CN111690691A - Method for realizing resource utilization of biogas residues and biogas slurry wastewater by utilizing two-stage process - Google Patents
Method for realizing resource utilization of biogas residues and biogas slurry wastewater by utilizing two-stage process Download PDFInfo
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Abstract
The invention belongs to the technical fields of environmental protection, wastewater utilization and renewable energy, and particularly relates to a method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process. According to the invention, solid-liquid separation is carried out after the biomass is subjected to anaerobic fermentation to obtain biogas slurry wastewater and biogas residues; then, lignocellulose organic waste is used as a substrate and is uniformly mixed with biogas slurry wastewater to realize ammoniation pretreatment, biogas residues are added, mixed dry anaerobic fermentation is carried out, and methane is collected. Based on the cellulose organic waste ammoniation pretreatment technology and the dry anaerobic fermentation technology, the whole process is carried out in one reactor, the operation condition is mild, stirring is not needed in the reaction process, no biogas slurry wastewater is generated, no additional inoculation is needed, and the method has the advantages of low cost, low energy consumption, less waste, simplicity in operation, stability in operation and the like, realizes the energy utilization of organic matters in biogas residues and the resource utilization of ammonia nitrogen in biogas slurry, changes the idea of using the traditional biogas residues as fertilizers, and solves the problem of difficulty in ammonia nitrogen treatment of the biogas slurry wastewater.
Description
Technical Field
The invention belongs to the technical fields of environmental protection, wastewater utilization and renewable energy, and particularly relates to a method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process.
Background
The source of the biogas slurry wastewater and the biogas residues is very wide, wherein the breeding industry and the biogas engineering are important ways for the source of the biogas slurry wastewater and the biogas residues. The agricultural development of China still mainly takes the traditional agriculture of planting industry, breeding industry and the like, so that a large amount of lignocellulose organic wastes, livestock and poultry manure and the like are generated. The energy utilization of crop straws and livestock and poultry manure is an important way for the resource utilization of the wastes, and a large amount of high-ammonia nitrogen concentration biogas slurry wastewater and biogas residues which need to be subsequently treated can be generated in the energy utilization process.
Biogas slurry wastewater usually has higher ammonia nitrogen concentration, and can cause huge pressure on water and soil if directly discharged. Particularly, in the aquaculture industry, many researchers find that the concentration of ammonia nitrogen in a soil sample is even multiple times of a standard value through analyzing the soil sample around the farm. Under the action of rain water scouring, water and soil loss and the like, the pollution to surrounding watercourses, lakes, underground water and other water environments is indirectly caused. Due to the rich nutrient elements, the eutrophication of the water body is easy to cause, and the growth of water body organisms is seriously influenced. Meanwhile, under the condition of sufficient oxygen, ammonia nitrogen can be oxidized into nitrite nitrogen under the action of microorganisms, and forms a nitrosamine substance under the condition of combination with protein, so that once entering a human body under the action of aquatic organisms, the carcinogenic and teratogenic risks of the human body are greatly increased.
At present, methods for reducing the concentration of ammonia nitrogen in biogas slurry wastewater are reported, and the traditional methods comprise an air stripping method, a chemical precipitation method, an ion exchange method, a membrane absorption method, a biological treatment method and the like, and all the methods have obvious effects on removing ammonia nitrogen. However, from the viewpoint of economic benefit, the traditional methods only aim at treating ammonia nitrogen in wastewater, are difficult to generate additional economic benefit, and bring many cost investments such as energy, biochemical agents, materials, reactors and the like.
Ammoniation treatment is a commonly used method for treating cellulose organic waste. The wastes are rich in lignin, cellulose, hemicellulose and other substances, and form crystals with high polymerization degree through mutual cross-linking, so that a complex fiber structure is formed, and the application of the wastes is limited to a certain extent. By adding biological and chemical agents and mixing with the biological and chemical agents to perform ammoniation, the aims of destroying the structure and improving the biodegradability can be achieved.
