CN112408645B - Microalgae cultivation wastewater recycling method - Google Patents
Microalgae cultivation wastewater recycling method Download PDFInfo
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- CN112408645B CN112408645B CN202011313419.4A CN202011313419A CN112408645B CN 112408645 B CN112408645 B CN 112408645B CN 202011313419 A CN202011313419 A CN 202011313419A CN 112408645 B CN112408645 B CN 112408645B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a microalgae cultivation wastewater recycling method, which comprises the following steps: the microalgae cultivation wastewater is treated by centrifugal filtration, multi-layer screen filtration and an aeration tank, and then is subjected to vacuum filtration, so that the purpose of recycling the microalgae cultivation wastewater is achieved. The method reduces the energy consumption of the microalgae water recovery process, has the advantages of no chemical use and no residue in the whole process, reduces the algae powder impurities, improves the algae powder quality, has high treatment speed, is energy-saving and environment-friendly, can continuously operate, has large treatment capacity, can be applied to microalgae industry, has low energy consumption and high efficiency, can effectively reduce the recycling treatment cost of microalgae cultivation wastewater, and is suitable for industrial use.
Description
Technical Field
The invention belongs to the technical field of microalgae cultivation, and particularly relates to a microalgae cultivation wastewater recycling method.
Background
Microalgae are those microscopic populations of microscopic algae whose morphology can only be discerned. Microalgae are generally a general term for microorganisms that contain chlorophyll-a and are capable of photosynthesis, and belong to one species of protozoa. Microalgae cultivated or produced in large quantities by biotechnology belong to 4 phylum: cyanobacteria, chlorophyta, chrysophyta, and Rhodophyta. Microalgae cultivation industry is an industry with large water consumption and large fertilizer demand, and plays a role in energy conversion and carbon circulation contribution.
Microalgae are cryptogamic plants with chlorophyll and photoautotrophic capability and without root, stem and leaf differentiation, belong to lower spore plants, are tiny in individuals, strong in viability and rapid in propagation speed, are easy to culture, and are widely applied to sewage treatment. Compared with the traditional sewage treatment method, the microalgae can enhance the removal of nutrient substances, organic pollutants, heavy metals and pathogens in sewage, can resist certain toxic substances, has a very wide range of treatable sewage, and is a novel green technology with high efficiency and low cost. The microalgae not only can purify sewage, but also can further prepare biofuel and high added value products such as food, health care products, cosmetics and the like after harvesting, has no secondary pollution and simple and convenient operation, and is currently becoming an important research direction in sewage treatment, for example: patent application CN202010088372.X discloses a method for algae treatment of aquaculture wastewater; patent application CN201810266297.4 discloses a method for treating monascus fermentation wastewater and co-producing microalgae protein feed by using microalgae; patent application CN201810058708.0 discloses a method for treating aquaculture wastewater by immobilized algae cells; patent application CN201711327965.1 discloses a device for treating pig farm cultivation wastewater by utilizing microalgae and producing algae powder and a process thereof; patent application CN201510940555.9 discloses a livestock and poultry wastewater treatment process.
At present, the microalgae cultivation technology is mainly applied to the aspects of carbon fixation and pollution control, biomass energy, food, medicine, feed and other high-added-value product preparation, but a plurality of technical bottlenecks still remain to be solved, wherein the microalgae cultivation industry needs larger water consumption and fertilizer consumption, the required wastewater treatment capacity is also larger, and the factors limit the development of the microalgae cultivation industry.
At present, the conventional method for treating microalgae cultivation wastewater is not limited to a chemical treatment method and a biological treatment method, and is generally a chemical treatment method: high molecular polymer or Al 2 (SO 4 ) 3 ·18H 2 Precipitating complex salt metal ions such as O and potassium sulfate, and floating by adjusting pH with polymer compound; general biological treatment method: adding fast-growing bacteria such as quick-acting bacteria and bacillus subtilis, and processing. However, the existing chemical treatment method and biological treatment method have large water consumption. The biological treatment method has slow aging and the microalgae cultivation wastewater has the particularity, so that the treatment is frequently failed, the time-consuming treatment is required to be carried out on a large site, and the implementation is difficult; chemical treatment method, large amount of required chemicals and expenseHigh cost of equipment, waste of water and huge waste, and the development of microalgae cultivation industry is caused.
