WO2019103590A1

WO2019103590A1 - Bidirectional automatic skimmer for wastewater treatment tanks

Info

Publication number: WO2019103590A1
Application number: PCT/MX2017/000136
Authority: WO
Inventors: Francisco Xavier VALDÉS SIMANCAS
Original assignee: Valdes Simancas Francisco Xavier
Priority date: 2017-11-22
Filing date: 2017-11-24
Publication date: 2019-05-31
Also published as: MX2017014993A

Abstract

The present invention relates to a bidirectional automatic skimmer for wastewater treatment tanks, characterised in that it comprises a collection channel with sealing plates at both ends and the side walls thereof defining a pair of upper flanges that define therebetween an open upper central mouth; wherein the inner edges of said upper flanges are suitable for receiving respective longitudinal paddles pivotably attached by means of a hermetic, flexible hinge, being tilted in the inoperative position to prevent the passage of water into the collection channel; a longitudinal shaft supported by a pair of ball-bearings is provided along said upper mouth and comprises respective diametrically opposed cams that support the inner edges of said longitudinal paddles; wherein said shaft comprises at one of its ends a vertical lever to which the end of a stem of an actuator is attached in order to rotate same partially in one sense or another, so that said cams partially lower a longitudinal paddle until it becomes coplanar with the surface of the water, allowing the passage of suspended solids and a small percentage of water; said collection channel comprises at the bottom an opening for discharging the collected scum; and wherein said skimmer also comprises at least one support structure for attaching the bidirectional automatic skimmer for wastewater treatment tanks.

Description

BIDIRECTIONAL AUTOMATIC SCRAPER FOR WASTE TREATMENT TANKS

FIELD OF THE INVENTION

The present invention falls in the field of wastewater treatment; in general it is related to the means and devices used in wastewater treatment plants and more specifically it is referred to a bidirectional automatic skimmer for wastewater treatment tanks to drag the floating material to the grease hopper or foam collector.

BACKGROUND OF THE INVENTION

Biological processes, both aerobic and anaerobic, are widely used in the treatment of wastewater for sanitation; aerobic processes are usually carried out in the upper part of water treatment tanks, where aerators are required to aerate the water; for this purpose, biological contact rotors (RBC) are used, which in the first stages carry out the degradation of the remaining organic matter of the water coming from an anaerobic treatment and in the last stages it allows the growth of different nitrifying bacteria (nitrosomes and nitrobacter ) that convert ammoniacal nitrogen into nitrites and later into nitrates that will become gas nitrogen in the anoxic zone.

The degradation of organic matter in the biological processes of wastewater treatment for sanitation generates foams, fats, and creams that float on the surface of the water in tanks, ponds or other deposits designed for this purpose. There are various equipment in the market that perform the same function, but in a different way and their structures, construction, configuration and ways of operating are very different from that of the present invention. They are known for example by their skimmer trade names such as the Delta Skimmer, Scum Pipe, Scum Skimmer, among others, which are inefficient due to the fact that they extract creams together with a lot of water, which causes them to have to acquire additional equipment to make a more thorough separation between suspended solids and water for final disposal.

A search was made to determine the state of the closest technique, finding the following documents:

