..BE..DE....FRGB........NLSE......................*JDIM360 - Ver 2.5 (21 Aug 1997) 2100000/1 2100000/20437465EUROPEAN PATENT SPECIFICATIONB119930303EP89910950.8198909271991032219911203svenen880340519880927SE199303031993091991072419913019930303199309199207085 5E 03F 7/10 AdeVerfahren und Vorrichtung zur Entfernung von Schlämmen und Reinigung von AbwässernenMethod and apparatus for removing sludge and purifying waste waterfrProcédé et appareil pour éliminer des boues et purifier des eaux uséesEP-A- 0 164 004DE-B- 2 605 924GB-A- 134 140GB-A- 1 460 031SE-A- 8 306 105US-A- 2 010 540Patent Abstracts of Japan, Vol. 3, No 105, M71, abstract of JP 54-100138, publ 1979-07-08, KYOKUTO KAIHATSU KOGYO K.K.LARSSON, BoBox 8024S-390 08 KalmarSELARSSON, IngemarLudenvägen 33 AS-541 39 SkövdeSELARSSON, Bo00399510Box 8024S-390 08 KalmarSELARSSON, Ingemar00347890Ludenvägen 33 AS-541 39 SkövdeSESiebmanns, Hubertus00024154Gotapatent AB, Box 154561 22 HuskvarnaSEBEDEFRGBNLSESE890052419890927svWO90034741990040519900819900405000000

The present invention relates to a method of removing sludge and purifying waste water according to the preamble of claim 1. Also, the present invention relates to a device designed to remove sludge and purify waste water according to the first device claim.

The modern way of treating sludge and waste water is unsatisfactory for several reasons. Wells for waste water e.g. must be emptied at intervals, which usually is done by a so called sludge exhaustion to a tank truck, which subsequently empties the waste water into a stationary purification plant, Such transport can be most time and energy consuming and existing purification plants often have a limited capacity, and consequently the disposal of irregularly collected waste water can result in problems.

From GB, A, 1 460 031, a method and a device are known in which sludge and waste water are pumped up from a waste water well into a purification device, The purification device includes a screen. The purified water is to be fed to and stored, respectively, in a reject water compartment, from which the same by means of a pump is to be fed under pressure to an ejector nozzle. The nozzle is immersed into said well. The medium is restored, while it is co-ejected with unpurified sludge and waste water present in the well via a conduit to a gravity separator tank and subsequently into a separator vehicle including said screen on its way to the reject water compartment.

Thus, the object of the present invention is to create opportunities for a less time and energy consuming handling of waste water, Another object of the invention is to, in several other respects, develop the state of the art in this field.

These objects are attained according to the present invention by performing a method of the type suggested in the introduction in the way set forth in the characterizing clause of patent claim 1. Said objects are also attained by means of a device, which mainly is constructed in the way set forth in the device claim 3.

Additional characterizing features and advantages of the invention are set forth in the following description, reference being made to the attached drawings, which schematically show preferred embodiments designed to perform the method according to the invention and of the device according to the invention respectively. The drawing show in detail:

In Fig. 1 a device 1 is shown, which e.g. is mobile, particularly a tank truck, on the platform 2 of which a unit 4 for course separation and a unit 3 for fine separation are mounted. The exterior of the latter can be designed as a sedimentation basin, while the former includes a filter 23 and a sludge press 5. A tank 6 can be mounted below unit 4 as well as a distribution equipment, not shown in detail, for precipitation chemicals. The sludge press and the screen are connected to each other through a passage 7 and the screen and unit 3 through a passage 8, while a compressed-water conduit 18 is connected to a well 10, which contains sludge and waste water and a transport conduit 9 connects the well to unit 4. In the sedimentation basin overflow box 11 is positioned, from which one or several conduits 12, through closed or perforated partitions 16, lead to the suitably laterally positioned lower areas of the basin, namely the so called reject water compartments 19, from which one or several conduits 14 via a pump 22 lead to compressed-water conduit 18, while one or several conduits 13 are designed to transport separated impurities back to unit 4. The entire process preferably is remotely controllable by means of a radio control unit 15.

