CN107265725B - Ozone treatment method for pig farm sewage for microalgae cultivation - Google Patents
Ozone treatment method for pig farm sewage for microalgae cultivation Download PDFInfo
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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
- C02F1/72—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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention relates to a method for treating pig farm sewage by ozone for microalgae cultivation, which comprises the following steps: step S1, ozone decoloration and sterilization treatment in the primary ozone processor: step S2, secondary treatment is carried out by utilizing recovered ozone in the secondary ozone aeration processor: and step S3, blowing off ozone in the three-stage air aeration processor. Its advantages are high effect. The method for treating the pig farm sewage by using the ozone for the microalgae cultivation has the characteristics of high ozone utilization rate, good sewage treatment effect, no ozone residue, obvious improvement on the transparency of the treated sewage and direct application to the microalgae cultivation.
Description
Technical Field
The invention relates to the technical field of pretreatment of microalgae purification sewage, in particular to a method for treating pig farm sewage by ozone for microalgae cultivation.
Background
With the increase of population, the improvement of living standard and the rapid development of social economy, the demand of human beings for animal proteins is gradually increased. Solves the problem of human animal protein shortage and depends on culture. The development of livestock and poultry and aquaculture is an important measure for solving the shortage of animal protein. Waste gas, waste liquid and waste residue generated in the process of large-scale livestock and poultry breeding often cause great pressure on the protection of the surrounding ecological environment. The breeding sewage and liquid excrement are the difficult points of the harmless treatment of pollutants in intensive livestock and poultry farms. The main pollutants in the pig farm breeding sewage are high-concentration nitrogen, phosphorus, organic matters and the like. The sewage of the pig farm is discharged to the surrounding water body, which can cause the serious eutrophication of the natural water body. How to purify the pig farm becomes more and more a restriction factor of the sustainable production of the large-scale pig farm. The development of a sewage treatment technology which can be recycled, is high-efficiency and low-cost is an important measure for the sustainable development of large-scale live pig breeding.
The microalgae as a low-grade photoautotrophic organism has the characteristics of rich species, high photosynthetic efficiency, rapid growth and propagation, high cell nutritive value (rich in active substances such as protein, essential fat and vitamins) and wide application (feed additives, biological energy sources and extracted physiological active substances) and the like, and can efficiently absorb and utilize nitrogen, phosphorus and other nutritive salts in water. The pig farm sewage is utilized to carry out microalgae culture, so that sewage purification treatment and microalgae biomass production can be realized undoubtedly, and the sustainable environment and the cyclic utilization of resources are realized. Therefore, the pig farm sewage purification coupled with the microalgae biomass production is becoming a new idea for the resource treatment of the pig farm sewage.
However,protozoa, bacteria and the like exist in the pig farm sewage, the cultivation failure is easily caused when the pig farm sewage is directly used for microalgae cultivation, the chromaticity of the sewage and suspended particles contained in the sewage influence the permeability of light in the sewage and are not beneficial to the photosynthesis of the microalgae, and therefore the pig farm sewage needs to be subjected to certain filtration, disinfection and bleaching treatment before the pig farm sewage is used for microalgae cultivation. Currently, the disinfection and bleaching of sewage include available chlorine method (such as bleaching powder, sodium hypochlorite and the like) and ozone method. The effective chlorine method needs to add chemical reagents, so that the pretreatment cost and links are increased, and the utilization rate of partial nitrogen and phosphorus in the sewage is reduced. Ozone (O)3) Also known as superoxide, is oxygen (O)2) Is a light blue gas with special odor at normal temperature. The stability is poor at normal temperature and normal pressure, and the oxygen can be automatically decomposed into oxygen. Ozone has strong oxidizing ability, is commonly used for sterilization, detoxification, fresh-keeping, bleaching, deodorization and other purposes in industrial and agricultural production, and the strong oxidizing property of ozone can oxidize redundant or toxic inorganic matters such as cyanide and the like to remove organic matters in water by oxidation, particularly organic matters which are difficult to degrade by microorganisms such as surfactant, reduce BOD and COD in water, inactivate viruses and bacteria in water and generate clean and harmless sterilized water. Can be widely applied to drinking water sterilization, reclaimed water recycling and purification, sewage treatment, greenhouse soil disinfection, swimming pool water treatment and hospital sewage treatment.
