WO2002036506A1 - Procede et appareil de traitement des boues - Google Patents

Procede et appareil de traitement des boues Download PDF

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Publication number
WO2002036506A1
WO2002036506A1 PCT/GB2001/004877 GB0104877W WO0236506A1 WO 2002036506 A1 WO2002036506 A1 WO 2002036506A1 GB 0104877 W GB0104877 W GB 0104877W WO 0236506 A1 WO0236506 A1 WO 0236506A1
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
temperature
steam
treatment
heating
Prior art date
Application number
PCT/GB2001/004877
Other languages
English (en)
Inventor
Paul Zuber
Original Assignee
Biwater Treatment 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 Biwater Treatment Limited filed Critical Biwater Treatment Limited
Priority to AU2002212485A priority Critical patent/AU2002212485A1/en
Publication of WO2002036506A1 publication Critical patent/WO2002036506A1/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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • C02F11/185—Treatment of sludge; Devices therefor by thermal conditioning by pasteurisation

Definitions

  • the present invention relates to a method and apparatus for the treatment of sludge.
  • Sludge contains pathogenic bacteria, viruses and protozoa together with other parasites which can present a potential health risk to humans, animals and. plants, particularly if that sludge is used agriculturally.
  • a pasteurisation step should be included as a pre-treatment to the normal sewage treatment process, that is before the step of mesophilic anaerobic digestion (MAD treatment).
  • MAD treatment mesophilic anaerobic digestion
  • a method for the treatment of sludge comprising the step of heating the sludge to a temperature suitable for sludge pasteurisation by direct, in-line injection of low pressure steam into the flowing sludge.
  • the low-pressure steam injected into the sludge is open to atmospheric pressure.
  • the steam is injected into the flowing sludge and in counterflow to the sludge. This enables efficient mixing of the steam and sludge for both even transfer and good energy transfer.
  • the temperature of the steam heated sludge is automatically monitored and if the temperature is below a defined minimum the sludge is returned for further heating by the steam. This ensures that a
  • the method may further comprise the step of batch storage of the steam heated sludge for a predetermined period of time at temperature to achieve pasteurisation. This ensures that the sludge is maintained at temperature for an appropriate length of time in order to achieve pasteurisation of the sludge.
  • the method may further comprise the step of automatically monitoring the temperature of the heated sludge at the end of the batch storage time and if the temperature is below a predetermined minimum
  • the method may comprise the additional step of cooling the sludge after holding to bring the temperature of the sludge down to that required for the next stage of treatment.
  • the method comprises the step of modulating the steam input based on the initial sludge temperature. This ensures that all sludge passing the heating point is at a temperature suitable for pasteurisation and is also energy
  • the steam is set to heat the sludge to 74°C, this allows for some hysteresis in the control loop and sludge cooling within the batch storage stage.
  • the sludge is returned for reheating if the temperature thereof is less than 70°C. More preferably the
  • sludge is stored for at least 30 minutes.
  • an apparatus for the treatment of sludge comprising a heating column through which sludge to be pasteurised may flow, the column having a steam input for the injection of low.pressure steam into the sludge
  • the apparatus may also comprise at least one holding tank in which the steam heated sludge is retained for a defined period of time and at a temperature suitable for pasteurisation.
  • sludge is maintained for an appropriate period of time to achieve pasteurisation.
  • the holding tank may be insulated. This helps maintain the sludge at the required temperature during the required holding time. Preferably, there is
  • the apparatus may comprise at least pne sensor which monitors the temperature of the sludge. This ensures that the sludge at a particular stage of the process is at the required temperature.
  • the apparatus comprises at least one return means for enabling the sludge to be returned for further heating if the sludge is not at the required temperature at a defined stage of the process.
  • the apparatus may include cooling means for reducing the temperature of the sludge to a temperature suitable for its further processing. This enables the apparatus to be readily retrofit to an existing sewage (digestive) treatment system. Sludge cooled to 35°C is suitable for MAD treatment.
