DK156557B - METHOD FOR TREATING SLAM FROM SEPTIC TANKS - Google Patents

METHOD FOR TREATING SLAM FROM SEPTIC TANKS Download PDF

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Publication number
DK156557B
DK156557B DK490579AA DK490579A DK156557B DK 156557 B DK156557 B DK 156557B DK 490579A A DK490579A A DK 490579AA DK 490579 A DK490579 A DK 490579A DK 156557 B DK156557 B DK 156557B
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sludge
septic tanks
biological
treatment
oxygen
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DK490579AA
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Danish (da)
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DK490579A (en
DK156557C (en
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Thierry Laederich
Paolo Formaggio
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Air Liquide
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/1221—Particular type of activated sludge processes comprising treatment of the recirculated sludge
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/26—Activated sludge processes using pure oxygen or oxygen-rich gas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Activated Sludge Processes (AREA)

Abstract

1. Method for the biological processing by activated sludge of night soil or septic tank sludge, having the following characteristics : dry material : 6-40 Kg/m**3 volatile material : 65-80% of dry material DBO(5) : at least 5-15 Kg/m**3 DCO (bichromate) : 10-45 Kg/m**3 of the type where the said septic tank sludge or night soil undergoes a biological activation process with a gas having a high oxygen content of at least 5% in volume for a duration of at least 5 hours, characterised in that at the start of the process the septic tank sludges to be processed are seeded with an activated sludge, emanating from a station for waste water biological processing by the activated mud process, said mud having a dry material content of 6 to 15 Kg per m**3 , the rate of seeding being at least 0.6 Kg of dry material per m**3 of sludge to be processed, and in that the said seeded septic tank sludges are submitted to the said biological oxidation process with a mixing energy and an output of the said high oxygen content gas such that the content of oxygen dissolved in the said septic tank sludges is at least 109/m**3 and in that furthermore the processed septic tank sludges are continuously decanted, producing on the one hand a decanted biological sludge having a Mohlman index comprised between 30 and 60 and a clear filtrate having a DBO of 0.3 to 2.5 Kg/m**3 and a DCO of 0.5 to 4 Kg/m**3 , the quantity of oxygen being introduced being less than 0.5 Kg per Kg of dry material introduced.

Description

DK 156557 BDK 156557 B

Opfindelsen omhandler en fremgangsmâde til biologisk be-handling af slam ved periodisk t0mning af septiktanke med et indhold af t0rstof, flygtigt stof, og biologisk og kemisk oxygen forbrugende stoffer med de i krav l's 5 indledning angivne store indholdsmængder.The invention relates to a method for the biological treatment of sludge by periodically emptying septic tanks with a content of solids, volatiles, and biological and chemical oxygen consuming substances with the large amounts of content as set out in claim 5.

Det er foreslâet at indf0re slammet fra septiktanke i den afsluttende behandlingskæde for dekanteret slam fra en spildevandsrensningsstation. Herved frig0res der 10 imidlertid. ubehagelig lugt, og pressefilteret mâ under-kastes kostbare rensningsbehandlinger for at opretholde filtreringsevnen.It is proposed to introduce the sludge from septic tanks into the decanted sludge treatment chain from a wastewater treatment plant. This, however, releases 10. unpleasant odors, and the press filter must be subjected to costly purification treatments to maintain filtration ability.

Pra fransk patentskrift nr. 2 340 277 er det kendt at 15 stabilisere slam fra septiktanke ved hjælp af en oxygen-rig gasart til formindskelse af slammets indhold af or-ganiske stoffer til et niveau, der kan undertrykkes i efterf0lgende behandlingsanlæg. Slammet underkastes en forholdsvis langvarig behandling i en f0rste fase med et 20 indhold af opl0st oxygen pâ 0 mg/1 stigende til 1-2 mg/1 og en f0lgende fase pâ 1-5 mg/1.In French Patent Specification No. 2,340,277, it is known to stabilize sludge from septic tanks using an oxygen-rich gas species to reduce the sludge's content of organic substances to a level that can be suppressed in subsequent treatment plants. The sludge is subjected to a relatively long-term treatment in a first phase with a dissolved oxygen content of 0 mg / 1 increasing to 1-2 mg / 1 and a subsequent phase of 1-5 mg / 1.

