CN108753652B - Method for degrading basket algae - Google Patents
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- CN108753652B CN108753652B CN201810611502.6A CN201810611502A CN108753652B CN 108753652 B CN108753652 B CN 108753652B CN 201810611502 A CN201810611502 A CN 201810611502A CN 108753652 B CN108753652 B CN 108753652B
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- 230000000593 degrading effect Effects 0.000 title claims abstract description 46
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- 241000589755 Pseudomonas mendocina Species 0.000 claims abstract description 54
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/38—Pseudomonas
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- C12N1/20—Bacteria; Culture media therefor
- C12N1/205—Bacterial isolates
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- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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Abstract
The invention discloses a method for degrading basket algae, which comprises the following steps: inoculating 0.005-10% of degrading bacteria liquid into culture liquid of Schizochytrium, and co-culturing at 15-35 ℃, pH 5-10 and illumination intensity of 1600-2300lux, wherein the degrading bacteria liquid is prepared from Pseudomonas mendocina (Pseudomonas mendocina), the Pseudomonas mendocina is preserved in Guangdong province microorganism strain preservation center 12-8 days 2017, and the biological preservation number is as follows: GDMCC 60297. The method adopts the degrading bacteria liquid to degrade the basket algae, and has the advantages of small investment, short treatment time and high removal rate.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for degrading basket algae.
Background
In recent years, along with the rapid development of economy and the continuous improvement of life quality, more and more production and living wastewater with rich nutrition and complex components is discharged into rivers and lakes. The wastewater containing a large amount of pollutants such as nitrogen, phosphorus and the like causes eutrophication of discharged water, seriously causes blue algae outbreak, destroys the ecological environment of the water, and threatens the survival of aquatic organisms and even the health of human beings. In recent years, the eutrophication of domestic fresh water bodies is more and more serious, and a large amount of algae grows in large-scale lakes, reservoirs and aquaculture water bodies, so that cyanobacterial bloom is formed seriously. The Schistophytes are main algae species causing cyanobacterial bloom in China, and algal toxins can be released in the metabolic process of the Schistophytes, so that the Schistophytes have serious influence on the production and life of human beings. Therefore, the treatment of the cyanobacterial bloom is not slow.
At present, three methods for treating cyanobacterial bloom are mainly used: the method has the advantages that the method directly removes algae in the water body and does not produce secondary pollution, but has low efficiency, high cost and difficult large-scale operation, and the method cannot be suitable for landscape water bodies with larger scale; second, chemical methods, e.g. addition of CuSO4The algicide and the flocculant have the advantages of simple operation and quick response, but the added chemical agent has toxic action on aquatic organisms and is easy to cause secondary pollution; thirdly, biological methods, such as population competition algae inhibition, fish phagocytosis algae removal, microorganism algae removal and comprehensive prevention and control methods are biological control technologies aiming at lake eutrophication. The biological method has the advantages of low price, high efficiency, safety, maintenance of ecological balance of the water body and the like, and is a hotspot of water eutrophication treatment research at present. For large-area water bodies, physical and chemical methods are not beneficial to implementation, and biological methods utilize biological interaction and biological natural propagation, so that algae removal and control of the large-area water bodies can be effectively realized.
The bacteria and the microalgae are two organisms with the widest and the largest quantity respectively in the water environment, and in the natural environment, the bacteria and the microalgae jointly maintain the balance of nitrogen, phosphorus and other nutrient substances in the aquatic ecosystem. Algae-lysing bacteria exist in the nature and play an important role in maintaining the balance of algae biomass, and when a large amount of nutrient substances such as nitrogen and phosphorus exceed the standard, the balance is broken, the algae is propagated in a large amount, and the naturally-existing algae-lysing bacteria are difficult to maintain the balance of the algae biomass continuously. Therefore, the separated high-efficiency algae-lysing bacteria can be used for controlling the blue algae, and the blue algae control becomes a hot spot of the current blue algae bloom control. At present, many bacteria having an algicidal function have been reported, and among them, bacillus, pseudomonas, bacteroides, and the like are mainly used.
The patent with publication number CN1055861395A discloses a composite microbial inoculum DH-1 for effectively inhibiting water bloom microcystis aeruginosa and application thereof. The complex bacterium agent DH-1 of this patent includes bacteria of the genus Pseudomonas, bacteria of the genus Shen-Shi, bacteria of the genus Thermomonomonas, bacteria of the genus Devorax and bacteria of the genus Hizikia. The patent achieves the aim of inhibiting (removing) microcystis aeruginosa through the action of microbial aquatic micro-ecological regulation and phycomycete interaction. However, the patent requires the synergistic action of a plurality of strains, the input amount is large, the treatment time is more than 8 days, and the inhibition rate is only 84.4%.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for degrading basket algae, which adopts degrading bacteria liquid to degrade the basket algae, and has the advantages of small input amount, short treatment time and high removal rate.
