Method and system for innocent treatment of liquid dung

Abstract

The invention discloses a method and a system for innocent treatment of liquid dung. The method comprises the following steps: acidizing liquid dung; the acidified liquid dung is intermittently subjected to multiple times of aeration treatment, and each aeration treatment independently comprises the steps that part of the liquid dung to be subjected to aeration treatment and oxygen-containing gas are mixed to prepare micro-nano bubble water, and the bubble particle size and the bubble concentration of the micro-nano bubble water are adjusted and controlled based on the pH value of the liquid dung to be subjected to aeration treatment; carrying out aeration treatment on the manure water to be subjected to aeration treatment by utilizing the prepared micro-nano bubble water until the pH value of the manure water to be subjected to aeration treatment is 1t; when 6.5, the bubble particle size lt of the micro-nano bubble water is regulated and controlled; the particle size is 200 nm, and the bubble concentration is 108-109 / mL; when the pH value of the liquid dung to be aerated is 6.5-8.0, the bubble particle size of the micro-nano bubble water is regulated and controlled to be 200-500 nm, and the bubble concentration is 107-108 / mL; the pH value of the liquid dung to be subjected to aeration treatment is gt; when the pH value is 8.0, the bubble particle size of the micro-nano bubble water is regulated and controlled to be 500-1000nm, and the bubble concentration is 106-107 / mL. Therefore, harmless treatment and nutrient loss reduction of the liquid dung can be completed.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural manure water treatment, and specifically relates to a method and a system for harmlessly treating manure water. Background Art

[0002] Rapid harmless treatment of manure water and reduction of nutrient loss in manure water are the hot topics in current manure water treatment research. However, in existing research, these two goals are difficult to achieve at the same time. At present, there are three main ways to reduce the emission of nutrients in manure water: covering the surface of manure water with a shield, adding NH4+ conjugates, and acidifying manure water. The manure water surface covering shield is divided into two types: permeable covering and impermeable covering. Permeable covering mainly uses straw or other crop straw to cover the surface of manure water during manure storage. This method is easily affected by weather factors such as wind and rain. Impermeable covering mainly uses plastic film and other airtight materials for covering. The investment cost of this method is high, and the covering material is prone to aging and is not easy to recycle. Adding NH4+ 4+ The conjugate method mainly involves adding chloride-containing chemicals to the manure water. This method has a high investment cost and low practical application value. The storage of manure water after acidification can quickly reduce the pH value of the manure water, thereby achieving the purpose of reducing ammonia volatilization losses. This method is simple to operate and has low investment, but this method has a long processing time, generally taking 3-6 months, and requires a large amount of storage space.

[0003] Therefore, how to achieve harmless treatment of manure and reduce nutrient loss in manure is of great significance to solving the environmental pollution caused by livestock and poultry manure and its utilization as fertilizer. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, one purpose of the present invention is to provide a method and system for harmlessly treating manure water, which achieves one or more of the following beneficial effects by regulating the bubble particle size and bubble concentration of micro-nano bubble water added to the manure water to be aerated during the aeration treatment process, such as fast manure water treatment speed, low nutrient loss, unattended whole process, good treatment effect, good fertilizer effect, etc.

[0005] In a first aspect of the present invention, a method for harmlessly treating fecal water is proposed, comprising:

[0006] (1) Acidification of fecal water;

[0007] (2) aerating the acidified manure water multiple times intermittently, wherein each aeration treatment independently comprises:

[0008] Mixing part of the manure water to be aerated with oxygen-containing gas to prepare micro-nano bubble water, and adjusting the bubble particle size and bubble concentration in the obtained micro-nano bubble water based on the pH value of the manure water to be aerated;

[0009] The prepared micro-nano bubble water is used to perform aeration treatment on the manure water to be aerated.

[0010] in:

[0011] When the pH value of the manure to be aerated is less than 6.5, the bubble size of the micro-nano bubble water is adjusted to be less than 200 nm and the bubble concentration is 10 8 ~10 9 Pieces / mL;

[0012] When the pH value of the manure to be aerated is 6.5-8.0, the bubble particle size of the micro-nano bubble water is adjusted to be 200-500nm and the bubble concentration is 10 7 ~10 8 Pieces / mL;

[0013] When the pH value of the manure to be aerated is greater than 8.0, the bubble particle size of the micro-nano bubble water is adjusted to be 500-1000nm and the bubble concentration is 10 6 ~10 7 Pieces / mL.

[0014] The following disadvantages exist in the current manure treatment process: the harmless treatment cycle is long, which indirectly increases the treatment cost; the nutrient loss is serious during the harmless treatment process, and the manure is not used as fertilizer after treatment, resulting in a waste of resources. According to the method for harmless treatment of manure in the present invention, by controlling the nano bubble particle size and concentration in the micro-nano bubble water used in the harmless treatment of manure to be aerated, one or more of the beneficial effects of fast manure treatment speed, low nutrient loss, good treatment effect, and good fertilizer effect can be achieved.

[0015] In addition, the method for harmlessly treating sewage according to the above embodiment of the present invention may also have the following additional technical features:

[0016] In some embodiments of the present invention, when the pH value of the manure to be aerated is <6.5, the aeration time of the aeration treatment is regulated to 3 to 4 minutes; when the pH value of the manure to be aerated is 6.5 to 8.0, the aeration time of the aeration treatment is regulated to 2 to 3 minutes; when the pH value of the manure to be aerated is >8.0, the aeration time of the aeration treatment is regulated to 1 to 2 minutes.

[0017] In some embodiments of the present invention, when the pH value of the manure to be aerated is 5.5-6.5, the bubble diameter of the micro-nano bubble water is 10-200 nm and the bubble concentration is 10 8 ~10 9 / mL, aeration time of 3 to 4min; when the pH value of the manure to be aerated is 6.5 to 7, the bubble particle size of the micro-nano bubble water is adjusted to 200 to 300nm, the bubble concentration is 10 7 ~10 8 / mL, the aeration time is 2 to 3min; when the pH value of the manure to be aerated is 7.0 to 7.5, the bubble particle size of the micro-nano bubble water is adjusted to be 300 to 400nm, the bubble concentration is 10 7 ~10 8 / mL, aeration time of 2 to 3min; when the pH value of the manure to be aerated is 7.5 to 8, the bubble diameter of the micro-nano bubble water is 400 to 500nm and the bubble concentration is 10 7 ~10 8 / mL, aeration time is 2 to 3 minutes.

[0018] In some embodiments of the present invention, the method for harmlessly treating manure water further includes: testing the Ts value of the manure water to be aerated, and adjusting the bubble particle size and bubble concentration in the micro-nano bubble water, and the required aeration time based on the pH value and Ts value of the manure water to be aerated, wherein: when the pH value of the manure water to be aerated is <6.5 and the Ts value is >7.5%, the bubble particle size in the micro-nano bubble water is adjusted to be 100-200nm and the bubble concentration is 10 8 ~10 9 / mL, aeration time of 3 to 4 minutes; when the pH value of the manure to be aerated is <6.5, Ts value ≤7.5%, the bubble size of the micro-nano bubble water is adjusted to 10 to 100 nm, the bubble concentration is 10 8 ~10 9 / mL, aeration time of 3 to 4min; when the pH value of the manure to be aerated is 6.5 to 8.0, Ts value> 7.5%, the bubble size of the micro-nano bubble water is adjusted to 200 to 300nm, the bubble concentration is 10 7 ~10 8 / mL, aeration time of 2 to 3min; when the pH value of the manure to be aerated is 6.5 to 8.0, Ts value ≤ 7.5%, the bubble size of the micro-nano bubble water is 300 to 500nm, the bubble concentration is 10 7 ~10 8 / mL; the aeration time is 2 to 3 minutes; when the pH value of the manure to be aerated is >8.0 and the Ts value is >7.5%, the bubble particle size of the micro-nano bubble water is adjusted to be 500 to 700 nm and the bubble concentration is 10 6 ~10 7 / mL, aeration time of 1 to 2min; when the pH value of the manure to be aerated is >8.0 and the Ts value is ≤7.5%, the bubble particle size of the micro-nano bubble water is adjusted to be 700 to 1000nm and the bubble concentration is 10 6 ~10 7 / mL, and the aeration time is 1 to 2 minutes.

[0019] In some embodiments of the present invention, the acidification treatment includes a stirring operation.

[0020] In some embodiments of the present invention, the acidification treatment and / or the aeration treatment is performed at a constant temperature.

[0021] In some embodiments of the present invention, each aeration treatment independently comprises: supplying the prepared micro-nano bubble water to the fecal water to be aerated and then letting it stand.