Opfindelsen har til formâl at t-ilvejebringe· en f remgangsmâde af den angivne art, hvorved slam fra septik-25 tanke ikke blot kan g0res dekanterbart eller filtrer- bart, men ogsâ lugtfrit, sâ at ikke blot dekanteret slam fra septiktanken kan indf0res i behandlingskæden for dekanteret slam i et biologisk spildevandsrensningsanlæg, men ogsâ filtratet eller det ovenpâ sv0mmende stof kan 30 indf0res i behandlingskarret for det selvsamme anlæg.The invention has for its object to provide a method of the specified kind whereby sludge from septic tanks can not only be made decantable or filterable, but also odorless, so that not only decanted sludge from the septic tank can be introduced into the treatment chain for decanted sludge in a biological wastewater treatment plant, but also the filtrate or the buoyant substance may be introduced into the treatment plant for the same plant.

Dette opnâs if0lge opfindelsen ved en fremgangsmâde af den i krav l's kendetegnende del angivne art.This is achieved according to the invention by a method of the characterizing part of claim 1.

35 Opfindelsen forklares nærmere nedenfor i forbindelse med tegningen, hvor: 2The invention is explained in more detail below in connection with the drawing, in which: 2

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fig. 1 viser et anlæg til behandling af slam fra septik-tanke ved fremgangsmâden if0lge opfindelsen, fig. 2 viser et anlæg til behandling af slam fra septik-5 tanke i forbindelse med en station til fysisk-kemisk behandling af spildevand, fig. 3 viser et anlæg til behandling af slam fra septiktanke i forbindelse med et anlæg til biologisk behand-10 ling af slam ved varmekonditionering,. og fig. 4 viser et anlæg til behandling af slam fra septiktanke i forbindelse med en iltningsapparat.FIG. Fig. 1 shows a plant for treating sludge from septic tanks in the method according to the invention; Figure 2 shows a plant for treating sludge from septic-5 tanks in connection with a physico-chemical treatment of sewage; 3 shows a plant for treating sludge from septic tanks in connection with a plant for biological treatment of sludge by heat conditioning. and FIG. 4 shows a plant for treating sludge from septic tanks in connection with an oxygenation apparatus.

\ 15 Fig. 1 viser en reaktor 1 til behandling af slam fra septiktanke, som er aflukket af et dæksel 2, og som gen-nem en ledning 3 med en pumpe 4 modtager en str0m af slam fra septiktanke, der er aflejret i en lagerbeholder 5. I det indre af reaktoren 1 er der tilvejebragt et 20 diffusionsorgan 10, som over en ledning 11 er forbundet med en reguleringsventil 12 og et dosimeter 13 ved udl0-bet af en oxygenfordamper 14, hvis indl0b er forbundet med en lagerbeholder 15 for flydende oxygen.FIG. 1 shows a reactor 1 for treating sludge from septic tanks, which is sealed by a cover 2, and which through a conduit 3 with a pump 4 receives a stream of sludge from septic tanks deposited in a storage vessel 5. In it inside the reactor 1 is provided a diffusion means 10 which is connected over a line 11 to a control valve 12 and a dosimeter 13 at the outlet of an oxygen evaporator 14, the inlet of which is connected to a liquid oxygen storage container 15.

