 Biological oxidation and flotation apparatus and method |
| OF METHOD AND APPARATUS The apparatus shown in FIGS. 1-5 and 7-13 is designed for use in a sewage ... |
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| Two stage wastewater flotation |
| I claim: 1. A method for removing particulates from wastewater, wherein said particulates comprise ... |
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| Preparation of an animal feed supplement from fish cannery process waste water |
| What is claimed is: 1. A method for the preparation of an animal feed from fish cannery wastes ... |
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| Process for waste water purification |
| OF THE INVENTION This invention is described in greater detail with respect to purification of the ... |
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| Aeration tank for activated-sludge process sewage treatment |
| This invention relates generally to aeration tanks for activated-sludge process sewage treatment ... |
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| Flotation apparatus utilizing a novel floc barrier and current diverting means |
| OF THE PREFERRED EMBODIMENT With reference to FIG. 1, wherein like reference numerals designate ... |
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| Sludge concentration method |
| The primary objective of the present invention is to provide an improved method of atmospheric ... |
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| Renovation of used water from poultry processing plants |
| OF THE INVENTION Referring now to FIG. 1, shown at 10 therein is a block diagram of a process for ... |
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| Two stage traveling bridge filter |
| This invention relates generally to liquid filtration systems and, more specifically, to traveling ... |
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Waste treatment and water recycling toilet system
| Details |
Inventors: Jordan, Edward J.;
Assignee: Thetford Corporation (Ann Arbor, MI)
Primary Examiner: Fisher; Richard V.
Assistant Examiner: Upton; Christopher
Attorney, Agent or Firm: Harness, Dickey & Pierce
A waste treatment and water recycling system that includes a delivery system, a trap, a sump, an anoxic reactor, an aerobic digestion chamber, a filtering system, an adsorption system, a disinfecting system and a water return system. The delivery system includes one or more flush-type toilets and urinals which receive flush water from the water return system and deliver the toilet and urinal waste and flush water to the anoxic reactor. The anoxic reactor contains bacteria which utilizes organics in the toilet waste to convert oxidized nitrogen compounds, such as nitrates, to nitrogen gas, produce bicarbonates and other products. The bacteria, in accomplishing this, lower the organic load on subsequent processes. A denitrified liquid containing bicarbonates and reduced amounts of organics is transferred to the aerobic digestion chamber, which contains biologically active solids and in which organic carbon, organic nitrogen, and ammonium compounds are oxidized by bacteria to obtain a liquid product high in concentration of oxidized nitrogen compounds such as nitrates and low in soluble carbonaceous compounds. This liquid product is filtered, treated with activated carbon, disinfected, and subsequently returned to the toilets and urinals as colorless, clear and odorless flush water containing oxidized nitrogen compounds such as nitrates. A portion of this liquid is recycled directly back to the trap to provide a constant flow of nitrates into the anoxic reactor during periods of toilet usage. The oxidized nitrogen compounds produced in the aerobic digestion chamber insure prevention of odors in the system. |
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DETAILED DESCRIPTION The present invention relates to improvements in waste treatment and water recycling toilet systems, particularly to systems of the general type shown in U.
S.
Pat.
No.
3,950,249, dated Apr.
13, 1976 and U.
S.
Pat.
No.
4,210,528, dated July 1, 1980 both of which are assigned to the assignee of this application.
Municipal-type sewage treatment systems, such as shown in U.
S.
Pat.
Nos.
3,953,327 and 3,964,998, which are commonly referred to as "flow through systems", also have some pertinence to the present invention.
U.
S.
Pat.
No.
3,964,998 shows that it has been known to biologically lower the organic compound concentration in the sewage by treatment for the sewage under anoxic conditions followed by treatment under aerobic conditions.
This sequence has been advantageous in that bacteria in the anoxic reactor utilize organics in the sewage to accomplish the breakdown of nitrates, thus requiring no addition of a supplemental organic source into the system.
However, such a flow through system requires removal of sludge, thus creating the problem of sludge transport and disposal.
Also, in a flow-through system, some of the nitrates resulting from the treatment process flow out of the system and are thus not available for the treatment of organics at the anoxic stage.
As a result, the organic load on the aerobic stage is increased, thus requiring a system with a large size aerobic stage.
Closed loop systems in the past have been advantageous in that no external water supply is needed, thus minimizing the unnecessary usage of potable water.
Difficulties have arisen, however, out of deficiencies in the biological process of these systems.
As a result of these deficiencies, inadequate treatment of wastes often resulted in the production of obnoxious odors and colors in the flush water and a rapid accumulation of biological solids in the system.
The closed loop system disclosed in U.
S.
Pat.
No.
4,210,528 provided a system having effective management of nitrogen in the system so that it could be made of reasonable size, avoid undesirable odors and slow the build-up of solids
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