[0022] In some embodiments of the present invention, a containing device is used to perform the acidification treatment and the aeration treatment on the manure water; a portion of the manure water to be aerated is supplied to a micro-nano bubble generating device to be mixed with oxygen-containing gas to prepare micro-nano bubble water; the prepared micro-nano bubble water is returned to the containing device to perform aeration treatment on the manure water to be aerated, wherein an automatic control unit is used to independently regulate the bubble particle size and bubble concentration in the micro-nano bubble water to be obtained by each aeration treatment: a pH sensor is provided in the containing device; the micro-nano bubble generating device includes a first conveying pipeline, a second conveying pipeline, a variable frequency water pump, an air pump, a gas flow meter, a pressure detection device and a gas-water mixing chamber, one end of the first conveying pipeline is connected to the containing device, and the other end is connected to the water inlet of the variable frequency water pump, and an oxygen-containing gas inlet is provided on the first conveying pipeline, and the oxygen-containing gas inlet is passed through a gas flow meter The air pump is connected to the air pump; the air-water mixing chamber includes an air-water mixture inlet and a micro-nano bubble water outlet, one end of the second delivery pipeline is connected to the water outlet of the variable frequency water pump, and the other end is connected to the air-water mixture inlet; the micro-nano bubble water outlet is connected to the containing device, and the pressure detection device is arranged on the second delivery pipeline; the automatic control unit is connected to the pH sensor, the air pump, the gas flow meter, the variable frequency water pump and the pressure detection device, and is suitable for receiving the signal transmitted by the pH sensor to obtain the pH value of the fecal water to be aerated, as well as the values ​​displayed by the gas flow meter and the pressure detection device, and based on the pH value, regulating the start and stop, frequency and / or opening of the air pump and the variable frequency water pump, controlling the air intake of the first delivery pipeline and the pipeline pressure of the second delivery pipeline, and obtaining micro-nano bubble water with expected bubble particle size and expected bubble concentration.

[0023] In some embodiments of the present invention, the method for harmlessly treating manure water further includes: using the automatic control unit to independently regulate the aeration time required for each aeration treatment, and the automatic control unit regulates the aeration time required for each aeration treatment based on the pH value.

[0024] In some embodiments of the present invention, the method for harmlessly treating manure water also includes: inputting the Ts value of the manure water to be aerated into the automatic control unit, and the automatic control unit is suitable for regulating the start and stop, frequency and / or opening of the air pump and the variable frequency water pump based on the pH value and the input Ts value, controlling the air intake volume of the first delivery pipeline and the pipeline pressure of the second delivery pipeline, and obtaining micro-nano bubble water with expected bubble particle size and bubble concentration.

[0025] In some embodiments of the present invention, the method for harmlessly treating manure water also includes: controlling the value displayed by the pressure detection device by adjusting the frequency of the air pump and / or the variable frequency water pump, wherein: when the pH value of the manure water to be aerated is <6.5, the value displayed by the pressure detection device is controlled to be 0.30MPa~0.32Mpa, and the flow rate displayed by the gas flowmeter is 0.4~0.6L / min; when the pH value of the manure water to be aerated is 6.5~8.0, the value displayed by the pressure detection device is controlled to be 0.29MPa~0.30Mpa, and the flow rate displayed by the gas flowmeter is 0.3~0.4L / min; when the pH value of the manure water to be aerated is >8.0, the value displayed by the pressure detection device is controlled to be 0.28MPa~0.30Mpa, and the flow rate displayed by the gas flowmeter is <0.2L / min.

[0026] In some embodiments of the present invention, a temperature control device and an automatic control unit are used to automatically control the treatment temperature of the acidification treatment and / or the aeration treatment; and / or, the containing device is also provided with a temperature sensor, the automatic control unit is connected to the temperature sensor, and is suitable for receiving the signal transmitted by the temperature sensor to obtain the temperature of the manure water, and controls the start and stop and the temperature control range of the temperature control device based on the temperature of the manure water and the preset acidification treatment temperature and / or the preset aeration treatment temperature.

[0027] In some embodiments of the present invention, the micro-nano bubble water is returned to the containing device, the manure water is allowed to stand after aeration treatment, and when the dissolved oxygen concentration in the manure water is lower than a preset threshold, the micro-nano bubble generating device is started again; and / or, an oxygen content sensor is also provided in the containing device, and the automatic control unit is connected to the oxygen content sensor and is suitable for receiving the signal transmitted by the oxygen content sensor to obtain the dissolved oxygen concentration of the manure water, and controlling the start and stop of the micro-nano bubble generating device based on the dissolved oxygen concentration; and / or, the preset threshold is less than or equal to 0.5 mg / L.

[0028] In some embodiments of the present invention, a stirring device is used to stir the manure water during the acidification treatment process, and the stirring device is arranged in the containing device; and / or the automatic control unit is connected to the stirring device and is suitable for automatically controlling the start and stop of the stirring device during the acidification treatment stage.

[0029] In a second aspect of the present invention, a system for implementing the method for harmlessly treating sewage according to the first aspect of the present invention is provided, comprising:

[0030] A containing device, the containing device having a manure containing space, a manure outlet to be aerated, and a pH sensor, the containing device is suitable for containing manure and performing acidification and aeration treatment on the contained manure, and the pH sensor is suitable for detecting the pH value of the manure contained in the containing space;

[0031] A micro-nano bubble generating device, the micro-nano bubble generating device comprising a first delivery pipeline, a second delivery pipeline, a variable frequency water pump, an air pump, a gas flow meter, a pressure detection device and a gas-water mixing chamber, one end of the first delivery pipeline is connected to the outlet of the manure water to be aerated, and the other end is connected to the water inlet of the variable frequency water pump, the first delivery pipeline is provided with an oxygen-containing gas inlet, and the oxygen-containing gas inlet is connected to the air pump through a gas flow meter; the gas-water mixing chamber comprises an air-water mixture inlet and a micro-nano bubble water outlet, one end of the second delivery pipeline is connected to the water outlet of the variable frequency water pump, and the other end is connected to the air-water mixture inlet; the micro-nano bubble water outlet is connected to the accommodating space, and the pressure detection device is arranged on the second delivery pipeline;

[0032] An automatic control unit, the automatic control unit is connected to the pH sensor, the air pump, the gas flow meter, the variable frequency water pump and the pressure detection device, and is suitable for receiving the signal transmitted by the pH sensor to obtain the pH value of the fecal water to be aerated, as well as the values ​​displayed by the gas flow meter and the pressure detection device, and based on the pH value, regulating the start and stop, frequency and / or opening of the air pump and the variable frequency water pump, controlling the air intake of the first delivery pipeline and the pipeline pressure of the second delivery pipeline, and obtaining micro-nano bubble water with expected bubble particle size and expected bubble concentration.

[0033] According to the system for harmlessly treating manure water in the present invention, it is easy to flexibly adjust the nano bubble particle size and bubble concentration in the micro-nano bubble water obtained when harmlessly treating the manure water to be aerated based on the pH value of the manure water to be aerated, thereby achieving one or more of the beneficial effects of automation of manure water treatment, fast processing speed, low nutrient loss, good processing effect, good fertilizer effect, etc.

[0034] In some embodiments of the present invention, the system for harmlessly treating manure water also includes: a temperature control device and a temperature sensor, the containing device is provided with the temperature sensor and a hollow interlayer, the hollow interlayer is wrapped outside the containing space and is spaced apart from the containing space, the hollow interlayer includes a temperature control medium inlet and a temperature control medium outlet, the temperature control medium inlet and the temperature control medium outlet are adjacent to the temperature control device, the automatic control unit is connected to the temperature control device and the temperature sensor, and is suitable for regulating the temperature of the temperature control device and the temperature control medium based on the actual temperature of the manure water and the preset acidification treatment temperature or aeration treatment temperature, thereby regulating the temperature of the acidification treatment and / or aeration treatment.

[0035] In some embodiments of the present invention, the system for harmlessly treating manure water also includes: an oxygen content sensor, the oxygen content sensor is arranged in the containing device, the automatic control unit is connected to the oxygen content sensor, and is suitable for receiving the signal transmitted by the oxygen content sensor to obtain the dissolved oxygen concentration of the manure water, and controlling the start and stop of the micro-nano bubble generating device based on the dissolved oxygen concentration.

[0036] In some embodiments of the present invention, the system for harmlessly treating sewage further includes: a stirring device, the stirring device is provided in the containing device, the automatic control unit is connected to the stirring device and is suitable for automatically controlling the start and stop of the stirring device during the acidification treatment stage.

