WO1995011201A1 - Installation de traitement des eaux usees et procede utilise dans cette installation - Google Patents

Installation de traitement des eaux usees et procede utilise dans cette installation Download PDF

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Publication number
WO1995011201A1
WO1995011201A1 PCT/GB1994/002309 GB9402309W WO9511201A1 WO 1995011201 A1 WO1995011201 A1 WO 1995011201A1 GB 9402309 W GB9402309 W GB 9402309W WO 9511201 A1 WO9511201 A1 WO 9511201A1
Authority
WO
WIPO (PCT)
Prior art keywords
separation tank
reaction tank
tank
treatment plant
pump
Prior art date
Application number
PCT/GB1994/002309
Other languages
English (en)
Inventor
Paul Jonathan Sallis
Sven Gunter Awege
Adam Geoffrey Reid
Original Assignee
Viridian Bioprocessing 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 Viridian Bioprocessing Ltd. filed Critical Viridian Bioprocessing Ltd.
Priority to GB9608212A priority Critical patent/GB2297500B/en
Priority to AU79449/94A priority patent/AU7944994A/en
Publication of WO1995011201A1 publication Critical patent/WO1995011201A1/fr

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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
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C02F3/343—Biological treatment of water, waste water, or sewage characterised by the microorganisms used for digestion of grease, fat, oil
    • 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