The anaerobic fermentation by using a single substrate has the limitations of the nutritional characteristics, the structure and the like of the material, and cannot meet the normal fermentation process. The mixed anaerobic fermentation technology is an anaerobic fermentation technology which takes two or more than two organic biomasses as substrates. The fermentation liquid buffering capacity is enhanced by mixing cellulose organic wastes with biogas residues to balance the nutrition in a fermentation system, C/N, pH and other factors influencing the anaerobic fermentation process, and the synergistic effect of microorganisms is improved, so that the biogas generation efficiency is effectively improved to different degrees, and the economic benefit of operation is improved. The dry anaerobic fermentation refers to an anaerobic fermentation technology with a solid content of a fermentation system of more than 20 percent. Compared with the wet anaerobic fermentation technology, the dry anaerobic fermentation technology has the following advantages: (1) higher volume loading rate; (2) the reaction water requirement is small, and the energy required for heating and stirring is small; (3) the water content of the fed and discharged materials is low, so that the subsequent treatment cost of the fermented biogas slurry wastewater is avoided; (4) the operation process is stable.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention aims to provide a method for realizing resource utilization of biogas residues and biogas slurry wastewater by utilizing a two-stage process.
The purpose of the invention is realized by the following technical scheme:
a method for realizing resource utilization of biogas residues and biogas slurry wastewater by utilizing a two-stage process comprises the following steps:
(1) performing anaerobic fermentation on the biomass, and performing solid-liquid separation to obtain biogas slurry wastewater with high ammonia nitrogen concentration and biogas residues;
(2) lignocellulose organic waste is used as a substrate, is uniformly mixed with the biogas slurry wastewater with high ammonia nitrogen concentration obtained by the separation in the step (1), and then is subjected to ammoniation pretreatment;
(3) adding the biogas residues separated in the step (1) into the system subjected to amination pretreatment in the step (2), then performing mixed dry anaerobic fermentation, and collecting methane;
the biomass in the step (1) can be at least one of human excrement, livestock excrement, poultry excrement, straws, weeds and the like;
the anaerobic fermentation condition in the step (1) is preferably normal-temperature fermentation for 40-50 days;
the ammonia nitrogen concentration of the high ammonia nitrogen concentration biogas slurry wastewater in the step (1) is preferably adjusted to be 1000-2000 mg/L;
the lignocellulose organic waste in the step (2) can be at least one of rice straw, corn straw, wheat straw and the like;
the lignocellulosic organic waste in step (2) is preferably pretreated as follows: drying, crushing to obtain particles with the particle size of below 2-3 cm, further crushing, and sieving with a 10-mesh sieve;
the drying can be natural air drying or drying and the like;
after the lignocellulose organic waste and the biogas slurry wastewater in the step (2) are mixed, the solid content in the system is preferably 18-22 wt%;
the uniform mixing in the step (2) is preferably fully and uniformly stirred until all the materials are wetted;
the condition of the ammoniation pretreatment in the step (2) is preferably 30.0 +/-2 ℃ until the concentration of free ammonia nitrogen is less than 212.77 mg/L;
the condition of the ammoniation pretreatment in the step (2) is further preferably 30.0 +/-2 ℃ ammoniation pretreatment until the concentration of free ammonia nitrogen is 18.43-169.60 mg/L;
the condition of the ammoniation pretreatment in the step (2) is further preferably 30.0 +/-2 ℃ ammoniation pretreatment for 4-6 days, if the pretreatment time is too long, microorganisms can excessively consume fermentation substrates, so that materials which can be utilized in the process of producing the methane are reduced, and the gas production effect is poor;
the ammoniation pretreatment in step (2) is preferably carried out in a fermentation tank;
the dosage ratio of the lignocellulose organic waste to the biogas residue in the step (3) is (1-3): (1-3) (in VS);
the condition of the mixed dry anaerobic fermentation in the step (3) is preferably medium-temperature fermentation for 55-65 days;
the condition of the mixed dry anaerobic fermentation in the step (3) is further preferably medium temperature fermentation for 60 days;
the temperature of the medium-temperature fermentation is preferably 30-45 ℃;
the solid content of the mixed dry anaerobic fermentation system in the step (3) is preferably adjusted to 20-30 wt%;
the invention mixes the lignocellulose organic waste and the biogas slurry wastewater containing high-concentration ammonia nitrogen, and carries out ammoniation pretreatment, wherein the lignocellulose organic waste plays roles in ammoniation, alkalization and neutralization, so as to achieve the purposes of greatly reducing the ammonia nitrogen concentration of the wastewater and improving the biodegradability of the cellulose organic waste. And after the pretreatment is finished, continuously adding biogas residues into the system according to a certain proportion, and carrying out mixed dry anaerobic fermentation to produce methane. The process has no subsequent biogas slurry waste water generation, does not need additional inoculation, can further realize energy utilization of organic matters in the biogas residues, and changes the idea of using the traditional biogas residues as fertilizers. Based on the cellulose organic waste ammoniation pretreatment technology and the dry anaerobic fermentation technology, the whole process is carried out in one reactor, the operation condition is mild, stirring is not needed in the reaction process, biogas slurry wastewater is not generated, and the method has the advantages of low cost, low energy consumption, less waste, simple operation, stable operation and the like (figure 1).