[0037] In some embodiments of the present invention, the system for harmlessly treating manure water also includes: an editable display, the automatic control unit includes the editable display, and the editable display is used to select control parameters for harmlessly treating manure water and / or edit control parameters for harmlessly treating manure water. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The figure is a schematic diagram of the structure of a system for harmlessly treating sewage according to an embodiment of the present invention.

[0039] Figure 2 It is a schematic diagram of the structure of a system for harmlessly treating sewage according to another embodiment of the present invention.

[0040] Figure 3 It is a comparison chart of the fecal coliform group changes over time in fecal water of Example 2 of the present invention and Comparative Examples 5 and 6.

[0041] Figure 4 It is a comparison chart of COD value changes over time in fecal water of Example 2 of the present invention and Comparative Examples 5 and 6.

[0042] Figure 5It is a comparison chart of the total nitrogen content in the fecal water of Example 2 of the present invention and Comparative Examples 5 and 6 over time.

[0043] Figure 6 It is a comparison chart of the cumulative emission of ammonia in manure water of Example 2 of the present invention and Comparative Examples 5 and 6 over time.

[0044] Reference numerals:

[0045] A-containing device; B-micro-nano bubble generating device; 1-water inlet tank; 2-water inlet pump; 3-water inlet pipe; 4-water inlet flowmeter; 5-water inlet; 6-pH sensor; 7-containing space; 8-hollow interlayer; 9-stirring device; 10-control cabinet; 11-micro-nano bubble water inlet; 12-gas-water mixing chamber; 13-throttle port; 14-air pump; 15-gas flowmeter; 16-water flowmeter; 17-valve; 18-pressure detection device; 19a-first delivery pipeline; 19b-second delivery pipeline; 20-gas reflux pipe; 21-stirring shaft; 22-micro-nano bubble outlet; 23-frequency conversion water pump; 24-water outlet flowmeter; 25-water outlet pipe; 26-water outlet pump; 27-water outlet tank; 28-water outlet; 29-sampling port; 30-stirring blade; 31-sediment outlet. DETAILED DESCRIPTION

[0046] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0047] At present, the methods for rapid harmlessness of manure water mainly include one or more of the processes such as aeration, stirring filtration, and bioreactors. Among them, aeration, stirring filtration, and bioreactors can achieve the purpose of rapid harmlessness in treating manure water, but the nutrients in manure water are seriously lost in the harmless process. At present, there is a scheme for sewage treatment using micro-nano bubbles, which mainly uses continuous addition of micro-nano bubbles to water to make sewage quickly harmless, but when it is applied to manure water treatment, it is easy to cause the nitrogen in manure water to be lost with the volatilization of bubbles, and the manure water is finally treated as wastewater discharge, resulting in a waste of resources. In addition, when micro-nano bubble water is currently used to treat sewage, biogas slurry, etc., there are still one or more of the following problems: cumbersome process, need for concentration process and addition of multiple auxiliary materials, high cost, and certain restrictions on the volume of suspended particulate matter. In summary, there are mainly the following unfavorable factors in the current manure water treatment process, mainly including: long harmless treatment cycle, which indirectly increases the treatment cost; serious nutrient loss in the harmless treatment process, and not using it as fertilizer after treatment, resulting in a waste of resources.

[0048] In view of this, in a first aspect of the present invention, a method for harmlessly treating fecal water is proposed, comprising:

[0049] (1) Acidification of manure water

[0050] According to the embodiment of the present invention, acidification of manure water can quickly reduce the pH value of the manure water, thereby achieving the purpose of reducing ammonia volatilization loss and reducing the loss of nutrients in the manure water.

[0051] In some embodiments, an acidifier can be mixed with manure for acidification treatment. It should be noted that in the present invention, the type and amount of the acidifier used in the acidification treatment are not particularly limited, and those skilled in the art can flexibly select according to actual needs, such as adjusting the amount of the acidifier based on the type of acidifier used and the amount of manure to be acidified. Exemplary, the acidifier used in the acidification treatment may include but is not limited to H 2 SO 4 , alum, FeSO 4 The amount of acidifier added can be 3‰ to 8‰ of the mass of the manure water.

[0052] In some embodiments, the acidification treatment may also include a stirring operation, which is further conducive to the full contact reaction between the acidifier and the manure water, thereby improving the efficiency and effect of the harmless treatment.

[0053] (2) The acidified manure is subjected to multiple aeration treatments intermittently, and each aeration treatment independently includes:

[0054] A portion of the manure water to be aerated is mixed with oxygen-containing gas to prepare micro-nano bubble water, and the bubble particle size and bubble concentration in the obtained micro-nano bubble water are adjusted based on the pH value of the manure water to be aerated; and the manure water to be aerated is aerated using the prepared micro-nano bubble water.

[0055] When the pH value of the manure to be aerated is less than 6.5, the bubble particle size in the micro-nano bubble water can be adjusted to be less than 200nm (such as 190nm, 170nm, 150nm, 120nm, 100nm, 80nm, 50nm or 30nm, etc.), and the bubble concentration can be 10 8 ~10 9 / mL (for example, 10 8 / mL, 2×10 8 / mL, 5×10 8 / mL, 8×10 8 / mL or 10 9 / mL, etc.).

[0056] When the pH value of the manure to be aerated is 6.5-8.0, the bubble particle size in the micro-nano bubble water can be adjusted to 200-500nm (such as 200nm, 230nm, 260nm, 290nm, 320nm, 350nm, 380nm, 420nm, 450nm, 480nm or 500nm, etc.), and the bubble concentration can be 10 7 ~10 8 / mL (for example, 10 7 / mL, 2×10 7 / mL, 5×10 7 / mL, 8×10 7 / mL or 10 8 / mL, etc.).

[0057] When the pH value of the manure to be aerated is >8.0, the bubble particle size of the micro-nano bubble water can be adjusted to 500-1000nm (such as 500nm, 550nm, 600nm, 650nm, 700nm, 750nm, 800nm, 850nm, 900nm, 950nm or 1000nm, etc.), and the bubble concentration can be 10 6 ~10 7 / mL (for example, 10 6 / mL, 2×10 6 / mL, 5×10 6 / mL, 8×10 6 / mL or 10 7 / mL, etc.).

[0058] It should be noted that the pH value of the manure water is tested independently before each aeration treatment, and the bubble particle size and bubble concentration in the micro-nano bubble water required for the aeration treatment are independently regulated based on the measured pH value. Exemplarily, the aeration treatment may include:

[0059] After the acidification treatment is completed, the pH value of the acidified manure water is tested, and based on the measured pH value of the manure water, part of the acidified manure water is mixed with oxygen-containing gas to prepare the first micro-nano bubble water, and the bubble particle size and bubble concentration in the first micro-nano bubble water are regulated;

[0060] The first micro-nano bubble water is mixed with the remaining acidified manure water to perform a first aeration treatment;

[0061] After the first aeration treatment is completed, the fecal water is allowed to stand for a period of time, and then the pH value of the fecal water after the first aeration treatment is tested, and based on the measured pH value of the fecal water, part of the fecal water after the first aeration treatment is mixed with oxygen-containing gas to prepare a second micro-nano bubble water, and the bubble particle size and bubble concentration in the second micro-nano bubble water are regulated;

[0062] The second micro-nano bubble water is mixed with the remaining fecal water after the first aeration treatment to perform a second aeration treatment;

[0063] After the second aeration treatment is completed, the fecal water is allowed to stand for a period of time, and then the pH value of the fecal water after the second aeration treatment is tested. Based on the measured pH value of the fecal water, part of the fecal water after the second aeration treatment is mixed with oxygen-containing gas to prepare a third micro-nano bubble water, and the bubble particle size and bubble concentration in the third micro-nano bubble water are regulated;

[0064] …

[0065] After the n-1th aeration treatment is completed, the fecal water is allowed to stand for a period of time, and then the pH value of the fecal water after the n-1th aeration treatment is tested. Based on the measured pH value of the fecal water, part of the fecal water after the n-1th aeration treatment (n is an integer greater than or equal to 2) is mixed with oxygen-containing gas to prepare the nth micro-nano bubble water, and the bubble particle size and bubble concentration in the nth micro-nano bubble water are regulated;

[0066] The nth micro-nano bubble water is mixed with the remaining manure water after the n-1th aeration treatment to perform the nth aeration treatment.

[0067] In addition, it should be noted that when preparing micro-nano bubble water, the type of oxygen-containing gas used is not particularly limited, and those skilled in the art can flexibly select it according to actual needs. For example, the oxygen-containing gas may include but is not limited to oxygen, air, etc.

