JP2592399B2 - Treatment method of liquor distillation waste liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a waste liquid, and more particularly to a method for treating a waste liquid containing a high concentration of organic matter.
It is characterized by treating food factory wastewater such as distillation wastewater with poor filtration with vegetable fiber or a mixture containing it as a main component and yeast to aggregate solids in the wastewater and collect and remove this. The present invention relates to a method for treating waste liquid.

[0002]

2. Description of the Related Art Shochu distillation liquor made from wheat, rice, buckwheat or the like contains a high concentration of solids and has a high viscosity, which makes solid-liquid separation extremely difficult. Even when a commonly used cationic chemical flocculant such as polyaluminum chloride or ferric chloride is used in combination with an anionic chemical flocculant, no flocculation to the extent of facilitating solid-liquid separation is observed. . For this reason, it is in a state where it is not possible to proceed to the purification treatment using microorganisms which is widely performed. Therefore, their treatment has relied on methods such as ocean dumping, soil reduction, and mixing with livestock feed.

However, since these waste liquids contain about 90% of water, there are problems such as contamination of groundwater in soil reduction and too much water as feed, so that there is a limit as a treatment method. It is difficult to predict that we can continue from the viewpoint of global environmental protection.

[0004]

In order to purify a solution containing solid matter together with high-concentration organic matter such as alcoholic liquor waste liquid, first, the removal of solid matter is an essential pretreatment step. No practical method has been developed for this pretreatment. Then, the present inventors made it a subject to develop the method which can coagulate the solid content contained in distillation waste liquid etc. quickly and can perform solid-liquid separation easily.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and as a result of intensive studies from various fields, it has been found that the technique for removing solids has a high solids content. When a treatment contrary to the common technical knowledge of adding a solid content called plant fiber to the distillation waste liquid was further performed, and a microorganism treatment with Trichosporon was further used in combination,
Quite unexpectedly, a new and extremely useful finding was obtained that the solids separation of highly concentrated effluents is very efficient.

The present invention has been made on the basis of such new findings, and its basic technical idea is to use Trichosporon spp. Together with a plant fiber or a mixture containing a plant fiber as a main component, and a food containing solids. The point is that the solid content is added to the wastewater to quickly aggregate the solid content, and the solid content is easily separated and removed. Hereinafter, the present invention will be described in detail.

In the present invention, yeast belonging to the genus Trichosporon is widely used. For example, Trichosporon sp. M111 strain (Trichosporon sp. M) isolated and obtained from nature by the present inventors.
111) (FERM P-11960) can be used to advantage. This fungus forms a mycelium and spores but proliferates by division and budding, but does not form ascospores. Thus, the fungus was identified as a Trichosporon yeast, which is an incomplete fungus. In this bacterium, the fermentability of glucose was recognized although it was weak, and fruit-like aroma was felt from the medium. This bacterium grew to pH 3-9 and 35 ° C., and the optimum pH and temperature were 5 and 28 ° C., respectively. In addition, urease,
Both the DBB and DNase tests were negative.

The yeast belonging to the genus Trichosporon can use not only isolated cells and spores, but also all yeast-containing materials such as wet cakes, culture solutions, cultures, concentrated or pasted products, and dilute products. It is also possible to return and use at least part of the yeast-containing material obtained after the treatment.

In the present invention, it is necessary to add plant fibers and / or their contents to the waste liquid to be treated in the treatment of microorganisms. The amount of addition varies depending on the type of plant fiber used, the type of waste liquid to be treated, and the like, but at least about 0.1% of dry solid content relative to the amount of waste liquid is required. Preferably 0.1 to 30%, more preferably 0.5
About 20%.

[0010] As the plant fiber, KC-Floc W-5
0 (products of Takeda Pharmaceutical Co., Ltd.); okara, bagasse, beet lees, brassica, bran, threshing lees, starch production lees, and other agricultural production lees; citric acid and other organic acid fermented lees, soy sauce lees, Fermented lees such as alcohol-produced lees; wood or fruit pulp; drainage sludge from this plant, and the like.

[0011] The above-mentioned plant fiber (the content thereof) is added to the distillation waste liquid, mixed, and inoculated with Trichosporon spp. (The culture, the content and / or the processed product thereof) and incubated. Solid matter aggregates immediately after addition,
Settles.

