DK172496B1

DK172496B1 - A method for removing and purifying sludge and wastewater and apparatus therefor

Info

Publication number: DK172496B1
Application number: DK199100513A
Authority: DK
Inventors: Bo Larsson; Ingemar Larsson
Original assignee: Bo Larsson; Ingemar Larsson
Priority date: 1988-09-27
Filing date: 1991-03-22
Publication date: 1998-10-19
Also published as: WO1990003474A1; NO911152L; NO309617B1; DK51391D0; NO911152D0; DE68905194D1; AU4326689A; DK51391A; SE8803405D0; EP0437465B1; EP0437465A1

Description

i DK PR 172496 B1in DK PR 172496 B1

Foreliggende opfindelse angår en metode til fjernelse og rensning af slam og spildevand ifølge indledningen til patentkrav 1. Foreliggende opfindelse angår også en indretning udformet til at fjerne og rense slam og spildevand ifølge det første indretningskrav.The present invention relates to a method for removing and purifying sludge and wastewater according to the preamble of claim 1. The present invention also relates to a device designed to remove and purify sludge and wastewater according to the first device claim.

5 Den moderne måde at behandle slam og spildevand er utilfredsstillende af flere årsager. Brønde til spildevand skal f.eks. tørrmes med mellemrum, som sædvanligvis gøres ved en såkaldt slamudsugning til en tankvogn, som derefter tømmer spildevandet i et stationært rensningsanlæg.5 The modern way of treating sludge and sewage is unsatisfactory for several reasons. Wells for wastewater, for example. is drained at intervals, which is usually done by a so-called sludge extraction to a tanker, which then empties the wastewater into a stationary treatment plant.

Sådanne transporter kan være meget tids- og energikrævende og eksiste-10 rende rensningsanlæg har ofte en begrænset kapacitet og derfor kan bortskaffelse af uregelmæssigt afhentet spildevand give problemer.Such transports can be very time and energy consuming and existing wastewater treatment plants often have a limited capacity and therefore disposal of irregularly collected wastewater can cause problems.

Derfor er formålet med foreliggende opfindelse at skabe muligheder for en mindre tids- og energikrævende behandling af spildevand. Et andet formål med opfindelsen er at fremme udviklingen indenfor dette område 15 på flere andre måder.Therefore, the object of the present invention is to provide opportunities for a less time and energy consuming treatment of wastewater. Another object of the invention is to promote the development in this field 15 in several other ways.

Disse formål opnås ifølge foreliggende opfindelse ved udførelse af en metode af den type som foreslået i Indledningen på den måde som det fremgår af den kendetegnende del af patentkrav 1. Nævnte formål opnås også ved hjælp af en indretning, son hovedsagelig er udformet på den 20 måde son beskrevet i det første indretningkrav.These objects are achieved according to the present invention by carrying out a method of the type as proposed in the Introduction in the manner as is apparent from the characterizing part of claim 1. Said object is also achieved by means of a device which is mainly designed in the manner as described in the first device requirement.

Yderligere kendetegn og fordele ved opfindelsen er beskrevet i den følgende beskrivelse med henvisning til vedlagte tegning, som skematisk viser foretrukne udførelsesformer udformet til at gennemføre metoden ifølge opfindelsen og af indretningen ifølge opfindelsen. Tegningen 25 viser:Further features and advantages of the invention are described in the following description with reference to the accompanying drawings, which schematically show preferred embodiments designed to carry out the method according to the invention and of the device according to the invention. The drawing 25 shows:

Fig. 1 en første udførelsesfonn af en mobil indretning ifølge opfindelsen, set fra siden,FIG. 1 is a side view of a first embodiment of a mobile device according to the invention;

Fig. 2 en anden udførelsesform af en sådan indretning, set fra siden,FIG. 2 is a side view of another embodiment of such a device;

Fig. 3 en tredie også foretrukken udførelsesform af en sådan indret-30 ning, set fra siden,FIG. 3 is a side view of a third preferred embodiment of such a device,

Fig. 4 indretningen ifølge fig. 3, set fra oven, DK PR 172496 B1 2FIG. 4 the device according to FIG. 3, top view, DK PR 172496 B1 2

Fig. 5 en perspektiv tegning af en tromlesigte, som er en komponent i ihvertfald nogle af de ovennævnte indretninger,FIG. 5 is a perspective view of a drum screen which is a component of at least some of the aforementioned devices,

Fig, 6 et tromlefilter, set fra siden, som er en komponent i ihvertfald nogle af de ovennævnte indretninger og 5 Fig, 7 en udsprøjtningsdyse, set fra siden, soti er en komponent i nævnte indretninger.Fig. 6 is a side view of a drum filter which is a component of at least some of the aforementioned devices and Fig. 7 is a side view of an injection nozzle, soi is a component of said devices.

