EP4389288A1 - Method for managing inert waste of construction site and construction site - Google Patents
Method for managing inert waste of construction site and construction site Download PDFInfo
- Publication number
- EP4389288A1 EP4389288A1 EP23218457.2A EP23218457A EP4389288A1 EP 4389288 A1 EP4389288 A1 EP 4389288A1 EP 23218457 A EP23218457 A EP 23218457A EP 4389288 A1 EP4389288 A1 EP 4389288A1
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- EP
- European Patent Office
- Prior art keywords
- waste
- land
- inert
- water
- collection
- Prior art date
- Legal status (The legal status 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 status listed.)
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- 239000010804 inert waste Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000002699 waste material Substances 0.000 claims abstract description 32
- 238000005406 washing Methods 0.000 claims abstract description 26
- 238000012216 screening Methods 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 239000007790 solid phase Substances 0.000 claims abstract description 11
- 239000002351 wastewater Substances 0.000 claims abstract description 10
- 239000008346 aqueous phase Substances 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract description 3
- 239000004567 concrete Substances 0.000 claims description 49
- 239000002689 soil Substances 0.000 claims description 17
- 239000004575 stone Substances 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 13
- 238000007726 management method Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- 239000002671 adjuvant Substances 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 239000010812 mixed waste Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000003923 scrap metal Substances 0.000 claims description 5
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 229920000914 Metallic fiber Polymers 0.000 claims description 3
- 239000000049 pigment Substances 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 229920002994 synthetic fiber Polymers 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 description 16
- 239000012615 aggregate Substances 0.000 description 14
- 238000009434 installation Methods 0.000 description 11
- 239000012071 phase Substances 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 238000010169 landfilling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 238000006424 Flood reaction Methods 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 241001125843 Trichiuridae Species 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
- B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
- B03B9/065—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial the refuse being building rubble
Definitions
- the present invention relates to a process for managing inert waste and land from construction sites.
- the aim of the invention is to provide a method for managing inert construction site waste and land from construction sites in a manner which allows a revaluation of several of these wastes and land, a reduction in their transport costs, and an exploitation to several of them on site near their treatment and storage with simultaneously additional water management which makes it possible to avoid consumption of water from the distribution network and environmental pollution as much as possible.
- the third treatment area is provided with at least one mixer in which water, aggregates and various adjuvants are mixed with a hydraulic binder depending on the concrete to be produced. Aggregates, such as sand, chippings, gravel and gravel of various particle sizes are produced here inside the plant and can therefore be consumed directly for the production of concrete in the plant itself.
- Concrete manufacturing facilities are used to provide products of several types, such as concrete meeting the specifications of the Bénor brand or rich concretes called "on composition", lean concretes, or various cement-based mixtures. and aggregates such as stabilized stones, stabilized sands, Rhine sand screeds, specific concretes (road, cavernous, etc.). Special adjuvants are sometimes requested.
- Said other concrete production components include, for example, pigments, synthetic or metallic fibers, various adjuvants or their mixture. Increasingly, it is sought to be able to recycle certain materials already previously used in concrete. According to the invention, these materials are therefore already available on site and do not require expensive transport costs for their reuse in the mixers.
- the land obtained by the pre-screening of certain inert earthy waste can immediately be transferred to the land treatment area without requiring costly transport costs.
- the production and consumption of concrete result in high water consumption, on the one hand for the production of the concrete itself and on the other hand for washing the mixing tools and transport tools.
- transport tools we mean the tanks, pumps, pipes or trucks which are used to transport concrete and products assimilated towards their destination of use.
- wastewater consists mainly of washing water from the installation's mixers and from the inside of the tanks of the mixer trucks transporting the concrete produced to their operating site. These wash waters contain residual aggregates as well as fresh concrete residues. This wastewater cannot therefore be discharged as it is into nature.
- the invention not only is the basic liquid phase (pH of the order of 11-13) of the wastewater reused as is, but the solid waste from mixing is also recovered on site by returning to the first treatment area where The collection of the inert waste management process takes place.
- At least the natural drying step is carried out sheltered from the rain under a roof covering which allows rainwater to be collected.
- This rainwater makes it possible to introduce fresh water into the process water circuit, which makes it possible to compensate, with the recycled basic aqueous phase, the consumption of water used to react, for example with a hydraulic binder during the manufacture of concrete.
- said rainwater can advantageously be collected in a retention basin before its use.
- Rainwater collected regularly during each downpour, in particular using the cover sheltering the soil stored for its natural drying therefore represents a significant addition which makes it possible to avoid an external water supply as much as possible.
- the shelter provided to the land stored for drying also prevents rainwater from percolating through this land, then eventually become contaminated in the ground or even the water table.
