING THE EFFLUENT TO PRODUCE PHOSPHORUS CONSUMING CELL GROWTH, SUBJECTING THE AERATED EFFLUENT TO A SECOND SEDIMENTATION TO REMOVE THE PHOSPHORUS-BEARING BIOLOGICAL SLUDGE AND PRODUCE A FINAL EFFLUENT OF THE PREDETERMINED MINMIUM PHOSPHORUS CONCENTRATION.