GB2515494A - Water storage apparatus for storing water from a washing and/or material grading process - Google Patents

Water storage apparatus for storing water from a washing and/or material grading process Download PDF

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Publication number
GB2515494A
GB2515494A GB1311200.8A GB201311200A GB2515494A GB 2515494 A GB2515494 A GB 2515494A GB 201311200 A GB201311200 A GB 201311200A GB 2515494 A GB2515494 A GB 2515494A
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GB
United Kingdom
Prior art keywords
treatment section
region
water treatment
water
waste water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1311200.8A
Other versions
GB201311200D0 (en
Inventor
Darren Eastwood
Gregg Mckeown
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CDE Global Ltd
Original Assignee
CDE Global Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CDE Global Ltd filed Critical CDE Global Ltd
Priority to GB1311200.8A priority Critical patent/GB2515494A/en
Publication of GB201311200D0 publication Critical patent/GB201311200D0/en
Publication of GB2515494A publication Critical patent/GB2515494A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1468—Discharge mechanisms for the sediments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/32—Hydrocarbons, e.g. oil
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Filtration Of Liquid (AREA)

Abstract

A water storage apparatus for receiving waste water from a washing and/or material grading process comprises a first compartment 20 for storing water for reuse, a second compartment 22 for storing sludge for subsequent disposal, and a water treatment section 24. A waste water inlet region 28 is defined in an upper region of the water treatment section for receiving waste water, whilst a solids collection region 50 is provided adjacent the waste water inlet region. The solids collection region communicates with the second compartment, wherein the water treatment section is arranged such that waste water passes downwardly through the water treatment section from the waste water inlet region towards a water outlet region 30 communicating with the first compartment while solid contaminants are entrained from the waste water inlet region towards the solids collection region through the upper region of the water treatment section.