[0068] During the exploration process, the inventors found that micro-nano bubble water can be used to intermittently aerate the manure water after acidification treatment multiple times to increase the residence time of bubbles in the manure water, thereby reducing the aeration frequency, reducing the number of disturbances of the manure water, reducing the loss of nitrogen and phosphorus nutrients, and accelerating the harmless treatment process of the manure water; and, during the aeration treatment process, the bubble particle size and bubble concentration in the micro-nano bubble water used have a great influence on the efficiency of the harmless treatment of the manure water and the nutrient loss reduction. For manure water with different pH values, the bubble particle size and bubble concentration in the micro-nano bubble water required during the aeration treatment process are also different. Selecting micro-nano bubble water with appropriate bubble particle size and bubble concentration is beneficial to shortening the time for harmless treatment of manure water and reducing the loss of nutrients in manure water. In particular, when the pH value of the manure to be aerated is within the given range, the bubble particle size and bubble concentration in the micro-nano bubble water are regulated to meet the corresponding given range, which is beneficial to further improve the efficiency and effect of harmless treatment of manure, and reduce the loss of nutrients in manure. For example, compared with ordinary aeration, by preparing micro-nano bubble water and flexibly regulating the bubble particle size and bubble concentration in the micro-nano bubble water, the nitrogen in the manure after aeration can be reduced by more than 4%, and the phosphorus can be reduced by more than 8%. In summary, according to the method for harmlessly treating manure in the present invention, by controlling the nano bubble particle size and concentration in the micro-nano bubble water used for harmless treatment of manure to be aerated, one or more of the beneficial effects of fast manure treatment speed, low nutrient loss, good treatment effect, and good fertilizer effect can be achieved.

[0069] In some embodiments of the present invention, when the pH value of the manure to be aerated is less than 6.5, the aeration time of the aeration treatment can be adjusted to 3 to 4 minutes (such as 3.2 minutes, 3.5 minutes or 3.8 minutes, etc.); when the pH value of the manure to be aerated is 6.5 to 8.0, the aeration time of the aeration treatment can be adjusted to 2 to 3 minutes (such as 2.2 minutes, 2.5 minutes or 2.8 minutes, etc.); when the pH value of the manure to be aerated is greater than 8.0, the aeration time of the aeration treatment can be adjusted to 1 to 2 minutes (such as 1.2 minutes, 1.5 minutes or 1.8 minutes, etc.). Prolonging the aeration time is beneficial to increasing the dissolved oxygen content in the manure during the aeration treatment process, promoting the further degradation of organic matter in the manure and the process of harmless treatment of the manure. For manure to be aerated in different pH ranges, controlling the aeration time within the corresponding given range is beneficial to further improving the efficiency and effect of harmless treatment of manure and reducing the loss of nutrients in the manure.

[0070] In some embodiments of the present invention, when the pH value of the manure to be aerated is 5.5-6.5, the bubble diameter of the micro-nano bubble water can be adjusted to 10-200 nm and the bubble concentration to 108 ~10 9 / mL, aeration time is 3-4min; when the pH value of the manure to be aerated is 6.5-7, the bubble size of the micro-nano bubble water can be adjusted to 200-300nm, the bubble concentration is 10 7 ~10 8 / mL, aeration time of 2 to 3min; when the pH value of the manure to be aerated is 7.0 to 7.5, the bubble size of the micro-nano bubble water can be adjusted to 300 to 400nm, the bubble concentration is 10 7 ~10 8 / mL, aeration time is 2-3min; when the pH value of the manure to be aerated is 7.5-8, the bubble size of the micro-nano bubble water can be adjusted to 400-500nm, the bubble concentration is 10 7 ~10 8 / mL, and the aeration time is 2 to 3 minutes. This is conducive to further promoting the activation of manure water, increasing the redox reaction in manure water, and shortening the time for harmless treatment of manure water.

[0071] In some embodiments of the present invention, the method for harmlessly treating manure water may further include: testing the Ts value (i.e., Total Solids) of the manure water to be aerated, and adjusting the bubble particle size and bubble concentration in the obtained micro-nano bubble water, and the required aeration time based on the pH value and Ts value of the manure water to be aerated, wherein:

[0072] When the pH value of the manure to be aerated is less than 6.5 and the Ts value is greater than 7.5%, the bubble particle size of the micro-nano bubble water can be adjusted to 100-200nm and the bubble concentration to 10 8 ~10 9 / mL, aeration time is 3-4min;

[0073] When the pH value of the manure to be aerated is less than 6.5 and the Ts value is less than 7.5%, the bubble particle size of the micro-nano bubble water can be adjusted to 10-100nm and the bubble concentration to 10 8 ~10 9 / mL, aeration time is 3-4min;

[0074] When the pH value of the manure to be aerated is 6.5-8.0 and the Ts value is greater than 7.5%, the bubble particle size of the micro-nano bubble water can be adjusted to 200-300nm and the bubble concentration to 10 7 ~10 8 / mL, aeration time is 2 to 3 minutes;

[0075] When the pH value of the manure to be aerated is 6.5-8.0 and the Ts value is ≤7.5%, the bubble size of the micro-nano bubble water can be adjusted to 300-500nm and the bubble concentration to 10 7 ~10 8 / mL; aeration time is 2 to 3 minutes;

[0076] When the pH value of the manure to be aerated is >8.0 and the Ts value is >7.5%, the bubble particle size of the micro-nano bubble water can be adjusted to 500-700nm and the bubble concentration is 10 6 ~10 7 / mL, aeration time is 1 to 2 minutes;

[0077] When the pH value of the manure to be aerated is >8.0 and the Ts value is ≤7.5%, the bubble particle size of the micro-nano bubble water can be adjusted to 700-1000nm and the bubble concentration to 10 6 ~10 7 / mL, and the aeration time is 1 to 2 minutes.

[0078] This is beneficial to further promote the activation of manure water, increase the redox reaction in manure water, and shorten the time for harmless treatment of manure water.

[0079] In some embodiments of the present invention, the acidification treatment and / or the aeration treatment may be performed at a constant temperature.

[0080] In some embodiments of the present invention, each aeration treatment may independently include: supplying the prepared micro-nano bubble water to the manure to be aerated and then letting it stand, thereby increasing the redox reaction in the manure and shortening the time for harmless treatment of the manure.

[0081] In some embodiments of the present invention, reference Figure 1It is understood that the containing device A can be used to acidify and aerate the manure water; part of the manure water to be aerated can be supplied to the micro-nano bubble generating device B to mix with the oxygen-containing gas to prepare micro-nano bubble water; the prepared micro-nano bubble water is returned to the containing device for aeration treatment of the manure water to be aerated, wherein the bubble particle size, bubble concentration, etc. in the micro-nano bubble water to be obtained by each aeration treatment can be independently regulated by an automatic control unit (not specifically shown). Specifically: a pH sensor 6 can be provided in the containing device A; the micro-nano bubble generating device B includes a first conveying pipeline 19a, a second conveying pipeline 19b, a variable frequency water pump 23, an air pump 14, a gas flowmeter 15, a pressure detection device 18 and a gas-water mixing chamber 12, one end of the first conveying pipeline 19a is connected to the containing device A, and the other end is connected to the water inlet of the variable frequency water pump 23, and the first conveying pipeline 19a is provided with an oxygen-containing gas inlet, and the oxygen-containing gas inlet is provided on the first conveying pipeline 19a. The inlet of the body is connected to the air pump 14 through the gas flow meter 15; the air-water mixing chamber 12 includes an air-water mixture inlet and a micro-nano bubble water outlet, one end of the second delivery pipe 19b is connected to the water outlet of the variable frequency water pump 23, and the other end is connected to the air-water mixture inlet; the micro-nano bubble water outlet is connected to the containing device A, and the pressure detection device 18 is arranged on the second delivery pipe 19b; the automatic control unit is connected to the pH sensor 6, the air pump 14, the gas flow meter 15, the variable frequency water pump 23 and the pressure detection device 18, and is suitable for receiving the signal transmitted by the pH sensor 6 to obtain the pH value of the fecal water to be aerated, as well as the values ​​displayed by the gas flow meter 15 and the pressure detection device 18, and based on the pH value, regulates the start and stop, frequency and / or opening of the air pump 14 and the variable frequency water pump 23, controls the air intake of the first delivery pipe 19a and the pipe pressure of the second delivery pipe 19b, and obtains micro-nano bubble water with expected bubble particle size and expected bubble concentration. Normally, the feces and water treatment process requires human participation, and the feces and water treatment environment is poor, which affects the physical and mental health of the staff. The automatic control unit is introduced in the present invention, which can realize unmanned operation in the entire treatment process. All devices are controlled under the control of the control unit, reducing labor intensity. Further, a water flow meter 16 can also be provided on the second delivery pipeline 19b, and the other end of the second delivery pipeline 19b is connected to the gas-water mixture inlet through the water flow meter 16. Furthermore, a gas reflux pipe 20 can also be set between the first delivery pipeline 19a and the second delivery pipeline 19b, and a valve 17 is provided on the gas reflux pipe 20. When preparing micro-nano bubble water, excess gas can overflow through the gas reflux pipe 20 with a valve 17 without passing through the variable frequency water pump 23, thereby preventing the variable frequency water pump 23 from being damaged by excessive air suction due to excessive pipeline gas.