25 Opl0sningen af oxygenet i slammet fra septiktankene til-vejebringes og udjævnes ved hjælp af et r0reorgan 20 med en motor 21. Dimensionen af reaktoren 1 og gennemstr0m-ningsmængden af pumpen 4 er sâledes, at slammet fra septiktankene forbliver mindst 5 timer og fortrinsvis fra 30 12 til 24 timer i reaktoren 1. I nærværende eksempel er den indspr0jtede gas rent oxygen, og omr0ringsenergien af r0reorganet 20 og den af reguleringsventilen 12 regu-lerede gennemstr0mningsmængde af oxygen er sâledes, at indholdet af opl0st oxygen i slammet under behandling er 35 mindst 10 g/m3 og fortrinsvis.imellem 15 og 25 g/m3. For at kunne frig0re de gasformige reaktionsprodukter sâsom 3The dissolution of the oxygen in the sludge from the septic tanks is provided and leveled by means of a stirrer 20 with a motor 21. The dimension of the reactor 1 and the flow rate of the pump 4 are such that the sludge from the septic tanks remains at least 5 hours and preferably 30 12 to 24 hours in the reactor 1. In the present example, the injected gas is pure oxygen and the stirring energy of the stirrer 20 and the flow rate of oxygen regulated by the control valve 12 is such that the dissolved oxygen content of the sludge during treatment is at least 10 and preferably between 15 and 25 g / m 3. In order to release the gaseous reaction products such as 3

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kuldioxid og nitrogen er der gennem dækslet 2 f0rt en ledning 23 med en ventil 24 til omgivelserne. Derefter sendes det behandlede slara fra septiktankene gennem en ledning 30 til et dekanteringsorgan 31, hvorfra der fri-5 g0res et ovenpâ sv0mmende filtrat 32 og et dekanteret slam 33. Piltratet 32 har et COD og et BOD beliggende imellem henholdsvis 1000-2000 g/m3 og 300-700 g/m3 og sendes igennem en ledning 34 direkte til et behandlings-bassin 35 i et anlæg til biologisk behandling af spilde-10 vand, der indl0ber ved 36 igennem et priraært dekanteringsorgan 37, mens det behandlede vand sendes igennem en ledning 38 til et afsluttende dekanteringsorgan 39, fra hvilket der separeres klart vand 40, der sendes til-bage til eksempelvis floden igennem en ledning 41, og 15 aktiveret slam 42, af hvilket et parti recirkuleres ved hjælp af en pumpe 43 og en ledning 44 til behandlings-bassinet 35, mens et overskudsparti fjernes igennem en ledning 45 til et slambehandlingsanlæg med et stabili-seringsbassin 46 og et apparat 47 til mekanisk vandaf-20 spaltning af slammet, hvilket slam derefter enten bræn-des ved 48 eller udlades ved 49.carbon dioxide and nitrogen, through the cover 2, a conduit 23 is provided with a valve 24 for the surroundings. Thereafter, the treated slurry is sent from the septic tanks through a conduit 30 to a decanting means 31, from which a floating bath filtrate 32 and a decanted sludge 33 are released. Piltrate 32 has a COD and a BOD located between 1000-2000 g / m 3 respectively. and 300-700 g / m3 and passed through a conduit 34 directly to a treatment basin 35 in a biological treatment plant for wastewater 10 which enters at 36 through a primary decanting means 37 while the treated water is sent through a conduit 38 to a final decanting means 39, from which clear water 40 is sent back to, for example, the river through a conduit 41, and 15 activated sludge 42, a portion of which is recycled by means of a pump 43 and conduit 44 to the treatment basin 35, while an excess portion is removed through a conduit 45 to a sludge treatment plant with a stabilization basin 46 and an apparatus 47 for mechanical water decomposition of the sludge, which sludge then enters. n is burned at 48 or discharged at 49.

.. Et parti af det aktiverede slam, der sendes igennem pum-pen 43, sendes i det mindste ved starten af behandlingen 25 af slammet fra septiktankene igennem en ledning 50 med en doseringspumpe 51 tilbage til behandlingsreaktoren 1 for at tilvejebringe en forgæring af slammet fra septiktankene. Denne indspr0jtning af aktiveret slam i reakto-ren 1 tilvejebringes fortrinsvis kontinuert med en slam-30 mængde pâ mindst 600 g t0rstof pr. m3 af det slam fra septiktankene, der leveres til reaktoren 1 af pumpen 4.At least at the start of processing 25 of the sludge from the septic tanks through a conduit 50 with a metering pump 51, a portion of the activated sludge sent through the pump 43 is returned to the treatment reactor 1 to provide a slurry of the sludge from septic tanks. This injection of activated sludge into reactor 1 is preferably provided continuously with a sludge amount of at least 600 grams of dry matter per minute. m3 of the sludge from the septic tanks supplied to the reactor 1 of the pump 4.

