Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Material level or thickness responsive
Reexamination Certificate
1999-04-23
2001-05-01
Walker, W. L. (Department: 1723)
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Material level or thickness responsive
C210S097000, C210S150000, C210S195100, C210S205000, C210S207000, C210S220000, C210S258000, C210S259000, C210S151000, C439S462000, C285S151100
Reexamination Certificate
active
06224752
ABSTRACT:
TECHNICAL FIELD
The present invention relates to wastewater treatment systems. More particularly, the present invention related to wastewater treatment systems which utilize an aeration tank. Furthermore, the present invention related to wastewater treatment systems having electrical connections extending to switches within the tanks and extending to a pump. Furthermore, the present invention relates to wastewater treatment systems which include junction boxes for the connection of various electrical lines within the interior of the tanks.
BACKGROUND ART
Recently, home wastewater treatment systems have become increasingly popular. Prior to the development of home wastewater treatment systems, septic tanks were the conventional manner of cleaning home and small commercial establishment wastes from the water. In view of the great cost associated with connecting a home sewage system with the city sewage system, it is economically beneficial to employ the use of home wastewater treatment systems. Present home wastewater treatment systems are a down-sized, underground version of the treatment processes employed by large central treatment plants.
Essentially, the treatment process correlates with an example found in nature. When a creek runs through rocks and over logs, turbulence is created and oxygen is captured. Aerobic bacteria utilize oxygen in their digestion processes. This allows the creek to purify itself. The home wastewater treatment systems simply employ a speeded-up version of this process in a manner known as “extended aeration”. Air or oxygen is brought in by means of an efficient air pump and then diffused into thousands of tiny air bubbles by means of fine air diffusion. As these tiny bubbles move upward through the wastewater, oxygen is captured and the same purification process takes place. Such a system can allow normal household waste water to be reduced to a clear odorless liquid.
One such system has been manufactured and sold by Hydro-Action, Inc. of P.O. Box 12583, Beaumont, Tex. The system is known as the HYDRO-ACTION™ system. It is a self-contained automatic system. The HYDRO-ACTION™ system incorporates two separate compartments, each performing a specific function in the digestion process. First, raw waste water enters the aeration compartment and is mixed with activated sludge and aerated. An air pump injects large quantities of air into this compartment by means of porous ceramic diffusers located above the bottom perimeter of the aeration compartment. These diffusers create thousands of tiny air bubbles which provide oxygen for the aerobic digestion process and mixes the compartment's entire contents. These tiny bubbles provide better air-to-liquid contact so as to hasten the aerobic digestion process. Aerobic bacteria then use the oxygen in solution to break down the wastewater so as to convert the wastewater into an odorless liquid and gas. Hydraulic displacement causes the mixture to enter the second and final compartment. Due to the calm conditions and sloping walls of the clarification compartment, any remaining settleable material is encouraged to return to the aeration compartment for further treatment. The remaining effluent, upon reaching the outlet piping, is clear and odorless.
This HYDRO-ACTION™ system allows homes to be built on clay soil, rock or high water tables. This system also helps to protect the ground water supplies and eliminates gross pollution of ditches and streams. The effluent discharged from such a system is allowed by some state and local regulatory agencies to be discharged directly to a stream or pond or used to surface irrigate lawns and pastures. In areas where surface discharge is not allowed, subsurface disposal methods can be used with good success.
Conventionally, in such extended aeration treatment systems, a control panel is connected to the wastewater treatment system so as to control and monitor the conditions within the treatment tank. An air pump is also used so as to supply air to the aerators and diffusers within the aeration compartment of the tank. The control panel is typically electrically connected to the air pump so as to monitor the pressure delivered by the air pump. In conventional practice, a wastewater treatment tank will be buried in the earth a suitable distance away from a home or a commercial establishment. Since these wastewater treatment tanks are relatively large (at least 500 gallons capacity), a significant hole must be formed in the earth so as to accommodate the wastewater treatment system. After the wastewater treatment system is installed into the earth, only the cover of the access opening of the tank will be exposed above the earth. In normal practice, the control panel will be placed onto a wall of the home or commercial establishment or upon a pedestal. The air pump will be placed in a location generally adjacent to the wall of the commercial establishment or home. So as to allow the electrical lines from the control panel to reach the tank, it is necessary to trench the earth so as to allow conduits to extend from the home or commercial establishment to the tank. Similarly, trenching must be carried out in the earth so as to allow the air lines from the air pump to pass to the treatment tank. Additional trenching may be required so as to allow the electrical lines from the control panel to be connected to the air pump.
This process of trenching the earth is a very time consuming and tedious process. Many homeowners are reluctant to allow such trenching to occur. Typically, the installers of such extended aeration wastewater treatment systems will take shortcuts in the installation of the electrical conduits and air lines. Under certain circumstances, these lines will cross in the earth. In other circumstances, separate trenches will not be formed for the electrical lines and for the air lines. Instead, the installer of the extended aeration wastewater treatment system will simply attempt to place the air lines and the electrical lines together in a single trench. This practice is improper since the crossing of the air lines and the electrical lines can pinch the air lines so as to reduce air flow to the aeration system. Furthermore, when the electrical lines and the air lines are installed in this manner, any settling of the earth will cause the air line to become pinched.
Normally, the air pump must be placed on a graded surface. As such, the installer must grade a section of the earth so as to allow for the placement of the air pump on a level surface. Under certain circumstances, the air pump will be placed upon a concrete base so as to be properly supported in a desired position above the earth. The installation of the air pump and the construction of the base for the air pump takes a great deal of time during the installation of such aerobic wastewater treatment systems.
When the control panel is installed onto the wall of the house, it is necessary for the installer to drill holes in the wall of the house and to position the control panel in a desired location. Under certain circumstances, the homeowner may not wish to have a control panel placed on the wall of the house. Under other circumstances, the placement of the control panel on the wall of the house is in a difficult to reach or otherwise undesirable location. In any event, a great deal of labor is required to properly place the control panel on the house.
In the installation of the control panel and the air pump, the installer is required to have a suitable level of knowledge of electrical circuitry. This knowledge is required so as to allow the installer to properly connect the electrical line to the air pump components and to the treatment tank components. Wires must be extended over a great deal of distance within conduits so as to allow the proper electrical connections to be made. If an improper electrical connection is made, then the aerobic wastewater treatment system will not function in the desired manner. In other circumstances, short circuits can occur if the electrical lines are not installed prop
Aqua Partners Ltd.
Cecil Terry K.
Harrison & Egbert
Walker W. L.
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