FR2744034A1 - Waste water pretreatment plant - Google Patents

Waste water pretreatment plant Download PDF

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Publication number
FR2744034A1
FR2744034A1 FR9601243A FR9601243A FR2744034A1 FR 2744034 A1 FR2744034 A1 FR 2744034A1 FR 9601243 A FR9601243 A FR 9601243A FR 9601243 A FR9601243 A FR 9601243A FR 2744034 A1 FR2744034 A1 FR 2744034A1
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FR
France
Prior art keywords
effluent
sub
basins
materials
primary
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.)
Pending
Application number
FR9601243A
Other languages
French (fr)
Inventor
Raymond Bragoni
Lise Coulet
Herbe Marc Fed
Franck Guarnieri
Maryse Guigo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BRAGONI CONSULTANTS SARL
Original Assignee
BRAGONI CONSULTANTS SARL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BRAGONI CONSULTANTS SARL filed Critical BRAGONI CONSULTANTS SARL
Priority to FR9601243A priority Critical patent/FR2744034A1/en
Publication of FR2744034A1 publication Critical patent/FR2744034A1/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/04—Combinations of filters with settling tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0003—Making of sedimentation devices, structural details thereof, e.g. prefabricated parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0018—Separation of suspended solid particles from liquids by sedimentation provided with a pump mounted in or on a settling tank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0024—Inlets or outlets provided with regulating devices, e.g. valves, flaps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
    • B01D21/0033—Vertical, perforated partition walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2488—Feed or discharge mechanisms for settling tanks bringing about a partial recirculation of the liquid, e.g. for introducing chemical aids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • B01D21/302—Active control mechanisms with external energy, e.g. with solenoid valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • B01D21/34—Controlling the feed distribution; Controlling the liquid level ; Control of process parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
    • B01D29/605—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by level measuring

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Activated Sludge Processes (AREA)

Abstract

The plant consists of one or more primary tanks (2) for homogenisation of the waste water and separation of heavy materials from it before it is transferred to the next treatment cycle, such as a lagoon, biological process, activated mud or decanter/digester. The primary tank is divided into sections (2a,2b) by one or more permeable partitions which act as filters which trap heavy particles and floating materials, allowing only dissolved and homogenised materials through into the adjoining section. The plant is controlled by a hydraulic system with one or more pumps (4), and a flow control system (5,6,7) which can be operated manually or by a programmable micro-computer unit (10).

Description

La présente invention est relative à un procédé pour le prétraitement des eaux résiduaires destinées à être par la suite traitées selon un quelconque procédé d'épuration. The present invention relates to a process for the pretreatment of waste water intended to be subsequently treated by any purification process.

Traditionnellement, I'épuration complète des eaux résiduaires se réalise selon les étapes suivantes:
- le prétraitement,
- le traitement primaire,
- I'éiimination de la pollution carbonée,
- I'élimination de l'azote et du phosphore,
- le traitement complémentaire,
- le traitement et l'élimination des boues.Traditionally, the complete purification of waste water is carried out according to the following stages:
- pre-treatment,
- primary treatment,
- elimination of carbon pollution,
- elimination of nitrogen and phosphorus,
- complementary treatment,
- treatment and disposal of sludge.

La présente invention s'inscrit donc dans le cadre des deux premières étapes de ce cycle. The present invention therefore falls within the framework of the first two stages of this cycle.

