EP3186202A1 - Conditioning system of the recirculation flow of an activated sludge treatment plant - Google Patents

Conditioning system of the recirculation flow of an activated sludge treatment plant

Info

Publication number
EP3186202A1
EP3186202A1 EP15751102.3A EP15751102A EP3186202A1 EP 3186202 A1 EP3186202 A1 EP 3186202A1 EP 15751102 A EP15751102 A EP 15751102A EP 3186202 A1 EP3186202 A1 EP 3186202A1
Authority
EP
European Patent Office
Prior art keywords
conditioning system
section
treatment plant
recirculation flow
sludge 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.)
Withdrawn
Application number
EP15751102.3A
Other languages
German (de)
French (fr)
Inventor
Ranieri De Ferrante
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3186202A1 publication Critical patent/EP3186202A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/06—Treatment of sludge; Devices therefor by oxidation
    • C02F11/08—Wet air oxidation
    • C02F11/083—Wet air oxidation using deep well reactors
    • 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
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/1221—Particular type of activated sludge processes comprising treatment of the recirculated sludge
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • 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
    • C02F2303/06—Sludge reduction, e.g. by lysis
    • 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
    • C02F3/22—Activated sludge processes using circulation pipes
    • C02F3/223—Activated sludge processes using circulation pipes using "air-lift"
    • 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 concerns a conditioning system of the recirculation flow of an active siudge treatment plant.
  • the invention relates to a system of the said type, with the aim of improving the effect of the recirculation flow and consequently increasing the potential of active siudge treatment plants of traditional type.
  • the invention refers to the field of the depuration of civil and industrial waste water, by means of an aerobic treatment performed bya more or less prolonged airing of the waters themeseifves within a biological reactor in the presence of a suspended microbial population (biomass).
  • a suspended microbial population biomass
  • an active sludge plant is represented by a reaction tank (aerobic, anoxic or anaerobic) where the contact, takes place between the bacterial population and the exhaust to be purified.
  • the aerated mixture, coming out from the tank, is sent to the sedimentation section where the flakes of active siudge are separated from the purified effluent, which can then be downloaded from the surface of the decanter, while the sludge is partially reintroduced info the system, by means of a circuit of recirculation, and partly is removed periodically as excess sludge to be disposed.
  • the solution according to the present invention aims to develop a system that allows also an active sludge treatment piant of traditional type to exploit all the components of action of a vertical reactor systems (including therefore the chemical oxidation and the bacterial lysis) and then, at least in part, to simulate their performance.
  • Purpose of the present invention is therefore to provide a conditioning system of the recirculation flow of an active sludge treatment plant that allows to overcome the limits of the treatment pianis of conventional type, le without a vertical reactor and to obtain the technical results previously described.
  • a further object of the invention is that said conditioning system can be realized with substantially contained costs, as fa? ' as both production costs and operating costs is concerned.
  • Another object of the invention is to propose a conditioning system of the recirculation flow of an active sludge treatment plant which is simple, safe and reliable.
  • a conditioning system of the recirculation flow of an active sludge treatment plant said plant comprising a biological section, an oxidation section, a sedimentation section and optionally a thickening section
  • said conditioning system being characterised in that It comprises a vertical reactor, having a depth equal to 40m or higher, said vertical reactor being provided internally with a compressed air distribution system and with one or more air lift conduits, said conditioning system comprising additionally a system of collection of sludge from said sedimentation section, from said oxidation section or from said thickening section and a system of feeding back of conditioned sludge at the head of the treatment plant.
  • said vertical reactor has an internal diameter of 300 - 1 100mm and said air lift conduits have diameter much smaller than that of said vertical reactor, more preferably in the range 2 - 5 inches.
  • said compressed air distribution system is comprised of air diffusers, said air lift conduits and said diffusers being connected to a same compressor.
  • system has continuous operation and, generally, does not require the addition of installed power significantly.
  • the system significantly reduces the production of sludge In excess and thus reduces very importantly the costs and the difficulties of management of the plant. Additionally, being the amount of sludge to be treated lower, the system allows the reduction of the line dedicated to sludges and consequently the recovery of areas to be used for other purposes.
  • the implementation of the conditioning system of the recirculation flow of an active sludge treatment plant according to the present invention improves the ability of the plant to which it is applied approximately of 10-15%, and lowers the operating cost of 15-25% (value determined using as a basis the economic parameters of the standard systems operating, for example, in Italy).
