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WO1995011355A1 - Installation de traitement d'eaux d'egout - Google Patents

Installation de traitement d'eaux d'egout Download PDF

Info

Publication number
WO1995011355A1
WO1995011355A1 PCT/GB1994/002318 GB9402318W WO9511355A1 WO 1995011355 A1 WO1995011355 A1 WO 1995011355A1 GB 9402318 W GB9402318 W GB 9402318W WO 9511355 A1 WO9511355 A1 WO 9511355A1
Authority
WO
WIPO (PCT)
Prior art keywords
fraction
sewage
treatment plant
separator
screening
Prior art date
Application number
PCT/GB1994/002318
Other languages
English (en)
Inventor
William Storey
Original Assignee
Babcock Water Engineering Limited
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 Babcock Water Engineering Limited filed Critical Babcock Water Engineering Limited
Priority to AU79457/94A priority Critical patent/AU7945794A/en
Publication of WO1995011355A1 publication Critical patent/WO1995011355A1/fr

Links

Classifications

    • 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
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates

Definitions

  • This invention relates to sewage treatment plant and, more particularly, to inlet works of sewage treatment plant subject to sudden influxes and storm sewage from an associated sewerage system.
  • sewage treatment plant including biological treatment apparatus discharging treated water to a river or sea and storm tank means arranged to accumulate temporarily sudden influxes of sewage flow and discharge accumulated sewage flow at a controlled rate to the biological treatment apparatus.
  • the putrescent and other solid material is discharged intermittently to a mobile tanker or continuously to a suitable closed receiver from which the material is removed at intervals.
  • a sewage treatment plant including a separator adapted to effect separation of an incoming stream of sewage from a sewerage system into a first fraction having a high water content and a low sludge content and into a second fraction having a high sludge content and a low water content.
  • means are provided to adjust and proportion the water content and the sludge content within the first and second fractions depending upon the incoming stream flow rate.
  • screening apparatus is positioned on the outlet from the separator for the first fraction and is adapted to remove buoyant material from the first fraction.
  • screening and degritting apparatus is positioned on the outlet from the separator for the second fraction and is adapted to remove off-line screenings and grit from the second fraction.
  • effluent treatment means are arranged to receive effluent discharge from the first and second screening apparatus.
  • a means of flow control is provided to regulate and adjust the flow rate of the second fraction from the separator to the second screening and degritting apparatus.
  • Buoyant material removed from the first fraction may be discharged to the screening and degritting apparatus on the outlet from the separator for the second fraction.
  • the invention also includes the provision of control means arranged to adjust and alter the operational philosophy of the treatment plant depending upon the incoming stream flow rate.
  • a sewage treatment plant including separators arranged in parallel and each adapted to effect separation of an incoming stream of sewage from a sewerage system into a first fraction having a high water content and a low sludge content and into a second fraction having a high sludge content and low water content, the first fractions being directed for discharge to a river or sea and the second fractions being directed toward a common second screening apparatus.
  • one of the separators may be dimensioned to have a capacity to accommodate normal sewage flow and the remaining separator or separators dimensioned to have a capacity to accommodate sudden influxes or storm surges.
  • Figure 1 is a first arrangement of a sewage treatment plant
  • Figure 2 is an alternative arrangement of a sewage treatment plant.
  • a sewerage system 2 discharges to an inlet 4 of a dynamic separator apparatus 6.
  • the inflow is fractioned into a first, high water content, low sludge content fraction discharging to a first screening apparatus 8 and into a second, high sludge content, low water content fraction discharging to an outlet 10.
  • Discharge through the outlet 10 is effected through a pump 12, the throughput of which may be controlled by means of a signal derived from a flow rate sensor 14 positioned in the inlet 4.
  • the pump 12 discharges through an outlet 16 to a second screening apparatus 18 arranged to remove off-line screenings and grit and discharge effluent to a pump 20.
  • the pump 20 discharges the effluent through an outlet 22 having a confluence 24 with an effluent outlet 26 from the first screening apparatus 8 to discharge the combined stream through a duct 28 to a storm overflow chamber 30.
  • Overflow from the chamber 30 is accommodated in storm tanks 32 with the chamber 30 having a regulated flow outlet 34 to the effluent treatment plant 36.
  • Screenings of buoyant material from the first screening apparatus 8 are discharged through a line 38 connecting with the outlet 16 from the pump 12 to the second screening apparatus 18, an external source of water 46 being introduced at the first screening apparatus 8, if reguired, to convey the buoyant material to the second screening apparatus 18.
  • sewage inflow from the system 2 under all conditions is discharged to the dynamic separator apparatus 6 and separated into first and second fractions with proportioning of the fractions being controlled by the pump 12 in accord with a signal from the flow rate sensor 14 to optimise the performance of the apparatus in removing screenings and grit.