In order to solve the technical problem, the invention provides a method for degrading basket algae, which comprises the following steps: inoculating 0.005-10% of degrading bacteria liquid into culture liquid of Schizochytrium, and co-culturing at 15-35 ℃, pH 5-10 and illumination intensity of 1600-2300lux, wherein the degrading bacteria liquid is prepared from Pseudomonas mendocina (Pseudomonas mendocina), the Pseudomonas mendocina is preserved in Guangdong province microorganism strain preservation center 12-8 days 2017, and the biological preservation number is as follows: GDMCC 60297.
As an improvement of the scheme, the degraded bacterium liquid comprises untreated bacterium liquid, bacterium body weight suspension and sterile supernatant.
As an improvement of the scheme, the addition amount of the degrading bacteria liquid is 0.05-10%.
As an improvement of the scheme, the preparation method of the degradation bacterial liquid comprises the following steps:
(1) taking pseudomonas mendocina preserved in a refrigerator, streaking on a nutrient broth solid culture medium plate, and culturing at 26-33 ℃ for 10-16h until a single colony grows out;
(2) inoculating a single colony of pseudomonas mendocina to a nutrient broth liquid culture medium, culturing for 10-16h under the conditions that the temperature is 26-33 ℃ and the revolution is 150-250rpm to reach the logarithmic growth phase, transferring to a fresh nutrient broth liquid culture medium according to the addition amount of 0.5-2%, and continuously culturing to the logarithmic growth phase according to the conditions to obtain untreated bacterial liquid;
(3) centrifuging the untreated bacteria liquid, collecting the centrifuged bacteria, and resuspending the bacteria with sterile water to obtain a bacteria weight suspension;
(4) centrifuging the untreated bacteria liquid, collecting the centrifuged supernatant, and filtering the supernatant by using a filter membrane with the pore diameter of less than 0.5 mu m to obtain the sterile supernatant.
As an improvement of the above scheme, the centrifugal rotation number is 8000-.
As an improvement of the above scheme, the pore diameter of the filter membrane is less than or equal to 0.22 μm.
As an improvement of the scheme, the preparation method of the culture solution of the basket algae comprises the following steps: the basket algae is inoculated in BG11 culture medium according to the addition of 5-20%, and cultured to logarithmic phase under the conditions of temperature of 15-35 ℃ and illumination intensity of 1600-.
As an improvement of the scheme, 700-1500mg/L carbon source is added into the culture solution of the basket algae.
As an improvement of the scheme, the carbon source is one or more of glucose, sodium acetate, trisodium citrate and starch.
As an improvement of the scheme, the culture conditions of the culture solution for inoculating the degraded bacterial liquid to the basket algae are as follows: the pH value is 5.5-8.5, and the temperature is 20-35 ℃.
The implementation of the invention has the following beneficial effects:
the method for degrading the basket algae provided by the invention adopts the degrading bacteria liquid to degrade the basket algae, and has the advantages of small input amount, short treatment time and high removal rate. The pseudomonas mendocina is cultured to prepare the degrading bacterial liquid, so that the algae reducing capacity of the strain is improved. In addition, the pseudomonas mendocina is cultured to the logarithmic phase, so that the metabolic products of algae lysis reach the peak value, and the capability of the strains for degrading the basket algae is improved.
Drawings
FIG. 1 is a graph showing the algae-lysing effect of example 1 of the present invention;
FIG. 2a is a microscopic image of Schistosoma before adding bacteria liquid under 400 times microscope in example 1 of the present invention;
FIG. 2b is a microscopic image of Schistosoma japonicum after adding bacteria solution under 400 times microscope in example 1;
FIG. 3 is a graph showing the algae-lysing effect in example 2 of the present invention;
FIG. 4 is a histogram of the algicidal effect of example 3 of the present invention;
FIG. 5 is a histogram of the algae lysing effect of example 4 of the present invention;
FIG. 6 is a histogram showing the algae-lysing effect of example 5 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a method for degrading basket algae, which comprises the following steps: inoculating 0.005-10% of degrading bacterial liquid into culture liquid of Schizochytrium, and co-culturing at 15-35 ℃, pH 5-10 and illumination intensity of 1600-2300lux, wherein the degrading bacterial liquid is prepared from Pseudomonas mendocina (Pseudomonas mendocina), and the Pseudomonas mendocina is stored in Guangdong province microorganism strain preservation center 12-8 days 2017, and the biological preservation number is: GDMCC 60297. The pseudomonas mendocina has a high-efficiency algae inhibiting function.