  • the conditioning system of the recirculation flow of an active sludge treatment plant allows to assign to other uses up to 20% of the existing area, greatly reduces odors and indirect pollution, by reducing the amount and increasing the rate of digestion of excess sludge to be disposed of.
  • FIG. 1 some major components of an active sludge treatment piant of traditional type are shown, and in particular, the biological section 1 , the sedimentation section 2 and the thickening section 3 of excess sludge
  • the water treated in the biological section 1 Is conveyed to the sedimentation section 2 through line 4.
  • the line 5 of the purified water the sine 6 of excess sludge pumped to the thickening section 3 and the line 7 of recirculation of the sludge to the biological section 1.
  • the figure additionally shows a conditioning system of the recirculation flow according to the present invention, Indicated as a whole by the reference number 10, fed with a part of the sludge of the recirculation flow through a line 8 and which conveys the treated sludge again in the line 7 of recirculation of the sludge to the biological section 1 (but more In general at the head of the treatment plant, understood as any section of the plant before the sedimentation section) through the line 9.
  • the conditioning system 10 of the recirculation flow is made up of components described below and In the first place by a connection system, of which is also a part the line 8 for feeding the conditioning system 10 of the recirculation flow, which allows the removal of sludge from the sedimentation section 2, but which can also pick up the sludge from the end of the oxidation section (not shown) or also from the thickening section 3.
  • the second component of the conditioning system 10 is a tank 1 1 , 8
  • a vertical reactor 12 which can be made of reinforced concrete, metal sheet or prefabricated, of a depth consistent with the hydraulic profile of the existing treatment plant, at the center of which is positioned a vertical reactor 12, which has a depth of 40-120 meters, and an inner diameter of 300-1 100 mm, preferably but not necessarily made with a steei jacket and a high density polyethylene (HOPE) jacket said vertical reactor 12 being positioned in an appropriate manner with respect to the existing purification plant, and provided internally with one or will more conduits of upflow due to the dragging operated by air introduced from the outside by a pump, aiso called air lift conduits (not shown), of a diameter much less than that of the vertical reactor (in the order of 2 ⁇ ⁇ 5 inches).
  • HOPE high density polyethylene
  • the air lift conduits should be as small as possible to increase the speed of ascent with equal volume of sludge, but at the same time iarge enough to allow an upward flow without hindrance and a sufficient number of repetition of the cycles of compression, oxygenation and depressurization 29.
  • inside the vertical reactor 12 is also disposed a compressed air distribution system, realized by means of d iff users that can be connected to the same compressor which supplies the air Isft conduits. St is important to note that the entry of air inside the reactor does not have the objective of producing oxygenation by itself, whether biological or chemical, but mainly to allow the bacteria to store gas which, in the ascent phase inside the air lift conduits, can increase in size, causing the lysis of the bacteria themselves.
  • the conditioning system 10 of the recirculation flow is provided with a return system, which is also part of the line 9, which connects, in water tight manner, the tank 1 1 of the conditioning system 10 to the biological section 1 (but more generally to the head of the treatment plant, understood as any section of the plant which precedes the sedimentation section), allowing the recirculation of the biological material resulting from the conditioning treatment.
  • the conditioning system 10 is provided with a system of gates, valves and controls, managed directly or by means of PC, which allows to direct the various flows, with particular attention to the flow outgoing from the air lift conduits, alternatively and/or simultaneously in partial mode, in the recirculation flow to the head of the treatment plant, In the recirculation flow within the tank 1 1 to get more conditioning cycles, or to a storage tank of sludge.
  • the conditioning system 10 may be provided with a system of spilling of the sludge In excess, which can replace or work with the thickening section, if present, by exploiting the ability of the conditioning system to concentrate the sludge by flotation.
  • conditioning system 10 An extreme case of use of the conditioning system 10 according to the present invention occurs in the case where to the conditioning system 10 is conveyed only the sludge in excess, and the recirculation flow is reduced to the partly clarified waters.
  • the conditioning system 10 acts in a pure digester mode, conditioning and reducing very importantly - more than 50% - the excess sludge to be disposed of, without, however, having any effect on overall performance of the plant to which it is applied.
  • the conditioning system 10 acts in a pure digester mode, conditioning and reducing very importantly - more than 50% - the excess sludge to be disposed of, without, however, having any effect on overall performance of the plant to which it is applied.
  • the conditioning system 10 acts in a pure digester mode, conditioning and reducing very importantly - more than 50% - the excess sludge to be disposed of, without, however, having any effect on overall performance of the plant to which it is applied.
  • the tank 1 1 of the conditioning system would have a reversed frusto - pyramidal shape, to facilitate the flotation effect.