  • the remainder of the plant may be designed to have a capacity appropriate to normal operation of the sewerage system rather than having an over-capacity allowing for sudden influxes, thereby giving an economy in land usage and construction costs.
  • the arrangement allows for the provision of compact treatment sites, this enables the sites, such as the dynamic separator apparatus 6 and the second screening apparatus 18, to be roofed over to contain odours and limit access.
  • the sources of the odours are thus more predictable they may be specifically targeted to facilitate removal.
  • a proportioning valve 40 is positioned adjacent the outlet from the pump 20 and serves to divert all or a proportion of the effluent output from the pump 20 to a re-cycling line 42 (shown in chain dotted outline) to return all or a proportion of the effluent to the inlet 4 in order to maintain a flow rate within the separator 6 at an optimum value at times when the flow rate would otherwise be below the optimum value.
  • non-return means 44 are positioned in the respective lines to prevent undesired backflow.
  • an air and water mixture stream may be introduced from an external source through line 47 for injection through a line 48 discharging adjacent the inlet to the dynamic separator 6 and, or alternatively, through a line 50 discharging into the outlet 10. Discharge of the air and water mixture is controlled by means of a signal derived from the flow rate sensor. Such air and water discharges assist control and separation of the associated, injected streams.
  • two, or more, dynamic separator apparatuses 6 of substantially similar capacity are arranged to receive parallel inputs from the sewerage system 2.
  • the high water content, low sludge content fractions discharged from the apparatuses are combined for discharge to the storm overflow chamber 30.
  • the high sludge content, low water content fractions are discharged through respective pumps 12 and combined for discharge to a common second screening apparatus 18.
  • a sewerage system 2 discharging to an initial storm chamber 52 discharging in turn to a composite parallel arrangement of a first dynamic separator apparatus 54 having an inlet 56 and a second dynamic separator apparatus 58 having an inlet 60.
  • the first dynamic separator apparatus 54 is designed to have a capacity sufficient to accommodate an anticipated full treatment flow of sewage and discharges a high water content, low sludge content fraction through first screening apparatus 62 to an effluent treatment plant 64 for biological treatment and discharge to a river or sea.
  • a high sludge content, low water content fraction is discharged from the first dynamic separator apparatus 54 through a pump 66 to a second screening apparatus 68 for removal of the bulk of the sludge content with the remainder of the fraction being returned through line 70 to the inlet 56.
  • the second dynamic separator apparatus 58 is designed to have a capacity sufficient to accommodate an anticipated sudden influx or storm surge and discharges a high water content, low sludge content fraction through first screening apparatus 72 to a main overflow storm chamber 74 and storm tank 76 arranged to accommodate temporarily the sudden influx and provide for a controlled rate discharge to a river or sea.
  • a high sludge content, low water content fraction is discharged from the second dynamic separator apparatus through a pump 78 discharging to the inlet 56 of the first dynamic separating apparatus 54.
  • Valves 78, 80 are positioned on the inlets 56,60 and are actuated by means of a signal derived from a flow rate sensor 82 at the outlet from the sewerage system.
  • all of the sewage inflow is directed toward the first dynamic separation apparatus 54, which effects a separation of the sewage stream into the two fractions.
  • the high water content, low sludge content fraction is discharged through the first screening apparatus 62 to the effluent treatment plant 64 and the high sludge content, low water content fraction is discharged through the second screening apparatus 68 and the residual water returned to the inlet 56.
  • the increased flow is at first accommodated in the initial storm chamber 52 but, upon a relatively steady excess flow being established, the output from the initial storm chamber is directed to both the first and the second dynamic separator apparatuses. Since the excess flow will have a proportionately lower biological content due to the diluting effect of the storm water, it is acceptable to discharge the high water content, low sludge content fraction produced from the second dynamic separator apparatus 58 at a controlled rate to a river or sea with the main overflow storm chamber 74 and storm tank 76 accommodating temporary excesses of flow.
  • the high sludge content, low water content fraction separated in the second dynamic separator apparatus 58 is extracted through the pump and discharged to the inlet 56 of the first dynamic separator apparatus 54.
  • first and second dynamic separator apparatuses 54, 58 This arrangement permits the first and second dynamic separator apparatuses 54, 58 to be dimensioned appropriate to anticipated flows under normal conditions and storm flow conditions to achieve configuration for optimum separation effect at least in the first dynamic separator apparatus 54.
  • the initial storm chamber 52 for temporary accumulation of a storm flow, and regulating the flows to the first and second dynamic separator apparatuses, flow rates to the respective separator apparatuses approaching the individual design flow rates for optimum separation effect may be achieved.
  • the first storm chamber may be dispensed with, particularly in situations where space for siting the chamber is not available.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)

