CN113321560B - Method and device for producing efficient organic liquid fertilizer by utilizing biogas slurry - Google Patents
Method and device for producing efficient organic liquid fertilizer by utilizing biogas slurry Download PDFInfo
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Abstract
The invention provides a method and a device for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry, wherein the method comprises the following steps: s1, performing primary treatment on raw materials, performing primary deodorization and sterilization on biogas slurry by using ferrate and a bacteriostatic agent, and filtering to obtain primary treatment liquid; s2, reprocessing the raw materials, further deodorizing the primary treatment liquid by using micro-nano bubble water, removing suspended fine particle insoluble substances, and filtering to obtain biogas slurry stock solution; s3, producing the liquid fertilizer, namely freely mixing the biogas slurry stock solution with a nitrogen solution, a phosphorus solution, a potassium solution, an organic solution and a medium-trace element mother solution according to different set formulas to obtain the biogas slurry liquid fertilizer with comprehensive nutrients suitable for different crops. The invention also provides a device used in the method for producing the high-efficiency organic liquid fertilizer by utilizing the biogas slurry. The method provided by the invention has the advantages of simple process, lower construction cost and high automation degree; the biogas slurry fertilizer prepared by the method has the advantages of improved commodity, comprehensive nutrients and flexible formula, and can realize the maximum utilization of biogas slurry.
Description
Technical Field
The invention relates to the field of resource utilization of agricultural wastes, in particular to a method and a device for producing an efficient organic liquid fertilizer by utilizing biogas slurry.
Background
The biogas slurry refers to residues of various organic matters such as human and animal excreta and straws after anaerobic fermentation. With the large-scale and intensive development of the breeding industry in China, the main treatment modes of a large amount of livestock and poultry manure produced by the breeding industry at present are generally to treat high-concentration organic wastewater through biogas engineering and the like, namely, anaerobic biodegradation. The existing biogas slurry treatment mode can be divided into low-cost natural ecological purification, high-cost factory treatment and high-added-value development and utilization, but the treatment process can greatly increase the treatment cost; on the other hand, although biogas slurry is a byproduct of anaerobic digestion process, it is also an environmentally friendly fertilizer widely used in agricultural production, and is an important content for resource utilization of agricultural wastes advocated by the state.
With the continuous improvement of the automation degree of agricultural production, the fertilizer consumption has the tendency of high concentration, liquidization and combination. The content of the liquid fertilizer in the United states is nearly 40%, the Israel field with high integration degree of water and fertilizer almost applies the liquid fertilizer, and in addition, the countries such as British, belgium, the Netherlands and the like also use the liquid fertilizer in large quantities. Biogas slurry is a good liquid fertilizer, and the components of the biogas slurry are mainly water. The biogas slurry has double functions in crop growth, one is used as a biological fertilizer containing nitrogen, phosphorus, potassium and various trace elements, and the other is used as a biological pesticide containing amino acid, growth hormone and antibiotics. A large number of researches show that the biogas slurry is a high-quality and full-effect organic fertilizer. On the basis of ensuring the quality improvement and yield increase of crops, the fertilizer can replace or partially replace chemical fertilizers, has wide application range, and can be used as a base fertilizer, an additional fertilizer or a leaf fertilizer.
The commercial fertilizer produced by using biogas slurry abroad is mainly concentrated by a multi-effect steam mode, the equipment investment cost is high, and large-area popularization and application are difficult at the present stage of China. The production of commercial fertilizer by using biogas slurry in China has great difference with that produced by using biogas slurry abroadIn China, the biogas slurry commodity fertilizer meets the national and industrial standards by adding auxiliary materials (mainly inorganic nutrient elements) into the biogas slurry. However, the components of the biogas slurry are complex, and the biogas slurry contains a large amount of microorganisms, salt ions and solid suspended matters, so that the blockage of irrigation equipment is easily caused by direct field application; meanwhile, the poor commerciality of the liquid fertilizer containing biogas slurry is also caused by the reasons of incomplete biogas slurry deodorization and the like, and the production enthusiasm of fertilizer enterprises is low. Chinese invention patent CN105819589A discloses a method for removing biogas slurry odor, which only utilizes ferrate and bacteriostatic agent for deodorization, but ferrate deodorization mainly oxidizes hydrogen sulfide (H) 2 S), methyl mercaptan (CH) 3 SH), methylthio (CH) 3 ) 2 S), ammonia (NH) 3 ) And the odor substances in the biogas slurry not only comprise hydrogen sulfide (H) 2 S), ammonia (NH) 3 ) Indole, volatile phenol and the like are also included, and odor in the biogas slurry cannot be completely removed only by using ferrate for deodorization; meanwhile, the biogas slurry fertilizer prepared by the method is biogas slurry stock solution, needs to be diluted when in use, and needs to be additionally added with a large amount of water if used for irrigation. Therefore, a new biogas slurry treatment method needs to be researched for biogas slurry treatment so as to obtain a biogas slurry treatment solution which is more thorough in deodorization and more water-saving in use.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects and shortcomings of the existing biogas slurry fertilizer and providing a method for producing a high-efficiency organic liquid fertilizer by using biogas slurry, wherein the biogas slurry is subjected to oxidation deodorization and multiple filtration, and then is further deodorized and purified by micro-nano bubble water to obtain a biogas slurry stock solution; and mixing the biogas slurry stock solution to obtain liquid fertilizers with different nutrient ratios.
The first purpose of the invention is to provide a method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry.