At present, the sewage is treated by ozone in production usually by an aeration method and ozone-containing air is introduced into the sewage. However, the solubility of ozone in water is not high, and only 0.494 volume of ozone can be dissolved in 1 volume of water at normal temperature and pressure. The traditional aeration method for treating sewage by ozone has the defects of small gas-liquid contact surface, low ozone utilization rate and long-time aeration, and the short-time treatment effect is poor. Meanwhile, the sterilization effect of the ozone is related to the temperature and the humidity, particularly the humidity, the relative humidity is less than 45%, and the ozone hardly has a killing effect on suspended microorganisms in the air. The increase was gradual only at 60% and reached a maximum at 95% humidity. Therefore, the improvement of the ozone treatment method is an important way for improving the application of ozone in sterilization, detoxification, bleaching, deodorization and the like in sewage. However, no report is found about the method for improving the ozone sewage treatment efficiency at present.
Disclosure of Invention
The invention aims to provide an ozone treatment method capable of efficiently treating pig farm sewage, so that the treated pig farm sewage can be directly used for microalgae culture, the ozone treatment efficiency is improved, the ozone residue is reduced, the oxidation and disinfection of the pig farm culture sewage are effectively carried out, the chromaticity of the pig farm culture sewage is reduced, and the convenience is provided for carrying out microalgae culture by subsequently utilizing the pig farm culture sewage.
Yet another object of the present invention is: provides a piggery sewage ozone treatment device for microalgae cultivation.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pig farm sewage ozone treatment method for microalgae cultivation is characterized by comprising the following steps:
step S1, processing in the primary ozone processor: after multi-stage filtration, the pig farm breeding sewage is input from the upper end of the primary ozone processor in a spraying mode, and ozone generated by an ozone generator is input from the lower end of the columnar stainless steel primary ozone processor to treat the sewage;
step S2, treating in a secondary ozone aeration processor: the sewage treated by the first ozone is output from the bottom end of the primary ozone processor and enters the lower end of the secondary ozone aeration processor through a pipeline pump; the top end of the primary ozone processor is provided with an air outlet which is connected with an air inlet of a first air pump, and the air outlet of the first air pump is connected with the sewage in the secondary ozone aeration processor through an air pipe and air stones for secondary ozone aeration treatment;
and step S3, treating in the third-stage air aeration processor, wherein the treated water flowing out of an overflow port at the upper end of the second-stage ozone aeration processor enters the third-stage air aeration processor, and the water treated by the third-stage air aeration processor flows into a container for culturing microalgae.
As a preferable technical scheme, the primary ozone processor, the secondary ozone aeration processor and the tertiary air aeration processor are all cylindrical barrels, are made of stainless steel and contain 25% of Cr-containing ferrochrome alloy.
As a preferred technical scheme, the sewage spraying amount is adjusted according to the power of an ozone generator and the chromaticity of the sewage, so that the ratio of the ozone amount generated in unit time to the sewage spraying amount in unit time is between 3 and 5mg/L, the adjustment is correspondingly carried out according to the chromaticity of the sewage, the diameter of a sewage droplet formed by spraying is between 30 and 150 micrometers, and the humidity in a primary ozone processor is kept to be more than 90 percent.
As a preferred technical scheme, the diameter of the primary ozone processor is between 30 and 50cm, the distance from a spray nozzle to the bottom of the container is more than 150cm, and the time for the sewage liquid drops to fall to the bottom of the primary ozone processor is between 0.5 and 1.0min under the combined action of air flows of lower end air inlet and upper end air outlet.
As a preferred technical scheme, the gas quantity generated by a first gas pump connected with a top gas outlet of the primary ozone processor is less than or equal to the gas quantity generated by an ozone generator, and the output gas pressure is greater than 150cm water column.
As a preferable technical scheme, the diameter of the secondary ozone aeration processor is more than 30cm, sewage output by the primary ozone processor enters the bottom of the secondary ozone aeration processor by a pipeline pump, the sewage flows to the tertiary air aeration processor from an overflow port at the upper end after being aerated in the secondary processor, and the distance between the overflow port and the bottom of a container of the secondary processor is more than 100 cm.
As a preferable technical scheme, the diameter of the three-stage air aeration processor is more than 30cm, a second air pump is arranged on the three-stage air aeration processor, the air pressure generated by the second air pump is more than 150cm of water column, and the aeration rate is more than 100L/min.