Therefore, the finding of a microalgae wastewater recovery method with low energy consumption and high efficiency is urgent in the current microalgae industry with the greatest contribution to environmental protection.
Disclosure of Invention
The invention provides a microalgae cultivation wastewater recycling method for solving the technical problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a microalgae cultivation wastewater recycling method comprises the following steps: after the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer screening filtration, aeration tank treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, and the method specifically comprises the following steps of:
(1) Centrifugally filtering the microalgae cultivation wastewater to obtain filtrate A and filter residue A;
(2) Sending the filtrate A into a multi-layer mesh flushing device for multi-layer screening and filtering to obtain filtrate B and filter residue B;
(3) Delivering the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and delivering the filtrate B into a multi-layer mesh flushing device for multi-layer mesh filtration to obtain filtrate C and filter residue C;
(4) And sending the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae cultivation, and the purpose of recycling microalgae cultivation wastewater is achieved.
Further, the filter residue A is algae mud.
Further, a drain outlet is arranged at the bottom of the aeration tank, and dead microorganisms are periodically discharged from the drain outlet.
Further, the multi-layer screen filtration is carried out by using 500-550 meshes, 600-650 meshes and 800-850 meshes in sequence.
Further, the high-concentration gas dissolving treatment is to send the filtrate B into an aeration tank filled with high-concentration gas, so that the materials react to achieve the effect of dissolving and separating.
Further, the methodThe high concentration gas is CO, O 2 、O 3 、CO 2 。
Further, the concentration of the CO is 10-20 ppm; the O is 2 The concentration of (2) is 40-50 ppm; the O is 3 The concentration of (2) is 10-20 ppm; the CO 2 The concentration of (2) is 2000-3000 ppm.
Further, the vacuum degree of the vacuum filtration is-0.04 to-0.06 MPa, the filter screen is 1200-1500 meshes, and the power of the vacuum machine is 43-47 Kw.
Further, mixing the filter residue B, the filter residue C and the filter residue D of the collected microbial residues, and fermenting to prepare the organic fertilizer.
The multi-layer screen filter filters out some agglomerated microorganisms, and because the filtering engineering is the most energy-saving technology of the engineering, the finer the mesh is, the better the mesh is, but too long the mesh can cause the continuous operation of the filtering time, so the mesh can achieve the best effect only by selecting 500-550 meshes, 600-650 meshes and 800-850 meshes.
In order to avoid the escape of nitrogen fertilizer and the damage of a sterilizing pond to the condition of the culture of the recovered algae, the high-concentration gas is preferably sequenced into CO and O 2 、O 3 、CO 2 The method comprises the steps of carrying out a first treatment on the surface of the The method comprises the steps of killing protozoa quickly by using CO and then using O 2 Reducing anaerobic bacteria, reducing bacterial load, and using O 3 Disinfection (consumption of O due to reduced bacterial load) 3 The amount of energy is also reduced), and finally CO is adopted 2 Residual O 3 Is driven out to avoid residual O 3 Prevents algae cultivation and CO 2 Can also provide carbon source for algae and reduce the pH value of the recovered water.
Introducing O 2 Can reduce BOD and anaerobic microorganism, and introduce O 3 Has bactericidal effect, and can kill protozoa, provide C source and drive away O by introducing CO 3 Gas is introduced into CO 2 Can provide a C source and reduce the recovery pH value.
As the high-concentration gas dissolving process is bubble-free, the filter layer is separated by Shen Caode when the microorganisms die, and the dead microorganisms are prevented from floating upwards to pollute the water. The high-concentration gas device achieves the aim of reutilizing water resources and fertilizer in a physical mode.
The aeration tank is provided with different high-concentration gas devices at the head and tail ends so as to be beneficial to effectively dissolving gas in water.
The multi-layer net flushing device is all arranged in the liquid spraying direction, and liquid is sprayed from inside to outside so as to prevent the net from being plugged.
