DK143656B - PROCEDURE FOR THE RECOVERY AND STABILIZATION OF FAT AND FAT MATERIALS AND PROTEIN AND PROTEIN MATERIALS FROM PROCESS WATER - Google Patents

PROCEDURE FOR THE RECOVERY AND STABILIZATION OF FAT AND FAT MATERIALS AND PROTEIN AND PROTEIN MATERIALS FROM PROCESS WATER Download PDF

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DK143656B
DK143656B DK67874AA DK67874A DK143656B DK 143656 B DK143656 B DK 143656B DK 67874A A DK67874A A DK 67874AA DK 67874 A DK67874 A DK 67874A DK 143656 B DK143656 B DK 143656B
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fat
protein
sludge
process water
materials
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DK143656C (en
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G Hall
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Apothekernes Lab
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23JPROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
    • A23J1/00Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites
    • A23J1/001Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites from waste materials, e.g. kitchen waste
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11BPRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B13/00Recovery of fats, fatty oils or fatty acids from waste materials
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/74Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Biochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Inorganic Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Removal Of Specific Substances (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Fats And Perfumes (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Treatment Of Sludge (AREA)

Description

ns) DANMARK \S[)ns) DENMARK \ S [)

|j| ( 2) FREMUEGGELSESSKRIFT (11) 1436-56 B| J | (2) PROCEDURE WRITING (11) 1436-56 B

DIREKTORATET FOR PATENT· OG VAREMÆRKEVÆSENETDIRECTORATE OF PATENT AND TRADEMARKET

(21) Ansøgning nr. 678/7^· (51) lnt.CI.3 C 11 ® 13/00 (22) Indleveringsdag 8. feb. 197^ (24) Løbedag 8. feb. 197^· (41) Aim. tilgængelig 10. aug. 1974 (44) Fremlagt 21. sep. 1981 (86) International ansøgning nr.(21) Application No. 678/7 ^ · (51) lnt.CI.3 C 11 ® 13/00 (22) Filing date Feb 8 197 ^ (24) Running Day Feb 8 197 ^ · (41) Aim. available Aug. 10 1974 (44) Posted Sep 21 1981 (86) International application no.

(86) International indleveringsdag (85) Videreførelsesdag - (62) Stamansøgning nr. -(86) International filing day (85) Continuation day - (62) Master application no. -

(30) Prioritet 9. féb. 1973, 539/73, NO(30) Priority 9th Feb. 1973, 539/73, NO

(71) Ansøger A/S APOTHEKERNES LABORATORIUM FOR SPECIALPRÆPARATER, N-Oslo 2, NO.(71) Applicant A / S APOTHEKERNES LABORATORY FOR SPECIAL PREPARATIONS, N-Oslo 2, NO.

(72) Opfinder Gunnar Hall, NO.(72) Inventor Gunnar Hall, NO.

(74) Fuldmægtig Kontor for Industriel Eneret v. Svend Schønning.(74) Clerk of the Office of Industrial Excellence v. Svend Schønning.

(54) Fremgangsmåde til genvinding og stabilisering af fedt og fedt» lignende stoffer og protein og proteinlignende stoffer fra pro= cesvand.(54) Process for the recovery and stabilization of fat and fat 'like substances and protein and protein-like substances from process water.

Procesvand og afløbsvand fra næringsmiddelindustrier indeholder ofte store mængder fedt, fedtlignende stoffer, proteiner og proteinlignende stoffer som repræsenterer en ikke ubetydelig potentiel værdi. De nævnte stoffer bidrager i øvrigt væsentligt til en tildels kraftig forurening ved at det let nedbrydes aerobt Q og dermed forstyrrer oxygenbalancen i recipienter.Process water and wastewater from food industries often contain large amounts of fat, fat-like substances, proteins and protein-like substances that represent a not insignificant potential value. The said substances, moreover, contribute significantly to a considerable amount of pollution by easily decomposing aerobically Q and thus disturbing the oxygen balance in recipients.

G Den foreliggende opfindelse angår en fremgangsmåde til -j genvinding af stoffer fra fedtraf finerende industrier, margarine- £ industrier og andre næringsmiddeliniustrier, hvorved man foruden at opnå en vandrensningseffekt også opnår at de genvundne stof-^ fer får forøget stabilitet.G The present invention relates to a process for recovering substances from the grease veneer industries, margarine industries and other food industries, whereby, in addition to obtaining a water purification effect, the recovered substances also obtain increased stability.