Compared with the prior art, the invention has the following advantages and effects:
(1) the whole process of the invention can be carried out in one reactor, and the infrastructure cost is low.
(2) The ammoniation pretreatment process of the invention does not need to add biological and chemical agents, and can reduce the cost of the reagent.
(3) The ammoniation pretreatment process has mild conditions, simple process and strong operability, and does not need to turn over and stir in the process.
(4) In the process of treating ammonia nitrogen in biogas slurry wastewater, the invention adopts lignocellulose organic waste as the substrate, improves the biodegradability of the straw and realizes the resource utilization of the biogas slurry wastewater.
(5) The mixed dry anaerobic fermentation process adopts medium-temperature fermentation, and the energy consumption is low.
(6) The dry anaerobic fermentation is adopted in the mixed dry anaerobic fermentation process, and the process does not need to turn over and stir.
(7) Compared with wet anaerobic fermentation, the method avoids the cost of solid-liquid separation, wastewater treatment and the like, has the advantages of large gas production per unit volume and no subsequent biogas slurry wastewater production, and can realize the resource utilization and the reduction utilization of the high ammonia nitrogen concentration biogas slurry wastewater.
(8) The invention has potential environmental benefit, social benefit and economic benefit, and has huge market and application potential in the aspects of wastewater treatment, waste resource conversion and utilization, and solid waste energy technology.
Drawings
FIG. 1 is a schematic flow chart of the present invention for realizing resource utilization of biogas residues and biogas slurry by using a two-stage process.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
(1) The pig manure biogas slurry is used as a treatment object. The pig manure for the test is taken from livestock research institute of agricultural academy of agricultural sciences, Guangdong province, the fetched pig manure is placed into a 10L white bottle, a proper amount of water is added until the pig manure in the bottle is fully mixed (the solid content of the system meets the wet anaerobic fermentation solid content condition (TS is less than or equal to 10wt percent)), a silica gel plug with a capillary stainless steel tube is used for sealing, a 5L aluminum-plastic composite film gas sampling bag is used for collecting the produced gas, the capillary stainless steel tube and the gas bag are connected by the silica gel tube, and the pig manure is piled and retted for 45 days at normal temperature (25 ℃);
(2) performing solid-liquid separation after the pig manure composting is finished to obtain pig manure biogas slurry wastewater and pig manure biogas residues, measuring the ammonia nitrogen concentration of the pig manure biogas slurry wastewater, and adjusting the ammonia nitrogen concentration to 2000.0mg/L by using deionized water for later use;
(3) taking rice straws as a representative of lignocellulose organic waste, taking the rice straws for testing from a certain farm in Shaxi town of Zhongshan city of Guangdong province, naturally drying the taken rice straws in the air, crushing the rice straws by using a hammer crusher until the particle size is 2-3 cm after the air drying, further crushing the rice straws by using a high-speed universal crusher, and sieving the crushed rice straws by using a 10-mesh sieve for later use;
(4) adding 80.0g of rice straws crushed in the step (3) and 300.0mL of pig manure biogas slurry wastewater with ammonia nitrogen concentration adjusted in the step (1) into a 1L white narrow-mouth bottle, and fully and uniformly stirring until all straws are soaked, wherein the solid content of the pretreatment system is 20.75 wt%; after fully mixing, sealing with kraft paper, putting into an electronic constant-temperature water bath kettle at 30 ℃, and performing ammoniation pretreatment for 4 days;
(5) after the ammoniation pretreatment is finished, the crushed rice straws are treated by the following steps: 3, pig manure biogas residue: 1 (calculated by VS), adding 90.0g of the pig manure biogas residues separated in the step (1) into the white narrow-mouth bottle of the pretreatment system in the step (4), fully mixing, and adding water to adjust the solid content of the system to 20 wt%; sealing with silica gel plug with capillary stainless steel tube, collecting gas with 3L aluminum-plastic composite membrane gas sampling bag, connecting capillary stainless steel tube and gas bag with silica gel tube, placing in 37.5 deg.C electronic constant temperature water bath, and mixing and dry anaerobic fermenting for 60 days.