I fig. 1 vises en indretning 1, som f.eks. er mobil, især en tankvogn, på platformen 2 hvor en enhed 4 til retningsadskillelse og en enhed 3 til finadskillelse er monteret. Det ydre af den sidstnævnte kan være 10 udformet som et sedimenteringsbassin, mens den førstnævnte omfatter et filter 23 og en slampresse 5. En tank 6 kan monteres under enhed 4 ligesom fordelingsudstyr, ikke vist i detaljer, til udfældningskemika-lier. Slampressen og sigten er forbundne med hinanden igennem en kanal 7 og sigten og enhed 3 igennem en kanal 8, mens en trykvands ledning 15 18 er forbundet til en brønd 10, som indeholder slam og spildevand og en transportledning 9 forbinder brønden til enhed 4. I sedimenteringsbassinet er der anbragt en skitavleboks 11, fra hvilken en eller flere ledningskanaler 12, igennem lukkede eller perforerede skillevægge 16,leder til fortrinsvis sidelæns anbragte nedre områder af bassinet, 20 nemlig det såkaldte affaldsvandkammer 19, fra hvilket en eller flere ledningskanaler 14 via en pumpe 22 leder til trykvands1edning 18, mens en eller flere ledningskanaler 13 er udformet til at transportere udskilte lirenheder tilbage til enhed 4. Hele processen kan fjernstyres ved hjælp af en radiostyringsenhed 15.In FIG. 1, a device 1 is shown, such as e.g. is mobile, especially a tanker, on the platform 2 where a directional separation device 4 and a fine separation device 3 are mounted. The exterior of the latter may be 10 formed as a sedimentation basin, the former comprising a filter 23 and a sludge press 5. A tank 6 may be mounted under unit 4, like distribution equipment, not shown in detail, for precipitation chemicals. The slurry press and screen are connected to each other through a channel 7 and the screen and unit 3 through a channel 8, while a pressurized conduit 15 18 is connected to a well 10 containing sludge and sewage and a conveyor line 9 connects the well to unit 4. In the sedimentation basin, there is arranged a skitboard box 11, from which one or more conduit channels 12, through closed or perforated partitions 16, lead to preferably laterally arranged lower regions of the basin 20, namely the so-called waste water chamber 19, from which one or more conduit channels 14 22 leads to pressurized water conduit 18, while one or more conduit ducts 13 are designed to transport separated clay units back to unit 4. The entire process can be remotely controlled by a radio control unit 15.

25 En foretrukken arbejdscyklus udføres på følgende måde: Renset vand fra kamrene 19 pumpes ved hjælp af pumpe 22 via ledningskanaler 14 og 18 til en udsprøjtningsdyse 17, som er anbragt i den frie ende af den sidstnævnte ledningskanal og nedsænket f.eks. i en trekamret septiktank og i hvilken det trykregulerede vand indsprøjtes i indløbet af 30 ledningskanal 9, en stærk sugevirkning opnås, som tradeker spildevandet og slaitmet i brønden op, som derefter transporteres til retningsadskillelsesenhed 4, som kan være udformet som vist i fig. 5 og er beskrevet mere detaljeret i det følgende. I enhed 4 er sigten for- DK PR 172496 B1 3 trinsvis udformet som en roterende tromle 23. Spildevandet, fra hvilket grove urenheder er blevet fjernet i enhed 4, det vil sige det forrensede spildevand, transporteres derefter til enhed 3. På dets vej kan passende bundfældningskemikalier tilsættes for at bundfælde f.eks.A preferred duty cycle is carried out as follows: Purified water from the chambers 19 is pumped by means of pump 22 via conduit channels 14 and 18 to an injection nozzle 17 located at the free end of the latter conduit and submerged e.g. In a three-chamber septic tank and in which the pressure-regulated water is injected into the inlet of conduit 9, a strong suction effect is obtained, which dissipates the wastewater and sludge in the well, which is then transported to the directional separation unit 4, which may be formed as shown in FIG. 5 and are described in more detail below. In unit 4, the sieve is gradually formed as a rotating drum 23. The waste water from which coarse impurities have been removed in unit 4, i.e. the purified waste water, is then transported to unit 3. suitable precipitation chemicals are added to precipitate e.g.