Fig. 2 viser et anlæg til behandling af slam fra septik-tanke i forbindelse med en station til fysisk-kemisk be-35 handling af spildevand. Reaktoren 60 til behandling af slammet fra septiktankene leverer her igennem en ledning 4FIG. Figure 2 shows a plant for treating sludge from septic tanks in connection with a physico-chemical treatment of sewage. Here, the reactor 60 for treating the sludge from the septic tanks supplies through a conduit 4

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61 det behandlede slam, af hvilket et parti igennem en ledning 62 str0mmer til et dekanteringsorgan 63 og et andet parti igennem en ledning 64 f0res til et sættebas-sin 65, som igennem en ledning 66 ogsâ modtager det de-5 kanterede slam fra dekanteringsorganet 63. Det ovenpâ sv0mmende filtrat fra dekanteringsorganet 63 og filtra-tet fra sættebassinet 65 f0res igennem ledningerne 67 og 68 og l0ber sammen igennem en ledning 69 til et sammen-klumpningsapparat 70 for spildevand, der f0rst og frem-10 mest modtager spildevand igennem en ledning 71. Sammen-klumpningsapparatet 70 af konventionel type er forsynet med et r0reorgan 72 og en ledning 73 til indf0ring af et fnugdannende stof, eksempelvis aluminiumsulfat. Det sâ-ledes behandlede vand sendes igennem en ledning 74 til 15 et klarebad 75, fra hvilket filtratet udg0r det rensede vand, som igennem en ledning 67 sendes tilbage til eksempelvis floden, mens det dekanterede slam igennem en ledning 77 sendes tilbage til sættebassinet 65.61 the treated sludge, of which a portion through a conduit 62 flows to a decanting means 63 and another portion through a conduit 64 is fed to a set base 65 which, through a conduit 66, also receives the decanted sludge from the decanting means 63 The supernatant filtrate from the decanting means 63 and the filtrate from the set basin 65 are passed through conduits 67 and 68 and run through a conduit 69 to a waste water clog apparatus 70 which first and foremost receives wastewater through a conduit 71. Conventional-type lumping apparatus 70 is provided with a stirrer 72 and a conduit 73 for introducing a lint-forming substance, for example, aluminum sulfate. The treated water is then passed through a conduit 74 to 15 a clearing bath 75, from which the filtrate is made up of the purified water, which is sent back through the conduit 67 to, for example, the river, while the decanted sludge through a conduit 77 is sent back to the set basin 65.

20 Produkterne fra sættebassinet 65 f0res derefter igennem et organ 68 til mekanisk vandafspaltning og derefter som tidligere til en brændeovn 79 og/eller et udl0b 79' for det aktiverede slam eller asken fra brændeovnen 79.The products from the set basin 65 are then passed through a means 68 for mechanical water decomposition and then, as before, to a stove 79 and / or an outlet 79 'for the activated sludge or ash from the stove 79.

25 Fig. 3 viser et anlæg til behandling af slam fra septik-tanke i forbindelse med et anlæg til biologisk behandling af slam ved varmekonditionering. Her indl0ber slam-met fra septiktankene igennem en ledning 80 til et dekanteringsorgan 81, fra hvilket det dekanterede slam 30 sendes igennem en ledning 82 til et sættebassin 83, som ogsâ igennem en ledning 84 modtager slam fra et bassin til biologisk behandling af spildevandet. En del af slammet fra septiktankene kan dog ogsâ f0res direkte igennem en ledning 85 til sættebassinet 83. Det ovenpâ 35 sv0mmende filtrat i sættebassinet 83 sendes igennem en ledning 86 tilbage til hovedbassinet for biologisk rens- 5FIG. 3 shows a plant for the treatment of sludge from septic tanks in connection with a plant for biological treatment of sludge by heat conditioning. Here, the sludge from the septic tanks passes through a conduit 80 to a decanting means 81, from which the decanted sludge 30 is sent through a conduit 82 to a set basin 83 which also receives through a conduit 84 a sludge from a basin for biological treatment of the wastewater. However, a portion of the sludge from the septic tanks can also be passed directly through a conduit 85 to the set basin 83. The upstream 35 filtrate in the basin 83 is sent through a conduit 86 back to the main basin for biological purification.

