CN115872471A - Method for treating water eutrophication by using algae-based biochar loaded nano zero-valent iron - Google Patents
Method for treating water eutrophication by using algae-based biochar loaded nano zero-valent iron Download PDFInfo
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- 241000195493 Cryptophyta Species 0.000 title claims abstract description 58
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- 238000000034 method Methods 0.000 title claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000012851 eutrophication Methods 0.000 title claims abstract description 16
- 241000192710 Microcystis aeruginosa Species 0.000 claims abstract description 27
- 241000192700 Cyanobacteria Species 0.000 claims abstract description 21
- 230000004913 activation Effects 0.000 claims description 10
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- 238000003763 carbonization Methods 0.000 claims description 5
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
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- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- SRUWWOSWHXIIIA-UKPGNTDSSA-N Cyanoginosin Chemical compound N1C(=O)[C@H](CCCN=C(N)N)NC(=O)[C@@H](C)[C@H](C(O)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](C)NC(=O)C(=C)N(C)C(=O)CC[C@H](C(O)=O)N(C)C(=O)[C@@H](C)[C@@H]1\C=C\C(\C)=C\[C@H](C)[C@@H](O)CC1=CC=CC=C1 SRUWWOSWHXIIIA-UKPGNTDSSA-N 0.000 abstract description 4
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Abstract
The invention relates to the technical field of sewage treatment, in particular to a method for treating water eutrophication by using algae-based biochar loaded with nano zero-valent iron; preparing blue algae-based biochar by using microcystis aeruginosa; preparing nZVI-loaded cyanobacteria-based biochar based on the cyanobacteria-based biochar; the method uses the cyanobacteria-based biochar loaded by the nZVI as a carrier for fixing the nZVI, effectively improves the dispersion of the nZVI, removes microcystin by using the physical action of the nZVI, reduces the occurrence of secondary pollution after algae dissolution, thereby improving the stability and safety of the algae control system, and on the other hand, the nZVI not only can have a certain removal effect on algae and the microcystin, but also can effectively degrade various pollutants adsorbed on the cyanobacteria-based biochar, improve the renewable utilization of the cyanobacteria-based biochar, prolong the service life of the cyanobacteria-based biochar, thereby enhancing the high efficiency and the continuity of the algae control system.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for treating water eutrophication by using algae-based biochar loaded with nano zero-valent iron.
Background
The existing blue algae removal method is mainly divided into a physical method and a chemical method.
Common physical methods comprise fishing, membrane separation, ultraviolet, air flotation, ultrasonic waves and the like, the operation is simple, the harm to the environment is small, but the equipment operation cost and the labor cost are high, the method is suitable for the water body with large-area blue algae outbreak, and the application has certain limitation.
The chemical method is a mode of adding a chemical agent into a water body to kill algae cells or make the algae cells gather together to flocculate and settle so as to inhibit the photosynthesis of the algae cells, comprises an oxidation technology and a photocatalysis technology, has the advantages of good algae killing effect, quick response, wide applicability, simple operation and the like, is suitable for lakes with serious eutrophication, but is easy to cause secondary pollution and has negative influence on the ecological environment.
Therefore, aiming at the problems of unstable algae dissolving effect and secondary pollution caused by the current algae control technology, the efficient, stable and safe algae control technology is explored and developed, not only meets the requirement of ecological civilization construction in China, but also has very important function for promoting the effective solution of the cyanobacterial bloom problem in China.
Disclosure of Invention
The invention aims to provide a method for treating water eutrophication by using algae-based charcoal loaded with nano zero-valent iron, and aims to research a novel algae removal method for stably removing cyanobacterial bloom and preventing secondary pollution.
In order to realize the aim, the invention provides a method for treating water eutrophication by using algae-based biochar loaded with nano zero-valent iron, which comprises the following steps:
preparing blue algae-based biochar by using microcystis aeruginosa;
preparing nZVI-loaded cyanobacteria-based biochar based on the cyanobacteria-based biochar;
and (3) utilizing the nZVI loaded cyanobacteria-based biochar to strengthen algae removal.
The specific mode for preparing the cyanobacterial-based biochar by using the microcystis aeruginosa comprises the following steps:
air-drying the cultured microcystis aeruginosa, washing with ionized water to remove impurities, and then carrying out drying treatment to obtain the impurity-removed microcystis aeruginosa;
and grinding the impurity-removed microcystis aeruginosa, and performing carbonization and activation treatment to obtain the blue algae-based biochar.
