WO1998018730A1 - Sludge dewatering control system - Google Patents
Sludge dewatering control system Download PDFInfo
- Publication number
- WO1998018730A1 WO1998018730A1 PCT/AU1997/000723 AU9700723W WO9818730A1 WO 1998018730 A1 WO1998018730 A1 WO 1998018730A1 AU 9700723 W AU9700723 W AU 9700723W WO 9818730 A1 WO9818730 A1 WO 9818730A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sludge
- dewatering
- additive
- particle structure
- control
- Prior art date
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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
Definitions
- sludge refers to substantially settled solid coagulated material derived from a treatment process.
- the sludge has added to it an additive for the purpose of improving the dewaterability behaviour of the sludge when processed through a dewatering device such as a centrifuge, belt press, filter press or the like.
- the dewatering device produces two outputs, namely dewatered sludge which is termed “cake” and the residual watery sludge driven from the cake which is termed a “watery stream” .
- the dewatering device is a centrifuge or cyclone the watery stream is also termed a "centrate”.
- the term “continuously monitoring the structure of the sludge” refers to a process of monitoring which is automatic and periodic in obtaining samples for processing.
- the method of control and the control system implementation of the method are “continuous” in the sense that whilst the taking of samples is a necessarily sequential process the total process of obtaining samples, analysing them and acting on the analysis will be continuous. Also the sampling will be performed at a sufficient rate to match with the control time constant required of the process.
- a method of control of dewatering of sludge comprising obtaining a relationship between particle structure and cake solids content of said sludge, continuously monitoring said particle structure of said sludge so as to provide a continuous determination of said cake solids content of said sludge and adding an additive to said sludge as a function of said cake solids content so as to control the dewatering characteristics of said sludge.
- said additive is a polymer.
- said sludge is sewage sludge.
- said sludge is a sludge and additive mix.
- said monitor utilises small angle light scattering (SALS ) equipment to determine said mass fractal dimension in conjunction with data processing means so as to effect control of the dewatering characteristics of said sludge.
- SALS small angle light scattering
- control is effected by reference to a predetermined relationship of additive dose against mass fractor dimension of said sludge.
- control is effected by reference to a predetermined relationship of cake solids content against fractor dimension of said sludge.
- particle structure is determined by obtaining a sample of said sludge after addition of said additive and before dewatering.
- a method of control of dewatering of sludge comprising obtaining a relationship between particle structure of said sludge and dewaterability of said sludge, monitoring said particle structure of said sludge so as to provide a determination of said dewaterability of said sludge and regulating the addition of an additive to said sludge in accordance with said relationship thereby to control the dewatering of said sludge.
- Fig 1. is a process diagram of a sludge dewatering control system according to a first embodiment of the invention and, Fig 2. is a graph of the relationship between sludge particle structure and cake solids content suitable for providing relationship data as an input to the control system of Fig 1, Fig 3. is a process diagram of a sludge dewatering control system according to a second embodiment of the invention, Fig 4. is a graph illustrating cake solids concentration against feed fractal dimension and centrate solids content against feed fractal dimension in relation to the system of Fig 3,
- Fig 5. is process diagram of a sludge dewatering control system according to a third embodiment of the invention
- Fig 6. is a graph of cake solids content against centrate fractal dimension and centrate solids content against centrate fractal dimension in relation to the system of Fig
- Fig 7. is a process diagram of a sludge dewatering control system implementing the system of Fig 5,
- Fig. 8 is a graph of the relationship between intensity of scattered light and momentum transfer from which fractal dimension can be calculated for the system of Fig 7,
- Fig 9 is a diagram of a combined dilution and small angle light scattering cell for use with the system of Fig 7 and
- Fig 10 is a flow diagram of a software implementation for use with the system of Fig 7, and
- Fig 11A is a graph of cake solids content against polymer content of an exemplary sludge and,
- Fig 11B is a graph of fractal dimension against polymer content for an exemplary sludge with polymer combination.
- Embodiments of the invention to be described rely on the combination of two key observations.
- cake solids content dewaterablility
- proportion of additive polymer
- fractal dimension can be used as a control variable to maximise cake solids content (dewaterability) around an optimal concentration of additive - in this instance polymer.
- FIG 1. A first preferred embodiment of the invention is illustrated in Fig 1. which comprises a flowchart of a control process for application to a sludge dewatering system.
- the dewatering system 10 includes a waste water treatment tank 11 wherein bacteria are present or a flocculant (not shown) is added to the waste water under treatment and which results in the formation of a sludge 12 which settles to the bottom of the tank 11 and which is removed via sludge outlet 13 for supply to a dewatering unit 14 via dewatering inlet 15.
