JP2021104009A - Lactobacillus parafarraginis strain gbw-hb1903 and use of the same - Google Patents

Abstract

To provide a bacterial strain that can decompose nitrate nitrogen highly efficiently.SOLUTION: Lactobacillus parafarraginis GBW-HB1903 named as Lactobacillus parafarraginis and having an accession number CGMCC No.18391 can be used for decomposing nitrate nitrogen in sewage. In an aerobic environment, removal ratio of nitrate nitrogen of the Lactobacillus parafarraginis GBW-HB1903 may be higher than 85%.SELECTED DRAWING: Figure 1

Description

The present invention relates to the field of microbial technology, particularly to Lactobacillus parafalaginis GBW-HB1903 and its applications.

As socio-economics and living standards continue to improve, socio-economic and industrial wastewater generations are increasing, increasing the amount of sewage treatment in each region, while putting a huge burden on the sewage treatment sector. Massive sewage drainage has a major impact on the ecological environment and health, eutrophication of large amounts of rivers, lakes and inshore waters, explosive growth of algae, and damage to the health and ecological balance of underwater flora and fauna. I'm coming. In addition to COD, which is abundant in the components that cause deterioration of water quality in sewage, nitrogen element is also one of the main causes. The nitrogen-containing organic matter in the sewage treatment system first becomes ammoniacal nitrogen by the action of the dependent nutrient bacteria on ammonia, and then the ammoniacal nitrogen is converted to nitrite and nitrate by the nitrification action of the nitrifying bacteria in the aerobic pond. Although it is required to achieve the standard value of ammoniacal nitrogen during sewage treatment, the total nitrogen is very high because the nitrogen in the water will eventually exist mainly in the state of nitrified nitrogen. .. Many developing countries are aware of this problem and strictly regulate the index of total nitrogen in the sewage treatment discharge conditions, whereas in Japan, ammonia is still used in the wastewater emission standards of many industries. Only the emission limit value of sex nitrogen is specified, and the emission limit value of total nitrogen is not specified.

However, as Japan's environmental conservation policy complementation and supervision and management department management are constantly being strengthened, Japan has begun to carry out strict supervision and management of the total nitrogen index during wastewater discharge from 2018. Therefore, in order to achieve the standard value of total nitrogen emission index in wastewater, how to improve the efficiency of removing nitrate nitrogen in water within a short time is an issue that must be solved suddenly. There is. However, the biochemical treatment process for sewage and wastewater is already an important component of the majority of sewage treatment systems, which is easy to operate, low in investment and highly efficient. However, there are not so many microorganisms in the system that can utilize nitrate nitrogen with extremely high efficiency, and it is quite difficult to remove the total nitrogen in the wastewater within a short time to reach the standard value, but the wastewater system. Adding a microbial agent capable of decomposing nitrate nitrogen with high efficiency has become an important method and measure to solve this difficult problem.

Therefore, by searching for a strain that can decompose nitrate nitrogen with high efficiency, we will promote the improvement of the total nitrogen removal rate in wastewater, achieve it based on the total nitrogen in wastewater, and stabilize the impact resistance and operation of the sewage system. It is possible to further improve the sex and has important significance.

The present invention has the ability to efficiently remove nitrate nitrogen in wastewater, is environmentally friendly, and grows rapidly, in order to overcome the problems and drawbacks existing in the above-mentioned existing technology. It is an object of the present invention to provide Parafaraginis GBW-HB1903 and its applications.

In order to solve the above problems, the present invention has been named Lactobacillus parafarraginis, and the deposit number CGMCC No. Provided is Lactobacillus parafalaginis GBW-HB1903, which is 18391.

In addition, the colonies of Lactobacillus parafalaginis GBW-HB1903 are round, milky white, 1-2 μm in diameter, with a smooth, moist, glossy surface, slightly protruding in the middle, opaque, and clear edges. , There is no halo ring.

Furthermore, the Lactobacillus parafalaginis GBW-HB1903 is a facultative anaerobic bacterium and has a growth oxygen dissolution concentration of 0.2 to 3 mg / L.

Further, the optimum growth oxygen dissolution concentration of the Lactobacillus parafalaginis GBW-HB1903 is 2 to 3 mg / L.