Wherein the drying treatment temperature is 100 ℃, and the drying treatment time is 24h.
Wherein the activation temperature is 500 ℃, and the activation time is 2h.
Wherein the reagent for preparing the nZVI-loaded cyanobacteria-based biochar comprises FeSO 4 ·7H 2 O solution, naBH 4 Solution, oxygen-free pure water and absolute ethyl alcohol.
The invention relates to a method for treating water eutrophication by using algae-based biochar loaded with nano zero-valent iron, which comprises the steps of preparing blue algae-based biochar by using microcystis aeruginosa; preparing nZVI-loaded blue algae-based biochar based on the blue algae-based biochar; the method uses the cyanobacteria-based biochar loaded by the nZVI as a carrier for fixing the nZVI, effectively improves the dispersion of the nZVI, removes microcystin by using the physical action of the nZVI, reduces the occurrence of secondary pollution after algae dissolution, thereby improving the stability and safety of the algae control system, and on the other hand, the nZVI not only can have a certain removal effect on algae and the microcystin, but also can effectively degrade various pollutants adsorbed on the cyanobacteria-based biochar, improve the renewable utilization of the cyanobacteria-based biochar, prolong the service life of the cyanobacteria-based biochar, thereby enhancing the high efficiency and the continuity of the algae control system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a cyanobacteria-based biomass charcoal-loaded nanoscale zero-valent iron algae control system.
FIG. 2 is a schematic diagram of a CBC/nZVI experimental reaction apparatus.
FIG. 3 is a cyanobacterial-based biochar/nZVISE diagram.
FIG. 4 is a flow chart of a method for treating water eutrophication by using algae-based charcoal loaded with nano zero-valent iron.
FIG. 5 is a flow chart of a specific way of preparing cyanobacterial-based biochar by using microcystis aeruginosa.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1 to 5, the invention provides a method for treating water eutrophication by using algae-based biochar loaded with nano zero-valent iron, which comprises the following steps:
s1, preparing blue algae-based biochar by using microcystis aeruginosa;
specifically, the microcystis aeruginosa is cultured by adopting a BG11 culture medium, and the formula of the culture medium is provided by the algal culture collection center of the institute of aquatic organisms of the academy of sciences of China. The culture conditions are as follows: temperature (25 +/-1) ° C, light intensity of 2000 lx-2500 lx, light-dark ratio of 12h, static culture, regularly shaking 3 times every day. Transplanting every 96h for 1 time, repeating for more than 3 times, and making the growth stages of Microcystis aeruginosa in the same culture medium converge.
The microcystis aeruginosa colony quilt has uniform texture, no layering, no color, transparency and obvious appearance, but the edge part is highly hydrated. The cells are spherical, nearly spherical and have the diameter of 3-7 mu m. The cells in the population are uniformly and closely distributed. Protoplasts are grayish green, bluish green, brilliant green and grayish brown, and the intracellular contents often have countless pseudo-vacuoles in the form of granular bubbles.
The specific mode is as follows:
s11, air-drying the cultured microcystis aeruginosa, washing with ionized water to remove impurities, and then carrying out drying treatment to obtain the impurity-removed microcystis aeruginosa;
specifically, the cultured microcystis aeruginosa is naturally dried for 5 days, washed by deionized water to remove surface impurities, and dried in a drying oven at 100 ℃ for 24 hours to obtain the impurity-removed microcystis aeruginosa.
S12, grinding the impurity-removed microcystis aeruginosa, and performing carbonization and activation treatment to obtain the blue algae-based biochar.
Specifically, screening the mixture to 2mm particles by a grinder, introducing water vapor by using a vacuum tube type carbonization furnace, preparing the blue algae-based biochar by adopting a one-step carbonization and activation method at the activation temperature of 500 ℃, the activation time of 2h, the water vapor flow of 1g/min and the heating rate of 5 ℃/min, and drying for later use to obtain the blue algae-based biochar (CBC).