The document KR100789174 of Ko Young Goo of January 2, 2008 was placed (which for reference we have denominated it as document D 1), this document discloses a device of elimination of slag to maximize the profitability in operation and handling of the installations by adjusting the water level of a slag hopper so that the slag is collected and removed by the simple handling of a handle. The device for slag removal comprises: a frame (1) which is fixed to a top wall surface of a flocculator (15), and which has through-hole type guide holes (8) formed on both sides of the same and a rectangular nut (11) formed in a central part thereof; guide shafts (6) which can move vertically along the guide holes, and which have plugs (7) formed at their upper ends; an axle pin (3) passing through the rectangular nut, and having a handle (4) formed at an upper end thereof, and a cylindrical joining protrusion formed at a lower end thereof; a joining element (9) having a space part formed therein for fitting joint protuberances formed in the lower ends of the guide shafts in the space part such that the joining member joins the protrusion at the lower end of the shaft bolt and the connecting element is inactive in the space part without being separated from the space part; a fixing member (12) integrally fixed to the guide shafts; and a slag hopper (2) which is integrally fixed to a lower part of the fixing member, and which has an inlet hole (13) formed on an upper part of its front face to flow in slag through the inlet orifice. and a flexible hole (14) formed in a lower part thereof to flow slag through the flexible conduit. While a device for eliminating slag or cream is disclosed, it simply comprises a hopper with an upper opening where the creams are decanted and means for adjusting and adjusting their height. Said document D1 does not disclose, nor suggest a bidirectional automatic skimmer with the same structure, configuration, arrangement of components, way of operating as that of the present invention, therefore, our invention is new on the invention disclosed in the document D1.

Based on the information disclosed in document D1 alone, a person with average knowledge in the matter will not be enabled so that based on the information disclosed in said document D1, can clearly deduce our invention; thus our invention complies with inventive activity on said document D1.

The document KR2005116880A (which for reference we have named it as document D2) of Ryoo In Sang and Lee Shin Jae of December 13, 2005, was also located, this document reveals a slag elimination device installed in a water disposal plant wastewater or a water treatment plant to discharge only the slag that floats to the top of the wastewater that flows into a water channel. The device includes a slag hopper which is located within the water channel and leaves the slag and flows out of the water channel through a discharge tube formed in its lower part; an ascending and descending section to raise and lower the slag hopper; a support part supported on the upper side of the water channel to support the ascending / descending portion; a slag detection sensor installed in a front part of the slag hopper to detect the amount of floating scum; a water level sensor installed in a back part of the slag hopper and that detects a water level; and a controller for controlling the elevation of the slag hopper by controlling the ascending and descending part according to the detection status of the slag sensor and the water level sensor.

As can be seen, the invention of document D2 discloses a slag or cream elimination device that defines a hopper that regulates its height with respect to the level of the floating creams and comprises an automatic detection system for creams and water level and means of Hopper lift control automatically by a support structure; but it never reveals, the same mechanisms that allow manually adjusting the blocking elements of the floating creams, and the mechanisms of operation to move adjustment blades that allow the entry of creams and a system of handling and extraction of the creams.

Said document D2 does not disclose, nor suggest a bidirectional automatic skimmer with the same structure, configuration, arrangement of components, way of operating as that of the present invention, therefore, our invention is new on the invention disclosed in the document D2. Based on the information disclosed in document D2 by itself or its combination with document D2, a person with average knowledge in the matter would not be enabled so that based on the information disclosed in said document D2, can clearly deduce our invention; thus our invention complies with inventive activity on said document D2.

The document US8303812 B2 of Fang Chao, of June 20, 2011, was also placed (which we refer to as reference D3 document), which discloses a method and device for removing floating matter such as mud located near the surface of a fluid body that uses pneumatic force to remove the floating matter. The device is configured to provide a uniform air flow through the inlet channel. The input channel of the device may also include an adjustable section, or a fixed section and an air flow damper, which allows the flow of air along the channel to be controlled periodically. There are also portable devices for removing said floating matter from the surface of a body of water.

Said skimmer device comprising: a skimmer body including an outlet opening for attaching the skimmer body to an air blower; an elongate entry channel comprising an upper section and a lower section, wherein the lower section has a curved upper surface, the upper surface curved concave downward relative to a horizontal plane; An air flow distribution mechanism, adapted to provide a substantially uniform air flow along the elongated inlet channel; And a camera to collect material extracted through the elongated entrance channel. Said document 03 contemplates an inventive principle that makes use of a pneumatic force to lift and blow the floating matter in an entrance channel, and in this way to be able to remove floating matter, such as mud located near the surface of a fluid body.

Said document D3 does not disclose, nor suggest a bidirectional automatic skimmer with the same structure, configuration, arrangement of components, way of operating as that of the present invention, therefore, our invention is new on the invention disclosed in the document D3.