Definitions

  • the present invention relates to a waste water treatment plant in which contaminated water enters a chamber to which an outlet is connected below the level of water maintained in the chamber so as to retain floating contamination in the chamber.
  • FIG. 1 An example of a commonly available device which operates on this principle is shown in Figure 1.
  • These devices are commonly referred to in the art as API separators, fat traps or grease interceptors. Regulations in certain countries now stipulate that such a separator must be incorporated into the drainage system associated with establishments such as restaurants which use large amounts of fat and grease.
  • the fat or grease which will be hereinafter referred to as contaminants 4 , are buoyant and therefore collect in the upper region of the separator 2 leaving water 6 which is substantially free from buoyant contaminants to flow from the outlet 8.
  • the object of the invention is to provide a treatment plant which overcomes this disadvantage.
  • a water treatment plant comprising a separation tank with a contaminated water inlet and a discharge means connected such that buoyant contaminants are retained in the separation tank, the plant being characterised by a reaction tank in which degradation of the buoyant contaminants can occur and contaminant transfer means capable of transferring buoyant contaminants from the separation tank into the reaction tank.
  • a particularly convenient way of discharging water from the separation tank is by means of an overflow outlet.
  • the contaminant transfer means may effect the transfer periodically or on a continuous basis.
  • Such a treatment plant will obviate the necessity of removing buoyant contaminants such as fat and grease from the treatment plant and provide means by which the contaminants can be broken down.
  • a reaction tank which is separate from the separation tank, microbes present in the reaction tank for degradation purposes need not be exposed to the main through flow of contaminated water which passes through the separation tank. This through flow is likely to contain chemicals such as detergents and bleach which could kill the microbes and thus prevent the desired degradation occurring.
  • the separation tank preferably includes a flushing means including a clean water inlet which can be used to supply substantially uncontaminated water to flush out the contents of the separation tank, except the buoyant contaminants, prior to transferring the buoyant contaminants into the reaction tank. This will substantially reduce or avoid exposing microbes in the reaction tank to chemicals which may damage them.
  • Suitable microbes for effecting the degradation in the reaction tank include bacteria, fungi and protozoa.
  • the plant preferably includes nutrient supply means which can supply nutrients such as nitrates, phosphates and sulphates to the reaction tank. Maintaining reproduction of the microbes is of particular importance where operation of the plant involves a periodic loss of microbes.
  • temperature control means are preferably provided to maintain the temperature of the reaction tank at between 15°C and 40°C. Where degradation is by means of thermophilic microbes the temperature control means preferably maintains the temperature of the reaction tank at above 50°C.
  • the degradation may alternatively be by means of psychrophilic microbes which function in an optimum manner at between 0°C and 15°C.
  • the temperature control means is capable of being set for mesophilic psychrophilic or thermophilic microbes.
  • the plant preferably includes means to control the acidity in the reaction tank.
  • the acidity will be controlled to be between pH6 and pH9, preferably 7pH and 8pH.
  • the acidity control means preferably maintains the acidity at less than pH5.
  • the acidity control may be affected by the composition of additives supplied to the reaction tank.
  • the separation tank has an outlet from its lower region connected to the overflow outlet, the level of which maintains the normal level of water and contaminants in the separation tank.
  • the reaction tank is separated from the separation tank by dividing means such as a partition through or over which contaminants and also possibly water may flow into the reaction tank when the level of water and contaminants in the separation tank reaches a predetermined point above its normal level.
  • dividing means such as a partition through or over which contaminants and also possibly water may flow into the reaction tank when the level of water and contaminants in the separation tank reaches a predetermined point above its normal level.
  • transfer to the reaction tank may be achieved simply by preventing flow from the separation tank to the overflow outlet, then pumping water from the reaction tank to the separation tank.
  • the level in the separation tank may alternatively be raised for transfer purposes by supplying substantially uncontaminated water directly into the separation tank from a flushing cistern or any other suitable means.
  • the transfer of contaminants to the reaction tank may alternatively be provided by means of a conventional skimmer using an adsorbent and/or absorbent rotating disc or belt.
  • the means for preventing flow from the separation tank to the overflow outlet may be a mechanically actuated valve such as a solenoid valve.
  • a flap valve normally biassed towards an open position but which can be urged towards a closed position by flow from a low power pump however provides a flow prevention means with a lower initial capital cost. Flow from the low power pump can be directed towards part of a valve closure member so as to cause it to pivot towards a closed position.
  • This means of actuating a flap valve may constitute a separate invention independently of the other features discussed. So as to reduce the number of moving parts situated in the aggressive environment of the separation tank the valve may alternatively be one which is biased towards an open position, for example by buoyancy, and urgable to a closed position by a selectively applied weight.
  • a pump is preferably arranged to pump fluid from a lower region of the separation tank and discharge it from the plant. Transfer to the reaction tank may then conveniently be provided by means of a contaminant delivery pump adapted to pump buoyant contaminants which have overflowed into a low level trough to the reaction tank.
  • This arrangement has the advantage that no valve needs to be provided to prevent overflowing from the separation tank outlet occurring when transfer of buoyant contaminants is required and the tanks may be remote from each other or located one above the other rather than side by side.
  • the reaction tank preferably includes agitation and/or aeration means. Both the dispersion of contaminants such as fats and grease into the water and the incorporation of extra oxygen into water will increase the rate of degradation. Agitation and aeration may conveniently be provided by a pump connected to circulate water in the reaction tank over one or more weir structures. However, the fat and grease will tend to clog pumps and pipes through which they pass .
  • the reaction tank is therefore preferably provided with buoyant scouring beads adapted to scour out any pumps or pipes through which they pass.
  • the beads are preferably made of a plastics material such as polyethylene having a relative density of below 0.98 and more preferably below 0.96.
  • the beads preferably have an average diameter in the range 1 to 10 mm and more preferably in the range 2 to 4 mm. The use of beads for scouring in a waste water treatment plant may constitute a separate invention independently of the other features discussed.
  • each cycle of the plant preferably involves the disposal of between 2% and 50% and more preferably between 20% and 30% of fluid contained in the reaction tank. When the plant has a 24 hour cycle, preferably between 10% and 50% of the fluid contained in the reaction tank is disposed of.
  • the plant includes fluid level sensing means positioned to detect when fluid in the separation tank is at or near the point of overflowing from the outlet. Output from such a sensing means can advantageously be used in the control of the plant so as to prevent inadvertent loss of microbes from the separation tank via the overflow outlet. This could occur if the means for preventing flow from the separation tank to its discharge means was not functioning correctly.
  • sensing means are preferably provided for sensing when fluid in the plant as a whole is above a predetermined level.
  • the output of such a sensing means can be used to shut down operation of the plant in the event of the fluid level rising above the predetermined level.
  • Automatic control means are preferably provided to control the operation of the plant.
  • the provision of such control means will obviate the necessity for regular operator intervention. Only periodic checks that the plant is functioning correctly will be required.
  • the method preferably includes the additional step, prior to step b of flushing the separation tank out with substantially uncontaminated water.
  • step b includes actuation of a low power pump, flow from which urges a flap valve to a closed position so preventing flow from the separation tank to the outlet.
  • a particularly simple manner of effecting step b is to pump water from the reaction tank into the separation tank so as to cause the level in the separation tank to rise sufficiently that buoyant contaminants pass over a weir and then into the reaction tank. This pumping may be continued so as to thoroughly mix the contents of the tanks . Water to raise the level in the separation tank may however be provided in some other manner.
  • step c preferably includes agitation and/or aeration of contaminated water in the reaction tank.
  • step c preferably also includes controlling the acidity and/or temperature of the water in the reaction tank and adding nutrients to the reaction tank.
  • Figure 1 a vertical cross section through a typical prior art separation tank
  • Figure 2 a schematic horizontal cross section through a waste water treatment plant constructed according to the invention
  • Figure 3 a schematic vertical cross section through the plant shown in Figure 2 with the plant in a trap/digestion mode
  • Figure 4 a partial cross-section on the line A-A of the plant shown in Figure 2 in the trap/digestion mode
  • Figure 5 a similar view to Figure 3 with the plant in the transfer mode
  • Figure 6 a partial cross-section on the line A-A of the plant shown in Figure 2 in the transfer mode
  • FIGS 7-11 are schematic representations of the plant shown in Figures 2-6 showing different stages of the operational cycle of the plant
  • Figure 12 a view similar to Figure 3 of a second embodiment of the invention.
  • Figure 13 a view similar to Figure 3 of a third embodiment of the invention.
