×

Waste treatment process

  • US 4,009,098 A
  • Filed: 02/16/1973
  • Issued: 02/22/1977
  • Est. Priority Date: 02/16/1973
  • Status: Expired due to Term
First Claim
Patent Images

1. Process for removing biochemical oxygen demand from waste water by passing the waste water through a bed of microorganisms adapted to oxidize biochemical oxygen demand under aerobic conditions, said bed adapted to pass suspended solids present in said waste water therethrough, comprising:

  • a. generating an upflow fluidized bed of solid particulate carrier having a cultured layer of said microorganisms seeded thereon by passing waste water upwardly through said bed at a flow rate of at least about 6 gallons per minute per square foot of bed to impart to said microorganism attached particles movement within said bed;

    b. providing about 0.1 to 1.5 milligrams of oxygen per milligram of biochemical oxygen demand removed from said waste water in the waste water to allow said microorganisms to reduce the biochemical oxygen demand of the waste water passing therethrough; and

    c. removing excess microorganism growth from said bed particles in order to increase the specific gravity of said particles such that significant amounts of biochemical oxygen demand are reduced from a volume of waste water passing through said bed in 30 minutes or less and floc produced by removal of excess growth is carried from the process without interferring with the efficient operation thereof.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×