CN108085283B - method for culturing high-density algae through symbiosis of bacteria and algae - Google Patents
method for culturing high-density algae through symbiosis of bacteria and algae Download PDFInfo
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Abstract
The invention provides a high-density symbiotic cultivation method of bacteria and algae, which is characterized by comprising the following steps: 1) selecting chlorella algae, inoculating the chlorella algae into a growth culture medium, culturing at 25-26 ℃ under the illumination of 5000lux, and growing to a logarithmic growth phase to obtain a seed solution, wherein each liter of the growth culture medium contains: 5g of glucose, 1g of yeast powder, 1g of ferrous sulfate, Na2SO32g, 0.5g of sodium chloride, 0.1g of borax, 1g of monopotassium phosphate, 1g of magnesium sulfate and 1g of ammonium chloride; (2) inoculating the seed liquid obtained in the step (1) into an amplification culture medium according to the volume ratio of 15% for culture; (3) the scale-up culture is carried out at 20 + -10 deg.C, 2000 + -500 LUX, and shaking speed of 20-100 rpm. The culture method is simple, convenient and easy to operate, is green and environment-friendly, and is beneficial to large-scale production.
Description
Technical Field
The invention belongs to the technical field of biology, and particularly relates to a method for culturing high-density algae through symbiosis of bacteria and algae.
Disclosure of Invention
Microalgae is a general term for microorganisms containing chlorophyll A and capable of photosynthesis, the individual is tiny, the form can be generally distinguished under a microscope, the microalgae is widely distributed, and are distributed in land lakes and ocean water areas, and floating microalgae plays a significant role in material circulation and energy flow of pond culture, and is indispensable for maintaining the normal function of a pond ecosystem and stabilizing the pond environment. The phytoplankton of chlorophyta and cyanophyta can become dominant species in natural water, for the culture pond, people hope that the phytoplankton of chlorophyta beneficial to culture objects in the culture pond can occupy dominant species in the water, and the excellent phytoplankton of the planktonic microalgae can promote the decomposition and conversion of nutritive salt in the water, reduce and eliminate various toxic substances such as ammonia nitrogen, nitrite nitrogen, organic pollutants and the like in the processes of stable population and continuous increase of biomass; but also can generate oxygen through photosynthesis to increase dissolved oxygen of the culture water body and promote the oxidative decomposition of oxygen-consuming organic matters in the water body.
chlorella (Chlorella) is a kind of unicellular green algae of genus Chlorella of phylum Chlorophytum, is a kind of spherical unicellular freshwater algae, the diameter is 3-8 microns, one of the earliest life on the earth, appear more than 20 hundred million years ago, it is a kind of high-efficient photosynthetic plant, grow and reproduce with photoautotrophy, the distribution is extremely wide. The chlorella is born in fresh water, and the chlorella can divide into 4 cells at intervals of 20 hours by virtue of sunlight, water and carbon dioxide to generate vigorous reproductive capacity, continuously convert solar energy into chlorella bodies containing various nutritional ingredients and release a large amount of oxygen in proliferation; and its photosynthetic capacity is more than 10 times higher than that of other plants. The chlorella can be used as excellent natural bait for aquatic economic animals, and can absorb elements such as nitrogen and phosphorus in water, reduce eutrophication level of water body, and purify water quality. Moreover, the chlorella is rich in grease and can be used for producing biodiesel; also contains some hydrocarbon substances, and can be processed into gasoline and diesel oil after extraction. If the chlorella is cultured in a large amount by using the sewage and has high oil content and hydrocarbon content, not only can the deterioration of water quality be relieved, but also a large amount of high-quality raw materials can be provided for producing biomass.
