WO2005100270A1 - Procede et systeme de traitement de boues d'epuration - Google Patents
Procede et systeme de traitement de boues d'epuration Download PDFInfo
- Publication number
- WO2005100270A1 WO2005100270A1 PCT/FR2005/000649 FR2005000649W WO2005100270A1 WO 2005100270 A1 WO2005100270 A1 WO 2005100270A1 FR 2005000649 W FR2005000649 W FR 2005000649W WO 2005100270 A1 WO2005100270 A1 WO 2005100270A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- solid
- filtration
- particles
- sludge
- type
- 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Definitions
- the present invention relates to a process for treating sewage sludge, that is to say sludge from the purification of waste water from communities or industries, as well as a system for treating said sludge for the implementation of said process.
- the sludge from wastewater treatment is liquid sludge with a dry matter content varying from 1 to 10%, with an average content generally around 3%.
- This sludge is usually treated by solid / liquid separation techniques making it possible to reject clarified liquid effluents on one side and dehydrated sludge with a dry matter content of at least 20% on the other relieIn order to promote separation solid / liquid, compounds such as flocculants are added to these sludges.
- the mixture is then dehydrated either by natural means on a drying bed or by freeze / thaw or by mechanical dehydration with filters.
- the dehydrated sludge is then landfilled or used as fertilizer in the agricultural sector, depending on the composition of this sludge.
- the latter path is now avoided due to the high content of these sludges in toxic metals and other contaminants.
- a European Directive of April 26, 1999 recommends avoiding the systematic dumping of this sludge, since it does not constitute an ultimate waste. The main remaining ways of recovery. of this sludge is therefore that of its elimination by incineration or landfill of the dry matter of this sludge.
- German patent DE 3,922,928 thus proposes a process for the dewatering of sewage sludge which consists in mixing sludge of industrial or urban origin with sewage sludge containing fibrous particles, especially from the paper or textile industries. Synthetic or organic flocculants are then added to the mixture, followed by filtration under pressure or vacuum of the previous mixture.
- the filter cakes obtained have a dryness of more than 40%, constitute a good fuel and produce little ash.
- This process which provides a solution to the problem of the recovery by incineration of this sewage sludge, however has a number of drawbacks. First of all, the humidity of the cake remains high and its combustion is therefore not optimal from an energy point of view.
- One of the aims of the present invention is therefore to overcome these drawbacks by proposing a simple, rapid, effective and economically advantageous solution for the treatment of sewage sludge with a view to its elimination by landfill or by incineration.
- a method for treating sewage sludge comprising a separation step by filtration remarkable in that said method comprises, prior to the separation step, a step of adding two types of solid fillers, each type of charge consisting of particles having a homogeneous average particle size, distinct from that of the particles constituting the other type of charge, in order to form an incompressible filtration matrix with high draining power and to obtain a filtration cake having a rate optimal dryness.
- the sludge used to develop the process according to the invention is sludge from an urban wastewater treatment plant having an initial dryness of 2%. These sludges are subjected to the treatment process according to the invention which comprises three main steps: a first step of adding solid charges, followed by a step of adding flocculants, which is followed by a step of filtration under pressure. According to an essential characteristic of the method according to the invention, the sludges from the purification treatment are collected in a tank and mixed with two types of solid charges. These solid charges consist of particles having a homogeneous average particle size, very distinct from that of particles of the other type of charge.
- r homogeneity of the particle size distribution of the particles of the filler used is essential for achieving good solid / liquid separation during filtration.
- This step of adding solid fillers to the sludge is carried out with vigorous stirring in order to ensure good dispersion of the solids.
- the first type of solid filler is called a coarse fraction and is made up of solid particles having an average particle size greater than that of the solid particles forming the second type of solid filler, called a fine fraction.
- the main function of the coarse fraction is to form an incompressible porous filtration matrix within the filter cake during the filtration step.
- the particles which can be used to form this coarse fraction may be, for example, calcium carbonate having an average diameter of more than 300 micrometers or alternatively, sand having an average diameter varying from 190 micrometers to 700 micrometers, for example.
