SE450893B - PROCEDURE FOR INJECTION OF BIOLOGICAL SLAY - Google Patents
PROCEDURE FOR INJECTION OF BIOLOGICAL SLAYInfo
- Publication number
- SE450893B SE450893B SE8202201A SE8202201A SE450893B SE 450893 B SE450893 B SE 450893B SE 8202201 A SE8202201 A SE 8202201A SE 8202201 A SE8202201 A SE 8202201A SE 450893 B SE450893 B SE 450893B
- Authority
- SE
- Sweden
- Prior art keywords
- sludge
- biological
- procedure
- thickening
- nitrate
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 21
- 238000002347 injection Methods 0.000 title 1
- 239000007924 injection Substances 0.000 title 1
- 239000010802 sludge Substances 0.000 claims description 46
- 230000008569 process Effects 0.000 claims description 14
- 230000008719 thickening Effects 0.000 claims description 9
- 230000002255 enzymatic effect Effects 0.000 claims description 7
- 238000005119 centrifugation Methods 0.000 claims description 5
- 150000002823 nitrates Chemical class 0.000 claims description 4
- 244000144992 flock Species 0.000 claims description 3
- 150000002826 nitrites Chemical class 0.000 claims description 3
- 239000000725 suspension Substances 0.000 description 9
- 229910002651 NO3 Inorganic materials 0.000 description 7
- 244000005700 microbiome Species 0.000 description 7
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 6
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005188 flotation Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- 239000002775 capsule Substances 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 150000001720 carbohydrates Chemical class 0.000 description 2
- 235000014633 carbohydrates Nutrition 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000867 polyelectrolyte Polymers 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000003097 mucus Anatomy 0.000 description 1
- -1 nitrate ions Chemical class 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000002797 proteolythic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000008925 spontaneous activity Effects 0.000 description 1
Classifications
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/342—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the enzymes used
-
- 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
- C02F3/28—Anaerobic digestion processes
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (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)
- Enzymes And Modification Thereof (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
450 893 _ 2 _" Eftersom slambiomassan emellertid innehåller upp till 40% protein,.strävar man efter att utnyttja en del slamsorter som foder. För detta ändamål måste emellertid biomassan torkas, och före torkningen måste slammet så vitt möjligt avvattnas. Avvattning och intjockning av aktivt slam är emellertid en svår uppgift, vilket är_välbekant bland fack- män. Detta förhâ1lande.teror pâ, att det aktiva slammet 'har en olämplig fysikalisk struktur och binder en stor mängd svåravskilt vatten, varigenom det är mycket voluminöst.- Slam som avskilts genom sedimentation uppvisar en torr- substanshalt på endast upp till 1%. För intjockning an- vändes I s.k. tryckflotation, som går så till, att fin- fördelad tryckluft drives in i slamsuspensionen, varvid de små blåsorna bär upp slamflockarna ti1l.vattenytanl Slam som flpterats på detta sätt uppvisar en torrsubstans- halt av max. 5%, då intjockningen endast förorsakas av god avskiljning av slamsuspensionens vätskefas, och den fysika- liska strukturen förblir oförändrad;' En biomassa, som av- skilts på detta sätt och förtjockats vidare i en dekanter-. centrifug, uppnår med hänsyn till sin oförändrade struktur upp.till 1o% torrsuöstans. 450 893 _ 2 _ "However, since the sludge biomass contains up to 40% protein, it is sought to use some sludges as feed. For this purpose, however, the biomass must be dried, and before drying the sludge must be dewatered as far as possible. Dewatering and thickening of However, activated sludge is a difficult task, which is well known to those skilled in the art. This is due to the fact that the activated sludge has an unsuitable physical structure and binds a large amount of difficult-to-separate water, making it very voluminous. sedimentation has a dry matter content of only up to 1% For thickening, so-called pressure flotation is used, which means that finely divided compressed air is forced into the sludge suspension, the small blisters carrying the sludge flocks to the surface of the sludge. in this way exhibits a dry matter content of max. 5%, as the thickening is only caused by good separation of the liquid phase of the sludge suspension, and the physical s the structure remains unchanged; ' A biomass, separated in this way and further thickened in a decanter centrifuge, achieves, with regard to its unchanged structure, up to 10% dry matter.