At present, the growth of microalgae belongs to the hot research discipline, and the optimization of microalgae culture conditions and the accumulation of oil and fat become the key points of research. At present, the large-scale culture of microalgae mainly has two ways, namely autotrophic culture and heterotrophic fermentation, wherein the autotrophic culture can fix greenhouse gas carbon dioxide and release oxygen, and is environment-friendly, but the utilization of light energy is often greatly limited due to the mutual shielding effect among microalgae cells. The higher the cell concentration is, the more obvious the shielding effect is, and the growth and fat synthesis of the cells are seriously influenced, which makes it very difficult to realize high-density culture of oil-containing microalgae in a photo-bioreactor. For heterotrophic culture, the growth of cells depends mainly on the absorption of organic carbon sources by the cells, and since it is not limited by light, high-density fermentation and efficient synthesis of fat can be achieved by feeding organic carbon. Although heterotrophic culture has the advantages of high growth rate, short culture period, easy control of the culture process and the like, the method for producing biodiesel by using heterotrophic microalgae has the main problem that the method depends on organic carbon sources (such as glucose, starch and the like) as raw materials, and the production cost is increased. In the prior art, most of microalgae are produced by utilizing a photobioreactor, the research of the photobioreactor focuses on the research of the general production technology to the research of deep processing and special substance extraction of the microalgae, the technology for producing chlorella in Taiwan in China is quite mature, products of some chlorella are accepted by the masses, although the research on the chlorella is carried out in the 20 th century and the 60 th century in China, the cost is reduced because large-scale production cannot be carried out, therefore, the method only stays in the stage of producing primary products, so that the input-output ratio is extremely unbalanced, the process of developing and researching the primary products is restricted, the biomass of a large-scale open culture mode in China reaches about 1000 ten thousand/ml, the method is limited by low input and high output, the difference from the foreign culture level is large, in addition, the prior art also provides a method for preparing the biodiesel by using starch enzymolysis to culture heterotrophic algae and performing fast pyrolysis. The patent takes low-quality grain starch as a raw material, prepares a culture solution by using an aqueous solution of glucose prepared by enzymolysis of starch, and obtains heterotrophic chlorella by a heterotrophic conversion technology; then the heterotrophic algae cells with high fat content are used for fast pyrolysis to obtain the biodiesel with high yield and high quality. The method selects low-quality grain starch to hydrolyze and then provides glucose to be used as an organic carbon source, so that the cost is high and the large-scale production is difficult to realize.
In recent years, the breeding industry in China is rapidly developed, and breeding wastewater contains a large amount of nitrogen and phosphorus and organic matters with extremely high concentration and is regarded as high-concentration sewage, and direct discharge can cause water eutrophication and water source pollution. In addition, the aquaculture wastewater carries a large amount of pathogenic bacteria, emits extremely strong odor and increasingly causes serious pollution to the environment. The protection of ecological environment is not slow enough.
The microalgae has high oil content, can be cultivated by various water bodies, has the advantages of not occupying cultivated land and the like, and the microalgae is cultivated by using the cultivation wastewater, so that the problem of environmental pollution caused by direct discharge of the wastewater is solved, the resource utilization of the cultivation wastewater is realized, and positive influences are generated on both energy and environment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for improving the biomass of algae. The invention is realized by adopting the following technical scheme:
An algae cultivation method is characterized by comprising the following steps:
(1) Selecting chlorella algae, inoculating the chlorella algae into a triangular flask containing 100mL of growth medium, culturing at 25-26 ℃ under the illumination of 5000lux, and shaking the triangular flask for 2-3 times every day. The color of the culture solution can be observed to gradually turn green after 3-4 days. And (3) obtaining a seed solution (algae solution) when the algae grows to the logarithmic growth phase, wherein each liter of the growth culture medium contains: 5g of glucose, 1g of yeast powder, 1g of ferrous sulfate, Na2SO32g, 0.5g of sodium chloride, 0.1g of borax, 1g of monopotassium phosphate, 1g of magnesium sulfate and 1g of ammonium chloride.