- the land brought to the natural drying stage under cover can be very humid. Possibly contaminated water, called leachate water, then percolates through them.
- the method according to the invention comprises a separate collection of leachate water coming from wetlands in the process of drying, advantageously with a view to allowing their analysis, and this to prevent the penetration of this water into the ground or even the water table.
- the clean inert waste is classified as concrete waste, tarmac or hydrocarbon waste, mixed waste and natural stone, each of these wastes being able to independently undergo the crushing and screening stages.
- clean inert waste can be obtained having several particle sizes, corresponding or not to current standards, for example 0/80, 0/63, 31.5/63, 63/150, 0/20, 0/6.3, 6.3/ 20 etc., which will then be used independently depending on the finished product to be produced.
- These values define the mesh openings of the sieves used to produce the particle sizes and are to be expressed in mm.
- the step of crushing the clean inert waste before the step of crushing the clean inert waste, it comprises an isolation of reinforced concrete waste from which scrap metal is separated then stored with a view to departure, by example to a scrap metal dealer or a steelworks.
- the step of separating the washing water consists of decanting this water in a decanting basin, drawing off the supernatant aqueous phase and extracting the decanted solid phase. formed from said recovered aggregates and fresh concrete residue.
- the withdrawal can be carried out by any means known for this purpose, for example by pumping or using an overflow.
- the extraction of the solid phase can be envisaged for example by an Archimedes screw or by dredging using a bulldozer. Any other known means of separation can obviously also be considered, such as filtration.
- waves of dust may be carried by the wind from inert waste stored in the first treatment area.
- it can be planned to spread rainwater on the dusty roads of the treatment areas, in particular between the first and second treatment areas, in particular using a towed tank filled with with the help of rainwater collected by said shelter cover.
- inert waste 1 from deconstruction sites or certain earthworks sites, for example containing a lot of natural stones, is entered in a classified manner in the treatment area 2. It is thus possible, for example, to pile up separately, in the space of collection 5, concrete waste, tarmac waste, mixed waste such as bricks or plastics, and stones, provided they contain less 10% of land. These wastes are called clean waste.
- Earthy waste containing more than 10% and up to a maximum of 50% by weight of soil is transferred and pre-screened in a pre-screening step 3.
- the passage formed from the pre-screened soil is then, following arrow F1, evacuated by truck or simply by bulldozer to the nearby processing area 4 which is intended for the management of earthworks sites.
- the waste retained during pre-screening and therefore freed from soil is returned to the corresponding clean waste piles in collection space 5.
- Each of the crushed waste is then passed through one or more successive screens 7, with a view to calibrating them and/or separating different particle size fractions such as those already mentioned previously.
- the installation illustrated on the figure 1 comprises at least one concrete plant intended to produce various concretes and similar products such as stabilized sands, stabilized stones, etc.
- the plant includes at least one mixer 10 which must be supplied with several incoming components 11, in particular at least one hydraulic binder, water and aggregates, stones or sand.
- These concretes will require, depending on their destination or quality, the use of aggregates, stones or sand of various particle sizes. appropriate.
- These, in the process according to the invention can be taken, at the appropriate size, from the calibrated inert waste piled up in 7 on the treatment area 2, as illustrated by arrow F2.
- Some of these aggregates, stones or sand calibrated in 7 can also be directed to the starting products 8 for their use in external installations.
- incoming components 11 can be provided for mixing concrete, such as pigments, synthetic or metallic fibers, various adjuvants, etc. Aggregates of origin external to the installation according to the invention can also be considered as input components 11.
- the starting products 12 usually from a concrete plant which are then removed or delivered outside.
- this washing step is represented generally by block 13 where washing water, introduced into the plant as incoming component 11, is used for this purpose.
- the washing wastewater 14 from this step is collected and discharged into a settling basin 15.
- the supernatant liquid phase having a pH of 11-13 is extracted for example by an overflow system and, following the invention, it is recycled as is, following arrow F3, among the incoming components 11 of the power plant.
- a decanted solid phase is regularly extracted from the settling basin 15, for example by an Archimedes screw, and piled up in 16. This solid phase is formed of recovered aggregates and fresh concrete which have not been carried away in the mass.
- these recovered aggregates and these fresh concrete residues piled up at 16 are returned along the arrow F4, to the treatment area 2, in particular to the collection space 5, in particular to the pile of inert waste which corresponds to them, that is to say concrete waste.
- the dangers of pollution of the environment or the water table at the outlet of the concrete plant are avoided since all the usual liquid or solid residues are reused.
- the incoming products 17 brought to the processing area 4 are mainly earth from earthworks sites.
- certain lands are refused because they are non-compliant or do not correspond to various administrative standards. Land that can still be considered arable is separated.