- the other type of charge forming the fine fraction has the function, in addition to contributing to the constitution of the filtration matrix, to adsorb the particles of dry matter suspended in the mud.
- This fine fraction can, for example, consist of fine calcium carbonate, having an average diameter close to 20 micrometers, fine sand or else sawdust whose average diameter is of the order of 130 micrometers. It is understood that other types of particles can be used, the constraint being that the particles of the fine filler do not clog the pores of the filtration matrix.
- the dehycdratation yield is defined by the ratio of the amount of water recovered after filtration to the total amount of water in the treated sludge before filtration.
- the relative proportions of each of the solid charge fractions are of course variable depending on the initial dryness of the sludge, as well as the resources available in raw materials used in the constitution of these fractions.
- the dewatering yield varies between 94.00% and 94.7% for all associations between 50 and 100 g per kilo of sludge in a fine fraction of calcium carbonate with a coarse fraction of calcium carbonate varying between 200 and 350 g per kilo of mud.
- a dewatering yield greater than 92% was obtained with a proportion of calcium carbonate varying between 25 and 50 g per kilogram of mud and a proportion of sand varying between 130 and 200 g per kilo of mud.
- a dehydration yield greater than 95% was observed for combinations of sawdust and sand varying respectively between 10 and 25 g of sawdust per kilo of mud and 100 to 150 g of sand per kilo of mud.
- this solid / liquid separation is a pressure filtration, carried out in a specific device of the bladder filter-press type, the latter being actuated by the pressure of a fluid.
- a porous and non-compressible matrix will form within the filtration cake thanks to the association of coarse and fine fractions of solid charges, allowing effective drainage of the sludge water and avoiding clogging of the filter by particles of dry matter from the sludge.
- a filtration cake is thus obtained having a dryness of more than 60%, or even 80% under optimized conditions as shown with the examples of formulation given above. It is well understood that the value of the pressure applied will influence the dehydration yield. Thus, with the solid load formulations tested, it has been determined that the optimal pressure exerted on the bladder is between 30 and 60 bars. According to a last aspect of the process, it comprises an optional step of drying and disintegrating the filter cakes previously obtained, with separation of the constituents.
- This stage allows almost total recycling (losses ⁇ 2% by weight) of the solid fillers used and thus generates the landfill of "ultimate" waste consisting essentially (more than 80%) of dry matter particles from the sludge.
- this step of drying and separating the filter cakes is preferably based on the fluidized bed technique.
- the operating parameters can easily be optimized by the skilled person, depending on the residual moisture level of the cakes and the nature of the solid fillers used. Thus, tests carried out on filter cakes containing 70.6% of sand (fine and coarse fraction), 9.4% of dry matter particles of sludge and 20% of humidity have highlighted the importance of fluidization speed and temperature of the fluidizing air.
- This sludge treatment system therefore comprises a first charge dispersing reactor allowing the mixing of the purification sludge and two fractions of solid charges.
- the treatment system may include a tank for storing the sewage sludge as well as a storage tank for each of the two types of solid charges.
- the mixture is transferred by a pump to a flocculation reactor, which is also supplied with the flocculant coming from a preparation reactor for the latter.
- the mixture formed in the flocculation reactor is then transferred to the filtration device according to the invention.
- this filtration device 1 is composed of a metallic cylindrical grid 2 constituting the filter, the bottom 3 of which is removable so as to be able to extract the cake, for filtration once the filtration step has ended.
- the second end of the cylinder is closed by a cover 4 to which is attached on its internal face and co-axially to the cylinder 2 a sealed bladder 5.
- This bladder 5 is connected to a hydraulic group 6 making it possible to inject water under pressure in the bladder 5.
- the mixture from the flocculation reactor is therefore added to the filtration device 1 by a filling orifice 7 located at the top of the cylinder.
- the bladder 5 is then pressurized, which will press the mixture uniformly against the internal cylindrical wall of the filter and allow the evacuation of all the residual water which is not eliminated by the simple effect of gravity. This pressurizing step lasts a few minutes, usually one to two minutes.
