WO2007110547A2 - Procede d'obtention d'un produit coagulant, produit destine a fabriquer ledit coagulant et procede de traitement des eaux usees et/ou industrielles utilisant ledit coagulant. - Google Patents
Procede d'obtention d'un produit coagulant, produit destine a fabriquer ledit coagulant et procede de traitement des eaux usees et/ou industrielles utilisant ledit coagulant. Download PDFInfo
- Publication number
- WO2007110547A2 WO2007110547A2 PCT/FR2007/051020 FR2007051020W WO2007110547A2 WO 2007110547 A2 WO2007110547 A2 WO 2007110547A2 FR 2007051020 W FR2007051020 W FR 2007051020W WO 2007110547 A2 WO2007110547 A2 WO 2007110547A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coagulant
- raw material
- aluminum
- salts
- sludge
- 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
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Definitions
- the invention relates to a process for obtaining a coagulant product which can be used in particular for the treatment of wastewater whether urban and / or industrial wastewater.
- a dephosphatation step is carried out, in particular a physico-chemical dephosphatation.
- precipitation is carried out with lime or with salts containing trivalent ions, in particular using iron or aluminum chloride.
- it is almost exclusively ferric chloride FeCb that is used in large quantities in this stage of physico-chemical dephosphatation.
- FeCb ferric chloride
- the present invention aims to provide a method for overcoming the disadvantages of the prior art and in particular offering the possibility of using the drinking water sludge as a source of iron or aluminum salts to form a coagulant whose quality, and more particularly the content of iron and / or aluminum salts, allows it to be used in the treatment of wastewater, while having a form compatible with an economically viable transport cost.
- a process for obtaining a coagulant product which is characterized in that a raw material is prepared containing sludge resulting from the treatment of drinking water (settling soil ), said sludge being enriched by an ore containing iron and / or aluminum, this raw material being subjected to an acid etching to form iron salts, aluminum salts or their mixture, in the form of simple salts and / or compound salts.
- a process for obtaining a coagulant product which, compared to the prior art according to which sludge resulting from the treatment of drinking water is prepared, is then subjected to an acid attack. by heating, then filtered, is distinguished by the fact that is first of all the enrichment of the drinking water sludge by Fe 3+ and / or Al 3+ ions.
- the drinking water sludge is doped with iron and / or aluminum at the desired height depending on the desired final content.
- iron and / or aluminum in the coagulant can not only be achieved by iron ore and / or aluminum but also by the addition of one of these two metals.
- This solution also has the additional advantage of allowing, in addition to an economy of ore compared to the process of traditional manufacture of a coagulant, also to find an outlet for drinking water sludge that is valued.
- the process advantageously comprises the following steps: a) an initial mixture is made between the sludge resulting from the treatment of drinking water and the powder of an ore containing iron and / or aluminum, by which one dope the mud; b) the initial mixture is dehydrated to form a raw material (for example in the form of a cake or granules); c) an acid attack is carried out, with initial heating, of the raw material with a mineral acid, whereby an intermediate product containing iron salts, aluminum salts or their mixture is formed, and d) is produced filtration of the intermediate product in order to separate the solid phase from the liquid phase containing said coagulant product.
- the solution according to the present invention it is possible to obtain, from mud of drinking water and iron ore and / or aluminum, a dehydrated raw material having sufficient dryness , with a view to its transport.
- the final stage of the coagulant production process namely the recovery phase - generation (steps c) and d) of acid etching and filtration, is advantageously carried out at the user site, namely mainly a treatment plant, or on a dedicated site for this purpose.
- the user site namely mainly a treatment plant, or on a dedicated site for this purpose.
- the process advantageously comprises the following steps: a ') is added powder of a mineral containing iron and / or aluminum during the step of clarification of the drinking water treatment, whereby an initial mixture is obtained; b) the initial mixture is dehydrated to form a raw material; c) an acid attack is carried out, with initial heating, of the raw material with a mineral acid, whereby an intermediate product containing iron salts, aluminum salts or their mixing, and d) filtering the intermediate product to separate the solid phase from the liquid phase containing said coagulant product
- step a) then becomes step a ') which occurs during the clarification (coagulation - flocculation - decantation) of the water.