A preferred working cycle is performed in the following way: purified water from compartments 19 is pumped by means of pump 22 via conduits 14 and 18 to an ejector nozzle 17, which is mounted at the free end of the latter conduit and immersed into e.g. a three-compartment septic tank and in which the pressurized water is injected into the inlet by conduit 9, a strong suction effect being obtained, which pulls along the waste water and sludge present in the well, which subsequently are transported to coarse separation unit 4, which can be designed as is shown in Fig. 5 and is described more in detail in the following. In unit 4 the screen suitably is designed as a rotary drum 23. That waste water, from which coarse impurities have been removed in unit 4, i.e. the prepurified waste water, is subsequently transported to unit 3. On its way precipitation chemicals suitably are added in order to precipitate e.g. phosphorus and possibly also nitrogen, in addition to the suspended material, from the waste water. The precipitation of the flocculated material must be done quickly and consequently a turbulence to some extent in the conduit to the fine separation unit is required.

The water subsequently is lead into the central portion of unit 3, in which the flocculated material is allowed to descend to the bottom and in which the water, which in this way has been purified to a greater extent, is allowed to flow over from overflow box 11 in order to be lead, through the lateral walls 16, suitably solely via conduits "12", to the reject water compartments. The purified water is used, as has been mentioned, to drive the ejection device, The excess can be returned to the well. It is e.g. possible to evacuate and purify the entire contents of a well and subequently or continuously bring back the purified water. The word "continuously" means, that the restoration of purified water can be done also before the sludge suction operation is concluded. Coarse impurities accumulated in the drum screen and chemical sludge brought back to the drum screen are concentrated and brought to the sludge press, which suitably is actuated at the same time a the drum screen, and subsequently the sludge press is run intermittently. The compressed waste material can be collected in e.g. plastic bags and the press water can be recycled to the process.

It has already been indicated, that portions of the various figures and embodiments respectively may be exchanged or be combined in an arbitrary manner.

The embodiment shown in Fig. 2 is similar to the preceding one. However, the fine separation is not done via an over flows box but is done by means of a drum screen 20. the drum screen comprises a drum 21 having a pervious, e.g. perforated support surface 24, which is covered by a filter cloth 25. However, the waste water, with all its sludge and all its impurities, firstly flows to drum screen 23, which according to Fig. 5 comprises a perforated drum 31 having an internally fastened feed screw 26. The drum is inclined towards inlet 27 with e.g. 5-30°, preferably about 5°, while outlet 28, at a higher level, is designed to feed out separated coarse impurities, or a so called sludge, which on its way to the outlet is dewatered continuously and subsequently falls out through a collection funnel 29, which is mounted below the outlet, from which it is transported further, e.g. through the gravitation, to sludge press 5, in which an automatic dewatering takes place and a so called susage is built, which subsequently is collected in e.g. plastics bags. The reject water from the sludge press and also the water, which flows through the screen drum, are collected, e.g. in a vessel 30 below the screen drum and are pumped back to unit 3, suitably via a collection tank 54, which is positioned below unit 3, by means of a pump 32, which is mounted in passage 8. Passage 8 can be connected to conduits 33, 34 from dosing devices, not shown, for chemicals of type mentioned, which are fed from tanks 6, as has already been mentioned. A pump 35,36 can be mounted in each one of conduite 33 and 34 respectively and belongs to the dosing device, which is not shown for the rest but is known in principle.

While the drum filter in Fig. 3 is mounted with its longitudinal direction perpendicular to the longitudinal direction of the vehicle or the like, which carries the purification device, in Fig. 2 it is mounted in the longitudinal direction of the vehicle. However, the principal construction can be the same. It is shown if Fig. 3 , that the coarsely purified water, by means of pump 32, is pumped from container 31 to unit 3, which all around is designed as a mainly closed container, in which the coarsely purified water surrounds the drum filter and passes through its cloth and perforations, fine solid or semi-liquid particles being separated. The water, which has been filtered in this way, subsequently flows from the interior of the drum filter via a hollow shaft 37, which is positioned at the end of the filter, and a vertical shaft 38 (see also Fig. 6), up to an outlet 39 and is discharged into a reject water tank 19. The accumulation of particles on the filter cloth reduces the perviousness of the cloth and the water surface level is unit 3, which also can be called a filter chamber, increases. When the maximum level 40 has been reached, a level control is actuated and activates, in a mechanical or preferably in an electronic way, a filter cleaning process, which is done through a suction with a nozzle 41, which is engaging the drum in the form of a ramp along the entirety of the drum, stuck particles being sucked by means of a pump 42 but also surrounding water and even water from the interior of the drum, which is sucked through the cloth, which in this way is rinsed efficiently. This sucked-off mixture can, via a passage 43, be restored to unit 4. Since the drum, which is driven by a motor 44, is rotating during the purification phase, a comprehensive efficient cleaning is accomplished. By means of a special filter cloth, known per se, it is possible, when a filtration is done, after a chemical precipitation, to separate very small particles, e.g. iron and aluminum phosphate, it being possible to obtain as low as 0.2 mg/l total phosphorus and 5 mg/l SS (= suspended substance). The texture of the cloth makes it possible also separate particles having a very low mechanical strength and stability. A filter cloth having the described desirable properties can be bought on the market under the trade name MEKANAFILTER TYP 102.