[0012] The liquid portion separated by solid-liquid separation in this way is discharged to a river or the like as it is when the degree of contamination is low. The treatment may be carried out using various microorganisms, physical treatment, chemical treatment or a combination thereof, and the treatment is carried out very efficiently.

On the other hand, the solid part separated from the liquid can be effectively used as feed, fertilizer, soil improving material, artificial soil, etc. as it is, or after dehydration to form a paste, or further drying. If necessary, it can be reused in the present invention as a plant fiber. If desired, it can be incinerated or returned to the soil. Since the solid portion has no problem in safety, there is no possibility of causing secondary pollution even if this treatment is performed.

Hereinafter, embodiments of the present invention will be described.

[0015]

Example 1 Distilled waste liquid of wheat shochu and buckwheat shochu was 7 each
5 ml of the plant fiber and the bacterial cell suspension were added in this order, and the improvement of filterability for solid-liquid separation was evaluated. 1.0 g of KC-Floc W-50 (a product of Takeda Pharmaceutical Co., Ltd.) was added as a vegetable fiber, and after stirring, Trichospor was added.
on sp. M111 (FERM P-11960)
A cell suspension (hereinafter abbreviated as M111) was added to a final concentration of 3 × 10 ⁷ cells / ml, and the total amount was 1 × 10 ⁷ cells / ml.
00 ml.

(Filtration conditions) A stainless steel net (330 mesh, 45 μm) is spread on the bottom of a Kiriyama funnel S-60 (product of Kiriyama Seisakusho) (diameter 6 cm), and the coagulated waste liquid is poured thereon, and suction is performed at 500 mmHg. Filtered. The test was performed at room temperature (20 ° C.), and the filtrate obtained during a predetermined time was measured, and the results are shown in FIGS. 1 and 2.

[0017]

Example 2 A predetermined amount of citric acid fermented lees (a mixture of tapioca and sweet sho starch cultivated with citric acid-producing bacteria to produce citric acid in 100 g of barley shochu distillation effluent, and the residue obtained after extraction and recovery) , Containing about 80% of water) and 10 ml of 5 × 10 ⁸ cells / ml M111 bacterial cell solution, and the improvement of filterability was evaluated in the same manner as in Example 1. The test was performed at room temperature, and the results are shown in FIG.

[0018]

Example 3 For the purpose of investigating the effect of temperature in the treatment of adding citric acid fermented cake, 100 g of a distilled liquor of barley shochu at a predetermined temperature was used.
10g of citric acid lees and 5 × 10 ⁸ cells / ml of M
10 ml of the 111-cell solution was added, and the improvement of the filterability was evaluated in the same manner as in Example 1. The results are shown in FIG.

[0019]

[Example 4] 1% of the wastewater from a paper mill was added to 75 ml of a barley shochu distillation waste liquid, and 3 × 10 ⁸ cells / m 3 were added.
1 ml of the M111 bacterial cell solution was added, and if necessary, water was added to make the total amount 100 ml, and the improvement of the filterability was evaluated in the same manner as in Example 1. The test was performed at room temperature and the results are shown in FIG.

[0020]

Example 5 Soy sauce cake (moisture 2
5%) and dried okara were added so that the dry weight was 1%, and 10 ml of a 3 × 10 ⁸ cells / ml M111 cell solution was added, and if necessary, water was added to make a total amount of 10%.
With the volume set to 0 ml, the improvement of the filterability was evaluated in the same manner as in Example 1. The test was performed at room temperature and the results are shown in FIG.

[0021]

Example 6 A predetermined amount of citric acid fermented lees (used in Example 2) was added to 75 ml of rice shochu distillation waste liquid and 5 × 10 ⁸ cells.
10 ml of the ls / ml M111 bacterial cell solution was added, and if necessary, water was added to make the total amount 100 ml, and evaluation of improvement in filterability was performed in the same manner as in Example 1. The test was performed at room temperature and the results are shown in FIG.

[0022]

Example 7 A dehydration test of barley shochu distillation waste liquid was performed using a twin-cross type dehydrator (shown in FIG. 8). The concentration of the waste bacterium after addition of the culture solution of the M111 strain was 2 × 10 ⁷ cells / m 2.
l, feed amount to the dehydrator 500 liter / hr,
The treatment was performed under the conditions of a filter cloth traveling speed of 1.0 m / min and a cloth width of 50 cm.

