System for providing homogeneous polymer-sludge composition to dewatering equipment

Abstract

An improved system for providing a homogenous polymer-sludge composition to dewatering equipment includes an input mechanism that is adapted to receive sludge from a first supply source, and polymer materials from a second supply source. The input mechanism functioning to perform an initial blending of the materials before discharging the same to a pump unit. The pump unit comprising a boundary layer viscous drag pump that functions to efficiently and simultaneously mix and pump the polymer/sludge material to dewatering equipment in a manner that does not shear the polymer or reduce the efficiency, as previously experienced with downstream mixing units.

Claims

1. A system for providing a homogeneous polymer-sludge composition to dewatering equipment, said system comprising: an inlet unit having a first input member for receiving sludge, a second input member for receiving polymer, a central channel that is configured to perform a first mixing procedure, and an output member; and a boundary layer viscous drag disc pump having an input that is in direct communication with the output member of the inlet unit, said pump being configured to pull a solution from the output member, to perform a second mixing procedure on the solution, and to supply a homogeneous polymer-sludge composition to a piece of dewatering equipment.

2. The system of claim 1, wherein the central channel comprises a polymer injection ring.

3. The system of claim 2, further comprising: a pump for introducing the polymer to the second input member.

4. The system of claim 1, wherein the central channel comprises an hourglass shape that functions to create a venturi effect on the sludge and polymer.

5. The system of claim 4, wherein the inlet unit is constructed from steel.

6. The system of claim 1, holding tank that is in communication with the first input member, said holding tank being configured to store the sludge.

7. The system of claim 1, further comprising: a wherein the piece of dewatering equipment is in direct and uninterrupted communication with an output of the boundary layer viscous drag pump.

8. The system of claim 7, wherein the piece of dewatering equipment comprises a belt filter press.

9. The system of claim 1, wherein the boundary layer viscous drag pump is configured to operate at a pressure of between 5 to 10 psi.

10. A method for providing a homogeneous polymer-sludge composition to dewatering equipment, said method comprising: providing sludge to a first input member of an inlet unit; providing polymer to a second input member of an inlet unit; performing a first mixing procedure at the inlet unit; connecting an output of the inlet unit directly to an input of a boundary layer viscous drag disc pump; performing a second mixing procedure at the boundary layer viscous drag pump; and pumping an output of the boundary layer viscous drag disc pump directly to a piece of dewatering equipment.

11. The method of claim 10, further comprising: wherein the pumping step is performed at a pressure of between 5 to 10 psi.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Presently preferred embodiments are shown in the drawings. It should be appreciated, however, that the invention is not limited to the precise arrangements and instrumentalities shown.

(2) FIG. 1 is a simplistic block diagram of a wastewater dewatering process, in accordance with background art.

(3) FIG. 2 is a simplistic block diagram of a wastewater dewatering process, in accordance with one embodiment of the present invention.

(4) FIG. 3 is another simplistic block diagram of a wastewater dewatering process, in accordance with one embodiment of the present invention

DETAILED DESCRIPTION OF THE INVENTION

(5) While the specification concludes with claims defining the features of the invention that are regarded as novel, it is believed that the invention will be better understood from a consideration of the description in conjunction with the drawings. As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the inventive arrangements in virtually any appropriately detailed structure. Further, the terms and phrases used herein are not intended to be limiting but rather to provide an understandable description of the invention.

(6) FIG. 2 illustrate one embodiment of an improved system and method for providing homogenous polymer-sludge composition to dewatering equipment in waste water treatment facilities 100 that are useful for understanding the inventive concepts disclosed herein. In each of the drawings, identical reference numerals are used for like elements of the invention or elements of like function. As shown, the system 100 can include, essentially, a holding tank 1, an inlet unit 20 and a pumping unit 30 that are in communication with dewatering equipment 4.