Furthermore, in Fig. 6 a minimum level 45 is shown; when this level is reached, the purification device can be stopped, while a security outlet 46 can be used, in case outlet 39 is blocked up. It is shown in Fig. 3, that nozzle 41 or pump 42 has an arm 47, which extends downwards to the area below the drum. This arm is an auxiliary nozzle, possibly in the form of a ramp, designed to suck off accumulations of impurities below the drum. This auxiliary nozzle suitably can be connected separately. Nozzle 41 can be fastened and adjusted respectively in various position by means of fasteners 48 and 49 respectively.

By means of the nozzle shown in Fig. 7 the following performances can be attained:

The main advantage of this combined pressure and suction action is that large lifting heights easily can be obtained, that no pump stop-up can occur and that desirable combinations of pressure in nozzle/amount of pressurized water/amount of waste water or sludge/lifting height easily and steplessly can be obtained. Fig 7 shows that nozzle 17 is provided with fasteners for conduits 9 and 18, the former having a larger diameter in order to hold the two types of medium, i.e. pressurized water Q₁ and waste watre-sludge Q₂. Nozzle 17 has a jet 51. This jet is provided with surrounding outer restrictions at a distance, which can be perforated or have meshes. The characterizing features described above and shown in the drawings are only non-limiting embodiments of the invention, which can be modified and supplemented in an arbitrary way within the scope of the following patent claims. Thanks to this ejection principle i. a. a dilution and a more practical treatment of the occuring impurities are achieved.