- Reference 18 represents all the starting products, that is to say leaving the installation from the treatment area 4 in particular for outdoor operation. Arable land is therefore one of these products 18.
- the earth pre-screened in 3 in the inert waste treatment area 2 is, as previously described, grouped in 19 in an isolated manner in the treatment area 4 with the earthworks from the incoming products 17.
- the stones piled up in 21 are, following the arrow F5, regularly returned to the treatment area 2 of inert waste, in particular to the collection space 5, in particular to the pile of inert waste which corresponds to them, i.e. i.e. the piles of stones.
- the drying hall 23 is illustrated in more detail on the figures 2 and 3 .
- it comprises a metal frame 24 which supports a roof covering 25 below which the land to be dried can be piled up protected from the rain.
- a cladding 26 can be mounted at the top of the lateral sides of the hall to increase the efficiency of this shelter. Below these claddings 26 we can also provide windbreak nets 27 which allow both ventilation of the hall and protection against driving rain.
- the roof covering 25 is provided with a common drainage system which channels rainwater towards a retention basin 28.
- the rainwater thus collected can be stored to be used in particular as water for the manufacture of concrete and/or or for washing concrete mixing and transport tools.
- the water from the retention basin 28 is, following the arrow F6, introduced into the plant as an incoming component 11.
- the concrete plant in the treatment area 9 can then, under favorable conditions, become self-sufficient for its water supply.
- the soil to be dried is piled up on a concrete slab 29 sloping slightly outwards. It is surrounded by concrete plinths 30 so as to form a tank which is sealed by a membrane 31.
- This slab advantageously rests on a stabilized 32, itself arranged on a stone embankment 33.
- the leaching water which percolates through the earth during their stay under the shelter of hall 23 cannot enter the soils or water table. They are collected separately in a collection basin 34 where they can possibly be analyzed before evacuation or treatment.
- floods of dust can be carried by the wind from the inert waste stored in the first treatment area 2.
- spreading on the roads of the installation can be done judiciously at from rainwater collected in the retention basin 28, for example using tank trucks.
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Procédé de gestion de déchets inertes et de terres issues de chantiers, comprenant sur une première aire de traitement (2), une collecte (5) et un criblage de déchets inertes propres et un pré-criblage (3) de déchets inertes terreux avec une évacuation (F1) des terres récoltées vers une deuxième aire de traitement (4), où ont lieu une collecte (19) de terres issues de chantiers extérieurs (17) et des terres issues du pré-criblage (3), un séchage des terres effectué à l'abri de la pluie, sous une couverture (23) qui permet une collecte (28) des eaux de pluie, et une récolte séparée d'eaux de lixiviation (34) provenant de terres humides et, sur une troisième aire de traitement (9), un malaxage (10) d'un liant hydraulique avec de l'eau de malaxage et des granulats formés des déchets inertes criblés (F2), une récupération des eaux usées de lavage des outils (14), lesdites eaux de malaxage et de lavage étant formées au moins partiellement des eaux de pluie collectées par la couverture d'abri (23), une séparation (15) des eaux usées de lavage (14) entre une phase aqueuse basique et une phase solide (16) et un recyclage (F3) de la phase aqueuse basique vers le malaxage et/ou le lavage et un retour (F4) de la phase solide vers l'étape de collecte (5) de déchets inertes.Method for managing inert waste and earth from construction sites, comprising in a first treatment area (2), a collection (5) and screening of clean inert waste and a pre-screening (3) of inert earthy waste with a evacuation (F1) of the harvested land to a second processing area (4), where a collection (19) of land from external construction sites (17) and land from pre-screening (3) takes place, drying of the land carried out sheltered from the rain, under a cover (23) which allows collection (28) of rainwater, and a separate collection of leachate water (34) coming from wetlands and, on a third area of treatment (9), mixing (10) of a hydraulic binder with mixing water and aggregates formed from screened inert waste (F2), recovery of waste water from washing tools (14), said water mixing and washing being formed at least partially from rainwater collected by the shelter cover (23), a separation (15) of the washing waste water (14) between a basic aqueous phase and a solid phase (16) and recycling (F3) of the basic aqueous phase towards mixing and/or washing and a return (F4) of the solid phase towards the collection step (5) of inert waste.
Description
La présente invention est relative à un procédé de gestion de déchets inertes et de terres issus de chantier.The present invention relates to a process for managing inert waste and land from construction sites.