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ning. Det ved bunden af sættebassinet 83 udtrukne slam overf0res igennem en ledning 87 til et varmekonditione-ringstârn 88, der arbejder ved eksempelvis 180 °C i nog-le timer, hvorefter slammet overf0res igennem en ledning 5 89 til et dekanteringsorgan 90 for det konditionerede slam. Slammet fra dekanteringsorganet 90 behandles pâ sædvanlig mâde i et vandafspaltningsapparat 91 og bliver derefter enten brændt ved 92 og udladet ved 93 eller ud-ladet direkte ved 94. Piltratet fra vandafspaltningsap-10 paratet 91 overf0res -igennem en ledning 95 til en ledning 96, der opsamler filtratet fra dekanteringsorganet 90, og sendes tilbage til sættebassinet 83.equipment. The sludge drawn at the bottom of the basin 83 is transferred through a conduit 87 to a heat conditioning tower 88 operating at, for example, 180 ° C for a few hours, after which the sludge is transferred through a conduit 59 to the decanted sludge 90 means. The sludge from the decanting means 90 is treated in the usual manner in a water-splitting apparatus 91 and is then either burned at 92 and discharged at 93 or discharged directly at 94. The filtrate from the water-splitting apparatus 91 is passed through a conduit 95 to a conduit 96 which collects the filtrate from the decanter 90 and is returned to the set basin 83.

Fig. 4 viser et anlæg til behandling af slam fra septik-15 tanke med en hovedreaktor 100, i hvilket slammet fra septiktankene indl0ber igennem en ledning 101 med en pumpe 102, og som gennem en ledning 103 med en pumpe 104 modtager det aktiverede recirkulerede slam, der tjener til forgæringen. Reaktoren 100 er her ogsâ forsynet med 20 et dæksel 105 med en ledning 106 med en ventil 107 til omgivelserne. Det særegne ved denne reaktor er, at ilt-ningen af det aktiverede slam sker i et særskilt ilt-ningsapparat 108, i hvilket slammet indf0res i lodret retning igennem en ledning 109 med en pumpe 110 til re-25 cirkulering til reaktoren 100 igennem en ledning 111, og iltningsapparatet 108 er forsynet med en tilgangsledning 112 med en gennemstr0mningsreguleringsventil 113, for-bundet med en oxygenkilde.FIG. 4 shows a plant for treating sludge from septic tanks with a main reactor 100, in which the sludge from the septic tanks enters through a conduit 101 with a pump 102 and which receives through the conduit 103 with a pump 104 the activated recycled sludge which serves for the fermentation. Here, the reactor 100 is also provided with a cover 105 with a conduit 106 with a valve 107 for the surroundings. The peculiarity of this reactor is that the oxygenation of the activated sludge takes place in a separate oxygenation apparatus 108 in which the sludge is introduced vertically through a line 109 with a pump 110 for recirculation to the reactor 100 through a line. 111, and the oxygenation apparatus 108 is provided with an inlet line 112 with a flow control valve 113 connected to an oxygen source.

30 Iltningsapparatet 108 kan være udformet pâ forskellig mâde til overf0rïng af oxygen, eksempelvis med en for-snævringsdyse, en kuglekolonne, en ejektor osv.The oxygenation apparatus 108 may be configured in various ways for the transfer of oxygen, for example, with a narrowing nozzle, a ball column, an ejector, etc.

Det behandlede slam sendes som tidligere igennem en led-35 ning 114 til forskellige efterf0lgende behandlingssta-tioner.The treated sludge, as before, is sent through line 114 to various subsequent treatment stations.