Description

Water Storage Apparatus for storing water from a Washing and/or Material Grading Process The present invention relates to a water storage apparatus for storing water from a washing and/or material grading process and in particular to a water storage apparatus incorporating water treatment means for removing solid contaminants from waste water prior to reuse.
Many industrial processes involve washing processes wherein fine solid contaminants, such as finely divided clay, grit and silt, are removed in the washing process and carried away in a flow of waste water. The waste water carries the impurities in suspension.
Waste water from such washing or grading processes is typically collected in a water storage tank for re-circulation around the system. Filtering or other separation processes may be used to remove fine solids from the waste water in the form of a sludge, such sludge being collected in a buffer tank for later disposal.
However, it is common for solid contaminants to pass into and build up in the water storage tank, leading to problems when the water contained therein is reused.
According to the present invention there is provided a water storage apparatus for receiving waste water from a washing and/or material grading process, said apparatus comprising a first compartment for storing water for reuse and a second compartment for storing sludge for subsequent disposal, and a water treatment section, a waste water inlet region being defined in an upper region of the water treatment section for receiving waste water, a solids outlet region being provided adjacent said waste water inlet region in or adjacent said upper region of the water treatment section, said solids collection region communicating with said second compartment, said water treatment section being arranged such that waste water passes downwardly through at least a first portion said water treatment section from said waste water inlet region towards a water outlet region communicating with said first compartment while solid contaminants are entrained from said waste water inlet region towards said solids collection region through said upper region of the water treatment section.
Preferably said water treatment section comprises a downwardly directed water flow path extending between the waste water inlet and water outlet regions of the water treatment section At least one gas outlet may be provided in a lower region of the water treatment section communicating with a source of pressurised gas for passing gas upwardly through the water treatment section to entrain solid contaminants towards the solids collection region. Alternatively, there may be sufficient air or gas entrained in the waste water entering the water treatment section to create an upward flow of gas upwardly through the water treatment section, thus obviating the need for gas outlets.
In one embodiment one or more baffles may be provided within said water treatment section to divide said water treatment section into said downwardly directed water flow path and a substantially horizontally extending solids flow path extending from said waste water inlet region to said solids collection region.
In one embodiment the apparatus may comprise a hollow tank having a bottom wall, opposed side walls, and opposed end walls, first and second intermediate walls extending between said opposed side walls to define end walls of said first and second compartments, , said water treatment section being located adjacent said second intermediate wall.
A third intermediate wall may be provided, extending between said opposed side walls of the tank to divide said water treatment section into a vertically arranged first passage adjacent said second compartment and a vertically arranged second passage, said third intermediate wall terminating at a location spaced from said bottom wall to enable waste water to flow between said first and second passages of the water treatment section, such that a waste water flow path is defined through said water treatment section downwardly through said first region from said waste water inlet region and upwardly through said second region.
The waste water inlet region and solids collection region may be located at an upper end of the first passage of the water treatment section, at least one gas outlet being located at a lower end of said first passage to pass gas upwardly through said first passage of the water treatment section towards the waste water inlet region.
Preferably the second passage of the water treatment section communicates with said first compartment of the tank.
The water treatment section may communicate with the first compartment via an opening may be provided in or adjacent an upper region of the first intermediate wall or an adjacent further wall to allow water to pass from the water treatment section into the first compartment of the tank.
A hydrocarbon filtration or separation device may be provided in said opening for removing hydrocarbons from water passing from the second region of the water treatment section into the first compartment.
In a preferred embodiment said waste water inlet region comprises an inlet trough extending between the opposed side walls of the tank on wall of the trough defining a weir over which waste water may flow to pass into the water treatment section.
A water inlet pipe may be mounted above the inlet trough for supplying waste water into the inlet trough.
The solids collection region may comprise a shelf extending to one side of the first passage opposite the waste water inlet region, one or more drain apertures being provided in the base of the shelf for passing solid material collected thereon into the second compartment. Preferably the shelf extends from an upper edge of the second intermediate wall into the second compartment.
The one or more drain apertures may be provided with a valve or closure member for selectively closing said one or more drain apertures. The or each valve or closure member may be opened periodically under the control of a timer to pass solid material collected in the solids collection region into the second compartment.
Embodiments in accordance with the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which Figure 1 is a perspective view of a water storage apparatus in accordance with an embodiment of the present invention; Figure 2 is a further perspective view of the apparatus of Figure 1; Figure 3 is a plan view of the apparatus of Figure 1; Figure 4 is a sectional view on line A-A of Figure 3; and Figure 5 is a longitudinal sectional view through a water storage apparatus in accordance with a further embodiment of the present invention A water storage apparatus in accordance with the present invention comprises a rectangular box-like hollow tank 2 having a bottom wall 4, and opposed side walls 6,8, opposed end walls 10,12. Preferably the tank 2 is dimensioned to correspond to the external dimensions of a standard shipping container.
Transversely extending first and second intermediate walls 16,18 extend between said side walls, defining respective inner end walls of a first compartment 20 at a first end of the tank 2, defining a water storage compartment, and a second compartment 22 at a second, opposite end of the tank 2, defining a sludge storage tank or buffer tank.
A water treatment section 24 is defined between the first and second compartments 20,22. A vertically arranged third intermediate wall 26 extends between the side walls 6,8 of the tank 2, between the first and second intermediate walls 16,18 (end walls of the first and second compartments), dividing the water treatment section 24 into an inlet region 28 and an outlet region 30. The third intermediate wall 26 terminates above the bottom wall 4 of the tank 2 to define a passageway 32 between the inlet and outlet regions 28,30 of the water treatment section 24 adjacent the bottom wall 4 of the tank 2.
