JPH0790223B2 - Treatment method of fish water extract - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a novel method for treating an extract of fish meat water by a membrane utilization technique.

(Prior art and its problems) Generally, when fish meat is produced, a large amount of water is exposed to water, and a large amount of water is exposed to drainage. When this waste liquid is discarded, it must be purified to below the regulated value, and the waste water treatment for that purpose is performed, and at the same time, the active ingredient is also recovered. Although various means such as an agglutination method and an activated sludge method have been conventionally used for the treatment of such a fish meat water-extract containing a protein such as water-exposed effluent, the ultrafiltration method is often practiced.

The ultrafiltration method is effective in various aspects such as removal of unnecessary substances from raw material solutions and recovery of valuable components, and water molecules, inorganic salts, low molecular weight peptides, etc. are well separated when treating fish meat water extract. However, the concentration and recovery rate of the high-molecular-weight aqueous solution protein becomes very slow, and the clogging phenomenon occurs. For this reason, a method of ultrafiltration of the fish meat water extract under the conditions of a specific temperature and pH is proposed in Japanese Patent Publication No. 58-42742, and the concentration or permeation rate is improved, and the clogging phenomenon is suppressed.
It is attracting attention as an industrially and economically feasible wastewater treatment method.

However, even when adjusted under such specific conditions and carried out by the ultrafiltration method, for example, the permeation rate after 1 hour is 200 / m ² -hr or less, which is not suitable for large-scale wastewater treatment. Is still insufficient.

〔Purpose〕

Thus, the object of the present invention is to provide a method capable of treating a fish meat aqueous extract with extremely high efficiency.According to the studies and experiments conducted by the present inventors, It has been found that such an object can be achieved by precisely over-treating a fish meat water extract by a cross-flow method.

〔Constitution〕

Therefore, the present invention uses the fish meat water extract at a temperature of 35 to 80 ° C. and a pH of 4.0.
The present invention provides a method for treating a fish meat water extract, which comprises performing precision overtreatment by a cross-flow method under the conditions of up to 6.0.

[Specific Description of the Invention]

In the present invention, the precision overmembrane is not used but the precision overtreatment is carried out particularly by the cross-flow method.

The main purpose of the ultrafiltration membrane is the molecular weight fractionation of several thousand to several hundred thousand, and it can separate high-molecular substances and low-molecular substances and block soluble substances. The main purpose is to prevent fine particles with a membrane having a pore size of 0.1 to 10 microns and a high porosity, which are significantly larger than the membrane. Due to such a difference in purpose and properties, there is a large difference in handling ability between the two.For example, the operating pressure is 1.0 to 8 kg / cm ² for the ultraperitoneum, but 0.3 μm for the precision hypermembrane.
It can be carried out at a pressure of up to 1.0 kg / cm ² , and the permeation flux can be considerably improved.

For precision membranes, there are various types such as circular disc type, cartridge type, etc. depth filters, screen type membrane filters, etc. Is a cross-flow method. In the former method, the liquid to be treated flows through the membrane at right angles to form a cake on the membrane, and in the latter cross-flow method, the liquid to be treated flows on the surface of the membrane and the excess liquid is the liquid to be treated. Since it flows in a direction perpendicular to the flow of the liquid, part of the deposit can be removed by the liquid, and if the structure allows backwashing, clogging of the membrane pores can be suppressed by backwashing and the permeation flux can be extended. It can also be maintained for a stable period.

In the present invention, the fish meat extract is subjected to precision overtreatment by a cross-flow method, which has a recently developed nominal 0.1
It is possible to use an internal pressure type cross-flow type precision membrane module in which a plurality of hollow fiber-shaped and tubular membranes having a pore size of ˜10 μm are stacked.

Thus, in the present invention, in the precision overtreatment of the fish meat water extract by the cross-flow method, the solution is adjusted to a specific temperature and pH range, and the temperature is heated to a range of 35 to 80 ° C. Keep the pH in the range of 4.0 to 6.0 by adding acid such as hydrochloric acid and acetic acid. By adjusting the specific temperature and pH range in this way, the permeation rate or flux can be remarkably improved as compared with the case of the normal pH range or normal temperature fish meat water extract.

Similarly, by performing precision cross-flow filtration, the permeation flux is considerably low, as in the case of ultrafiltration, or when treated with the above-mentioned disc-type or cartridge-type precision permeation membrane, or liquid passage. Immediately after that, the permeation performance is excellent without difficulty such that the permeated liquid cannot be obtained immediately, and the treatment can be performed extremely efficiently (see each example described below).

The fish meat water extract to which the method of the present invention is applied is not limited to the above water-exposed drainage, and it goes without saying that it also contains various protein-containing drainages that are discharged during the washing treatment of various fish meats.

The permeated liquid obtained by precision passing according to the present invention has a liquid temperature of 35-
It can be further treated with an ultrafiltration membrane and / or a reverse osmosis membrane while maintaining the temperature at 80 ° C.