Landscapes

  • 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)
  • Activated Sludge Processes (AREA)

Abstract

The present invention concerns a conditioning system (10) of the recirculation flow (7) of an active sludge treatment plant, said plant comprising a biological section (1 ), an oxidation section, a sedimentation section (2) and optionally a thickening section (3), said conditioning system (10) being characterised In that it comprises a vertical reactor (12), having a depth equal to 40m or higher, said vertical reactor being provided internally with a compressed air distribution system and with one or more air lift conduits, said conditioning system (10) comprising additionally a system of collection of sludge from said sedimentation section (2), from said oxidation section or from said thickening section (3) and a system of feeding back of conditioned sludge at the head of the treatment plant.

Description

CONDITIONING SYSTEM OF THE RECIRCULATION FLOW OF AN
ACTIVATED SLUDGE TREATMENT PLANT
The present Invention concerns a conditioning system of the recirculation flow of an active siudge treatment plant.
More particularly the invention relates to a system of the said type, with the aim of improving the effect of the recirculation flow and consequently increasing the potential of active siudge treatment plants of traditional type.
The invention refers to the field of the depuration of civil and industrial waste water, by means of an aerobic treatment performed bya more or less prolonged airing of the waters themeseifves within a biological reactor in the presence of a suspended microbial population (biomass). In order to make the water resulting from the treatment in accordance with the provisions of the regulations In force.
Schematically, an active sludge plant is represented by a reaction tank (aerobic, anoxic or anaerobic) where the contact, takes place between the bacterial population and the exhaust to be purified. The aerated mixture, coming out from the tank, is sent to the sedimentation section where the flakes of active siudge are separated from the purified effluent, which can then be downloaded from the surface of the decanter, while the sludge is partially reintroduced info the system, by means of a circuit of recirculation, and partly is removed periodically as excess sludge to be disposed.
It Is known that in the field of the plants for the treatment of waste water, excellent results have been obtained through the introduction of a technology called deep well, obtained in installations specifically equipped with a vertical reactor completely buried and covered, in which the biological reaction of active sludges and the chimica oxidation are particularly effective thanks to the high pressure present in the vertical reactor, in particular as they proceed towards the bottom of the same, due to the above hydrostatic pressure.
In particular, It is known the excellent performance of the vertical reactor treatment plant of the latest generation, both as far as the purifying effectiveness is concerned, and as far as the management costi s concerned. Both of these benefits depend on the succession, in such plants, of three actions that act on wastewater:
- a biological reaction, comparable to that of normal plants with active sludges:
- a chemical oxidation favored by high operating pressures (6-8 atmospheres):
- a physical lysis of the bacteria, caused by the fast and important depressurization which they are subject to in consequence of the sudden removal of the same from the bottom of the vertical reactor, due to appropriate conveying systems by means of air.
By contrast, in the active sludge treatment plants of conventional type, ie devoid of the vertical reactor, only the first of these actions occurs, while the second is not feasible in practical terms, given the difficulty of working at high pressures, and the third is applied only rarely, for example by means of ultrasound , and never in the phase of treatment of waste water, but rather in the phase of digestion of sludges In excess, in these conditions, ultrasound, breaking the membrane of the bacteria, has an action of reducing the amount of sludge, but do not generate any improvement in the functioning of the basic process of purification. Additionally, these Interventions are discontinuous (batch), with complex and inefficient management modes.
in this context it is included the solution according to the present invention, which aims to develop a system that allows also an active sludge treatment piant of traditional type to exploit all the components of action of a vertical reactor systems (including therefore the chemical oxidation and the bacterial lysis) and then, at least in part, to simulate their performance.
For this to happen, It is a critical condition that these actions are part of the basic process, also working continuously and in tune with the existing stages.
To make the solution of practical and economic feasibility, it is also important that such intervention is possible: - at low cost,
- without requiring large spaces (which are often not available in existing plants), and
