CN109704437B - Method for treating cow dung fermentation biogas slurry by microwave/hydrogen peroxide - Google Patents
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Abstract
The invention discloses a method for treating cow dung fermentation biogas slurry by microwave/hydrogen peroxide, and relates to the field of microwave/hydrogen peroxide process pretreatment of cow dung fermentation biogas slurry. The invention aims to solve the technical problems that the conventional cow dung methane liquid is large in volume and difficult to treat. The method comprises the following steps: firstly, preheating biogas slurry through a microwave reactor; and secondly, performing microwave/hydrogen peroxide treatment. The method has the advantages of simple operation, reduced energy consumption, shortened oxidation time, reduced cost and reduced subsequent treatment load. The invention is used for improving the settling property of solid particles of the biogas slurry, reducing the concentration of pollutants in the supernatant and reducing the load for the subsequent treatment of the supernatant.
Description
Technical Field
The invention relates to the field of microwave/hydrogen peroxide process pretreatment of cow dung fermented biogas slurry.
Background
Biogas engineering is used for treating livestock and poultry manure, an energy recycling technology is rapidly developed in recent years, and the best treatment mode is field fertilization when biogas slurry generated by anaerobic fermentation meets application conditions. However, the periphery of biogas projects of most farms does not have enough land available for digestion, and part of biogas slurry heavy metals exceed the standard, so that serious environmental problems can be caused by direct agriculture. Meanwhile, the odor released by the biogas slurry may include inorganic substances such as hydrogen sulfide and a large amount of extremely complex volatile odor organic substances, and the odor substances can stimulate the respiratory tract of a human body and influence the physiological functions of the liver and the kidney of the human body, so that judgment and memory are reduced, even some substances have carcinogenic effects, and the difficulty in treating the biogas slurry in the farm is increased.
Compared with other animal wastes, the cow dung anaerobic fermentation methane has low yield, low proportion of fermentable components, low gas production efficiency and poor utilization rate of fermentation equipment, and particularly in alpine regions, the method must maintain the temperature and the fermentation speed of a fermentation systemEnough heat must be provided for the system, and the operation effect is limited. Although anaerobic digestion can remove a large amount of soluble organic matter from high concentration organic wastewater, the anaerobic digestion solution still contains a considerable amount of organic contaminants, BOD5The biogas slurry has low COD, poor biodegradability, unreasonable C/N/P, high ammonia nitrogen and TP concentrations, belongs to high-concentration organic wastewater, contains a large amount of black brown high-molecular humic acid, makes the color of the biogas slurry look very dark and obviously reduces the transmittance. In addition, the solid colloid content of the biogas slurry is high, the settleability is poor, the solid-liquid separation is difficult, and the subsequent treatment is very difficult, so that an effective treatment method of the biogas slurry is urgently needed to be found, the settleable performance of the biogas slurry is realized, the concentration of pollutants in supernatant is reduced, and the load of the subsequent treatment is reduced.
Disclosure of Invention
The invention provides a method for treating cow dung fermentation biogas slurry by microwave/hydrogen peroxide, aiming at solving the technical problems that the conventional cow dung biogas slurry is large in amount and difficult to treat.
A method for treating cow dung fermentation biogas slurry by microwave/hydrogen peroxide specifically comprises the following steps:
firstly, preheating stage: preheating biogas slurry to 40-50 ℃ through a microwave reactor;
II, microwave/hydrogen peroxide treatment: adjusting the pH value of the biogas slurry treated in the step one to 3 by adopting inorganic acid, and then adding H2O2And putting the mixture into a microwave condition, stirring the mixture simultaneously for 4-5 min, closing a microwave source, taking the mixture out, and standing the mixture for 1-1.5 h at normal temperature to finish the method for treating the cow dung fermentation biogas slurry by using the microwave/hydrogen peroxide.