5 fosfor og sandsynligvis også kvælstof, som tilsætning til det opslaan-mede materiale, fra spildevandet. Bundfældningen af det flokkulere materiale skal ske hurtigt og derfor er en turbulens i nogen udstrækning i ledningskanalen til finadskillelsesenheden nødvendig.5 phosphorus and probably also nitrogen, as an addition to the stored material, from the wastewater. Precipitation of the flocculent material must occur rapidly and therefore some turbulence is required to some extent in the conduit of the fin separator.

Vandet ledes derefter ind i den centrale del af enhed 3, i hvilken det 10 flokkulerede materiale kan gå ned til bunden og i hvilken vandet, som på denne måde er blevet renset i større grad, kan flyde over fra ski-tavleboks 11 for at blive ført, igennem de sidelæns vægge 16, fortrinsvis kun via ledningskanaler 12, til affaldsvandkamrene. Det rensede vand bruges, som tidligere nævnt, til at drive udsprøjtningsindretnin-15 gen. Overskudet kan returneres til brønden. Det er f.eks. muligt at tømme og rense hele indholdet af en brønd og derefter eller fortløbende bringe det rensede vand tilbage. Ordet "fortløbende" betyder, at genfyldningen af renset vand kan gøres også inden slamsugningsfunktionen er afsluttet. Grove urenheder opsamlet i tromlesigten og kemisk 20 slam bragt tilbage til tromlesigten er koncentreret og bragt til slampressen, som fortrinsvis aktiveres samtidigt son tromlesigten, og derefter køres slampressen med mellemrum. Det komprimerede affaldsmateriale kan indsamles i f.eks. plastic sække og trykvandet kan genbruges i processen.The water is then fed into the central portion of unit 3, in which the flocculated material can go to the bottom and in which the water, which has thus been purified to a greater extent, can flow from the chalkboard 11 to become passed through the sidewalls 16, preferably only via conduit 12, to the waste water chambers. The purified water is used, as previously mentioned, to drive the spray device. The surplus can be returned to the well. It is e.g. it is possible to empty and purify the entire contents of a well and then or continuously bring back the purified water. The word "continuous" means that the refilling of purified water can be done even before the sludge suction function is completed. Rough impurities collected in the drum screen and chemical sludge brought back to the drum screen are concentrated and brought to the slurry press, which is preferably activated simultaneously with the drum screen, and then the slurry press is run at intervals. The compressed waste material can be collected in e.g. plastic bags and pressurized water can be recycled in the process.

25 Det er allerede nævnt, at dele i de forskellige figurer og tidførelsesformer kan udskiftes eller blive kombineret på vilkårlig måde.25 It has already been mentioned that parts of the various figures and forms of timing can be exchanged or combined in any way.