Further, the suitable growth temperature of the Lactobacillus parafalaginis GBW-HB1903 is 10 to 45 ° C, and the optimum growth temperature is 25 to 35 ° C.

Further, the suitable growth pH of the Lactobacillus parafalaginis GBW-HB1903 is 6-9, and the optimum pH is 6.5-7.5.

In addition, suitable growth media for the Lactobacillus parafalaginis GBW-HB1903 include molasses and cornstarch.

Further, the Lactobacillus parafalaginis GBW-HB1903 enters the logarithmic growth period after culturing, and reaches the end of growth after 16 to 18 hours, and the number of bacteria becomes 5.0 × 109 cfu / mL.

The present invention provides an application in the production of a microbial fungus agent used for decomposing nitrate nitrogen in sewage of the Lactobacillus parafalaginis GBW-HB1903.

Further, the Lactobacillus parafalaginis GBW-HB1903 obtains a Lactobacillus parafalaginis solution by fermentation and culturing, and the fermentation conditions are a container pressure of 0.1 to 0.2 MPa, a temperature of 28 to 32 ° C., and an oxygen solubility ≧. The 30% stirring speed is 150 to 180 rpm and the fermentation time is 20 to 22 h.

Further, the amount of the fermented bacterial solution added to Lactobacillus parafalaginis is 0.1 to 0.5 ‰ of the volume of the sewage pond.

Furthermore, in an aerobic environment, the removal rate of nitrate nitrogen of Lactobacillus parafalaginis GBW-HB1903 is higher than 85%, and in an oxygen-deficient environment, the removal rate of nitrate nitrogen of Lactobacillus parafalaginis GBW-HB1903 is 85. %taller than.

The lactobacillus parafaraginis GBW-HB1903 of the present invention belongs to a facultative anaerobic bacterium and can grow in an environment having an oxygen dissolution concentration of less than 0.5 mg / L or 1.0 mg / L or more, and the optimum oxygen for its growth. Since the dissolved concentration is 2-3 mg / L, this bacterium can grow well in an aerobic environment or under oxygen-deficient conditions, has a highly efficient ability to remove nitrate nitrogen in sewage, and is aerobic or oxygen. The nitrate nitrogen decomposition rates in the deficient sewage are 85% and 80% or more, respectively. The Lactobacillus parafaraginis GBW-HB1903 of the present invention can be applied not only to the total nitrogen removal in the aerobic partition of the sewage treatment system, but also to the total nitrogen removal in the oxygen deficiency partition of the sewage treatment system, and further to the total nitrogen of the system. This bacterium has a wide range of potential applications because it can improve treatment and impact resistance and ensure stable operation of sewage treatment systems.

Is a diagram showing the colony morphological characteristics on the MRS plate of the Lactobacillus parafalaginis GBW-HB1903. Is a growth graph of the Lactobacillus parafaraginis GBW-HB1903.

Hereinafter, the technical means of the present invention will be described in more detail with reference to specific embodiments.
In the following embodiments, unless otherwise specified, all experimental methods used are conventional methods, and all materials, reagents, etc. used can be purchased from bio- or chemical reagent manufacturers.

