DK148901B

DK148901B - APPLIANCE FOR WATER CLEANING AND / OR WATER AIR FLOWING

Info

Publication number: DK148901B
Application number: DK024780AA
Authority: DK
Inventors: Karl Horst Reinhardt; Heinz Joachim Mueller
Original assignee: Geesthacht Gkss Forschung
Priority date: 1979-09-21
Filing date: 1980-01-22
Publication date: 1985-11-11
Also published as: HU182096B; JPH0329475B2; ATE1666T1; EP0025813A1; EP0025813B1; PL223540A1; DE2938264C2; JPS5648288A; PL124739B1; DD149656A5; CS215043B2; DE2938264A1; DK148901C; DK24780A

Abstract

1. Apparatus for water purification and/or aeration by saturation of the raw water with pressurized gas and subsequently allowing it to depressurize in a floating vessel characterized in that upstream to the flotation vessel (3) there are provided in series a first injector pump (1), a feed pump (4) and a second injector pump (2), and that the product water outlet (35) of the flotation vessel (3) through a throttle valve (39) is connected with the driving medium inlet (11) of the first injector pump (1), the suction inlet of which being designed as a gas suction inlet and the outlet of which feeds the driving medium inlet (21) of the second injector pump (2), the suction inlet (23) of the latter being designed as a raw water inlet.

Description

i 148901in 148901

Opfindelsen angår et apparat til vandrensning og/eller vandbeluftning ved mætning af vandet med en under tryk stående gas med påfølgende tryksænkning i en flotationsbeholder .The invention relates to an apparatus for water purification and / or water aeration by saturating the water with a pressurized gas with subsequent pressure lowering in a flotation vessel.

5 Pra beskrivelsen til svensk patent nr. 58 314 kendes et apparat af denne art, hvori der indgår en cirkulationspumpe samt en strålepumpe, der indsuger luft og derved frembringer små luftblærer i råvandet, der derefter føres til flotationsbeholderen. Med dette kendte apparat kan man 10 imidlertid ikke opnå den ønskede lille luftblærestørrelse på ca. 50 mikrometer, der giver optimal fraskillelse af urenheder i flotationsbeholderen.5 From the description of Swedish Patent No. 58,314, an apparatus of this kind is known, which includes a circulation pump as well as a jet pump which injects air and thereby produces small air bubbles in the raw water, which is then fed to the flotation vessel. However, with this known apparatus 10 the desired small air bladder size of approx. 50 microns, giving optimum separation of impurities in the flotation vessel.

Opfindelsen har til formål at anvise et apparat af den angivne art, der kan frembringe luftblærer i råvandet af den 15 ønskede lille størrelse, således at der med nogenlunde samme effektforbrug fås en langt mere effektiv fraskillelse af urenheder i flotationsbeholderen.The invention has for its object to provide an apparatus of the kind specified which can produce air blisters in the raw water of the desired small size, so that with substantially the same power consumption a much more efficient separation of impurities is obtained in the flotation vessel.

Dette er ifølge opfindelsen opnået ved, at der i serieforbindelse med hinanden, regnet i strømningsretning mod flo-20 tationsbeholderen, er anordnet en første strålepumpe, en cirkulationspumpe og anden strålepumpe, og at rentvandsud-løbet fra flotationsbeholderen gennem et drøvlested er forbundet med drivmiddelindløbet til den første strålepumpe, at sugetilslutningen på den første strålepumpe er udformet 25 som en studs til indsugning af gassen, at udløbet fra den første strålepumpe er forbundet med drivmiddelindløbet til den anden strålepumpe, og at sugetilslutningen til den anden strålepumpe er udformet som en studs til indsugning af råvand.This is achieved by the invention in that a first jet pump, a circulation pump and a second jet pump are arranged in series with each other, in flow direction towards the float tank, and that the clean water outlet from the flotation tank is connected to the propellant inlet through a throttle inlet. the first jet pump, the suction connection of the first jet pump is designed as a gas inlet for the gas, the outlet of the first jet pump is connected to the fuel inlet of the second jet pump, and the suction connection to the second jet pump is designed as a suction outlet of raw water.