Udførelsesformen vist i fig. 2 ligner den tidligere nævnte. Dog er finadskillelsen ikke udført via en skitavleboks, men er udført ved hjælp af en tromlesigte 20. Tromlesigten omfatter en tranle 21 med en 30 gennemtrængelig, f.eks. perforeret bæreflade 24, som er dækket af en filterdug 25. Spildevandet, med al dets slam og al dets urenheder, flyder dog først til tromlesigte 23, som ifølge fig. 5 omfatter en DK PR 172496 B1 4 perforeret tromle 31 med en indvendigt fastgjort fødeskrue 26. Tromlen hælder imod indløbet 27 med f.eks. 5-30°, fortrinsvis omkring 5°, mens ubløb 28, i et højere niveau, er udformet til at udføre separerede grove urenheder, eller såkaldt slam, som på dets vej til udløbet 5 afvandes fortløbende og derefter falder ud igennem en samletragt 29, som er anbragt under udløbet, fra hvilket det transporteres videre, f.eks. ved tyngdekraft, til slampresse 5, i hvilken en automatisk afvanding finder sted og en såkaldt bunke bliver opbygget, som derefter bliver indsamlet i f.eks. plastic sække. Affaldsvandet fra slampres-10 sen og også vand, scan flyder igennem tromlesigten, bliver indsamlet, f.eks. i en beholder 30 under tromlesigten og pumpes tilbage til enhed 3, fortrinsvis via en indsamlingstank, som er anbragt under enhed 3, ved hjælp af en pumpe 32, som er anbragt i kanal 8. Kanal 8 kan være forbundet til ledningskanaler 33, 34 fra doseringsindretninger, ik-15 ke vist, til kemikalier af den slags tidligere nævnt, som bliver tilført fra tanke 6, som allerede nævnt. En pumpe 35, 36 kan være anbragt i hver af ledningskanaleme 33 og 34 respektive og hører til doseringsindretningen, som der ikke er vist yderligere af, men den er i princippet kendt.The embodiment shown in FIG. 2 is similar to that previously mentioned. However, the fin separation is not carried out via a skit board, but is carried out by means of a drum screen 20. The drum screen comprises a drum 21 with a permeable, 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, first flows to drum screen 23, which according to FIG. 5 comprises a DK PR 172496 B1 4 perforated drum 31 with an internally attached feed screw 26. The drum slopes against the inlet 27 with e.g. 5-30 °, preferably about 5 °, while higher-level wafer 28 is designed to perform separated coarse impurities, or so-called sludge, which on its way to the outlet 5 is dewatered continuously and then falls out through an aggregate 29, which is disposed below the outlet from which it is transported further, e.g. by gravity, to sludge press 5, in which an automatic dewatering takes place and a so-called pile is built up, which is then collected in e.g. plastic bags. The waste water from the sludge press and also water, scan flowing through the drum screen, is collected, e.g. in a container 30 under the drum screen and pumped back to unit 3, preferably via a collection tank placed under unit 3, by means of a pump 32 located in channel 8. Channel 8 can be connected to conduits 33, 34 from dispensers, not shown, for chemicals of the kind previously mentioned which are supplied from tank 6, as already mentioned. A pump 35, 36 may be disposed in each of the conduits 33 and 34 respectively and belong to the metering device, of which no further indication is shown, but it is known in principle.

20 Selvom tromlefiltret i fig. 3 er anbragt med dets længderetning lodret i forhold til længderetningen af køretøjet eller lignende, son bærer renseindretningen, i fig. 2 er det anbragt i længderetningen af køretøjet. Hovedkonstruktionen kan dog være den samme. Det er vist i fig.20 Although the drum filter of FIG. 3 is arranged with its longitudinal direction vertical with respect to the longitudinal direction of the vehicle or the like, which carries the cleaning device, in fig. 2, it is arranged in the longitudinal direction of the vehicle. However, the main structure may be the same. It is shown in FIG.