Further, the method for treating the cow dung fermentation biogas slurry by using the microwave/hydrogen peroxide is completed by using a microwave catalytic oxidation precipitation device system, wherein the microwave catalytic oxidation precipitation device system comprises a water inlet pool, a microwave reactor, a precipitation pool, a water outlet pipe, a bubble remover and a support; the water inlet pool is communicated with a water inlet of the microwave reactor through a pipeline, the bracket is arranged below the microwave reactor, and the microwave reactor comprises a magnetic stirrer, a metal shell, a cylindrical glass inner cavity, a microwave emitter and a waveguide tube; the lower part of the cylindrical glass inner cavity is arranged in the metal shell, the bottom of the cylindrical glass inner cavity is provided with a magnetic stirrer, and the upper part of the cylindrical glass inner cavity is arranged above the metal shell; the area between the cylindrical glass inner cavity and the metal shell is a hollow interlayer, the microwave emitter is arranged in the hollow interlayer, the transmitting end of the microwave emitter is connected with the input end of the waveguide tube, and the output end of the waveguide tube is connected with the outer wall of the cylindrical glass inner cavity; a drug feeding port is arranged on one side of the upper part of the cylindrical glass inner cavity, and a microwave reactor water outlet is arranged on the other side of the upper part of the cylindrical glass inner cavity; the top of the cylindrical glass inner cavity is provided with a foam collecting port; a foam outlet of the foam collecting port is communicated with a foam inlet of a foam remover through a pipeline, a water outlet of the foam remover is communicated with a water inlet of a sedimentation tank through a pipeline, a water outlet of the microwave reactor is communicated with a water inlet of the sedimentation tank through a pipeline, and the sedimentation tank is provided with a water outlet pipe;
the method for treating the cow dung fermentation biogas slurry by using the microwave/hydrogen peroxide through the microwave catalytic oxidation precipitation device system comprises the following steps:
the cow dung fermentation biogas slurry is filled into a water inlet pool, is lifted by a pump and is conveyed into a microwave reactor for preheating, the preheating is carried out to 40-50 ℃, inorganic acid is added to adjust the pH value to 3, and then the pH value is adjusted according to H2O2H is added with the mass ratio of the total solid content TS of the biogas slurry to the total solid content TS of the biogas slurry being 0.42O2Keeping the microwave condition, stirring by using a magnetic stirrer, controlling the stirring speed to be 300r/min, and keeping for 4-5 min to obtain oxidized cow dung fermented biogas slurry; and then outputting the oxidized cow dung fermentation biogas slurry from a water outlet of the microwave reactor, removing bubbles generated by the reaction through a foam collecting port through a bubble remover, allowing liquid with bubbles removed by the bubble remover to enter a sedimentation tank through a pipeline, allowing the liquid treated by the microwave reactor to enter the sedimentation tank through a water outlet of the microwave reactor through a pipeline, and discharging the liquid through a water outlet pipe, wherein the sedimentation time of the liquid in the sedimentation tank is 1-1.5 h.
The principle is as follows:
as the cow dung fermentation biogas slurry contains high-concentration organic components mainly including fatty acid, humus, complex carbohydrate and the like, and also contains a large amount of extremely complex volatile malodorous organic matters, the substances which are difficult to degrade cannot be degraded by the conventional treatment method, a method for degrading the organic components by using the cow dung fermentation biogas slurry is neededThe oxidant with strong oxidizing power oxidizes the waste water. Since microwave irradiation technology has been rapidly developed due to its advantages of being clean, fast and easy to handle, the present invention couples microwaves with hydrogen peroxide (MW-H)2O2) Proper microwave radiation causes accelerated motion and mutual collision of negatively charged particles under the action of a high-frequency electromagnetic field, so that the internal structure of the biogas slurry is destabilized. In addition, the high temperature conditions favor H2O2Whereas microwave radiation favors H2O2Hydroxyl free radicals with extremely strong oxidizing ability are generated, and the oxidation process is strengthened. By catalysis with microwaves, H2O2Can realize the stable conversion of OH, and the organic matter is easy to combine with OH to promote the removal of COD. Due to the addition of H only2O2An oxidizing agent, the process avoiding Fe2+The secondary pollution and the sludge generation have the potential advantages of overcoming the defects of the traditional Fenton process.