It should be noted that temperature, pH and intensity of control have important effects on the dissolution and inhibition effects of Schistosoma. Because the degrading bacteria liquid of the application needs pseudomonas mendocina to be prepared, and the growth, propagation and metabolism of pseudomonas mendocina are caused by temperature and pH value. Pseudomonas mendocina stops growing and even dies when the pH is less than 5 or greater than 10. Preferably, the culture conditions of the culture solution for inoculating the degraded bacterial liquid to the basket algae are as follows: the pH value is 5.5-8.5, and the temperature is 20-35 ℃.
Specifically, the degraded bacterial liquid comprises untreated bacterial liquid, bacterial weight suspension and sterile supernatant.
Preferably, the degrading bacterial liquid comprises untreated bacterial liquid and sterile supernatant, wherein the addition amount of the degrading bacterial liquid is 0.05-10%.
Most preferably, the degraded bacterial liquid comprises untreated bacterial liquid, wherein the addition amount of the degraded bacterial liquid is 10%.
The untreated bacteria liquid and the sterile supernatant contain a large amount of secretory metabolites of pseudomonas mendocina, and the secretory metabolites have a good algae dissolving effect. The thallus heavy suspension only contains single Pseudomonas mendocina cells, and the growth of the thallus heavy suspension is not obvious in a carbon source-free environment, so that the algae dissolving effect is not obvious; under the carbon source environment, the pseudomonas mendocina grows and secretes algicidal substances, and has the effects of inhibiting and dissolving algae. Therefore, a carbon source capable of providing CODcr 700-1500mg/L can be added to the culture solution of Schizochytrium. Preferably, the carbon source is one or more of glucose, sodium acetate, trisodium citrate and starch.
The preparation method of the untreated bacterial liquid comprises the following steps:
(1) taking pseudomonas mendocina preserved in a refrigerator, streaking on a nutrient broth solid culture medium plate, and culturing at 26-33 ℃ for 10-16h until a single colony grows out;
(2) inoculating a single colony of pseudomonas mendocina to a nutrient broth liquid culture medium, culturing for 10-16h under the conditions that the temperature is 26-33 ℃ and the revolution is 150-250rpm to reach the logarithmic growth phase, transferring to a fresh nutrient broth liquid culture medium according to the addition amount of 0.5-2%, and continuously culturing to the logarithmic growth phase according to the conditions to obtain untreated bacterial liquid;
(3) centrifuging the untreated bacteria liquid, collecting the centrifuged bacteria, and resuspending the bacteria with sterile water to obtain a bacteria weight suspension;
(4) collecting the centrifuged supernatant, and filtering the supernatant with a filter membrane with a pore diameter of less than 0.5 μm to obtain a sterile supernatant.
Preferably, taking pseudomonas mendocina preserved in a refrigerator at the temperature of between 90 ℃ below zero and 60 ℃ below zero, streaking on a nutrient broth solid culture medium plate, and culturing for 12 to 14 hours at the temperature of between 28 and 31 ℃ until a single colony grows; inoculating a single pseudomonas mendocina colony to a nutrient broth liquid culture medium, culturing for 12-14h to an exponential phase under the conditions that the temperature is 28-31 ℃ and the revolution is 180-220rpm, transferring to a fresh nutrient broth liquid culture medium according to the addition amount of 0.5-2%, and continuously culturing to the exponential phase according to the conditions to obtain untreated bacteria liquid; collecting the centrifuged thallus, and carrying out heavy suspension by using sterile water to obtain a thallus suspension; filtering the centrifuged supernatant with a filter membrane with pore diameter less than 0.5um for sterilization to obtain sterile supernatant.
Preferably, taking pseudomonas mendocina preserved in a refrigerator at the temperature of between 85 ℃ below zero and 75 ℃ below zero, streaking on a nutrient broth solid culture medium plate, and culturing for 12 to 14 hours at the temperature of between 28 and 31 ℃ until a single colony grows; inoculating a single pseudomonas mendocina colony to a nutrient broth liquid culture medium, culturing for 12-14h to an exponential phase under the conditions that the temperature is 28-31 ℃ and the revolution is 180-220rpm, transferring to a fresh nutrient broth liquid culture medium according to the addition amount of 0.5-2%, and continuously culturing to the exponential phase according to the conditions to obtain untreated bacteria liquid; centrifuging the untreated bacteria liquid at 8000-15000rpm at 1-10 ℃, collecting bacteria, and then resuspending the bacteria with sterile water to obtain a bacteria suspension; filtering the centrifuged supernatant with a filter membrane with pore diameter less than 0.3 μm for sterilization to obtain sterile supernatant.