3, at det grovrensede vand, ved hjælp af en pumpe, pumpes fra beholder 25 31 til enhed 3, som hele vejen rundt er udformet son en hovedsagelig lukket beholder, i hvilken det grovrensede vand omgiver tromlefiltret og passerer igennem dets dug og perforeringer, hvor fine faste eller halvflydende partikler bliver separeret. Vandet, som er blevet filtreret på denne måde, flyder derefter fra det indre af tromlefiltret via 30 en hulaksel 37, som er anbragt for enden af filtret, og en vertikal aksel 38 (se også fig. 6), op til et udløb 39 og bliver udtømt i en affaldsvandtank 19. Akkumuleringen af partikler på filterdugen reducerer gennemtrængeligheden af dugen og vandoverflade niveauet i enhed 3, som også kan kaldes et filterkammer, øges. Når maksimum niveauet 40 DK PR 172496 B1 5 er nået, påvirkes en niveauregulator og aktiverer, på mekanisk eller fortrinsvis elektronisk vis, en filterrenseproces, som gøres ved en udsugping med en dyse Al, som er i forbindelse med tromlen ved hjælp af en rampe langs hele tromlen, hvor fastsiddende partikler bliver 5 suget vak ved hjælp af en pumpe A2 men også angivende vand og selv vand fra det indre af tranlen, som er suget igennem dugen, som på denne bliver renset effektivt. Denne udsugede blanding kan, via et gennemløb A3, føres tilbage til enhed A. Da tromlen, som er drevet af en motor AA, roterer under rensningsfasen, opnås en meget effektiv 10 rensning. Ved hjælp af en speciel filterdug, tidligere kendt, er det muligt, når en filtrering er gennemført, efter en kemisk bundfældning, at separere meget små partikler, f.eks. jern og aluminium fosfat, er det muligt at opnå så lavt som 0,2 mg/1 totalt fosfor og 5 mg/1 opslæn-met substans. Dugens struktur gør det muligt også at separere partik-15 ler med en meget lille mekanisk fasthed og stabilitet. Qi filterdug med de beskrevne ønskede egenskaber kan købes på markedet under varebetegnelsen MEKANAFILTER TYP 102.3 shows that, by means of a pump, the coarse-purified water is pumped from container 25 31 to unit 3, which is formed all the way around a substantially closed container, in which the coarse-purified water surrounds the drum filter and passes through its dew and perforations, fine solid or semi-liquid particles are separated. The water which has been filtered in this way then flows from the interior of the drum filter via a hollow shaft 37 located at the end of the filter and a vertical shaft 38 (see also Fig. 6) up to an outlet 39 and being discharged into a waste water tank 19. The accumulation of particles on the filter cloth reduces the permeability of the tablecloth and the water surface level in unit 3, which can also be called a filter chamber, is increased. When the maximum level 40 DK PR 172496 B1 5 is reached, a level regulator is actuated and activates, mechanically or preferably electronically, a filter cleaning process which is done by a suction with a nozzle A1, which is connected to the drum by means of a ramp along the entire drum, where stuck particles are sucked by a pump A2 but also indicating water and even water from the interior of the drum, which is sucked through the tablecloth which is effectively cleaned thereon. This extracted mixture can, via a passage A3, be returned to unit A. As the drum, driven by a motor AA, rotates during the cleaning phase, a very efficient cleaning is achieved. By means of a special filter cloth, previously known, it is possible, when a filtration has been carried out, after a chemical precipitation, to separate very small particles, e.g. iron and aluminum phosphate, it is possible to obtain as low as 0.2 mg / l total phosphorus and 5 mg / l suspended substance. The fabric structure also allows particles to be separated with a very small mechanical strength and stability. Qi filter cloth with the desired characteristics described can be purchased on the market under the trade name MEKANAFILTER TYPE 102.

Endvidere er der i fig. 6 vist et minimum niveau A5, når dette niveau nås, kan rense indretningen stoppes, mens et sikkerhedsudløb A6 kan be-20 nyttes, såfremt udløb 39 er blokeret. Det vises i fig. 3 at dyse Al eller pumpe A2 har en arm A7, som strækker sig nedad til området under tromlen. Denne arm er en hjælpedyse, fortrinsvis i form af en rampe, beregnet til at opsuge ophobninger af urenheder under tromlen.Furthermore, in FIG. 6, when this level is reached, the cleaning device can be stopped, while a safety outlet A6 can be used if outlet 39 is blocked. It is shown in FIG. 3, nozzle A1 or pump A2 has an arm A7 extending downwardly to the area under the drum. This arm is an auxiliary nozzle, preferably in the form of a ramp, designed to absorb accumulations of impurities under the drum.

Denne hjælpedyse kan passende være forbundet separat. Dyse Al kan være 25 fastgjort og indstillet i forskellige positioner ved hjælp af holdere A8 respektive A9.This auxiliary nozzle may conveniently be connected separately. Nozzle A1 can be fixed and adjusted in different positions by means of holders A8 and A9 respectively.