- without interfering, during the phases of creation of the new system, with the exercise of the pre-existing plant.
These and other results are obtained according to the present invention proposing a conditioning system of the recirculation flow of an active sludge treatment plant that allows to subject at least part of the material of recirculation and/or in excess to a chemical oxidation and to a physical lysis of the bacteria, while continuing to ensure the biological reaction typical of normal plants with active sludges.
Purpose of the present invention is therefore to provide a conditioning system of the recirculation flow of an active sludge treatment plant that allows to overcome the limits of the treatment pianis of conventional type, le without a vertical reactor and to obtain the technical results previously described.
A further object of the invention is that said conditioning system can be realized with substantially contained costs, as fa?' as both production costs and operating costs is concerned.
Another object of the invention is to propose a conditioning system of the recirculation flow of an active sludge treatment plant which is simple, safe and reliable.
If is therefore a specific object of the present invention a conditioning system of the recirculation flow of an active sludge treatment plant, said plant comprising a biological section, an oxidation section, a sedimentation section and optionally a thickening section, said conditioning system being characterised in that It comprises a vertical reactor, having a depth equal to 40m or higher, said vertical reactor being provided internally with a compressed air distribution system and with one or more air lift conduits, said conditioning system comprising additionally a system of collection of sludge from said sedimentation section, from said oxidation section or from said thickening section and a system of feeding back of conditioned sludge at the head of the treatment plant. Preferably, according to the invention, said vertical reactor has an internal diameter of 300 - 1 100mm and said air lift conduits have diameter much smaller than that of said vertical reactor, more preferably in the range 2 - 5 inches.
Additionally, according to the present invention, said compressed air distribution system is comprised of air diffusers, said air lift conduits and said diffusers being connected to a same compressor.
It Is clear the effectiveness of the conditioning system of the recirculation flow of an active sludge treatment plant of the present invention, which allows to enhance the action of the recirculation flow and consequently:
- to allow oxidation to operate in most effective conditions;
- to allow to the plant to operate with a lower recirculation ratio; and
- to increase (albeit slightly) the capacity of the plant itself.
Additionally, the system has continuous operation and, generally, does not require the addition of installed power significantly.
As a further effect, of great importance both from the economical and the environmental points of view, the system significantly reduces the production of sludge In excess and thus reduces very importantly the costs and the difficulties of management of the plant. Additionally, being the amount of sludge to be treated lower, the system allows the reduction of the line dedicated to sludges and consequently the recovery of areas to be used for other purposes.
In quantitative terms, the implementation of the conditioning system of the recirculation flow of an active sludge treatment plant according to the present invention improves the ability of the plant to which it is applied approximately of 10-15%, and lowers the operating cost of 15-25% (value determined using as a basis the economic parameters of the standard systems operating, for example, in Italy).
The overall effect, then, In terms of operating cost/amount of treated waste water is of 25 - 35%.
From the environmental point of view, additionally, the conditioning system of the recirculation flow of an active sludge treatment plant according to the present invention allows to assign to other uses up to 20% of the existing area, greatly reduces odors and indirect pollution, by reducing the amount and increasing the rate of digestion of excess sludge to be disposed of.
The present invention will be now described, for illustrative but not limitative purposes, according to its preferred embodiment, with particular reference to Figure 1 of the accompanying drawings, in which it is shown a schematic diagram of an active sludge treatment plant provided vvsth a conditioning system of the recirculation flow according to the present Invention.