The distillation waste liquid, the M111 strain, and the plant fibers shown in Table 1 below were mixed and stirred by a mixing rotary drum, and passed through an upper filter cloth and a lower filter cloth under the above conditions to separate the filtrate. The solid content after separating the filtrate was recovered from the dehydrator as a dehydrated cake. The results obtained are shown in Table 1 below.

[0024]

[Table 1]

[0025]

According to the present invention, by adopting a completely novel structure in which plant fiber treatment and microbial treatment are used in combination, solid-liquid separation is contained due to high solid content and high viscosity. For waste liquids such as distillation waste liquids, which are extremely difficult to treat because they are very difficult, solid-liquid separation has not only been made possible but also made possible in a very short time.

As a result, waste liquid having high concentration of solids and high viscosity, such as waste liquid of shochu distilled from various sources such as wheat, rice and buckwheat, and waste liquid of alcohol such as alcohol production waste liquid can be efficiently removed in a very short time. The solid-liquid separation can be performed in a short time, and the waste liquid treatment, which conventionally required a long time, can be performed in a short time.

[Brief description of the drawings]

FIG. 1 shows a flocculation treatment of barley shochu waste liquid by M111 bacteria.

FIG. 2 shows coagulation treatment of buckwheat shochu waste liquid by M111 bacteria.

FIG. 3 shows the coagulation treatment (addition amount) of barley shochu waste liquid by using citric acid fermented cake.

FIG. 4 shows a (temperature) flocculation treatment also using citric acid fermented cake.

FIG. 5 shows coagulation treatment of barley shochu waste liquid by using dewatered sludge of a paper mill.

FIG. 6 shows a coagulation treatment using a food industry by-product.

FIG. 7 shows the flocculation treatment of rice shochu waste liquid by using citric acid fermented cake.

FIG. 8 shows a waste liquid solid-liquid separation and dehydration system using a twin-cross type dehydrator.

 ──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 391011700 2-10-1 Tachibana-dori Higashi, Miyazaki City, Miyazaki Prefecture, Miyazaki Prefecture (72) Inventor Takayuki Obata 2-6-30 Takinogawa, Kita-ku, Tokyo National Tax Agency Brewing Test In-house (72) Inventor Osamu Akita 2-6-30 Takinogawa, Kita-ku, Tokyo National Tax Agency brewing laboratory (72) Inventor Haruyuki Ito 2-6-30 Takinogawa, Kita-ku, Tokyo National Tax Agency brewing laboratory (72 Inventor Jin Shimoi 2-6-30 Takinogawa, Kita-ku, Tokyo National Tax Agency Brewing Laboratory (72) Inventor Yoshitomo Nagamori 3239-4 Ogata, Oita-shi, Oita Pref. Oita Industrial Testing Laboratory (72) Inventor Hida 3239-4 Oita, Oita, Oita, Oita Pref.Industrial Research Laboratory (72) Inventor Shinji Setoguchi 145-1 Oda, Hayato-cho, Aira-gun, Kagoshima Pref. Kagoshima Prefectural Industrial Technology Center (72) Akita Kazunori Takamine 1445-1 Oda, Hayato-cho, Aira-gun, Kagoshima Prefecture Kagoshima Prefectural Industrial Technology Center Tetsuzo Kudo 1-7-14 Tsunehisa Tsunehisa, Miyazaki City, Miyazaki Prefecture Inside the Food Processing Research and Development Center, Miyazaki Prefecture (56) References JP-A-4-271776 (JP, A)

Claims (5)

(57) [Claims] 1. The method according to claim 1, wherein the liquor distillation waste liquid further comprises vegetable fiber and / or
Alternatively, a method for treating a liquor distillation waste liquid, comprising adding 0.1 to 30% of the content thereof and treating with a Trichosporon yeast. 2. The yeast of the genus Trichosporon is Trichosporone species M111 (FERM P-1196).
The method of claim 1, wherein 0). 3. The method according to claim 1, wherein the liquor distillation waste liquid is a shochu distillation waste liquid and / or an alcohol distillation waste liquid using wheat, rice, buckwheat or the like as a raw material. 4. The plant fiber according to claim 1, wherein the plant fiber is a plant fiber product, an agricultural production lees, a fermented lees, wood or fruit pulp, and / or a wastewater sludge from a plant of the plant. The method according to claim 3. 5. A liquor distillation waste liquid, wherein the liquid part is further subjected to a microorganism treatment, a physical treatment and / or a chemical treatment after solid-liquid separation by the method according to any one of claims 1 to 4. Processing method.