Preferably, the pseudomonas mendocina preserved in a refrigerator at the temperature of-80 ℃ is streaked on a nutrient broth solid culture medium plate, and is cultured for 14h at the temperature of 30 ℃ until a single colony grows out; inoculating a single pseudomonas mendocina colony to a nutrient broth liquid culture medium, culturing for 14h to an exponential growth phase under the conditions that the temperature is 30 ℃ and the revolution is 200rpm, transferring to a fresh nutrient broth liquid culture medium according to the addition amount of 0.5-2%, and continuously culturing to the exponential growth phase according to the conditions to obtain untreated bacterial liquid; centrifuging the untreated bacteria liquid at the centrifugation revolution of 10000rpm and the temperature of 4 ℃, collecting bacteria, and then resuspending the bacteria by using sterile water to obtain a bacteria weight suspension; filtering the centrifuged supernatant with a filter membrane with pore diameter of 0.22 μm to remove bacteria, and collecting the sterile supernatant.
Because the pseudomonas mendocina secretes metabolite algicidal mainly through indirect action, the pseudomonas mendocina is added into BG11 culture medium alone, and because the culture medium lacks carbon source, thalli can not grow and metabolize, and can not secrete corresponding metabolite to effectively dissolve algae. Therefore, the invention prepares the degrading bacterial liquid by culturing the pseudomonas mendocina, thereby improving the algae-reducing capability of the strain. In addition, the pseudomonas mendocina is cultured to the logarithmic phase, so that the metabolic products of algae lysis reach the peak value, and the capability of the strains for degrading the basket algae is improved. In addition, the growth of the pseudomonas mendocina can be promoted by adding a carbon source into the culture medium, so that the algae dissolving capacity of the strain is improved.
Therefore, by the invention, no matter what bacterial liquid form the pseudomonas mendocina is, better algae dissolving effect can be obtained.
The massive growth of phytoplankton is a major phenomenon of eutrophication of bodies of water, where chlorophyll a is the type of chlorophyll contained in all phytoplankton phyla. The chlorophyll a is not only used as an important index for dividing the water body nutrition state, but also can be used for representing the existing amount of phytoplankton. Therefore, the chlorophyll a content is used for characterizing the amount of algae cells in the water body. The chlorophyll a detection method comprises the following steps:
the glass fiber filter membrane is placed on a suction filter connected with a vacuum pump, and a water sample with a quantitative volume is accurately measured according to the chlorophyll concentration of the water sample for suction filtration. And (3) putting the filtered filter membrane into a glass centrifuge tube with a plug, adding 10mL of 90% acetone solution, covering the plug cap, oscillating for a moment, and placing the filter membrane in a refrigerator at 4 ℃ in a dark place for soaking for 2 hours, wherein the oscillation is needed for 3 times in the soaking process. The tube was centrifuged at 3500rpm and 4 ℃ for 15 min. And pouring the centrifuged supernatant into a 1cm cuvette, and measuring the absorbance values at the wavelengths of 630nm, 647nm, 664nm and 750nm by taking 90% acetone as a reference.
The calculation formula is as follows:
ρChl-a＝[11.85(A664-A750)-1.54(A647-A750)-0.08(A630-A750)]V1/V2L；
the algae dissolving rate is (rho 1-rho 2)/rho 1 multiplied by 100 percent;
the algae inhibition rate is (rho 3-rho 2)/rho 3 multiplied by 100%.
In the formula:
rho Chl-a-chlorophyll a mass concentration, mu g/L;
a630-absorbance value of the extract at wavelength 630;
a647 — absorbance values of the extract at a wavelength 647;
a664 — absorbance value of the extract at wavelength 664;
a750-absorbance value of the extract at wavelength 750;
v1-volume of extract, 10 mL;
v2 — water sample volume, L;
l-optical path of cuvette, 1 cm;
rho 1-initial chlorophyll a content of the sample, mu g/L;
rho 2-chlorophyll a content of the sample on the day, mu g/L;
rho 3-chlorophyll a content on the day of control, mu g/L.