För att öka effekten av en centrifugering förbättras den fysikaliska strukturen hos det slam, som skall bearbetas, exempelvis genom tillsats av aluminium- eller järnsalter, polyelektrolyter och liknande. lDessa ämnen förorsakar en ändring av slammicellernas och 'hydratationshöljets elektriska laddning, så att mer av det vatten, som är bundet'genom' adhesiva krafter på slampartikelns stora yta, frigörs. En på detta sätt uppnådd strukturförändring ger vid centrifu- gering en god intjockning, som ligger nära den som kan upp- nås genom centrifugering av encelliga mikroorganismer, exem- pelvis jäst. Men även detta förfarande drar stora kostna- der, särskilt för polyelektrolyter, vilkas pris hela tiden stiger. ' ' 450 ses ._3_ I Dessa nackdelar undanröjes av förfarandet enligt uppfinnin- Vgen, enligt vilket strukturförändringen åstadkommes billigt, under utnyttjande av enzymatisk verksamhet av mikroorganis- mer, närvarande i biologiska slam, särskilt i aktivt slam.To increase the effect of a centrifugation, the physical structure of the sludge to be processed is improved, for example by the addition of aluminum or iron salts, polyelectrolytes and the like. These substances cause a change in the electrical charge of the sludge cells and the 'hydration casing, so that more of the water bound' by 'adhesive forces on the large surface of the sludge particle is released. A structural change achieved in this way gives a good thickening during centrifugation, which is close to that which can be achieved by centrifugation of unicellular microorganisms, for example yeast. But even this procedure also entails large costs, especially for polyelectrolytes, the price of which is constantly rising. These disadvantages are eliminated by the process according to the invention, according to which the structural change is effected cheaply, utilizing the enzymatic activity of microorganisms present in biological sludges, in particular in activated sludges.
Den olämpliga fysikaliska slamstrukturen förorsakas, vid sidan av _hydratationshöljet och det extra- _ cellulära vattnet inom slammicellen, även av att en hel radlav de mikroorganismer, som bildar slammet, är omgivna av slemkapslar av polysackaridisk natur. -Eventuellt finns _ dessa ämnen närvarande direkt i cellen. Dessa slemsub- stanser kännetecknas av en avsevärd förmåga att binda vatten, och i princip utgör de den viktigaste orsaken till dålig slamavvattning. Vid hittills gjorda försök att förbättra den fysikaliska slamstrukturen har detta faktum ej öeaktats, och de tillämpade förfarandena har därför varit mindre verksamma. I Förändring av slamstrukturen genom enzymatiska förlopp försöker man åstadkomma först enligt det tjeckiska paten- tet nr. 133 Q46 "Ett förfarande för intjockning av orga- niska slam,"/Barta, Fechtner, Hanzlišek, Verner, Vesely/ och det tjeckiska patentet nr 147 846 "Ett förfarande för minskning av vätskefasen i organiska slam"/ Barta, Dyr, Hanzliëek, Verner, vesely /. Enligt_dessa förfaranè den, som emellertid framför allt är inriktade på s.k. biologisk flotation, uppnås i jämförelse med tryckflo- tationen en väsentligt bättre intjockning av den utflo- terade slamsuspensionsfastfasen, samt en inbesparing av energi. Detta uppnås med hjälp av en styrd fermentering under användning av på förhand odlade rena kulturer elleri ur slamsuspensionen selekterade kulturer av denitrifika- tionsbakterier och med eller utan tillsats av nitratjo- ner. Dessa förfaranden är redan avsevärt mindre kostsamma. men kräver mycket tid. tvåstegshantering och avsevärda behållarvolymer, i vilka kulturerna förbereds och själva 450 893 den biologiska Elotationen genomförs«' Förfarandet för intjockning av biologiska slam, särskilt aktivt slam enligt uppfinningen undanröjer dessa naokdelar.The unsuitable physical sludge structure, in addition to the hydration envelope and the extracellular water within the sludge cell, is also caused by the fact that an entire row of the microorganisms which form the sludge are surrounded by sludge capsules of a polysaccharide nature. -Possibly _ these substances are present directly in the cell. These sludge substances are characterized by a considerable ability to bind water, and in principle they are the most important cause of poor sludge drainage. In attempts made so far to improve the physical sludge structure, this fact has not been disregarded, and the procedures applied have therefore been less effective. In Modification of the sludge structure by enzymatic processes, an attempt is first made to achieve it according to the Czech patent no. 133 Q46 "A procedure for thickening organic sludge," / Barta, Fechtner, Hanzlišek, Verner, Vesely / and Czech Patent No 147 846 "A procedure for reducing the liquid phase in organic sludge" / Barta, Dyr, Hanzliëek, Verner, vesely. According to these procedures, the one which, however, is primarily focused on the so-called biological flotation, a significantly better thickening of the floated sludge suspension solid phase is achieved in comparison with the pressure flotation, as well as an saving of energy. This is achieved by means of a controlled fermentation using pre-cultured pure cultures or cultures of denitrification bacteria selected from the sludge suspension and with or without the addition of nitrate ions. These procedures are already considerably less expensive. but requires a lot of time. two-stage handling and considerable container volumes, in which the cultures are prepared and the biological elotation itself is carried out. The process for thickening biological sludge, in particular activated sludge according to the invention, eliminates these parts.