[0082] In some embodiments of the present invention, the method for harmlessly treating manure water may further include: using an automatic control unit to independently control the aeration time required for each aeration treatment, and the automatic control unit controls the aeration time required for each aeration treatment based on the pH value of the manure water. This can further realize unmanned automatic operation of the entire treatment process, increase the redox reaction in the manure water, and shorten the time for harmlessly treating the manure water.

[0083] In some embodiments of the present invention, the method for harmlessly treating manure water may also include: inputting the Ts value of the manure water to be aerated into an automatic control unit, the automatic control unit being adapted to control the start and stop, frequency and / or opening of the air pump and the variable frequency water pump based on the pH value of the manure water and the input Ts value, controlling the air intake of the first delivery pipeline and the pipeline pressure of the second delivery pipeline, and obtaining micro-nano bubble water with the expected bubble particle size and bubble concentration. This is conducive to further promoting the activation of manure water, increasing the redox reaction in the manure water, and shortening the time for harmlessly treating the manure water.

[0084] In some embodiments of the present invention, reference Figure 1 It is understood that the method for harmlessly treating manure water may also include: by adjusting the frequency of the air pump 14 and / or the variable frequency water pump 23, controlling the value displayed by the pressure detection device 18, wherein: when the pH value of the manure water to be aerated is <6.5, the value displayed by the pressure detection device 18 can be controlled to be 0.30MPa~0.32Mpa, and the flow rate displayed by the gas flow meter 15 can be controlled to be 0.4~0.6L / min; when the pH value of the manure water to be aerated is 6.5~8.0, the value displayed by the pressure detection device can be controlled to be 0.29MPa~0.30Mpa, and the flow rate displayed by the gas flow meter can be controlled to be 0.3~0.4L / min; when the pH value of the manure water to be aerated is >8.0, the value displayed by the pressure detection device can be controlled to be 0.28MPa~0.30Mpa, and the flow rate displayed by the gas flow meter can be <0.2L / min. This is further conducive to obtaining micro-nano bubble water with expected bubble particle size and bubble concentration.

[0085] In some embodiments of the present invention, the temperature of the acidification treatment and / or aeration treatment can be automatically controlled by using a temperature control device and an automatic control unit; and / or, the containing device can also be provided with a temperature sensor, and the automatic control unit can be connected to the temperature sensor and is suitable for receiving a signal transmitted by the temperature sensor to obtain the temperature of the manure water, and based on the temperature of the manure water and the preset acidification treatment temperature and / or the preset aeration treatment temperature, the start and stop and temperature control range of the temperature control device can be controlled. In this way, the acidification treatment and aeration treatment processes can be further automatically controlled to be performed at a constant temperature or a preset temperature.

[0086] In some embodiments of the present invention, the micro-nano bubble water can be returned to the containing device A, and the feces water is allowed to stand after aeration treatment. When the dissolved oxygen concentration in the feces water is lower than a preset threshold, the micro-nano bubble generating device is started again; and / or, an oxygen content sensor can also be provided in the containing device A, and the automatic control unit can be connected to the oxygen content sensor, and is suitable for receiving the signal transmitted by the oxygen content sensor to obtain the dissolved oxygen concentration of the feces water, and controlling the start and stop of the micro-nano bubble generating device based on the dissolved oxygen concentration. Optionally, the preset threshold value can be less than or equal to 0.5 mg / L, that is, when the dissolved oxygen concentration in the feces water is lower than the preset threshold value, the automatic control unit controls the micro-nano bubble generating device to start preparing micro-nano bubble water and start a new round of aeration treatment. This can further achieve intermittent and automated processing of aeration treatment. In some embodiments, the fecal water containing micro-nano bubbles can be statically stored in the containing space for a preset time (such as 15-24 hours), and then the dissolved oxygen concentration value can be observed to choose whether to turn on the micro-nano bubble generating device; or the signal transmitted by the oxygen content sensor can be received in real time to obtain the dissolved oxygen concentration of the fecal water, and the start and stop of the micro-nano bubble generating device can be controlled based on the dissolved oxygen concentration.

[0087] In some embodiments of the present invention, reference Figure 1 It is understood that the stirring device 9 can be used to stir the manure water during the acidification process, and the stirring device 9 is arranged in the containing device A. Further, the automatic control unit can be connected to the stirring device 9 and is suitable for automatically controlling the start and stop of the stirring device during the acidification stage. In this way, the acidification process of the manure water can be further promoted.

[0088] Based on the same inventive concept, in the second aspect of the present invention, a system for implementing the method for harmlessly treating fecal water according to the first aspect of the present invention is proposed (reference Figure 1 understanding), including:

[0089] The containing device A comprises a manure containing space 7, a manure outlet for aeration treatment, and a pH sensor 6. The containing device A is suitable for containing manure and performing acidification and aeration treatment on the contained manure. The pH sensor 6 is suitable for detecting the pH value of the manure contained in the containing space 7.

[0090] A micro-nano bubble generating device B, which includes a first delivery pipeline 19a, a second delivery pipeline 19b, a variable frequency water pump 23, an air pump 14, a gas flow meter 15, a pressure detection device 18 and a gas-water mixing chamber 12. One end of the first delivery pipeline 19a is connected to the accommodating device A, and the other end is connected to the water inlet of the variable frequency water pump 23. The first delivery pipeline 19a is provided with an oxygen-containing gas inlet, which is connected to the air pump 14 through the gas flow meter 15; the gas-water mixing chamber 12 includes a gas-water mixture inlet and a micro-nano bubble water outlet, one end of the second delivery pipeline 19b is connected to the water outlet of the variable frequency water pump 23, and the other end is connected to the gas-water mixture inlet; the micro-nano bubble water outlet is connected to the accommodating device A, and the pressure detection device 18 is provided on the second delivery pipeline 19b;

[0091] An automatic control unit is connected to the pH sensor 6, the air pump 14, the gas flow meter 15, the variable frequency water pump 23 and the pressure detection device 18, and is suitable for receiving the signal transmitted by the pH sensor 6 to obtain the pH value of the fecal water to be aerated, as well as the values ​​displayed by the gas flow meter 15 and the pressure detection device 18, and based on the pH value, regulating the start and stop, frequency and / or opening of the air pump 14 and the variable frequency water pump 23, controlling the air intake of the first delivery pipeline 19a and the pipeline pressure of the second delivery pipeline 19b, and obtaining micro-nano bubble water with an expected bubble particle size and an expected bubble concentration.

[0092] According to the system for harmlessly treating manure water in the present invention, it is easy to flexibly adjust the nano bubble particle size and bubble concentration in the micro-nano bubble water obtained when harmlessly treating the manure water to be aerated based on the pH value of the manure water to be aerated, thereby achieving one or more of the beneficial effects of automation of manure water treatment, fast processing speed, low nutrient loss, good processing effect, and good fertilizer efficiency. In addition, it should be noted that the relevant features and effects described for the method for harmlessly treating manure water in the first aspect of the present invention are also applicable to the system for harmlessly treating manure water, and will not be repeated here.

[0093] In some embodiments of the present invention, reference Figure 1 or Figure 2It is understood that the system for harmless treatment of manure water may also include: a temperature control device and a temperature sensor, the containing device B is provided with a temperature sensor and a hollow interlayer 8, the hollow interlayer 8 is wrapped outside the containing space 7 and is spaced from the containing space 7, the hollow interlayer 8 includes a temperature control medium inlet and a temperature control medium outlet, the temperature control medium inlet and the temperature control medium outlet are adjacent to the temperature control device, and the automatic control unit is connected to the temperature control device and the temperature sensor, and is suitable for regulating the temperature of the temperature control device and the temperature control medium based on the actual temperature of the manure water and the preset acidification treatment temperature or aeration treatment temperature, thereby regulating the temperature of the acidification treatment and / or aeration treatment. This is conducive to achieving automatic temperature control. Exemplarily, the containing device B can be made of glass, the containing device B can be supported by a bracket to leave the ground, the containing device B can be made of double-layer glass, a hollow interlayer 8 is provided in the middle, and the storage tank is provided with a water inlet 5, a water outlet 28, an air inlet, a micro-nano bubble water inlet and outlet 11, etc.