Medium recipe required during the embodiment:
1. 1. Concentrated screening broth nitrate nitrogen degrading bacteria: Glucose _{5g, NaNO 3 1g, Na 2} CO 3 1g, K 2 HPO 4 0.5g, MgSO 4 · 7H 2 O 0.03g, FeSO 4 · 7H 2 O 0. 4 g, NaCl 5 g, pH 6.0-7.0, distilled water 1 L.
2. Separating purified solid medium of nitrate nitrogen degrading bacteria: Glucose _{5g, NaNO 3 1g, Na 2} CO 3 1g, K 2 HPO 4 0.5g, MgSO 4 · 7H 2 O 0.03g, FeSO 4 · 7H 2 O 0. 4 g, NaCl 5 g, agar powder 15 g, pH 6.0-7.0, distilled water 1 L.
3. 3. Improved nutrient broth (NB) medium: Beef extract 5g, peptone 10 g, sodium chloride _{5g, (NH 4) 2 SO} 4 2g / L, FeSO 4 · 7H 2 O 0.03g / L, MgSO 4 · 7H 2 O 0. 05 g / L, 1 L of water, pH 7.2-7.5.
4, improved nutrient broth (NB) solid medium: Beef extract 5g, peptone 10 g, sodium chloride _{5g, (NH 4) 2 SO} 4 2g / L, FeSO 4 · 7H 2 O 0.03g / L, MgSO 4 · 7H 2 O 0.05 g / L, agar powder 15 g, water 1 L, pH 7.2-7.5.
5. MRS solid medium: Peptone 10.0 g / L, beef extract powder 5.0 g / L, yeast extract powder 4.0 g / L, glucose 20.0 g / L, dipotassium hydrogen phosphate 2.0 g / L, Kuen Dipotassium phosphate 2.0 g / L, sodium acetate 5.0 g / L, magnesium sulfate 0.2 g / L, manganese sulfate 0.05 g / L, agar 15.0 g / L, yeast 80 1.0 g / L, pH value 6.2 ± 0.2 (25 ° C).
6. Fermentation medium: glucose 100 g / L, corn starch _{20g / L, NaCl 5g / L} , (NH 4) 2 SO 4 2g / L, KH 2 PO 4 0.15g / L, FeSO 4 · 7H 2 O 0.03g / L _{, Na 2 HPO 4 4g / L} , MgSO 4 · 7H 2 O 0.05g / L, other than water, pH of the liquid medium between 6.5 and 7.5.
Before use, all of the above media are sterilized at 121 ° C. for 20 minutes and then stored at room temperature.

<Example 1>
Sorting, isolation and appraisal of Lactobacillus parafalaginis GBW-HB1903 1. Selection and purification of Lactobacillus parafalaginis GBW-HB1903 bacterial species 2 mL each from municipal sewage, industrial sewage and garbage exudate, etc. Place in PBS buffer, shake for 5 min, mix well the sample, centrifuge at 1000 rpm for 5 min, collect sample supernatant and prepare for use. Then, take 10 mL of the above sample supernatant, put it in an Erlenmeyer flask containing 200 mL of concentrated selection medium for nitrate nitrogen-degrading bacteria, incubate for 2d on a shaking table at 30 ° C. and 150 rpm, and concentrate 3 times. do. Further, the cultured bacterial suspension is gradient-diluted, and then 10 μL is taken and applied on a separated and purified solid medium of nitrate nitrogen, and placed in an incubator at 30 ° C. for culturing. After 48 hours, colonies are selected into different morphologies, line-cultured on MRS solid medium, and separation and purification are repeated 3 times to finally obtain a single colony. This single colony is named GBW-HB1903. ..
As shown in FIG. 1, the colonies of the strain GBW-HB1903 on the MRS plate are round, milky white, 1-2 μm in diameter, the surface is smooth and moist, glossy, the middle is slightly protruding, opaque, and the sides. The edges are clear and there is no halo ring.

2. Identification of Lactobacillus parafaraginis GBW-HB1903 Using the DNA of the strain GBW-HB1903 as a model, amplification was performed using a 16S rRNA universal primer, and the sequence for the amplified fragment was measured to measure the 16S rDNA of the strain GBW-HB1903. Sequencing results were obtained, but as a result of comparative analysis with the sequence in GenBank, the strain GBW-HB1903 had the highest homology with Lactobacillus parafaraginis, so this strain GBW-HB1903 was determined to be Lactobacillus parafaraginis.

Deposited strains for the selected strain GBW-HB1903, and deposited the above-mentioned Lactobacillus parafalaginis GBW-HB1903: China Microbial Species Deposit Management Committee Ordinary Microbial Center (CGMCC), Address: Hokushin West Road, Chaoyang District, Beijing No. 1 Hospital No. 3, Agricultural Culture Research Institute, Chinese Academy of Sciences, Deposit date: August 16, 2019, Deposit number of Lactobacillus parafarraginis: CGMCC No. 18391.