- the bladder 5 is then deflated and the cake formed is recovered by removing the bottom 3 and extracting the cake by means of an appropriate tool, for example a metal rod or even a annular disc placed against the internal face of the cover 4 of the filtration device 1 and guided by a rod which is pushed down in the longitudinal direction of the filtration device H in order to unhook the filter cake.
- a combustible product is thus obtained comprising sewage sludge, advantageously in the form of a hollow cylinder which will facilitate its combustion.
- the internal structure of these filter cakes with large specific surface (m. 2 / kg) and with open porosity makes it possible to improve the dryness of the cake by simple natural convective drying.
- the landfill route is preferable, provided, however, that the bulk of the solid charges added for filtration can be recycled, making the cost of treatment of this sludge.
- the sludge treatment system may include a single-stage drying / separation assembly, with a fluidized bed.
- a device will be chosen whose design makes it possible to reinforce the dynamic mixing within the bed, so as to ensure a very thorough separation of the filter cakes introduced into the fluidized bed device (split upstream, at the feed device).
- a fluidization device with multiple jets of hot air will be installed, generating a strong localized turbulence, while allowing a moderate speed of the gas flow at the outlet (lower than the speed necessary for the flight of the sand).
- Such a drying / separation assembly allowing a continuous treatment of the filter cakes coming from the filter press will include: - a feed hopper with crumbling device, dosing screw and airlock, - a separator / dryer with a fluidized bed, - a fluidization air booster with variable speed motor, - an electric air heater (air temperature 200 ° C), - a cyclone with airlock, - a bag filter, - an activated carbon filter, - a fan centrifugal extraction with variable flow, - a damp air exhaust chimney, - an electrical installation / instrumentation unit with cabinet and autonomous control / command system.
- the sludge treatment system may include several filtration devices placed in parallel and operating intermittently, allowing an almost continuous treatment of the sludge with added solid charges and flocculants and feeding an incinerator or a set fluid bed drying / separator. It is also well understood that a person skilled in the art is able to establish the dimensioning of the treatment system as a function of the quantity of sewage sludge to be treated. Finally, it goes without saying that the sludge treatment process can be applied to any type of sewage sludge and that the examples of formulations of solid fillers that just given are only specific illustrations, in no way limiting the scope of the invention.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/592,705 US20080237150A1 (en) | 2004-03-17 | 2005-03-17 | Sewage Sludge Treatment Method and System |
EP05739455A EP1730083A1 (fr) | 2004-03-17 | 2005-03-17 | Procede et systeme de traitement de boues d'epuration |
CA2560189A CA2560189C (fr) | 2004-03-17 | 2005-03-17 | Procede et systeme de traitement de boues d'epuration |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0402758 | 2004-03-17 | ||
FR0402758A FR2867773B1 (fr) | 2004-03-17 | 2004-03-17 | Procede et systeme de traitement des boues d'epuration |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005100270A1 true WO2005100270A1 (fr) | 2005-10-27 |
Family
ID=34896596
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2005/000649 WO2005100270A1 (fr) | 2004-03-17 | 2005-03-17 | Procede et systeme de traitement de boues d'epuration |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080237150A1 (fr) |
EP (1) | EP1730083A1 (fr) |
CN (1) | CN1960950A (fr) |
CA (1) | CA2560189C (fr) |
FR (1) | FR2867773B1 (fr) |