I nedenstâende tabel gengives nogle resultater:The following table gives some results:

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sp

Rumfang af det biologiske bassin: 13 m3Volume of the biological basin: 13 m3

Eksempler Nr. 1 Nr. 2 Nr. 3Examples No. 1 No. 2 No. 3

Gennemstr0mning m^/d 18 21,5 18 5 BOD indl0b kg/m3 7,446 11,250 13,700 BOD udl0b " 0,600 2,080 2,200 BOD fjernet % 91,9 81,5 83,9 COD indl0b kg/m3 24,608 29,913 29,213 COD udl0b " 1,760 3,148 3,951 COD fjernet % 92,8 89,5 86,5 10 T0rstof indl0b udtrukket 100 °C kg/m3 14,95 28,77 15,70 T0rstof, aktiveret slam 100 °C kg/m3 14,90 16,0 16,70Flow m ^ / d 18 21.5 18 5 BOD inlet kg / m3 7,446 11,250 13,700 BOD outlet "0.600 2,080 2,200 BOD removed% 91.9 81.5 83.9 COD inlet kg / m3 24,608 29,913 29,213 COD outlet" 1,760 3,148 3,951 COD removed% 92.8 89.5 86.5 10 Dry inlet extracted 100 ° C kg / m3 14.95 28.77 15.70 Dry matter, activated sludge 100 ° C kg / m3 14.90 16.0 16, 70

Flygtigt stof, aktiveret slam % 73,3 76,0 77,2 15 Ladningsvægt BOD5 MV/kq.d *) 0,867 1,267 1,326Volatile matter, activated sludge% 73.3 76.0 77.2 15 Charge weight BOD5 MV / kq.d *) 0.867 1.267 1.326

Ladningsrumfang BODs/m3 9,5 12,7 15,9 T0rstof, dekanteret slam kg/m3.d 43,8 63,7 54,6Cargo volume BODs / m3 9.5 12.7 15.9 Solids, decanted sludge kg / m3d 43.8 63.7 54.6

Mohlmann-indeks nil/g 39 40 41Mohlmann index nil / g 39 40 41

Oxygen-forbrug m3/d 30,7 62,3 44,9Oxygen consumption m3 / d 30.7 62.3 44.9

Gennemblæst oxygen m3/d 7,34 11,7 13,15 20 Oxygen-virkningsgrad % 76,09 75,00 70,70Blown oxygen m3 / d 7.34 11.7 13.15 Oxygen efficiency% 76.09 75.00 70.70

Opholdstid/slamtid h 17,3 14,5 17,3Residence / slime time h 17.3 14.5 17.3

Oxygen-forbrug kg/02 per kg fjernet BOD 0,355 0,316 0,216 kg fjernet COD 0,0746 0,108 0,0953 25 kg behandlet t0rstof 0,114 0,100 0,159 m3 behandlet slam 1,70 2,99 2,49 *) MV = flygtigt stof 30 35Oxygen consumption kg / 02 per kg removed BOD 0.355 0.316 0.216 kg removed COD 0.0746 0.108 0.0953 25 kg treated dry matter 0.114 0.100 0.159 m3 treated sludge 1.70 2.99 2.49 *) MV = volatile matter 30 35

Claims (4)