Ved hjælp af dysen vist i fig. 7 kan følgende ydelser opnås:Using the nozzle shown in FIG. 7, the following benefits can be obtained:

Tryk i dyse (¾ (tø (tø + (tø Løfte højde 5 bar 210 1 210 1 A20 1 10 m 30 7 bar 250 1 290 1 5A0 1 10 m 10 bar 295 1 A75 1 770 1 10 mPressure in nozzle (¾ (thaw) (thaw + (thaw) Lift height 5 bar 210 1 210 1 A20 1 10 m 30 7 bar 250 1 290 1 5A0 1 10 m 10 bar 295 1 A75 1 770 1 10 m

Den største fordel ved denne kombinerede tryk og suge virkning er, at DK PR 172496 B1 6 store løftehøjder kan let opnås, at ingen pumpestop vil forekomme og at ønskede kombinationer af tryk i dyse/mængde af trykreguleret vand/ mængde af spildevand eller slam/løftehøjde kan let og trinløst opnås.The main advantage of this combined pressure and suction effect is that DK PR 172496 B1 6 high lift heights can easily be achieved, that no pump stop will occur and that desired combinations of nozzle pressure / amount of pressure regulated water / amount of waste water or sludge / lift height can be easily and infinitely achieved.

Fig. 7 viser, at dyse 17 er forsynet med holdere til ledningskanaler 5 9 og 18, den førstnævnte har en større diameter for at indeholde de to typer af medium, det vil sige trykreguleret vand (tø og spildevandsslam (tø. Dyse 17 har en strålespids 51. Denne strålespids er forsynet med omgivende ydre begrænsninger, som kan være perforerede eller have sigtevæv. De karakteristiske kendetegn beskrevet ovenfor og vist i 10 tegningen er kun ikke-begrænsende udførelsesfonner af opfindelsen, som kan ændres og suppleres på vilkårlig måde indenfor rammerne af opfindelsesideen og de følgende patentkrav. På grund af dette vidsprøjtningsprincip det vil sige en fortyndning og en mere praktisk behandling af opståede urenheder opnås.FIG. 7 shows that nozzle 17 is provided with holders for conduits 5 9 and 18, the former having a larger diameter to contain the two types of medium, i.e. pressure controlled water (thaw and sewage sludge (thaw. Nozzle 17 has a jet tip 51). This jet tip is provided with ambient external constraints which may be perforated or have sieve tissue.The characteristic features described above and shown in the drawing are only non-limiting embodiments of the invention which may be modified and supplemented in any way within the scope of the invention idea and Due to this widespread principle, that is, a dilution and a more practical treatment of the impurities that have arisen are obtained.

Claims

A method for removing and purifying sludge and wastewater pumped up from a sewage well, a three-chamber septic tank or the like (10) and into a tanker or other mobile or stationary purifier (1), the medium which being fed by pumping, being passed through sieves (23) and / or filters or the like (20) to clean it, at least part of said medium, after passing said sieves, filters or the like, by means of a pump (22) via a primary or pressure regulated water conduit (18) is supplied under high pressure, e.g. between 5 and 10 bar, into an injection nozzle (17) which is submerged in said well or the like (10) and returned, while uncleaned sludge and wastewater from the well are sprayed to obtain a dilution and more. practical treating of impurities, via a secondary or conveying conduit (9) for said screens, filters or the like, namely, a coarse separation screen (23), characterized in that the latter is designed as a rotating drum, to treat coarse impurities, and it is followed by fine separation means (20) passed by the medium, after the removal of its coarse impurities, on its way to the waste water chambers (19), from which the purified medium is returned to said spray nozzle (17 ) that the purified medium passes through an assembly tank (31) from which it is pumped to a fine separation unit (3), preferably while adding chemical precipitate preparations, especially to precipitate phosph. and and probably also nitrogen, and that the purified medium passes from the outer into the interior of a drum filter (20, 21, 24, 25) with an axial outlet (37), via a shaft (38) and an outlet ( 39) from said shaft to a waste water tank (19), the waste water level in said fine separation unit (3) is measured and connected to a cleaning device (41, 42, 47, 48, 49.) of the drum filter to connect and disconnect said device.

A method according to claim 1, characterized in that the pressure in the spray nozzle (17) produced by the pump (22) is used to steplessly control the conditions: amount of pressure controlled DK PR 172496 B1 water / amount of waste water and sludge / lifting height.