Grundprincipen är, att slammet tillföres nitrater eller nitriter i en~mängd av 30 till 1000 g/m3,-varpå vid en temperatur av 5 till 45°C och ett nH-värde av 5 till 8,5 efter 15 minuter till 3 timmar genom enzymatisk verkan' uppstâende slamflockar med'ändrad fysikalisk struktur direkt intjockas genom centrifugerinq. ' _Til1 skillnad från förhållandena i de ovan_anförda tjeckiska patenten genomförs processen utan någon som helst vidare till- sats av ytterligare mikroorganismer. Någon långvarig, tiotals timmar varande fermentering förekommer inte och inte heller någon flotation, 'utan endast kortvarig enzymatisk inverkan av i slammet närvarande mikroorganismer, som fiörorsakas av en relativt stor ti11sats.av syrehaltiga kväveföreningar._ Det nämnda förfarandet, enligt vilket man erhåller slamfloc- kar med ändrad struktur, möjliggör en direkt intjockning av utgångsslammet från 1 à 2% torrsubstans till 14 å 16% torr- snbstans (med hjälp av en dekantercentrifug). I Det har nämligen fastställts, att de många olika i slammet närvarande mikroorganismêpopulationerna på mycket kort tid förmår ändra den fysikaliska_strukturen i önskad omfattning.The basic principle is that the sludge is fed to nitrates or nitrites in an amount of 30 to 1000 g / m 3, - at a temperature of 5 to 45 ° C and an nH value of 5 to 8.5 after 15 minutes to 3 hours by enzymatic action 'Emerging sludge flocks with altered physical structure are directly thickened by centrifugation. In contrast to the conditions in the Czech patents cited above, the process is carried out without any further addition of additional microorganisms. There is no long-lasting fermentation lasting tens of hours, nor any flotation, but only a short-term enzymatic effect of microorganisms present in the sludge, which is caused by a relatively large addition of oxygen-containing nitrogen compounds. vessels with changed structure, enables a direct thickening of the starting sludge from 1 to 2% dry matter to 14 to 16% dry matter (by means of a decanter centrifuge). Namely, it has been established that the many different microorganism populations present in the sludge are able to change the physical structure to the desired extent in a very short time.
Mätning av halten löst syre avslöjade, att det lösta syret snabbt förbrukades i slamsuspensionen och att en_anaerob I miljö bildades, som är tillräcklig för en svag verksamhet av de i slammet rikligt företrädda denitrifikationsmikro- organismerna. Vidare fastställdes, att dessa nitratreduce-_ rare vid intensiv verksamhet med hjälp av sin enzymatiska utrustning utnyttjar alemkapslarna som kolhydratkälla. Kol- hydrater är vid sidan av nitrater en förutsättning för deras verksamhet§ Slemkapslarnauspaltas då hydrolytiakt. En del .Ü 450 893 av dessa-nitratreducerane, särskilt Clostridiacease, producerar därtill proteolytiska exoenzymer, som verkar för störande på slammets cellväggsmembraner. Sammanfatt- ningsvis erhålles som resultat av dessa enzymatiska för- lopp en mycket svag nedbrytning, liknande den som äger rum:vid starten av den anaeroba_rötningsprocessen.Measurement of the dissolved oxygen content revealed that the dissolved oxygen was rapidly consumed in the sludge suspension and that an anaerobic environment was formed, which is sufficient for a weak activity of the denitrification microorganisms abundantly represented in the sludge. Furthermore, it was found that these nitrate reducers use the alem capsules as a carbohydrate source for intensive use with the aid of their enzymatic equipment. Carbohydrates are, in addition to nitrates, a prerequisite for their activities§ The mucus capsules are then cleaved hydrolyte. In addition, some of the nitrate reducing agents, especially Clostridiacease, produce proteolytic exoenzymes which act to interfere with the cell wall membranes of the sludge. In summary, as a result of these enzymatic processes, a very weak degradation is obtained, similar to that which takes place: at the start of the anaerobic digestion process.
Förloppet räcker för den nödvändiga strukturförändringen.The process is sufficient for the necessary structural change.
~-Därvid förekommer inte någon minskning av värdet eller förluster av organisk slammassa.~ -There is no reduction in value or losses of organic sludge mass.
