Liquid purification or separation – With means to add treating material – Directly applied to separator
Reexamination Certificate
1999-04-15
2001-08-07
Lithgow, Thomas M. (Department: 1724)
Liquid purification or separation
With means to add treating material
Directly applied to separator
C210S194000, C210S195100, C210S201000, C210S202000, C210S205000
Reexamination Certificate
active
06270665
ABSTRACT:
FIELD OF THE INVENTION
This invention is related to organic waste fluid aeration tanks and aeration apparatuses, with special regard to the liquid waste, excreta, etc., of livestock.
BACKGROUND OF THE INVENTION
Environmental pollution due to livestock excreta has become an increasingly large problem in recent years. In the past, various activated sludge apparatuses for organic waste fluid processing, including livestock wastes, have been proposed. The high cost of activated sludge apparatuses, however, makes it difficult for livestock raisers to employ them. Further, the handling of reactors used in the treatment process, the nutrition source/microorganism loading ratio, and selection of the mean residence time within the tank are difficult. The most difficult problem is an interference with sludge sedimentation due to increases of fibrous microorganisms. The maintenance of dissolved oxygen levels in the aeration tanks, the regulation of the cycling volume of activated sludge and the control of waste activated sludge are difficult. Fine bubbles are thought to be better in promoting the conveyance efficiency of oxygen. The distinction between fine and coarse is, however, ambiguous, making appropriate control impossible. Further, not only is the treatment time from the introduction of raw liquid to discharge lengthy; it also takes an inordinate amount of time to produce a non-offensive smelling and biochemically stable quality nutritious source. The establishment of an economical and structurally simple excretory liquid treatment system for livestock is still some time off; therefore, a dependence upon such primitive methods as natural decomposition using trench holes or aeration continues to be necessary.
Natural decomposition utilizing trench holes, however, causes ground water contamination, and forced aeration utilizing concrete frames requires an extended period of time to purify excretory liquid to effluent quality, making it an inefficient method due to the lengthy digestive time required by microorganisms.
The present invention alleviates the above mentioned problems by being non-polluting and by providing inexpensive organic liquid through an efficient purification system.
SUMMARY OF THE INVENTION
The aeration tank of this invention returns a portion of adhered organic substances and bubbles to its outer tank after treatment in its aeration tube. The aeration tube is installed within the outer tank. Suction holes are set at the base of the aeration tube wall and scatter holes are positioned at the upper end of the tube wall. An air diffusion head, coupled to a blast pipe, is inserted into the base of the tube. A further tube, designed to carry away bubbles expelled upward from the aeration tube, is fitted to the top end of the tube. The organic waste fluid aeration apparatus employed in the above mentioned aeration tank constitutes a quick and continuous automatic system for the removal of solid organic substances suspended in waste fluid.
The system functions in the following manner: At least two of the above mentioned aeration tanks are utilized in tandem or series. One unit functions as the collected bubble mixture aeration tank. Liquid to be treated is received into the outer tank from the raw liquid adjusted tank. It is then received into the aeration tube where it is aerated by a mixture of collecting bubbles. The generated bubbles are then expelled into a sludge sedimentation tank. The second unit receives supernatant liquid from the sludge sedimentation tank directly into its aeration tube via an initial return tube. Subsequent units receive liquid directly into their aeration tubes from the outer tank of the aeration tanks directly preceding the receiving units. A portion of the organic substances attached to bubbles generated by each aeration tube is scattered back into its respective outer tank and a portion is conducted to the collected bubble mixture tank. The overflow from the final aeration tank is collected in the treated liquid reservoir tank.
If only one aeration treatment unit is employed in conjunction with a collected bubble mixture tank, liquid expelled into the outer tank is delivered directly into the treated liquid reservoir tank. When two units are employed, expelled liquid is delivered into the treated liquid reservoir tank only from the outer tank of the second aeration tank. The more aeration tanks utilized, the more the waste fluid is purified. From an economic perspective, however, the optimum number of units is from two to four. Three units should provide an acceptable level of purity.
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Okada Yoshiichi
Shim Jae-Do
Lithgow Thomas M.
Sheridan & Ross P.C.
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