Il est connu que, lors d'un chantier de démolition, de nombreux déchets de construction sont produits, tels que des bétons éventuellement armés, du tarmac, des déchets mixtes, des briques, des pierres, etc. Une simple mise en décharge de ces déchets en vrac n'est actuellement plus envisageable, au-delà du fait que mettre en décharge des déchets mixtes est très coûteux. Aussi ils sont auparavant triés (voir par exemple
D'autre part, il est également connu que tous les travaux de terrassement nécessitent de grands mouvements de terre, que ce soit sous la forme de déblais ou de remblais. Plusieurs déchets inertes précités peuvent d'ailleurs être mêlés à de grandes proportions de terre, tandis que certaines terres peuvent au contraire encore servir de terres arables. A l'heure actuelle il est prévu d'effectuer un tri entre terres valorisables qui sont stockées sur de grandes surfaces et éventuellement traitées en vue d'une récupération par des utilisateurs et des terres non conformes qui doivent alors être évacuées vers des unités de traitement spécialisées.On the other hand, it is also known that all earthworks require large earth movements, whether in the form of excavation or embankment. Several of the aforementioned inert wastes can also be mixed with large proportions of soil, while certain lands can, on the contrary, still be used as arable land. Currently it is planned to sort between reusable land which is stored on large areas and possibly treated with a view to recovery by users and non-compliant land which must then be evacuated to treatment units specialized.
L'invention a pour but de procurer un procédé de gestion des déchets inertes de chantier et des terres issues de chantier d'une manière qui permette une revalorisation de plusieurs de ces déchets et terres, une réduction de leurs coûts de transport, et une exploitation de plusieurs d'entre eux sur place à proximité de leur traitement et stockage avec simultanément une gestion complémentaire des eaux qui permette d'éviter au maximum une consommation d'eau du réseau de distribution et une pollution de l'environnement.The aim of the invention is to provide a method for managing inert construction site waste and land from construction sites in a manner which allows a revaluation of several of these wastes and land, a reduction in their transport costs, and an exploitation to several of them on site near their treatment and storage with simultaneously additional water management which makes it possible to avoid consumption of water from the distribution network and environmental pollution as much as possible.
On résout ce problème suivant l'invention par un procédé de gestion de déchets inertes et de terres issues de chantier, comprenant
- sur une première aire de traitement, une collecte de déchets inertes classifiés en plusieurs déchets inertes propres, présentant moins de 10% en poids de terre, et en plusieurs déchets inertes terreux, pouvant contenir jusqu'à 50% en poids de terre,
- un pré-criblage de chacun des déchets inertes terreux avec une évacuation des terres récoltées vers une deuxième aire de traitement voisine de la première aire de traitement et destinée à une mise en oeuvre dudit procédé de gestion de terres, et une éventuelle récupération des déchets inertes pré-criblés dans les déchets inertes propres,
- un concassage de chacun des déchets inertes propres, et
- un criblage de chacun des déchets inertes propres concassés, en vue de les calibrer et/ou de séparer différentes fractions granulométriques, et un entreposage de chacun de ces déchets inertes criblés,
- sur ladite deuxième aire de traitement, une collecte de terres issues de chantiers extérieurs et desdites terres récoltées lors de l'étape de pré-criblage susdite,
- une séparation et un stockage de terres arables en vue de leur départ,
- a) un criblage de terres restantes avec renvoi des pierres (21) issues de ce criblage vers l'étape de collecte susdite du procédé de gestion des déchets inertes, et un chaulage des terres criblées permettant un stockage de terres chaulées, et/ou
- b) un stockage de terres restantes sous la forme de terres non chaulées,
- et un séchage naturel desdites terres chaulées ou non chaulées effectué à l'abri de la pluie sous une couverture qui permet une collecte des eaux de pluie, une récolte séparée d'eaux de lixiviation provenant de terres humides étant effectué au cours du séchage naturel sous abri susdit, et
- sur une troisième aire de traitement voisine des deux autres aires de traitement, un malaxage un malaxage (10) d'un liant hydraulique avec de l'eau de malaxage et des granulats ainsi qu'éventuellement d'autres composants de production de bétons, en vue d'un départ des bétons produits (12), des granulats étant formés desdits déchets inertes criblés entreposés (F2), à titre de graves, graviers, gravillons et sables,
- un lavage des outils de malaxage et de transport par de l'eau de lavage, une récupération des eaux usées de lavage, lesdites eaux de malaxage et de lavage étant formées au moins partiellement desdites eaux de pluie collectées par ladite couverture d'abri prévue pour ledit séchage naturel des terres,
- une séparation des eaux usées de lavage entre une phase aqueuse basique et une phase solide comprenant des agrégats récupérés et des résidus de béton frais,
- et un recyclage de la phase aqueuse basique vers l'étape de malaxage et/ou l'étape de lavage et un retour de la phase solide vers ladite étape de collecte de déchets inertes.