- the ore containing iron and / or aluminum serves to support the flocs during the clarification so as to recover a sludge doped with active material and promote the settling and removal of suspended solids and organic matter.
- the ore prior to step a), the ore is charged, preferably by means of an ionic polyelectrolyte (cationic or anionic) or nonionic, serving as a flocculating agent for the ore. Loading the ore improves its capabilities as a structuring agent for step b) dehydration.
- This loading may also include the introduction of lime, although less than for a conventional step of preparation for the dewatering of drinking water sludge.
- step c) acid etching is carried out using hydrochloric acid or sulfuric acid, but it should be noted that the use of any mineral acid may be suitable.
- the dehydration step b it is preferably carried out by means of a filter press and / or a membrane filter press.
- a filter press and / or a membrane filter press In this case, not implementing dehydration with lime, which is conventionally used in the treatment of drinking water sludge, in particular to achieve a calcium amendment, this raw material is saved.
- the structuring role played by the lime during the dehydration stage of a conventional treatment of drinking water sludge is in the case of the invention played by the ore which is advantageously charged, in particular by a polyelectrolyte.
- the process further comprises, after the dehydration step b), a dehydration step complementary to the raw material by drying, filter press and / or filter membrane press.
- the present invention relates to the coagulant resulting from this manufacturing process and derived from both iron ore and / or aluminum and drinking water sludge.
- the present invention relates to a product for obtaining a coagulant for the treatment of wastewater and / or industrial waste, comprising sludge resulting from a drinking water treatment plant enriched by an ore containing iron and / or aluminum.
- this product also comprises a polyelectrolyte, ionic (cationic or anionic) or nonionic, serving as a flocculating agent for the ore.
- a polyelectrolyte ionic (cationic or anionic) or nonionic, serving as a flocculating agent for the ore.
- This electrolyte achieves a loading of the ore, which makes it possible to improve its capacities as a structuring agent for the dehydration stage.
- Such a product may correspond to the initial mixture (mud doped) formed of the sludge resulting from the treatment of drinking water and which has been doped with the ore containing Fe 3+ and / or Al 3+ ions, or else this product may correspond to the dehydrated doped sludge forming, at the end of the dehydration step, the abovementioned raw material.
- this product has a dryness greater than 25% by weight, the dryness of this product being preferably between 35 and 90% by weight.
- a dryness sufficiently important to be compatible with the requirements of transport is obtained especially when this product is formed of the raw material resulting from steps a) and b) (doping of the sludge by the ore and dehydration), before the implementation of the steps c) and d) (acid etching and filtration) of the aforementioned process.
- the present invention relates to a wastewater treatment process and / or industrial, comprising a physico-chemical step using a coagulant, characterized in that said coagulant comprises comprises a mineral electrolyte based on trivalent ion resulting at least partially from sludge of the drinking water treatment sector, said sludge being enriched by an ore containing iron and / or aluminum.
- said coagulant comprises one or more salts, simple or compounds, from the group consisting of iron salts and aluminum salts.
- said physico-chemical step is a physico-chemical dephosphatation, a coagulation, a dehydration step, decarbonation or emulsion breaking.
- the coagulant manufactured according to the invention from the mixture of drinking water sludge and ore, in particular iron ore and / or aluminum, can find many opportunities in the field of water treatment.
- This coagulant may also find uses in other fields, such as as a binder for the manufacture of concrete, or for the manufacture of paper in the chemistry of the wet part of the machine.
- Other advantages and characteristics of the invention will become apparent on reading the following description given by way of example and with reference to the single figure which shows a block diagram of one embodiment of the method according to the invention.