Dans les procédés traditionnels, le prétraitement a pour objectif de séparer les matières les plus grossières et les éléments susceptibles de gêner les étapes ultérieures du traitement. II comprend généralement trois opérations:
- le dégrillage a pour objectif de retenir à l'entrée de la station d'épuration les déchets volumineux selon différents principes (grilles manuelles, grilles mécaniques, dilacération, le tamisage...),
- le dessablage a pour but d'extraire les sables présents dans l'effluent brut afin d'éviter des dépôts dans les canalisations et de perturber les autres stades du traitement. Lors de cette seconde opération, les matières extraites sont elles aussi stockées à l'entrée de la station d'épuration.In traditional processes, the aim of pretreatment is to separate the coarsest materials and the elements liable to interfere with the subsequent stages of the treatment. It generally comprises three operations:
- the purpose of screening is to retain bulky waste at the entrance to the treatment plant according to different principles (manual grids, mechanical grids, shredding, sieving, etc.),
- the purpose of sand removal is to extract the sands present in the raw effluent in order to avoid deposits in the pipes and to disturb the other stages of treatment. During this second operation, the extracted materials are also stored at the entrance to the treatment plant.

- le déshuilage consiste à séparer les huiles et les hydrocarbures de l'effluent brut. Là encore, la matière ainsi collectée est stockée à l'entrée de la station d'épuration. - deoiling consists in separating oils and hydrocarbons from the raw effluent. Again, the material thus collected is stored at the entrance to the treatment plant.

Le procédé synthétise les opérations décrites ci-dessus. II accepte la totalité de l'effluent amené à la station d'épuration. Les eaux usées arrivent sur le site même de la station et sont rejetées directement dans le ou les bassins primaires au sein desquels s'opère l'homogénéisation et la séparation des résidus et des matières lourdes contenus dans les eaux à traiter. Aucun dégrillage, dessablage et déshuilage n'est donc nécessaire en tête de la station d'épuration et ce quel que soit la nature des matières domestiques reçues. Seules les matières imputrescibles qui ne seront pas atteintes par ce processus resteront prisonnières dans le bassin primaire dans l'attente d'une évacuation manuelle par pompage.Ce procédé supprime par conséquence l'obligation de collecte des déchets qui s'accumulent à l'entrée de la station et qui occasionnent d'importantes nuisances (odeurs, pollutions...).  The method synthesizes the operations described above. It accepts all of the effluent brought to the treatment plant. The wastewater arrives at the site of the station and is discharged directly into the primary tank (s) within which the homogenization and separation of the residues and heavy materials contained in the water to be treated takes place. No screening, desanding and de-oiling is therefore necessary at the head of the treatment plant, regardless of the nature of the domestic materials received. Only the rot-proof material that will not be reached by this process will remain trapped in the primary tank pending manual evacuation by pumping. This process therefore eliminates the obligation to collect waste that accumulates at the entrance of the station and which cause significant nuisance (odors, pollution ...).

Le procédé prépare l'effluent en vue d'accroître l'efficacité des étapes de traitement ultérieurs couramment utilisées (lagunes, disques biologiques, boues activées, digesteurs décanteurs...). II homogénéise l'effluent de façon entièrement biologique. II ne nécessite aucune adjonction d'additifs. Le cycle d'homogénéisation étant entièrement régulé, il s'adapte aux variations joumalières et saisonnières de la charge organique et ne requiert par conséquent aucune intervention humaine. The process prepares the effluent in order to increase the efficiency of the commonly used subsequent treatment steps (lagoons, biological discs, activated sludge, settling digesters ...). It homogenizes the effluent entirely biologically. It requires no addition of additives. The homogenization cycle being fully regulated, it adapts to daily and seasonal variations in organic load and therefore requires no human intervention.

Le procédé crée:
- d'une part une ambiance particulièrement favorable au développement de la flore bactérienne qui participe à la dégradation naturelle des substances organiques biodégradables contenues dans les eaux de rejet,
- d'autre part il donne aux différentes matières qui composent l'effluent l'obligation de trouver leur position au sein de ce cycle de prétraitement dans l'attente irrémédiable d'une dégradation physique et biologique.The process creates:
- on the one hand, an atmosphere particularly favorable to the development of the bacterial flora which participates in the natural degradation of biodegradable organic substances contained in the waste water,
- on the other hand, it gives the different materials that make up the effluent the obligation to find their position within this pretreatment cycle while awaiting irreversible physical and biological degradation.