Because a large amount of flocculent foam can be generated by directly adding acid into the biogas slurry to adjust the pH value under the normal temperature condition, and the risk of overflow can be generated if the acid is not effectively controlled in time, the biogas slurry needs to be preheated first, which is beneficial to reducing bubbles; the invention uses the waste heat after the treatment of the microwave reactor as a heat source, thereby greatly saving the energy consumption.
H2O2Stability is greatly influenced by pH and H is generated under acidic condition2O2Is stable and is active and easy to decompose under alkaline conditions, and inorganic acid is added to adjust the pH value, thereby being beneficial to improving the settling property of the biogas slurry. The stronger the acidity, the weaker the electronegativity of the surface of the treated colloidal particles, which reduces the electrostatic repulsion among the colloidal particles and promotes the flocculation and aggregation of the released high molecular organic matters such as protein, polysaccharide and the like. The invention adopts concentrated sulfuric acid to adjust the pH, the concentrated sulfuric acid added at first mainly plays a role in dehydration and carbonization, and the first reaction is as follows because of the high COD content in the biogas slurry, the polysaccharide is decomposed into micromolecular monosaccharide after anaerobic fermentation, and the concentrated sulfuric acid has dehydration property:
in addition, the cow dung biogas slurry contains a large amount of lignin and cellulose, concentrated sulfuric acid can dehydrate a plurality of organic compounds (particularly saccharides such as cellulose, cane sugar and the like), hydrogen atoms and oxygen atoms in organic molecules are abstracted according to the ratio of the number of hydrogen atoms to the number of oxygen atoms in water molecules (2: 1), when the concentrated sulfuric acid is mixed with the cane sugar, the concentrated sulfuric acid mainly plays a role in dehydration, simultaneously the concentrated sulfuric acid oxidizes free carbon to generate carbon dioxide, the carbon dioxide is reduced by the carbon dioxide to generate sulfur dioxide, and the water is evaporated by heat generated during reaction. These actions expand the volume of the carbon produced after dehydration of the organic matter and make it porous. Subsequently, the concentrated sulfuric acid is diluted as water is produced and a large amount of heat is emitted, and the carbon produced reacts with the hot concentrated sulfuric acid:
C+2H2SO4→CO2↑+2SO2↑+2H2O
in addition, the added sulfate ions and reactants are easy to scale, such as calcium sulfate, magnesium sulfate and the like, and the added sulfate ions and reactants become precipitates, so that the settling property of the biogas slurry is also improved to a great extent. The subsequent sulfuric acid, which acts mainly as an acid, effects a pH adjustment, raising the OH redox potential (E)0) And the reaction treatment effect is improved.
The invention has the beneficial effects that:
firstly, the operation is simple: the reaction temperature adopted by the invention is low (<100 ℃), and the method can be realized by opening the environment under normal pressure without a high-temperature high-pressure system; the hydrogen peroxide used in the present invention is convenient to transport and does not require on-site preparation (e.g., ozone in an ozone advanced oxidation process requires on-site preparation). Secondly, reducing energy consumption: in the invention, the preheating step is carried out by using the waste heat after microwave radiation, thereby greatly reducing the energy consumption. Thirdly, the oxidation time is shortened, and the cost is reduced: the microwave heating device adopts microwave heating, the heating effect is different from a heat conduction and convection mode, and the energy is converted into the energy for heating substance molecules, so the required time is approximately instant, the aim of quick heating can be achieved, heat loss caused by long-time heating is avoided, the microwave heating device is an energy-saving heating mode, the heating selectivity is good, the pyrolysis is quick, the treatment efficiency is high, and the treatment effect is good. Fourthly, reducing subsequent processing load: the load of subsequent biological treatment is reduced due to the function of pretreatment. The biological treatment adopts anaerobic biological treatment, the sludge yield is low, the required energy consumption is low, and energy-derived gas methane can be generated, and the effective combination of the two processes ensures that the water quality of the total treated effluent reaches the standard and is stable, so that the treatment requirement of recycling is met.