The second purpose of the invention is to provide a device for the method for producing the high-efficiency organic liquid fertilizer by utilizing biogas slurry.
The above object of the present invention is achieved by the following technical solutions:
a method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry comprises the following steps:
s1, primary treatment of raw materials: performing primary deodorization and sterilization on the biogas slurry by using ferrate and a bacteriostatic agent, and filtering to obtain primary treatment liquid;
s2, raw material reprocessing: further deodorizing the primary treatment liquid by using micro-nano bubble water, removing suspended fine particle insoluble substances, and filtering to obtain biogas slurry stock solution;
s3, liquid fertilizer production: and (3) freely mixing the biogas slurry stock solution with a nitrogen solution, a phosphorus solution, a potassium solution, an organic solution and a medium-trace element mother solution according to different set formulas to obtain the biogas slurry liquid fertilizer with comprehensive nutrients suitable for different crops.
Bubbles having a diameter of 100 μm or less are called microbubbles, and bubbles having a diameter of 100nm or less are called nanobubbles. The diameter of the micro-nano bubbles is between that of the micro bubbles and that of the nano bubbles, namely, the bubbles with the diameter of tens of microns to hundreds of nanometers when the bubbles occur. Compared with the common bubbles, the micro-nano bubbles have the characteristics of long retention time in water, high mass transfer efficiency, high interface potential, free radical release and the like. The surface of the micro-nano bubbles is provided with negative charges and is higher than common bubbles, the surface charges of the micro-nano bubbles are usually-50 to-30 mV, very dense and fine bubbles can be generated in biogas slurry water, and the phenomenon of fusion increase and breakage can not occur. By utilizing the electronegativity of the micro-nano bubbles, positively charged substances in water can be adsorbed, organic suspended solids or pollutants in water are removed, and the purification effect of solid-liquid separation is realized; research also finds that the micro-nano bubbles have strong oxidizing property and can inactivate bacteria. Substances generating odor in the biogas slurry treatment process mainly comprise ammonia gas, hydrogen sulfide, indole and volatile phenolic substances. Most of odor-producing substances are organic compounds which are provided with active groups and are easy to generate chemical reaction and be oxidized particularly, the invention can achieve the purpose of quick deodorization by utilizing the double oxidation of micro-nano bubbles and ferrate. In addition, the micro-nano bubbles can inactivate bacteria and reduce the propagation of harmful microorganisms in the biogas slurry. According to the method, the odor source in the biogas slurry is quickly removed by double oxidation of ferrate and micro-nano bubble water, so that the odor is fully removed; meanwhile, the micro-nano bubble water is utilized, and the water requirement for producing liquid fertilizer is also saved. The liquid fertilizer prepared by the method has higher nutritive value and commodity property, and can meet the requirements of various irrigation facilities; the method is easy to operate, simple in technology and low in cost, and can realize the maximum utilization of the biogas slurry.
Preferably, the primary treatment of the raw materials in the step S1 is to add ferrate accounting for 0.001-0.02% of the mass of the biogas slurry, perform mixing reaction for 5-12 h, and then add bacteriostatic accounting for 0.001-0.02% of the mass of the biogas slurry to perform primary deodorization and sterilization.
Preferably, the filtering in step S1 is double filtering by the first filter screen and the second filter screen.
Further preferably, the pore size of the filter net in the step S1 is 850 μm and 250 μm respectively.
Preferably, in the step S1, the ferrate is potassium ferrate or sodium ferrate, and the bacteriostatic agent is 2-bromo-2-nitro-1.3-propanediol.
Preferably, the step S2 of raw material reprocessing is to mix micro-nano bubble water and primary treatment liquid, wherein the mixing volume ratio of the micro-nano bubble water to the biogas slurry is 2-5:1.
Preferably, the micro-nano bubble water in step S2 is recycled water from a nano bubble generator, and the gas source of the nano bubble generator is air.
Preferably, the filtering in step S2 is filtering through a disc filter.
Further preferably, the filtering precision in the step S2 is 106 μm.
Preferably, the nitrogen solution in step S3 includes a urea solution and a urea ammonium nitrate solution; the phosphorus solution is monoammonium phosphate solution; the potassium solution is potassium chloride solution.