  • the plant 10a shown in Figures 2 to 6 includes a separation tank 12 which is divided from a reaction tank 14 by a dividing wall 16.
  • a duct 18 is connected to an inner wall of the separation tank 12 an upper end of which duct communicates with an overflow outlet 20 and the lower end of which has an outlet aperture 22.
  • a flap valve 24 is mounted to rotate about pivot axis 26 to close the outlet aperture 22.
  • the valve 24 is shown in an open position in Figure 3, and a closed position in Figure 5.
  • a lower end 25 of the flap valve is located adjacent an outlet from a low power centrifugal flap valve actuating pump 28.
  • the pump 28 may alternatively be a submersible close coupled pump. Flow from the pump 28 may be directed towards an upper region of the valve 24.
  • the dividing wall 16 has an upper edge 34 positioned above the upper edge of the outlet 20.
  • a contaminated water inlet pipe 36 leads into the separation tank from its side as shown in Figure 2 (shown entering from above in schematic view in Figs 3 and 5 ) .
  • the inlet pipe 36 is provided with a diffuser 37 so as to reduce the disturbance caused by water entering the separation tank.
  • a clean water inlet pipe 40 leads into the separation tank from above or from the side. Inflow of clean water is controlled by a first clean water inlet valve 38.
  • a trough 35 is provided, as shown in Figures 2 and 4.
  • One edge 39 of the trough 35 is vertically positioned so that when the plant is in the trap/digestion mode ( Figures 3 and 4) buoyant contaminants 78 are prevented from entering the trough.
  • the edge 39 of the trough will act as a weir and buoyant contaminants will enter the trough and subsequently flow over a cut-out section 17 in the dividing wall 16 and into the reaction tank 14.
  • a centrifugal transfer pump 42 is located in the reaction tank.
  • An outlet pipe 48 from the transfer pump extends up the dividing wall 16 and curves over the top of the dividing wall so that the transfer pump discharges into the separation tank 12.
  • a slanting plate 33 positioned below the outlet pipe 48 acts to deflect any flow from that pipe across the surface of the separation tank in the direction of arrow B (see Fig. 1) towards the trough. This plate 33 also reduces the tendency of flow from the outlet pipe 48 mixing buoyant contaminants 78 with water.80 in the separation tank.
  • the reaction tank 14 contains a mixing tank 50 in which a centrifugal mixing pump 52 is located, the outlet pipe 58 of which leads out of a lower region of the mixing tank 50.
  • a nutrient inlet pipe 60 and a second fresh water inlet pipe 62 flows through which are controlled by nutrient inlet valve 64 and a second clean water inlet valve 66 respectively lead to an upper region of the reaction tank 14.
  • These inlet pipes preferably lead into sides of the tank rather than through its upper surface as shown schematically in the drawings .
  • Flow of liquid nutrient into the reaction tank may alternatively be controlled by a peristaltic pump and a separate screw feed for particulate nutrient may also be provided.
  • An air inlet pipe 84 and an air outlet pipe 86 are provided to facilitate a through flow of air in the plant when it is operating.
  • Fluid level sensors SI,, S2 and S3 are provided in the mixing tank 50 and a further fluid level sensor 70 is provided at a high level in the plant.
  • the pump motors 28, 42 and 52, the inlet valves 38, 64 and 66 and the level sensors SI, S2, S3 and 70 are all connected by a wiring circuit 74 to a process controller 76.
  • a debris collector 77 projects into the reaction tank in order to collect fabric, string, sheet or any other similar material which enters this tank. The collector 77 can be pulled up periodically so that the debris can be removed.
  • the plant is then ready for receipt of water contaminated with fat and grease which enters the separation tank 12 via the inlet pipe 36.
  • the first flap valve 24 is biassed by some means, not shown, into the open position as shown in Figure 3, water will flow from the lower region of the separation tank 12 up the duct 18 and out of the outlet 20.
  • the level of water and buoyant contaminants in the separation chamber will accordingly be governed by the level of the outlet 20. This level is selected to be below the upper edge 39 of the trough 35, so that buoyant contaminants 78 entering the separation tank 12 will float on the surface of water 80 in the separation tank and will be retained therein. Excess water entering the separation tank will overflow from the outlet 20. This is referred to as the trap/digestion mode and is illustrated schematically in Figure 7.
  • the transfer mode begins, which lasts for approximately 1 hour (i.e. until 4 am) .
  • the mixing pump 52 is stopped thus allowing the level of fluid throughout the reaction tank to stabilise at level b, shown in Figure 8.
  • the transfer pump 42 is then started so as to pump out the required daily loss of fluid into the separation tank (approximately 25% of fluid in the reaction tank). This continues until the fluid in the reaction tank falls to level c, shown in Figure 9, at which point sensor SI is activated and the transfer pump 42 is stopped.
  • the first water inlet valve 38 will be opened, allowing clean water to enter the separation tank.
  • the buoyant contaminants 78 will remain on the surface and water 80 containing chemicals such as detergents and bleach will be flushed out of the separation tank.
  • the flap valve actuating pump 28 When this flushing process has been completed, after approximately 10 minutes, the flap valve actuating pump 28 is started. Flow of water from this pump 28 flows along its outlet pipe 82 (see Figures 5 and 10) and is directed towards a lower region 25 of the flap valve member 24. This will overcome the opening bias applied to the valve member 24 and causes it to rotate about its axis 26 and close the outlet aperture 22 in the lower region of the duct 18. Continued pumping by the pump 28 will reduce the level of water in the duct 18 to that shown in Figures 5 and 10. In this situation the head of water in the separation tank will tend to hold the flap valve closed. The pump 28 is left running throughout the transfer mode.
  • the mixing pump 52 is then started and run continuously. This pumps fluid from the mixing tank 50 into the main body of the reaction tank, thus causing water to cascade into the mixing tank over its upper edges . As this occurs, 3mm diameter low density polyethylene beads circulate through the pump 52 and outlet pipe 58 to reduce the deposition of solids therein. The levels of fluid outside and inside the mixing tank settle at a and a' respectively as shown in Figures 5 and 7.
  • reaction tank Throughout the operation of the plant the reaction tank is maintained at a particular temperature by temperature control means (not shown). Periodically nutrients are supplied to the reaction tank via the nutrient inlet pipe 60 by opening the nutrient inlet valve 64 or by the peristaltic pump and/or screw feed referred to above. This preferably occurs shortly after the start of the trap/digestion mode.
  • the composition of the nutrients supplied is controlled so as to maintain the acidity of the reaction tank at between pH6 and pH9.
  • a fluid level sensor 70 is provided near the top of the reaction tank and is connected to the processor which shuts the plant down and actuates an alarm in the event of water reaching the level of this third sensor 70. This may occur if for example the flap valve 24 should not open effectively for some reason.
  • Figures 12 and 13 show second and third embodiments 10b and 10c respectively of the invention in which like numerals have been used to designate like parts.
  • the construction and operation of these embodiments are similar to the construction and operation of the first embodiment unless otherwise indicated.
  • valve 24 is normally biased open by a float 88 connected to a vertical rod 90 at the upper end of which a container 92 is provided.
  • a float 88 connected to a vertical rod 90 at the upper end of which a container 92 is provided.
  • valve 96 When there is a requirement to close the valve 24 the container is filled with water from a header tank 94 via a valve 96.
  • valve 9C stops the supply of water to the container 92, drainage via a drain 98 allows the container 92 to empty thus allowing the float 88 to open the valve 24.
  • transfer of the buoyant contaminants into the reaction tank 14 via the trough 35 is effected by flushing of a cistern 100 which occurs when water supplied to the cistern via a valve 102 rises to the level d.
  • flushing water is supplied to the separation tank 12 on the opposite side to that on which the trough 35 is located.
  • the required daily loss from the reaction tank takes place via an outlet pipe 104 leading from an upper region of the mixing tank 50.
  • the mixing pump 52 stops, the levels both inside and outside the mixing tank will settle at c'.
  • the water inlet valve 66 controls a supply of water to the reaction tank so as to maintain the level of fluid in the mixing tank 50 at a' by means of a signal from switch S2 which is supplied to the controller 76.
  • a third embodiment 10c of the plant is shown in Figure 13. Separation of buoyant contaminants from contaminated water flowing through the plant will occur as described above. In this embodiment no valve is provided for preventing flow to the outlet 20. Instead a separation tank drain pump 110 is supplied which pumps fluid and sediment from a lower region of the separation tank 12 away from the plant. The drain pump 110 is run until fluid in the separation tank is lowered to the level of switch S4. In place of the high level trough 35 in the other two embodiments a low level trough or sump 112 is provided into which buoyant contaminants 78 will flow over a weir edge 116 when fluid is pumped by the transfer pump 42 from the reaction tank 14 into the separation tank 12. A contaminant delivery pump 114 is provided in the trough 112 and is used to pump buoyant contaminants from the trough 112 into the reaction tank. This embodiment is particularly useful when the contaminated water to be treated has a high sediment content.
  • the plant can be adapted to automatically trap buoyant fat and grease contaminants during the working day then mix the contaminants with microbes during a transfer mode conducted at night. Harmful chemicals in contaminated water passing through the plant can be prevented from coming into contact with the microbes in the reaction tank and the partial loss of microbes occurring during the transfer mode can be compensated for by microbe reproduction. Favourable conditions for the degradation to continue 23 hours a day can be maintained in the reaction tank. Operator intervention can thus be kept to a minimum and avoidance of the necessity to remove fat and grease from the plant for disposal can be achieved.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Microbiology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

