GB2148399A - Compression of air for use in water treatment plant - Google Patents

Compression of air for use in water treatment plant Download PDF

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Publication number
GB2148399A
GB2148399A GB08326732A GB8326732A GB2148399A GB 2148399 A GB2148399 A GB 2148399A GB 08326732 A GB08326732 A GB 08326732A GB 8326732 A GB8326732 A GB 8326732A GB 2148399 A GB2148399 A GB 2148399A
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United Kingdom
Prior art keywords
air
water
valve means
measuring vessel
water treatment
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.)
Granted
Application number
GB08326732A
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GB8326732D0 (en
GB2148399B (en
Inventor
David George Stevenson
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.)
Paterson Candy International Ltd
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Paterson Candy International 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 Paterson Candy International Ltd filed Critical Paterson Candy International Ltd
Priority to GB08326732A priority Critical patent/GB2148399B/en
Publication of GB8326732D0 publication Critical patent/GB8326732D0/en
Publication of GB2148399A publication Critical patent/GB2148399A/en
Application granted granted Critical
Publication of GB2148399B publication Critical patent/GB2148399B/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1289—Aeration by saturation under super-atmospheric pressure
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Physical Water Treatments (AREA)

Abstract

Air is compressed in a positive manner using the high pressure water to be treated as the energy source. A measuring vessel (1) is first allowed to drain down under atmospheric or reduced pressure to waste (3) via a valve (2). High pressure water from a pump (7) is then admitted through a valve (6) and the air compressed and subsequently forced forward through a valve (8) to the point of use, which may be, for example, the absorber (10) of a dissolved air flotation plant. The cyclic draining and repressurisation may instead be controlled by a three-way valve. Whichever valve arrangement is adopted it can be operated automatically by a timer, or by level probes in the measuring vessel. <IMAGE>

Description

SPECIFICATION Compression of air for use in water treatment plant This invention relates to a method of and apparatus for compressing air for use in water treatment plant and to a water treatment plant as such.
For the separation of solids by dissolved air flotation for example, air must be dissolved in water at pressures above atmospheric pressure. Normally both the water and the air are brought up to the desired pressure before being fed into an absorber or some equivalent device. Likewise for the removal of iron and manganese from ground waters it is frequently necessary to inject air into the water stream under pressure, particularly if pressure filters are to be used subsequently for removing the oxidised iron and manganese. Most commonly a conventional air compressor is used for such purposes but they are relatively expensive particularly compared with pumps used for pressurising water. Maintenance of air compressors is also more costly than with the average centrifugal pump.
In some cases the air at atmospheric pressure is induced into an inductor but this involves a very considerable increase in the motive water pressure and hence the power consumption. Another method is to induce the air into the suction of a suitable pump but again the power consumption increases dramatically and it is not possible to achieve a wide range of air water ratios without encountering pump surging and possible loss of prime.
In one aspect, the invention provides a method of compressing air for use in water treatment plant, wherein the air is compressed using high pressure water as the energy source.
Preferably, a measuring vessel is drained down under atmospheric or reduced pressure, high pressure water is then admitted to compress this air and subsequently the air is forced forward to the point of use by the high pressure water.
Advantageously, the aforesaid high pressure water is drawn from the water to be treated.
The cyclic draining and repressurisation may be controlled by a three way valve or pair of valves operated automatically by a timer, or by level probes in the measuring vessel or other convenient means.
In a second aspect, the invention provides apparatus for compressing air for use in water treatment plant, comprising a measuring vessel, first valve means for admitting air into the measuring vessel, second valve means for admitting water under pressure into the vessel to compress the air therein, and third valve means for discharging the compressed air from the measuring vessel under the pressure of the water.
In a third aspect, the invention provides water treatment plant, comprising a source of water to be treated, a pump for supplying the water to a water treatment apparatus, a measuring vessel, first valve means for admitting air into the measuring vessel, second valve means for admitting water from the downstream side of the pump into the measuring vessel to compress the air therein, and third valve means for discharging the compressed air from the measuring vessel to the water treatment apparatus under the pressure of water.
The invention will now be more particularly described with reference to the accompanying drawing which is a schematic view of one embodiment of air compression apparatus according to the present invention.
Consider a dissolved air flotation plant in which the air demand is 10 m3/hr. It mightbe desired that a valve cycle time of 5 minutes would be reasonable hence the volume of a measuring vessel would be 0.83 m3. The measuring vessel 1, starting from the full condition, is allowed to drain down via a valve 2 to waste 3 or to a re-cycle pump suction pipe 4. Air is admitted via a non-return valve 5. After the requisite volume has been admitted valve 2 is closed and valve 6 is opened, thereby admitting high pressure water from a re-cycle pump 7. The non return valve 5 closes and air is compressed to the system pressure, after which it is forced forward through a non-return valve 8 to mix with the main re-cycle flow in pipe 9. A dwell period ensures that all the air is displaced forward and that the cycle starts from a repeatable datum point.In the case of flotation air is dissolved in an absorber vessel 10.
The valves 2 and 6 may be operated electrically, hydraulically via pilot valves, using the high pressure water as the motive fluid or pneumatically using high pressure air generated within the plant. The necessary air supply would be derived from a small separator vessel installed between the measuring vessel 1 and the nonreturn valve 8.
For some applications two measuring vessels may be preferable, operating in a double acting mode to produce a more continuous air supply.
Conventional air compressors suitable for this duty normally operate on an on/off basis and compress to a higher pressure than the water side to facilitate control. The overall power efficiency is low. Using the re-cycle water for compression exploits the high power efficiency and steady load conditions of the re-cycle pump, thereby reducing the running cost.
The invention is equally applicable to aeration for the removal of iron and manganese or for the adjustment of dissolved oxygen, but in the absence of a local pump a volume of water equal to the volume of air at atmospheric pressure must be discarded.

