JP2008126156A - Filtration method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filtration method which enables a suppression in energy consumption and a reduction in the production cost for edible noodle. <P>SOLUTION: The filtration method involves dynamic filtration of boiling water generated in the step of boiling produced noodle or washing wastewater generated in the step of washing noodle in edible noodle production process comprising the step of boiling the noodle and the successive step of washing the noodle and thereafter further involves ultrafiltration. The treated water can be used again as hot water for boiling noodle or washing water. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a filtration method that enables reuse of juice and washing wastewater from boiled noodles.

Dry noodles and raw noodles are known as commercially available noodles. Among these, raw noodles are manufactured by boiling the noodles with boiling water (about 100 ° C.) and then washing with cold water (about 1 ° C.).
Thus, in the process of producing raw noodles, a large amount of clean water is required, and tap water and groundwater are generally used. And the washing | cleaning waste_water | drain after washing | cleaning with a boil is drained as it is, or after removing a large foreign material with a rough mesh etc., it is drained.
It is conceivable to use separation membranes frequently used as wastewater treatment means for the treatment of washing wastewater such as vegetables. Non-patent document 1 describes a technique for UF treatment of boiled noodle washing water (pot rinse water). ing.
MRC News, No. 16, issued on January 31, 1996, edited and published by Food Film Technology Council, p56-59

Non-Patent Document 1 discloses a technique for UF processing of boiled noodles, but it is not a practical method and has not been put into practical use. For this reason, conventionally, boiled noodle soup and washing water are drained as they are, which is a factor of increasing the load on the wastewater treatment plant.
In addition, tap water or ground water is used for boiling or washing noodles. However, when the water temperature is 20 ° C., it is necessary to heat from 20 ° C. to 100 ° C. when boiled, and from 20 ° C. to 1 for washing. It is necessary to cool to 0 ° C. For this reason, there are many wastes of water resources and energy.

  It is an object of the present invention to provide a filtration method for filtering soup and washing waste water in a noodle bowl so that the noodle bowl can be reused as hot water or washing water.

The present invention, as a means for solving the problem, is a method for filtering wastewater produced in the process of producing edible noodles, which includes a step of boiling noodles made and then a step of washing with cold water,
Provided is a filtration method for performing ultrafiltration treatment after dynamic filtration treatment of boiled juice produced in the process of boiling noodles.

The present invention is a method for filtering wastewater generated in a process for producing edible noodles, which includes a step of boiling the noodles made and then a step of washing with cold water as another means for solving the problems,
Provided is a filtration method of performing ultrafiltration after washing filtration wastewater generated in the step of washing noodles with cold water.

  The treated water obtained by treating with the filtration method of the present invention can be reused as boiled hot water or washing water for noodles.

  The treated water obtained by treating the noodle boiled juice with the filtration method of the present invention is high in temperature, and therefore, when reused as boiled noodle boiled water, the time and energy consumption required for reheating are suppressed. In addition, since the treated water obtained by treating the washing wastewater for noodles with the filtration method of the present invention is low temperature, the time and energy consumption required for recooling are suppressed when reused as the washing water for noodles. The For this reason, the production cost can be greatly reduced by adding the filtration treatment process of the present invention to the production process of edible noodles.

(1) Boiled soup filtration method and boiled water reuse method <Dynamic filtration process>
Boiled juice is first dynamically filtered. At this time, if a piece of noodle is mixed in the boiled juice, it is preferably removed using a piece of wire mesh.

  The dynamic filtration method is not particularly limited, and a known method using a bag-like filtration element or the like as a filtration means (for example, JP 2003-103289 A JP 2003-225506 A, JP 2003-225519 A). Applicable.

Filtration pressure difference is preferably 20kPa or less, more preferably 0.1~10kPa (= water head difference of 1 to 100 cm), the flow rate is preferably 5~50m ³ / ^m 2 / 24hr, more preferably 10 to 30 m ³ / ^m in the range of 2/24 hr or, it is preferably filtered by a constant flow rate.

<Ultrafiltration process>
After the dynamic filtration, the primary treated water is filtered through an ultrafiltration membrane (an ultrafiltration membrane module in which the filtration membrane is accommodated in a module case).