Abstract

Installation de traitement d'eaux d'égoût recevant un courant d'arrivée d'eaux d'égoût à partir d'un système d'égoût (2) soumis à de soudaines arrivées ou à des refoulements d'eaux pluviales. Ce système comprend un séparateur dynamique (6) conçu pour effectuer une séparation du courant d'eaux d'égoût d'arrivée en une premièr fraction à teneur élevée en eau et à faible teneur en boues, et une seconde fraction à teneur élevée en boues et à faible teneur en eau. La première fraction est évacuée vers une installation (36) de traitement d'effluent, les arrivées soudaines étant temporairement accumulées dans une chambre (30) et un réservoir (32) d'eaux pluviales. La majeure partie des boues est transportée dans la seconde fraction et extraite dans un appareil (18) de tamisage et de dessablement. En conséquence, les odeurs associées aux matières putrescentes présentes dans les boues sont pour la plupart confinées dans le séparateur dynamique (6) et dans l'appareil de tamisage et de dessablement (18), qui peuvent être recouverts d'un toit. En outre, dans la mseure où l'eau relativement propre de la première fraction peut être temporairement accumulée dans la chambre et le réservoir (30, 32) d'eaux pluviales sans dégager d'odeurs persistantes, et peut être évacuée à une vitesse régulée, l'installation (36) de traitement d'effluent peut présenter des dimensions lui donnant la capacité de recevoir un écoulement d'eau d'égoût normal plutôt que des arrivées subites ou des refoulements d'eaux pluviales, ce qui permet de réaliser des économies appréciables en matière d'investissement et de frais d'exploitation. On peut positionner un ou plusieurs séparateurs dynamiques supplémentaires parallèlement au premier séparateur, afin de prendre en charge des arrivées ou des refoulements soudains d'eaux pluviales.
PCT/GB1994/002318 1993-10-22 1994-10-21 Installation de traitement d'eaux d'egout WO1995011355A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU79457/94A AU7945794A (en) 1993-10-22 1994-10-21 Sewage treatment plant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9321873.3 1993-10-22
GB939321873A GB9321873D0 (en) 1993-10-22 1993-10-22 Improvements relating to sewerage treatment plant

Publications (1)

Publication Number Publication Date
WO1995011355A1 true WO1995011355A1 (fr) 1995-04-27

Family

ID=10744003

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/002318 WO1995011355A1 (fr) 1993-10-22 1994-10-21 Installation de traitement d'eaux d'egout

Country Status (3)

Country Link
AU (1) AU7945794A (fr)
GB (1) GB9321873D0 (fr)
WO (1) WO1995011355A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2739094A1 (fr) * 1995-09-21 1997-03-28 Omnium Traitement Valorisa Procede et installation de dessablage et de decantation physico-chimique d'effluents urbains ou industriels
CN111364581A (zh) * 2018-12-25 2020-07-03 武汉圣禹排水系统有限公司 一种基于现有管网的清污分流系统的改造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1023852A (fr) * 1950-06-23 1953-03-25 Décharge à séparation d'eau de pluie pour installations de drainage des eaux de villes
WO1988006570A1 (fr) * 1987-02-27 1988-09-07 Lorenz Guenter Dephosphatation et (de)nitrification biologiques
FR2684403A1 (fr) * 1991-11-30 1993-06-04 Vogelsberger Silo Behalterbau Dispositif de tamisage pour des installations circulaires d'evacuation d'eau pluviale.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1023852A (fr) * 1950-06-23 1953-03-25 Décharge à séparation d'eau de pluie pour installations de drainage des eaux de villes
WO1988006570A1 (fr) * 1987-02-27 1988-09-07 Lorenz Guenter Dephosphatation et (de)nitrification biologiques
FR2684403A1 (fr) * 1991-11-30 1993-06-04 Vogelsberger Silo Behalterbau Dispositif de tamisage pour des installations circulaires d'evacuation d'eau pluviale.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PROF.IR.A.C.J. KOOT: "Behandeling van afvalwater", 1980, UITGEVERIJ WALTMAN, DELFT *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2739094A1 (fr) * 1995-09-21 1997-03-28 Omnium Traitement Valorisa Procede et installation de dessablage et de decantation physico-chimique d'effluents urbains ou industriels
US5770091A (en) * 1995-09-21 1998-06-23 Omnium De Traitement Et De Valorisation Method of plain sedimentation and physical-chemical sedimentation of domestic or industrial waste water
CN111364581A (zh) * 2018-12-25 2020-07-03 武汉圣禹排水系统有限公司 一种基于现有管网的清污分流系统的改造方法

Also Published As

Publication number Publication date
AU7945794A (en) 1995-05-08
GB9321873D0 (en) 1993-12-15

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