Said Chlorella is Chlorella sp ATCC30412
(2) Inoculating the algae liquid obtained in the step (1) into an expanding culture medium according to the volume ratio of 15%, wherein the expanding culture medium comprises the following components: and (3) fungus residue hydrolysate: growth medium (used in step 1): mixing the bacillus culture solutions according to the volume ratio =6-7:2-3: 1-2;
the fungus residue hydrolysate is as follows: and (2) centrifuging the amino acid mother liquor obtained after the amino acid fermentation is finished, collecting mycoprotein, adjusting the solid content of the mycoprotein to 8%, adding 5-10wt% of 1mol/L NaOH, and hydrolyzing at normal temperature for 5-8 days to obtain a bacterial residue hydrolysate.
The bacillus culture solution is as follows: activating and culturing bacillus amyloliquefaciens ATCC 23843 and bacillus pumilus ATCC700814, inoculating the activated and cultured bacillus amyloliquefaciens and the bacillus pumilus to triangular flasks, performing shake culture, respectively culturing the activated and cultured bacillus amyloliquefaciens and the bacillus pumilus to obtain bacterial liquids with the concentration of 1 x 108 bacteria/ml, and mixing the bacterial liquids according to the volume ratio of 1: 1.
(3) Performing scale-up culture at 20 + -10 deg.C, 2000 + -500 LUX, and shaking at 20-100 rpm;
The traditional chlorella culture medium contains more than 20 chemicals such as macroelements, trace elements, vitamins and partial growth regulators, and has the disadvantages of troublesome operation, large workload, especially few trace elements and elements, small dosage, large error and inconvenience in transportation, commercialization and marketization. The culture medium disclosed by the invention only contains 9 nutrient elements, is convenient to use, small in workload, convenient to store and transport, convenient for factory, standard, marketized, commercialized and specialized production of the culture solution, accurate in quantification of trace components and elements and small in error. And can also realize better chlorella culture effect;
After the microalgae is cultured by adopting a culture medium, a cheap carbon source is added in the process of expansion culture as a growth carbon source in the process of heterotrophic culture, the cheap carbon source is processed mushroom dregs, the carbon source has better growth advantages than the method of simply adding the heterotrophic carbon source such as glucose or starch hydrolysate, meanwhile, the method realizes the recycling of the mushroom dregs in the conventional biological fermentation production, solves the pollution problem of the mushroom dregs, can also change waste into valuable, and is more favorable for the absorption of nutrient substances by adopting an alkaline hydrolysis mode in order to be better absorbed and utilized by the chlorella because the mushroom dregs are basically solid substances;
the bacteria of the invention can obtain the bacteria liquid with required concentration by a conventional culture method, is limited by space and is not described in detail.
Detailed Description
Example 1:
An algae cultivation method is characterized by comprising the following steps:
(1) And (3) selecting chlorella algae seeds to be cultured in a triangular flask containing 100mL of growth medium under the illumination of 5000lux at 26 ℃, and shaking the triangular flask for 2-3 times every day. The color of the culture solution can be observed to gradually turn green after 3-4 days. And (3) obtaining a seed solution (algae solution) when the algae grows to the logarithmic growth phase, wherein each liter of the growth culture medium contains: 5g of glucose, 1g of yeast powder, 1g of ferrous sulfate, Na2SO32g, 0.5g of sodium chloride, 0.1g of borax, 1g of monopotassium phosphate, 1g of magnesium sulfate and 1g of ammonium chloride.
Said Chlorella is Chlorella sp ATCC30412
(2) inoculating the algae liquid obtained in the step (1) into an expanding culture medium according to the volume ratio of 15%, wherein the expanding culture medium comprises the following components: and (3) fungus residue hydrolysate: growth medium: mixing the bacillus culture solutions according to the volume ratio =6:2: 1;
The fungus residue hydrolysate is as follows: and (2) centrifugally collecting mycoprotein from the amino acid mother liquor obtained after the amino acid fermentation is finished, adjusting the solid content of the mycoprotein to be 8%, adding 5wt% of 1mol/L NaOH, and hydrolyzing for 5d at normal temperature to obtain a bacterial residue hydrolysate.