  The ultrafiltration membrane may be made of a hydrophilic material, may be made of a hydrophobic material, or may be a composite membrane of these.

  Examples of the hydrophilic material include cellulose materials such as cellulose acetate, cellulose propionate, cellulose butyrate, regenerated cellulose, and a mixture thereof. Moreover, polyvinyl alcohol etc. can also be used.

  Examples of the hydrophobic material include a polysulfone resin, a polyether sulfone resin, a polyvinylidene fluoride resin, a polyacrylonitrile resin, a polyimide resin, a polyaramid resin, a polypropylene resin, and a polyethylene resin.

  The ultrafiltration membrane is preferably a hollow fiber membrane made of a polyether sulfone resin and cellulose acetate, and particularly preferably an internal pressure type hollow fiber membrane.

  When a hollow fiber membrane is used as the ultrafiltration membrane, for example, an inner diameter of 0.3 to 3.0 mm (preferably 0.5 to 1.0 mm), an outer diameter of 0.4 to 5.0 mm (preferably 0.7). And a molecular weight cutoff of 3,000 or more (preferably 100,000 or more) can be used.

  The hollow fiber membrane can be used as one bundle or two or more bundles of hollow fiber membranes in which a necessary number is bundled according to the amount of treated water and the concentration of turbid components in the treated water.

  The filtration operation conditions (water permeability rate, etc.) can be appropriately set according to the amount of treated water and the concentration of turbid components in the treated water. For example, the water permeability rate is 0.5 to 5.0 m / day, 10 A method of repeating this by setting the operation of carrying out the filtration operation for ˜1500 minutes and then performing the reverse pressure washing for 0.5 to 5 minutes as one cycle can be applied. You may add chemical | medical solutions, such as a well-known alkali and sodium hypochlorite, to backwashing water. Further, instead of back pressure cleaning, only filtration during operation may be stopped, and flush cleaning in which only the raw water side is passed may be performed, or flash cleaning and back pressure cleaning may be combined.

  The final treated water after ultrafiltration may be drained as it is, or may be reused as boiling water for noodles after adding tap water as necessary. Since the final treated water is still in the state of hot water (several tens of degrees Celsius), when reusing as hot water in the noodle bowl, the energy for heating up to 100 ° C is higher than that for heating tap water. It is greatly reduced.

  Thus, by repeating the cycle of filtering the boiled juice and reusing it as boiled hot water, consumption of water resources and energy can be suppressed, and the manufacturing cost can be reduced.

(2) Washing drainage filtration method and reuse method as washing water Washing drainage filtration treatment is performed in a dynamic filtration step and an ultrafiltration step in the same manner as boiled juice filtration treatment. The washing water for boiled noodles is about 1 ° C, and the washing drainage after washing the boiled noodles is about 10 ° C.

  The final treated water after the ultrafiltration may be drained as it is, or may be reused as boiled noodle washing water after adding tap water as necessary. Since the final treated water is in a low temperature state (about 10 ° C), when it is reused as boiled noodle washing water, the energy for cooling to 1 ° C is greatly reduced compared to cooling tap water. Is done.

  Thus, by repeating the cycle of filtering the boiled noodle washing wastewater and reusing it as boiled noodle washing water, consumption of water resources and energy can be suppressed, and the production cost can be reduced.

Reference example 1
To 2 L of tap water, 300 g of noodles (Sanuki udon, raw noodles, manufactured by Hinode Seisakusho) was added and kept for 15 minutes after boiling. Thereafter, boiled noodles and boiled juice (about 1.5 L; 90 ° C.) were separated. The BOD of boiled juice was 2400 mg / L and the turbidity was 690 NTU.

  Next, 300 g of boiled noodles (wet mass) is put in a container, immersed in room temperature tap water and cooled to room temperature, and then 1.5 L of cold water (about 1 ° C.) is added thereto, and gently for 5 minutes. Stir. Thereafter, noodles and washing waste water (about 1.5 L; 7 ° C.) were separated. The BOD of the washing waste water was 26 mg / L and the turbidity was 6 NTU.

Example 1
The boiled juice produced in Reference Example 1 was subjected to two stages of filtration, dynamic filtration and ultrafiltration.