Because the invention adopts the technical proposal, the invention has the following beneficial effects:
(1) After the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer screening filtration, air explosion pool treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, the problem of microalgae wastewater is solved, waste soil generated by 1 kg of algae powder of chlorella generally needs to be chemically treated for about 20 yuan, spirulina is changed once only in one season, backwater cannot be kept in a dry state, so that the difficulty and yield of cultivation are affected, the quality is more easily polluted and impurity is more, the cost of algae powder can be saved by more than about 10 yuan (per kg of algae powder, and especially the effect is more remarkable when the cultivation area is larger).
(2) The method reduces the energy consumption of the microalgae water recovery process, has the advantages of no chemical use and no residue in the whole process, reduces the algae powder impurities, improves the algae powder quality, has high treatment speed, is energy-saving and environment-friendly, can continuously operate, has large treatment capacity, can be applied to microalgae industry, has low energy consumption and high efficiency, can effectively reduce the recycling treatment cost of microalgae cultivation wastewater, and is suitable for industrial use.
Drawings
For a clearer description of an example of the invention or of a technical solution in the prior art, the drawings required in the description of the embodiment or of the prior art will be briefly described, it being obvious that the drawings in the description below are only some examples of the invention, from which, without the inventive development, other drawings can be obtained for a person skilled in the art:
FIG. 1 is a flow chart of a microalgae cultivation wastewater recycling process.
Detailed Description
The following detailed description of the invention is provided in further detail, but the invention is not limited to these embodiments, any modifications or substitutions in the basic spirit of the present examples, which still fall within the scope of the invention as claimed.
Example 1
A microalgae cultivation wastewater recycling method comprises the following steps: after the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer screening filtration, aeration tank treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, and the method specifically comprises the following steps of:
(1) Centrifugally filtering the microalgae cultivation wastewater to obtain filtrate A and filter residue A;
(2) Sending the filtrate A into a multi-layer mesh flushing device for multi-layer screening and filtering to obtain filtrate B and filter residue B;
(3) Delivering the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and delivering the filtrate B into a multi-layer mesh flushing device for multi-layer mesh filtration to obtain filtrate C and filter residue C;
(4) And sending the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae cultivation, and the purpose of recycling microalgae cultivation wastewater is achieved.
Further, the filter residue A is algae mud; a sewage outlet is formed in the bottom of the aeration tank, and dead microorganisms are regularly discharged from the sewage outlet; the multi-layer screen filtration is carried out by using 500-mesh, 600-mesh and 800-mesh screens in sequence; the high-concentration gas dissolving treatment is to send filtrate B into an aeration tank filled with high-concentration gas, so that materials react to achieve the effect of dissolving and separating; the high concentration gas is CO, O 2 、O 3 、CO 2 And the high concentration gas is in accordance with CO and O 2 、O 3 、CO 2 Sequentially introducing the sewage into an aeration tank; the concentration of CO was 10ppm, O 2 Is 40ppm, said O 3 Is 10ppm, the CO 2 Is 2000ppm; the vacuum degree of the vacuum filtration is-0.04 MPa, the filter screen is 1200 meshes, and the power of the vacuum machine is 43Kw; mixing the filter residue B, the filter residue C and the filter residue D which are used for collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 2
A microalgae cultivation wastewater recycling method comprises the following steps: after the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer screening filtration, aeration tank treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, and the method specifically comprises the following steps of:
(1) Centrifugally filtering the microalgae cultivation wastewater to obtain filtrate A and filter residue A;
(2) Sending the filtrate A into a multi-layer mesh flushing device for multi-layer screening and filtering to obtain filtrate B and filter residue B;
(3) Delivering the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and delivering the filtrate B into a multi-layer mesh flushing device for multi-layer mesh filtration to obtain filtrate C and filter residue C;
(4) And sending the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae cultivation, and the purpose of recycling microalgae cultivation wastewater is achieved.