Based on the information disclosed in document D3 alone or combined with the subject matter disclosed in documents D1 and D2, a person with average knowledge in the matter would not be enabled so that based on the information disclosed in said documents D1 to D3 by separated or its combination, can clearly deduce our invention; thus our invention complies with inventive activity on said documents D1 to D3.

Given the need to have other alternatives for the removal of foams, fats, and creams that float on the surface of water in tanks, ponds or other deposits for the treatment of wastewater for the degradation of organic matter for sanitation, was that the bi-directional automatic skimmer for wastewater treatment tanks was developed that solves the deficiencies and disadvantages offered by other technologies. OBJECTIVES OF THE INVENTION

The main objective of the present invention is to make available a bidirectional automatic skimmer for wastewater treatment tanks that allows capturing water in low quantity, foams, fats, and creams that float on the water surface in tanks, ponds or other deposits of wastewater treatment, in such a proportion that the volume of water is minimum and the elements suspended and separated can be sent to final disposal without any additional separation process.

Another objective of the present invention is to make available said bidirectional automatic skimmer for wastewater treatment tanks, which also allows its height adjustment to be adjusted depending on the amount of creams generated in the water treatment tank.

Another objective of the present invention is to make available said bidirectional automatic skimmer for wastewater treatment tanks, which also has a suspended solids concentrator that does not require any element that forces them to reach a gutter rather than by dragging by the action of the water flow. Another objective of the present invention is to make available said bidirectional automatic skimmer for wastewater treatment tanks, which is also structurally simple, easy to operate and maintain. Another objective of the present invention is to make available said bidirectional automatic skimmer for wastewater treatment tanks, which can also be manipulated and moved to be placed in different tanks where it is required to eliminate the creams suspended in. the surface derived from wastewater treatment processes.

And all those qualities and objectives that will become apparent when making a general and detailed description of the present invention supported by the illustrated modalities.

BRIEF DESCRIPTION OF THE INVENTION The bidirectional automatic skimmer for wastewater treatment tanks, in accordance with the present invention consists of an elongated collector channel preferably substantially trapezoidal in shape, sealed at both ends by sealing plates and with a perpendicular fold in the area top of each of the side walls defining a pair of upper brows projected toward the central area which in turn define a central upper mouth open therethrough along the entire length of said collector channel; wherein said upper eyebrows are adapted to receive respective longitudinal paddles extending the entire length of said collecting channel and are pivotally fixed by means of a hermetic and flexible joint at the internal edges of said upper eyebrows; and wherein said longitudinal vanes obstruct the upper channel avoiding the passage of water into the collector channel in the standby mode. Said longitudinal vanes being arranged substantially inclined at an angle of approximately 10 ° on the horizontal in rest position to prevent the passage of water into the collecting channel.

In the upper central part of said collector channel there is a longitudinal axis supported at its ends in a pair of bearings fixed in said sealing plates and comprising diametrically opposed cams distributed along its entire length adapted to support the internal edges of said longitudinal vanes and maintaining them with the described inclination sealing the upper channel in position in rest mode. Said longitudinal axis comprising at one of its ends a vertical lever with an upper groove where the end of the rod of a hydraulic or pneumatic actuator is fixed that when operated to extend or retract rotates in one direction or another to said longitudinal axis that by means of the cams It partially lowers a longitudinal blade through its hermetic and flexible articulation until it reaches the horizontal and it is coplanar to the mirror of the water, leaving the passage to suspended solids and a small percentage of water.