Bacillus amyloliquefaciensThe bacillus culture solution is as follows: respectively taking Bacillus amyloliquefaciens (Bacillus amyloliquefaciens) ATCC 23843 and Bacillus pumilus ATCC700814, performing activated culture, inoculating the activated culture into triangular flasks, performing shake culture, respectively culturing to obtain bacterial liquids with the concentration of 1 x 108 bacteria/ml, and mixing according to the volume ratio of 1: 1.
(3) Performing scale-up culture at 20 + -10 deg.C, 2000 + -500 LUX, and shaking at 20-100 rpm;
example 2:
An algae cultivation method is characterized by comprising the following steps:
(1) And (3) selecting chlorella algae seeds to be cultured in a triangular flask containing 100mL of growth medium under the illumination of 5000lux at 26 ℃, and shaking the triangular flask for 2-3 times every day. The color of the culture solution can be observed to gradually turn green after 3-4 days. And (3) obtaining a seed solution (algae solution) when the algae grows to the logarithmic growth phase, wherein each liter of the growth culture medium contains: 5g of glucose, 1g of yeast powder, 1g of ferrous sulfate, Na2SO32g, 0.5g of sodium chloride, 0.1g of borax, 1g of monopotassium phosphate, 1g of magnesium sulfate and 1g of ammonium chloride.
Said Chlorella is Chlorella sp ATCC30412
(2) inoculating the algae liquid obtained in the step (1) into an expanding culture medium according to the volume ratio of 15%, wherein the expanding culture medium comprises the following components: and (3) fungus residue hydrolysate: growth medium: mixing the bacillus culture solutions according to the volume ratio =7:3: 2;
The fungus residue hydrolysate is as follows: and (2) centrifuging the amino acid mother liquor obtained after the amino acid fermentation is finished, collecting mycoprotein, adjusting the solid content of the mycoprotein to be 8%, adding 10wt% of 1mol/L NaOH, and hydrolyzing at normal temperature for 8d to obtain the bacterial residue hydrolysate.
Bacillus amyloliquefaciensThe bacillus culture solution is as follows: activating and culturing Bacillus amyloliquefaciens (Bacillus amyloliquefaciens) ATCC 23843 and Bacillus pumilus ATCC700814, inoculating the activated and cultured Bacillus amyloliquefaciens and the Bacillus amyloliquefaciens into triangular flasks for shake culture, respectively culturing the Bacillus amyloliquefaciens and the Bacillus amyloliquefaciens to obtain bacterial liquids with the concentration of 1 x 108 bacteria/ml, and mixing the bacterial liquids according to the volume ratio of 1: 1.
(3) Performing scale-up culture at 20 + -10 deg.C, 2000 + -500 LUX, and shaking at 20-100 rpm;
example 3
Symbiotic experiment of chlorella and bacillus and large-scale treatment of bacterial residues: the chlorella is symbiotically cultured by adopting the bacillus amyloliquefaciens, the bacillus pumilus and the chlorella, the growth of the chlorella is further promoted, and a system of the chlorella and the bacillus is added, so that the growth of the bacillus has a synergistic promotion effect on the growth of the chlorella.