Example 2
(1) The pig manure biogas slurry is used as a treatment object. The pig manure for the test is taken from livestock research institute of agricultural academy of agricultural sciences, Guangdong province, the fetched pig manure is placed into a 10L white bottle, a proper amount of water is added until the pig manure in the bottle is fully mixed (the solid content of the system meets the wet anaerobic fermentation solid content condition (TS is less than or equal to 10wt percent)), a silica gel plug with a capillary stainless steel tube is used for sealing, a 5L aluminum-plastic composite film gas sampling bag is used for collecting the produced gas, the capillary stainless steel tube and the gas bag are connected by the silica gel tube, and the pig manure is piled and retted for 45 days at normal temperature (25 ℃);
(2) and after the pig manure stack retting is finished, performing solid-liquid separation to obtain pig manure biogas slurry wastewater and pig manure biogas residues, measuring the ammonia nitrogen concentration of the pig manure biogas slurry wastewater, and adjusting the ammonia nitrogen concentration to 1500.0mg/L by using deionized water for later use.
(3) Rice straw is used as a representative of lignocellulosic organic waste. Taking rice straws for testing from a certain farm in Shaxi town of Zhongshan city, Guangdong province, naturally drying the taken rice straws in the air, crushing the rice straws to the particle size of 2-3 cm by using a hammer crusher after air drying, further crushing the rice straws by using a high-speed universal crusher, and sieving the crushed rice straws by using a sieve of 10 meshes for later use;
(4) adding 80.0g of rice straws crushed in the step (3) and 300.0mL of pig manure biogas slurry wastewater with ammonia nitrogen concentration adjusted in the step (1) into a 1L white narrow-mouth bottle, and fully and uniformly stirring until all straws are soaked, wherein the solid content of the pretreatment system is 20.75 wt%; after fully mixing, sealing with kraft paper, putting into an electronic constant-temperature water bath kettle at 30 ℃, and performing ammoniation pretreatment for 5 days;
(5) after the ammoniation pretreatment is finished, the crushed rice straws are treated by the following steps: 3, pig manure biogas residue: 1 (calculated by VS), adding 90.0g of the pig manure biogas residues separated in the step (1) into the white narrow-mouth bottle of the pretreatment system in the step (4), fully mixing, and adding water to adjust the solid content of the system to 20 wt%; sealing with silica gel plug with capillary stainless steel tube, collecting gas with 3L aluminum-plastic composite membrane gas sampling bag, connecting capillary stainless steel tube and gas bag with silica gel tube, placing in 37.5 deg.C electronic constant temperature water bath, and mixing and dry anaerobic fermenting for 60 days.