Le principe élaboré repose sur l'évidence que l'effluent à traiter n'a pas toujours la même charge organique, sa variation est souvent importante, particulièrement dans les zones rurales ou touristiques. Le fait d'accepter la totalité de la matière organique entrante (matière fécale, cellulose et autres) dans les bassins primaires crée un équilibre de la charge organique et facilite son homogénéisation. Ce phénomène est amplifié par la régulation hydraulique.  The principle developed is based on the evidence that the effluent to be treated does not always have the same organic load, its variation is often significant, particularly in rural or tourist areas. Accepting all of the incoming organic matter (faecal matter, cellulose and others) in the primary basins creates a balance in the organic load and facilitates its homogenization. This phenomenon is amplified by hydraulic regulation.

La figure 1 représente le synoptique du dispositif selon l'invention. Figure 1 shows the block diagram of the device according to the invention.

Ce dispositif comporte un collecteur (1) qui rejette l'effluent domestique dans un des bassins primaires (2). Ce bassin primaire peut être réalisé en béton préfabriqué ou non, voir en matière plastique. II est de forme quelconque (cylindrique ou cubique). Sa dimension sera de l'ordre de 10 à 50 mètres cubes. Le nombre de bassins primaires dépend du nombre d'équivalent habitant à traiter. This device comprises a collector (1) which discharges the domestic effluent into one of the primary basins (2). This primary basin can be made of precast concrete or not, see plastic. It is of any shape (cylindrical or cubic). Its size will be of the order of 10 to 50 cubic meters. The number of primary basins depends on the number of inhabitant equivalent to be treated.

Chaque bassin primaire est compartimenté par une ou plusieurs cloisons perméables (3) formant ainsi des sous bassins (2a) et (2b). Ces cloisons assurent un rôle de filtre et contribuent à l'homogénéisation de l'effluent, favorisant ainsi la suite du cycle d'épuration. Elles peuvent être réalisées en pièces rapportées préfabriquées ou faire partie intégrante de la structure du bassin primaire. Each primary basin is compartmentalized by one or more permeable partitions (3) thus forming sub-basins (2a) and (2b). These partitions act as a filter and contribute to the homogenization of the effluent, thus promoting the rest of the purification cycle. They can be made in prefabricated patches or be an integral part of the structure of the primary basin.

Le bassin primaire ainsi cloisonné a pour fonction de piéger, dans l'un des sous bassins (2b), les particules lourdes au fond (sable et autres...) et les particules légères en surface (mousses). La cloison sera par conséquence étanche dans sa partie basse et dans sa partie haute. Elle sera cependant perméable (alvéoles de quelques centimètres de diamètre) en son milieu afin d'assurer le transit de l'effluent homogénéisé d'un sous bassin (2b) vers un sous bassin (2a). The primary basin thus partitioned has the function of trapping, in one of the sub-basins (2b), the heavy particles at the bottom (sand and others ...) and the light particles on the surface (mosses). The partition will therefore be sealed in its lower part and in its upper part. However, it will be permeable (cells a few centimeters in diameter) in the middle to ensure the transit of the homogenized effluent from a sub-basin (2b) to a sub-basin (2a).

Le sous bassin (2a) est muni d'un système hydraulique de pompage (4) et d'une régulation de débit de l'effluent. Le pompage de l'effluent homogénéisé peut se faire au moyen d'une ou plusieurs pompes électriques placées dans les sous bassins. La régulation du débit permet de recycler tout ou partie de 'effluent pompé au sein du bassin primaire ainsi que de transférer l'effluent vers l'étape suivante du cycle de traitement (lagunes, disques biologiques, boues activées, décanteurdigesteurs...). Cette régulation peut s'effectuer en dimensionnant différemment le diamètre des tuyaux (5) et (6) du circuit hydraulique par exemple eVou en intégrant un dispositif de fermeture (7) (vannes réglables mécaniques ou électromécaniques). The sub-basin (2a) is provided with a hydraulic pumping system (4) and an effluent flow regulation. Pumping of the homogenized effluent can be done by means of one or more electric pumps placed in the sub-basins. The regulation of the flow makes it possible to recycle all or part of the effluent pumped within the primary basin as well as to transfer the effluent to the next stage of the treatment cycle (lagoons, biological discs, activated sludge, decanter-digesters ...). This regulation can be carried out by dimensioning differently the diameter of the pipes (5) and (6) of the hydraulic circuit for example eVou by integrating a closing device (7) (adjustable mechanical or electromechanical valves).