A series of conduits 34,36,38 are mounted on the bottom wall 4 of the tank 2 at a lower end of the inlet region 28 of the water treatment section 24. The conduits 34,36,38 have a plurality of outlet apertures formed therein for releasing gas into the lower end of the inlet region 28, said conduits 34,36,38 being connectable to a source of pressurised gas (e.g. a pump) for passing a flow of air upwardly through the inlet region 28, as will be described below in more detail.
A waste water inlet pipe 40 is mounted above an inlet trough 42 provided in an upper region of the water treatment section 24, adjacent the inlet region 28, whereby waste water can be passed into the inlet trough 42, a side wall of the trough, defined by an upper section of the third intermediate wall 26, defining a weir 44 communicating with an upper region of the inlet region 28, whereby waste water passed into the inlet trough 42 will overflow over the weir 44 into the inlet region 28 of the water treatment section 24.
A solids collection region 50 is defined at an upper region of the inner end wall (second intermediate wall) 18 of the second compartment 22, to one side of the inlet region 28 of the water treatment section 24 opposite the inlet trough 42. The solids collection region 50 comprises a shelf extending into and over the second compartment 22, whereby solid material entrained to the surface of the waste water contained within the inlet region 28 by the air released from the air conduits 34,36,38 passes into said solids collection region 50. Drain apertures 52,54 are provided in the base of the solids collection region 50, valves 56,58 (for example gate valves) being provided in said drain apertures 52,54 operable to selectively and periodically open the apertures 52,54 to dump material collected within the solids collection region 50 into the second compartment 22. The operation of such valves 56,58 may be manually controlled or may be under the control of a timer or programmable controller.
An opening 60 is provided in an upper region of the inner end wall (first intermediate wall) 16 of the first compartment 20 for passing water into the first compartment 20 from the outlet region 30 of the water treatment section 24. grease hydrocarbon filter 62 may be mounted within or downstream of said opening 60 for removing hydrocarbons from the waste water before it is passed into the first compartment 20.
In use, waste water is passed into the inlet trough 42 via the waste water inlet pipe 40, said waste water being fed from a washing or grading process, or from any other source of contaminated waste water that may contain solid waste entrained therein.
The waste water overflows over the weir 44 defined by one side of the inlet trough 42 and into the inlet region 28 of the water treatment section 24. At the same time, gas is pumped out of the conduits 34,36,38 located in the bottom of the inlet region 28, creating a rising stream of gas bubbles within the inlet region 28 of the water treatment section. The waste water flows downwardly through the inlet region 28 of the water treatment section 24, under the third intermediate wall 26 and upwardly though the outlet region 30 of the water treatment section to pass through the opening 60 into the first compartment 20, preferably through the hydrocarbon filter 62.
The rising stream of bubbles within the inlet region 28 of the water treatment section 24 entrains any solid material contained within the waste water in an upwards direction, maintaining such solid material on the surface of the waste water within the water treatment section 24. This solid material is displaced sidewardly into the solids collection region 50. Periodically, for example under the control of a timer, the valves 56,58 are opened in the drain apertures 52,54 in the base of the solids collection region 50 to deliver the collected solid material into the second compartment 22 of the tank 2 for subsequent disposal. Where the waste water entering the water treatment section 24 is sufficiently aerated, for example due to turbulence, sufficient air may be entrained into the water treatment section 24 such that the addition of further gas may not be required. In such case, the conduits 34,36,38 may not be required.
The removal and collection of solid material from the waste water ensures that the waste water collected in the tirst compartment 20 of the tank 2 is relatively clean and prevents the build up of solid contaminants within the water storage tank defined by the first compartment 20. This water can then be reused without the risk of contamination or blockage of the system in which it is used.
In the embodiment shown in Figures 1 to 4 and described above, the water treatment section is located between the first and second compartments. In an alternative embodiment, illustrated in Figure 5, the water treatment section 124 may be located at one end of the tank 102, the second compartment 122, defining the sludge storage tank, being located adjacent the water treatment section 124 for receiving solid material therefrom while the first compartment 120, defining the water storage tank, is located at an opposite end of the tank from the water treatment section 124, the first and second compartments 120,122 and water treatment section 124 being separated from one another by first and second intermediate walls 116,118 extend between the side walls of the tank 102.
The water outlet 160 of the water treatment section 124 may communicate with the first compartment 120 via a passage 162 extending beneath or through a lower region of the second compartment 122. Such passage 162 may extend between the bottom wall of the tank and a bottom wall of the second compartment. One or more vertical baffles 164 may be provided in the first compartment 120 or in the passage communicating between the water treatment section 124 and the first compartment 120, to prevent the back flow of clean water from the first compartment 120 into the water treatment section. A hydrocarbon filter 166 may be provided at an upper end of said vertical baffle 164, through which filter 166 water must pass before entering the first compartment 120.
Baffles, for example horizontally extending baffle plates 126,128 as shown in Figure 5, may be located in the water treatment section for preventing solid material from being entrained from the water inlet trough 142 towards the water outlet 160 of the water treatment section 124, by defining a convoluted or indirect flow path between the water inlet and the water outlet of the water treatment section 124.
As with the first embodiment, one or more gas conduits 134,136,138 may be located in a lower region of the water treatment section 124, adjacent an inlet region of the water treatment section 124 for generating a rising stream of gas bubbles within the inlet region 130 of the water treatment section 124 for maintaining any solid material contained in the waste water entering the water treatment section 124 on the surface of the waste water within the water treatment section 124, whereby such solids material is entrained along an upper region of the water treatment section to pass through a solids outlet 150 into the second compartment 122.
The invention is not limited to the embodiment(s) described herein but can be amended or modified without departing from the scope of the present invention.