[0094] In some embodiments of the present invention, the system for harmlessly treating fecal water may also include: an oxygen content sensor. The containing device B is provided with an oxygen content sensor. The automatic control unit can be connected to the oxygen content sensor and is suitable for receiving the signal transmitted by the oxygen content sensor to obtain the dissolved oxygen concentration of the fecal water, and controlling the start and stop of the micro-nano bubble generating device based on the dissolved oxygen concentration.

[0095] In some embodiments of the present invention, the containing device B may also be provided with a sampling port 29 and a sediment outlet 31. The sampling port 29 is used to take a small portion of the fecal water sample for testing, such as testing the Ts value, etc.; the sediment outlet 31 is used to discharge the sediment in the fecal water after acidification and / or aeration treatment.

[0096] In some embodiments of the present invention, the system for harmlessly treating manure water may further include: a stirring device 9, the stirring device 9 is provided in the receiving device A, the automatic control unit may be connected to the stirring device, and is suitable for automatically controlling the start and stop of the stirring device during the acidification treatment stage. Exemplarily, the stirring device 9 may include a stirring shaft 21 and a stirring blade 30, both of which extend into the interior of the receiving space 7.

[0097] In some embodiments of the present invention, the system for harmlessly treating manure water may further include: an editable display 10, the automatic control unit may include an editable display, and the editable display may be used to select control parameters for harmlessly treating manure water and / or edit control parameters for harmlessly treating manure water.

[0098] In some embodiments of the present invention, the automatic control unit can preset multiple processing programs. The automatic control unit can obtain relevant information based on the signals fed back by multiple sensors and automatically select a preset processing operation program. For example, it can automatically select a control program based on the pH value of the manure water to be aerated, thereby automatically adjusting the parameters.

[0099] In some embodiments of the present invention, reference Figure 2 It is understood that the automatic control unit may include a control cabinet 10, which may be rectangular and mainly include a display screen and buttons. The display screen may be a touch screen, and the automatic control unit is connected to the containing device, the micro-nano bubble generating device and the temperature control device. Each device may be provided with a plurality of independent channels, which may control the independent opening and closing of each water pump and air pump, respectively. The automatic control unit may be controlled according to the signal fed back by the sensor, and the control cabinet may set different control channels according to different pH values ​​and Ts values ​​of the fecal water, and realize automatic adjustment of parameters.

[0100] In summary, the method or system for harmlessly treating sewage in the above embodiments of the present invention may have one or more of the following beneficial effects:

[0101] (1) The entire processing process can be completely unmanned, and all devices can be controlled by an automatic control unit, which can reduce labor intensity.

[0102] (2) It can achieve temperature regulation and increase environmental adaptability.

[0103] (3) In the present invention, micro-nano bubbles are introduced into the manure water, which increases the residence time of the bubbles in the manure water, thereby reducing the aeration frequency, reducing the number of disturbances of the manure water, and reducing the loss of nitrogen and phosphorus nutrients. Compared with ordinary aeration, the nitrogen loss of manure water can be reduced by more than 4%, and the phosphorus loss can be reduced by more than 8% after nanobubble treatment.

[0104] (4) In the present invention, micro-nano bubbles are introduced into the fecal water, which promotes the activation of the fecal water, increases the redox reaction in the water, and shortens the harmless treatment time. Compared with ordinary aeration, the fecal coliform group in the fecal water can be completely harmless in about 30 days after nanobubble treatment, which is 90 days shorter than ordinary aeration and 150 days shorter than no aeration. Compared with ordinary aeration and no aeration, nanobubble aeration reduces nitrogen loss by 25.6% and 12.9%, respectively; phosphorus loss by 13.6% and 10.2%, respectively; potassium loss by 4.2% and 9.5%, respectively.

[0105] (5) The present invention can treat manure water with different Ts concentrations by controlling the concentration and particle size of micro-nano bubbles, and has wider applicability.

[0106] (6) When treating manure water, automatic manure water harmless treatment and nutrient loss reduction can be completed at one time, which is of great significance for solving the environmental pollution of livestock and poultry manure water and fertilizer utilization.

[0107] The scheme of the present invention will be explained below in conjunction with the embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Where specific techniques or conditions are not indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used are not indicated by the manufacturer and are all conventional products that can be obtained commercially.

[0108] Example 1

[0109] The manure water in the breeding house after solid-liquid separation is filtered by a mesh filter. Figure 2 The filtered fecal water enters the water inlet tank 1 for temporary storage. At this time, the water inlet pump 2 is started, and the fecal water enters the containing space 7 through the water inlet pipe 3, the flow meter 4 and the inlet 5 of the containing device.

[0110] In order to further obtain manure water with higher nutrients, the manure water is acidified. After the manure water enters the containing space 7, an acidifier is added to the containing space 7. The acidifier mainly includes H 2 SO 4 , alum, FeSO 4 After the manure is acidified, the motor of the stirring device 9 is started, and the stirring motor drives the stirring shaft 21, and the stirring shaft 21 has a stirring blade 30, and the stirring blade 30 rotates to mix the acidifier and the manure evenly.

[0111] The acidified manure water is aerated with micro-nano bubbles. After the manure water and the acidifier are evenly mixed in the storage tank 7, the variable frequency water pump 23 of the micro-nano generating device is started. At this time, the control cabinet 10 can select a control program according to the pH value of the manure water fed back by the pH sensor. Each control program is set with independent process parameters to adjust the particle size and concentration of nano bubbles in the prepared micro-nano bubble water.

[0112] The feces in the accommodating space 7 enters the first delivery pipeline 19a through the water outlet 22. At this time, the air pump 14 of the micro-nano bubble generating device is turned on, and the gas enters the feces in the first delivery pipeline 19a through the pipeline of the gas flowmeter 15. In order to prevent the variable frequency water pump 23 from being damaged by excessive air suction due to the excessive gas in the pipeline, the excess gas overflows through the gas return pipe 20 with a valve 17 without passing through the variable frequency water pump 23. The feces and gas flow in the second delivery pipeline 19b, and the water flow pressure and flow rate can be read by the pressure detection device 18 and the water flow meter 16, so as to judge the particle size and concentration of the generated micro-nano bubbles. The water flow and gas enter the air-water mixing chamber 12 through the throttle port 13, and the throttle port 13 is conical. The water vapor pressure flows through the throttle port 13, and the pressure increases. The water vapor is hit to the wall of the air-water mixing chamber to form micro-nano bubble water.

[0113] The control cabinet controls the output pressure of the variable frequency water pump 23 according to the pressure detection device 18 on the nano bubble system, and the pipeline pressure of the second delivery pipeline 19b is controlled at 0.28-0.32MPa; the air pump flow rate is adjusted to 0.3-0.5L / min.

[0114] The water in the containing device circulates through the micro-nano bubble generating device and then returns to the containing space 7 .

[0115] A water tank is used as a temperature control device. The water tank can control the water temperature according to the ambient temperature, pour water of appropriate temperature into the hollow interlayer 8 of the containing device, and circulate the constant temperature water in the interlayer to keep the water in the containing space 7 at a suitable temperature. The temperature of the manure water is detected by the temperature sensor in the receiving tank.

[0116] The fecal water containing micro-nano bubbles is statically stored in the containing space. When the dissolved oxygen concentration in the fecal water is lower than 0.5 mg / L, the control system 10 automatically controls the micro-nano bubble generating device to start circulating.

[0117] After 30 days of treatment, the treated fecal water was subjected to relevant tests.

[0118] After that, the water pump 26 is started, and the fecal water in the accommodation space 7 enters the outlet pipe 25 with the flow meter 24 through the outlet 28, and finally enters the outlet tank 27, and the solid sediment is discharged through the sediment outlet 31.

[0119] The difference between Examples 1 to 3 and Comparative Examples 1 to 7 is the aeration treatment. The procedures for the related aeration treatment control are as follows:

[0120] Control program 1:

[0121] When the pH value of the manure to be aerated is less than 6.5, the bubble diameter of the micro-nano bubble water is adjusted to 100-200nm and the bubble concentration is 10 8 ~10 9 / mL, aeration time is 3min;

[0122] When the pH value of the manure to be aerated is 6.5-8.0, the bubble size of the micro-nano bubble water is adjusted to 200-500nm and the bubble concentration is 10 7 ~10 8 / mL, aeration time is 2min;

[0123] When the pH value of the manure to be aerated is >8.0, the bubble size of the micro-nano bubble water is adjusted to 500-1000nm and the bubble concentration is 10 6 ~10 7 / mL, and the aeration time was 1min.