A device used in a method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry comprises a biogas slurry treatment device and a liquid fertilizer mixing device. The biogas slurry treatment device comprises: the device comprises a nano bubble generator 1, a bubble water tank 2, a filtering tank 3, a filter screen 4, a slag discharge port 5, a first valve 6, a second valve 7, a first centrifugal pump 8, a biogas slurry treatment tank 10, a second centrifugal pump 11 and a filtering component 12; the liquid fertilizer mixing device comprises a biogas slurry raw material tank 13, a first pneumatic valve 14, a third centrifugal pump 15, a nitrogen solution tank 16, a second pneumatic valve 17, a fourth centrifugal pump 18, a phosphorus solution tank 19, a third pneumatic valve 20, a fifth centrifugal pump 21, a potassium solution tank 22, a fourth pneumatic valve 23, a sixth centrifugal pump 24, a medium trace element tank 25, a fifth pneumatic valve 26, a seventh centrifugal pump 27, a mixing tank 29, a flowmeter 30, an eighth centrifugal pump 31, an electromagnetic valve 32 and a terminal controller 33; one end of the bubble pool 2 is connected with the nano bubble generator 1, and the other end is connected with a first valve 6; a filter screen 4 and a slag discharge port 5 are arranged in the filter tank 3, the slag discharge port 5 is arranged at the bottom of the filter tank 3, and one end of the filter tank 3 close to the filtrate is connected with a second valve 7; the first valve 6 and the second valve 7 are connected to a first centrifugal pump 8 together and are connected with a biogas slurry treatment tank 10 through the first centrifugal pump 8; the biogas slurry treatment tank 10 is connected with one end 12 of the filtering component through a second centrifugal pump 11, and the other end of the filtering component 12 is connected with a feed inlet of a biogas slurry raw material tank 13; a discharge port of the biogas slurry raw material tank 13 is connected with a feed port of the mixing tank 29 through a main pipeline, and a first pneumatic valve 14 and a third centrifugal pump 15 are arranged near the discharge port of the biogas slurry raw material tank 13; the nitrogen solution tank 16, the phosphorus solution tank 19, the potassium solution tank 22 and the medium trace element tank 25 are connected with the main pipeline through branch pipelines, and a second pneumatic valve 17 and a fourth centrifugal pump 18, a third pneumatic valve 20 and a fifth centrifugal pump 21, a fourth pneumatic valve 23 and a sixth centrifugal pump 24, a fifth pneumatic valve 26 and a seventh centrifugal pump 27 are respectively arranged on each branch pipeline; the mixing tank 29 is connected with the electromagnetic valve 32 through the eighth centrifugal pump 31, a flow meter 30 is further arranged between the mixing tank 29 and the eighth centrifugal pump 31, and the terminal controller 33 comprises a manual controller 331 and a remote control terminal 332 for controlling each valve to control the liquid outlet amount of each tank.
Preferably, the filter tank 3 is designed in a height-drop type, and the filter screen 4 includes a first filter screen 41 and a second filter screen 42.
Further preferably, the apertures of the first filter 41 and the second filter 42 are 850 μm and 250 μm, respectively.
Preferably, a stirrer 9 is further arranged in the biogas slurry treatment tank 10.
Preferably, a stirring unit 28 is also arranged in the mixing tank 29.
Preferably, the biogas slurry treatment tank 10 can also perform aerobic fermentation or mixed culture with aerobic microorganisms as required.
Preferably, the filter assembly 12 is a disc filter with a filtration precision of 106 μm.
Preferably, the system remote control terminal 332 is automatically controlled by PLC programming.
Preferably, the blending tank 29 is provided with weighing means to control the addition of the different raw materials.
Preferably, the terminal controller 33 can automatically calculate the required amounts of different raw material fertilizers and liquids according to field data collected by an agronomic engineer.
As a specific use method of the above apparatus:
directly injecting the collected anaerobic fermentation biogas slurry into a filter tank 3, adding ferrate into the filter tank 3 for oxidation deodorization, adding a bacteriostatic agent to prevent bacteria from breeding, primarily filtering the biogas slurry through a 850 mu m first filter screen 41 and a 250 mu m second filter screen 42, and injecting the primarily filtered biogas slurry into a biogas slurry treatment tank 10 by controlling a second valve 7 and a centrifugal pump 8. The water source in the bubble pool is continuously treated by the nano bubble generator 1, the concentration of dissolved oxygen in water reaches the saturation concentration, and the content of dissolved oxygen in water is close to 4ppm. Micro-nano bubble water is injected into the biogas slurry treatment tank through controlling the first valve 6 and the centrifugal pump 8, is fully stirred with biogas slurry and then stands, so that an odor substance source of the biogas slurry can be further removed, and meanwhile, suspended fine insoluble particles in the biogas slurry can be removed. The treated biogas slurry is injected into a filtering component 12 with the diameter of 106 mu m by a second centrifugal pump 11, and the biogas slurry flows into a biogas slurry raw material tank 13 after being filtered. The opening and closing of pneumatic valves of the biogas slurry raw material tank 13, the nitrogen solution tank 16, the phosphorus solution tank 19, the potassium solution tank 22 and the medium and trace element tank 15 and the operation of centrifugal pumps of the tanks are controlled by a terminal system 33, the raw materials are injected into a mixing tank 29 for mixing, a stirring unit 28 is arranged in the mixing tank 29, the uniform mixing among different raw materials can be ensured, meanwhile, a weighing device is arranged on the mixing tank for controlling the addition amount of the different raw materials, and the required formula liquid fertilizer can be obtained after continuous stirring for more than half an hour. And finally, outputting the finished biogas slurry fertilizer through a centrifugal pump 31 for commercialized packaging or directly conveying to the field, controlling the extraction amount of the finished biogas slurry fertilizer through a flowmeter 30, and controlling the discharging through an electromagnetic valve 32.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention provides a method for producing a high-efficiency organic liquid fertilizer by utilizing biogas slurry, ferrate and micro-nano bubble water are utilized to fully deodorize, the content reduction rate of hydrogen sulfide reaches 100 percent under the condition that the content of substances generating odor before and after biogas slurry treatment is obvious, the content reduction rates of indole and volatile phenol also reach 84.67 percent and 77.65 percent respectively, the deodorization is full, and the marketability of the biogas slurry is improved; different biogas slurry fertilizers are prepared according to different growth requirements of crops, and the biogas slurry fertilizer has the advantages of comprehensive nutrients, flexible formula, high automation degree, flexible use and wide application range.