  • Fig. 1 is a schematic view of an apparatus for treating sludge constructed in accordance with one embodiment of the present invention
  • Fig. 2 is a table showing effect of steam heating on sludge composition
  • Fig. 3 illustrates operational plots for a two-holding system constructed in accordance wjth the invention.
  • the apparatus for treating sludge comprises a steam heated column 2 into which raw sludge 4 is fed via a one-way valve 6.
  • the raw sludge 4 enters at the top of the column 2 via a sensor 8 which is connected to processing means (not illustrated) controlled by software.
  • the sensor 8 measures the temperature of the inflowing sludge and also its rate of flow. The use of these measurements is described further hereinunder.
  • a steam generator (not illustrated) comprising duel fuel burners and boiler feed water treatment plants capable of utilising final effluent injects steam at the base 10 of the column 2.
  • the steam temperature and rate of injection is controlled by the processor based on the sludge conditions measured by sensor 8 and the steam parameters are adapted to heat the sludge flowing down through the column 2 to 74°C.
  • the heated sludge is discharged at the base 12 of the column 2 where its temperature is measured by sensor 14. If the temperature of the sludge is less than 70°C the sludge is returned by control valve 16, 18 to the start of the process for re-heating. Pump 20 delivers sludge to holding thanks 22, 24, 26.
  • the sludge is feed to the insulated holding tanks 22, 24, 26 which are filled in sequence by control valve 28, 30, 32.
  • the discrete holding tanks 22, 24, 26 enable the
  • each tank controlled by their respective valves 28, 30, 32 sequentially in "fill”, "hold” and “discharge”, with normally one tank in each stage at any moment.
  • the residence capacity of each tank is set to at least
  • Sludge exiting the tanks 22, 24, 26 is passed via pump 40 to a heat recover system or heat exchanger 44, whilst sensor 42 measures the temperature of the sludge. If the measured temperature is less than 70°C
  • the sludge is returned to the start of the process for reheating.
  • the sludge passes through a pipe about which water is passed to cool the sludge to a temperature of around 35°C which is suitable
  • Steam is an efficient, in the order of 95% means of heat transfer into sludge.
  • the steam is injected at essentially atmospheric pressure and as
  • odorous off-gases are produced from the heating of the sludge are evolved from the column and by displacement. from the filing of the batch holding tanks.
  • This odorous air is treated with a 2 stage chemical scrubber.
  • the first stage provides chemical oxidation for the neutralisation of such compounds as hydrogen sulphide, organic sulphurs and organic amines, while the second stage is a chemical adsorbent for the
  • Sludge sampling points are provided on the cold, heated and
  • pasteurised sludge sample lines These are provided as part of good design practice as off-line sampling is not required or anticipated as part of normal operation. • As part of the present process verification, however, quantification of the following four key pathogen indicators has been undertaken: Faecal coliforms, total coliforms, faecal streptococci, and Salmonella.
  • the pathogen numbers are reduced to or below detectable levels.
  • Fig. 3 shows operational plots for a. 2 tank holding tank process.
  • Plot A shows the sludge temperature and flow into the heating column
  • Plot B shows the control of the heating system as vessel 1 fills followed by vessel 2. A period in the middle of the heating cycle is an idle period with sludge being recirculated without being fed forward into the holding vessels. This is a consequence of a 2 tank system.
  • Plot C shows the exit sludge temperature confirming that all sludge is above 70°C during discharge. This demonstrates that the process can be readily controlled and monitored to ensure the required time and

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • 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)
  • Treatment Of Sludge (AREA)

Abstract

Les boues brutes (4) à pasteuriser passent dans une colonne chauffante (2) où elles (4) sont chauffées par injection directe en ligne de vapeur (10) dans le flux de boues. La vapeur (10) peut s'injecter à contre-courant des boues (4).
PCT/GB2001/004877 2000-11-04 2001-11-02 Procede et appareil de traitement des boues WO2002036506A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002212485A AU2002212485A1 (en) 2000-11-04 2001-11-02 Method and apparatus for the treatment of sludge

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0027001.7 2000-11-04
GBGB0027001.7A GB0027001D0 (en) 2000-11-04 2000-11-04 Method and apparatus for the treatment of sludge

Publications (1)