Referring to Figure 1 . some major components of an active sludge treatment piant of traditional type are shown, and in particular, the biological section 1 , the sedimentation section 2 and the thickening section 3 of excess sludge The water treated in the biological section 1 Is conveyed to the sedimentation section 2 through line 4. Additionally, from the sedimentation section 2 come the line 5 of the purified water, the sine 6 of excess sludge pumped to the thickening section 3 and the line 7 of recirculation of the sludge to the biological section 1. The figure additionally shows a conditioning system of the recirculation flow according to the present invention, Indicated as a whole by the reference number 10, fed with a part of the sludge of the recirculation flow through a line 8 and which conveys the treated sludge again in the line 7 of recirculation of the sludge to the biological section 1 (but more In general at the head of the treatment plant, understood as any section of the plant before the sedimentation section) through the line 9.
in particular, the conditioning system 10 of the recirculation flow is made up of components described below and In the first place by a connection system, of which is also a part the line 8 for feeding the conditioning system 10 of the recirculation flow, which allows the removal of sludge from the sedimentation section 2, but which can also pick up the sludge from the end of the oxidation section (not shown) or also from the thickening section 3.
The second component of the conditioning system 10 is a tank 1 1 , 8
which can be made of reinforced concrete, metal sheet or prefabricated, of a depth consistent with the hydraulic profile of the existing treatment plant, at the center of which is positioned a vertical reactor 12, which has a depth of 40-120 meters, and an inner diameter of 300-1 100 mm, preferably but not necessarily made with a steei jacket and a high density polyethylene (HOPE) jacket said vertical reactor 12 being positioned in an appropriate manner with respect to the existing purification plant, and provided internally with one or will more conduits of upflow due to the dragging operated by air introduced from the outside by a pump, aiso called air lift conduits (not shown), of a diameter much less than that of the vertical reactor (in the order of 2 ■· 5 inches). The air lift conduits should be as small as possible to increase the speed of ascent with equal volume of sludge, but at the same time iarge enough to allow an upward flow without hindrance and a sufficient number of repetition of the cycles of compression, oxygenation and depressurization 29. inside the vertical reactor 12 is also disposed a compressed air distribution system, realized by means of d iff users that can be connected to the same compressor which supplies the air Isft conduits. St is important to note that the entry of air inside the reactor does not have the objective of producing oxygenation by itself, whether biological or chemical, but mainly to allow the bacteria to store gas which, in the ascent phase inside the air lift conduits, can increase in size, causing the lysis of the bacteria themselves.
Finally, the conditioning system 10 of the recirculation flow is provided with a return system, which is also part of the line 9, which connects, in water tight manner, the tank 1 1 of the conditioning system 10 to the biological section 1 (but more generally to the head of the treatment plant, understood as any section of the plant which precedes the sedimentation section), allowing the recirculation of the biological material resulting from the conditioning treatment.
In addition, the conditioning system 10 is provided with a system of gates, valves and controls, managed directly or by means of PC, which allows to direct the various flows, with particular attention to the flow outgoing from the air lift conduits, alternatively and/or simultaneously in partial mode, in the recirculation flow to the head of the treatment plant, In the recirculation flow within the tank 1 1 to get more conditioning cycles, or to a storage tank of sludge.
Still, the conditioning system 10 may be provided with a system of spilling of the sludge In excess, which can replace or work with the thickening section, if present, by exploiting the ability of the conditioning system to concentrate the sludge by flotation.
An extreme case of use of the conditioning system 10 according to the present invention occurs in the case where to the conditioning system 10 is conveyed only the sludge in excess, and the recirculation flow is reduced to the partly clarified waters. In this case, the conditioning system 10 acts in a pure digester mode, conditioning and reducing very importantly - more than 50% - the excess sludge to be disposed of, without, however, having any effect on overall performance of the plant to which it is applied. In this case, obviously:
- the sludge to be treated would be spilled from a well downstream of the sedimentation section,
- the restitution system would not be present.
- a line of recirculation would be present only for the clarified water,
) - the tank 1 1 of the conditioning system would have a reversed frusto - pyramidal shape, to facilitate the flotation effect.
The present invention has been descrive for illustrative but not limitative purposed, according to its preferred embodiments, but it I sto be understood that variations and/or modifications can be made by those j skilled in the art without departing from the relative scope of protection, as defined by the enclosed claims.