(2) The method provided by the invention has the advantages of simple production process and relatively low construction cost, and the biogas slurry fertilizer prepared by the method can meet the requirements of various irrigation facilities and can realize the maximum utilization of biogas slurry. The invention does not produce waste liquid in the production process of completely utilizing biogas slurry, and greatly saves water sources consumed by producing liquid fertilizer by utilizing micro-nano bubble water. Provides an effective way for realizing the cyclic utilization of agricultural waste resources, fundamentally solves the difficult problem of the utilization of the biogas slurry, and realizes the change of waste into valuable and high-efficiency utilization.
(3) The invention provides a method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry, the device is simple in equipment, is suitable for industrial and large-scale production of the high-efficiency organic liquid fertilizer from the biogas slurry in a more concentrated area of the breeding industry, and can improve the comprehensive utilization benefit of the biogas slurry.
Drawings
Fig. 1 is a schematic structural diagram of a device used in a method for producing a high-efficiency organic liquid fertilizer from biogas slurry in embodiment 1 of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the following detailed description, which are not intended to limit the invention in any way. The reagents, methods and apparatus employed in the present invention are conventional in the art, except as otherwise indicated.
Unless otherwise indicated, reagents and materials used in the following examples are commercially available.
Example 1 apparatus for use in a method for producing a highly efficient organic liquid fertilizer from biogas slurry
A device used in a method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry comprises a biogas slurry treatment device and a liquid fertilizer mixing device. The biogas slurry treatment device comprises: the device comprises a nano bubble generator 1, a bubble water tank 2, a filtering tank 3, a filter screen 4, a slag discharge port 5, a first valve 6, a second valve 7, a first centrifugal pump 8, a biogas slurry treatment tank 10, a second centrifugal pump 11 and a filtering component 12; the liquid fertilizer mixing device comprises a biogas slurry raw material tank 13, a first pneumatic valve 14, a third centrifugal pump 15, a nitrogen solution tank 16, a second pneumatic valve 17, a fourth centrifugal pump 18, a phosphorus solution tank 19, a third pneumatic valve 20, a fifth centrifugal pump 21, a potassium solution tank 22, a fourth pneumatic valve 23, a sixth centrifugal pump 24, a medium trace element tank 25, a fifth pneumatic valve 26, a seventh centrifugal pump 27, a mixing tank 29, a flowmeter 30, an eighth centrifugal pump 31, an electromagnetic valve 32 and a terminal controller 33; one end of the bubble pool 2 is connected with the nano bubble generator 1, and the other end is connected with a first valve 6; a filter screen 4 and a slag discharge port 5 are arranged in the filter tank 3, the slag discharge port 5 is arranged at the bottom of the filter tank 3, and one end of the filter tank 3 close to the filtrate is connected with a second valve 7; the first valve 6 and the second valve 7 are connected to a first centrifugal pump 8 together and are connected with a biogas slurry treatment tank 10 through the first centrifugal pump 8; the biogas slurry treatment tank 10 is connected with one end 12 of the filtering component through a second centrifugal pump 11, and the other end of the filtering component 12 is connected with a feed inlet of a biogas slurry raw material tank 13; a discharge port of the biogas slurry raw material tank 13 is connected with a feed port of the mixing tank 29 through a main pipeline, and a first pneumatic valve 14 and a third centrifugal pump 15 are arranged near the discharge port of the biogas slurry raw material tank 13; the nitrogen solution tank 16, the phosphorus solution tank 19, the potassium solution tank 22 and the medium trace element tank 25 are connected with the main pipeline through branch pipelines, and a second pneumatic valve 17 and a fourth centrifugal pump 18, a third pneumatic valve 20 and a fifth centrifugal pump 21, a fourth pneumatic valve 23 and a sixth centrifugal pump 24, a fifth pneumatic valve 26 and a seventh centrifugal pump 27 are respectively arranged on each branch pipeline; the mixing tank 29 is connected with the electromagnetic valve 32 through the eighth centrifugal pump 31, a flow meter 30 is further arranged between the mixing tank 29 and the eighth centrifugal pump 31, and the terminal controller 33 comprises a manual controller 331 and a remote control terminal 332 for controlling each valve to control the liquid outlet amount of each tank.
The use method and principle of the device are as follows:
directly injecting the collected anaerobic fermentation biogas slurry into a filter tank 3, adding ferrate into the filter tank 3 for oxidation deodorization, adding a bacteriostatic agent to prevent bacteria from breeding, primarily filtering the biogas slurry through a 850 mu m first filter screen 41 and a 250 mu m second filter screen 42, and injecting the primarily filtered biogas slurry into a biogas slurry treatment tank 10 by controlling a second valve 7 and a centrifugal pump 8. The water source in the bubble pool is continuously treated by the nano bubble generator 1, the concentration of dissolved oxygen in water reaches the saturation concentration, and the content of dissolved oxygen in water is close to 4ppm. Micro-nano bubble water is injected into the biogas slurry treatment tank through controlling the first valve 6 and the centrifugal pump 8, is fully stirred with biogas slurry and then stands, so that an odor substance source of the biogas slurry can be further removed, and meanwhile, suspended fine insoluble particles in the biogas slurry can be removed. The treated biogas slurry is injected into a filtering component 12 with the diameter of 106 mu m through a second centrifugal pump 11, and the biogas slurry flows into a biogas slurry raw material tank 13 after being filtered. The opening and closing of pneumatic valves of the biogas slurry raw material tank 13, the nitrogen solution tank 16, the phosphorus solution tank 19, the potassium solution tank 22 and the medium and trace element tank 15 and the operation of centrifugal pumps of the tanks are controlled by a terminal controller 33, the raw materials are injected into a mixing tank 29 to be mixed, a stirring unit 28 is arranged in the mixing tank 29, the uniform mixing among different raw materials can be ensured, meanwhile, a weighing device is arranged on the mixing tank to control the adding amount of the different raw materials, and the required formula liquid fertilizer can be obtained after continuous stirring for more than half an hour. And finally, outputting the finished biogas slurry fertilizer through a centrifugal pump 31 for commercialized packaging or directly conveying to the field, controlling the extraction amount of the finished biogas slurry fertilizer through a flowmeter 30, and controlling the discharging through an electromagnetic valve 32.