För att åstadkomma optimala betingelser för nitratredu- centernas start av sin spontana verksamhet, vilken leder till att den önskade effekten uppnås, behöver man bara säkerställa tillräcklig nitrattillsats och anaerob eller åtminstone mikroaerofil miljö, lämplig temperatur och lämpligt pH-värde. De ingående parametrarna har under-I sökts noggrant. ' e e e' , I Som nitrat-eller nitritföreningar kan med fördel användas natrium-, kalium-, ammonium- och särskilt kalciumnitrat.In order to achieve optimal conditions for the nitrate reducers to start their spontaneous activity, which leads to the desired effect being achieved, it is only necessary to ensure sufficient nitrate addition and anaerobic or at least microaerophilic environment, suitable temperature and suitable pH value. The included parameters have been carefully examined. Sodium, potassium, ammonium and especially calcium nitrate can be advantageously used as nitrate or nitrite compounds.
Det senare används inom jordbruket som konstgödsel. Bero- ende på slammets egenskaper och sammansättning tillsätts' nitraterna i en mängd av 30 till 600 g N03 /m3 slamsuspen- sion, i form av 10 till 20% lösning av.det motsvarande ni-- tratet. Rent allmänt kan sägas, att en optimal_och eko- nomisk tillsats kan bestämmas på så sätt, att N0š -halten i det efter processen avcentrifugerade slamvattnet inte skall vara högre än den ursprungliga NO; halten i den fly- tande fasen i den slamsuspension, som skall bearbetas.The latter is used in agriculture as a fertilizer. Depending on the properties and composition of the sludge, the nitrates are added in an amount of 30 to 600 g NO 3 / m 3 sludge suspension, in the form of a 10 to 20% solution of the corresponding nitrate. In general it can be said that an optimal_and economic addition can be determined in such a way that the NOx content in the sludge water centrifuged after the process should not be higher than the original NO; the content of the liquid phase of the sludge suspension to be processed.
Optimalt pH-värde ligger inom gränserna 7,0-8,5.Optimal pH value is within the limits 7.0-8.5.
Vad beträffar temperaturen, löper processen väl inom tem- peraturgränserna 15 till 37°C, men temperaturen får inte vara lägre än 5°C. Änaeroba betingelser definieras med en halt löst syre av maximalt 0,1 mg 02 /liter slamsus- pension. " ' 04500893 ...6-.As for the temperature, the process runs well within the temperature limits of 15 to 37 ° C, but the temperature must not be lower than 5 ° C. Anaerobic conditions are defined with a content of dissolved oxygen of a maximum of 0.1 mg O 2 / liter sludge suspension. "'04500893 ... 6-.
På ovanstående sätt förenklas processen väsentligt, den för- kortas enormt - vanligen till timmar_ocb minuter - ooh för- billigas myeket både avseende investeringar och driftskostnader, - e Det'förhållande, att floteringseffekten i och för sig är över- flödig vid denna process, gör det möjligt att genomföra för- farandet kontinuerligt i,en relativt liten reaktor; :I fort- sättningen anges exempel på forfarandet enligt uppfinningen.In the above way the process is considerably simplified, it is greatly shortened - usually to hours_ocb minutes - ooh is greatly reduced both in terms of investments and operating costs, - e The fact that the flotation effect itself is superfluous in this process makes it is possible to carry out the process continuously in a relatively small reactor; : The following are examples of the process according to the invention.
Exempel 1 ' 'Till 10 m3 överskottsaktivtslam med en mängd av 80 kg sus- penderad, olöslig substans sättes 3000 g teknisk kalksal- peter i form av 20X-ig lösning." Blandningen homogeniseras 10 till 15 sek. och avcentrifugeras 1 en dekantercentrifug. varvid 550 kg slamkoncentrat med en torrsubstanshalt_av 14% utvinnes; Detta motsvarar 96,252 av den ursprungliga mängden olöst substans. fExemge¿ 2 Till 3000 liter aktivtslamsuspension med en halt av O,8%' suspenherad, olöslig substans får en blandning av 1000 liter slamsuspension och 3 liter lok-ig lösning av teknisk kalksalpeter flyta kontinuerligt per timme. Från reaktorn avgår samtidigt loo3 liter/h slamsuspension med ändrad slam- struktur, som kontinuerligt intjockas i en dekantercentrifug.Example 1 "To 10 m3 of excess active sludge with an amount of 80 kg of suspended, insoluble substance is added 3000 g of technical lime nitrate in the form of a 20X .g solution. The mixture is homogenized for 10 to 15 seconds and centrifuged in a decanter centrifuge. 550 kg of sludge concentrate with a dry matter content_of 14% is recovered; This corresponds to 96,252 of the original amount of undissolved substance. locomotive solution of technical lime nitrate flows continuously per hour.From the reactor at the same time loo3 liters / h sludge suspension with a changed sludge structure departs, which is continuously thickened in a decanter centrifuge.