Said collecting channel comprises a hole adapted to connect a discharge duct for the collected creams to a collector housing a submersible pump to pump the creams to another stage of the water system where the waste will be eliminated. solid waste collected. Said submersible pump is operated by a float switch

At least one support structure for the fixing of the bi-directional automatic skimmer for wastewater treatment tanks in a wall or structure of a wastewater treatment tank and for the regulation of its height depending on the quantity of creams generated in the wastewater. the tank and the height of the water mirror. Said at least one supporting structure, consists of a plate comprising on its external face a pair of threaded studs arranged vertically in which are screwed drive nuts comprising a fixed arm perpendicularly which passes through vertical slots to be fixed with fixation means in respective fixed brackets on the sides of each end of said collecting channel, so that the collecting channel is supported by the assembly of the arms of the fixed nuts in the brackets that connects with the collecting channel so that the turning of said nuts to raise or lower through the threaded studs allows to raise or lower said collector channel to regulate its height.

In the preferred embodiment of the invention are two support structures for fixing the bidirectional automatic skimmer for wastewater treatment tanks. Said plates comprise a perpendicular eyebrow at the upper end adapted to be fixed with fixing means in a wall, wall or structure of a wastewater treatment tank. This adjustment movement allows the operator to adjust the height in four points (two points for each wall support).

When a cream extraction cycle is started, the pneumatic actuator pushes the vertical lever of the longitudinal axis with cams and this in turn turns partially to the left or right tilting one of the longitudinal blades that rotates partially to the left or right on one of its vertices, which is articulated with said hermetic and flexible joint to the collector channel, until it reaches the horizontal and is coplanar to the mirror of the water leaving the passage to suspended solids and a small percentage of water. This action leaves the free passage to capture the solids suspended in the tank as well as a little water that accompanies the creams, once inside the collector channel it is directed by means of a discharge duct with means of connection and packaging to a collector located at one side of the collector channel, which is sent to another stage of the water system where the solids collected with the support of submersible pump that is inside the same collector will be eliminated. The submersible pump is activated by means of the float switch when detecting water level in the collector. Since the cream collection cycle was carried out, the respective longitudinal pallet returns to its rest position by opposite action of the pneumatic actuator, again preventing the passage of water and creams to the collector channel until more are accumulated. This same process is carried out on the opposite side where suspended solids can also be accumulated by actuating in the opposite direction the pneumatic actuator by rotating in the opposite direction to said longitudinal axis with cams and the corresponding longitudinal pallet. In order to better understand the characteristics of the invention, the present description is accompanied, as an integral part thereof, by the drawings, which are illustrative but not limitative, which are described below.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is an exploded bidi automatic recirculating skimmer for wastewater treatment tanks, in accordance with the present invention.

Figure 2 shows an exploding of the collecting channel integrating the longitudinal vanes, their flexible hermetic joints and the longitudinal axis with cams, in accordance with the preferred embodiment of the invention.

Figure 3 illustrates a cross section of the bidirectional automatic skimmer for wastewater treatment tanks, in the absence of the longitudinal axis, in the rest position, in accordance with the present invention.

Figure 4 illustrates a cross-section of the bidirectional automatic skimmer for wastewater treatment tanks, in the absence of the longitudinal axis, in the operating and operating position, in accordance with the present invention.

Figure 5 shows a top view of the automatic skimmer Bidirectional for wastewater treatment tanks, supported on a wall of a wastewater treatment tank. Figure 6 shows a conventional perspective view of the bidirectional automatic skimmer for wastewater treatment tanks, supported on a wall of a wastewater treatment tank, illustrating an amplified "A" detail.

For a better understanding of the invention, a detailed description will be made of some of the modalities thereof, shown in the drawings that are annexed to the present description for non-limiting illustrative purposes.

DETAILED DESCRIPTION OF THE INVENTION

The characteristic details of the bidirectional automatic skimmer for wastewater treatment tanks are clearly shown in the following description and in the accompanying illustrative drawings, the same reference signs serving to indicate the same parts.

With reference to figures 1 to 4, the bidirectional automatic skimmer (1) for wastewater treatment tanks, according to the present invention consists of an elongated collector channel (2) preferably substantially trapezoidal in shape, sealed at both ends by sealing plates (3, 4) and with a perpendicular fold in the upper area of each of the lateral walls defining a pair of upper eyebrows (5, 6) which in turn define a central upper mouth (7) open therethrough along the entire length of said collecting channel (2); wherein said upper eyebrows (5,6) are adapted to receive respective longitudinal vanes (8, 9) that extend the entire length of said collector channel (2) and are pivotally fixed by means of a hermetic and flexible joint (10, 11). ) on the inner edges of said upper eyebrows (5, 6); and wherein said longitudinal vanes (8, 9) obstruct the collector channel (2) preventing the passage of water in the standby mode.