Example 2 method for producing efficient organic liquid fertilizer by using biogas slurry
A method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry comprises the following steps:
(1) Primary treatment of raw materials: adding potassium ferrate accounting for 0.005% of the mass of the biogas slurry into a filter tank, mixing, reacting for 10 hours, oxidizing and deodorizing, and adding a 2-bromo-2-nitro-1.3-propylene glycol bacteriostatic agent accounting for 0.01% of the mass of the biogas slurry after deodorizing to prevent the breeding of harmful microorganisms again; meanwhile, a primary treatment liquid which is obtained by double filtering of the anaerobic fermentation biogas slurry is obtained by using a double filter screen with the size of 850 mu m and a double filter screen with the size of 250 mu m.
(2) And (3) raw material reprocessing: preparing a water source containing a large amount of micro-nano bubbles by using a nano bubble generator, injecting primary treatment liquid containing the water source and biogas slurry rich in the micro-nano bubbles into a mixing pool, wherein the volume ratio of the micro-nano bubbles to the primary treatment liquid of the biogas slurry is 5:1, stirring by using a stirrer and standing for 24 hours, sufficiently removing odor substances and suspended fine particle insoluble substances by using the micro-nano bubbles, injecting the retreated biogas slurry into a disc filter group with the filtering precision of 106 mu m through a pump (3), and filtering to obtain a biogas slurry stock solution.
(3) Production of liquid fertilizer: the biogas slurry stock solution is used as a raw material for producing liquid fertilizer, and is freely mixed with nitrogen solution, phosphorus solution, potassium solution, organic solution and medium-trace element mother solution according to different set formulas to obtain the biogas slurry-containing liquid fertilizer which is suitable for different crops and has comprehensive nutrients and can be applied to various irrigation facilities. Wherein the nitrogen solution is urea solution, the phosphorus solution is monoammonium phosphate solution, the potassium solution is potassium chloride solution, and the medium and trace element solution is a mixed solution of medium and trace elements.
Example 3 method for producing efficient organic liquid fertilizer by using biogas slurry
A method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry comprises the following steps:
(1) Primary treatment of raw materials: adding potassium ferrate accounting for 0.01 percent of the mass of the biogas slurry into a filter tank, mixing, reacting for 10 hours, oxidizing and deodorizing, and adding a 2-bromo-2-nitro-1.3-propanediol bacteriostatic agent accounting for 0.01 percent of the mass of the biogas slurry after deodorizing to prevent the breeding of harmful microorganisms again; meanwhile, a primary treatment liquid which is obtained by double filtering of the anaerobic fermentation biogas slurry is obtained by using a double filter screen with the size of 850 mu m and a double filter screen with the size of 250 mu m.
(2) And (3) raw material reprocessing: preparing a water source containing a large amount of micro-nano bubbles by using a nano bubble generator, injecting primary treatment liquid containing the water source and biogas slurry rich in the micro-nano bubbles into a mixing pool, wherein the volume ratio of the micro-nano bubbles to the primary treatment liquid of the biogas slurry is 5:1, stirring by using a stirrer and standing for 24 hours, sufficiently removing odor substances and suspended fine particle insoluble substances by using the micro-nano bubbles, injecting the retreated biogas slurry into a disc filter group with the filtering precision of 106 mu m through a pump (3), and filtering to obtain a biogas slurry stock solution.
(3) Production of liquid fertilizer: the biogas slurry stock solution is used as a raw material for producing liquid fertilizer, and is freely mixed with nitrogen solution, phosphorus solution, potassium solution, organic solution and medium-trace element mother solution according to different set formulas to obtain the biogas slurry-containing liquid fertilizer which is suitable for different crops and has comprehensive nutrients and can be applied to various irrigation facilities. Wherein the nitrogen solution is urea solution, the phosphorus solution is monoammonium phosphate solution, the potassium solution is potassium chloride solution, and the medium and trace element solution is a mixed solution of medium and trace elements.
Example 4 method for producing efficient organic liquid fertilizer by using biogas slurry
A method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry comprises the following steps:
(1) Primary treatment of raw materials: adding potassium ferrate accounting for 0.005 percent of the mass of the biogas slurry into a filter tank, mixing, reacting for 10 hours, oxidizing and deodorizing, and adding a 2-bromo-2-nitro-1.3-propanediol bacteriostatic agent accounting for 0.01 percent of the mass of the biogas slurry after deodorizing to prevent the breeding of harmful microorganisms again; meanwhile, a primary treatment liquid which is obtained by double filtering of the anaerobic fermentation biogas slurry is obtained by using a double filter screen with the size of 850 mu m and a double filter screen with the size of 250 mu m.