In order to achieve the second object, the invention adopts the technical scheme that:
a piggery sewage ozone treatment device for microalgae cultivation comprises a primary ozone treatment device, a secondary ozone aeration processor and a tertiary air aeration processor;
the side edge of the upper end of the primary ozone processor is connected with a sewage spraying pipe, and the side edge of the lower end of the primary ozone processor is connected with an ozone generator; the top end of the primary ozone processor is connected with a first air pump, an opening is formed in the side edge of the first air pump, an inflation tube is connected in the opening, a tourmaline is arranged at the other end of the inflation tube, and the inflation tube penetrates from the top end to the bottom end of the secondary ozone aeration processor; the bottom ends of the primary ozone treatment and the secondary ozone aeration treatment are respectively provided with an interface channel, the two interface channels are connected through a pipeline, a pipeline pump is arranged in the middle of the pipeline, and valves are arranged at two ends of the pipeline; the input end of the pipeline pump is provided with a valve, and the output end of the pipeline pump is provided with a check valve; the side edge of the upper end of the secondary ozone aeration processor is provided with an overflow port, a connecting pipe is arranged in the overflow port, the other end of the connecting pipe is communicated with a port channel at the bottom of the tertiary air aeration processor, and the other end of the connecting pipe is provided with a valve; the top end of the three-stage air aeration processor is connected with a second air pump, the second air pump is connected with an air inflation tube, the other end of the air inflation tube is provided with a gas stone, and the air inflation tube is inserted into the bottom end of the three-stage air aeration processor from the top end of the three-stage air aeration processor; and one side of the upper end of the three-stage air aeration processor is provided with an overflow water outlet.
The invention has the advantages that:
1. according to the pig farm sewage ozone treatment method and device for microalgae cultivation, sewage enters the primary ozone reactor in a spraying mode, the diameter of sewage water drops is controlled to be 30-150 micrometers, the surface area/volume ratio of liquid in the reactor is maximized as far as possible, the sewage and ozone are guaranteed to be in full contact, ozone is favorably and quickly dissolved into the sewage, the atomized water drops slowly descend in the reaction column under the action of air suction at the top end of the primary ozone reactor, and the sufficient treatment time of the ozone is guaranteed, so that the oxidation, disinfection, bleaching and deodorization effects of the ozone are greatly improved compared with those of a traditional aeration method.
2. Air with residual ozone is sucked from the primary ozone reactor and enters the sewage of the secondary ozone reactor in an aeration mode, so that the residual ozone is continuously dissolved in the sewage, and the stirring effect generated by aeration promotes the uniform mixing of the ozone in the sewage.
3. The ozone treatment water from the secondary ozone reactor is aerated in the tertiary air aeration processor, and simultaneously, the water is discharged in an upper end overflow mode, so that residual ozone in the water body can be effectively removed, and the treated sewage can be directly used for microalgae cultivation.
Drawings
FIG. 1 is a flow chart of the method for treating the pig farm sewage by ozone for microalgae cultivation.
FIG. 2 is a schematic structural diagram of a pig farm sewage ozone treatment device for microalgae cultivation.
FIG. 3 is a schematic diagram of the implementation effect.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
The reference numerals and components referred to in the drawings are as follows:
1. first-stage ozone processor 2, second-stage ozone aeration processor
3. Three-stage air aeration processor 4. ozone generator
5. First air pump 6. pipeline pump
7 second air pump 8 sewage spraying pipe
9. Overflow outlet 10. water outlet
11. Valve 12. inflation tube
13. Air stone
Example 1
The embodiment is used for a sewage microalgae culture experiment after ozone treatment of the sewage of a pig farm is carried out in a standardized pig farm under the Guangming group. Referring to fig. 1 and 2, fig. 1 is a flow chart of a method for treating pig farm sewage with ozone for microalgae cultivation according to the present invention. FIG. 2 is a schematic structural diagram of a pig farm wastewater ozone treatment device for microalgae cultivation. A pig farm sewage ozone treatment method for microalgae cultivation comprises the following steps:
step S1, the primary ozone processor 1: after multi-stage filtration, the pig farm breeding sewage is input from the upper end of the primary ozone processor 1 in a spraying mode, and ozone generated by the ozone generator 4 is input from the lower end of the columnar stainless steel primary ozone processor 1 to treat the sewage;
step S2, treating in a secondary ozone aeration processor: the sewage treated by the first ozone is output from the bottom end of the primary ozone processor 1 and enters the lower end of the secondary ozone aeration processor 2 through a pipeline pump 6; the top end of the primary ozone processor 1 is provided with an air outlet which is connected with an air inlet of a first air pump 5, and the air outlet of the first air pump 5 is connected into the sewage in the secondary ozone aeration processor 2 through an air pipe and an air stone 13 for secondary ozone aeration treatment;
and step S3, treating in the third-stage air aeration processor, wherein the treated water flowing out of an overflow port 9 at the upper end of the second-stage ozone aeration processor 2 enters the third-stage air aeration processor 3, and the treated water treated by the third-stage air aeration processor 3 flows into a container for culturing microalgae.