Le mouvement d'eau généré par le reflux de l'effluent au sein du bassin primaire permet de réitérer la filtration de l'effluent (reflux dans un sous bassin (2b)), d'éviter la sédimentation des particules lourdes au fond des sous bassins (2a) et (2b) et d'assurer à terme l'homogénéisation de l'effluent. The movement of water generated by the reflux of the effluent within the primary basin makes it possible to reiterate the filtration of the effluent (reflux in a sub-basin (2b)), to avoid the sedimentation of heavy particles at the bottom of the sub basins (2a) and (2b) and ultimately ensure the homogenization of the effluent.

La régulation du débit de l'effluent à prétraiter peut être manuelle, ou comme dans le cas du pompage, être assisté par un système informatique composé d'un automate programmable ou d'un micro ordinateur (11) et d'une interface électronique (10). L'ensemble du cycle hydraulique peut être soit programmé par l'utilisateur soit déduit par le système informatique qui se fonde sur le moment de la joumée, la saison, des mesures de niveaux, des quantités de volumes recyclés et/ou transférés vers les étapes suivantes du cycle de traitement. Ces différentes informations sont foumies par des capteurs de niveaux (9) qui indiquent au système informatique la quantité d'effluent reçue par le dispositif et par conséquent la quantité à prétraiter. Des contacts de niveaux de sécurité (8) indiquent au système informatique l'état du bassin (plein ou vide) afin de prévenir tout dysfonctionnement du dispositif.  The regulation of the flow rate of the effluent to be pretreated can be manual, or as in the case of pumping, be assisted by a computer system composed of a programmable controller or a microcomputer (11) and an electronic interface ( 10). The entire hydraulic cycle can either be programmed by the user or deducted by the computer system which is based on the time of the day, the season, level measurements, quantities of volumes recycled and / or transferred to the stages of the treatment cycle. These various pieces of information are provided by level sensors (9) which indicate to the computer system the quantity of effluent received by the device and consequently the quantity to be pretreated. Security level contacts (8) indicate to the computer system the state of the pool (full or empty) in order to prevent any malfunction of the device.

Claims (5)