<Example 2>
Growth characteristics and physiological / biochemical characteristics of Lactobacillus parafalaginis GBW-HB1903 1. Growth measurement of Lactobacillus parafalaginis GBW-HB1903 Inoculate the psychrophilic Bacillus GBW-HB1903 gradient-cultured into an improved NB medium, and inoculate it in a constant temperature shaking table at pH 6.5-7.5 and 25-35 ° C. After culturing, a GBW-HB1903 bacterial solution is prepared, sampled once every 2 hours, and the absorbance is measured under OD 600 nm to prepare a growth graph. As shown in FIG. 2, according to the experimental results, GBW-HB1903 grows slowly in the previous 4 hours during culturing, but then enters the logarithmic growth period, reaches the end of logarithmic growth after 16 to 18 hours, and the number of bacteria is 5.0. It becomes × 109 cfu / mL, and 18 to 22 h becomes a stable period of growth, and then a period of decline is reached, and thus the whole growth cycle is completed.

2. Physiological and biochemical characteristics of Lactobacillus parafalaginis GBW-HB1903 After further culturing the prepared GBW-HB1903 bacterial solution in NB medium, the strain physiologically and biochemical analysis method of "Burjay Bacterial Classification Handbook" is used. An analysis is performed on the cold Bacillus GBW-HB1903. The results are shown in Table 1. Lactobacillus parafalaginis GBW-HB1903 was able to reproduce normally within the temperature range of 10 to 45 ° C, but the optimum growth temperature was 23 to 35 ° C. All can grow in the pH range of 6-9, the optimum growth pH is 6.5-7.5, and this bacterium can produce urease, β-glucosidase and glycerin, power-nitrate, Simmons. -Can deteriorate or decompose citrate and semi-solid agar. Further, Lactobacillus Parafaraginisu GBW-HB1903 medium suitable for cultivation of molasses 100 g / L, corn starch _{20g / L, NaCl 5g / L} , NaNO 3 2g / L, KH 2 PO 4 0.15g / L, FeSO 4 · 7H _{2 O 0.03g / L, Na 2} HPO 4 4g / L, MgSO 4 · 7H 2 O 0.05g / L, except it is water, pH of the liquid medium is 6.5 to 7.5.

注：＜＋＞は陽性を示し、＜−＞は陰性を示す。

Note: <+> indicates positive and <-> indicates negative.

<Example 3>
Comparative study of growth of strain GBW-HB1903 under different content conditions To test the viability of Lactobacillus parafalaginis GBW-HB1903 under different oxygen content conditions, an analysis of its growth status under different oxygen cancer content conditions is performed. .. Equal amounts of Lactobacillus parafalaginis GBW-HB1903 were inoculated into NB liquid medium under different oxygen content conditions, the pH was adjusted to 6.5-7.5, and the cells were cultured for 20 hours to obtain Lactobacillus parafalaginis GBW-HB1903. Obtain a bacterial solution, but examine the growth status in the medium under different oxygen content conditions. The results are shown in Fig. 2. Lactobacillus parafalaginis GBW-HB1903 can grow normally within an oxygen dissolution concentration of less than 0.5 mg / L or 1.0 mg / L, and the optimum oxygen dissolution concentration is 2-3 mg / L and strain GBW-HB1903 belongs to facultative anaerobes.

<Example 4>
Measurement of total nitrogen (nitrate) removal rate The total nitrogen concentration in water is analyzed using the alkaline potassium persulfate decomposition ultraviolet spectrophotometric method GB11894-89. Simulating the conditions of oxygen deficiency (temperature 30 ° C., pH 7.0, oxygen dissolution concentration ≤ 0.5 mg / L) and aerobic (temperature 30 ° C., pH 7.0, oxygen dissolution concentration ≥ 2 mg / L), lactobacillus. A 48-hour treatment experiment is performed on water containing different initial concentrations of nitrate nitrogen of parapharaginis GBW-HB1903, the removal rate of nitrate nitrogen is calculated, and three repeated experiments are provided for each concentration gradient.

Lactobacillus parafalaginis GBW-HB1903 seed solution was inoculated into the fermentation medium at a 10% volume ratio, the container pressure was adjusted to 0.1 MPa, the temperature was adjusted to 28 to 32 ° C, oxygen solubility ≥ 30%, and the stirring speed was 150 rpm. Lactobacillus parafalaginis GBW-HB1903 fermented bacterial solution is obtained with a fermentation time of 20 hours. Take 120 mL of fermented bacterial solution and centrifuge, then add 30 mL of sterile water to suspend the precipitated mycelium again and mix uniformly, then take 2 mL each of the suspensions. 200 mL of the first five nitrate nitrogen concentrations are placed in different test solutions, followed by a 48 h nitrate nitrogen removal rate test under aerobic and oxygen deficient conditions, respectively.