Man utvinner 56 kg/h slamkoncentrat med en torrsubstanshalt av 14%.56 kg / h of sludge concentrate with a dry matter content of 14% are recovered.
,' I? *w, 'I? * w
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS822450A CS228403B1 (en) | 1982-04-06 | 1982-04-06 | Method of concentration biologic,particularly activated sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE8202201L SE8202201L (en) | 1983-10-07 |
| SE450893B true SE450893B (en) | 1987-08-10 |
Family
ID=5361682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8202201A SE450893B (en) | 1982-04-06 | 1982-04-06 | PROCEDURE FOR INJECTION OF BIOLOGICAL SLAY |
Country Status (7)
| Country | Link |
|---|---|
| CS (1) | CS228403B1 (en) |
| DE (1) | DE3312381A1 (en) |
| DK (1) | DK150083A (en) |
| FR (1) | FR2524459B1 (en) |
| GB (1) | GB2118537B (en) |
| IT (1) | IT1163228B (en) |
| SE (1) | SE450893B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9016505D0 (en) * | 1990-07-27 | 1990-09-12 | Applied Biotechnologies | Restoration and maintenance of the function of a trickling-percolating-filter |
| DE4138667A1 (en) * | 1991-11-25 | 1993-05-27 | Sued Chemie Ag | METHOD FOR DISCHARGING DRAIN CLEANER |
| FR2709304B1 (en) * | 1993-08-23 | 1995-11-24 | Omnium Traitement Valorisa | Process and installation for stabilizing and concentrating sludge with nitrogen oxides. |
| FR2732335B1 (en) * | 1995-03-31 | 1997-06-27 | Omnium Traitement Valorisa | SLUDGE STABILIZATION PROCESS |
| RU2122983C1 (en) * | 1996-01-11 | 1998-12-10 | Государственный научно-исследовательский и проектно-конструкторский институт по развитию и эксплуатации флота "Гипрорыбфлот" | Method of preparing stabilized sludge inoculate and its storage |
| WO2023062228A1 (en) | 2021-10-14 | 2023-04-20 | Ocado Innovation Limited | Systems and methods for order processing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE601668C (en) * | 1931-07-25 | 1934-08-25 | Ferdinand Fraensemeier | Process for maintaining the optimal hydrogen ion concentration for the anaerobic digestion of sewage sludge |
| GB1170618A (en) * | 1967-03-04 | 1969-11-12 | Ceskoslovenska Akademie Ved | A Method of Concentration of Organic Sludges |
| JPS5245582A (en) * | 1975-10-09 | 1977-04-11 | Tokai Denka Kogyo Kk | Solid-liquid separation method of organic waste fluid sludge |
| SU1006394A1 (en) * | 1981-08-07 | 1983-03-23 | Ташкентский Филиал Всесоюзного Научно-Исследовательского Института Водоснабжения,Канализации,Гидротехнических Сооружений И Инженерной Гидрогеологии | Method for treating effluent precipitate |
-
1982
- 1982-04-06 SE SE8202201A patent/SE450893B/en not_active IP Right Cessation
- 1982-04-06 CS CS822450A patent/CS228403B1/en unknown
-
1983
- 1983-04-05 DK DK150083A patent/DK150083A/en not_active Application Discontinuation
- 1983-04-05 IT IT2045983A patent/IT1163228B/en active
- 1983-04-05 FR FR8305514A patent/FR2524459B1/en not_active Expired
- 1983-04-06 DE DE19833312381 patent/DE3312381A1/en active Granted
- 1983-04-06 GB GB8309307A patent/GB2118537B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB8309307D0 (en) | 1983-05-11 |
| CS8202450A (en) | 1982-12-31 |
| CS228403B1 (en) | 1984-05-14 |
| IT8320459A1 (en) | 1984-10-05 |
| DE3312381C2 (en) | 1991-04-25 |
| DK150083D0 (en) | 1983-04-05 |
| FR2524459A1 (en) | 1983-10-07 |
| GB2118537B (en) | 1986-01-08 |
| IT1163228B (en) | 1987-04-08 |
| SE8202201L (en) | 1983-10-07 |
| FR2524459B1 (en) | 1985-11-29 |
| DE3312381A1 (en) | 1983-10-13 |
| GB2118537A (en) | 1983-11-02 |
| IT8320459A0 (en) | 1983-04-05 |
| DK150083A (en) | 1983-10-07 |
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