Cette installation comprend un bassin de séparation (12) doté d'une canalisation d'évacuation (18) partant d'une zone inférieure du bassin de manière que les contaminants (78) qui flottent à la surface des eaux usées et entrent dans le bassin de séparation (12) par une canalisation d'admission (36) ne puissent pas sortir du réservoir par cette canalisation (18). Périodiquement, le bassin de séparation (12) est purgé par un courant d'eau propre fourni par un tuyau (40) sans qu'il y ait débordement dudit bassin (12), et les contaminants flottant à la surface sont chassés au-dessus d'un déversoir par un fluide amené dans le bassin de séparation (12) par des moyens de chasse, afin de se déverser dans un réservoir de réaction (14) adjacent dont la température et l'acidité sont régulées et qui contient des cultures durables de micro-organismes auxquels on apporte des substances nutritives. Les contaminants flottant à la surface peuvent tomber par gravité dans le réservoir de réaction (14) ou peuvent y être introduits par pompage. Les moyens de chasse peuvent comprendre une pompe (42) ou une citerne de chasse.
PCT/GB1994/002309 1993-10-21 1994-10-20 Installation de traitement des eaux usees et procede utilise dans cette installation WO1995011201A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9608212A GB2297500B (en) 1993-10-21 1994-10-20 Waste water treatment plant and method for use therein
AU79449/94A AU7944994A (en) 1993-10-21 1994-10-20 Waste water treatment plant and method for use therein