(7) In one embodiment, the inlet unit 20 can include, comprise or consist of a first input member 21 for receiving sludge from a holding tank or other supply source, and a second input member 22 for receiving a polymer material from another tank or supply source. The inlet unit 20 can also include a central channel 23 wherein the materials from the first and second inlet units can be combined, before being discharged by an output member 24 that can be connected directly to the below described pumping unit 30 or other fluid delivery member, such as distribution pipes, for example.

(8) In one embodiment, the inlet unit 20 can include or comprise a venturi valve having a central channel 23 with a generally hourglass shape that creates a venturi effect wherein the constricted portion 23a functions to increase the velocity of the materials passing therethrough. The constricted portion also functions to disturb the flow of the material, so as to perform a first mixing step of the materials received from the first and second input members, before outputting the same at an increased velocity.

(9) Owing to the intended use and operation of the inlet unit 20, it is preferred that the same be constructed from a sturdy material such as steel, for example, that is suitable for use with liquids under pressure. Of course, any number of other shapes, sizes and construction materials are also contemplated.

(10) Although described above as including a venturi valve, other devices capable of receiving the polymer and sludge materials and performing the first mixing step are also contemplated. For example, FIG. 3, illustrates one embodiment of the system 100, wherein the inlet unit 20 can comprise a polymer injection ring 25 or similar device, having a first input member 25a for receiving sludge from a holding tank or other supply source, a second input member 25b for receiving a polymer material, and an output member 25c that can be connected directly to the below described pumping unit.

(11) In one embodiment, a polymer feed pump 26 may be provided to pump the polymer to the inlet unit 20. Such a feature advantageously allows a system operator to monitor and/or regulate the amount and flow of polymer through the system. In operation, the injection ring can function to simultaneously receive the separate sludge and polymer materials, before outputting the same to the pump. In this regard, the sludge and polymer materials undergo a first mixing step prior to being introduced into the pump. Of course, other embodiments are contemplated wherein other mechanisms are used to perform the first mixing step and to introduce the materials to the pump 30.

(12) In either instance, the pumping unit 30 can preferably include, comprise or consist of a pump that operates on the principles of boundary layer and viscous drag, such as a Tesla Pump, a Disc Pump, or a boundary layer viscous drag disc pump, for example. As will be known to those of skill in the art, such pumps include an internal disc that creates a powerful force for pulling a product through the pump in a smooth, gentle, non-impingement and pulsation-free flow. Moreover, the boundary layer viscous drag pumping principle of the pump during this pulling procedure functions to perform a second mixing procedure that thoroughly blends the sludge and polymer materials together, so as to create a homogenous output that can be distributed directly to the dewatering equipment.

(13) One nonlimiting example of a commercially available pump that can be utilized with the above described system includes the model 403-12-2HHD Disc Pump that is commercially available from DiscFlo, for example.

(14) By eliminating the use/need for a separate mixer machine to be located between the pump and dewatering equipment, the present system is capable of pumping the materials at lower pressures, typically 5-10 psi, directly to the dewatering equipment 4. Moreover, because the material exiting the pump is not sheared, less polymer is likely to be needed to produce the homogenous blend. Such features result in a tremendous savings in terms of raw material (e.g., polymer), cost of machinery (e.g., absence of the mixer), and power consumption.

(15) As described herein, one or more elements of the system 10 can be secured together utilizing any number of known attachment means such as, for example, screws, glue, compression fittings and welds, among others. Moreover, although the above embodiments have been described as including separate individual elements, the inventive concepts disclosed herein are not so limiting. To this end, one of skill in the art will recognize that one or more individually identified elements may be formed together as one or more continuous elements, either through manufacturing processes, such as welding, casting, or molding, or through the use of a singular piece of material milled or machined with the aforementioned components forming identifiable sections thereof.

(16) As to a further description of the manner and use of the present invention, the same should be apparent from the above description. Accordingly, no further discussion relating to the manner of usage and operation will be provided.

(17) The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms a, an, and the are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms comprises and/or comprising, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Likewise, the terms consisting shall be used to describe only those components identified. In each instance where a device comprises certain elements, it will inherently consist of each of those identified elements as well.

(18) The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the invention. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.