2 1436562 143656

Det er kendt at man kan bruge fx surt hydrolysernnde 3+ 3+ metalsalte som flokkuleringsmiddel, fx Fe -salte og Al -salte. Det er desuden kendt at disse salte også har en deemulge-rende effekt samt en effekt som bevirker at kolloidale proteinsystemer brydes. Ulempen ved brug af denne type salte i forbindelse med nævnte procesvand er at de virker som katalysatorer for autooxydation af fedtagtige stoffer og således nedsætter værdien af disse som genvundet materiale ved at der dannes ketoner, peroxyder og aldehyder.It is known that one can use, for example, acid hydrolyzing 3+ 3+ metal salts as a flocculant, for example Fe salts and Al salts. In addition, it is known that these salts also have a demulsifying effect as well as an effect that causes colloidal protein systems to break. The disadvantage of using this type of salts in connection with said process water is that they act as catalysts for the autoxidation of fatty substances and thus reduce their value as recovered material by the formation of ketones, peroxides and aldehydes.

Ted fremgangsmåden ifølge den foreliggende opfindelse 3+ indgår det surt hydrolyserende metalsalt, fx et Fe -salt, i en kompleks forbindelse med fedtstofferne. Efter god omblanding og tilstrækkelig reaktionstid tilsættes der et jordalkalimetalhy-droxyd, fx CaCOH^, hvorefter komplekset udfældes som et ko-præ-cipitat som kan separeres ved sedimentation, centrifugering eller flotation som et slam. Dette kompleks, fx Fe-fedt-Ca, er uopløseligt ved tilsætning af stærk mineralsyre ved stuetemperatur, noget der er en tydelig indikation på at det her ikke drejer sig om udfældede metalhydroxyder, men om et syreuopløseligt kompleks .For the process of the present invention 3+, the acidic hydrolyzing metal salt, e.g., a Fe salt, is included in a complex compound with the fats. After good mixing and sufficient reaction time, an alkaline earth metal hydroxide, eg CaCOH 2, is added, after which the complex precipitates as a co-precipitate which can be separated by sedimentation, centrifugation or flotation as a sludge. This complex, eg Fe-fat-Ca, is insoluble by the addition of strong mineral acid at room temperature, which is a clear indication that this is not a precipitated metal hydroxide but an acid-insoluble complex.

Det har vist sig at slammet får en væsentligt større stabilitet end fx Fe(OH)^-fedt-slam, hvor fedt er adsorberet, noget som tyder på at metalionens katalytiske effekt er hæmmet, muligvis ved chelatering. Se kurver til eksemplerne 1, 2 og 3, nemlig fig. 1-4.It has been found that the sludge has a significantly greater stability than, for example, Fe (OH) 2 - fat sludge where fat is adsorbed, suggesting that the catalytic effect of the metal ion is inhibited, possibly by chelation. See curves for Examples 1, 2 and 3, viz. 1-4.

I procesvand fra næringsmiddelindustrien forekommer fedt og proteiner i varierende forhold. Dersom proteinmængden er væsentlig i forhold til fedtmængden, dvs. udgør mere end 10?/o af den samlede faststofmængde i procesvandet, kan det være nødvendigt at sænke pH-værdien med en mineralsyre til linder 4 før, samtidig eller efter tilsætningen af det surt hydrolyserende metalsalt. Dette viser sig at være helt nødvendigt for en effektiv kompleksdannelse ved vandopløselige proteiner, men mindre nødvendigt for kolloidalt protein/fedtholdigt procesvand.In process water from the food industry, fat and proteins occur in varying ratios. If the amount of protein is significant in relation to the amount of fat, ie. constituting more than 10 µ / o of the total solids in the process water, it may be necessary to lower the pH with a mineral acid to liner 4 before, simultaneously or after the addition of the acidic hydrolyzing metal salt. This proves to be absolutely necessary for efficient complexation of water-soluble proteins, but less necessary for colloidal protein / fatty process water.