30 I den første strålepumpe fyldes den fraskilte del- af det rene vand med luftblærer, og efter passage af den anden strålepumpe, der ansuger råvandet, er trykket så højt i vandet, at luftblærerne er mikroskopisk små, idet vandet nu er mættet med opløst luft, medens vandet imellem de to 148901 2 strålepumper er overmættet med luft i form af luftblærer.30 In the first jet pump, the separated part of the pure water is filled with air vesicles, and after passage of the second jet pump which sucks the raw water, the pressure is so high in the water that the vesicles are microscopically small, since the water is now saturated with dissolved air. while the water between the two jet pumps is supersaturated with air in the form of air blisters.

En yderligere fordel ved apparatet ifølge opfindelsen består i, at effektforbruget er relativt lavt, fordi den til opbygning af trykket efter den første strålepumpe anvendte 5 energi delvis genvindes i den anden strålepumpe, der ansuger råvandet.A further advantage of the apparatus according to the invention is that the power consumption is relatively low because the energy used to build up the pressure after the first jet pump is partially recovered in the second jet pump which sucks the raw water.

Det har vist sig, at rensningsvirkningen kan forbedres yderligere, hvis ifølge opfindelsen flotationsbeholderen er konisk udformet og indeholder et nedefra og opad forløbende 10 standrør, der er forbundet med udløbet fra den anden strålepumpe, medens flotationsbeholderen forneden er udformet som en standrøret relativt snævert omsluttende cylindrisk del med et udløb for det rensede vand. Herved kan ifølge opfindelsen flotationsbeholderen i en øvre kuppelformet del 15 være forsynet med et udløb for det fraskilte materiale.It has been found that the purification effect can be further enhanced if, according to the invention, the flotation vessel is conically formed and contains a bottom and upwardly extending standpipe connected to the outlet of the second jet pump, while the flotation vessel below is designed as a standpipe relatively narrowly cylindrical. part with an outlet for the purified water. Hereby, according to the invention, the flotation container in an upper dome-shaped part 15 can be provided with an outlet for the separated material.

Opfindelsen vil blive beskrevet nærmere i det følgende under henvisning til tegningen, der skematisk viser et apparat ifølge opfindelsen.The invention will be described in more detail below with reference to the drawing which schematically shows an apparatus according to the invention.

Det på tegningen viste apparat har en første strålepurape 1, 20 en anden strålepumpe 2, en flotationsbeholder 3 og en cirkulationspumpe 4.The apparatus illustrated in the drawing has a first jet tape 1, a second jet pump 2, a flotation tank 3 and a circulation pump 4.

Flotationsbeholderen 3 har en øvre, dels cylindrisk, dels konisk del 31, hvortil der forneden slutter sig en snævrere cylindrisk del 32. Ind i den nederste del af flotations-25 beholderen 3 rager et standrør 33, hvortil den væske, der skal renses, føres gennem en tilslutning 34. Denne væske er ’ fyldt med gasblærer. Fra den nederste cylindriske del 32 af flotationsbeholderen 3 strømmer det rensede vand ud gennem et udløb 35. Gennem et i den øverste del af flotationsbe-30 holderen 3 anordnet udløb 36 kan de fraskilte fremmedstoffer S udsuges ved hjælp af en ikke vist pumpe.The flotation container 3 has an upper, partly cylindrical and partly conical part 31, to which a narrower cylindrical part 32. is joined below. A standpipe 33 is projected into the lower part of the flotation container 3, to which the liquid to be cleaned is fed. through a connector 34. This fluid is' filled with gas blisters. From the lower cylindrical portion 32 of the flotation vessel 3, the purified water flows out through an outlet 35. Through an outlet 36 arranged in the upper part of the flotation vessel 3, the separated foreign matter S can be extracted by means of a pump not shown.