Publication Number Publication Date
WO2002036506A1 true WO2002036506A1 (fr) 2002-05-10

Family

ID=9902576

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/004877 WO2002036506A1 (fr) 2000-11-04 2001-11-02 Procede et appareil de traitement des boues

Country Status (3)

Country Link
AU (1) AU2002212485A1 (fr)
GB (1) GB0027001D0 (fr)
WO (1) WO2002036506A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1604956A1 (fr) * 2003-09-04 2005-12-14 Libor Dlouhy-Dlouhy I.T.A. Installation pour l'assainissement thermique de boues
EP2612842A1 (fr) 2012-01-05 2013-07-10 CSL Carbon Solutions Ltd Appareil de chauffage de dépôt de biomasse
US9228132B2 (en) 2004-11-10 2016-01-05 SGC Advisors, LLC Slurry dewatering and conversion of biosolids to a renewable fuel
GB2496723B (en) * 2011-10-07 2016-07-13 Anglian Water Services Ltd Sludge treatment process

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1192848A (en) * 1967-11-30 1970-05-20 Metallgesellschaft Ag Process for Dewatering Sewage or Industrial Waste
DE2317673A1 (de) * 1973-04-07 1974-10-17 Roediger Fa Wilhelm Verfahren zum eindicken und entwaessern von klaerschlaemmen
JPS59136200A (ja) * 1983-01-26 1984-08-04 Nippon Kurea Kk 微生物を含む汚物等の処理方法及びその装置
US4668391A (en) * 1985-03-07 1987-05-26 Ottens Erroll P K Installation for dehydrating protein-containing sludge
US5785852A (en) * 1995-04-06 1998-07-28 Midwest Research Institute Pretreatment of high solid microbial sludges
WO2000034192A1 (fr) * 1998-12-08 2000-06-15 Riverside County Eastern Municipal Water District Pasteurisation d'un ecoulement continu de boues d'epuration
US6113789A (en) * 1998-07-20 2000-09-05 Western Environmental Engineering Company Pasteurization process

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1192848A (en) * 1967-11-30 1970-05-20 Metallgesellschaft Ag Process for Dewatering Sewage or Industrial Waste
DE2317673A1 (de) * 1973-04-07 1974-10-17 Roediger Fa Wilhelm Verfahren zum eindicken und entwaessern von klaerschlaemmen
JPS59136200A (ja) * 1983-01-26 1984-08-04 Nippon Kurea Kk 微生物を含む汚物等の処理方法及びその装置
US4668391A (en) * 1985-03-07 1987-05-26 Ottens Erroll P K Installation for dehydrating protein-containing sludge
US5785852A (en) * 1995-04-06 1998-07-28 Midwest Research Institute Pretreatment of high solid microbial sludges
US6113789A (en) * 1998-07-20 2000-09-05 Western Environmental Engineering Company Pasteurization process
WO2000034192A1 (fr) * 1998-12-08 2000-06-15 Riverside County Eastern Municipal Water District Pasteurisation d'un ecoulement continu de boues d'epuration

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 260 (C - 254) 29 November 1984 (1984-11-29) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1604956A1 (fr) * 2003-09-04 2005-12-14 Libor Dlouhy-Dlouhy I.T.A. Installation pour l'assainissement thermique de boues
US9228132B2 (en) 2004-11-10 2016-01-05 SGC Advisors, LLC Slurry dewatering and conversion of biosolids to a renewable fuel
USRE45869E1 (en) 2004-11-10 2016-01-26 SGC Advisors, LLC Slurry dewatering and conversion of biosolids to a renewable fuel
GB2496723B (en) * 2011-10-07 2016-07-13 Anglian Water Services Ltd Sludge treatment process
EP2612842A1 (fr) 2012-01-05 2013-07-10 CSL Carbon Solutions Ltd Appareil de chauffage de dépôt de biomasse
EP2615068A1 (fr) 2012-01-05 2013-07-17 CSL Carbon Solutions Ltd Appareil et procédé de préparation continue de dépôt de biomasse désintégré

Also Published As

Publication number Publication date
AU2002212485A1 (en) 2002-05-15
GB0027001D0 (en) 2000-12-20

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