- ore containing Al 3+ aluminum ions and / or Fe 3+ iron ions is mixed with drinking water sludge from the treatment of drinking water, and then the initial mixture formed of this doped sludge is obtained.
- a polymer serving as polyelectrolyte is added to the iron ore and / or aluminum a polymer serving as polyelectrolyte to load the ore.
- This polyelectrolyte can be ionic (cationic or anionic) or nonionic. In this way, the charged ore is thus more suited to serve as structuring of the drinking water sludge for the subsequent dehydration phase.
- the initial mixture or doped sludge results in two new products formed of the liquid part, in the form of a filtrate, and of the solid part in the form of a dehydrated doped sludge called raw material (cake or granules).
- the coagulant is formed by two successive stages: acid etching and filtration.
- an excess of mineral acid is added to the dehydrated doped sludge, the whole being heated to a temperature of about 80 ° C. for several hours.
- water vapor escapes from the vessel containing the reactive medium and the reaction of the acid with iron ions or aluminum ions results in the formation of iron and / or aluminum salts.
- Any mineral acid may be suitable such as hydrochloric acid, sulfuric acid or phosphoric acid.
- the reactive material which is formed at the end of the acid attack forms an intermediate product.
- this polymer may undergo partial hydrolysis: the residual content of the polyelectrolyte will advantageously promote by flocculation better dehydration of the intermediate product during the subsequent filtration step.
- a filter press is preferably used, possibly combined with a membrane-type plate press filter.
- separation of the solid phase, constituting a residue, from the liquid phase which has been recovered in order to constitute the coagulant is performed by the presence of the iron salts and / or aluminum (aluminum or iron chloride, aluminum sulphate Al 2 (SO 4 ) 3 or iron sulphate if sulfuric acid is used in the acid attack stage).
- the acid used can itself come from an industrial residue such as a pickling bath.
- This liquid can serve as a coagulant in all conventional applications, including in particular the realization of a physicochemical stage of wastewater treatment and / or industrial such as a physico-chemical dephosphatation.
- a precipitation of the phosphorus by Al 3+ or Fe 3+ ions is carried out in order to form the AIPO 4 or FePO 4 salts, although they are very slightly soluble, they precipitate in the colloidal state, this precipitate being subsequently eliminated by flocculation on an excess of metal hydroxide.
- this coagulant in a coagulation step (for example for to improve a subsequent decantation stage of a liquid), a dehydration step, a carbonation step, an emulsion breaking or coagulation stage, whether this is carried out for the treatment of wastewater and / or industrial effluents or in other applications.
- a quantitative example of embodiment of the process according to the present invention will now be presented.
- the ore is loaded by means of a polymer of the polyelectrolyte type.
- a polymer of the polyelectrolyte type there is 2 grams per liter of active anionic polymer, in a volume of 1575 I which corresponds to a total of 3.115 kg of dry matter.
- the ore thus charged is then mixed with 6348.4 l of mud from a drinking water plant in the south of the Paris region, which contains 0.061 kg of aluminum per kilogram of dry matter and 41.35 g of dry matter. per liter, which corresponds to a total of 262.5 kg of dry matter comprising 16 kg of aluminum.
- the dewatering phase of the doped sludge is carried out by means of a filter press.
- the stack of successive layers of doped sludge is carried out between the interval formed between each pair of two plates of the filter press, which is pressurized up to 15 bar.
- the result is a recovery yield of 88.7% of aluminum.
- the tests showed a recovery efficiency of more than 85% for aluminum and more than 95% for iron.
- this method has the particular advantage of making it possible to obtain the same quantity of coagulant from a lesser amount starting material, namely in the first case of drinking water sludge and in the second case the initial mixture (ore-doped sludge), which in particular reduces the volumes of material transported and treated. Also, by the ore doping, one can obtain a coagulant whose content of iron and / or aluminum salts is increased to the desired value.
- the method according to the invention has the particular advantage of using less ore, thus allowing the savings in the purchase and transport of ore.