Efter tilsætning af jordalkalimetalhydroxydet udfældes komplekset også her som et kopræcipitat,der kan separeres ved sedimentation, centrifugering eller flotation, og slammet er uopløseligt ved tilsætning af stærk mineralsyre. Dette slam kan have stor værdi i fx forblandinger hvor det er vigtigt at undgå oxyda- 3 143656 tLorsprodukter af fedt som har vist sig at være toksiske.After addition of the alkaline earth metal hydroxide, the complex also precipitates here as a coprecipitate which can be separated by sedimentation, centrifugation or flotation and the sludge is insoluble by the addition of strong mineral acid. This sludge can be of great value in, for example, premixes where it is important to avoid oxidized fatty products which have been found to be toxic.

En kompleksudfældning af proteinerne som gennemført ifølge nærværende opfindelse giver ved påfølgende varmebehandling og tørring også en forbedret fordøjelighed i sammenligning med syrefældede proteiner, fordi udfældningen af komplekset sker 11 neutralt pH-område. Dette fremgår af kurven i fig. 5 vedrø- -i rende fordøjelighed stillet op mod pH.A complex precipitation of the proteins carried out in accordance with the present invention also provides improved digestibility with subsequent heat treatment and drying compared to acid-precipitated proteins because the precipitation of the complex occurs at 11 neutral pH range. This is shown in the curve in FIG. 5 regarding digestibility set against pH.

I stedet for at bruge et Jordalkalimetalhydroxyd er det også muligt ved fremgangsmåden ifølge den foreliggende opfindelse at bruge alkalimetalhydroxyd såfremt et Jordalkalimetalsalt allerede er til stede.Instead of using an alkaline earth metal hydroxide, it is also possible in the process of the present invention to use alkali metal hydroxide if an alkaline earth metal salt is already present.

I mange tilfælde vil det være en betingelse for separation ved flotation, at en anionisk polyelektrolyt tilsættes efter Jordalkalimetalhydroxydet. Flotation vil i de fleste tilfælde, være det mest aktuelle princip, da man ved denne behandling kan opnå en slamkoncentration på 15% eller mere.In many cases, it is a condition of separation by flotation that an anionic polyelectrolyte is added after the alkaline earth metal hydroxide. Flotation will in most cases be the most current principle, as this treatment can achieve a sludge concentration of 15% or more.

Eksempel 1Example 1

Ved forsøget brugtes der procesvand fra en margarinefabrik. Der udførtes tre sammenligningsforsøg; 1) Procesvandets indhold af fedt blev separeret ved mi-kroflotation, dvs. ved tilsætning af vand som er luftmættet ved et tryk på 4 ato. Genvindings resultatet fremgår af nedenstående tabel 1. Det fedt som floterede, blev benyttet ved autooxy-dationsforsøg.The test used process water from a margarine plant. Three comparative experiments were performed; 1) The fat content of the process water was separated by micro flotation, ie. by adding water which is air-saturated at a pressure of 4 ato. The recovery result is shown in Table 1 below. The fat which floated was used in autooxidation experiments.

2) Der blev sat Jem(III)-klorid og kalk til procesvandet på kendt måde. Ved denne behandling dannedes der fnok som blev flotteret på den ovenfor beskrevne måde. Slammet blev derefter skrabet af og benyttet til autooxydationsforsøget. Genvindingsresultatet fremgår af tabel 1.2) Jem (III) chloride and lime were added to the process water in known manner. In this treatment, flocs were formed which floated in the manner described above. The sludge was then scraped off and used for the autoxidation test. The recovery results are shown in Table 1.

3) Der blev sat jem(Hl)-klorid til procesvandat samt, syre i tilstrækkelig mængde til at sænke pH-værdien til under 4, hvorefter der blev tilsat kalk til pH 7,5· Det udfældede materiale flotteredes og slammet benyttedes til autooxydationsforsøget. Genvindingsresultaterne fremgår af tabel 1.3) Iron (H1) chloride was added to process water as well as, acid in sufficient quantity to lower the pH to less than 4, after which lime was added to pH 7.5. The recovery results are shown in Table 1.

4 14355$$ 14,355

Tabel 1Table 1

Prøve Forsøg Fedt mg/1 Genvundet, .¾ råvand - 1780Sample Trial Fat mg / 1 Recycled, .¾ raw water - 1780

Effl. 1) 872 51Effl. 1) 872 51

Effl. 2) 157 91,7Effl. 2) 157 91.7

Effl. 3) 52 97,8Effl. 3) 52 97.8

For at bestemme stabiliteten i det genvundne fedt over for autooxydation blev anisidin-værdien, som bestemtes ifølge U.P.A.C. standard-metode brugt som parameter.To determine the stability of the recovered fat against auto-oxidation, the anisidine value, as determined by U.P.A.C. standard method used as parameter.