[0124] Control Program 2:

[0125] When the pH value of the manure to be aerated is less than 6.5, the bubble diameter of the micro-nano bubble water is adjusted to 100-200nm and the bubble concentration is 10 8 ~10 9 / mL, aeration time is 4min;

[0126] When the pH value of the manure to be aerated is 6.5-8.0, the bubble size of the micro-nano bubble water is adjusted to 200-500nm and the bubble concentration is 10 7 ~10 8 / mL, aeration time is 3min;

[0127] When the pH value of the manure to be aerated is >8.0, the bubble size of the micro-nano bubble water is adjusted to 500-1000nm and the bubble concentration is 10 6 ~10 7 / mL, and the aeration time was 2min.

[0128] Control Program 3:

[0129] When the pH value of the manure to be aerated is less than 6.5, the bubble diameter of the micro-nano bubble water is adjusted to 100-200nm and the bubble concentration is 10 8 ~10 9 / mL, aeration time is 2min;

[0130] When the pH value of the manure to be aerated is 6.5-8.0, the bubble size of the micro-nano bubble water is adjusted to 200-500nm and the bubble concentration is 10 7 ~10 8 / mL, aeration time is 2min;

[0131] When the pH value of the manure to be aerated is >8.0, the bubble size of the micro-nano bubble water is adjusted to 500-1000nm and the bubble concentration is 10 6 ~10 7 / mL, and the aeration time was 2min.

[0132] Control Program 4:

[0133] The bubble size of the micro-nano bubble water is 200-500nm and the bubble concentration is 10 7 ~10 8 / mL, and the aeration time was 2min.

[0134] Control Program 5:

[0135] The bubble size of the micro-nano bubble water is 500-1000nm and the bubble concentration is 10 6 ~10 7 / mL, and the aeration time was 2min.

[0136] Control Program 6:

[0137] When the pH value of the manure to be aerated is less than 6.5, the bubble diameter of the micro-nano bubble water is adjusted to 200-500nm and the bubble concentration is 10 8 ~10 9 / mL, aeration time is 3min;

[0138] When the pH value of the manure to be aerated is 6.5-8.0, the bubble size of the micro-nano bubble water is adjusted to 500-1000nm and the bubble concentration is 10 7 ~10 8 / mL, aeration time is 2min;

[0139] When the pH value of the manure to be aerated is >8.0, the bubble size of the micro-nano bubble water is adjusted to 1500-2000nm and the bubble concentration is 10 6 ~10 7 / mL, and the aeration time was 1min.

[0140] Control Program 7:

[0141] When the pH value of the manure to be aerated is less than 6.5, the bubble diameter of the micro-nano bubble water is adjusted to 100-200nm and the bubble concentration is 10 6 ~10 7 / mL, aeration time is 3min;

[0142] When the pH value of the manure to be aerated is 6.5-8.0, the bubble size of the micro-nano bubble water is adjusted to 200-500nm and the bubble concentration is 10 5 ~10 6 / mL, aeration time is 2min;

[0143] When the pH value of the manure to be aerated is >8.0, the bubble size of the micro-nano bubble water is adjusted to 500-1000nm and the bubble concentration is 10 4 ~10 5 / mL, and the aeration time was 1min.

[0144] Control Program 8:

[0145] Ordinary aeration: After adding acidifier to the manure water, use ordinary air pump and aeration plate to aerate the manure water for 3 minutes every 24 hours without any other treatment.

[0146] Control Program 9:

[0147] No aeration: Add acidifier to the manure water and let it stand without any other treatment.

[0148] The aeration procedures of Examples 1 to 3 and Comparative Examples 1 to 6 were control procedures 1 to 9, and the test results of 30 days of treatment are shown in Table 1; Figures 3 to 6 A comparison chart showing the fecal coliform group, COD value, total nitrogen content and cumulative ammonia emissions in the fecal water of Example 2, Comparative Example 5 and Comparative Example 6 as the treatment time changes.

[0149] Aeration procedures and related test results of Examples 1 to 3 and Comparative Examples 1 to 6

[0150]

[0151]

[0152] Conclusion: Combining Examples 1 to 3, Comparative Examples 1 to 6 and Table 1 and Figures 3 to 6 It can be seen that the aeration procedure of the above embodiment of the present invention is used to aerate the manure water. After the treatment, the conductivity and COD value of the manure water are low, the number of fecal coliform bacteria is relatively small, and the floating range of the cumulative emission of ammonia is acceptable, indicating that the aeration method of the above embodiment of the present invention has a better comprehensive effect on the harmless treatment of manure water.

[0153] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0154] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for harmlessly treating fecal water, characterized in that: include: (1) Acidification of fecal water; (2) aerating the acidified manure water multiple times intermittently, wherein each aeration treatment independently comprises: Mixing part of the manure water to be aerated with oxygen-containing gas to prepare micro-nano bubble water, and adjusting the bubble particle size and bubble concentration in the obtained micro-nano bubble water based on the pH value of the manure water to be aerated; The prepared micro-nano bubble water is used to perform aeration treatment on the manure water to be aerated. in: When the pH value of the manure to be aerated is less than 6.5, the bubble diameter of the micro-nano bubble water is adjusted to be less than 200 nm and the bubble concentration is 10 8 ~10 9 Pieces / mL; When the pH value of the manure to be aerated is 6.5-8.0, the bubble particle size of the micro-nano bubble water is adjusted to be 200-500nm and the bubble concentration is 10 7 ~10 8 Pieces / mL; When the pH value of the manure to be aerated is greater than 8.0, the bubble particle size of the micro-nano bubble water is adjusted to be 500-1000nm and the bubble concentration is 10 6 ~10 7 Pieces / mL.

2. The method according to claim 1, characterized in that When the pH value of the manure to be aerated is less than 6.5, the aeration time of the aeration treatment is adjusted to 3 to 4 minutes; When the pH value of the manure to be aerated is 6.5-8.0, the aeration time of the aeration treatment is adjusted to 2-3 minutes; When the pH value of the manure to be treated by aeration is greater than 8.0, the aeration time of the aeration treatment is adjusted to 1 to 2 minutes.

3. The method according to claim 1, characterized in that When the pH value of the manure to be aerated is 5.5-6.5, the bubble diameter of the micro-nano bubble water is adjusted to be 10-200 nm and the bubble concentration is 10 8 ~10 9 / mL, aeration time is 3-4min; When the pH value of the manure to be aerated is 6.5-7, the bubble particle size of the micro-nano bubble water is adjusted to be 200-300nm and the bubble concentration is 10 7 ~10 8 / mL, aeration time is 2 to 3 minutes; When the pH value of the manure to be aerated is 7.0-7.5, the bubble diameter of the micro-nano bubble water is adjusted to 300-400 nm and the bubble concentration is 10 7 ~10 8 / mL, aeration time is 2 to 3 minutes; When the pH value of the manure to be aerated is 7.5-8, the bubble particle size of the micro-nano bubble water is adjusted to be 400-500nm and the bubble concentration is 10 7 ~10 8 / mL, aeration time is 2 to 3 minutes.

4. The method according to claim 1, characterized in that: Also includes: The Ts value of the manure to be aerated is tested, and based on the pH value and Ts value of the manure to be aerated, the bubble particle size and bubble concentration in the obtained micro-nano bubble water, as well as the required aeration time are adjusted, wherein: When the pH value of the manure to be aerated is less than 6.5 and the Ts value is greater than 7.5%, the bubble particle size of the micro-nano bubble water is adjusted to be 100-200nm and the bubble concentration is 10 8 ~10 9 / mL, aeration time is 3-4min; When the pH value of the manure to be aerated is less than 6.5 and the Ts value is less than 7.5%, the bubble particle size of the micro-nano bubble water is adjusted to be 10-100nm and the bubble concentration is 10 8 ~10 9 / mL, aeration time is 3-4min; When the pH value of the manure to be aerated is 6.5-8.0 and the Ts value is greater than 7.5%, the bubble particle size of the micro-nano bubble water is adjusted to be 200-300nm and the bubble concentration is 10 7 ~10 8 / mL, aeration time is 2 to 3 minutes; When the pH value of the manure to be aerated is 6.5-8.0 and the Ts value is ≤7.5%, the bubble particle size of the micro-nano bubble water is adjusted to be 300-500nm and the bubble concentration is 10 7 ~10 8 / mL; aeration time is 2 to 3 minutes; When the pH value of the manure to be aerated is greater than 8.0 and the Ts value is greater than 7.5%, the bubble particle size of the micro-nano bubble water is adjusted to be 500-700 nm and the bubble concentration is 10 6 ~10 7 / mL, aeration time is 1 to 2 minutes; When the pH value of the manure to be aerated is greater than 8.0 and the Ts value is less than or equal to 7.5%, the bubble particle size of the micro-nano bubble water is adjusted to be 700-1000nm and the bubble concentration is 10 6 ~10 7 / mL, aeration time is 1 to 2 minutes.