1. Fremgangsmâde til biologisk behandling ved aktiveret slam af ekskrementer eller slam fra septiktanke med f0l-5 gende sammensætning: t0rstof : 6-40 kg/m3 flygtigt stof : 65 - 80 % 10 BOD5 : mindst 5-15 kg/m3 COD (bichromat) : 10-45 kg/m3 15 hvor slammet fra septiktankene eller ekskrementerne un-derkastes en behandling til biologisk aktivering med en gas med et stort indhold af oxygen pâ mindst 50 volumen-% i et tidsrum pâ mindst 5 timer, kendetegnet ved, at man ved begyndelsen af be-20 handlingen forgærer slammet fra septiktankene, der skal behandles, med aktiveret slam, der stammer fra en station til biologisk behandling af spildevand ved den nævnte biologiske aktiveringsbehandling, med et indhold af t0rstof pâ 6 - 15 kg/m3, og hvor forgæringsmængden er 25 mindst 0,6 kg t0rstof per m3 af det slam, der skal behandles, og at det forgærede slam fra septiktankene un-derkastes den nævnte behandling til biologisk oxidering med et sâ stort energiforbrug til omr0ring og en sâ stor gennemstr0mningsmængde af den nævnte gas med et stort 30 indhold af oxygen, at indholdet af opl0st oxygen i slammet fra septiktankene er mindst 10 g/m3, og at der fore tages en kontinuert dekantering af det behandlede slam fra septiktankene, der frembringer dels et dekanteret biologisk slam med et Mohlmann-indeks imellem 30 og 60 35 og et klart filtrat med et BOD pâ 0,5 - 2,5 kg/m3 og et DK 156557 B COD pâ 0,5 - 4 kg/m3, hvorhos mængden af indf0rt oxygen er mindre end 0,5 kg per kg af indf0rt t0rstof.1. Process for biological treatment by activated sludge of excrement or sludge from septic tanks of the following composition: solids: 6-40 kg / m3 volatile matter: 65 - 80% 10 BOD5: at least 5-15 kg / m3 COD (bichromate ): 10-45 kg / m3 15 where the sludge from the septic tanks or excrements is subjected to a biological activation treatment with a gas having a high oxygen content of at least 50% by volume for a period of at least 5 hours, characterized in that at the beginning of the treatment, the sludge from the septic tanks to be treated is fermented with activated sludge originating from a wastewater biological treatment station of said biological activation treatment having a content of 6-15 kg / m3 dry matter, and wherein the fermentation amount is at least 0.6 kg of dry matter per m3 of the sludge to be treated, and that the fermented sludge from the septic tanks is subjected to said biological oxidation treatment with such a high energy consumption for stirring and a high gas consumption. flow rate of said gas having a high oxygen content, that the dissolved oxygen content in the sludge from the septic tanks is at least 10 g / m 3, and that a continuous decantation of the treated sludge from the septic tanks is produced, producing partly a decanted biological sludge with a Mohlmann index between 30 and 60 35 and a clear filtrate with a BOD of 0.5 - 2.5 kg / m3 and a DK 156557 B COD of 0.5 - 4 kg / m3, wherein the amount of oxygen introduced is less than 0.5 kg per kg of imported solids. 2. Fremgangsmâde til behandling af slam fra septiktanke 5 if0lge krav 1, kendetegnet ved, at energifor- bruget til omr0ring og gennemstr0mningsmængden af gassen med et stort indhold af oxygen er sâledes, at indholdet af det oxygen, der opl0ses i slammet fra septiktankene under behandling, ligger imellem 15 og 25 g/m3. 10Method for treating sludge from septic tanks 5 according to claim 1, characterized in that the energy consumption for stirring and the flow rate of the gas with a large content of oxygen is such that the content of the oxygen dissolved in the sludge from the septic tanks during treatment , lies between 15 and 25 g / m3. 10 3. Fremgangsmâde til behandling af slam fra septiktanke if0lge krav 1, kendetegnet ved, at varigheden af behandlingen af slammet er under 24 timer.Method for treating sludge from septic tanks according to claim 1, characterized in that the duration of treatment of the sludge is less than 24 hours. 4. Fremgangsmâde til behandling af slam fra septiktanke if0lge krav 1-3, kendetegnet ved, at slammet behandles i en reaktor med iltning ved cirkulation af slammet i et særskilt iltningsapparat af typen med en forsnævringsdyse-ejektor eller en boblekolonne. 20 25 30 35Method for treating sludge from septic tanks according to claims 1-3, characterized in that the sludge is treated in an oxygen reactor by circulating the sludge in a separate oxygenation device of the type with a narrowing nozzle ejector or bubble column. 20 25 30 35
DK490579A 1978-11-20 1979-11-19 METHOD FOR TREATING SLAM FROM SEPTIC TANKS DK156557C (en)

Applications Claiming Priority (2)

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FR7832640A FR2441586A1 (en) 1978-11-20 1978-11-20 METHOD AND PLANT FOR THE TREATMENT OF SEPTIC PIT SLUDGE
FR7832640 1978-11-20

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DK490579A DK490579A (en) 1980-05-21
DK156557B true DK156557B (en) 1989-09-11
DK156557C DK156557C (en) 1990-02-12