Said longitudinal vanes (8, 9) are arranged at an angle of approximately 10 ° on the horizontal in the rest position. A longitudinal axis (12) is arranged in the upper central part of said collecting channel (2) supported at its ends in a pair of bearings (13, 14), one of them comprising two stop bolts (15) that limit the rotation of said longitudinal axis (12) and comprising respective diametrically opposed cams (16, 17) distributed along its entire length, adapted to support the internal edges (18, 19) of said longitudinal vanes (8, 9) which preferably they define a projected lower fold and establish a contact surface with said cams (16, 17) sealing the central mouth (7) of said collecting channel (2) in position in rest mode.

Said longitudinal axis (12) comprising at one of its ends a vertical lever (20) with an upper slot (21) where it is fixed the end of the shank (22) of a pneumatic actuator (23) that when operated to extend or retract rotates in one direction or another to said longitudinal axis (12) that by means of the respective cams (16, 17) partially rotates a longitudinal pallet path (8 or 9) through its hermetic and flexible articulation (10, 11) until it reaches the horizontal and is coplanar to the water mirror, leaving the passage to suspended solids and a small percentage of water inside said collector channel (2). Referring to Figures 1, 2, 5 and 6, said bidirectional automatic skimmer (1) for wastewater treatment tanks comprises a pair of support structures (24, 25) for attachment to a wall (26) or structure of a wastewater treatment tank (27) and for the regulation of its height depending on the amount of creams generated in the tank and the height of the water mirror. Said supporting structures (24, 25) consist of a plate (28, 29) comprising on its external face a pair of threaded studs (30, 31) arranged vertically in which drive nuts (32, 33) are screwed in which it comprises a perpendicular arm (34) which passes through vertical slots (35, 36) made in said plates (28, 29) to be fixed with fixing means (37) in respective brackets (38, 39) fixed in the sides of each end of said collector channel (2), so that the collector channel (2) is supported by the assembly of the perpendicular arms (34) of the drive nuts (32, 33) fixed in the brackets (38, 39) of the collector channel (2) so that the rotation of said drive nuts (32, 33) allows the collector channel (2) to be raised or lowered through the threaded studs (30, 31) allowing up or down said collector channel (2) to regulate its height,

Said plates (24, 25) comprises a perpendicular eyebrow (40) at the upper end adapted to be fixed with fixing means (41) on a wall (26) of a wastewater treatment tank (27). This adjustment movement allows the operator to adjust the height in four points (two points for each wall support). With reference to figures 1 and 3 to 6, said collector channel (2) comprises below a hole (42) adapted to connect with connection and packaging means (43) a discharge duct (44) of the captured crews that leads to a manifold (45) that houses a submersible pump (46) to pump the creams to another stage of the water system where the collected solid waste will be removed. Said submersible pump (46) is actuated by a float switch (not shown).

When a cream extraction cycle is started, the pneumatic actuator (23) pushes the vertical lever (20) of the longitudinal axis (12) with respective cams (16, 17) and this in turn turns partially to the left or right , tilting one of the longitudinal vanes (8, 9) that rotates partially to the left or right on one of its vertices, which is articulated with said hermetic and flexible joint (10, 11) to the collector channel (2), until reaching the horizontal and being coplanar to the water mirror leaving the passage to suspended solids and a small percentage of water (see figure 4). This action, leaves the free step to capture the solids suspended in the tank as well as a little water that accompanies the creams, once inside the collector channel (2) it is directed through the discharge duct (44) with connection and packing means (43) to the collector (45) located next to the collector channel (2), which is sent to another stage of the water system where the collected solids will be removed with the support of the submersible pump (46) that is inside the same collector (45). The submersible pump (46) is actuated by means of the float switch (not shown) to detect the water level in the collector (45).