- This process also makes it possible to find an outlet as a useful material for drinking water sludge that is normally considered as waste and to produce a coagulant salt that can be used in the wastewater treatment stream, thereby limiting the volumes of sludge generally produced. by the two sectors in an extraordinary way.
- the drinking water sludge collected throughout the Ile de France contains a quantity of trivalent salts that can cover alone about 70 to 80% of the sanitation needs for treatment plants of the same territory.
- the raw material resulting from the dehydration state is transported to the final place of manufacture of the coagulant which may be the purification plant that will need of this coagulant during the wastewater treatment stages.
- the manufacture of the coagulant may be the purification plant that will need of this coagulant during the wastewater treatment stages.
- this site will be able to centralize the recovery of dehydrated doped sludge or raw materials from different drinking treatment plants in order to carry out the third and last phase of the coagulant manufacturing process.
- inorganic coagulant in particular aluminum chloride, alumina sulphate, iron chloride or sulphate, PAC and PACS or else mixed salts of iron and / or aluminum.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/294,764 US20100163486A1 (en) | 2006-03-27 | 2007-03-27 | Method of obtaining a coagulant product, product intended to produce said coagulant, and method of treating waste water and/or industrial water using said coagulant |
CA2647410A CA2647410C (fr) | 2006-03-27 | 2007-03-27 | Procede d'obtention d'un produit coagulant, produit destine a fabriquer ledit coagulant et procede de traitement des eaux usees et/ou industrielles utilisant ledit coagulant |
CN2007800144627A CN101426735B (zh) | 2006-03-27 | 2007-03-27 | 混凝剂产品及其制造方法和使用该混凝剂产品处理污水和/或工业污水的方法 |
EP07731830A EP1999074A2 (fr) | 2006-03-27 | 2007-03-27 | Procede d'obtention d'un produit coagulant, produit destine a fabriquer ledit coagulant et procede de traitement des eaux usees et/ou industrielles utilisant ledit coagulant |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0651042 | 2006-03-27 | ||
FR0651042A FR2898889B1 (fr) | 2006-03-27 | 2006-03-27 | Procede d'obtention d'un produit coagulant, produit destine a fabriquer ledit coagulant et procede de traitement des eaux usees et/ou industrielles utilisant ledit coagulant |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2007110547A2 true WO2007110547A2 (fr) | 2007-10-04 |
WO2007110547A3 WO2007110547A3 (fr) | 2007-11-29 |
Family
ID=37579132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2007/051020 WO2007110547A2 (fr) | 2006-03-27 | 2007-03-27 | Procede d'obtention d'un produit coagulant, produit destine a fabriquer ledit coagulant et procede de traitement des eaux usees et/ou industrielles utilisant ledit coagulant. |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100163486A1 (fr) |
EP (1) | EP1999074A2 (fr) |
CN (1) | CN101426735B (fr) |
CA (1) | CA2647410C (fr) |
FR (1) | FR2898889B1 (fr) |
WO (1) | WO2007110547A2 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102079563B (zh) * | 2010-12-21 | 2012-07-25 | 东华大学 | 一种可再生的混凝剂及其制备和使用方法 |
CN103833060B (zh) * | 2014-03-24 | 2016-03-30 | 南通科纯化工有限公司 | 一种纯清聚合氯化铝的生产方法 |
US9738542B2 (en) * | 2014-12-09 | 2017-08-22 | Kronos International, Inc. | Method for the further processing of iron sulfate heptahydrate |