Claims (17)

  1. Claims 1. A water storage apparatus for receiving waste water from a washing and/or material grading process comprising a first compartment for storing water for reuse, a second compartment for storing sludge for subsequent disposal, and a water treatment section, a waste water inlet region being defined in an upper region of the water treatment section for receiving waste water, a solids collection region being provided adjacent said waste water inlet region in or adjacent said upper region of the water treatment section, said solids collection region communicating with said second compartment, said water treatment section being arranged such that waste water passes downwardly through the water treatment section from said waste water inlet region towards a water outlet region communicating with said first compartment while solid contaminants are entrained from said waste water inlet region towards said solids collection region through said upper region of the water treatment section.
  2. 2. An apparatus as claimed in claim 1, wherein at least one gas outlet is provided in a lower region of the water treatment section communicating with a source of pressurised gas for passing gas upwardly through the water treatment section to entrain said solid contaminants towards said solids collection region.
  3. 3. An apparatus as claimed in claim 1 or claim 2, wherein said water treatment section comprises a downwardly directed water flow path extending between the waste water inlet region and the water outlet region of the water treatment section.
  4. 4. An apparatus as claimed in claim 3, wherein one or more baffles are provided within said water treatment section to divide said water treatment section into said downwardly directed water flow path and a substantially horizontally extending solids flow path extending from said waste water inlet region to said solids collection region.
  5. 5. An apparatus as claimed in any preceding claim, comprising a hollow tank having a bottom wall, opposed side walls, and opposed end walls, first and second intermediate walls extending between said opposed side walls to define end walls of said first and second compartments, said water treatment section being located adjacent said second intermediate wall.
  6. 6. An apparatus as claimed in claim 5, wherein a third intermediate wall extends between said opposed side walls of the tank to divide said water treatment section into a vertically arranged first passage and a vertically arranged second passage, said third intermediate wall terminating at a location spaced from said bottom wall to enable waste water to flow between said first and second passages of the water treatment section, such that a waste water flow path is defined through said water treatment section downwardly through said first region from said waste water inlet region and upwardly through said second region.
  7. 7. An apparatus as claimed in claim 6, wherein said waste water inlet region and solids collection region are located at an upper end of the first passage of the water treatment section, at least one gas outlet being located at a lower end of said first passage to pass gas upwardly through said first passage of the water treatment section towards the waste water inlet region.
  8. 8. An apparatus as claimed in claim 7, wherein said second passage of the water treatment section communicates with said first compartment of the tank.
  9. 9. An apparatus as claimed in any of claims 5 to 8, , wherein the water treatment section communicates with the first compartment via an opening is provided in or adjacent an upper region of the first intermediate wall or an adjacent further wall to allow water to pass into the water treatment section into the first compartment of the tank.
  10. 10. An apparatus as claimed in claim 9, wherein a hydrocarbon filtration device is provided in said opening for removing hydrocarbons, such as oil, from water passing from the water treatment section into the first compartment.
  11. 11. An apparatus as claimed in any preceding claim, wherein said waste water inlet region comprises an inlet trough extending between the opposed side walls of the tank, a side wall of said trough defining a weir over which waste water may flow to pass into the water treatment section.
  12. 12. An apparatus as claimed in claim 11, wherein a water inlet pipe is mounted above the inlet trough for supplying waste water into the inlet trough.
  13. 13. An apparatus as claimed in any preceding claim, wherein said solids collection region comprises a shelf extending to one side of the water treatment section, opposite the waste water inlet region, one or more drain apertures being provided in the base of the shelf for passing solid material collected thereon into the second compartment.
  14. 14. An apparatus as claimed in claim 13, wherein said shelf extends from an upper edge of the second intermediate wall into the second compartment.
  15. 15. An apparatus as claimed in claim 13 or claim 14, wherein said one or more drain apertures are provided with a valve or closure member for selectively closing said one or more drain apertures.
  16. 16. An apparatus as claimed in claim 15, wherein the or each valve or closure member is opened periodically under the control of a timer to pass solid material collected in the solids collection region into the second compartment.
  17. 17. A water storage apparatus for an aggregate washing and/or grading facility substantially as described herein with reference to the accompanying drawings.
GB1311200.8A 2013-06-24 2013-06-24 Water storage apparatus for storing water from a washing and/or material grading process Withdrawn GB2515494A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1311200.8A GB2515494A (en) 2013-06-24 2013-06-24 Water storage apparatus for storing water from a washing and/or material grading process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1311200.8A GB2515494A (en) 2013-06-24 2013-06-24 Water storage apparatus for storing water from a washing and/or material grading process