(2) And (3) raw material reprocessing: preparing a water source containing a large amount of micro-nano bubbles by using a nano bubble generator, injecting primary treatment liquid containing the water source and biogas slurry rich in the micro-nano bubbles into a mixing pool, wherein the volume ratio of the micro-nano bubbles to the primary treatment liquid of the biogas slurry is 2:1, stirring by using a stirrer and standing for 24 hours, sufficiently removing odor substances and suspended fine particle insoluble substances by using the micro-nano bubbles, injecting the retreated biogas slurry into a disc filter group with the filtering precision of 106 mu m through a pump (3), and filtering to obtain a biogas slurry stock solution.
(3) Production of liquid fertilizer: the biogas slurry stock solution is used as a raw material for producing liquid fertilizer, and is freely mixed with nitrogen solution, phosphorus solution, potassium solution, organic solution and medium-trace element mother solution according to different set formulas to obtain the biogas slurry-containing liquid fertilizer which is suitable for different crops and has comprehensive nutrients and can be applied to various irrigation facilities. Wherein the nitrogen solution is urea solution, the phosphorus solution is monoammonium phosphate solution, the potassium solution is potassium chloride solution, and the medium and trace element solution is a mixed solution of medium and trace elements.
Example 5 method for producing efficient organic liquid fertilizer by using biogas slurry
A method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry comprises the following steps:
(1) Primary treatment of raw materials: adding potassium ferrate accounting for 0.01 percent of the mass of the biogas slurry into a filter tank, mixing, reacting for 10 hours, oxidizing and deodorizing, and adding a 2-bromo-2-nitro-1.3-propanediol bacteriostatic agent accounting for 0.01 percent of the mass of the biogas slurry after deodorizing to prevent the breeding of harmful microorganisms again; meanwhile, a primary treatment liquid which is obtained by double filtering of the anaerobic fermentation biogas slurry is obtained by using a double filter screen with the size of 850 mu m and a double filter screen with the size of 250 mu m.
(2) And (3) reprocessing the raw materials: preparing a water source containing a large amount of micro-nano bubbles by using a nano bubble generator, injecting primary treatment liquid containing the water source and biogas slurry rich in the micro-nano bubbles into a mixing pool, wherein the volume ratio of the micro-nano bubbles to the primary treatment liquid of the biogas slurry is 2:1, stirring by using a stirrer and standing for 24 hours, sufficiently removing odor substances and suspended fine particle insoluble substances by using the micro-nano bubbles, injecting the retreated biogas slurry into a disc filter group with the filtering precision of 106 mu m through a pump (3), and filtering to obtain a biogas slurry stock solution.
(3) Production of liquid fertilizer: the biogas slurry stock solution is used as a raw material for producing liquid fertilizer, and is freely mixed with nitrogen solution, phosphorus solution, potassium solution, organic solution and medium-trace element mother solution according to different set formulas to obtain the biogas slurry-containing liquid fertilizer which is suitable for different crops and has comprehensive nutrients and can be applied to various irrigation facilities. Wherein the nitrogen solution is urea solution, the phosphorus solution is monoammonium phosphate solution, the potassium solution is potassium chloride solution, and the medium and trace element solution is a mixed solution of medium and trace elements.
Comparative example 1
A method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry comprises the following steps:
(1) Raw material treatment: adding potassium ferrate accounting for 0.02% of the mass of the biogas slurry into a filter tank, mixing, reacting for 10 hours, oxidizing and deodorizing, and adding a 2-bromo-2-nitro-1.3-propanediol bacteriostatic agent accounting for 0.01% of the mass of the biogas slurry after deodorizing to prevent the breeding of harmful microorganisms again; meanwhile, primary treatment liquid obtained by double filtering of biogas slurry after anaerobic fermentation is obtained by using a double filter screen of 850 mu m and a double filter screen of 250 mu m; the primary treatment liquid is injected into a disc filter group with the filtering precision of 106 mu m through a pump (3) and filtered to obtain biogas slurry stock solution.
(2) Production of liquid fertilizer: the biogas slurry stock solution is used as a raw material for producing liquid fertilizer, and is freely mixed with nitrogen solution, phosphorus solution, potassium solution, organic solution and medium-trace element mother solution according to different set formulas to obtain the biogas slurry-containing liquid fertilizer which is suitable for different crops and has comprehensive nutrients and can be applied to various irrigation facilities. Wherein the nitrogen solution is urea solution, the phosphorus solution is monoammonium phosphate solution, the potassium solution is potassium chloride solution, and the medium and trace element solution is a mixed solution of medium and trace elements.
Comparative example 2
A method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry comprises the following steps:
(1) Primary treatment of raw materials: and (3) performing double filtration on the anaerobic fermentation biogas slurry by using a 850-micron and 250-micron double filter screen to obtain a primary treatment solution.
(2) And (3) raw material reprocessing: preparing a water source containing a large amount of micro-nano bubbles by using a nano bubble generator, injecting primary treatment liquid containing the water source and biogas slurry rich in the micro-nano bubbles into a mixing pool, wherein the volume ratio of the micro-nano bubbles to the primary treatment liquid of the biogas slurry is 6:1, stirring by using a stirrer and standing for 24 hours, sufficiently removing odor substances and suspended fine particle insoluble substances by using the micro-nano bubbles, injecting the retreated biogas slurry into a disc filter group with the filtering precision of 106 mu m through a pump (3), and filtering to obtain a biogas slurry stock solution.
(3) Production of liquid fertilizer: the biogas slurry stock solution is used as a raw material for producing liquid fertilizer, and is freely mixed with nitrogen solution, phosphorus solution, potassium solution, organic solution and medium-trace element mother solution according to different set formulas to obtain the biogas slurry-containing liquid fertilizer which is suitable for different crops and has comprehensive nutrients and can be applied to various irrigation facilities. Wherein the nitrogen solution is urea solution, the phosphorus solution is monoammonium phosphate solution, the potassium solution is potassium chloride solution, and the medium and trace element solution is a mixed solution of medium and trace elements.