Claims (13)

1. A method of compressing air for use in water treatment plant, wherein the air is compressed using high pressure water as the energy source.
2. The method of claim 1, wherein a measuring vessel is drained down under atmospheric or reduced pressure, high pressure water is then admitted to compress the air and subsequently the air is forced forward to the point of use by the high pressure water.
3. The method of claim 1 or claim 2, wherein the aforesaid high pressure water is drawn from the water to be treated.
4. Apparatus for compressing air for use in water treatment plant, comprising a measuring vessel, first valve means for admitting air into the measuring vessel, second valve means for admitting water under pressure into the vessel to compress the air therein, and third valve means for discharging the compressed air from the measuring vessel under pressure of the water.
5. The apparatus of claim 4, further comprising fourth valve means for draining down the measuring vessel.
6. The apparatus of claim 3 or claim 4, further comprising control means for operating the valve means in an appropriate sequence.
7. The apparatus of claim 5 or claim 6, wherein the second and fourth valve means are operated hydraulically using the high pressure water within the apparatus.
8. The apparatus of claim 5 or claim 6, wherein the second and fourth valve means are operated pneumatically using air compressed within the apparatus.
9. Water treatment plant, comprising a source of water to be treated, a pump for supplying the water to a water treatment apparatus, a measuring vessel, first valve means for admitting air into the measuring vessel, second valve means for admitting water from the downstream side of the pump into the measuring vessel to compress the air therein, and third valve means for discharging the compressed air from the measuring vessel to the water treatment apparatus under the pressure of the water.
10. Water treatment plant as claimed in claim 7, further comprising fourth valve means for draining down the measuring vessel.
11. Water treatment plant as claimed in claim 7 or claim 8, further comprising control means for operating the valve means in an appropriate sequence.
12. The plant of claim 10 or claim 11, wherein the second and fourth valve means are operated hydraulically using the high pressure water within the plant.
13. Water treatment plant substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
13. The plant of claim 10 or claim 11, wherein the second and fourth valve means are operated pneumatically using air compressed within the plant.
14. A method of compressing air for use in water treatment plant, substantially as hereinbefore described with reference to the accompanying drawing.
15. Apparatus for compressing air for use in water treatment plant, substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
16. Water treatment plant substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
1. A method of compressing air for use in water treatment plant, comprising the steps of: (a) draining down a measuring vessel under atmospheric or reduced pressure, then (b) admitting into the measuring vessel high pressure water to compress the air to the same pressure as the high pressure water supply, and then (c) forcing all of the air out of the measuring vessel and forward to the point of use, by the high pressure water.
2. The method of claim 1, wherein the high pressure water is drawn from water with which air is to be mixed.
3. Apparatus for compressing air for use in water treatment plant, comprising a measuring vessel, first valve means for draining down the measuring vessel under atmospheric or reduced pressure second valve means for admitting air into the measuring vessel, third valve means for admitting high pressure water into the vessel to compress the air therein to the same pressure as the high pressure water supply, and fourth valve means for discharging all of the compressed air from the measuring vessel and forward to the point of use, under pressure of the water.
4. The apparatus of claim 3, further comprising control means for operating the valve means in an appropriate sequence.
5. The apparatus of claim 3 or claim 4, wherein the second and fourth valve means are operated hydraulically using the high pressure water within the apparatus.
6. The apparatus of claim 3 or claim 4, wherein the second and fourth valve means are operated pneumatically using air compressed within the apparatus.
7. Water treatment plant, comprising a source of water to be treated, a pump for supplying the water to a water treatment apparatus, a measuring vessel, first valve means for draining down the measuring vessel under atmospheric or reduced pressure, second valve means for admitting air into the measuring vessel, third valve means for admitting water from the downstream side of the pump into the measuring vessel to compress the air therein, and fourth valve means for discharging all of the compressed air from the measuring vessel and forward to the water treatment apparatus under the pressure of the water.
8. Water treatment plant as claimed in claim 7, further comprising control means for operating the valve means in an appropriate sequence.
9. The plant of claim 7 or claim 8, wherein the second and fourth valve means are operated hydraulically using the high pressure water within the plant.
10. The plant of claim 7 or claim 8, wherein the second and fourth valve means are operated pneumatically using air compressed within the plant.
11. A method of compressing air for use in water treatment plant, substantially as hereinbefore described with reference to the accompanying drawing.
12. Apparatus for compressing air for use in water treatment plant, substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
GB08326732A 1983-10-06 1983-10-06 Compression of air for use in water treatment plant Expired GB2148399B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08326732A GB2148399B (en) 1983-10-06 1983-10-06 Compression of air for use in water treatment plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08326732A GB2148399B (en) 1983-10-06 1983-10-06 Compression of air for use in water treatment plant