- the dewatering unit can comprise a belt unit or a centrifuge unit or other known mechanism for the removal of water from sludge.
- the dewatered waste 16 is discharged from dewatering unit 14 via exit pipe 17 for transport by truck or similar to another site.
- the dewatering system 10 further includes a dosing device 18 which is adapted to add predetermined amounts of an additive 19 to the sludge 12 prior to dewatering by dewatering unit 14.
- the additive is a polymer of the type known to provide assistance in the improvement of dewatering characteristics of sludge 12.
- a control system 20 is applied to the dosing device 18 whereby the amount and timing of polymer dose administered by dosing device 18 is controlled by microprocessor or data processing device 21 in reliance upon input data 22 and relationship data 23.
- the relationship data 23 provides a mathematical relationship between solids content of sludge 12 and its structure, more particularly its structure as relevant to determining the dewatering characteristics of the sludge.
- the input data 22 is derived from a monitor which contiguously monitors the structure of the sludge 12 prior to processing by dewatering unit 14.
- the monitor is a small angle light scattering (SALS) unit 24 so as to provide a substantially continuous indication of the structure of the sludge 12 to data processing device 21.
- the data processing device 21 utilises this input data 22 in conjunction with the structure/solids content relationship derived via relationship monitor 25 to determine an estimate of the solids content of sludge 12 and thence to apply a control signal 26 to dosing device 18 so as to adjust the dose of polymer of like additive administered by dosing device 18 with the end result of controlling the dewaterability of the sludge entering dewatering unit 14.
- SALS small angle light scattering
- the dewatering unit can comprise a belt filter, or vacuum filter, or a centrifuge unit or other known mechanism for the removal of water from the sludge.
- the dewatered sludge cake 108 is discharged from the dewatering unit for further treatment or disposal as well as the watery stream 109 which is usually recycled.
- the relationship data 113 provides a relationship between sludge structure as relevant to determining the dewatering characteristics of the sludge.
- a sample 110 is taken of the mixed sludge and polymer stream 106 for analysis by the structure monitor.
- Figure 5 is a process diagram of a sludge dewatering control system according to a third embodiment of the invention and Figure 6 is a graph of the relationship between structure of the solids leaving the dewatering unit in the watery stream.
- the dewatering system includes a treatment tank 201 which results in the formation of a sludge 202 which is removed for supply to a dewatering unit 207.
- the dewatering unit can comprise a belt filter, or vacuum filter, or a centrifuge unit or other known mechanism for the removal of water from the sludge.
- the dewatered sludge cake 208 is discharged from the dewatering unit for further treatment or disposal as well as the watery stream 209 which is usually recycled.
- the dewatering system further includes a dosing device
- the additive is a polymer of the type know to provide assistance in the improvement of dewatering characteristics of sludge 202.
- the relationship data 213 provides a relationship between sludge structure as relevant to determining the dewatering characteristics of the sludge.
- the flow chart requires a comparison of the fractal dimension measurement obtained (dF) with the "inbuilt" dF v polymer dose relationship obtained from previous calibration tests.
- this relationship can also be a relationship of cake solids content versus fractal dimension of the sample as per Figs 2, 4 and 6 (permissible as the result of superposition of Figs 11A and 11B as described earlier in the specification).