WO (1) | WO2005100270A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ300446B6 (cs) * | 2007-04-27 | 2009-05-20 | Jihoceská univerzita v Ceských Budejovicích, Zemedelská fakulta | Zpusob zpracování železitých vodárenských kalu a smes pripravená tímto zpusobem |
CN103446800B (zh) * | 2013-08-30 | 2016-01-20 | 武汉和尔环保科技有限公司 | 一种污水处理器 |
CN104140171A (zh) * | 2014-08-05 | 2014-11-12 | 江苏睿济鼎诚科技工程有限公司 | 一种澄清超滤水处理装置 |
US10207945B2 (en) * | 2016-11-28 | 2019-02-19 | Zhengkui Bian | System for improving sludge water into ecological water system |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3276594A (en) * | 1962-09-24 | 1966-10-04 | English Clays Lovering Pochin | Filter presses |
JPS5759699A (en) * | 1980-09-25 | 1982-04-10 | Hitachi Plant Eng & Constr Co Ltd | Dewatering method for sludge |
FR2513239A1 (fr) * | 1981-09-24 | 1983-03-25 | Catry Jean Michel | Procede et dispositif pour la deshydratation partielle de boues ou analogues |
WO2000009454A1 (fr) * | 1998-08-14 | 2000-02-24 | Degremont | Dispositif de deshydratation des boues |
WO2001062679A1 (fr) * | 2000-02-22 | 2001-08-30 | Talc De Luzenac | Procede pour abaisser la resistance specifique a la filtration de boues biologiques provenant d'une station d'epuration d'eaux usees |
EP1234805A1 (fr) * | 2001-02-22 | 2002-08-28 | Hendrik Goossen | Procédé et dispositif de traitement des boues de dragage ainsi que les produits obtenus |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1364387A (en) * | 1917-01-11 | 1921-01-04 | Clarence P Landreth | Method of and apparatus for treating sewage |
US4244287A (en) * | 1979-07-09 | 1981-01-13 | Uop Inc. | Two-stage mechanical dewatering of sewage sludge |
JPS58180300A (ja) * | 1982-04-15 | 1983-10-21 | Hitachi Metals Ltd | 圧搾脱水用汚泥粒 |
US5160440A (en) * | 1986-10-29 | 1992-11-03 | Josef Merai | Procedure for the dewatering of sewage sludge and plant for procedure execution |
US5431702A (en) * | 1993-03-25 | 1995-07-11 | Dynecology, Inc. | Waste conversion process and products |
DE19900187C1 (de) * | 1999-01-06 | 2000-06-15 | Stockhausen Chem Fab Gmbh | Verfahren zur Entwässerung von Klärschlämmen mit Plattenfiltern (Filterpressen) |
-
2004
- 2004-03-17 FR FR0402758A patent/FR2867773B1/fr not_active Expired - Fee Related
-
2005
- 2005-03-17 CA CA2560189A patent/CA2560189C/fr not_active Expired - Fee Related
- 2005-03-17 CN CNA2005800086232A patent/CN1960950A/zh active Pending
- 2005-03-17 EP EP05739455A patent/EP1730083A1/fr not_active Withdrawn
- 2005-03-17 US US10/592,705 patent/US20080237150A1/en not_active Abandoned
- 2005-03-17 WO PCT/FR2005/000649 patent/WO2005100270A1/fr active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3276594A (en) * | 1962-09-24 | 1966-10-04 | English Clays Lovering Pochin | Filter presses |
JPS5759699A (en) * | 1980-09-25 | 1982-04-10 | Hitachi Plant Eng & Constr Co Ltd | Dewatering method for sludge |
FR2513239A1 (fr) * | 1981-09-24 | 1983-03-25 | Catry Jean Michel | Procede et dispositif pour la deshydratation partielle de boues ou analogues |
WO2000009454A1 (fr) * | 1998-08-14 | 2000-02-24 | Degremont | Dispositif de deshydratation des boues |
WO2001062679A1 (fr) * | 2000-02-22 | 2001-08-30 | Talc De Luzenac | Procede pour abaisser la resistance specifique a la filtration de boues biologiques provenant d'une station d'epuration d'eaux usees |
EP1234805A1 (fr) * | 2001-02-22 | 2002-08-28 | Hendrik Goossen | Procédé et dispositif de traitement des boues de dragage ainsi que les produits obtenus |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 0061, no. 35 (C - 115) 22 July 1982 (1982-07-22) * |
Also Published As
Publication number | Publication date |
---|---|
US20080237150A1 (en) | 2008-10-02 |
FR2867773B1 (fr) | 2006-12-22 |
CA2560189C (fr) | 2011-07-05 |
EP1730083A1 (fr) | 2006-12-13 |
FR2867773A1 (fr) | 2005-09-23 |
CA2560189A1 (fr) | 2005-10-27 |
CN1960950A (zh) | 2007-05-09 |
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