Publications (3)

Publication Number Publication Date
GB8326732D0 GB8326732D0 (en) 1983-11-09
GB2148399A true GB2148399A (en) 1985-05-30
GB2148399B GB2148399B (en) 1987-07-29

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Family Applications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5616007A (en) * 1994-12-21 1997-04-01 Cohen; Eric L. Liquid spray compressor

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB253597A (en) * 1925-03-18 1926-06-18 George Andrew Marshall An apparatus for provide a compressed air and water scour for such processes requiring a compressed air and water scour or to provide compressed air for any other purpose
GB317329A (en) * 1928-08-13 1930-10-30 Aubrey Carlyle Jamieson Improvements in and connected with hydraulically operated air compressors
GB416773A (en) * 1933-06-15 1934-09-20 Octave Fonson Improvements in hydro-pneumatic pumps
GB483510A (en) * 1936-11-09 1938-04-21 Leonard Andrews Improvements in and relating to settling tanks
GB493113A (en) * 1936-03-31 1938-09-30 Stephane Weber Improvements in and relating to hydraulic apparatus for compressing air
GB534093A (en) * 1939-11-04 1941-02-27 Gaskell & Chambers Ltd Improvements in water-operated air compressors
GB627754A (en) * 1946-02-23 1949-08-16 Giovanni Battista Buffa A device functioning as a compressor of air or other gas, or as a vacuum pump, by means of a liquid piston
GB649585A (en) * 1944-11-13 1951-01-31 Edvin Sjoberg Improvements in or relating to air compressors
GB678935A (en) * 1949-09-06 1952-09-10 William John Dennis Improvements in aerators
GB1499920A (en) * 1974-12-28 1978-02-01 Tatamoto J Hydroponic cultivation

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB253597A (en) * 1925-03-18 1926-06-18 George Andrew Marshall An apparatus for provide a compressed air and water scour for such processes requiring a compressed air and water scour or to provide compressed air for any other purpose
GB317329A (en) * 1928-08-13 1930-10-30 Aubrey Carlyle Jamieson Improvements in and connected with hydraulically operated air compressors
GB416773A (en) * 1933-06-15 1934-09-20 Octave Fonson Improvements in hydro-pneumatic pumps
GB493113A (en) * 1936-03-31 1938-09-30 Stephane Weber Improvements in and relating to hydraulic apparatus for compressing air
GB483510A (en) * 1936-11-09 1938-04-21 Leonard Andrews Improvements in and relating to settling tanks
GB534093A (en) * 1939-11-04 1941-02-27 Gaskell & Chambers Ltd Improvements in water-operated air compressors
GB649585A (en) * 1944-11-13 1951-01-31 Edvin Sjoberg Improvements in or relating to air compressors
GB627754A (en) * 1946-02-23 1949-08-16 Giovanni Battista Buffa A device functioning as a compressor of air or other gas, or as a vacuum pump, by means of a liquid piston
GB678935A (en) * 1949-09-06 1952-09-10 William John Dennis Improvements in aerators
GB1499920A (en) * 1974-12-28 1978-02-01 Tatamoto J Hydroponic cultivation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5616007A (en) * 1994-12-21 1997-04-01 Cohen; Eric L. Liquid spray compressor
WO1997026458A1 (en) * 1996-01-17 1997-07-24 Cohen Eric L Liquid spray compressor

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Publication number Publication date
GB8326732D0 (en) 1983-11-09
GB2148399B (en) 1987-07-29

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PCNP Patent ceased through non-payment of renewal fee