Specifically, the preparation method of the culture solution of the basket algae comprises the following steps:
adding 5-20% of Schistosoma scoparia into BG11 culture medium, and culturing at 25-35 deg.C under the condition of light intensity of 1600-.
Preferably, the basket algae is inoculated in BG11 culture medium at 8-15% and cultured for 3 days at 28-32 deg.C and under the condition of light intensity of 1800-2100 lux.
More preferably, the basket algae is inoculated into BG11 culture medium at 10% and cultured for 4 days at 30 deg.C under illumination intensity of 2000 lux.
A method of preparing a nutrient broth culture liquid medium, comprising: weighing 10g of peptone, 3g of beef extract powder and 5g of sodium chloride, adding 1000mL of distilled water, stirring for dissolving, adjusting the pH value to 7.2, and sterilizing at 121 ℃ for 20min in an autoclave.
A method for preparing a nutrient broth culture solid medium comprises the following steps: weighing 10g of peptone, 3g of beef extract powder, 5g of sodium chloride and 20g of agar powder, adding 1000mL of distilled water, stirring for dissolving, adjusting the pH value to 7.2, and sterilizing at 121 ℃ for 20min in an autoclave.
The preparation method of the BG11 culture medium comprises the following steps: weighing NaNO3 1.5g、K2HPO4 0.04g、MgSO4·7H2O 0.075g、CaCl2·2H20.036g of O, 0.006g of citric acid, 0.006g of ferric ammonium citrate and EDTA-Na2 0.001g、NaCO30.02g and 1mL of trace element A5 solution are put into a beaker, added with 1000mL of distilled water, stirred and dissolved, then the pH value is adjusted to 7.1, and the mixture is sterilized in an autoclave for 20min at 121 ℃.
The preparation method of the trace element A5 solution comprises the following steps: weighing 2.86g of boric acid and MnCl2·4H2O1.86g，ZnSO4·7H2O 0.22g，Na2MoO4·2H2O 0.39g，CuSO4·5H2O 0.08g，Co(NO3)2·6H2O0.05 g, 1000mL of distilled water was added and dissolved with stirring.
The invention is illustrated by the following specific examples
Example 1
1. Preparation of degradation bacterial liquid
Taking pseudomonas mendocina preserved in a refrigerator at the temperature of-80 ℃, streaking on a nutrient broth solid culture medium plate, and culturing for 12h at the temperature of 30 ℃ until a single colony grows out; inoculating a single colony of pseudomonas mendocina to a nutrient broth liquid culture medium, culturing for 16h to logarithmic phase under the conditions of temperature of 30 ℃ and rotation speed of 200rpm, then transferring to a fresh nutrient broth liquid culture medium according to 1 percent of addition amount, culturing for 12h to logarithmic phase under the conditions of temperature of 30 ℃ and rotation speed of 200rpm to obtain untreated bacterial liquid for later use.
2. Culture solution for preparing basket algae
Inoculating Schizostera marina to BG11 culture medium at 10% addition, culturing at 30 deg.C under 2000lux for 3 days to obtain chlorophyll a content of 652.4 μ g/L, and diluting to obtain chlorophyll a content of 100 μ g/L and pH of 6.5.
3. Dissolving basket algae with degrading bacteria liquid
Adding the untreated bacteria liquid into the culture liquid of the basket algae by adding 0.005%, 0.05% and 10% of the bacteria liquid respectively, setting a blank experiment group without adding the degraded bacteria liquid as a control, culturing for 5 days under the conditions of 30 ℃ and 2000lux of illumination intensity, wherein the light-dark ratio is 12:12, sampling every 24h to measure the content of chlorophyll a in the sample, and performing microscopic examination, wherein the results are shown in fig. 1 and fig. 2.
As can be seen from FIG. 1, when the addition amounts of the degrading bacteria liquid are 10% and 0.05%, the Pseudomonas mendocina has a good algae-dissolving effect, and 71.5% and 61.3% of Schistosoma japonicum are respectively dissolved after five days of adding. When the addition amount is 0.005%, the algae dissolving effect is not obvious, the Schizochytrium can still grow faster in the shake flask, but still has a certain algae inhibiting effect compared with a blank group. Compared with a blank control, the three additive amounts have the algae inhibiting effect, wherein when the additive amounts are 10%, 0.5% and 0.005%, the algae inhibiting rate after five days is 98.8%, 98.3% and 57% respectively. Fig. 2a and 2b are microscopic views, wherein fig. 2a is before adding the degraded bacterial liquid, and fig. 2b is after adding the degraded bacterial liquid. Obviously, after the degradation bacterial liquid is added for 2 days, the basket algae yellowing phenomenon is obvious, and the filament is broken under a microscope, so that the cell structure is damaged.