Since the cream collection cycle was carried out, the respective longitudinal blade (8, 9) returns to its rest position by opposite action of the pneumatic actuator (23), again preventing the passage of water and cream to the collector channel (2) until they accumulate more (see figure 3). This same process is carried out on the opposite side where suspended solids can also be accumulated by actuating in the opposite direction the pneumatic actuator (23) rotating in the opposite direction to said longitudinal axis (12) with respective cams (16, 17) and the corresponding longitudinal pallet (8, 9).

The invention has been described sufficiently so that a person with average skill in the art can reproduce and obtain the results that we mentioned in the present invention. However, any person skilled in the art who is competent in the present invention may be able to make modifications not described in the present application, however, if for the application of these modifications in a structure determined or in the manufacturing process thereof, the subject matter claimed in the following claims is required, said structures shall be included within the scope of the invention.

Claims

CLAIMS Having sufficiently described the invention, the contents of the following claim clauses are claimed as property.

1.- A bidirectional automatic skimmer for wastewater treatment tanks, characterized in that it comprises a collector channel with sealing plates at both ends and the side walls comprising a pair of upper brows projected toward the central area defining a central mouth between them top open along the entire length of said collecting channel; wherein the internal edges of said upper eyebrows are adapted to receive respective longitudinal blades fixed pivotally by a hermetic and flexible joint, being disposed substantially inclined in rest position to prevent the passage of water into the collecting channel; a longitudinal axis supported at its ends in a pair of fixed journals in said sealing plates disposed along said open upper central mouth of said collecting channel and comprising diametrically opposed cams distributed along its entire length adapted to support the internal edges of said longitudinal vanes and keeping them with said inclination in rest position; wherein said longitudinal axis comprises at one of its ends a vertical lever where the end of a rod of a hydraulic or pneumatic actuator is fixed to rotate partially in one direction or another to said longitudinal axis, so that said cams on one side or another partially lower a longitudinal blade through its articulation hermetic and flexible until it reaches the horizontal and is coplanar to the mirror of the water leaving the way to suspended solids and a small percentage of water; Said collecting channel comprises below a discharge orifice of the collected cremes; and wherein said skimmer further comprises at least one support structure for fixing the bidirectional automatic skimmer for wastewater treatment tanks.

2. - The bidirectional automatic skimmer for wastewater treatment tanks, according to the claim

1, characterized in that said longitudinal vanes are fixed pivotally by means of a hermetic and flexible articulation, they are inclined at an angle of approximately 10 ° on the horizontal in rest position.

3. - The bi-directional automatic skimmer for wastewater treatment tanks, according to claim 1, characterized in that in said discharge orifice of the collector channel is connected a discharge duct of the collected nuggets that leads them towards a collector that houses a submersible pump to pump the cream into another stage of the water system where the collected solid waste will be eliminated.

4. - The bidirectional automatic skimmer for wastewater treatment tanks, according to the claim

1, characterized in that said at least one support structure consists of a plate comprising on its external face a pair of threaded studs arranged vertically in which screw drive nuts comprising a fixed arm perpendicularly passing through vertical slots of said plates to be fixed with fixing means in respective fixed brackets on the sides of at least one end of said collecting channel, so that the channel collector is supported by the assembly of the arms of the fixed nuts in the brackets that connects with the collector channel; the rotation of said nuts in one direction or another allows raising or lowering the collector channel through the threaded studs to adjust their height.

5. - The bidirectional automatic skimmer for wastewater treatment tanks, according to claim 4, characterized in that said plate of said at least one supporting structure comprises a perpendicular eyebrow at the upper end adapted to be fixed with fixing means in a wall, wall or structure of a wastewater treatment tank.

6. - The bidirectional automatic skimmer for wastewater treatment tanks, according to the previous claims, characterized in that said collector channel comprises two support structures, one at each end thereof.