Waste water treating apparatus

Patent · Tue Jan 10 04:00:00 EST 1984

OSTI ID:6585502

Fujimoto, T; Kawasugi, T

A waste water treating apparatus includes a circulation type aeration tank having a downward flow chamber and an upward flow chamber extending in the depth direction and communicating with each other at the upper and lower ends thereof. An oxygen containing gas is supplied to the downward flow chamber and waste water and return sludge are supplied to a given position or elevation of the upward flow chamber to be mixed with a mixed liquor flowing through the upward flow chamber, whereby a reduction zone with a low concentration of dissolved oxygen is formed at the upper portion of the upward flow chamber. Denitrification takes place in the above described reduction zone.

• Assignee: Kubota, Ltd. (Japan)
• Patent Number(s): US 4425231
• OSTI ID: 6585502
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
520200* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AERATION
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CONTAINERS
DENITRIFICATION
DESIGN
ELEMENTS
FLUID FLOW
FLUIDS
GAS FLOW
GASES
HYDROGEN COMPOUNDS
LIQUID WASTES
NITROGEN
NONMETALS
ORGANIC MATTER
OXYGEN
OXYGEN COMPOUNDS
SEPARATION EQUIPMENT
SLUDGES
TANKS
WASTE WATER
WASTES
WATER
WATER TREATMENT