 A method of removing sludge and purifying waste water, which are pumped up from a waste water well, a three-compartment septic tank or the like (10) and into a tank truck or another mobile or stationary purification device (1), the water, which is fed by pumping, being brought through screens (23) and/or filters or the like (20) in order to purify it, at least a portion of said water, after having passed said screens, filters or the like, by means of a pump (22) via a primary or pressurized water conduit (18), being fed under pressure, e.g. between 5 and 10 bars, into an ejector nozzle (17), which is immersed into said well or the like (10) and is restored, while unpurified sludge and waste water present in the well are co-ejected in order to obtain i.a. a dilution and a more practical treatment of occuring impurities, via a secondary or transport conduit (9) to said screens, filters or the like, namely a coarse separation screen (23), characterized in that a rotary drum is used as a screen for treating coarse impurities, subsequent to which said water is passed through fine separation means (20), on its way to reject water compartments (19), from which the purified is returned to said ejector nozzle (17), that the pre-purified water is passed through a collection tank (31), from which it is pumped to a fine separation unit (3), preferably while adding chemical precipitation agents, particularly in order to precipitate phosphorus and possibly also nitrogen, and that the prepurified water is passed from the exterior into the interior of a drum filter (20, 21, 24, 25) and from there out through an axial outlet (37), via a shaft (38) and an outlet (39) from said shaft to a reject water tank (19), the waste water level in said fine separation unit (3) being measured and connected to a cleaning device (41,42,47,48,49) for the drum filter in order to connect and disconnect said device. A method according to claim 1, characterized in that the pressure in the ejector nozzle (17), which is generated by the pump (22) is used to steplessly adjust the ratio: amount of pressurized water/amount of waste water and sludge/lifting height. A device for performing the method according to claim 1, in which sludge and waste water, which are to be purified, separated and removed respectively, are pumped up from a waste water well, a three-compartment septic tank or the like (10) and into a tank truck or another mobile or stationary purification device (1), which includes screens (23) and/or filters or the like (20), which are for a purification of the pump-fed medium, the purified water is provided to be fed to an stored, respectively, in a reject water compartment (19), from which the same by means of a pump (22), via a primary or pressurized water conduit (18), is to be fed under pressure, e.g. between 5 and 10 bars, to an ejector nozzle (17), which is immersed into said well or the like (10), and be restored, while it is co-ejected jointly with unpurified sludge and waste water present in the well in order to obtain i.a. a dilution and a more practical treatment of occuring impurities, via a secondary or transport conduit (9) to said screens, filter or the like, namely a coarse separation screen (23), characterized in that the latter is a rotary drum for the separation of coarse impurities, which drum is followed by fine separation means (20), which are to be passed by said water, from which the coarse impurities have been removed, on its way to said reject water compartment (19), from which the purified water is to be brought back to said ejector nozzle (17), that the pre-purified water is provided to be passed through a collection tank (31), from which it is pumped to fine separation unit (3), preferably while adding chemical precipitation agents, particularly in order to precipitate phosphorus and possibly also nitrogen, and that the prepurified water is provided to be passed from the exterior into the interior of a drum filter (20,21,24,25) being effective as fine separation means and having an axial outlet (37), via a shaft (38) and an outlet (39) from said shaft to a reject water tank (19), the waste water level in said fine separation unit (3) being measured and connected to a cleaning device (41,42,47,48,49) for the drum filter in order to connect and disconnect said device. A device according to claim 3, characterized in that said coarse separation unit (4) is designed to feed a sludge press (5) with the separated coarse material, which press is provided with packing means for the dewatered compressed coarse material. A device according to claim 3, characterized in that said fine separation unit (3) is designed as a sedimentation basin, in which an overflow box (11) is disposed, from which one or several conduits (12), through