Through tests, the COD concentration of the cow dung fermentation biogas slurry after microwave/hydrogen peroxide treatment is 7536mg/L, the COD removal rate reaches 68%, the sedimentation ratio is reduced to 38% during solid-liquid separation, and the treated cow dung fermentation biogas slurry is clear and transparent.
The invention is used for improving the settling property of solid particles of the biogas slurry, reducing the concentration of pollutants in the supernatant and reducing the load for the subsequent treatment of the supernatant.
Drawings
FIG. 1 is a schematic structural diagram of a microwave catalytic oxidation and precipitation apparatus system according to the first embodiment.
Detailed Description
The technical solution of the present invention is not limited to the specific embodiments listed below, and includes any combination of the specific embodiments.
The first embodiment is as follows: the embodiment provides a method for treating cow dung fermentation biogas slurry by microwave/hydrogen peroxide, which specifically comprises the following steps:
firstly, preheating stage: preheating biogas slurry to 40-50 ℃ through a microwave reactor;
II, microwave/hydrogen peroxide treatment: adjusting the pH value of the biogas slurry treated in the step one to 3 by adopting inorganic acid, and then adding H2O2And putting the mixture into a microwave condition, stirring the mixture simultaneously for 4-5 min, closing a microwave source, taking the mixture out, and standing the mixture for 1-1.5 h at normal temperature to finish the method for treating the cow dung fermentation biogas slurry by using the microwave/hydrogen peroxide.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: in the first step, the power of the microwave reactor is 300W. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: in the second step, the inorganic acid is concentrated sulfuric acid with the mass concentration of 98%. The other is the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: and in the second step, the stirring speed is 300 r/min. The others are the same as in one of the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: in step two according to H2O2The mass ratio of the total solid content TS of the biogas slurry treated in the step one to the total solid content TS of the biogas slurry treated in the step one is 0.4, and H is added2O2. The other is the same as one of the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: in the second step, the microwave power is 300W. The other is the same as one of the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: in step two, H2O2The mass fraction is 30%. The other is the same as one of the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: the method for treating the cow dung fermentation biogas slurry by using the microwave/hydrogen peroxide is completed by using a microwave catalytic oxidation precipitation device system, wherein the microwave catalytic oxidation precipitation device system comprises a water inlet tank 1, a microwave reactor, a precipitation tank 5, a water outlet pipe 6, a bubble remover 8 and a support 10; the water inlet pool 1 is communicated with a water inlet of a microwave reactor through a pipeline, the bracket 10 is arranged below the microwave reactor, and the microwave reactor comprises a magnetic stirrer 11, a metal shell 12, a cylindrical glass inner cavity 4, a microwave emitter 2 and a waveguide tube 3; the lower part of the cylindrical glass inner cavity 4 is arranged in the metal shell 12, the bottom of the cylindrical glass inner cavity 4 is provided with a magnetic stirrer 11, and the upper part of the cylindrical glass inner cavity 4 is arranged on the upper part of the metal shell 12; the area between the cylindrical glass inner cavity 4 and the metal shell 12 is a hollow interlayer, the microwave emitter 2 is arranged in the hollow interlayer, the transmitting end of the microwave emitter 2 is connected with the input end of the waveguide tube 3, and the output end of the waveguide tube 3 is connected with the outer wall of the cylindrical glass inner cavity 4; a drug feeding port 9 is arranged on one side of the upper part of the cylindrical glass inner cavity body 4, and a water outlet 4-1 of the microwave reactor is arranged on the other side; the top of the cylindrical glass inner cavity 4 is provided with a foam collecting opening 7; the foam outlet of the foam collecting port 7 is communicated with the foam inlet of the foam removing device 8 through a pipeline, the water outlet of the foam removing device 8 is communicated with the water inlet of the sedimentation tank 5 through a pipeline, the water outlet 4-1 of the microwave reactor is communicated with the water inlet of the sedimentation tank 5 through a pipeline, and the sedimentation tank 5 is provided with a water outlet pipe 6. The other is the same as one of the first to seventh embodiments.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: the wave emitters 2 are staggered in the hollow interlayer at different heights. The other is the same as one of the first to ninth embodiments.