Wherein, the columnar cylinder body of the primary ozone processor 1 is made of stainless steel (ferrochrome containing 25% of Cr).
Wherein, the sewage spraying amount is adjusted according to the power of the ozone generator 4 and the chromaticity of the sewage, so that the ratio of the ozone amount generated in unit time to the sewage spraying amount in unit time is 3-5mg/L, preferably 4mg/L in the embodiment, the adjustment is correspondingly carried out according to the chromaticity of the sewage, the diameter of the sewage droplet formed by spraying is 30-150 micrometers, and the humidity in the primary ozone processor 1 is kept above 90%.
Wherein, the diameter of the columnar primary ozone processor 1 is between 30cm and 50cm, the distance from the spray nozzle to the bottom of the container is more than 150cm, and the time for the sewage liquid drops to fall to the bottom of the primary ozone processor is 0.5 to 1.0min under the combined action of the air flow of the lower end air inlet and the upper end air outlet.
Wherein, the air pump connected with the air outlet at the top end of the primary ozone processor 1 generates air quantity slightly smaller than or equal to the air quantity generated by the ozone generator 4, and the output air pressure is larger than 150cm water column.
Wherein, the diameter of the columnar secondary ozone aeration processor is more than 30cm, sewage output by the primary ozone processor 1 enters the bottom of the secondary ozone aeration processor by a pipeline pump 6, the sewage flows to the tertiary air aeration processor 3 from an overflow port 9 at the upper end after aeration treatment in the secondary processor, and the distance between the overflow port 9 and the bottom of a container of the secondary processor is more than 100 cm.
Wherein, the diameter of the three-stage air aeration processor 3 is more than 30cm, and the three-stage air aeration processor 3 is provided with a second air pump 7, the air pressure generated by the second air pump 7 is more than 150cm water column, and the aeration rate is more than 100L/min.
Example 2
A piggery sewage ozone treatment device for microalgae cultivation comprises a primary ozone treatment device, a secondary ozone aeration processor 2 and a tertiary air aeration processor 3; the side edge of the upper end of the primary ozone processor 1 is connected with a sewage spraying pipe 8, and the side edge of the lower end of the primary ozone processor 1 is connected with an ozone generator 4; the top end of the primary ozone processor 1 is connected with a first air pump 5, an opening is formed in the side edge of the first air pump 5, an air charging pipe 12 is connected in the opening, a gas stone 13 is arranged at the other end of the air charging pipe 12, and the air charging pipe 12 penetrates from the top end to the bottom end of the secondary ozone aeration processor 2; the bottom ends of the primary ozone treatment and the secondary ozone aeration treatment are respectively provided with an interface channel, the two interface channels are connected through a pipeline, the middle of the pipeline is provided with a pipeline pump 6, two ends of the pipeline pump 6 are respectively provided with a valve 11, two ends of the pipeline are also provided with the valves 11, and the output end of the pipeline is provided with a check valve; the side edge of the upper end of the secondary ozone aeration processor 2 is provided with an overflow port 9, a connecting pipe is arranged in the overflow port 9, the side edge of the other end of the connecting pipe is communicated with a port channel at the bottom of the tertiary air aeration processor 3, and the other end of the connecting pipe is provided with a valve 11; the top end of the three-stage air aeration processor 3 is connected with a second air pump 7, the second air pump 7 is connected with an air inflation tube 12, the other end of the air inflation tube 12 is provided with a gas stone 13, and the air inflation tube 12 is inserted into the bottom end of the three-stage air aeration processor 3 from the top end of the three-stage air aeration processor; a water outlet 10 is arranged on one side of the upper end of the three-stage air aeration processor 3.
Wherein, the columnar cylinder body of the primary ozone processor 1 is made of stainless steel (ferrochrome containing 25% of Cr).