closed or perforated walls (16), leads to preferably laterally disposed reject water compartments (19), from which conduits (14), via said pump (22), lead to said pressurized-water conduit (18), while conduits (13) are designed to feed separated impurities from the lower part of said sedimentation basin back to said coarse separation unit and a renewed coarse separation treatment. A device according to claim 3, characterized in that a drum filter (20) is mounted in the fine separation unit (3), which filter comprises a drum (21) having a pervious, e.g. perforated support surface (24), covered with a filter cloth, which drum filter is designed to radially from its exterior and to its interior receive pre-purified medium from the coarse separation unit (4) for a fine separation and to discharge the medium, purified in this way, through a hollow shaft (37) to a vertical shaft (38), which via an outlet (39) leads to the reject water compartment (19), and outside the drum filter a cleaning device (41,42) being mounted, mainly comprising nozzles (41) and a pump (42) for suction of impurities from the exterior of the drum filter and transport of the same to the coarse separation unit, which cleaning device preferably also comprises a nozzle ramp and can be connected and disconnected by means of level controls (40,45) in the shaft (38) and/or in the space surrounding the drum filter. A device according to any of claims 3-6, characterized in that said drum screen (23) in the coarse separation unit (4) comprises a perforated drum (31) having a feed screw (26) fastened in its interior, which drum is inclined downwards towards the outlet of the transport conduit (9), which outlet also is the inlet (27) of the drum screen, with 5-30°, preferably about 15°, while the outlet (28) of the drum, at a higher level, is designed to discharge separated coarse impurities, which are to be continuously dewatered on their way to the outlet (28), the water obtained in this way being designed to flow downwardly into a vessel (30) and be pumped back to the fine separation unit (3), suitably via a collection tank (54) positioned below, by means of a pump (32), mounted in the passage (8) between the two units, to which passage preferably conduits (33,34) and pumps (35,36) are connected in order to feed chemicals from tanks (6) containing said chemicals. Verfahren zum Entfernen von Schlamm und Reinigen von Abwässern, die aus einem Abwasserbrunnen, einem Dreikammerklärbehälter od.dgl. (10) in einen LKW-Tank oder eine andere bewegliche oder stationäre Reinigungsanlage (1) hinaufgepumpt werden, wobei das hinaufgepumpte Wasser durch Siebe (23) und/oder filter od.dgl. (20) zwecks Reinigen gefördert wird, wobei wenigstens ein Teil genannten Wassers nach Passieren durch genannte Siebe, Filter od.dgl. mittels einer Pumpe (22) über eine primäre oder unter Druck gesetzte Wasserleitung (18) unter einem Druck von beispielsweise 5-10 bar in eine in genannten Brunnen od.dgl. (10) eingetauchte Ejektordüse (17) gefördert und wiedergewonnen wird, während ungereinigte Schlämme und Abwässer im Brunnen mitejektiert werden, um unter anderem eine Verdünnung und eine mehr praktische Behandlung von auftretenden Verunreinigungen über eine Sekundär- oder Transportleitung (9) zu genannten Sieben, Filtern od.dgl., nämlich ein Grobabscheidesieb (23), zu erzielen, dadurch gekennzeichnet, dass eine rotierende Trommel als Sieb benutzt wird für die Abscheidung von groben Verunreinigungen, im Anschluss woran genanntes Wasser durch Feinabscheidemittel (20) gefördert wird auf seinem Wege zu Abscheidungswasserkammern (19), von wo aus das gereinigte Wasser zu genannter Ejektordüse (17) zurückgefördert wird, dass das vorgereinigte Wasser durch einen Sammeltank (31) gefördert wird, von wo aus es an eine Feinabscheideeinheit (3) weitergepumpt wird, vorzugsweise unter Hinzufügen von chemischen Ausfällmitteln, insbesondere um Phosphor und möglicherweise ebenso Stickstoff auszufällen, und dass das vorgereinigte Wasser von der Aussenseite zur Innenseite eines Trommelfilters (20, 21, 24, 25) und von dort aus durch einen axialen Auslass (37) gefördert wird über einen Schacht (38) und einen Auslass (39) von genanntem Schacht zu einem Abscheidungswassertank (19), und dass der Abwasserpegel in genannter Feinabscheideeinheit (3) kontrolliert und angeschlossen wird an eine Reinigungsvorrichtung (41, 42, 47, 48, 49) für den Trommelfilter, um genannte Vorrichtung anzuschliessen und die Verbindung zu ihr zu unterbrechen. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Druck in der Ejektordüse (17), welcher von der Pumpe (22) erzeugt wird, angewendet wird, um das Verhältniss: Menge unter Druck gesetzten Wassers/Menge Abwasser und Schlamm/Hubhöhe stufenlos zu regulieren. