WO2010058434A1 - Digesteur à réacteur vertical pour des boues biologiques - Google Patents

Digesteur à réacteur vertical pour des boues biologiques Download PDF

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Publication number
WO2010058434A1
WO2010058434A1 PCT/IT2008/000726 IT2008000726W WO2010058434A1 WO 2010058434 A1 WO2010058434 A1 WO 2010058434A1 IT 2008000726 W IT2008000726 W IT 2008000726W WO 2010058434 A1 WO2010058434 A1 WO 2010058434A1
Authority
WO
WIPO (PCT)
Prior art keywords
reactor
storage
sludges
biological
biological sludges
Prior art date
Application number
PCT/IT2008/000726
Other languages
English (en)
Inventor
Ranieri De Ferrante
Massimo Piccoli
Original Assignee
Hawk Partners Sas
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 Hawk Partners Sas filed Critical Hawk Partners Sas
Priority to PCT/IT2008/000726 priority Critical patent/WO2010058434A1/fr
Publication of WO2010058434A1 publication Critical patent/WO2010058434A1/fr

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
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • 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
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • 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
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/06—Nutrients for stimulating the growth of microorganisms
    • 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
    • Y02W10/20—Sludge processing

Definitions

  • Subject matter of the present invention id a system for digesting biological sludges, deriving from reduction of biochemical oxygen demand (BOD) in active sludge depuration systems, with remarkable advantages with respect to systems presently used.
  • BOD biochemical oxygen demand
  • Depuration of waste waters by active sludge systems determines production of polluting biological sludges, and high disposal costs.
  • average amount of depurated sludges (removable by shovel at 25% of solid material) for each inhabitant is of about 50 kg and in Italy average cost for disposal (including transportation, chemical products and transfer in a dump) is of 10 centesimal or more.
  • Said sludges further are a highly indirect pollution element, and meaningfully contribute to filling dumps.
  • Aerobic digestion process for sludges is promoted by:
  • A. continuous process aerobic digestors wherein said parameters cannot be controlled in an easy and economic way, thus having low efficiency. These low efficiencies are compensated by simplicity of use and - nowadays - this kind of digestor is, in the open tank version, the most diffused.
  • digestor is comprised of a vertical well or reactor, having a depth between 40 m and 100 m, which naturally acts under pressure (up to 11 atmospheres) and under insulation
  • Air moving countercurrent with respect to sludges entering within the digestor, aims to creating a dynamic balancing necessary for realizing bacteria beds, i.e. liquid/solid layers with a high sludge concentration containing bacteria at different levels within reactor, with a very high digestive efficiency. Said air further contributes to provide oxygen to the sludge oxidation process. Finally, oxygen permits further increasing concentration of under pressure oxygen, thus obtaining a more efficient oxidation for oxidation reaction.
  • two synergistic reaction sum up into the reactor - a chemical oxygenation reaction, promoted by high pressure within reactor.
  • a chemical oxygenation reaction promoted by high pressure within reactor.
  • Henry law on the bottom of reactor it is possible dissolving up to 10 times amount of oxygen that can be dissolved at surface level;
  • first one of the above reactions does not involve production of sludge, and thus, for each passage, abate amount of sludge much more that a purely biological reaction.
  • These reactions are even more difficult due to relevant sludge hydrolysis phenomenon during its exit, both as thermolisys (promoted by controlled temperature within reactor) and pressolisys (determined by embolism, caused by violent decompression of bacteria during the ascending path).
  • a digestor for biological sludges characterized in that it comprises: a storage and recirculation tank for said biological sludges, suitable to receiving sludge to be subjected to treatment; a reactor, placed downward said storage and recirculation tank, within which sludge arrives from said storage and recirculation tank, and within which a chemical and a biological reactions occur under high pressure condition determined by depth of reactor and under substantially uniform temperature; a flotation - sedimentation unit of said biological sludges downward said reactor, within which, said biological sludges are sedimented and partially recycled within said reactor; a storage tank, downward said flotation - sedimentation unit, wherein said biological sludges increase their concentration; and a de-hydration unit for said biological sludges, so that the latter are then disposed of.
  • said digestor can comprise one or more diffusers installed within said reactor, suitable to separately insufflate air and pure oxygen within said reactor.
  • air moving countercurrent with respect to said biological sludges, creates a dynamic balancing for formation of bacteria beds with high solid rate, so that bacteria contained within said biologic sludges carries out an efficient digestive action, thus contributing to provide oxygen to the oxidation process, said process being mainly supplied by pure oxygen, permitting obtaining an increase of concentration of the same oxygen under pressure for oxidation reaction.
  • said solid rate can reach 20 Kg/m 2 .
  • said digestor can comprise one or more probes installed in said reactor, suitable to measure and monitor temperature in said reactor, and controlling air and oxygen inlet within said reactor by diffusers.
  • said reactor can be substantially vertical.
  • said reactor, said recirculation tank, said flotation - sedimentation unit and said storage tank can be integrated in a single block.
  • said reactor can be installed within said storage and recirculation tank.
  • said reactor can be installed in an existing depuration system and can use one or more elements of the sludge line of the depuration system as storage - recirculation tank, flotation - sedimentation unit and storage tank.
  • figure 1 shows a scheme of the digestor system according to the invention
  • figure 2 shows a lateral section view of vertical reactor
  • figure 3 shows a functional block diagram of the system according to the invention
  • figure 4 shows a scheme of a system according to the invention, wherein the reactor is used in an existing system.
  • a storage and recirculation tank 1 suitable to receiving sludge to be subjected to treatment and to supply a reactor 2 positioned within the same.
  • Digestor further comprises a flotation - sedimentation unit 5, within which sludge is sent after having been subjected to treatment within reactor 2, to be sedimented and partially recycled within the same reactor
  • Proper oxygen (O 2 ) level is mainly monitored measuring temperature within reactor 2 and within different tanks, particular storage and recirculation tank 1 , by probes 4 shown in figure 2, positioned within the outlet length of reactor 2 (excess of oxygen determines an increase of temperature).
  • new system is comprised of a single block (see figure 1) comprising: reactor 2, recirculation tank 1 , flotation - sedimentation unit 5 and storage and thickening tank 3, the latter being placed downward the sedimentation unit 5 and before the de- hydration unit.
  • This single block makes all the functions usually demanded to p re-thicken ing, digestor and thickening units of traditional systems.
  • system according to the invention provides activation of pumps for extraction of sludges during the biological phase of the depuration system, in order to send them within storage and recirculation tank 1 , to proceed then to the reaction within reactor 2 and the thickening phase within storage and thickening tank 3. Finally, as already said, sludge is dehydrated and disposed.
  • reactor 2 is positioned alongside the existing digestor, thus acting as storage and recirculation tank 1, carrying out the sedimentation phase. Then, sludge subjected to treatment passes into the existing storage and thickening tank 3, to be then dehydrated.
  • Present invention has been described for illustrative and not limitative purposes with reference to preferred embodiments, but it is understood that variations and/or modifications can be introduced without departing from the relevant scope defined in the enclosed claims.