Wherein, the sewage spraying amount is adjusted according to the power of the ozone generator 4 and the chromaticity of the sewage, so that the ratio of the ozone amount generated in unit time to the sewage spraying amount in unit time is 3-5mg/L, preferably 4mg/L in the embodiment, the adjustment is correspondingly carried out according to the chromaticity of the sewage, the diameter of the sewage droplet formed by spraying is 30-150 micrometers, and the humidity in the primary ozone processor 1 is kept above 90%.
Wherein, the diameter of the columnar primary ozone processor 1 is between 30cm and 50cm, the distance from the spray nozzle to the bottom of the container is more than 150cm, and the time for the sewage liquid drops to fall to the bottom of the primary ozone processor is 0.5 to 1.0min under the combined action of the air flow of the lower end air inlet and the upper end air outlet.
Wherein, the air pump connected with the air outlet at the top end of the primary ozone processor 1 generates air quantity slightly smaller than or equal to the air quantity generated by the ozone generator 4, and the output air pressure is larger than 150cm water column.
Wherein, the diameter of the columnar secondary ozone aeration processor is more than 30cm, sewage output by the primary ozone processor 1 enters the bottom of the secondary ozone aeration processor by a pipeline pump 6, the sewage flows to the tertiary air aeration processor 3 from an overflow port 9 at the upper end after aeration treatment in the secondary processor, and the distance between the overflow port 9 and the bottom of a container of the secondary processor is more than 100 cm.
Wherein, the diameter of the three-stage air aeration processor 3 is more than 30cm, and the three-stage air aeration processor 3 is provided with a second air pump 7, the air pressure generated by the second air pump 7 is more than 150cm water column, and the aeration rate is more than 100L/min.
The implementation effect is as follows:
after the pig farm sewage with the initial ammonia nitrogen concentration of 154.48mg/L is treated by the ozone treatment method, the initial brown-black color can be removed to form yellow transparent liquid, and the transmittance is greatly enhanced (as shown in figure 3); meanwhile, 16.83% of ammoniacal nitrogen can be removed, 20.76% of total nitrogen can be removed, 9.76% of COD and 5.65% of total phosphorus can be removed. The treated sewage is input into a microalgae culture container, and the microalgae grows vigorously without adverse effects.
According to the method and the device for treating the sewage in the pig farm by using the ozone, the sewage enters the primary ozone reactor in a spraying mode, and the diameter of sewage water drops is controlled to be 30-150 micrometers, so that the surface area/volume ratio of liquid in the reactor is maximized as much as possible, the sewage is ensured to be fully contacted with the ozone, the ozone is favorably and quickly dissolved into the sewage, and the air suction effect of the top end of the primary ozone reactor is that the atomized water drops slowly drop in a reaction column, so that the sufficient treatment time of the ozone is ensured, and the oxidation, disinfection, bleaching and deodorization effects of the ozone are greatly improved compared with those of the traditional aeration method. Air with residual ozone is sucked from the primary ozone reactor and enters the sewage of the secondary ozone reactor in an aeration mode, so that the residual ozone is continuously dissolved in the sewage, and the stirring effect generated by aeration promotes the uniform mixing of the ozone in the sewage. The ozone treatment water from the secondary ozone reactor is aerated in the tertiary air aeration processor 3, and the upper end overflow mode is adopted to discharge water, so that residual ozone in the water body can be effectively removed, and the treated sewage can be directly used for microalgae cultivation.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (6)
1. A pig farm sewage ozone treatment method for microalgae cultivation is characterized by comprising the following steps:
step S1, processing in the primary ozone processor: after the pig farm breeding sewage is subjected to multi-stage filtration, the pig farm breeding sewage is input from the upper end of the first-stage ozone processor in a spraying mode, and ozone generated by the ozone generator is input from the lower end of the first-stage ozone processor to treat the sewage; adjusting the spray amount of the sewage according to the power of an ozone generator and the chromaticity of the sewage to ensure that the ratio of the amount of ozone generated in unit time to the spray amount of the sewage in unit time is between 3 and 5mg/L, and specifically, correspondingly adjusting according to the chromaticity of the sewage, wherein the diameter of a sewage droplet formed by spraying is between 30 and 150 micrometers, and the humidity in the primary ozone processor is kept above 90 percent; the distance from the spray nozzle of the first-stage ozone processor to the bottom of the container is more than 150cm, and the time for the sewage liquid drops to fall to the bottom of the first-stage ozone processor is 0.5-1.0min under the combined action of the air flow of the lower-end air inlet and the upper-end air outlet;
step S2, treating in a secondary ozone aeration processor: the sewage treated by the first ozone is output from the bottom end of the primary ozone processor and enters the lower end of the secondary ozone aeration processor through a pipeline pump; the top end of the primary ozone processor is provided with an air outlet which is connected with an air inlet of a first air pump, and the air outlet of the first air pump is connected with the sewage in the secondary ozone aeration processor through an air pipe and air stones for secondary ozone aeration treatment;
step S3, processing in a three-stage air aeration processor: treated water flowing out of an overflow port at the upper end of the secondary ozone aeration processor enters the tertiary air aeration processor, and water treated by the tertiary air aeration processor flows into a container for culturing microalgae.