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939321712A GB9321712D0 (en) 1993-10-21 1993-10-21 Waste water treatment plant and method for use therein
GB9321712.3 1993-10-21

Publications (1)

Publication Number Publication Date
WO1995011201A1 true WO1995011201A1 (fr) 1995-04-27

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ID=10743900

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Application Number Title Priority Date Filing Date
PCT/GB1994/002309 WO1995011201A1 (fr) 1993-10-21 1994-10-20 Installation de traitement des eaux usees et procede utilise dans cette installation

Country Status (3)

Country Link
AU (1) AU7944994A (fr)
GB (2) GB9321712D0 (fr)
WO (1) WO1995011201A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010085955A1 (fr) * 2009-01-28 2010-08-05 P/F Mest Séparateur pour liquides de différentes densités
EP2641876A1 (fr) * 2012-03-19 2013-09-25 ATB Umwelttechnologien GmbH Dispositif de curage biologique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180530A (en) * 1985-08-07 1987-04-01 Pipeline Equipment Ltd Grease trap
FR2669916A1 (fr) * 1990-11-30 1992-06-05 Lyonnaise Eaux Dumez Procede de degradation biologique des graisses et dechets graisseux.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180530A (en) * 1985-08-07 1987-04-01 Pipeline Equipment Ltd Grease trap
FR2669916A1 (fr) * 1990-11-30 1992-06-05 Lyonnaise Eaux Dumez Procede de degradation biologique des graisses et dechets graisseux.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010085955A1 (fr) * 2009-01-28 2010-08-05 P/F Mest Séparateur pour liquides de différentes densités
EP2641876A1 (fr) * 2012-03-19 2013-09-25 ATB Umwelttechnologien GmbH Dispositif de curage biologique

Also Published As

Publication number Publication date
GB2297500B (en) 1997-09-17
GB2297500A (en) 1996-08-07
GB9321712D0 (en) 1993-12-15
AU7944994A (en) 1995-05-08
GB9608212D0 (en) 1996-06-26

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