SE539935C2 (sv) * | 2016-06-16 | 2018-01-30 | Hans Ulmert Med Firma Flocell | Metod för återvinning av koagulanter ur kemslam från vatten-och avloppsverk |
CN106590689B (zh) * | 2016-12-26 | 2018-06-19 | 荆门市格林美新材料有限公司 | 从不同污泥中回收铝镁制备复合阻燃剂的方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995000446A1 (fr) * | 1993-06-17 | 1995-01-05 | Kemira Chemicals Oy | Methode de traitement des boues issues du traitement des eaux |
JPH0824515A (ja) * | 1994-07-11 | 1996-01-30 | Japan Organo Co Ltd | 凝集沈澱処理法及びその設備 |
US20020179531A1 (en) * | 2001-03-21 | 2002-12-05 | Sengupta Arup K. | Process for selective coagulant recovery from water treatment plant sludge |
WO2005037714A1 (fr) * | 2003-10-17 | 2005-04-28 | Feralco Ab | Procede de traitement des boues |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3142638A (en) * | 1962-06-29 | 1964-07-28 | Blaisdell Donald Stapf | Process for separating solids from sewage |
US3627679A (en) * | 1967-05-25 | 1971-12-14 | Gulf States Paper Corp | Effluent treatment processes |
US4024087A (en) * | 1975-11-06 | 1977-05-17 | Jury Abramovich Lainer | Method of preparing coagulant for purification of water from mechanical admixtures |
US4279756A (en) * | 1976-05-03 | 1981-07-21 | Commonwealth Scientific And Industrial Research Organization | Water clarification |
FI79031C (fi) * | 1988-08-03 | 1989-11-10 | Larox Ag | Filtreringsfoerfarande. |
US5073272A (en) * | 1988-11-15 | 1991-12-17 | Aluminum Company Of America | Method for using a flocculant powder |
DE60002011T2 (de) * | 1999-07-08 | 2004-01-29 | Taki Chemical | Verfahren zur Herstellung einer wässrigen Eisen(III)-Sulfat-Lösung und ihre Verwendung als Wasserbehandlungsreagenz |
-
2006
- 2006-03-27 FR FR0651042A patent/FR2898889B1/fr active Active
-
2007
- 2007-03-27 WO PCT/FR2007/051020 patent/WO2007110547A2/fr active Application Filing
- 2007-03-27 EP EP07731830A patent/EP1999074A2/fr not_active Withdrawn
- 2007-03-27 CN CN2007800144627A patent/CN101426735B/zh not_active Expired - Fee Related
- 2007-03-27 CA CA2647410A patent/CA2647410C/fr not_active Expired - Fee Related
- 2007-03-27 US US12/294,764 patent/US20100163486A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995000446A1 (fr) * | 1993-06-17 | 1995-01-05 | Kemira Chemicals Oy | Methode de traitement des boues issues du traitement des eaux |
JPH0824515A (ja) * | 1994-07-11 | 1996-01-30 | Japan Organo Co Ltd | 凝集沈澱処理法及びその設備 |
US20020179531A1 (en) * | 2001-03-21 | 2002-12-05 | Sengupta Arup K. | Process for selective coagulant recovery from water treatment plant sludge |
WO2005037714A1 (fr) * | 2003-10-17 | 2005-04-28 | Feralco Ab | Procede de traitement des boues |
Non-Patent Citations (1)
Title |
---|
LINDSEY E E ET AL: "RECOVERY AND REUSE OF ALUM FROM WATER FILTRATION PLANT SLUDGE BY ULTRAFILTRATION" AICHE SYMPOSIUM SERIES, AMERICAN INSTITUTE OF CHEMICAL ENGINEERS, NEW YORK, NY, US, vol. 71, no. 151, 1975, pages 185-192, XP009072020 ISSN: 0065-8812 * |
Also Published As
Publication number | Publication date |
---|---|
US20100163486A1 (en) | 2010-07-01 |
FR2898889B1 (fr) | 2008-09-05 |
CN101426735B (zh) | 2011-11-30 |
CA2647410A1 (fr) | 2007-10-04 |
WO2007110547A3 (fr) | 2007-11-29 |
CN101426735A (zh) | 2009-05-06 |
CA2647410C (fr) | 2014-06-03 |
FR2898889A1 (fr) | 2007-09-28 |
EP1999074A2 (fr) | 2008-12-10 |
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