Example 2
1. Preparation of degradation bacterial liquid
Taking pseudomonas mendocina preserved in a refrigerator at the temperature of-80 ℃, streaking on a nutrient broth solid culture medium plate, and culturing for 12h at the temperature of 30 ℃ until a single colony grows out; inoculating a single pseudomonas mendocina colony to a nutrient broth liquid culture medium, culturing for 16h to logarithmic growth phase under the conditions of the temperature of 30 ℃ and the revolution of 200rpm, then transferring to a fresh nutrient broth liquid culture medium according to 1 percent of addition amount, culturing for 16h to logarithmic growth phase under the conditions of the temperature of 30 ℃ and the revolution of 200rpm to obtain untreated bacterial liquid for later use;
centrifuging the untreated bacteria liquid at the centrifugation revolution of 10000rpm and the temperature of 4 ℃, collecting bacteria, and then resuspending the bacteria by using sterile water to obtain a bacteria weight suspension;
filtering the centrifuged supernatant with a filter membrane with pore diameter of 0.22um for sterilization to obtain sterile supernatant.
2. Culture solution for preparing basket algae
Inoculating Schizostera marina to BG11 culture medium at 10% addition, culturing at 30 deg.C under 2000lux for 4 days to obtain chlorophyll a content of 1661.4 μ g/L, and diluting to obtain chlorophyll a content of 400 μ g/L and pH of 5.5.
3. Dissolving basket algae with degrading bacteria liquid
Adding untreated bacteria liquid, resuspended thallus and sterile supernatant into the culture solution of Schistosoma according to the addition of 0.05%, setting a blank experiment group without adding degraded bacteria liquid as a control, culturing for 5 days under the conditions of 30 ℃ and 2000lux of illumination intensity, wherein the light-dark ratio is 12:12, sampling every 24h to measure the content of chlorophyll a in the sample, and the result is shown in figure 3.
The untreated bacteria liquid and the sterile supernatant have better algae dissolving effect, and after 5 days of adding, the algae dissolving rate reaches 69.7 percent and 62 percent respectively, and the algae inhibiting rate reaches 95.9 percent and 94.9 percent respectively. And the addition of the pseudomonas mendocina cells alone has an insignificant algae dissolving effect and an algae inhibiting rate of 37.7 percent. Thus, the pseudomonas mendocina is mainly dependent on secretion metabolites to achieve the algae dissolving effect. And the problem that the culture medium lacks a carbon source, thalli cannot grow and metabolize, and cannot secrete corresponding metabolites for effective algae lysis is solved by adding a proper carbon source of the pseudomonas mendocina into the BG11 culture medium, wherein the carbon source can be selected from the following components: glucose, sodium acetate, trisodium citrate and/or starch.
Example 3
1. Preparation of degradation bacterial liquid
Taking pseudomonas mendocina preserved in a refrigerator at the temperature of-80 ℃, streaking on a nutrient broth solid culture medium plate, and culturing for 12h at the temperature of 30 ℃ until a single colony grows out; inoculating a single colony of pseudomonas mendocina to a nutrient broth liquid culture medium, culturing for 16h to an exponential phase under the conditions of the temperature of 30 ℃ and the rotation speed of 200rpm, inoculating to a fresh nutrient broth liquid culture medium according to the inoculation amount of 1%, and culturing for 12h to the exponential phase under the conditions of the temperature of 30 ℃ and the rotation speed of 200rpm to obtain untreated bacterial liquid for later use.
2. Culture solution for preparing basket algae
Inoculating Schizostera marina to BG11 culture medium at 10% addition, culturing at 30 deg.C under 2000lux for 3 days to obtain culture medium chlorophyll a content of 1248.5 μ g/L, and diluting the culture medium to obtain chlorophyll a content of 200 μ g/L and pH of 8.5.
3. Dissolving basket algae with degrading bacteria liquid
Adding the untreated bacterial liquid into the culture solution of the basket algae according to the addition amount of 0.05%, setting a blank experiment group without adding the degradation bacterial liquid as a control, culturing for 5 days at the temperature of 15 ℃, 20 ℃, 28 ℃ and 35 ℃ respectively under the illumination intensity of 2000lux and the light-dark ratio of 12:12, sampling every 24 hours to measure the content of chlorophyll a in the sample, and obtaining the result shown in figure 4.