And (3) measuring the oil content: centrifuging the algae liquid in a stabilizer at 3000r/min, cleaning the algae mud with deionized water, drying at 65 ℃ in an electric heating blower drying box to obtain algae powder, crushing cell walls of the algae powder, placing the algae powder in a test tube with a plug mill, adding absolute ethyl alcohol, uniformly mixing, extracting at room temperature for 3h, properly and uniformly mixing during the period, transferring supernatant into a centrifuge tube, adding activated clay for decolorization, centrifuging to collect supernatant, placing the supernatant in the electric heating blower drying box to evaporate the absolute ethyl alcohol, weighing, and calculating the oil content, wherein the oil content = oil content/algae powder mass%;
Experimental groups: following the procedure of example 1;
Control 1 group: a bacillus symbiotic system is not used, namely the bacillus culture solution is deleted from the expanded culture medium, and the rest is the same;
Control 2 group: the expanded culture medium does not contain mushroom residue hydrolysate, and the rest is the same;
Control 3 group: the expanded culture medium only contains the fungus dreg hydrolysate and the bacillus culture solution, and the rest is the same;
In the control 4 group, the paenibacillus strain disclosed in CN2015100638727 was added to the expanding medium, and the rest was the same;
In the control group 5, the expanding medium was deleted from the Bacillus amyloliquefaciens culture, i.e., the Bacillus culture was a Bacillus pumilus culture.
All the above were cultured in culture flasks, and after 2 days, color recording was started, and microalgae cells in each flask were counted every 24h using a microscope and a red blood cell counting plate. Counting the counting result and drawing a growth curve for comparison. The results are shown in Table 1:
TABLE 1 symbiotic experiments
| Color of culture flask | Chlorella cell concentration | The oil content wt% | |
| Experimental group | the color of the culture bottle turns green after 2 days, and the color gradually deepens | 106.1X 1010 cells/mL | 44.7 |
| Control 1 | day 4 the culture flask was green in color | 91.2X 109/mL | 31.4 |
| Control 2 | The color of the culture bottle turns green after 2 days, and the color gradually deepens | 104.9X 1010 cells/mL | 42.3 |
| Control 3 | day 3 color green | 91.9X 109/mL | 40.3 |
| Control 4 | Day 3 color change to green | 101.8X 1010 cells/mL | 39.2 |
| Control 5 | Day 3 color change to green | 102.2X 1010 cells/mL | 33.7 |
the experiments show that the bacillus and chlorella symbiotic system can produce larger chlorella concentration, the color of the culture bottle turns green 2 days after inoculation, and compared with a control group 1-3, the group shows deeper green, which indicates that the number of chlorella cells is obviously increased compared with the latter, and due to the symbiotic promotion relationship of bacillus and chlorella, the growth microenvironment of chlorella is improved by the existence of bacillus amyloliquefaciens and bacillus pumilus, so that the biomass of chlorella is more, and the oil content is more obvious than that of the control group. In the control group 1, due to the elimination of symbiotic conditions of bacillus, the growth of chlorella is relatively retarded, the logarithmic phase biomass is obviously reduced compared with that of an experimental group, and the oil content of the produced chlorella is relatively low. Compared with the control group 2, the experimental group of the application uses the fungus dreg culture solution in the enlarged culture, not only realizes the waste utilization, but also obtains the results which are basically similar to the results obtained by the conventional culture, has equivalent effects on the oil content, the growth speed and the biomass compared with the growth culture medium, utilizes the cheap carbon source and greatly saves the energy. Compared with the experimental group, the control group 3 directly enters the dreg hydrolysate and the bacillus amyloliquefaciens culture solution for culture after the algae solution is obtained, no components of the previous culture solution exist, the chlorella grows slowly compared with the experimental group due to the lack of a certain domestication environment, and finally the biomass is also influenced; compared with an experimental group, the symbiotic bacillus is replaced by the bacillus amyloliquefaciens and the bacillus pumilus to be paenibacillus in the comparison group 4, the biomass obtaining and the oil content are improved to a certain extent compared with those of a chlorella symbiotic system without using bacteria and algae, however, the chlorella symbiotic system has more excellent effects on the biomass and the oil content of the produced chlorella, the biomass of chlorella cells is improved by 2.38 times, the oil content is improved by 14%, the chlorella and the bacillus are shown to have more excellent synergistic effects, and a comparison test 5 can show that the bacillus amyloliquefaciens and the bacillus pumilus can play a synergistic effect in promoting algae symbiosis.