The detailed implementation mode is ten: the present embodiment differs from one of the first to ninth embodiments in that: the method for treating the cow dung fermentation biogas slurry by using the microwave/hydrogen peroxide through the microwave catalytic oxidation precipitation device system comprises the following steps:
the cow dung fermentation biogas slurry is filled into a water inlet tank 1, is lifted by a pump and is conveyed into a microwave reactor for preheating, the preheating is carried out to 40-50 ℃, inorganic acid is added to adjust the pH value to 3, and then the pH value is adjusted according to H2O2H is added with the mass ratio of the total solid content TS of the biogas slurry to the total solid content TS of the biogas slurry being 0.42O2Keeping the microwave condition, stirring by using a magnetic stirrer 11, controlling the stirring speed to be 300r/min, and keeping for 4-5 min to obtain oxidized cow dung fermentation biogas slurry; and then outputting the oxidized cow dung fermentation biogas slurry from a water outlet 4-1 of the microwave reactor, removing bubbles generated by the reaction through a bubble collecting port 7 through a bubble remover 8, feeding the liquid with bubbles removed by the bubble remover 8 into a sedimentation tank 5 through a pipeline, feeding the liquid treated by the microwave reactor into the sedimentation tank 5 through the water outlet 4-1 of the microwave reactor, settling the liquid in the sedimentation tank 5 for 1-1.5 h, and discharging the liquid through a water outlet pipe 6. The other is the same as one of the first to ninth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
the first embodiment is as follows:
in the embodiment, a microwave/hydrogen peroxide treatment method of cow dung fermentation biogas slurry is completed by adopting a microwave catalytic oxidation precipitation device system, wherein the microwave catalytic oxidation precipitation device system comprises a water inlet tank 1, a microwave reactor, a precipitation tank 5, a water outlet pipe 6, a bubble remover 8 and a support 10; the water inlet pool 1 is communicated with a water inlet of a microwave reactor through a pipeline, the bracket 10 is arranged below the microwave reactor, and the microwave reactor comprises a magnetic stirrer 11, a metal shell 12, a cylindrical glass inner cavity 4, a microwave emitter 2 and a waveguide tube 3; the cylindrical glass inner cavity 4 is inserted into the metal shell 12, the magnetic stirrer 11 is arranged at the bottom of the cylindrical glass inner cavity 4, and the upper part of the cylindrical glass inner cavity 4 is arranged outside the metal shell 12; the space between the cylindrical glass inner cavity 4 and the metal shell 11 is a hollow interlayer, the microwave emitter 2 is arranged in the hollow interlayer, the transmitting end of the microwave emitter 2 is connected with the input end of the waveguide tube 3, and the output end of the waveguide tube 3 is connected with the wall of the cylindrical glass inner cavity 4; a drug feeding port 9 is arranged on one side of the upper part of the cylindrical glass inner cavity body 4, and a water outlet 4-1 of the microwave reactor is arranged on the other side; the top of the cylindrical glass inner cavity 4 is provided with a foam collecting opening 7; the foam collecting port 7 is communicated with a bubble remover 8 through a pipeline, the water outlet of the bubble remover 8 is communicated with the water inlet of the sedimentation tank 5 through a pipeline, the water outlet 4-1 of the microwave reactor is communicated with the water inlet of the sedimentation tank 5 through a pipeline, and the upper part of the sedimentation tank 5 is provided with a water outlet pipe 6;
the method for treating the cow dung fermentation biogas slurry by using the microwave/hydrogen peroxide through the microwave catalytic oxidation precipitation device system comprises the following steps:
200mL of cow dung fermentation biogas slurry with the original COD concentration of 24157mg/L, pH-7.8 is filled into a water inlet pool 1, is lifted by a pump and is conveyed into a microwave reactor for preheating, the power of the microwave reactor is adjusted to 300W, the temperature is preheated to 50 ℃, concentrated sulfuric acid with the mass concentration of 98% is added to adjust the pH value to 3, and then the pH value is adjusted to 3 according to H2O2The mass ratio of the total solid content TS of the biogas slurry to the total solid content TS of the biogas slurry is 0.4, and H is added2O2Keeping the microwave condition, stirring by a magnetic stirrer 11, controlling the stirring speed to be 300r/min, and keeping for 5min to obtain oxidized cow dung fermentation biogas slurry; then the oxidized cow dung fermentation biogas slurry is output from a water outlet 4-1 of the microwave reactor for reactionThe generated bubbles are eliminated through a bubble remover 8 through a foam collecting port 7, the liquid with bubbles eliminated by the bubble remover 8 enters a sedimentation tank 5 through a pipeline, the liquid treated by the microwave reactor enters the sedimentation tank 5 through a microwave reactor water outlet 4-1 through a pipeline, the sedimentation time of the liquid in the sedimentation tank 5 is 1.5h, and the liquid is discharged through a water outlet pipe 6, so that the method for treating the cow dung fermentation biogas slurry through the microwave/hydrogen peroxide is completed.