A device designed to carry out the method of claim 1, wherein the sludge and wastewater to be purified and separated and removed are pumped up from a sewage well, a three-chamber septic tank or the like (10) and into a tanker or a second mobile or stationary cleaning device (1) comprising screens (23) and / or filters or the like (20) designed to purify the pumped medium, the purified medium is respectively intended to be fed and stored in a waste water chamber (19), from which the aggregate 10 is supplied by means of a pump (22), via a primary or pressure regulated water conduit (18), high pressure peaks, e.g. between 5 and 10 bar, to an injection nozzle (17) immersed in said well or the like (10) and returned while spraying the well with uncleaned sludge and effluent from the well to obtain a dilution and a more convenient treatment of impurities, via a secondary or transport conduit (9) for said screens, filters or the like, namely a coarse separation screen (23), characterized in that the latter is designed as a rotary drum for the treatment of coarse impurities, and conductive for fine separating means 20 (20) to be passed by said medium from which the coarse impurities have been removed, on its way to said waste water chamber (19), from which the purified medium must be brought back to said spray nozzle (17), that the purified medium must pass through an assembly tank (31) from which it is pumped to fine separation unit (3), preferably while adding chemical precipitating preparations, in particular to precipitate phosphorus and probably also nitrogen, and for the purified medium to pass from the outer to the interior of a drum filter (20, 21, 24, 25) which is effective as fine separation agents and which has an axial outlet ( 37), via a shaft (38) and an outlet 30 (39) from said shaft to a waste water tank (19), the wastewater level in said fine separation unit (3) is measured and connected to a cleaning device (A1, A2, A7, 48, 49 ) to the drum filter to connect and disconnect said device. DK PR 172496 B1

Device according to claim 3, characterized in that said coarse separation unit (4) is designed to supply a sludge press (5) the separated coarse material, which press is provided with packing options for the dewatered compressed coarse material.

Device according to claim 3, characterized in that said fine separation unit (3) is formed as a settling pool, in which a ski board box (11) is arranged, from which one or more conduit channels (12), through closed or perforated walls (16). ) leads to preferably laterally disposed waste water chambers (19), from which conduit (14), via said pump (22), leads to said pressurized conduit (18), while conduit (13) is designed to supply separated impurities from the lower part of said settling pool 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 arranged in a fine separation unit (3), said filter comprising a drum (21) having a permeable, e.g. perforated support surface (24), covered by a filter cloth, preferably of the type MEKANAFILTER TYPE 102, which drum filter is designed to receive radially 20 from its outer and its interior to receive purified medium from coarse separating unit (4) for a fine separation and to discharge the medium, cleaned in this way, through a hollow shaft (37) to a vertical shaft (38) leading via an outlet (39) to the waste water chamber (19), and outside the drum filter is a cleaning device (41, 42), generally comprising nozzles. (41) and a punch (42) for extracting impurities from the exterior of the drum filter and transporting the same to coarse separating unit, which preferably comprises a nozzle ramp and can be connected and interrupted by level regulators (40, 45) in the shaft ( 38) and / or in the region surrounding the drum filter.

Device according to any one of claims 3-6, characterized in that said drum screen (23) in the coarse separating unit (4) comprises DK PR 172496 B1 a perforated drum (31) with a feed screw (26) fixed in its interior, which drum inclined downwardly toward the outlet of the conveyor duct (9), which outlet is also the inlet (27) of the drum sieve, by 5 ° -30 °, preferably about 15 °, while the outlet (28) of the drum, at a higher 5 level, is formed for discharging separated coarse impurities which are continuously dewatered on their way to the outlet (28), the water thus obtained is intended to flow downwardly into a container (30) and be pumped back to the fine separation unit (3), suitably via an assembly tank (54) disposed below, by means of a pump (32), placed in the passage (8) between the two units, to which passage is preferably conduit ducts (33, 34) and pumps (35, 36) connected to supply chemicals from tanks (6) containing boards tea chemicals.

A device according to any one of claims 3-7, characterized in that the pump (22) arranged in the pressurized water duct (18) can be adjusted to the water pressure generated in the spray nozzle (17) to obtain a desired combination: amount of pressure controlled water / amount of sewage and sludge / lift height, and / or by a radio control unit (15) designed to perform various functions, e.g. starting the conduit duct drum with the injection pump (22), the extraction of impurities from the drum filter and the interrupted operation of the sludge press (5) just as the waste water flow and the pump effluent of the waste water are exceeded.