REVENDICATIONS 1) Procédé selon lequel les eaux usées arrivent sur le site même de la station et sont rejetées directement dans un ou plusieurs bassins primaires (2) dans lesquels s'opèrent l'homogénéisation, la séparation des résidus et des matières lourdes contenus dans les eaux à traiter, avant leur transfert vers l'étape suivante du cycle de traitement (lagunes, disques biologiques, boues activées, décanteurdigesteurs...). Le bassin primaire est séparé par une ou plusieurs cloisons perméables (3) qui agissent comme des filtres et piègent ainsi dans l'un des sous bassins (2b) les particules lourdes et les matières flottantes qui restent en surface.1) Process according to which the wastewater arrives on the site of the station and is discharged directly into one or more primary tanks (2) in which the homogenization takes place, the separation of residues and heavy materials contained in the waters to be treated, before their transfer to the next stage of the treatment cycle (lagoons, biological discs, activated sludge, decanter-digesters ...). The primary tank is separated by one or more permeable partitions (3) which act as filters and thus trap in one of the sub-tanks (2b) the heavy particles and the floating materials which remain on the surface. Seules les matières dissoutes et homogénéisées transitent à travers la ou les cloisons vers un sous bassin (2a).Only dissolved and homogenized materials pass through the partition (s) to a sub-basin (2a). 2) Procédé suivant la revendication 1 caractérisé en ce que le reflux au sein des différents sous bassins (2b) permet de réitérer la filtration de l'effluent.2) Method according to claim 1 characterized in that the reflux within the various sub-basins (2b) allows to reiterate the filtration of the effluent. 3) Procédé suivant les revendications 1 et 2 caractérisé en ce que le reflux au sein des sous bassins (2a) et (2b) permet d'homogénéiser l'effluent à prétraiter et d'éviter la sédimentation des particules contenues dans celui ci.3) Method according to claims 1 and 2 characterized in that the reflux within the sub-basins (2a) and (2b) makes it possible to homogenize the effluent to be pretreated and to avoid sedimentation of the particles contained therein. 4) Procédé suivant les revendications 1, 2 et 3 caractérisé en ce que la régulation de débit permet de recycler tout ou partie de l'effluent pompé dans le bassin primaire.4) Method according to claims 1, 2 and 3 characterized in that the flow control allows to recycle all or part of the effluent pumped into the primary tank. 5) Dispositif selon les revendications précédentes prises dans leur ensemble caractérisé par un système hydraulique composé d'une ou plusieurs pompes (4) et d'une régulation de débit (5,6,7) commandé manuellement ou par un système informatique (automates programmables, micro-ordinateurs...) (10 et 11). Ce système assure d'une part le reflux de l'effluent au sein des différents sous bassins et d'autre part le transfert de l'effluent vers l'étape suivante du cycle de traitement. 5) Device according to the preceding claims taken as a whole characterized by a hydraulic system composed of one or more pumps (4) and a flow control (5,6,7) controlled manually or by a computer system (programmable controllers , microcomputers ...) (10 and 11). This system ensures on the one hand the reflux of the effluent within the different sub-basins and on the other hand the transfer of the effluent to the next stage of the treatment cycle.
FR9601243A 1996-01-29 1996-01-29 Waste water pretreatment plant Pending FR2744034A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090269A1 (en) * 2001-05-09 2002-11-14 Ingenium Sarl Biological treatment reactor in a purification plant
FR2824548A1 (en) * 2001-05-09 2002-11-15 Raymond Antoine Bragoni Waste water treatment plant biological reactor has cylinders made from thin plastic discs separated by cellular material with micro-organisms
FR2824550A1 (en) * 2001-05-09 2002-11-15 Ingenium Waste water treatment plant biological reactor has cylinders made from thin plastic discs separated by cellular material with micro-organisms

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7431819U (en) * 1975-02-13 Aquanort Ingenieur Skirde + Co Device for the recovery of used water, in particular washing water from vehicle washing systems
DE9003226U1 (en) * 1990-03-20 1990-07-26 Passavant-Werke AG, 6209 Aarbergen Fat or starch separator
JPH05228063A (en) * 1992-02-18 1993-09-07 Takasago Internatl Corp Heating device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7431819U (en) * 1975-02-13 Aquanort Ingenieur Skirde + Co Device for the recovery of used water, in particular washing water from vehicle washing systems
DE9003226U1 (en) * 1990-03-20 1990-07-26 Passavant-Werke AG, 6209 Aarbergen Fat or starch separator
JPH05228063A (en) * 1992-02-18 1993-09-07 Takasago Internatl Corp Heating device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1, no. 83 (M - 76)<1944> 30 July 1977 (1977-07-30) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090269A1 (en) * 2001-05-09 2002-11-14 Ingenium Sarl Biological treatment reactor in a purification plant
FR2824548A1 (en) * 2001-05-09 2002-11-15 Raymond Antoine Bragoni Waste water treatment plant biological reactor has cylinders made from thin plastic discs separated by cellular material with micro-organisms
FR2824550A1 (en) * 2001-05-09 2002-11-15 Ingenium Waste water treatment plant biological reactor has cylinders made from thin plastic discs separated by cellular material with micro-organisms

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