Tests show that the COD concentration of the cow dung fermentation biogas slurry treated by the embodiment is 7536mg/L, the COD removal rate reaches 68%, and the sedimentation ratio is 38%.
Through calculation, the COD concentration of the cow dung fermentation biogas slurry is 7536mg/L after microwave/hydrogen peroxide treatment, the COD removal rate reaches 68%, the sedimentation ratio is reduced to 38% during solid-liquid separation, and the treated cow dung fermentation biogas slurry is clear and transparent.
The technical scheme of the invention is as follows:
firstly, the operation is simple: the reaction temperature adopted by the invention is low (<100 ℃), and the method can be realized by opening the environment under normal pressure without a high-temperature high-pressure system; the hydrogen peroxide used in the present invention is convenient to transport and does not require on-site preparation (e.g., ozone in an ozone advanced oxidation process requires on-site preparation). Secondly, reducing energy consumption: in the invention, the preheating step is carried out by using the waste heat after microwave radiation, thereby greatly reducing the energy consumption. Thirdly, the oxidation time is shortened, and the cost is reduced: the microwave heating device adopts microwave heating, the heating effect is different from a heat conduction and convection mode, and the energy is converted into the energy for heating substance molecules, so the required time is approximately instant, the aim of quick heating can be achieved, heat loss caused by long-time heating is avoided, the microwave heating device is an energy-saving heating mode, the heating selectivity is good, the pyrolysis is quick, the treatment efficiency is high, and the treatment effect is good. Fourthly, reducing subsequent processing load: the load of subsequent biological treatment is reduced due to the function of pretreatment. The biological treatment adopts anaerobic biological treatment, the sludge yield is low, the required energy consumption is low, and energy-derived gas methane can be generated, and the effective combination of the two processes ensures that the water quality of the total treated effluent reaches the standard and is stable, so that the treatment requirement of recycling is met.