Further, the filter residue A is algae mud; a sewage outlet is formed in the bottom of the aeration tank, and dead microorganisms are regularly discharged from the sewage outlet; the multi-layer screen filtration is carried out by using 550 mesh, 650 mesh and 850 mesh screens in sequence; the high-concentration gas dissolving treatment is to send filtrate B into an aeration tank filled with high-concentration gas, so that materials react to achieve the effect of dissolving and separating; the high concentration gas is CO, O 2 、O 3 、CO 2 And the high concentration gas is in accordance with O 2 、CO、O 3 、CO 2 Sequentially introducing the sewage into an aeration tank; the concentration of CO was 20ppm, O 2 Is 50ppm, said O 3 Is 20ppm, the CO 2 Is 3000ppm; the vacuum degree of the vacuum filtration is-0.06 MPa, the filter screen is 1500 meshes, and the power of the vacuum machine is 47Kw; mixing the filter residue B, the filter residue C and the filter residue D which are used for collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 3
A microalgae cultivation wastewater recycling method comprises the following steps: after the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer screening filtration, aeration tank treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, and the method specifically comprises the following steps of:
(1) Centrifugally filtering the microalgae cultivation wastewater to obtain filtrate A and filter residue A;
(2) Sending the filtrate A into a multi-layer mesh flushing device for multi-layer screening and filtering to obtain filtrate B and filter residue B;
(3) Delivering the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and delivering the filtrate B into a multi-layer mesh flushing device for multi-layer mesh filtration to obtain filtrate C and filter residue C;
(4) And sending the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae cultivation, and the purpose of recycling microalgae cultivation wastewater is achieved.
Further, the filter residue A is algae mud; a sewage outlet is formed in the bottom of the aeration tank, and dead microorganisms are regularly discharged from the sewage outlet; the multi-layer screen filtration is carried out by using 510-mesh, 610-mesh and 810-mesh screens in sequence; the high-concentration gas dissolving treatment is to send filtrate B into an aeration tank filled with high-concentration gas, so that materials react to achieve the effect of dissolving and separating; the high concentration gas is CO, O 2 、O 3 、CO 2 And the high concentration gas is in accordance with CO and O 2 、O 3 、CO 2 Sequentially introducing the sewage into an aeration tank; the concentration of CO was 12ppm, O 2 Is 42ppm, said O 3 Is 13ppm, the CO 2 Is 2300ppm; the vacuum degree of the vacuum filtration is-0.045 MPa, the filter screen is 1300 meshes, and the power of the vacuum machine is 44Kw; mixing the filter residue B, the filter residue C and the filter residue D which are used for collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 4
A microalgae cultivation wastewater recycling method comprises the following steps: after the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer screening filtration, aeration tank treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, and the method specifically comprises the following steps of:
(1) Centrifugally filtering the microalgae cultivation wastewater to obtain filtrate A and filter residue A;
(2) Sending the filtrate A into a multi-layer mesh flushing device for multi-layer screening and filtering to obtain filtrate B and filter residue B;
(3) Delivering the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and delivering the filtrate B into a multi-layer mesh flushing device for multi-layer mesh filtration to obtain filtrate C and filter residue C;
(4) And sending the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae cultivation, and the purpose of recycling microalgae cultivation wastewater is achieved.
Further, the filter residue A is algae mud; a sewage outlet is formed in the bottom of the aeration tank, and dead microorganisms are regularly discharged from the sewage outlet; the multi-layer screen filtration is carried out by using screens with 540 meshes, 640 meshes and 840 meshes in sequence; the high-concentration gas dissolving treatment is to send filtrate B into an aeration tank filled with high-concentration gas, so that materials react to achieve the effect of dissolving and separating; the high concentration gas is CO, O 2 、O 3 、CO 2 And the high concentration gas is in accordance with CO and O 2 、O 3 、CO 2 Sequentially introducing the sewage into an aeration tank; the concentration of CO was 18ppm, O 2 Is 47ppm of the concentration of O 3 Is 18ppm, the CO 2 Is 2800ppm; the vacuum degree of the vacuum filtration is-0.055 MPa, the filter screen is 1400 meshes, and the power of the vacuum machine is 46Kw; mixing the filter residue B, the filter residue C and the filter residue D which are used for collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 5
A microalgae cultivation wastewater recycling method comprises the following steps: after the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer screening filtration, aeration tank treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, and the method specifically comprises the following steps of:
(1) Centrifugally filtering the microalgae cultivation wastewater to obtain filtrate A and filter residue A;
(2) Sending the filtrate A into a multi-layer mesh flushing device for multi-layer screening and filtering to obtain filtrate B and filter residue B;
(3) Delivering the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and delivering the filtrate B into a multi-layer mesh flushing device for multi-layer mesh filtration to obtain filtrate C and filter residue C;
(4) And sending the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae cultivation, and the purpose of recycling microalgae cultivation wastewater is achieved.