Anisidin-værdien fortæller om fedtet/oliens indhold af aldehydforbindelser og karbonylstoffemes struktur, og bruges 1 dag som en indikatoranalyse for fedtet/oliens kvalitet. Ved autooxydationsforsøget blev de tre slamprøver vejet således at man havde lige stor fedtmængde. Prøverne blev derefter placeret på et termostatstyret vandbad ved 80°C - 1°, og der blev boblet luft igennem. Ved tidsintervaller blev delprøver udtaget, fedt ekstraheret og anisidinværdier målt. Fig. 1 viser resultaterne af de nævnte autooxydationsforsøg.The anisidine value tells about the fat / oil content of aldehyde compounds and the structure of the carbon compounds, and is used for 1 day as an indicator analysis for the fat / oil quality. In the auto-oxidation test, the three sludge samples were weighed to have an equal amount of fat. The samples were then placed on a thermostatically controlled water bath at 80 ° C - 1 ° and air was bubbled through. At time intervals, subsamples were sampled, fat extracted and anisidine values measured. FIG. 1 shows the results of said autoxidation experiments.

Kurverne viser at fedtindholdet i slam fra forsøgene 1 og 2 blev oxyderet betydeligt hurtigere end fedtindholdet i slam fra forsøg 3, hvilket slam er genvundet ved hjælp af fremgangsmåden ifølge nærværende opfindelse. Forsøgene viser således at fedtindholdet i slam fra forsøg 3 er væsentligt mere stabilt end fedtindholdet i slam fra forsøg J og 2.The curves show that the fat content of sludge from experiments 1 and 2 was oxidized significantly faster than the fat content of sludge from experiment 3, which sludge was recovered by the method of the present invention. Thus, the experiments show that the fat content of sludge from Experiment 3 is substantially more stable than the fat content of sludge from Experiments J and 2.

Eksempel 2 I dette forsøg anvendtes der procesvand fra talgsmelteri. Vandet er svagt alkalisk, har en brunlig farve og er blakket af emulgeret fedt. Procesvandet blev behandlet på samme måde som beskrevet i eksempel 1. Resultaterne fra genvindingen af fedt fremgår af tabel 2.Example 2 In this experiment, process water from sebum smelting was used. The water is slightly alkaline, has a brownish color and is bleached with emulsified grease. The process water was treated in the same manner as described in Example 1. The results from the recovery of fat are shown in Table 2.

, 143β$6 5, 143β $ 6 5

Tabel 2Table 2

Prøve Forsøg Fedt mg/l Genvinding 1 % råvand - 1140Sample Experiment Fat mg / l Recovery 1% raw water - 1140

Effl. 1 1 106 90,7Effl. 1 1 106 90.7

Effl. 22 93 91,8Effl. 22 93 91.8

Effl. 33 36 96,4Effl. 33 36 96.4

For at undersøge fedtslammets stabilitet blev "The Oxygen Bomb Test" benyttet. Dette er en metode hvor man indfører den aktuelle prøve i et kammer som sættes under overtryk af luft. Kammeret med prøven opvarmes til en vis temperatur, og den indtrådte trykreduktion på grund af fedtets oxygenoptagelse aflæses kontinuerligt. Denne analyse giver eb mål for autooxydationen som funktion af tiden. Fig. 2 viser resultaterne af disse forsøg.To examine the stability of the fat mud, "The Oxygen Bomb Test" was used. This is a method where the current sample is introduced into a chamber which is put under pressure of air. The chamber with the sample is heated to a certain temperature and the pressure reduction due to the oxygen uptake of the fat is read continuously. This analysis gives eb measure of the autoxidation as a function of time. FIG. 2 shows the results of these experiments.

Kurverne viser at fedtindholdet i slam fra forsøg 1 og forsøg 2 oxyderedes betydeligt hurtigere end fedtindholdet i 'slam fra forsøg 3, hvilket slam er udvundet ved hjælp af fremgangsmåden ifølge den foreliggende opfindelse.The curves show that the fat content of sludge from Experiment 1 and Experiment 2 was oxidized significantly faster than the fat content of sludge from Experiment 3, which sludge was recovered by the process of the present invention.