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, wobei zu reinigende, abzuscheidende bzw. zu entfernende Schlämme und Abwässer von einem Abwasserbrunnen, einem Dreikammerklärbehälter od.dgl. (10) in einen LKW-Tank oder eine andere bewegliche oder stationäre Reinigungsvorrichtung (1) zum Hinaufpumpen vorgesehen sind, welche Vorrichtung Siebe (23) und/oder filter od.dgl. (20) zum Reinigen des herangepumpten Wassers besitzt, wobei das gereinigte Wasser zum fördern zu bzw. Lagern in einer Abscheidewasserkammer (19) vorgesehen ist, von welcher das Wasser mittels einer Pumpe (22) über eine primäre oder unter Druck gesetzte Wasserleitung (18) unter einem Druck von beispielsweise 5-10 bar an eine in genannten Brunnen od.dgl. (10) eingetauchte Ejektordüse (17) zu fördern und wiederzugewinnen ist, während es zusammen mit ungereinigtem Schlamm und Abwässern im Brunnen mitejektierbar ist, um unter anderem eine Verdünnung und eine mehr praktische Behandlung von auftretenden Verunreinigungen über eine sekundäre oder Transportleitung (9) zu genannten Sieben, Filtern od.dgl., nämlich einem Grobabscheidesieb (23), zu erzielen, dadurch gekennzeichnet, dass das letztere als rotierende Trommel für die Abscheidung von Verunreinigungen ausgeführt ist, auf welche Trommel Feinabscheidemittel (20) folgen, durch die genanntes Wasser, aus dem die groben Verunreinigungen entfernt wurden, zu fördern vorgesehen ist auf seinem Wege zu genannter Abscheidewasserkammer (19), aus der das gereinigte Wasser zu genannter Ejektordüse (17) rückführbar ist, dass das vorgereinigte Wasser zum fördern durch einen Sammeltank (31) vorgesehen ist, von wo es an eine Feinabscheideeinheit (3), vorzugsweise unter Hinzufügen von chemischen Ausfällmitteln, insbesondere zum Ausfällen von Phosphor und möglicherweise auch Stickstoff, vorgesehen ist, und dass das vorgereinigte Wasser zum fördern von der Aussenseite zur Innenseite eines Trommelfilters (20, 21, 24, 25) vorgesehen ist, welcher als Feinabscheidemittel wirksam eingesetzt ist und einen axialen Auslass (37) über einen Schacht (38) und einen Auslass (39) von genanntem Schacht zu einem Abscheidewassertank (19) besitzt, und dass der Abwasserpegel in genannter Feinabscheideeinheit (3) kontrollierbar und anschliessbar ist an eine Reinigungsvorrichtung (41, 42, 47, 48, 49) für den Trommelfilter zwecks Anschliessen genannter Vorrichtung und Unterbrechen dieses Anschlusses. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet dass genannte Grobabscheideeinheit (4) zum Beschicken einer Schlammpresse (5) mit dem abgeschiedenen groben Material vorgesehen ist, welche Presse mit Packmitteln für das entwässerte komprimierte grobe Material ausgestattet ist. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass genannte Feinabscheideeinheit (3) als Sedimentierbassin ausgefühit ist, in welchem ein Überlaufkasten (11) angeordnet ist, von wo aus eine Leitung oder mehrere Leitungen (12) durch geschlossene oder perforierte Wände (16) zu vorzugsweise seitlich angeordneten Abscheidewasserkammer, (19) führen, von wo aus Leitungen (14) über genannte Pumpe (22) zu genannter Druckwasserleitung (18) führen, während Leitungen (13) dazu vorgesehen sind, abgeschiedene Verunreinigungen vom unteren Teil genannten Sedimentierbassins zurückzufördern an genannte Grobabscheideeinheit und einer erneuten Grobabscheidebehandlung. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass ein Trommelfilter (20) in der Feinabscheideeinheit (3) angeordnet ist, welcher Filter eine Trommel (21) besitzt mit einer durchlässigen, z.B. perforierten Stützfläche (24), die mit Filtermaterial abgedeckt ist, welcher Trommelfilter dazu vorgesehen ist, radial von seiner Aussen- zu seiner Innenseite vorgereinigtes Wasser von der Grobabscheideeinheit (4) zu empfangen zwecks Feinabscheidung und Weiterfördern von auf diese Weise gereinigtem Wasser durch eine Hohlwelle (37) an einen vertikalen Schacht, der über einen Auslass (39) zu einer Abscheidewasserkammer (19) führt, und dass ausserhalb des Trommelfilters eine Reinigungsvorrichtung (41, 42) angeordnet ist, welche hauptsächlich Düsen (41) und eine Pumpe (42) besitzt zum Absaugen von Verunreinigungen von der Aussenseite des Trommelfilters und Weiterfördern derselben an die Grobabscheideeinheit, welche Reinigungsvorrichtung bevorzugt auch eine Düsenrampe aufweist und ein- bzw ausschaltbar ist mittels Pegelregulatoren (40, 45) im Schacht (38) und/oder in dem den Trommelfilter umgebenden Raum. Vorrichtung nach wenigstens einem der Ansprüche 3-6, dadurch gekennzeichnet, dass genanntes Trommelsieb (23) der Grobabscheideeinheit (4) eine perforierte Trommel (31) aufweist, die eine in ihrem Inneren befestigte Förderschraube (26) aufweist, welche Trommel nach unten geneigt ist in Richtung auf den Auslass der Transportleitung (9), welcher Auslass gleichzeitig