- in a first treatment area, a collection of inert waste classified into several clean inert wastes, presenting less than 10% by weight of soil, and several inert earthy wastes, which may contain up to 50% by weight of soil,
- a pre-screening of each of the inert earthy waste with evacuation of the harvested land to a second treatment area adjacent to the first treatment area and intended for implementation of said land management process, and possible recovery of the inert waste pre-screened in clean inert waste,
- crushing of each clean inert waste, and
- screening of each of the clean crushed inert waste, with a view to calibrating them and/or separating different particle size fractions, and storage of each of these screened inert waste,
- on said second processing area, a collection of land from external construction sites and said land harvested during the above-mentioned pre-screening step,
- separation and storage of arable land with a view to their departure,
- a) screening of remaining soil with return of the stones (21) from this screening to the above-mentioned collection stage of the management process inert waste, and liming of screened land allowing storage of limed land, and/or
- b) storage of remaining land in the form of unlimed land,
- and a natural drying of said limed or unlimed land carried out sheltered from the rain under a cover which allows rainwater to be collected, a separate collection of leachate water coming from wetlands being carried out during the natural drying under aforementioned shelter, and
- on a third treatment area close to the two other treatment areas, mixing (10) of a hydraulic binder with mixing water and aggregates as well as possibly other concrete production components, in view of a departure of the concretes produced (12), aggregates being formed from said stored screened inert waste (F2), as gravel, gravel, chippings and sand,
- washing the mixing and transport tools with washing water, recovering the washing waste water, said mixing and washing water being formed at least partially from said rainwater collected by said shelter cover provided for said natural drying of the land,
- a separation of washing wastewater between a basic aqueous phase and a solid phase comprising recovered aggregates and fresh concrete residues,
- and recycling of the basic aqueous phase to the mixing step and/or the washing step and a return of the solid phase to said inert waste collection step.
Il est connu que la fabrication de bétons s'effectue dans ce que l'on appelle une centrale de production de bétons. Suivant l'invention cette centrale tire avantage de l'interconnexion des trois aires de traitement voisines précitées. La troisième aire de traitement est pourvue d'au moins un malaxeur dans lequel sont mélangés à un liant hydraulique de l'eau, des granulats et des adjuvants divers en fonction du béton à produire. Des granulats, tels que des sables, des gravillons, des graviers et des graves de tailles granulométriques variées sont ici produits à l'intérieur de la centrale et peuvent donc être consommés directement pour la fabrication de béton dans la centrale elle-même.It is known that the manufacture of concrete is carried out in what is called a concrete production plant. According to the invention this central benefits from the interconnection of the three aforementioned neighboring processing areas. The third treatment area is provided with at least one mixer in which water, aggregates and various adjuvants are mixed with a hydraulic binder depending on the concrete to be produced. Aggregates, such as sand, chippings, gravel and gravel of various particle sizes are produced here inside the plant and can therefore be consumed directly for the production of concrete in the plant itself.
Les installations de fabrication de béton sont utilisées pour fournir des produits de plusieurs natures, comme par exemple des bétons répondant aux spécifications de la marque Bénor ou des bétons riches dits "sur composition", des bétons maigres, ou des mélanges divers à base de ciment et d'agrégats comme des empierrements stabilisés, des sables stabilisés, des chapes au sable de Rhin, des bétons spécifiques (routiers, caverneux, etc). Des adjuvants particuliers sont parfois demandés. Lesdits autres composants de production de béton comprennent par exemple des pigments, des fibres synthétiques ou métalliques, des adjuvants divers ou leur mélange. De plus en plus il est recherché de pouvoir recycler dans les bétons certaines matières déjà préalablement exploitées. Suivant l'invention ces matériels sont donc déjà disponibles sur place et ne requièrent pas des frais coûteux de transport pour leur réutilisation dans les malaxeurs.Concrete manufacturing facilities are used to provide products of several types, such as concrete meeting the specifications of the Bénor brand or rich concretes called "on composition", lean concretes, or various cement-based mixtures. and aggregates such as stabilized stones, stabilized sands, Rhine sand screeds, specific concretes (road, cavernous, etc.). Special adjuvants are sometimes requested. Said other concrete production components include, for example, pigments, synthetic or metallic fibers, various adjuvants or their mixture. Increasingly, it is sought to be able to recycle certain materials already previously used in concrete. According to the invention, these materials are therefore already available on site and do not require expensive transport costs for their reuse in the mixers.