- the embodiments of the invention can be applied to processes which dewater sludge so as to optimise additive addition. Such processes are found in water and waste water treatment plants, mineral processing plants and the like.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97909064A EP0946435A4 (en) | 1996-10-29 | 1997-10-29 | Sludge dewatering control system |
JP10519818A JP2001502601A (en) | 1996-10-29 | 1997-10-29 | Sludge removal control system |
AU46937/97A AU4693797A (en) | 1996-10-29 | 1997-10-29 | Sludge dewatering control system |
CA002270207A CA2270207A1 (en) | 1996-10-29 | 1997-10-29 | Sludge dewatering control system |
NO992070A NO992070L (en) | 1996-10-29 | 1999-04-29 | Sludge dewatering control system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPO3285A AUPO328596A0 (en) | 1996-10-29 | 1996-10-29 | Sludge dewatering control system |
AUPO3285 | 1996-10-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998018730A1 true WO1998018730A1 (en) | 1998-05-07 |
Family
ID=3797594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1997/000723 WO1998018730A1 (en) | 1996-10-29 | 1997-10-29 | Sludge dewatering control system |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0946435A4 (en) |
JP (1) | JP2001502601A (en) |
KR (1) | KR20000052923A (en) |
AU (1) | AUPO328596A0 (en) |
CA (1) | CA2270207A1 (en) |
NO (1) | NO992070L (en) |
WO (1) | WO1998018730A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002076890A2 (en) * | 2001-03-27 | 2002-10-03 | Clausthaler Umwelttechnikinstitut Gmbh (Cutec-Institut) | Method and measuring device for automatically determining the concentration factor of conditioned sewage sludge |
WO2020013698A1 (en) | 2018-07-13 | 2020-01-16 | Haskoningdhv Nederland B.V. | Method for dewatering watery biomass |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108693775A (en) * | 2018-05-24 | 2018-10-23 | 株洲时代新材料科技股份有限公司 | A kind of full-automatic, adaptive, ratio regulation and control sludge conditioning method |
CN112777918B (en) * | 2020-12-11 | 2022-08-12 | 北京林业大学 | Online control method for sludge oxidation conditioning based on fractal dimension and granularity |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0316997A2 (en) * | 1987-11-19 | 1989-05-24 | Calgon Corporation | System and method for monitoring and/or controlling liquidsolid separation processes |
AU3874193A (en) * | 1992-06-09 | 1993-12-16 | Anikem (Pty) Limited | Dewatering of slurries |
US5534139A (en) * | 1993-11-12 | 1996-07-09 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Apparatus for controlling solids-liquid separation |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3412620A1 (en) * | 1984-04-04 | 1985-10-17 | Basf Ag, 6700 Ludwigshafen | LASER OPTICAL ARRANGEMENT FOR MEASURING THE DEGREE OF DISPERSION IN FLOWING SYSTEMS |
CA1326079C (en) * | 1986-12-22 | 1994-01-11 | Walti Schmitt | Process for conditioning and dewatering sludges |
DE4029825A1 (en) * | 1990-09-20 | 1992-03-26 | Passavant Werke | METHOD AND DEVICE FOR CONDITIONING AND SUBSEQUENT DRAINAGE OF SLUDGE |
DE4442418A1 (en) * | 1994-11-29 | 1996-05-30 | Joachim Friedrich Knauer | Dosing unit for batch addn. of flocculant to aq. sludge from storage |
-
1996
- 1996-10-29 AU AUPO3285A patent/AUPO328596A0/en not_active Abandoned
-
1997
- 1997-10-29 JP JP10519818A patent/JP2001502601A/en active Pending
- 1997-10-29 CA CA002270207A patent/CA2270207A1/en not_active Abandoned
- 1997-10-29 EP EP97909064A patent/EP0946435A4/en not_active Withdrawn
- 1997-10-29 KR KR1019990703791A patent/KR20000052923A/en not_active Application Discontinuation
- 1997-10-29 WO PCT/AU1997/000723 patent/WO1998018730A1/en not_active Application Discontinuation
-
1999
- 1999-04-29 NO NO992070A patent/NO992070L/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0316997A2 (en) * | 1987-11-19 | 1989-05-24 | Calgon Corporation | System and method for monitoring and/or controlling liquidsolid separation processes |
AU3874193A (en) * | 1992-06-09 | 1993-12-16 | Anikem (Pty) Limited | Dewatering of slurries |
US5534139A (en) * | 1993-11-12 | 1996-07-09 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Apparatus for controlling solids-liquid separation |
US5626766A (en) * | 1993-11-12 | 1997-05-06 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Process for controlling solids-liquid separation |
Non-Patent Citations (1)
Title |
---|
See also references of EP0946435A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002076890A2 (en) * | 2001-03-27 | 2002-10-03 | Clausthaler Umwelttechnikinstitut Gmbh (Cutec-Institut) | Method and measuring device for automatically determining the concentration factor of conditioned sewage sludge |
WO2002076890A3 (en) * | 2001-03-27 | 2003-01-03 | Clausthaler Umwelttechnikinsti | Method and measuring device for automatically determining the concentration factor of conditioned sewage sludge |
WO2020013698A1 (en) | 2018-07-13 | 2020-01-16 | Haskoningdhv Nederland B.V. | Method for dewatering watery biomass |
NL2021302B1 (en) * | 2018-07-13 | 2020-01-20 | Haskoningdhv Nederland Bv | Method for dewatering watery biomass |
Also Published As
Publication number | Publication date |
---|---|
EP0946435A1 (en) | 1999-10-06 |
AUPO328596A0 (en) | 1996-11-21 |
NO992070D0 (en) | 1999-04-29 |
EP0946435A4 (en) | 2000-01-26 |
KR20000052923A (en) | 2000-08-25 |
NO992070L (en) | 1999-06-11 |
JP2001502601A (en) | 2001-02-27 |
CA2270207A1 (en) | 1998-05-07 |
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