Example 6 influence of biogas slurry treatment method on biogas slurry
1. Influence of biogas slurry treatment method on odor substances generated by biogas slurry
Analyzing related components of odor generated before and after biogas slurry treatment in examples 2-5, and determining the concentration of ammonia gas by adopting a Naer colorimetric method; measuring the concentration of hydrogen sulfide by an iodometry method; determining the concentration of indole by HPLC; and respectively measuring the concentration of the volatile phenol by adopting a 4-aminoantipyrine spectrophotometry.
The change in the content of odor-causing substances before and after biogas slurry treatment is shown in table 1.
Table 1: change of content of odor substances before and after biogas slurry treatment
As can be seen from Table 1, the contents of ammonia gas, hydrogen sulfide, indole and volatile phenol which are the odor-producing material sources before and after biogas slurry treatment are all significantly reduced, no hydrogen sulfide is detected in the biogas slurry treated under the combined deodorization effect, and the reduction rate of the contents reaches 100%; the content reduction of the indole and the volatile phenol is also very obvious. Meanwhile, the comparison example shows that the deodorization effect of the water source which singly uses the potassium ferrate with higher dosage or the micro-nano bubbles is lower than the effect of the water source combined treatment of the potassium ferrate and the micro-nano bubbles with small dosage.
2. Influence of biogas slurry treatment method on nutrient content of biogas slurry
Analyzing the nutrient content of the biogas slurry before and after the biogas slurry treatment in the embodiments 2-5, and determining the total nitrogen concentration by adopting a titration method after distillation; measuring the total phosphorus concentration by ascorbic acid color development spectrophotometry; the total organic carbon concentration was determined by potassium dichromate titration.
The change of nutrient content before and after biogas slurry treatment is shown in table 2.
Table 2: change of nutrient content before and after biogas slurry treatment
As can be seen from Table 2, the nutrient content of the biogas slurry before and after treatment tends to decrease, and the nutrient content of the biogas slurry in examples 2 and 3 decreases greatly due to the large dilution ratio. The comparative example also showed a tendency to decrease the nutrient content after treatment, but the decrease was limited.
3. Influence of biogas slurry treatment method on microbial quantity of biogas slurry
The microbial numbers of the biogas slurry before and after the biogas slurry treatment in examples 2 to 5 were analyzed, and the measurement was performed by a dilution plate method.
The change of the number of microorganisms before and after biogas slurry treatment is shown in Table 3
Table 3: change of microbial quantity before and after biogas slurry treatment
As can be seen from Table 3, the number of microorganisms decreased significantly after biogas slurry treatment, and fecal coliform bacteria were not detected particularly in the combined deodorization treatment. However, the effect of the mixing ratio of the potassium ferrate and the nano bubble water is not large. By comparison, the number of residual microorganisms in the biogas slurry in the single treatment mode is still large, so that certain risks can be caused to later application, and the application safety coefficient of the biogas slurry fertilizer in the combined treatment mode is higher.
Example 7 field application test of biogas slurry liquid fertilizer
(1) Test background
Test site: guangxi Zhuang autonomous region city defense harbor city defense area Hua Danzhen Xiguochun village
Test time: 3/2020-8/2020
And (3) test crops: watermelon
Test soil: sand soil
Irrigation facilities: drip irrigation
Test protocol: the experiment is provided with two treatments of preparing liquid compound fertilizer and solid compound fertilizer from the biogas slurry prepared in the embodiment 2 of the invention and applying conventional fertilizer (only compound fertilizer). The conventional fertilization adopts macroelement water soluble fertilizer 'Jia Shi Li' of Chengdu city New Du chemical industry GmbH commonly adopted by local growers (N: P: K is 16.
The formula of the liquid compound fertilizer prepared from biogas slurry comprises the following components: 20 parts of biogas slurry treatment stock solution, 7 parts of nitrogen solution, 4 parts of phosphorus solution, 8 parts of potassium solution and 0.1 part of medium-trace element solution, fully and uniformly mixing, adding a proper amount of water, injecting fertilizer solution into a field irrigation pipeline by using a fertilizer injection pump, and simultaneously ensuring that the EC value of field fertilizer water is below 4. The conventional fertilization is that a large amount of water-soluble granular fertilizer is poured into a fertilizer dissolving pool to be dissolved and then is applied to the field through drip irrigation.
(2) The test results are shown in tables 4 and 5.
Table 4: influence of biogas liquid fertilizer and conventional fertilizer on watermelon root growth
Table 5: influence of biogas liquid fertilizer and conventional fertilizer on yield of watermelon
From tables 4 and 5, the biogas slurry fertilizer can obviously promote the growth of watermelon roots, the total root length, the total root surface area and the number of root tips are obviously increased compared with the conventional fertilizer, and compared with the conventional fertilizer, the total root length, the total root surface area and the number of root tips of the watermelon applied with the biogas slurry fertilizer are respectively increased by 46.07%, 47.09% and 51.83%; the biogas liquid fertilizer has obvious effect of increasing the yield of the watermelon, and the yield is increased by 33.56 percent.