Par ailleurs les terres obtenues par le précriblage de certains déchets inertes terreux peuvent immédiatement être transférées vers l'aire de traitement des terres sans nécessiter de frais coûteux de transport. La production et la consommation de béton induisent une forte consommation d'eau, d'une part pour la production du béton lui-même et d'autre part pour le lavage des outils de malaxage et des outils de transport. Par outils de transport il faut entendre les cuves, pompes, conduits ou camions qui sont utilisés pour transporter les bétons et produits assimilés vers leur destination d'utilisation. Dans une centrale à béton, les eaux usées sont constituées principalement des eaux de lavage des malaxeurs de l'installation et de l'intérieur des cuves des camions malaxeurs transportant les bétons produits vers leur site d'exploitation. Ces eaux de lavage contiennent des agrégats résiduels ainsi que des résidus de béton frais. Ces eaux usées ne peuvent donc pas être évacuées telles quelles dans la nature. Suivant l'invention non seulement la phase liquide basique (pH de l'ordre de 11-13) des eaux usées est réutilisée telle quelle, mais les déchets solides du malaxage sont aussi récupérés sur place par un retour vers la première aire de traitement où a lieu la collecte du procédé de gestion des déchets inertes.Furthermore, the land obtained by the pre-screening of certain inert earthy waste can immediately be transferred to the land treatment area without requiring costly transport costs. The production and consumption of concrete result in high water consumption, on the one hand for the production of the concrete itself and on the other hand for washing the mixing tools and transport tools. By transport tools we mean the tanks, pumps, pipes or trucks which are used to transport concrete and products assimilated towards their destination of use. In a concrete plant, wastewater consists mainly of washing water from the installation's mixers and from the inside of the tanks of the mixer trucks transporting the concrete produced to their operating site. These wash waters contain residual aggregates as well as fresh concrete residues. This wastewater cannot therefore be discharged as it is into nature. According to the invention, not only is the basic liquid phase (pH of the order of 11-13) of the wastewater reused as is, but the solid waste from mixing is also recovered on site by returning to the first treatment area where The collection of the inert waste management process takes place.
La seule phase liquide basique des eaux de lavage ne peut suffire pour fournir l'eau nécessaire à la fois à la fabrication des bétons et au lavage des outils. Il faut bien sûr prévoir d'ajouter constamment de l'eau fraîche dans le circuit.The basic liquid phase of washing water alone cannot be sufficient to provide the water necessary for both the manufacture of concrete and the washing of tools. You must of course plan to constantly add fresh water to the circuit.
Avantageusement au moins l'étape de séchage naturel est effectuée à l'abri de la pluie sous une couverture de toit qui permet une collecte d'eaux de pluie. L'exploitation de ces eaux de pluie permet d'introduire de l'eau fraîche dans le circuit de l'eau du procédé, ce qui permet de compenser, avec la phase aqueuse basique recyclée, la consommation d'eau utilisée pour réagir par exemple avec un liant hydraulique lors de la fabrication de bétons. A cet effet, lesdites eaux de pluie peuvent être avantageusement récoltées dans un bassin de rétention avant leur utilisation. Les eaux de pluie collectées régulièrement à chaque averse, notamment à l'aide de la couverture abritant les terres stockées pour leur séchage naturel, représentent donc un appoint significatif qui permet d'éviter au maximum un apport d'eau extérieur.Advantageously at least the natural drying step is carried out sheltered from the rain under a roof covering which allows rainwater to be collected. The use of this rainwater makes it possible to introduce fresh water into the process water circuit, which makes it possible to compensate, with the recycled basic aqueous phase, the consumption of water used to react, for example with a hydraulic binder during the manufacture of concrete. For this purpose, said rainwater can advantageously be collected in a retention basin before its use. Rainwater collected regularly during each downpour, in particular using the cover sheltering the soil stored for its natural drying, therefore represents a significant addition which makes it possible to avoid an external water supply as much as possible.
L'abri fourni aux terres stockées pour leur séchage permet en outre d'empêcher les eaux de pluie de percoler à travers ces terres, puis de parvenir éventuellement souillées dans le sol ou même la nappe phréatique.The shelter provided to the land stored for drying also prevents rainwater from percolating through this land, then eventually become contaminated in the ground or even the water table.
D'autre part, les terres amenées à l'étape de séchage naturel sous abri peuvent être fortement humides. Des eaux éventuellement souillées, appelées eaux de lixiviation, percolent alors à travers elles. Le procédé suivant l'invention comprend une récolte séparée des eaux de lixiviation provenant de terres humides en cours de séchage, avantageusement en vue de permettre leur analyse, et cela pour empêcher la pénétration de ces eaux dans le sol ou même la nappe phréatique.On the other hand, the land brought to the natural drying stage under cover can be very humid. Possibly contaminated water, called leachate water, then percolates through them. The method according to the invention comprises a separate collection of leachate water coming from wetlands in the process of drying, advantageously with a view to allowing their analysis, and this to prevent the penetration of this water into the ground or even the water table.