0.05 percent of degradation bacteria liquid is added into the Matricaria algae culture solution, and the high-efficiency algae dissolving and inhibiting effect is achieved when the culture temperature is 15 ℃, 20 ℃, 28 ℃ and 35 ℃. When the culture temperature is 15 ℃, the algae dissolving rate and the algae inhibiting rate are 61.1 percent and 96.1 percent respectively; when the culture temperature is 20 ℃, the algae dissolving rate and the algae inhibiting rate are 63.3 percent and 97.3 percent respectively; when the culture temperature is 28 ℃, the algae dissolving rate and the algae inhibiting rate are 65.4 percent and 98.2 percent respectively; when the culture temperature is 35 ℃, the algae dissolving rate and the algae inhibiting rate are 67.4 percent and 99.3 percent respectively.
Example 4
1. Preparation of degradation bacterial liquid
Taking pseudomonas mendocina preserved in a refrigerator at the temperature of-80 ℃, streaking on a nutrient broth solid culture medium plate, and culturing for 12h at the temperature of 30 ℃ until a single colony grows out; inoculating a single colony of pseudomonas mendocina to a nutrient broth liquid culture medium, culturing for 16h to an exponential phase under the conditions of the temperature of 30 ℃ and the rotation speed of 200rpm, inoculating to a fresh nutrient broth liquid culture medium according to the inoculation amount of 1%, and culturing for 12h to the exponential phase under the conditions of the temperature of 30 ℃ and the rotation speed of 200rpm to obtain untreated bacterial liquid for later use.
2. Culture solution for preparing basket algae
Inoculating Schizostera marina to BG11 culture medium at 10% addition, culturing at 30 deg.C under 2000lux for 3 days to obtain culture medium chlorophyll a content of 1369.5 μ g/L, diluting the culture medium to obtain culture medium chlorophyll a content of 300 μ g/L, and adjusting pH of the culture solution to 5.5, 6.5, 7.5 and 8.5 respectively.
3. Dissolving basket algae with degrading bacteria liquid
Adding the untreated bacterial liquid into the culture solution of the basket algae according to the addition amount of 0.05%, setting a blank experiment group without adding the degradation bacterial liquid as a control, culturing for 5 days at the temperature of 30 ℃ with the illumination intensity of 2000lux and the light-dark ratio of 12:12, sampling every 24h to measure the content of chlorophyll a in the sample, and obtaining the result shown in figure 5.
When 0.05 percent of degradation bacteria liquid is added into the Matricaria algae culture solution, the high-efficiency algae dissolving and inhibiting effect is achieved when the pH value of the Matricaria algae culture solution is 5.5, 6.5, 7.5 and 8.5. When the pH value of the culture solution is 5.5, the algae dissolving rate and the algae inhibiting rate are 61.7 percent and 96.4 percent respectively; when the pH value of the culture solution is 6.5, the algae dissolving rate and the algae inhibiting rate are respectively 62.9 percent and 97.8 percent; when the pH value of the culture solution is 7.5, the algae dissolving rate and the algae inhibiting rate are 65.4 percent and 98.2 percent respectively; when the pH of the culture solution is 8.5, the algae dissolving rate and the algae inhibiting rate are 67.4 percent and 99.3 percent respectively.
Example 5
1. Preparation of degradation bacterial liquid
Taking pseudomonas mendocina preserved in a refrigerator at the temperature of-80 ℃, streaking on a nutrient broth solid culture medium plate, and culturing for 12h at the temperature of 30 ℃ until a single colony grows out; inoculating a single colony of pseudomonas mendocina to a nutrient broth liquid culture medium, culturing for 16h to an exponential phase under the conditions of the temperature of 30 ℃ and the rotation speed of 200rpm, inoculating to a fresh nutrient broth liquid culture medium according to the inoculation amount of 1%, and culturing for 12h to the exponential phase under the conditions of the temperature of 30 ℃ and the rotation speed of 200rpm to obtain untreated bacterial liquid for later use.
2. Culture solution for preparing basket algae
Inoculating Schizostera marina to BG11 culture medium at 10% addition, culturing at 30 deg.C under 2000lux for 7 days to obtain culture medium chlorophyll a content of 2878.4 μ g/L, and diluting the culture medium to obtain chlorophyll a contents of 100, 400, 700 and 1000 μ g/L, and pH of 7.5.