5. The method according to claim 1, characterized in that: The acidification treatment includes a stirring operation; and / or, The acidification treatment and / or the aeration treatment are carried out at a constant temperature; and / or, Each aeration treatment independently comprises: supplying the prepared micro-nano bubble water to the manure water to be aerated and then letting it stand.

6. The method according to any one of claims 1 to 5, characterized in that: Using a containing device to perform the acidification treatment and the aeration treatment on the sewage; Supplying part of the fecal water to be aerated to a micro-nano bubble generating device and mixing it with oxygen-containing gas to prepare micro-nano bubble water; The prepared micro-nano bubble water is returned to the containing device to aerate the fecal water to be aerated, The bubble diameter and bubble concentration in the micro-nano bubble water to be obtained by each aeration treatment are independently regulated by an automatic control unit: A pH sensor is provided in the containing device; The micro-nano bubble generating device comprises a first delivery pipeline, a second delivery pipeline, a variable frequency water pump, an air pump, a gas flow meter, a pressure detection device and a gas-water mixing chamber, wherein one end of the first delivery pipeline is connected to the containing device, and the other end is connected to the water inlet of the variable frequency water pump, and an oxygen-containing gas inlet is provided on the first delivery pipeline, and the oxygen-containing gas inlet is connected to the air pump through a gas flow meter; the gas-water mixing chamber comprises a gas-water mixture inlet and a micro-nano bubble water outlet, one end of the second delivery pipeline is connected to the water outlet of the variable frequency water pump, and the other end is connected to the gas-water mixture inlet; the micro-nano bubble water outlet is connected to the containing device, and the pressure detection device is provided on the second delivery pipeline; The automatic control unit is connected to the pH sensor, the air pump, the gas flow meter, the variable frequency water pump and the pressure detection device, and is suitable for receiving the signal transmitted by the pH sensor to obtain the pH value of the fecal water to be aerated, as well as the values ​​displayed by the gas flow meter and the pressure detection device, and based on the pH value, regulating the start and stop, frequency and / or opening of the air pump and the variable frequency water pump, controlling the air intake volume of the first delivery pipeline and the pipeline pressure of the second delivery pipeline, and obtaining micro-nano bubble water with expected bubble particle size and expected bubble concentration.

7. The method according to claim 6, characterized in that Also includes: The automatic control unit is used to independently control the aeration time required for each aeration treatment, and the automatic control unit controls the aeration time required for each aeration treatment based on the pH value; and / or, The Ts value of the manure to be aerated is input into the automatic control unit, and the automatic control unit is suitable for regulating the start and stop, frequency and / or opening of the air pump and the variable frequency water pump based on the pH value and the input Ts value, controlling the air intake of the first delivery pipeline and the pipeline pressure of the second delivery pipeline, and obtaining micro-nano bubble water with expected bubble particle size and bubble concentration; and / or, By adjusting the frequency of the air pump and / or the variable frequency water pump, the value displayed by the pressure detection device is controlled, wherein: when the pH value of the manure to be aerated is <6.5, the value displayed by the pressure detection device is controlled to be 0.30MPa~0.32Mpa, and the flow rate displayed by the gas flowmeter is 0.4~0.6L / min; when the pH value of the manure to be aerated is 6.5~8.0, the value displayed by the pressure detection device is controlled to be 0.29MPa~0.30Mpa, and the flow rate displayed by the gas flowmeter is 0.3~0.4L / min; when the pH value of the manure to be aerated is >8.0, the value displayed by the pressure detection device is controlled to be 0.28MPa~0.30Mpa, and the flow rate displayed by the gas flowmeter is <0.2L / min.

8. The method according to claim 6, characterized in that At least one of the following three conditions is met: (1) automatically controlling the treatment temperature of the acidification treatment and / or the aeration treatment by using a temperature control device and an automatic control unit; and / or, The containing device is further provided with a temperature sensor, and the automatic control unit is connected to the temperature sensor and is adapted to receive a signal transmitted by the temperature sensor to obtain the temperature of the manure water, and control the start and stop and the temperature control range of the temperature control device based on the temperature of the manure water and a preset acidification treatment temperature and / or a preset aeration treatment temperature; (2) returning the micro-nano bubble water to the containing device, allowing the feces to stand after aeration treatment, and restarting the micro-nano bubble generating device when the dissolved oxygen concentration in the feces is lower than a preset threshold; and / or, An oxygen content sensor is also provided in the containing device, and the automatic control unit is connected to the oxygen content sensor and is suitable for receiving a signal transmitted by the oxygen content sensor to obtain the dissolved oxygen concentration of the manure water, and controlling the start and stop of the micro-nano bubble generating device based on the dissolved oxygen concentration; and / or, The preset threshold is less than or equal to 0.5 mg / L; (3) using a stirring device to stir the manure water during the acidification process, wherein the stirring device is arranged in the containing device; and / or, The automatic control unit is connected to the stirring device and is suitable for automatically controlling the start and stop of the stirring device during the acidification treatment stage.

9. A system for implementing the method according to any one of claims 1 to 8, characterized in that: include: A containing device, the containing device having a manure containing space, a manure outlet to be aerated, and a pH sensor, the containing device is suitable for containing manure and performing acidification and aeration treatment on the contained manure, and the pH sensor is suitable for detecting the pH value of the manure contained in the containing space; A micro-nano bubble generating device, the micro-nano bubble generating device comprising a first delivery pipeline, a second delivery pipeline, a variable frequency water pump, an air pump, a gas flow meter, a pressure detection device and a gas-water mixing chamber, one end of the first delivery pipeline is connected to the outlet of the manure water to be aerated, and the other end is connected to the water inlet of the variable frequency water pump, the first delivery pipeline is provided with an oxygen-containing gas inlet, and the oxygen-containing gas inlet is connected to the air pump through a gas flow meter; the gas-water mixing chamber comprises an air-water mixture inlet and a micro-nano bubble water outlet, one end of the second delivery pipeline is connected to the water outlet of the variable frequency water pump, and the other end is connected to the air-water mixture inlet; the micro-nano bubble water outlet is connected to the accommodating space, and the pressure detection device is arranged on the second delivery pipeline; An automatic control unit, the automatic control unit is connected to the pH sensor, the air pump, the gas flow meter, the variable frequency water pump and the pressure detection device, and is suitable for receiving the signal transmitted by the pH sensor to obtain the pH value of the fecal water to be aerated, as well as the values ​​displayed by the gas flow meter and the pressure detection device, and based on the pH value, regulating the start and stop, frequency and / or opening of the air pump and the variable frequency water pump, controlling the air intake of the first delivery pipeline and the pipeline pressure of the second delivery pipeline, and obtaining micro-nano bubble water with expected bubble particle size and expected bubble concentration.

10. The system according to claim 9, characterized in that Also includes: A temperature control device and a temperature sensor, the accommodating device is provided with the temperature sensor and a hollow interlayer, the hollow interlayer is wrapped outside the accommodating space and is spaced apart from the accommodating space, the hollow interlayer comprises a temperature control medium inlet and a temperature control medium outlet, the temperature control medium inlet and the temperature control medium outlet are adjacent to the temperature control device, the automatic control unit is connected to the temperature control device and the temperature sensor, and is suitable for regulating the temperature of the temperature control device and the temperature control medium based on the actual temperature of the manure and the preset acidification treatment temperature or aeration treatment temperature, thereby regulating the temperature of the acidification treatment and / or aeration treatment; and / or, An oxygen content sensor is provided in the containing device, the automatic control unit is connected to the oxygen content sensor, and is suitable for receiving the signal transmitted by the oxygen content sensor to obtain the dissolved oxygen concentration of the manure water, and controlling the start and stop of the micro-nano bubble generating device based on the dissolved oxygen concentration; and / or, A stirring device, wherein the containing device is provided with the stirring device, and the automatic control unit is connected to the stirring device and is suitable for automatically controlling the start and stop of the stirring device during the acidification treatment stage; An editable display, the automatic control unit includes the editable display, and the editable display is used to select control parameters for harmless treatment of manure water and / or edit control parameters for harmless treatment of manure water.

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