Suivant un mode de réalisation de l'invention, les déchets inertes propres sont classifiés en déchets de béton, déchets de tarmac ou hydrocarbonés, déchets mixtes et pierres naturelles, chacun de ces déchets pouvant subir indépendamment les étapes de concassage et de criblage. Après criblage on peut obtenir des déchets inertes propres présentant plusieurs tailles granulométriques, correspondant ou non à des normes courantes, par exemple 0/80, 0/63, 31.5/63, 63/150, 0/20, 0/6.3, 6.3/20 etc., qui seront alors utilisés indépendamment en fonction du produit fini à réaliser. Ces valeurs définissent les ouvertures de maille des tamis utilisés pour réaliser les granulométries et sont à exprimer en mm.According to one embodiment of the invention, the clean inert waste is classified as concrete waste, tarmac or hydrocarbon waste, mixed waste and natural stone, each of these wastes being able to independently undergo the crushing and screening stages. After screening, clean inert waste can be obtained having several particle sizes, corresponding or not to current standards, for example 0/80, 0/63, 31.5/63, 63/150, 0/20, 0/6.3, 6.3/ 20 etc., which will then be used independently depending on the finished product to be produced. These values define the mesh openings of the sieves used to produce the particle sizes and are to be expressed in mm.
Suivant un mode de réalisation particulier du procédé de l'invention, avant l'étape de concassage des déchets inertes propres, il comprend un isolement de déchets de béton armé à partir desquels des ferrailles sont séparées puis stockées en vue d'un départ, par exemple vers un ferrailleur ou une aciérie.According to a particular embodiment of the method of the invention, before the step of crushing the clean inert waste, it comprises an isolation of reinforced concrete waste from which scrap metal is separated then stored with a view to departure, by example to a scrap metal dealer or a steelworks.
Suivant un mode avantageux de réalisation de l'invention, l'étape de séparation de l'eau de lavage consiste en une décantation de cette eau dans un bassin de décantation, un soutirage de la phase aqueuse surnageante et une extraction de la phase solide décantée formée desdits agrégats récupérés et résidus de béton frais. Le soutirage peut s'effectuer par tout moyen connu à cet effet, par exemple par pompage ou à l'aide d'un trop-plein. L'extraction de la phase solide peut être envisagée par exemple par une vis d'Archimède ou encore par dragage à l'aide d'un bulldozer. Tout autre moyen de séparation connu peut évidemment être aussi envisagé, comme par exemple une filtration.According to an advantageous embodiment of the invention, the step of separating the washing water consists of decanting this water in a decanting basin, drawing off the supernatant aqueous phase and extracting the decanted solid phase. formed from said recovered aggregates and fresh concrete residue. The withdrawal can be carried out by any means known for this purpose, for example by pumping or using an overflow. The extraction of the solid phase can be envisaged for example by an Archimedes screw or by dredging using a bulldozer. Any other known means of separation can obviously also be considered, such as filtration.
En cas de sécheresse, des flots de poussières peuvent être entraînés par le vent à partir des déchets inertes entreposés sur la première aire de traitement. Avantageusement, suivant l'invention, il peut être prévu un épandage d'eau de pluie sur les voiries poussiéreuses des aires de traitement, en particulier entre les première et deuxième aires de traitement, notamment à l'aide d'une citerne tractée remplie à l'aide des eaux de pluies collectées par ladite couverture d'abri.In the event of drought, waves of dust may be carried by the wind from inert waste stored in the first treatment area. Advantageously, according to the invention, it can be planned to spread rainwater on the dusty roads of the treatment areas, in particular between the first and second treatment areas, in particular using a towed tank filled with with the help of rainwater collected by said shelter cover.
D'autres détails et avantages de la présente invention ressortiront de la description donnée ci-après, à titre non limitatif, et à l'aide des figures annexées.
- La
figure 1 représente de manière schématique un exemple de réalisation d'installation de production de béton dans laquelle un procédé suivant l'invention est mis en oeuvre. - La
figure 2 représente une vue en perspective d'un hall de séchage pour les terres traitées suivant l'invention. - La
figure 3 représente une vue en coupe du sol du hall de lafigure 2 .
- There
figure 1 schematically represents an exemplary embodiment of a concrete production installation in which a process according to the invention is implemented. - There
figure 2 represents a perspective view of a drying hall for the soils treated according to the invention. - There
Figure 3 represents a sectional view of the floor of the hall of thefigure 2 .