〔Example〕

Example 1 The liquid obtained by passing the bleached wastewater obtained from the offshore pollack surimi process through a 27-mesh wire net was used as a sample stock solution for precision and ultrafiltration. The composition of the sample stock solution is as shown in Table 1. In the case of precision filtration, divide it into four, and in the case of ultrafiltration, divide it into two and adjust the pH and temperature of each sample to the second.
It adjusted like Table and Table 3. No. 1 in Table 2 shows the case of the present invention.

Precision filter has a pore size of 0.2 micron, manufactured by Nitto Electric Industry Co., Ltd.
Cross Flow Type Precision Over Module NTM-9002-C1
The ultrafiltration was carried out using an ultrafiltration membrane module NTU-35100 manufactured by Nitto Electric Industry Co., Ltd. having a molecular weight fraction of 100,000.

Precise operating pressure (kg / cm ² ) is module inlet pressure 0.
7. The outlet pressure was 0.3, and the operating pressure of ultra-excess was 6.4 at the inlet and 3.8 at the outlet.

The results obtained with precision in the four samples in Table 2 are
The results obtained by ultrafiltration with the two samples of Table, FIG. 1 and Table 3 are shown in Table 5 and FIG. 2, respectively. It is clear from FIG. 1 that the permeation flux in the case of the present invention is remarkably excellent at around 500 / m ² · hr and that it is stably maintained at a high level for a long period of time.

Example 2 Permeation performance of Alaska pollack bleaching effluent (Table 1) was examined using a cartridge filter (Micropore 2A type manufactured by Organo Co., Ltd., pore size 0.22 μm) of a precision overfilter.
The sample was supplied at a liquid temperature of 20 ° C. and a pressure of 0.3 kg / cm ² .

A permeate (about 80 ml) could be obtained for 1 to 2 minutes at the beginning of the passage, but immediately after that the pressure loss became 0.4 to 0.5 kg / cm ² and no permeate could be obtained.

Hydrochloric acid was added to the bleached effluent of Squesondala until pH = 5.0, the liquid temperature was further raised to 40 ° C., a sample was prepared, and the permeation performance was examined using the same cartridge filter as above.

The sample was supplied at a pressure of 0.3 kg / cm ² . A permeate (about 200 ml) could be obtained during the initial 4 to 5 minutes of the passage, but immediately after that, the pressure loss became 0.4 to 0.5 kg / cm ² , and the permeate was hardly obtained.

Example 3 Alaska pollack bleaching effluent (Table 1) was measured using a flat membrane tester, using an NTF membrane (manufactured by Nitto Electric Industry Co., Ltd., pore size 0.2 μm) flat membrane (effective membrane area 13.85 cm ² ). The permeation performance was examined by a pass-through method. Liquid temperature is 20 ℃, fill liquid sample 400ml,
The experiment was conducted at an operating pressure of 0.5 kg / cm ² . Only a small amount of permeate was obtained at the beginning of passage, and no permeate was obtained immediately after the start of operation.

The permeation performance of the exposed liquid discharged at pH = 5.0, liquid temperature of 40 ° C. and Brixl.4 [%] was examined using a flat membrane tester using the same flat membrane as above.

Results of 400ml of filling liquid sample and operating pressure of 0.4kg / cm ²
About 40 ml of permeate was obtained per minute, but no permeate could be obtained thereafter.

[Effect]

As is clear from the operation results in each of the above-mentioned examples, according to the present invention, the fish meat water extract was subjected to a temperature of 35 to 80 ° C and a pH of 4.0 to 6.0.
The permeation flow is extremely higher than that in the case of ultra-precision by cross-flow precision under the above conditions, in the case of precision precision of other types, or in the case of cross-flow precision precision under the conditions outside the above range. Bundles are obtained in a stable manner and can be overprocessed extremely efficiently.

Thus, the present invention can provide an extremely effective method for treating a fish meat water extract by a membrane utilization technique.

[Brief description of drawings]

FIG. 1 is a graph showing the change of permeation flux with the passage of time in a precision crossover of the cross-flow method performed in Example 1, and FIG. 2 shows the change of permeation flux with the passage of time in the case of ultrapassage made in Example 1. It is a graph shown.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Kouji Takahashi 1-4-9 Kawagishi, Toda City, Saitama Organo Research Institute (72) Inventor Keisuke Nakagome 1-1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Nitto Electric Industry Co., Ltd. (72) Inventor Toshio Yabushita 1-1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Nitto Electric Industry Co., Ltd. (72) Inventor Kyohei Toyota 559-6 Kitano-cho, Hachioji-shi, Tokyo Nippon Fisheries Co., Ltd. Central Research Laboratory (72) Inventor Hiroshi Sasaki 559-6 Kitano-cho, Hachioji-shi, Tokyo Japan Fisheries Co., Ltd. Central Research Laboratory (56) Reference JP-A-60-143890 (JP, A)

Claims (1)

[Claims] 1. A fish meat water extract containing a liquid temperature of 35 to 80 ° C. and a pH of 4.0 to 6.0.
A method of treating a fish meat water extract, which is characterized by performing a precision overtreatment by a cross-flow method under the conditions of.