Example 4
growth medium screening assay
BG-11 is a common culture medium for algae culture, however, it contains macroelements, microelements, vitamins and part of growth regulators, and has complex operation and large workload, 15-20 kinds of nutrient elements are needed by chlorella in the growth process, most of the elements do not become restriction, therefore, C, N and P are main elements for growth, and have great influence on growth and accumulation of chlorella, and the applicant of the present application obtains simple culture medium components of chlorella by orthogonal optimization experiment deletion: 5g of glucose, 1g of yeast powder, 1g of ferrous sulfate, Na2SO32g, 0.5g of sodium chloride, 0.1g of borax, 1g of monopotassium phosphate, 1g of magnesium sulfate and 1g of ammonium chloride. Compared with the prior art, the chlorella culture medium is convenient to use, has small preparation workload, and can also realize better chlorella culture effect.
experimental groups: and (3) selecting chlorella algae seeds to be cultured in a triangular flask containing 100mL of growth medium under the illumination of 5000lux at 26 ℃, and shaking the triangular flask for 2-3 times every day. Obtaining seed liquid (algae liquid) when the algae grows to logarithmic phase;
Control 1 group: replacing the growth medium with BG-11 for the rest of the experimental groups;
Control 2 group: the growth medium is prepared by taking ammonium bicarbonate and calcium superphosphate cultured in a conventional soil pond as nutrient sources for culture, and the rest of the experimental groups are the same.
The results are shown in Table 2
TABLE 2 growth Medium screening test
| Growth rate (after 5 d) | Growth state | |
| Experimental group | 0.341d-1 | After 3 days, the green color of the leaves is changed to be green, and the green color content of the leaves is obviously increased |
| control 1 group | 0.347 d-1 | after 3 days, the green color of the leaves is changed to be green, and the green color content of the leaves is obviously increased |
| Control 2 group | 0.102 d-1 | The surface forms an algae membrane, the wall attachment is serious, microscopic cells are adhered, and the cell bodies are decomposed and die in a certain proportion |
as can be seen, the culture medium of the application achieves basically similar results compared with BG-11, greatly simplifies the components of the culture medium and reduces the cost.
example 5 feeding experiment
Experimental groups: adding the algae obtained by culturing in the example 2 into the crushed and sieved crucian feed raw material according to the mass ratio of 30%, uniformly mixing, preparing into granulated feed by using a granulator, drying, and feeding crucian with the daily feeding amount of 3% -5% of the weight of the crucian.
The experimental crucian fries are respectively cultured in aquarium with the volume of 500L, and 20 fish are cultured in each aquarium.
Control group: during the process of culturing chlorella, bacillus is not added, and the rest of the experimental groups are the same.
Each feed is repeated for three times, after 8 weeks of culture, the experimental fish is fasted for one day and then weighed, after dissection, muscle samples are taken for conventional nutrient component analysis, and liver samples are taken for nonspecific immunity index and antioxidant index determination, and the results are shown in Table 3.
TABLE 3 feeding experiment
| Rate of weight gain | Coefficient of bait | Survival rate | Moisture (muscle nutrient) | |
| experimental group | 139.22±6.13 | 2.01±0.23 | 95% | 76.45±1.17 |
| control group | 103.12±5.14 | 2.92±0.13 | 90% | 78.13±1.46 |
the experiments show that the chlorella prepared by the method has obvious effect in crucian feeding experiments, and compared with the method of only culturing the chlorella in a control group, the method has the advantages that the weight gain rate and the survival rate of the crucian are improved, the bait coefficient is reduced, the bait utilization rate is improved, the moisture content of the fed crucian is reduced, and the protein quality is enhanced.