Dans l'installation illustrée sur la
Les déchets de chacun des tas de déchets propres ou en tout cas de certains de ces tas sont alors soumis à un concassage à l'aide d'un concasseur classique 6. Dans le cas de déchets de béton armé, les ferrailles séparées à ce moment sont par exemple entassées en conteneur et évacuées. Sur la
Chacun des déchets concassés sont ensuite passés à travers un ou plusieurs cribles successifs 7, en vue de les calibrer et/ou de séparer différentes fractions granulométriques telles que celles déjà précédemment citées.Each of the crushed waste is then passed through one or more
Dans une aire de traitement proche 9, l'installation illustrée sur la
Certains de ces granulats, pierres ou sables calibrés en 7 peuvent aussi être dirigés vers les produits de départ 8 en vue de leur exploitation dans des installations extérieures.Some of these aggregates, stones or sand calibrated in 7 can also be directed to the starting
D'autres composants entrants 11 peuvent être prévus pour le malaxage des bétons, comme des pigments, des fibres synthétiques ou métalliques, des adjuvants divers, etc... Des granulats d'origine extérieure à l'installation suivant l'invention peuvent aussi être envisagés comme composants entrants 11.Other
A la sortie de l'aire de traitement 9 on obtient les produits de départ 12 habituellement issus d'une centrale à béton qui sont alors enlevés ou livrés à l'extérieur.At the exit of the treatment area 9 we obtain the starting
Le malaxeur 10, mais aussi toutes les cuves, pompes, conduits ou camions ayant servi à la livraison des bétons doivent régulièrement être lavés par de l'eau. Sur la
Dans l'installation illustrée sur la
Suivant la flèche F1, les terres précriblées en 3 sur l'aire de traitement des déchets inertes 2 sont, comme précédemment décrit, regroupées en 19 de manière isolée dans l'aire de traitement 4 avec les terres de terrassement des produits entrants 17.Following arrow F1, the earth pre-screened in 3 in the inert
Parmi les produits entrants 17 il faut aussi considérer la présence de chaux, car, dans l'aire de traitement 4, certaines terres vont être chaulées. Pour ce faire, certaines terres entassées en 19 sont soumises à un ou plusieurs cribles successifs 20, en particulier pour en éliminer les pierres qu'elles contiennent éventuellement et les entasser en 21. Les terres criblées sont alors chaulées dans un mélangeur 22, puis envoyées dans un hall de séchage 23.Among the
D'autres terres entassées en 19 ne sont pas criblées, ni chaulées et sont directement envoyées à l'étape de séchage dans le hall 23.
Après séchage ces terres chaulées ou non chaulées sont à présent des produits finis qui peuvent être considérés comme des produits de départ 18 à exploiter à l'extérieur.Other soil piled up in 19 is not screened or limed and is sent directly to the drying stage in
After drying, these limed or unlimed lands are now finished products which can be considered as starting
Les pierres entassées en 21 sont, suivant la flèche F5, régulièrement ramenées à l'aire de traitement 2 des déchets inertes, en particulier à l'espace de collecte 5, notamment sur le tas de déchets inertes qui leur correspond, c'est-à-dire les amas de pierres.The stones piled up in 21 are, following the arrow F5, regularly returned to the
Le hall de séchage 23 est illustré de manière plus détaillée sur les
Ainsi qu'il est illustré sur la
En cas de sécheresse, des flots de poussières peuvent être entraînés par le vent à partir des déchets inertes entreposés sur la première aire de traitement 2. Avantageusement, suivant l'invention, un épandage sur les voiries de l'installation pourra se faire judicieusement à partir d'eaux de pluie collectées dans le bassin de rétention 28, par exemple à l'aide de camions citernes.In the event of drought, floods of dust can be carried by the wind from the inert waste stored in the
Il doit être entendu que la présente invention n'est pas limitée à l'exemple de réalisation illustré et que bien des modifications peuvent y être apportées sans sortir du cadre des revendications.It should be understood that the present invention is not limited to the illustrated embodiment and that many modifications can be made without departing from the scope of the claims.
Claims (6)
chantiers, comprenant
construction sites, including
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Citations (3)
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US5992774A (en) * | 1998-03-16 | 1999-11-30 | Insun Company, Ltd. | Method and system for recycling construction waste articles |
WO2004098779A1 (en) * | 2003-05-07 | 2004-11-18 | Hoon Il Park | Construction waste sorting system and method of the same |
EP1647331A1 (en) | 2004-10-13 | 2006-04-19 | Stadler Anlagenbau GmbH | Method for sorting construction waste |
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US5992774A (en) * | 1998-03-16 | 1999-11-30 | Insun Company, Ltd. | Method and system for recycling construction waste articles |
WO2004098779A1 (en) * | 2003-05-07 | 2004-11-18 | Hoon Il Park | Construction waste sorting system and method of the same |
EP1647331A1 (en) | 2004-10-13 | 2006-04-19 | Stadler Anlagenbau GmbH | Method for sorting construction waste |
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