Fra udløbet 35 strømmer den rensede væske gennem en ledning 37, og gennem en grenledning 38 hertil strømmer en del af 148901 3 det rensede vand gennem et drøvlested 39 til drivmiddelindløbet 11 til den første strålepumpe 1. Sugesiden af strålepumpen 1 står gennem en sugetilslutning 13 i forbindelse med den til flotationen nødvendige gas, fortrinsvis renset 5 luft L. Denne luft opløses i væsken ved hjælp af det af strålepumpen 1 opbyggede tryk. Strømningen gennem den første strålepumpe 1 vedligeholdes af cirkulationspumpen 4, og udløbet 12 fra den første strålepumpe 1 står i forbindelse med drivmiddelindløbet 21 til den anden strålepumpe 2, hvis sugeside 10 gennem en sugetilslutning 23 modtager det råvand RW, der skal renses. Udløbet 22 fra denne anden strålepumpe 2 er forbun- . det med den nederste åbne ende 34 af standrøret 33. Det ved ekspansionen i den anden strålepumpe 2 indtrædende trykfald tjener til transport af råvandet RW, der blandes med meget 15 fine gasblærer, som senere udskilles igen i flotationsbeholderen 3. De gennem standrøret 33 indtrædende, med luftblærer sammenblandede uopløste bestanddele af råvandet fjernes som tidligere nævnt gennem det øverste udløb 36, og det rensede vand PW afstrømmer gennem udløbet 35 fra flotationsbeholde-20 ren 3. Under driften indstilles strømmængderne sådan, at der i flotationsbeholderen 3 indstiller sig en stationær grænse for luftblærerne.From the outlet 35, the purified liquid flows through a conduit 37, and through a branch conduit 38 thereto, a portion of the purified water flows through a throttle location 39 to the fuel inlet 11 of the first jet pump 1. The suction side of the jet pump 1 is through a suction connection 13 in connection to the gas required for the flotation, preferably purified 5 air L. This air is dissolved in the liquid by the pressure built up by the jet pump 1. The flow through the first jet pump 1 is maintained by the circulation pump 4, and the outlet 12 from the first jet pump 1 communicates with the propellant inlet 21 to the second jet pump 2, whose suction side 10 receives through the suction connection 23 the raw water RW to be purified. The outlet 22 from this second jet pump 2 is connected. that with the lower open end 34 of the standpipe 33. The pressure drop occurring at the expansion of the second jet pump 2 serves to transport the raw water RW, which is mixed with a lot of 15 fine gas bubbles, which are later excreted again in the flotation vessel 3. Those entering through the standpipe 33, As previously mentioned, with undisturbed water-mixed components of the raw water, the upper outlet 36 is removed and the purified water PW flows through the outlet 35 from the flotation tank 3. During operation, the flow rates are adjusted so that in the flotation tank 3 a stationary limit is set for luftblærerne.

Apparatet ifølge opfindelsen kan anvendes til mange opgaver indenfor vandrensningsteknikken, hvor det gælder om at af-25 skille urenheder, såsom olie og fedtstoffer. Endvidere er apparatet ifølge opfindelsen velegnet til beluftning af klaringsanlæg og af fiskedamme, idet vandmængderne indstilles således, at en vis del af den opløste luft træder ud i form af luftblærer, hvorved en del faste stoffer.fraskil-30 les. Apparatet ifølge opfindelsen kan også anvendes som gasvasker i stedet for en modstrøms-absorptionskolonne, hvilket medfører en betydelig pladsbesparelse.The apparatus according to the invention can be used for many tasks in the water purification technique where it is necessary to separate impurities such as oil and fats. Furthermore, the apparatus according to the invention is suitable for aeration of clearing systems and of fish ponds, the quantities of water being adjusted so that a certain part of the dissolved air exits in the form of air bubbles, whereby some solids are separated. The apparatus of the invention can also be used as a gas washer instead of a countercurrent absorption column, which results in considerable space savings.