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)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Treatment Of Sludge (AREA)

Abstract

La présente invention porte sur un digesteur pour des boues biologiques, caractérisé en ce qu'il comprend : une cuve de stockage et de recirculation (1) pour lesdites boues biologiques, appropriée pour recevoir de la boue devant être soumise à un traitement ; un réacteur (2), placé en aval de ladite cuve de stockage et de recirculation (1), dans lequel la boue arrive en provenance de ladite cuve de stockage et de recirculation (1) et dans lequel des réactions chimiques et biologiques ont lieu à une pression élevée déterminée par la profondeur du réacteur (2) et à une température pratiquement uniforme ; une unité de flottation-sédimentation (5) desdites boues biologiques en aval dudit réacteur (2), dans laquelle lesdites boues biologiques sont amenées à sédimenter et partiellement recyclées vers ledit réacteur (2) ; une cuve de stockage (3), en aval de ladite unité de flottation-sédimentation (5), dans laquelle lesdites boues biologiques augmentent leur concentration ; et une unité de déshydratation pour lesdites boues biologiques, pour que ces dernières puissent être ensuite évacuées.
PCT/IT2008/000726 2008-11-24 2008-11-24 Digesteur à réacteur vertical pour des boues biologiques WO2010058434A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2008/000726 WO2010058434A1 (fr) 2008-11-24 2008-11-24 Digesteur à réacteur vertical pour des boues biologiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2008/000726 WO2010058434A1 (fr) 2008-11-24 2008-11-24 Digesteur à réacteur vertical pour des boues biologiques

Publications (1)

Publication Number Publication Date
WO2010058434A1 true WO2010058434A1 (fr) 2010-05-27

Family

ID=41280824

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2008/000726 WO2010058434A1 (fr) 2008-11-24 2008-11-24 Digesteur à réacteur vertical pour des boues biologiques

Country Status (1)

Country Link
WO (1) WO2010058434A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140183108A1 (en) * 2011-06-28 2014-07-03 H.C. Development S.R.L. Sewage water depuration plant, comprising a vertical reactor, with improved nitrogen treatment
WO2015186152A1 (fr) * 2014-06-06 2015-12-10 Ranieri De Ferrante Système de conditionnement du débit de recirculation d'une usine de traitement de boues activées

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069149A (en) * 1976-05-14 1978-01-17 Idaho Research Foundation, Inc. Continuous fermentation process and apparatus
GB2013646A (en) * 1978-02-06 1979-08-15 Itt Process for the Secondary Treatment of Wastewater
GB2118161A (en) * 1982-03-29 1983-10-26 Tatabanyai Szenbanyak Process and equipment for biological purification of waste waters by means of activated sludge
WO1992019547A1 (fr) * 1991-05-01 1992-11-12 Level Valley Dairy Company Systeme de traitement des eaux usees
EP1533277A2 (fr) * 1998-09-11 2005-05-25 Fuji Jukogyo Kabushiki Kaisha Procédé pour traiter les eaux usées contenant une résine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069149A (en) * 1976-05-14 1978-01-17 Idaho Research Foundation, Inc. Continuous fermentation process and apparatus
GB2013646A (en) * 1978-02-06 1979-08-15 Itt Process for the Secondary Treatment of Wastewater
GB2118161A (en) * 1982-03-29 1983-10-26 Tatabanyai Szenbanyak Process and equipment for biological purification of waste waters by means of activated sludge
WO1992019547A1 (fr) * 1991-05-01 1992-11-12 Level Valley Dairy Company Systeme de traitement des eaux usees
EP1533277A2 (fr) * 1998-09-11 2005-05-25 Fuji Jukogyo Kabushiki Kaisha Procédé pour traiter les eaux usées contenant une résine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140183108A1 (en) * 2011-06-28 2014-07-03 H.C. Development S.R.L. Sewage water depuration plant, comprising a vertical reactor, with improved nitrogen treatment
WO2015186152A1 (fr) * 2014-06-06 2015-12-10 Ranieri De Ferrante Système de conditionnement du débit de recirculation d'une usine de traitement de boues activées

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