(Dynamic filtration)
With a metal mesh (400 mesh; JIS) having a membrane area of 0.01 m ² , 1.5 L of boiled juice is filtered in about 6 minutes (filter head difference is about 10 cm), and 1.0 L of raw water for ultrafiltration is obtained. Separated into 0.5 L of concentrate. The average permeation flow rate at this time was about 24 m / d.

(Ultrafiltration)
1.0 L of raw water for ultrafiltration was subjected to cross flow filtration with a hollow fiber membrane module, and separated into 0.6 L of ultrafiltrated water and 0.4 L of concentrated water. The temperature of the final treated water after the ultrafiltration treatment was about 50 ° C. The BOD of ultrafiltrated water was 950 mg / L, and the turbidity was 0.5 NTU.

The hollow fiber membrane module consists of 20 hollow fiber membranes (manufactured by polyethersulfone, molecular weight cut off 150,000, FUS1582; manufactured by Daisen Membrane System Co., Ltd.), polycarbonate having an outer diameter of 26 mm, an inner diameter of 20 mm, and a length of 30 cm. What was stored in the case made and sealed at both ends with an epoxy resin (effective membrane area 0.013 m ² ) was used. The filtration pressure was 40 kPa, and the average permeation flux was 0.4 m / d.

  When the final treated water obtained in this way is used again as boiling water for noodles, it is only necessary to heat from 50 ° C. to 100 ° C. Therefore, compared with the case of using tap water, the energy required for heating can be saved. .

Example 2
The washing wastewater produced in Reference Example 1 was subjected to two stages of filtration treatment, dynamic filtration and ultrafiltration.

(Dynamic filtration)
With a metal mesh (400 mesh; JIS) having a membrane area of 0.01 m ² , 1.5 L of washed waste water is filtered in about 5 minutes (filter head difference is about 10 cm), and 1.0 L of raw water for ultrafiltration is obtained. Separated into 0.5 L of concentrate. The average permeation flow rate at this time was about 29 m / d.

(Ultrafiltration)
1.0 L of raw water for ultrafiltration was subjected to cross flow filtration with a hollow fiber membrane module, and separated into 0.7 L of ultrafiltrated water and 0.3 L of concentrated water. The temperature of the final treated water after the ultrafiltration treatment was about 12 ° C. The BOD of ultrafiltered water was 11 mg / L, and the turbidity was 0.4 NTU.

The hollow fiber membrane module consists of 20 hollow fiber membranes (manufactured from cellulose acetate, molecular weight cut off 150,000, FUC1582; manufactured by Daisen Membrane System Co., Ltd.), a transparent polychlorination having an outer diameter of 26 mm, an inner diameter of 20 mm, and a length of 30 cm. What was accommodated in the case made from vinyl, and sealed both ends with the urethane resin (effective membrane area 0.013m < ² >) was used. The filtration pressure was 30 kPa, and the average permeation flux was 0.9 m / d. Note that the raw water for ultrafiltration was stored in a refrigerator in order to prevent the temperature from rising before ultrafiltration, and a necessary amount was taken out and ultrafiltered.

When the final treated water thus obtained is used again as boiled noodle washing water, it is only necessary to cool from 12 ° C. to 1 ° C., thus saving energy required for cooling compared to using tap water. it can.

Claims (4)

A process for filtering wastewater produced in a process for producing edible noodles, comprising a step of boiling noodles made and then a step of washing with cold water,
A filtration treatment method in which, after the boiled juice produced in the process of boiling noodles is subjected to dynamic filtration, ultrafiltration is further performed.   The filtration treatment method according to claim 1, wherein the treated water subjected to the ultrafiltration treatment is heated and reused as boiling water for noodles. A process for filtering wastewater produced in a process for producing edible noodles, comprising a step of boiling noodles made and then a step of washing with cold water,
A filtration treatment method in which the washing waste water generated in the step of washing noodles with cold water is subjected to a dynamic filtration treatment and then subjected to an ultrafiltration treatment. The filtration treatment method according to claim 3, wherein the treated water subjected to the ultrafiltration treatment is cooled and reused as washing water for noodles.