Publications (2)

Publication Number Publication Date
GB201311200D0 GB201311200D0 (en) 2013-08-14
GB2515494A true GB2515494A (en) 2014-12-31

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GB1311200.8A Withdrawn GB2515494A (en) 2013-06-24 2013-06-24 Water storage apparatus for storing water from a washing and/or material grading process

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156648A (en) * 1978-05-30 1979-05-29 The United States Of America As Represented By The Secretary Of The Navy Flotation device with pretreatment
US5766484A (en) * 1996-06-03 1998-06-16 Envirex Inc. Dissolved gas floatation device
US20090211974A1 (en) * 2005-09-09 2009-08-27 Degremont Water clarifying apparatus and implementing method
US20110114565A1 (en) * 2009-11-16 2011-05-19 Roberts R Lee Dissolved air flotation clarifier
WO2012153245A1 (en) * 2011-05-12 2012-11-15 Degremont Rapid flotation device for water laden with suspended matter, and method for implementing same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156648A (en) * 1978-05-30 1979-05-29 The United States Of America As Represented By The Secretary Of The Navy Flotation device with pretreatment
US5766484A (en) * 1996-06-03 1998-06-16 Envirex Inc. Dissolved gas floatation device
US20090211974A1 (en) * 2005-09-09 2009-08-27 Degremont Water clarifying apparatus and implementing method
US20110114565A1 (en) * 2009-11-16 2011-05-19 Roberts R Lee Dissolved air flotation clarifier
WO2012153245A1 (en) * 2011-05-12 2012-11-15 Degremont Rapid flotation device for water laden with suspended matter, and method for implementing same

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