DE1592994A1 - Process for the extraction of oil or fat from waste water - Google Patents

Description

DIPt ING. DIPTFR JANDE * DR.-ING. M. '* \ ~: 0 BÖNING

PAT "N ι LAWYERS

BERLIN 33 (DAHLEM) HOTTENWEG 11

Specimen copy

May not be changed

ULEFOM 741101 1 5 9 2 9 9 A

69/12 360 DB October 21, 1966.

Patent registration of the company

A / S Pharmacist laboratory for special preparations Oslo. / Norway

Inventor:

CivilingeniOr Sven Erik JOrgeneeni Taatrup a Process for the extraction of oil or fat from

Weather.

The present invention relates to a process for the extraction of fats or oils from sewage, preferably from fishmeal factories or other fish-processing industries, slaughterhouses, legmeal factories, dairies and wool laundries.

Au · the types of sewage mentioned are in several Let fall oils or fats stand by centrifugation, flotation or by scraping off the top layer (fat trap) won. This extraction of oil is more particularly economical Significant when it comes to glue water or waste water from the fillet preparation of herrings, as the oil content of these is high in both types of water (usually 1.5-6%).

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KOB / I B

Using the present invention, the yield of Oil or fat increased in proportion to known methods. Consequently can also affect the oil or fat content of other types of waste water be exploited more economically. Furthermore, according to the invention, the degree of pollution of wastewater is reduced, as is the case with, for example Meaaung dea biological Saueratoff consumptiona can be measured.

According to the invention, ligninsulphonic acid or a derivative of the same or a ligninsulphonic acid-containing material is added to the wastewater by regulating the pH of the wastewater to 2.0-4.5 and, with a view to external separation, the temperature to 80-100 ° C. This happens surprisingly because the oil-in-water emulsion is broken, and a larger amount of oil than is otherwise possible can therefore be separated out. In practical work, you can achieve an oil rescue in the water of O. OZ - OZ %, depending on the type of water, without difficulty. This method also has the advantage that the proteins are precipitated at the same time, so that both components can be grooved out. According to the invention, the most wakeful way to adjust the pH value to 0.1 is that it has increased so that a better yield is achieved, ie the separation of the largest amount of oil (and, by the way, also protein).

It should be noted that practical «work a preliminary separation of part of the oil in and of itself as is known, so that only the water in the untreated condition, a. B. a centrifuge reads and then the lignosulfonic acid susetst and then that like that treated water under the specified conditions by a

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Kwide centrifuge leads, with the separation then being the largest Amount of * residual oil takes place. However, it is not necessary so ftu procedure. The ligninsulphonic acid can advantageously be added before the separation takes place under the conditions mentioned.

The method according to the invention is described below with some examples are explained.

EXAMPLE · I

The so-called glue water from the fishmeal factories contains I.

normally IO - 15%, often around 13 % dry matter (oils and fatty substances are counted here as dry matter; this term here includes all non-aqueous components), which is often made up of approx. 1% cooked corn, 2 x 6% oil and approx. 9% divides proteins, vitamins and other organic matter.

The noraeale method for cleaning glue water and sur Extraction of necessary substances in it is · as much oil as possible through Remove centrifugation and then evaporate the rest. The oil or the fatty substance consists of glycerine esters from |

Saturated and unsaturated fatty acids and are in themselves one valuable product. These oils can be found in glue water as it is from the factory in the form of the disperse phase in a finely divided phase Emulsion comes off, the continuous phase of which is water. in which the other substances are dissolved, possibly in one can be found as suspending particles.

. However, removing the oil from the glue water by centrifugation gives an unsatisfactory result because the glue water after centrifugation in the practice always 1 - 1.5% oil contains and theoretically not to an oil content by centrifugation

009887/0252 bathroom original

▼ on «only approx. 5% (percent by weight) can be brought.

The glue water from a fishmeal factory was passed through a centrifuge in a known manner, with 6 % oil being separated out. After this first centrifugation, the water had a temperature of 70 ° C and the following analysis:

Dry matter: 9.θ %

of which: oil 1.4 %

Proteins 6.0 %

other organic compounds 0.6%

inorganic compounds 1.8%

The oil that has remained in the water can be removed from the glue water cannot be excreted by further or more effective centrifugation.