Further, the filter residue A is algae mud; a sewage outlet is formed in the bottom of the aeration tank, and dead microorganisms are regularly discharged from the sewage outlet; the multi-layer screen filtration is carried out by using 530 mesh, 630 mesh and 820 mesh screens in sequence; the high-concentration gas dissolving treatment is to send filtrate B into an aeration tank filled with high-concentration gas, so that materials react to achieve the effect of dissolving and separating; the high concentration gas is CO, O 2 、O 3 、CO 2 And the high concentration gas is in accordance with CO and O 2 、O 3 、CO 2 Sequentially introducing the sewage into an aeration tank; the concentration of CO was 15ppm, O 2 Is 45ppm, said O 3 Is 15ppm, the CO 2 Is 2500ppm; the vacuum degree of the vacuum filtration is-0.05 MPa, the filter screen is 1350 meshes, and the power of the vacuum machine is 45Kw; mixing the filter residue B, the filter residue C and the filter residue D which are used for collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 6
A microalgae cultivation wastewater recycling method comprises the following steps: after the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer screening filtration, aeration tank treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, and the method specifically comprises the following steps of:
(1) Centrifugally filtering the microalgae cultivation wastewater to obtain filtrate A and filter residue A;
(2) Sending the filtrate A into a multi-layer mesh flushing device for multi-layer screening and filtering to obtain filtrate B and filter residue B;
(3) Delivering the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and delivering the filtrate B into a multi-layer mesh flushing device for multi-layer mesh filtration to obtain filtrate C and filter residue C;
(4) And sending the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae cultivation, and the purpose of recycling microalgae cultivation wastewater is achieved.
Further, the filter residue A is algae mud; a sewage outlet is formed in the bottom of the aeration tank, and dead microorganisms are regularly discharged from the sewage outlet; the multi-layer screen filtration is carried out by sequentially using 520-mesh, 620-mesh and 830-mesh screens; the high-concentration gas dissolving treatment is to send filtrate B into an aeration tank filled with high-concentration gas, so that materials react to achieve the effect of dissolving and separating; the high concentration gas is CO, O 2 、O 3 、CO 2 And the high concentration gas is in accordance with CO and O 2 、O 3 、CO 2 Sequentially introducing the sewage into an aeration tank; the concentration of CO was 16ppm, O 2 Is 47ppm of the concentration of O 3 Is 16ppm, the CO 2 Is 2600ppm; the vacuum degree of the vacuum filtration is-0.05 MPa, the filter screen is 1400 meshes, and the power of a vacuum machine is 45Kw; mixing the filter residue B, the filter residue C and the filter residue D which are used for collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Comparative example 1
The difference from example 1 is that: the materials are not sent into an aeration tank to be dissolved in high-concentration gas, and other conditions are unchanged.
Comparative example 2
The difference from example 1 is that: when multi-layer screening is carried out, the screen mesh is 400-450, 700-750, 860-900, and other conditions are unchanged.
Comparative example 3
A microalgae cultivation wastewater recycling method adopts a general chemical treatment method, and comprises the following steps: adding high molecular polymer or Al into microalgae cultivation wastewater 2 (SO 4 ) 3 ·18H 2 The complex salt metal ions such as O, potassium sulfate and the like are precipitated, and the pH value is adjusted by matching with substances such as a high molecular compound and the like to float out, and the specific treatment process flow is as follows: microalgae cultivation wastewater, coarse grid, fine mesh screening machine, blending pool, metering tank, pH adjusting pool, activated sludge pool, final Shen Chi contact aeration pool and backwater.
Comparative example 4
A microalgae cultivation wastewater recycling method adopts a general biological treatment method and comprises the following steps: adding fast-growing bacteria such as stenotrophomonas, bacillus subtilis and the like into microalgae cultivation wastewater for treatment, wherein the specific treatment process flow is as follows: microalgae cultivation wastewater, coarse grid, fine mesh screening machine, blending pool, metering tank, pH adjusting pool, activated sludge pool, final Shen Chi, sludge concentration pool, sludge dehydrator, and then sludge cake and filtrate are obtained.