der Einlass (27) des Trommelsiebes ist, wobei die Neigung 5-30°, bevorzugt etwa 15° beträgt, während der Auslass (28) der Trommel auf einem höheien Niveau dazu vorgesehen ist, abgeschiedene grobe Verunreinigungen abzugeben, die auf ihrem Wege zum Auslass (28) kontinuierlich entwässerbar sind, wobei das auf diese Weise erhaltene Wasser dazu vorgesehen ist, nach unten in einen Kessel (30) zu fliessen und zurückgepumpt zu werden an die Feinabscheideeinheit (3), bevorzugt über einen Sammeltank (54), welcher darunter angeordnet ist, mittels einer Pumpe (32), die in der Passage (8) zwischen den beiden Einheiten angeordnet ist, an welche Passage bevorzugt Leitungen (33, 34) und Pumpen (35, 36) angeschlossen sind, um Chemikalien aus solchen enthaltenden Behälter (6) zu fördern. Procédé pour éliminer la boue et purifier une eau usée qui sont pompées à partir d'une fosse contenant l'eau usée, d'une fosse septique à trois compartiments ou similaire (10), vers et dans un camion citerne ou un autre dispositif de purification (1) fixe ou mobile, l'eau qui est alimentée par pompage, étant amenée à passer à travers des tamis (23) et/ou des filtres ou similaires (20) en vue de sa purification, au moins une partie de cette eau, après avoir été passée à travers les tamis, filtres ou appareils similaires, étant alimentée sous pression, par exemple à une pression comprise entre 5 et 10 bars, au moyen d'une pompe (22), à travers un conduit d'eau primaire ou sous pression (18), vers et dans un éjecteur (17) qui est immergé dans la fosse ou conteneur similaire (10), et étant restockée, tandis que l'eau usée et la boue non purifiées présentes dans la fosse sont éjectées conjointement afin d'obtenir une dilution et un traitement plus pratique des impuretés apparaissant, à travers un conduit secondaire ou de transport (9), en direction des tamis, filtres ou appareils similaires notamment un tamis de séparation grossière (23), caractérisé en ce qu'un tambour rotatif est utilisé, en tant que tamis, pour le traitement des impuretés grossières, traitement après lequel l'eau est amenée à passer à travers un moyen (20) de séparation fine, sur son trajet en direction des compartiments (19) de l'eau de rejet à partir desquels l'eau purifiée est retournée vers l'éjecteur (17), en ce que l'eau prépurifiée est amenée à passer à travers une cuve collectrice (31) à partir de laquelle elle est pompée vers une unité de séparation fine (3), de préférence tout en ajoutant des agents chimiques de précipitation, en particulier pour provoquer la précipitation du phosphore et éventuellement aussi de l'azote, et en ce que l'eau prépurifiée est amenée à passer, à partir de l'extérieur d'un filtre tambour (20,21,24,25), vers et dans l'intérieur de ce filtre et à partir de celui-ci, vers l'extérieur, à travers un orifice de sortie axial (37), par l'intermédiaire d'un arbre (38) et d'un orifice de sortie (39) à partir de cet arbre, vers une cuve (19) d'eau de rejet, le niveau de l'eau usée dans l'unité de séparation fine (3) étant mesuré et transmis à un dispositif (41,42,47,48,49) de nettoyage du filtre tambour, afin de mettre en et hors service ce dispositif. Procédé suivant la revendication 1 caractérisé en ce que la pression dans l'éjecteur (17) qui est produite par la pompe (22), est utilisée pour ajuster progressivement le rapport entre la quantité d'eau sous pression et la quantité d'eau usée et le rapport entre la boue et la hauteur d'élévation. Dispositif pour la mise en oeuvre du procédé suivant la revendication 1 dans laquelle la boue et l'eau usée qui doivent être purifiées, séparées et évacuées respectivement, sont pompées à partir d'une fosse contenant l'eau usée, d'une fosse septique à trois compartiments ou d'un conteneur similaire (10), vers et dans un camion citerne ou un autre dispositif de purification (1), fixe ou mobile, qui comporte des tamis (23) et/ou des filtres ou des appareils similaires (20), prévus pour une purification du fluide fourni par la pompe, l'eau purifiée est fournie pour être alimentée et stockée respectivement dans un compartiment (19) d'eau de rejet, à partir duquel cette eau doit être alimentée sous pression, par exemple sous une pression comprise entre 5 et 10 bars, au moyen d'une pompe (22), par l'intermédiaire d'un conduit primaire ou d'eau sous pression (18), vers un éjecteur (17) qui est immergé dans la fosse ou dans le conteneur similaire (10), et elle doit être restockée tout en étant éjectée conjointement avec de la boue et de l'eau usée non purifiées présentes dans la fosse, afin d'obtenir une dilution et un traitement plus pratique des impuretés apparaissant, par l'intermédiaire d'un conduit secondaire de transport (9), vers les tamis, filtres ou appareils similaires, notamment vers un tamis (23) de séparation