The water from the first centrifuge was poured into a thermostat-controlled intermediate container with a size of 14 m, in which the temperature of the water was raised to 88 - 90 ° C with the help of steam. From this container the water was pumped through a pipe. Lignin sulfonic acid and sulfur " stubbornly stifled by adding a pH meter was controlled. The Ligninsulfonslure was in a 15% prepared aqueous reading containing 8% sulfuric acid. 10 kg of lignin sulfonic acid were sugesetst per m glue water and the pH was measured to be 5.0 using a pH meter set. Through these lignosulfonstturesusats the Broken emulsion.

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The glue waeaer treated in this way came from the pipeline into a 350 liter container and from there into another centrifuge. In this was centrifuged per m treated · Lieimwasser

10 kg of sludge, containing 69 kg of dry auburn, of which 9 kg LigninsulfonsMure 55 kg proteins and 5 kg are other substances,

eliminated.

In addition, the centrifuge removed 11 kg * approx. 12 l of oil • Eliminated separately. The water going off the centrifuge had the following analysis:

Dry matter: ■ 2.8 %

Of which: Proteins 0.5 % inorganic compounds *

Ties 1.8 %

oil O.3%

other 0.2 % I.

Since oil (both from the first and second centrifugation) was sent for refining and the sludge in a dryer dried together with the press cake from the fishmeal factory.

It is also to be noted that ·· the approached analyzes Average analyzes of an 8 permanent activity are »in which Period the system was passed by a total of 15.3 m of glue water.

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If centrifugation »1 · separation method is specified in the above approach, it is to be understood that other separation methods known in the field of mechanical processes can also be used.

EXAMPLE η

Wastewater from a herring fillet plant would be subjected to centrifugation with and without the addition of lignin sulphate subject. The water was analyzed before and after the treatment based on average samples, which are so that water were taken before and after centrifugation every half hour for a period of 5 hours in both Skins was taken. In every period "134 ro happened Water. In the case where lignosulfonic acid was sugosetat, 68 kg of pure "sodium lignosulfonic acid" and 60 kg of sulfuric acid were used applied.

Analvaeervebnia ··!

Water at
Centrifugation: Water after
without Zuaata Centrifugation
with Zuaata Dry matter % 1.55 1.03 0.82 Protein% O. 76 O. 7O O. 36 Oil% O. 76 0.24 0.06

Di ·· means that the oil separation effect was:

ohn Zueate: 0 ^ 52 _{χ lQQ m 69%}

0.76

COPY 009887/0252

with Zusata. qjj

U. ro

EXAMPLE ΙΠ

2 χ 9 tn What aar were made from a herLtgaiiletfabrik Subjected to flotation by adding 8 kg Sodium lignin sulphate and 6 kg sulphurous acid acetate became. After the flotation, the top layer was scraped off and aentriligated after heating to 80 C. Dae Purified waeaer was after flotation and zetotrifagation analyzed in the two FtUe:

Waaaer before Waaaer after Flo'Afion Waeaer after flotation centrifugation

m. Zua. o. Zuj. with add. o. Zua.

Dry matter % 1. 58 1. O2 1. 39 Ο / Ϊ3 O. 60 Protein % O. 81 O. 57 0. Γ9 O6 O. 6O Oil % O. 56 O. O8 O. 16 O.O9 O. 14th EXAMPLE. IV

2 x2O 1 Abwaaaer was · »by an arbitrator«]! except. One part was given 8 g of lUtrium ligninautfonftaur " and Sg korn. Η, βΟ. eyesight. Both shares were b «i Stand at room temperature in 2 hours, with a calibration Foam formed on the surface and a part of it formed aedixnentiert. The relatively clear waeaer in the middle and that Auagangewaaeer was analyzed;

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BAD CfIIGINAL Unb «aand« lt ·· Waster aUb «nd in 2 positions

with ZumU without Zuaats

Dryness off% 0.62 0.12 0.35

Fat % 0.18 0.04 O. OK

Protein % 0.25 0.04 O.2O

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Claims (3)

Claims 1. Process for the extraction of oil and fat from waste water by separation »characterized in that before the separation of the wastewater, ligninsulphonic acid or a derfarate thereof or ligninsulfonslturehaltigea material susetat, indent the pH word of the sewage is adjusted to 2.0 - 4. 5. 2. The method according to claim 1, characterized in that that the pH value is regulated to 3.0. / 3. The method according to claim 1 and 2, characterized in that that the temperature of the wastewater is set to 8O - 1OO ° C will. 0OJG.NAL INSPiCTEO 009887/0252