In order to further illustrate that the technical effect of the invention can be achieved, the following experiment is carried out:
the microalgae cultivation wastewater recovery treatment was performed by the methods of examples 1 to 6 and comparative examples 1 to 4, the conditions of wastewater recovery, microbial contamination of the recovered water, and the like were observed for each group, and the recovered water was used for microalgae cultivation to observe the growth conditions of microalgae, and the experimental results are shown in table 1 below.
TABLE 1
Note that: R.SP in Table 1 stands for rotifer-Rotataria SP, C.SP stands for protozoa-Chilodonella SP, E.Coli stands for Escherichia Coli.
From the experimental data in table 1, when the microalgae cultivation wastewater is recovered, the blockage phenomenon can not occur, so that the treatment speed is high, the energy is saved, the environment is protected, the energy consumption is low, the efficiency is high, the microbial pollution of the recovered water is low, and when the microalgae cultivation wastewater is used for cultivating microalgae, the microalgae growth condition is good.
And when the backwater treated by the method of the comparative example 1 is used for culturing microalgae, the growth condition of the microalgae is poor. In the method of comparative example 2, when algae cultivation wastewater is recovered, the rolling filter falls down by natural gravity, so that the filter is easy to stop due to the adoption of 900 meshes, and is large in loss, difficult to operate continuously, and further the filtering efficiency is affected. In comparative example 3, the chemical treatment recovery water quality conditions were: bod=28, cod=97, ss=28, and the total number of bacteria was 18 ten thousand. In comparative example 4, the biological treatment method recovery water quality conditions were: bod=62, cod=98, ss=30, and total bacteria count is 20 ten thousand.
In summary, the method reduces the energy consumption of the microalgae water recovery process, has the advantages of no chemical use and no residue in the whole process, reduces the algae powder impurities, improves the algae powder quality, has high treatment speed, is energy-saving and environment-friendly, can continuously operate, has large treatment capacity, can be applied to microalgae industry, has low energy consumption and high efficiency, can effectively reduce the recycling treatment cost of microalgae cultivation wastewater, and is suitable for industrial use.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. The microalgae cultivation wastewater recycling method is characterized by comprising the following steps of: after the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer screening filtration, aeration tank treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, and the method specifically comprises the following steps of:
(1) Centrifugally filtering the microalgae cultivation wastewater to obtain filtrate A and filter residue A;
(2) Sending the filtrate A into a multi-layer mesh flushing device for multi-layer screening and filtering to obtain filtrate B and filter residue B;
(3) Delivering the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and delivering the filtrate B into a multi-layer mesh flushing device for multi-layer mesh filtration to obtain filtrate C and filter residue C; the high-concentration gas dissolving treatment is to send filtrate B into an aeration tank filled with high-concentration gas, so that the materials react to achieve the effect of dissolving and separating, wherein the high-concentration gas is CO and O with the following concentration 2 、O 3 、CO 2 And (3) sequentially introducing gas: CO (carbon monoxide)The concentration is 10-20 ppm; the O is 2 The concentration of (2) is 40-50 ppm; the O is 3 The concentration of (2) is 10-20 ppm; the CO 2 The concentration of (2) is 2000-3000 ppm;
(4) And sending the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae cultivation, and the purpose of recycling microalgae cultivation wastewater is achieved.
2. The microalgae cultivation wastewater recycling method according to claim 1, which is characterized in that: the filter residue A is algae mud.
3. The microalgae cultivation wastewater recycling method according to claim 1, which is characterized in that: the bottom of the aeration tank is provided with a sewage outlet, and dead microorganisms are regularly discharged from the sewage outlet.
4. The microalgae cultivation wastewater recycling method according to claim 1, which is characterized in that: the multi-layer screen filtration is carried out by using 500-550 meshes, 600-650 meshes and 800-850 meshes in sequence.
5. The microalgae cultivation wastewater recycling method according to claim 1, which is characterized in that: the vacuum degree of the vacuum filtration is-0.04 to-0.06 MPa, the filter screen is 1200-1500 meshes, and the power of the vacuum machine is 43-47 Kw.
6. The microalgae cultivation wastewater recycling method according to claim 1, which is characterized in that: mixing the filter residue B, the filter residue C and the filter residue D which are used for collecting the microbial residues, and fermenting to prepare the organic fertilizer.
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