Claims (5)
1. A method for treating cow dung fermentation biogas slurry by microwave/hydrogen peroxide is characterized by comprising the following steps:
firstly, preheating stage: preheating biogas slurry to 40-50 ℃ through a microwave reactor;
II, microwave/hydrogen peroxide treatment: adjusting the pH value of the biogas slurry treated in the step one to 3 by adopting inorganic acid, and then adding H2O2Placing the mixture into a microwave condition, stirring the mixture at the same time for 4-5 min, closing a microwave source, taking out the mixture, and standing the mixture for 1-1.5 h at normal temperature to finish the method for treating the cow dung fermentation biogas slurry by using the microwave/hydrogen peroxide;
in the first step, the power of the microwave reactor is 300W;
in the second step, the inorganic acid is concentrated sulfuric acid with the mass concentration of 98 percent;
in step two according to H2O2The mass ratio of the total solid content TS of the biogas slurry treated in the step one to the total solid content TS of the biogas slurry treated in the step one is 0.4, and H is added2O2；
In the second step, the microwave power is 300W;
the method for treating the cow dung fermentation biogas slurry by using the microwave/hydrogen peroxide is completed by using a microwave catalytic oxidation precipitation device system, wherein the microwave catalytic oxidation precipitation device system comprises a water inlet pool (1), a microwave reactor, a precipitation pool (5), a water outlet pipe (6), a bubble remover (8) and a support (10); the water inlet pool (1) is communicated with a water inlet of a microwave reactor through a pipeline, the bracket (10) is arranged below the microwave reactor, and the microwave reactor comprises a magnetic stirrer (11), a metal shell (12), a cylindrical glass inner cavity body (4), a microwave emitter (2) and a waveguide tube (3); the lower part of the cylindrical glass inner cavity (4) is arranged in the metal shell (12), the bottom of the cylindrical glass inner cavity (4) is provided with a magnetic stirrer (11), and the upper part of the cylindrical glass inner cavity (4) is arranged on the upper part of the metal shell (12); the area between the cylindrical glass inner cavity (4) and the metal shell (12) is a hollow interlayer, the microwave emitter (2) is arranged in the hollow interlayer, the transmitting end of the microwave emitter (2) is connected with the input end of the waveguide tube (3), and the output end of the waveguide tube (3) is connected with the outer wall of the cylindrical glass inner cavity (4); a drug feeding port (9) is arranged on one side of the upper part of the cylindrical glass inner cavity body (4), and a microwave reactor water outlet (4-1) is arranged on the other side; the top of the cylindrical glass inner cavity (4) is provided with a foam collecting opening (7); the foam outlet of the foam collecting port (7) is communicated with the foam inlet of the foam remover (8) through a pipeline, the water outlet of the foam remover (8) is communicated with the water inlet of the sedimentation tank (5) through a pipeline, the water outlet (4-1) of the microwave reactor is communicated with the water inlet of the sedimentation tank (5) through a pipeline, and the sedimentation tank (5) is provided with a water outlet pipe (6).
2. The method for treating the cow dung fermentation biogas slurry through the microwaves/hydrogen peroxide as claimed in claim 1, wherein the stirring speed in the second step is 300 r/min.
3. The method for treating cow dung fermentation biogas slurry through microwaves/hydrogen peroxide according to claim 1, wherein H is adopted in the second step2O2The mass fraction is 30%.
4. The method for treating the cow dung fermentation biogas slurry through the microwaves/hydrogen peroxide as claimed in claim 1, wherein the microwave emitters (2) are arranged in the hollow interlayer in a staggered mode at different heights.
5. The method for treating the cow dung fermentation biogas slurry through the microwaves/the hydrogen peroxide according to claim 1, which is characterized in that the method for treating the cow dung fermentation biogas slurry through the microwaves/the hydrogen peroxide by adopting the microwave catalytic oxidation precipitation device system comprises the following steps:
the cow dung fermentation biogas slurry is filled into a water inlet tank (1), is lifted by a pump and is conveyed into a microwave reactor for preheating, the preheating is carried out to 40-50 ℃, inorganic acid is added to adjust the pH value to 3, and then the pH value is adjusted according to H2O2H is added with the mass ratio of the total solid content TS of the biogas slurry to the total solid content TS of the biogas slurry being 0.42O2Keeping the microwave condition, stirring by a magnetic stirrer (11), controlling the stirring speed to be 300r/min, and keeping for 4-5 min to obtain the oxidized cow dung fermented biogas slurry; then the oxidized cow dung fermentation biogas slurry is output from a water outlet (4-1) of the microwave reactor, bubbles generated by the reaction are eliminated through a bubble remover (8) through a foam collecting port (7), and the bubbles are eliminated by the bubble remover (8) to obtain a liquidThe body enters a sedimentation tank (5) through a pipeline, liquid treated by the microwave reactor enters the sedimentation tank (5) through a microwave reactor water outlet (4-1) through a pipeline, the sedimentation time of the liquid in the sedimentation tank (5) is 1-1.5 h, and the liquid is discharged through a water outlet pipe (6).
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