grossière, caractérisé en ce que ce dernier est un tambour rotatif pour la séparation des impuretés grossières, ce tambour étant suivi d'un moyen (20) de séparation fine destiné à être traversé par l'eau dont les impuretés grossières ont été éliminées, sur son trajet en direction du compartiment (19) de l'eau de rejet, à partir duquel l'eau purifiée doit être retournée vers l'éjecteur (17), en ce que l'eau prépurifiée est amenée à passer à travers une cuve collectrice (31) à partir de laquelle elle est pompée vers une unité de séparation fine (3), de préférence tout en ajoutant des agents chimiques de précipitation, en particulier pour provoquer la précipitation du phosphore et éventuellement aussi de l'azote, et en ce que l'eau prépurifiée est amenée à passer, à partir de l'extérieur d'un filtre tambour (20,21,24,25) intervenant en tant que moyen de séparation fine, vers et dans l'intérieur de ce filtre comportant un orifice de sortie axial (37), par l'intermédiaire d'un arbre (38) et d'un orifice de sortie (39) à partir de cet arbre, vers une cuve (19) d'eau de rejet, le niveau de l'eau usée dans l'unité de séparation fine (3) étant mesuré et transmis à un dispositif (41,42,47,48,49) de nettoyage du filtre tambour, afin de mettre en et hors service ce dispositif. Dispositif suivant la revendication 3 caractérisé en ce que l'unité de séparation grossière (4) est conçue de manière à alimenter une presse à boue (5) avec la matière grossière séparée, cette presse étant pourvue de moyens d'emballage pour la matière grossière comprimée et déshumidifiée. Dispositif suivant la revendication 3 caractérisé en ce que l'unité de séparation fine (3) est conçue en tant que bassin de sédimentation dans lequel est disposé un boîtier de trop-plein (11), à partir duquel un ou plusieurs conduits (12) aboutissent, à travers des parois fermées ou perforées (16), à des compartiments (19) contenant l'eau de rejet, disposés de préférence latéralement, et de ces compartiments partent des conduits (14) qui aboutissent, par l'intermédiaire de la pompe (22), au conduit d'eau sous pression (18), alors que des conduits (13) sont conçus pour faire passer les impuretés séparées à partir de la partie inférieure du bassin de sédimentation vers l'arrière, vers l'unité de séparation grossière, en vue d'un renouvellement du traitement de séparation grossière. Dispositif suivant la revendication 3 caractérisé en ce que dans l'unité de séparation fine (3) est monté un filtre tambour (20) qui comprend un tambour (21) ayant une surface formant support (24) perméable, par exemple perforée, recouverte d'un tissu filtrant, ce filtre tambour étant conçu de manière à recevoir, dans le sens radial de l'extérieur vers l'intérieur, l'eau prépurifiée provenant de l'unité de séparation grossière (4), pour réaliser une séparation fine et pour décharger l'eau, purifiée de cette façon, à travers un arbre creux (37), en direction d'un arbre vertical (38) qui aboutit, par l'intermédiaire d'un orifice de sortie (39), au compartiment (19) contenant l'eau de rejet, et en ce qu'à l'extérieur du filtre tambour est monté un dispositif de nettoyage (41,42) comprenant principalement des buses (41) et une pompe (42) pour aspirer les impuretés à partir de l'extérieur du filtre tambour et pour transporter ces impuretés vers l'unité de séparation grossière, ce dispositif de nettoyage comprenant aussi de préférence une rampe de buse et pouvant être mis ou non en service au moyen de commandes de niveau (40,45) prévues dans l'arbre (18) et/ou dans l'espace entourant le filtre tambour. Dispositif suivant l'une quelconque des revendications 3-6 caractérisé en ce que le tamis du type tambour (23) prévu dans l'unité de séparation grossière (4) comprend un tambour perforé (31) à l'intérieur duquel est fixée une vis d'alimentation (26), ce tambour est incliné vers le bas en direction de l'orifice de sortie du conduit de transport (9) qui est également l'orifice d'entrée (27) du tamis du type tambour, l'angle d'inclinaison allant de 5 à 30° et étant de préférence d'environ 15°, l'orifice de sortie (28) du tambour, se trouvant à un niveau plus élevé, est conçu de manière à décharger les impuretés grossières séparées qui doivent être continuellement déshumidifiées sur leur trajet en direction de l'orifice de sortie (28), l'eau récupérée de cette façon étant amenée à s'écouler vers le bas dans un conteneur (30) pour être repompée vers l'unité de séparation fine (3), avantageusement par l'intermédiaire d'une cuve collectrice (54) située en dessous, au moyen d'une pompe (32) montée dans le passage (8) entre les deux unités, passage auquel sont reliés de préférence des conduits (33,34) et des pompes (35,36) pour fournir des produits chimiques à partir de réservoirs (6) contenant ces produits chimiques.