Eksempel 3Example 3

Ved dette forsøg blev der anvendt procesvand fra et slagteri for svin og kreaturer. Procesvandet havde pH= 6,8, det var rødfarvet af blodproteiner og indeholdt en del suspenderede partikler. Vandets indhold af fedt var forholdsvis lavt i forhold til proteinindholdet.In this experiment process water from a slaughterhouse for pigs and cattle was used. The process water had pH = 6.8, it was red-colored by blood proteins and contained some suspended particles. The water content of fat was relatively low in relation to the protein content.

Forsøg: 1) Flokkulering med jern(III)-klorid. Der tilsattes procesvandet forskellige mængder FeCl^ og flokkuleredes.Experiments: 1) Flocculation with iron (III) chloride. Various amounts of FeCl 2 were added to the process water and flocculated.

De dannede fnok var forholdsvis stabile og flotterede ved tilsætning af dispersionsvand (luftmættet vand ved 4 ato).The flocs formed were relatively stable and flotated by the addition of dispersion water (air saturated water at 4 ato).

Der dannedes et voluminøst slam. Væskefasen under slammen var fremdeles rødfarvet af blodproteiner, og dette viser at metoden ikke egner sig til udfældning af nævnte proteiner. Suspenderet materiale blev derimod effektivt reduceret. Resultater vises i tabel 3.A bulky sludge formed. The liquid phase under the sludge was still red-colored by blood proteins, and this shows that the method is not suitable for precipitation of said proteins. Suspended material, on the other hand, was effectively reduced. Results are shown in Table 3.

6 1433S6 2) Flokkulering med jem( III)-klorid + kalk.6 1433S6 2) Flocculation with iron (III) chloride + lime.

Der tilsattes procesvandet forskellige mængder FeCl^, og pH blev reguleret til pH=7,5 med Ca(0H)2· Fnokkene flotte-rede let ved tilsætning af dispersionsvand, men udgjorde et relativt voluminøst slam. Væskefasen under slammet var fremdeles rødfarvet, og dette beviser at denne metode heller ikke var egnet til genvinding af blodproteiner. Resultaterne vises i tabel 3.Various amounts of FeCl 2 were added to the process water, and the pH was adjusted to pH = 7.5 with Ca (OH) 2. The flakes easily floated by the addition of dispersion water but formed a relatively voluminous slurry. The liquid phase under the sludge was still red in color, and this proves that this method was also not suitable for the recovery of blood proteins. The results are shown in Table 3.

3) Der tilsattes procesvand forskellige mængder FeCl^ med efterfølgende surgøring med HgSO^ til en pH-værdi under 4. Efter en vis omblandings- og reaktionstid blev der tilsat Ca (0H)2 til pH 7,5. Ved denne behandling fik man dannet stabile fnokker, som efter tilsætning af dispersionsvand hurtigt steg til overfladen og der udgjorde et relativt koncentreret slam. Væskefasen under slammet blev ved denne behandling klar og farveløs. Resultaterne vises i tabel 3, hvor S.t. står for suspenderet tørstof.3) Different amounts of FeCl 2 were added to process water with subsequent acidification with HgSO 4 to a pH below 4. After a certain mixing and reaction time, Ca (OH) 2 was added to pH 7.5. In this treatment, stable flocs were formed which, after the addition of dispersion water, rapidly rose to the surface and formed a relatively concentrated sludge. The liquid phase under the sludge became clear and colorless in this treatment. The results are shown in Table 3, where S.t. stands for suspended solids.

T a b e 1 3T a b e 1 3

Prøve Forsøg mg/1 % mg/l % mg/lSample Test mg / 1% mg / l% mg / l

Proteiner Genvundet Fedt Gen- „ t vundet °' * Råvand - 940 - 306 - 468Proteins Reclaimed Fat Did Not Win * Raw Water - 940 - 306 - 468

Effl. 1 1 560 40,5 44 85,6 56Effl. 1 1 560 40.5 44 85.6 56

Effl. 2 2 410 56,3 37 87,9 44Effl. 2 2 410 56.3 37 87.9 44

Effl. 3 3 37 90,75 29 90,5 31Effl. 3 3 37 90.75 29 90.5 31

De tre erholdte slamtyper indhholdt det væsentligste af procesvandets fedt, og undersøgelser med hensyn til stabilitet ved • autooxydation udførtes.The three types of sludge obtained contained most of the process water's fat, and studies on stability by • autoxidation were conducted.