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DE (1) DE2960901D1 (en)
DK (1) DK156557C (en)
ES (1) ES486099A1 (en)
FR (1) FR2441586A1 (en)
GR (1) GR66516B (en)
PT (1) PT70464A (en)
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JPS56139196A (en) * 1980-04-01 1981-10-30 Ebara Infilco Co Ltd Treatment of sludge in decontamination vessel
FR2506287A1 (en) * 1981-05-25 1982-11-26 Air Liquide PROCESS AND PLANT FOR TREATING SLUDGE FROM WASTEWATER TREATMENT
JPH02284699A (en) * 1989-04-25 1990-11-22 Ebara Infilco Co Ltd Treatment of septic tank sludge
JP4873341B2 (en) * 2005-04-22 2012-02-08 有限会社森内鉄工所 Ship rudder device
CN102730922A (en) * 2012-06-28 2012-10-17 杭州师范大学 Preservation device of anaerobic ammonium oxidation granular sludge

Citations (7)

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US2615842A (en) * 1946-10-24 1952-10-28 Leon S Kraus Method of and apparatus for concentrating sewage sludges
DE2105420A1 (en) * 1971-02-05 1972-08-17 Aerobic Digesters Inc Sewage treatment plant - using oxygen bubbling in pressurized container
DE2216917A1 (en) * 1972-04-07 1973-10-18 Richard Dipl Ing Schreiber METHOD AND DEVICE FOR INTRODUCING A GAS INTO A LIQUID, IN PARTICULAR OXYGEN INTO WATER
FR2205484A1 (en) * 1972-11-03 1974-05-31 Matthey Doret Daniel Biological purificn station for polluted water - using single bacterial strain for both anaerobic and aerobic phases
FR2340277A1 (en) * 1976-02-03 1977-09-02 Messer Griesheim Gmbh Aerobic treatment of sewage sludge with oxygen - injected into sludge which is rotated without mechanical agitator
US4094774A (en) * 1974-06-06 1978-06-13 Smith Eugene J Method and apparatus for oxygenating aerobically decomposable liquors
CH602498A5 (en) * 1976-10-25 1978-07-31 Norm Amc Ag Effluent clarifier wet sludge treatment

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FR1528179A (en) * 1966-05-24 1968-06-07 Norstel And Templewood Hawksle Treatment process for sewage and other organic sludge

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615842A (en) * 1946-10-24 1952-10-28 Leon S Kraus Method of and apparatus for concentrating sewage sludges
DE2105420A1 (en) * 1971-02-05 1972-08-17 Aerobic Digesters Inc Sewage treatment plant - using oxygen bubbling in pressurized container
DE2216917A1 (en) * 1972-04-07 1973-10-18 Richard Dipl Ing Schreiber METHOD AND DEVICE FOR INTRODUCING A GAS INTO A LIQUID, IN PARTICULAR OXYGEN INTO WATER
FR2205484A1 (en) * 1972-11-03 1974-05-31 Matthey Doret Daniel Biological purificn station for polluted water - using single bacterial strain for both anaerobic and aerobic phases
US4094774A (en) * 1974-06-06 1978-06-13 Smith Eugene J Method and apparatus for oxygenating aerobically decomposable liquors
FR2340277A1 (en) * 1976-02-03 1977-09-02 Messer Griesheim Gmbh Aerobic treatment of sewage sludge with oxygen - injected into sludge which is rotated without mechanical agitator
CH602498A5 (en) * 1976-10-25 1978-07-31 Norm Amc Ag Effluent clarifier wet sludge treatment

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EP0011573B1 (en) 1981-09-23
AU533079B2 (en) 1983-10-27
DE2960901D1 (en) 1981-12-10
DK490579A (en) 1980-05-21
AU5279579A (en) 1980-05-29
ES486099A1 (en) 1980-05-16
GR66516B (en) 1981-03-24
DK156557C (en) 1990-02-12
PT70464A (en) 1979-12-01
ATE241T1 (en) 1981-10-15
JPS5570398A (en) 1980-05-27
FR2441586A1 (en) 1980-06-13
ZA796069B (en) 1980-10-29
EP0011573A1 (en) 1980-05-28

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