Example 6 algal bacteria System Sewage treatment experiment
Adding 10% v/v of the phycomycetes system subjected to the enlarged culture in the example 1 into artificial sewage, wherein the pH of the artificial sewage is 7.0-8.0, and the COD content is 500mg/L, TN content and 100 mg/L, TP content and 5.3 mg/L; and (2) aerating simulated flue gas into the reactor, wherein the simulated flue gas comprises 5-20% of CO2 and 50-100ppm of NO, and the other components are N2, wherein after the reactor is operated for one day, the average concentration of gas components at the outlet of the reactor is stabilized at 2.5% of CO2 and 33ppm of NO (nitrogen equilibrium), culturing for 3 days, collecting microalgae by adopting a centrifugal method, and discharging treated water. The removal rates of COD, TN and TP of the treated sewage are respectively 88%, 91% and 97%, and the effluent reaches the secondary discharge standard of pollutant discharge Standard of municipal wastewater treatment plant (GB 8978-2002).
In the control group, the bacillus culture solution is not added, and the rest is the same as the example 1, 10% v/v of the obtained chlorella system is added into the artificial sewage, the pH of the artificial sewage is 7.0-8.0, the COD content is 500mg/L, TN, the content is 100 mg/L, TP, and the content is 5.3 mg/L; and (3) aerating simulated flue gas into the reactor, wherein the simulated flue gas comprises 5-20% of CO2 and 50-100ppm of NO, and the rest components are N2, culturing for 3 days, collecting microalgae by adopting a centrifugal method, and discharging treated water. The removal rates of COD, TN and TP of the treated sewage are respectively 54%, 65% and 72%, and compared with the experimental group, the difference is obvious.
The treatment effect of the chlorella symbiotic system of bacillus on sewage is obviously greater than that of a single chlorella system.
Although the present invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the present invention. Accordingly, it is intended that all such modifications and variations as fall within the true spirit of this invention be included within the scope thereof.
Claims (3)
1. a method for culturing high-density algae by symbiosis of bacteria and algae comprises the following steps:
(1) selecting chlorella, inoculating the chlorella into a growth culture medium, culturing at 25-26 ℃ under the illumination of 5000lux, and obtaining a seed solution after the chlorella grows to a logarithmic growth phase, wherein each liter of the growth culture medium contains: 5g of glucose, 1g of yeast powder, 1g of ferrous sulfate, Na2SO32g, 0.5g of sodium chloride, 0.1g of borax, 1g of monopotassium phosphate, 1g of magnesium sulfate and 1g of ammonium chloride;
(2) Inoculating the seed liquid obtained in the step (1) into an amplification culture medium according to the volume ratio of 15% for amplification culture;
(3) performing scale-up culture at 20 + -10 deg.C, 2000 + -500 LUX, and shaking at 20-100 rpm;
the expanding culture medium comprises the following components: and (3) fungus residue hydrolysate: growth medium: mixing the bacillus culture solutions according to the volume ratio =6-7:2-3: 1-2;
The fungus residue hydrolysate is as follows: centrifuging amino acid mother liquor obtained after amino acid fermentation is finished, collecting mycoprotein, adjusting the solid content of the mycoprotein to 8%, adding 5-10wt% of 1mol/L NaOH, and hydrolyzing at normal temperature for 5-8d to obtain a bacterial residue hydrolysate;
The bacillus culture solution is prepared by the following method: respectively carrying out activated culture on bacillus amyloliquefaciens ATCC 23843 and bacillus pumilus ATCC700814, respectively inoculating the bacillus amyloliquefaciens ATCC 23843 and the bacillus pumilus ATCC700814 into triangular flasks, respectively carrying out shaking culture on the bacillus amyloliquefaciens and the bacillus pumilus ATCC700814, culturing the bacillus amyloliquefaciens and the bacillus pumilus to obtain bacterial liquid with the concentration of 1 x 108 bacteria/ml, and mixing the bacterial liquid according to the volume ratio of;
The chlorella is chlorella.
2. Use of the product obtained by the process of claim 1 for the treatment of sewage.
3. Use of the product obtained by the process of claim 1 for feeding feed.
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