2. The method for ozone treatment of pig farm wastewater for microalgae cultivation according to claim 1, wherein the primary ozone treater, the secondary ozone aeration treater and the tertiary air aeration treater are all cylindrical barrels made of stainless steel and contain ferrochrome alloy containing 25% of Cr.
3. The method of claim 1, wherein the amount of gas generated by the first gas pump connected to the top gas outlet of the primary ozone treatment unit is less than or equal to the amount of gas generated by the ozone generator, and the output gas pressure is greater than 150cm of water.
4. The method for ozone treatment of pig farm wastewater for microalgae cultivation as claimed in claim 1, wherein the diameter of the secondary ozone aeration treatment device is more than 30cm, the wastewater output from the primary ozone treatment device enters the bottom of the secondary ozone aeration treatment device by means of a pipeline pump, the wastewater flows from an overflow port at the upper end to the tertiary air aeration treatment device after being aerated in the secondary ozone aeration treatment device, and the distance from the overflow port to the bottom of the secondary ozone aeration treatment device container is more than 100 cm.
5. The method of claim 1, wherein the diameter of the tertiary air aeration treatment device is more than 30cm, and a second air pump is arranged on the tertiary air aeration treatment device, the air pressure generated by the second air pump is more than 150cm of water column, and the aeration rate is more than 100L/min.
6. The piggery sewage ozone treatment device for microalgae cultivation is characterized by comprising a primary ozone processor, a secondary ozone aeration processor and a tertiary air aeration processor; the side edge of the upper end of the primary ozone processor is connected with a sewage spraying pipe, and the side edge of the lower end of the primary ozone processor is connected with an ozone generator; the top end of the primary ozone processor is connected with a first air pump, an opening is formed in the side edge of the first air pump, an inflation tube is connected in the opening, a tourmaline is arranged at the other end of the inflation tube, and the inflation tube penetrates from the top end to the bottom end of the secondary ozone aeration processor; the bottom ends of the primary ozone processor and the secondary ozone aeration processor are respectively provided with an interface channel, the two interface channels are connected through a pipeline, a pipeline pump is arranged in the middle of the pipeline, valves are arranged at two ends of the pipeline, the input end of the pipeline pump is provided with a valve, and the output end of the pipeline pump is provided with a check valve; the side edge of the upper end of the secondary ozone aeration processor is provided with an overflow port, a connecting pipe is arranged in the overflow port, the other end of the connecting pipe is communicated with a port channel at the bottom of the tertiary air aeration processor, and the other end of the connecting pipe is provided with a valve; the top end of the three-stage air aeration processor is connected with a second air pump, the second air pump is connected with an air inflation tube, the other end of the air inflation tube is provided with a gas stone, and the air inflation tube is inserted into the bottom end of the three-stage air aeration processor from the top end of the three-stage air aeration processor; one side of the upper end of the three-stage air aeration processor is provided with an overflow water outlet; the ozone treatment device for pig farm sewage for microalgae cultivation applies the ozone treatment method for pig farm sewage for microalgae cultivation in any one of claims 1-5.
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| CN203461870U (en) * | 2013-09-03 | 2014-03-05 | 同济大学 | Ozone oxidation device for processing secondary biological treatment effluent of urban sewage plant |
| CN104045208A (en) * | 2014-06-10 | 2014-09-17 | 嘉兴学院 | Optical biological reaction method for purifying biogas slurry by utilizing microalgae |
| CN204689706U (en) * | 2015-06-04 | 2015-10-07 | 陕西宝钢气体有限公司 | A kind of Multistage external circulating formula ozone contact reaction device |
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