3. Dissolving basket algae with degrading bacteria liquid
Adding the untreated bacterial liquid into the culture solution of the basket algae according to the addition amount of 0.05%, setting a blank experiment group without adding the degradation bacterial liquid as a control, culturing for 5 days at the temperature of 30 ℃ with the illumination intensity of 2000lux and the light-dark ratio of 12:12, sampling every 24h to measure the content of chlorophyll a in the sample, and obtaining the result shown in figure 6.
When 0.05 percent of degradation bacteria liquid is added into the Matricaria algae culture solution, the initial chlorophyll a content is 100, 400, 700 and 1000 mug/L, and the high-efficiency algae dissolving and inhibiting effect is achieved. When the initial chlorophyll a content is 100 mug/L, the algae dissolving rate and the algae inhibiting rate are 61.9 percent and 95.2 percent respectively; when the initial chlorophyll a content is 400 mug/L, the algae dissolving rate and the algae inhibiting rate are respectively 63.5 percent and 96.4 percent; when the initial chlorophyll a content is 700 mug/L, the algae dissolving rate and the algae inhibiting rate are respectively 68.4 percent and 99.7 percent; when the initial chlorophyll a content is 1000 mug/L, the algae dissolving rate and the algae inhibiting rate are 66.7 percent and 99.1 percent respectively.
According to the statistical results of the algae-lysing effects obtained in the examples 1-5, when the adding amount of the pseudomonas mendocina bacterial liquid is more than or equal to 0.05%, the chlorophyll a content of algae cells is reduced by more than 95% compared with that of a control group after the degrading bacterial liquid is added in all the examples for 5 days, and is reduced by more than 60% compared with that before the degrading bacterial liquid is added. From the above, the degradation bacterial liquid can realize high-efficiency algae dissolution under the conditions of different initial algae concentrations, temperatures and pH values.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (9)
1. A method of degrading basket algae, comprising: inoculating 0.05-10% of degrading bacteria liquid into culture liquid of Schizochytrium, and co-culturing at 15-35 ℃, pH 5-8.5 and illumination intensity 1600-2300lux, wherein the degrading bacteria liquid is prepared from Pseudomonas mendocina (Pseudomonas mendocina), the Pseudomonas mendocina is preserved in Guangdong province microorganism strain preservation center 12-8.2017, and the biological preservation number is: GDMCC 60297;
the degraded bacterial liquid at least comprises one of untreated bacterial liquid and sterile supernatant.
2. The method for degrading basket algae according to claim 1, wherein the degrading bacterial solution further comprises a bacterial body weight suspension.
3. The method for degrading basket algae according to claim 1 or 2, wherein the method for preparing the degrading bacterial liquid comprises the following steps:
(1) taking pseudomonas mendocina preserved in a refrigerator, streaking on a nutrient broth solid culture medium plate, and culturing at 26-33 ℃ for 10-16h until a single colony grows out;
(2) inoculating a single colony of pseudomonas mendocina to a nutrient broth liquid culture medium, culturing for 10-16h under the conditions that the temperature is 26-33 ℃ and the revolution is 150-250rpm to reach the logarithmic growth phase, transferring to a fresh nutrient broth liquid culture medium according to the addition amount of 0.5-2%, and continuously culturing to the logarithmic growth phase according to the conditions to obtain untreated bacterial liquid;
(3) centrifuging the untreated bacteria liquid, collecting the centrifuged bacteria, and resuspending the bacteria with sterile water to obtain a bacteria weight suspension;
(4) centrifuging the untreated bacteria liquid, collecting the centrifuged supernatant, and filtering the supernatant by using a filter membrane with the pore diameter of less than 0.5 mu m to obtain the sterile supernatant.
4. The method for degrading basket algae according to claim 3, wherein the centrifugation rotation is 8000-15000rpm and the temperature is 1-10 ℃.
5. A method for degrading basket algae as claimed in claim 3, wherein the pore size of the filter membrane is less than 0.3 μm.
6. The method for degrading basket algae according to claim 1, wherein the preparation method of the culture solution of basket algae comprises: the basket algae is inoculated in BG11 culture medium according to the addition of 5-20%, and cultured to logarithmic phase under the conditions of temperature of 15-35 ℃ and illumination intensity of 1600-.
7. The method for degrading basket algae of claim 1, wherein 700-1500mg/L carbon source is added to the culture solution of basket algae.
8. The method for degrading basket algae according to claim 7, wherein the carbon source is one or more of glucose, sodium acetate, trisodium citrate and starch.
9. The method for degrading basket algae according to claim 1, wherein the culture conditions for inoculating the degradation bacteria solution to the culture solution of basket algae are as follows: the pH value is 5.5-8.5, and the temperature is 20-35 ℃.
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