S2, preparing nZVI-loaded blue algae-based biochar based on the blue algae-based biochar;
specifically, feSO is prepared 4 ·7H 2 O solution, adding the O solution into a 1000mL three-neck flask, adding the prepared CBC, and introducing N 2 Put into a low-temperature cooling circulating pumpAnd keeping the temperature constant at 5 ℃ for stirring, pouring the prepared NaBH4 solution into a constant-pressure separating funnel, slowly and dropwise adding the solution into a three-neck flask, stirring and reacting for 4 hours, taking out a product, sequentially washing the product with oxygen-free pure water and absolute ethyl alcohol for three times respectively to prepare the algae-based biochar/nZVI, putting the algae-based biochar/nZVI into a vacuum drying oven at 60 ℃, and preserving for later use to obtain the blue algae-based biochar (CBC/nZVI) loaded with the nZVI.
S3, utilizing the nZVI loaded cyanobacteria-based biochar to strengthen algae removal.
Specifically, the blue algae in the eutrophic water body is removed in an enhanced manner by utilizing the nZVI-loaded blue algae-based biochar.
The microcystis aeruginosa is taken as a research object, and the influence of self factors and environmental factors on the algae dissolving effect is examined.
Examples
In the cyanobacteria-based biochar/nZVI, the concentration of nZVI is 15mg, the concentration of microcystis aeruginosa is 250ug/l, the hydraulic retention time is 12h, the pH value of inlet water is 8, the dissolved oxygen is 4mg, the temperature is 20 ℃, the proportion of completely normal algae cells in the system is only 8.7 percent, the proportion of algae cells which have chlorophyll fluorescence and can be dyed by PI is 5.5 percent, and the total proportion of the surviving algae cells is only 15.6 percent; the proportion of dead cells of PI microcystis aeruginosa combined with damaged membranes is 2.5%, the proportion of cells which are free from chlorophyll fluorescence and have no pollution to PI due to damage of nucleic acid substances is 81.9%, and the proportion of dead microcystis aeruginosa cells or severely damaged microcystis aeruginosa cells is as high as 84.4%.
Although the above disclosed embodiments are only preferred embodiments of the method for treating eutrophication water by using nano zero-valent iron loaded on the algae-based biochar, the scope of the present invention should not be limited thereby, and persons skilled in the art can understand that all or part of the processes of the above embodiments can be implemented and equivalent variations according to the claims of the present invention are still within the scope of the present invention.
Claims (5)
1. A method for treating water eutrophication by using algae-based charcoal loaded with nano zero-valent iron is characterized by comprising the following steps:
blue algae-based biochar is prepared by using microcystis aeruginosa;
preparing nZVI-loaded cyanobacteria-based biochar based on the cyanobacteria-based biochar;
and (3) utilizing the nZVI loaded cyanobacteria-based biochar to strengthen algae removal.
2. The method of claim 1, wherein the eutrophication of water body is treated by the algae-based charcoal loaded with nanoscale zero-valent iron,
the specific mode for preparing the cyanobacterial-based biochar by using the microcystis aeruginosa comprises the following steps:
air-drying the cultured microcystis aeruginosa, washing with ionized water to remove impurities, and then carrying out drying treatment to obtain the impurity-removed microcystis aeruginosa;
and grinding the impurity-removed microcystis aeruginosa, and performing carbonization and activation treatment to obtain the cyanobacteria-based biochar.
3. The method for treating water eutrophication by using the algae-based charcoal loaded with nanoscale zero-valent iron according to claim 2,
the drying treatment temperature is 100 ℃, and the drying treatment time is 24h.
4. The method of claim 2, wherein the algae-based charcoal-loaded nanoscale zero-valent iron is used for treating water eutrophication,
the activation temperature is 500 ℃, and the activation time is 2h.
5. The method for treating eutrophication water body by using algae-based charcoal loaded with nanoscale zero-valent iron, according to claim,
the reagent for preparing the nZVI-loaded blue algae-based biochar comprises FeSO 4 ·7H 2 O solution, naBH 4 Solution, oxygen-free pure water and absolute ethyl alcohol.
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|---|---|---|---|---|
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-
2022
- 2022-12-16 CN CN202211628138.7A patent/CN115872471A/en active Pending
Patent Citations (8)
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| WO2012019570A2 (en) * | 2010-08-11 | 2012-02-16 | Univerzita Palackého v Olomouci | Use of ultra-small iron particles for removal, prevention, and reduction of mass expansion of cyanobacteria water blooms |
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