De tre slamtyper behandledes som i eksempel 1, dvs. med varme og rigelig tilgang af luft ved gennemblæsning. Der udtoges prøver ved forskellige tidsintervaller, og peroxydværdi og fedtets egen-ekstinktion måltes, se fig. 3, hhv. 4.The three sludge types were treated as in Example 1, ie. with warm and ample supply of air by blow-through. Samples were taken at different time intervals, and peroxide value and fat self-extinction were measured, see fig. 3, respectively. 4th

Peroxydværdien blev bestemt ifølge A.O.A.C. standardmetoden, og er udtryk for fedtets oxydationsgrad. Kurverne fra fig. 3 viser at fedtindholdet i slam fra forsøg 1 og 2 oxyderer betydeligt hurtigere end fedtindholdet i slam fra forsøg 3, hvilket slam er genvundet ved hjælp af fremgangsmåden ifølge nærværende opfindelse.The peroxide value was determined according to A.O.A.C. standard method, and is an expression of the degree of fat oxidation. The curves of FIG. 3 shows that the fat content of sludge from experiments 1 and 2 oxidizes considerably faster than the fat content of sludge from experiment 3, which sludge is recovered by the method of the present invention.

7 U3$S67 U3 $ S6

Til bestemmelse af fedtets egen-ekstinktion anvendes samme metode som til bestemmelse af anisidinværdien. Egenekstinktionen for fedt er et udtryk for fedtets oxydationsgrad og stabilitet, idet et ustabilt fedt hurtigt vil farves på grund af blandt andet oxydation. Kurverne fra fig* 4 viser at fedtindholdet i slam fra forsøg 1 og 2 er betydeligt mere ustabilt end fedt i slam fra forsøg 3, hvilket slam er genvundet ved hjælp af fremgangsmåden ifølge nærværende opfindelse.For the determination of fat self-extinction, the same method as for determining the anisidine value is used. The self-extinction of fat is an expression of the degree of oxidation and stability of the fat, since an unstable fat will quickly stain due to, among other things, oxidation. The curves of Fig. 4 show that the fat content of sludge from experiments 1 and 2 is considerably more unstable than fat in sludge from experiment 3, which sludge is recovered by the method of the present invention.

Når det gælder fordøjeligheden af proteinholdigt materiale ved vi fra tidligere forsøg at pH under tørring må ligge i det neutrale område. Fig. 5 viser %-fordøjelighed ved forskellige pH-værdier under tørringen. Forsøget giver anledning til at tro at Fe-protein-komplekset vil have en forholdsvis stor fordøjelighed.When it comes to digestibility of proteinaceous material, we know from previous experiments that the pH during drying must be in the neutral range. FIG. 5 shows% digestibility at various pH values during drying. The experiment gives reason to believe that the Fe-protein complex will have a relatively high digestibility.

Patentet omfatter ikke den omhandlede fremgangsmådes anvendelse ved tilvirkning af næringsmidler.The patent does not cover the use of the present process in the manufacture of foodstuffs.

DK67874A 1973-02-09 1974-02-08 PROCEDURE FOR THE RECOVERY AND STABILIZATION OF FAT AND FAT MATERIALS AND PROTEIN AND PROTEIN MATERIALS FROM PROCESS WATER DK143656C (en)

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DK (1) DK143656C (en)
ES (1) ES423041A1 (en)
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GB (1) GB1468091A (en)
IT (1) IT1054161B (en)
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GB8715155D0 (en) * 1987-06-25 1987-08-05 Laporte Industries Ltd Purification of waters
HU9202203D0 (en) * 1990-01-29 1992-12-28 Yasuyuki Sakurada Apparatus for purifying sewage water
US5614102A (en) * 1990-01-29 1997-03-25 Sakurada; Yasuyuki Method for purifying sewage

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AT333399B (en) 1976-11-25
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JPS49111465A (en) 1974-10-23
SE392284B (en) 1977-03-21
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NL7401779A (en) 1974-08-13
DE2405874A1 (en) 1974-08-29
DK143656C (en) 1982-03-01
GB1468091A (en) 1977-03-23
IT1054161B (en) 1981-11-10
BE810760A (en) 1974-05-29
AU6485274A (en) 1975-07-24
PL107854B1 (en) 1980-03-31
ZA74855B (en) 1974-12-24
BR7400944D0 (en) 1974-11-05
FR2217414A1 (en) 1974-09-06

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