According to the results in Tables 3 and 4, Lactobacillus parafalaginis GBW-HB1903, which had been treated for 48 hours, simultaneously excellently removed a large number of nitrate nitrogens having different initial concentrations under aerobic and oxygen-deficient conditions. It is effective and its removal rates are 85% and 80% or more, respectively, which means that the purified strain GBW-HB1903 simultaneously has highly efficient nitrate nitrogen decomposition properties under aerobic or oxygen deficient conditions. This strain can be used not only for highly efficient removal of total nitrogen in aerobic compartments of sewage treatment systems, but also for promoting improvement of total nitrogen removal rate in oxygen-deficient compartments of sewage treatment systems. The total nitrogen removal processing capacity can be improved. Due to the special properties of this strain, it has significant application value and significance in terms of removal of total nitrogen in wastewater as a bioenhancing fungal product.

The Lactobacillus parafalaginis GBW-HB1903 of the present invention is easy to use during practical application, and the steps are as follows. Lactobacillus parapharaginis GBW-HB1903 is effective for 20 hours under the conditions of a container pressure of 0.1 MPa, a temperature of 28 to 32 ° C., an oxygen solubility of ≥30%, and a stirring speed of 150 rpm to obtain a fermented bacterial solution, and then directly aerobic or oxygen. Sewage biochemical treatment anaerobic or oxygen-deficient pond volume of 0.1 to 0.5 ‰ of fermented bacterial solution may be added to the water supply port of the depleted pond.

The above-described embodiment is for explaining the best technical means of the present invention, and is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, ordinary engineers in the art can still modify the technical means described in the above-described embodiments or equivalently replace some of the technical features thereof. , These modifications or equivalent substitutions are not admitted that the essence of the corresponding technical means departs from the spirit and scope of the technical means protected by the present invention.

Claims (10)

Named Lactobacillus parafarraginis, deposit number CGMCC No. Lactobacillus parafalaginis GBW-HB1903, characterized in that it is 18391. The colony of Lactobacillus parafalaginis GBW-HB1903 is round, milky white, 1-2 μm in diameter, smooth and moist, glossy, slightly protruding in the middle, opaque, clear edges, halo. The Lactobacillus parafalaginis GBW-HB1903 according to claim 1, wherein there is no ring. The Lactobacillus parafalaginis GBW- according to claim 1, wherein the Lactobacillus parapharaginis GBW-HB1903 is a facultative anaerobic bacterium and has a growth dissolved oxygen dissolution concentration of 0.2 to 3 mg / L. HB1903. The Lactobacillus parafalaginis GBW-HB1903 according to claim 1, wherein the optimum growth oxygen dissolution concentration of the Lactobacillus parafalaginis GBW-HB1903 is 2 to 3 mg / L. The Lactobacillus parafalaginis GBW-HB1903 according to claim 1, wherein the optimum growth temperature of the Lactobacillus parafalaginis GBW-HB1903 is 25 to 35 ° C. The Lactobacillus parafalaginis GBW-HB1903 according to claim 1, wherein the optimum pH value of the Lactobacillus parafalaginis GBW-HB1903 is 6.5 to 7.5. Application of Lactobacillus parafalaginis GBW-HB1903 according to any one of claims 1-6 used for decomposing nitrate nitrogen in sewage in the production of a microbial agent. The seventh aspect of the present invention, wherein the Lactobacillus parapharaginis GBW-HB1903 obtains a Lactobacillus parafaraginis solution by fermentation and culturing, and the fermentation temperature is 28 to 32 ° C. and the fermentation time is 20 to 22 hours. Application. The application according to claim 8, wherein the amount of the fermenting bacterial solution added to Lactobacillus parafalaginis is 0.1 to 0.5 ‰ of the volume of the sewage pond. In an aerobic environment, the removal rate of nitrate nitrogen of Lactobacillus parafaraginis GBW-HB1903 is higher than 85%, and in an oxygen-deficient environment, the removal rate of nitrate nitrogen of Lactobacillus parafaraginis GBW-HB1903 is higher than 85%. The application according to claim 7, characterized in that it is expensive.

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