When the biogas liquid fertilizer prepared by the method is used for irrigation, the filter and the dripper are not blocked, and irrigation facilities run normally.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (3)
1. A method for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry is characterized by comprising the following steps: s1, primary treatment of raw materials: performing primary deodorization and sterilization on the biogas slurry by using ferrate and a bacteriostatic agent, and filtering to obtain primary treatment liquid;
s2, raw material reprocessing: further deodorizing the primary treatment liquid by using micro-nano bubble water, removing suspended fine particle insoluble substances, and filtering to obtain biogas slurry stock solution;
s3, liquid fertilizer production: freely mixing the biogas slurry stock solution with a nitrogen solution, a phosphorus solution, a potassium solution, an organic solution and a medium-trace element mother solution according to different set formulas to obtain a biogas slurry liquid fertilizer with comprehensive nutrients suitable for different crops;
the raw material primary treatment in the step S1 is to add ferrate accounting for 0.01 percent of the mass of the biogas slurry, perform mixed reaction for 10h, and then add bacteriostatic accounting for 0.01 percent of the mass of the biogas slurry for primary deodorization and sterilization;
in the step S1, ferrate is potassium ferrate, and the bacteriostatic agent is 2-bromo-2-nitro-1.3-propanediol;
the step S2 of raw material reprocessing is to mix micro-nano bubble water and primary treatment liquid, wherein the volume ratio of the micro-nano bubble water to the mixed biogas slurry is 5:1; stirring the mixed solution and standing for 24 h;
in the step S1, the filtering is double filtering by using two filter screens;
the device adopted by the method consists of a biogas slurry treatment device and a liquid fertilizer mixing device; the biogas slurry treatment device comprises: the device comprises a nano bubble generator (1), a bubble water tank (2), a filtering tank (3), a filter screen (4), a slag discharge port (5), a first valve (6), a second valve (7), a first centrifugal pump (8), a biogas slurry treatment tank (10), a second centrifugal pump (11) and a filtering assembly (12); the liquid fertilizer mixing device comprises a biogas slurry raw material tank (13), a first pneumatic valve (14), a third centrifugal pump (15), a nitrogen solution tank (16), a second pneumatic valve (17), a fourth centrifugal pump (18), a phosphorus solution tank (19), a third pneumatic valve (20), a fifth centrifugal pump (21), a potassium solution tank (22), a fourth pneumatic valve (23), a sixth centrifugal pump (24), a medium trace element tank (25), a fifth pneumatic valve (26), a seventh centrifugal pump (27), a mixing tank (29), a flowmeter (30), an eighth centrifugal pump (31), an electromagnetic valve (32) and a terminal controller (33); one end of the bubble pool (2) is connected with the nano bubble generator (1), and the other end of the bubble pool is connected with the first valve (6); a filter screen (4) and a slag discharge port (5) are arranged in the filter tank (3), the slag discharge port (5) is arranged at the bottom of the filter tank (3), and one end of the filter tank (3) close to the filtrate is connected with a second valve (7); the first valve (6) and the second valve (7) are connected to a first centrifugal pump (8) together and are connected with a biogas slurry treatment pool (10) through the first centrifugal pump (8); the biogas slurry treatment tank (10) is connected with one end of a filtering component (12) through a second centrifugal pump (11), and the other end of the filtering component (12) is connected with a feed inlet of a biogas slurry raw material tank (13); a discharge port of the biogas slurry raw material tank (13) is connected with a feed port of the mixing tank (29) through a main pipeline, and a first pneumatic valve (14) and a third centrifugal pump (15) are arranged near the discharge port of the biogas slurry raw material tank (13); the nitrogen solution tank (16), the phosphorus solution tank (19), the potassium solution tank (22) and the medium and trace element tank (25) are connected with the main pipeline through branch pipelines, and a second pneumatic valve (17) and a fourth centrifugal pump (18), a third pneumatic valve (20) and a fifth centrifugal pump (21), a fourth pneumatic valve (23) and a sixth centrifugal pump (24), a fifth pneumatic valve (26) and a seventh centrifugal pump (27) are respectively arranged on each branch pipeline; the mixing tank (29) is connected with the electromagnetic valve (32) through an eighth centrifugal pump (31), and a flow meter (30) is arranged between the mixing tank (29) and the eighth centrifugal pump (31); the terminal controller (33) comprises a manual controller (331) and a remote control end (332) and is used for controlling each valve to control the liquid outlet amount of each tank body;
the filter screen (4) comprises a first filter screen (41) and a second filter screen (42);
the aperture of the first filter screen (41) and the aperture of the second filter screen (42) are respectively 850 mu m and 250 mu m.
2. The method as claimed in claim 1, wherein a stirrer (9) is further arranged in the biogas slurry treatment tank (10).
3. Method according to claim 1, characterized in that a stirring aggregate (28) is also arranged in the mixing tank (29).
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| CN202110609342.3A CN113321560B (en) | 2021-06-01 | 2021-06-01 | Method and device for producing efficient organic liquid fertilizer by utilizing biogas slurry |
| PCT/CN2022/107603 WO2022253359A1 (en) | 2021-06-01 | 2022-07-25 | Method for producing high-efficiency organic liquid fertilizer by using biogas slurry and apparatus therefor |
| GB2300707.3A GB2611696A (en) | 2021-06-01 | 2022-07-25 | Method for producing high-efficiency organic liquid fertilizer by using biogas slurry and apparatus therefor |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113321560A (en) | 2021-08-31 |
| GB2611696A (en) | 2023-04-12 |
| GB202300707D0 (en) | 2023-03-01 |
| WO2022253359A1 (en) | 2022-12-08 |
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