Claims

1 } Conditioning system (10) of the recirculation flow (7) of an active sludge treatment plant, said plant comprising a biological section (1 ), an oxidation section, a sedimentation section (2) and optionally a thickening section (3), said conditioning system (10) being characterised in that it comprises a vertical reactor (12), having a depth equal to 40m or higher, said vertical reactor being provided internally with a compressed air distribution system and with one or more air lift conduits, said conditioning system (10) comprising additionally a system of collection of sludge from said sedimentation section (2), from said oxidation section or from said thickening section (3) and a system of feeding back of conditioned sludge at the head of the treatment plant.
2) Conditioning system (10) of the recirculation flow (7) of an active sludge treatment plant according to claim 1 , characterised in that said vertical reactor (12) has an internal diameter of 300 - 1 100 mm.
3) Conditioning system (10) of the recirculation flow (7) of an active sludge treatment plant according to claim 1 or 2, characterised in that said air lift conduits have diameter much smaller than that of said vertical reactor.
4) Conditioning system (10) of the recirculation flow (7) of an active sludge treatment plant according to claim 3, characterised in that said air lift conduits have a diameter in the range of 2 - 5 inches.
5) Conditioning system (10) of the recirculation flow (7) of an active sludge treatment plant according to any one of the preceding claims., characterised In that said compressed air distribution system is comprised of air d iff users.
6) Conditioning system (10) of the recirculation flow (7) of an active sludge treatment plant according to claim 5, characterised in that said air lift conduits and said air d iff users are connected to a same compressor.
EP15751102.3A 2014-06-06 2015-06-08 Conditioning system of the recirculation flow of an activated sludge treatment plant Withdrawn EP3186202A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM20140293 2014-06-06
PCT/IT2015/000149 WO2015186152A1 (en) 2014-06-06 2015-06-08 Conditioning system of the recirculation flow of an activated sludge treatment plant

Publications (1)

Publication Number Publication Date
EP3186202A1 true EP3186202A1 (en) 2017-07-05

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Country Status (2)

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WO (1) WO2015186152A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2476614A1 (en) * 2001-02-23 2002-09-19 V.A.I. Ltd. Methods and apparatus for biological treatment of waste waters
WO2010058434A1 (en) * 2008-11-24 2010-05-27 Hawk Partners Sas Vertical rector digestor for biological sludges
ITRM20110340A1 (en) * 2011-06-28 2012-12-29 H C Dev S R L PURIFICATION SYSTEM FOR CIVIL AND INDUSTRIAL WASTEWATER WITH VERTICAL REACTOR.
ITRM20110341A1 (en) * 2011-06-28 2012-12-29 H C Dev S R L PURIFICATION PLANT FOR CIVIL AND INDUSTRIAL WASTE WATERS WITH VERTICAL REACTOR, WITH IMPROVED NITROGEN TREATMENT CHARACTERISTICS.

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015186152A1 *

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