Example 3
(1) The pig manure biogas slurry is used as a treatment object. The pig manure for the test is taken from livestock research institute of agricultural academy of agricultural sciences, Guangdong province, the fetched pig manure is placed into a 10L white bottle, a proper amount of water is added until the pig manure in the bottle is fully mixed (the solid content of the system meets the wet anaerobic fermentation solid content condition (TS is less than or equal to 10wt percent)), a silica gel plug with a capillary stainless steel tube is used for sealing, a 5L aluminum-plastic composite film gas sampling bag is used for collecting the produced gas, the capillary stainless steel tube and the gas bag are connected by the silica gel tube, and the pig manure is piled and retted for 45 days at normal temperature (25 ℃);
(2) after the pig manure is retted, performing solid-liquid separation to obtain pig manure biogas slurry wastewater and pig manure biogas residues, measuring the ammonia nitrogen concentration of the pig manure biogas slurry wastewater, and adjusting the ammonia nitrogen concentration to 2000.0mg/L by using deionized water for later use;
(3) taking rice straws as a representative of lignocellulose organic waste, taking the rice straws for testing from a certain farm in Shaxi town of Zhongshan city of Guangdong province, naturally drying the taken rice straws in the air, crushing the rice straws by using a hammer crusher until the particle size is 2-3 cm after the air drying, further crushing the rice straws by using a high-speed universal crusher, and sieving the crushed rice straws by using a 10-mesh sieve for later use;
(4) adding 80.0g of rice straws crushed in the step (3) and 300.0mL of pig manure biogas slurry wastewater with ammonia nitrogen concentration adjusted in the step (1) into a 1L white narrow-mouth bottle, and fully and uniformly stirring until all straws are soaked, wherein the solid content of the pretreatment system is 20.75 wt%; after fully mixing, sealing with kraft paper, putting into an electronic constant-temperature water bath kettle at 30 ℃, and performing ammoniation pretreatment for 6 days;
(5) after the ammoniation pretreatment is finished, the crushed rice straws are treated by the following steps: 3, pig manure biogas residue: 1 (calculated by VS), adding 90.0g of the pig manure biogas residues separated in the step (1) into the white narrow-mouth bottle of the pretreatment system in the step (4), fully mixing, and adding water to adjust the solid content of the system to 20 wt%; sealing with silica gel plug with capillary stainless steel tube, collecting gas with 3L aluminum-plastic composite membrane gas sampling bag, connecting capillary stainless steel tube and gas bag with silica gel tube, placing in 37.5 deg.C electronic constant temperature water bath, and mixing and dry anaerobic fermenting for 60 days.
Comparative example (blank control)
(1) The pig manure biogas slurry is used as a treatment object. The pig manure for the test is taken from livestock research institute of agricultural academy of agricultural sciences, Guangdong province, the fetched pig manure is placed into a 10L white bottle, a proper amount of water is added until the pig manure in the bottle is fully mixed (the solid content of the system meets the wet anaerobic fermentation solid content condition (TS is less than or equal to 10wt percent)), a silica gel plug with a capillary stainless steel tube is used for sealing, a 5L aluminum-plastic composite film gas sampling bag is used for collecting the produced gas, the capillary stainless steel tube and the gas bag are connected by the silica gel tube, and the pig manure is piled and retted for 45 days at normal temperature (25 ℃);
(2) after the pig manure is piled and retted, carrying out solid-liquid separation to obtain pig manure biogas slurry wastewater and pig manure biogas residue for later use;
(3) taking rice straws as a representative of lignocellulose organic waste, taking the rice straws for testing from a certain farm in Shaxi town of Zhongshan city of Guangdong province, naturally drying the taken rice straws in the air, crushing the rice straws by using a hammer crusher until the particle size is 2-3 cm after the air drying, further crushing the rice straws by using a high-speed universal crusher, and sieving the crushed rice straws by using a 10-mesh sieve for later use;
(4) adding 80.0g of the crushed rice straws in the step (3) and 300.0mL of distilled water into a 1L white narrow-mouth bottle, fully and uniformly stirring until all the straws are soaked, sealing the bottle by kraft paper, putting the bottle into an electronic constant-temperature water bath kettle at the temperature of 30 ℃, and treating for 4, 5 or 6 days respectively;
(5) after the treatment is finished, according to the crushed rice straws: 3, pig manure biogas residue: 1 (calculated by VS), adding 90.0g of pig manure biogas residues separated in the step (1) into the white narrow-mouth bottle of the pretreatment system in the step (4), fully mixing, and adding water to adjust the solid content of the system to 20 wt%; sealing with silica gel plug with capillary stainless steel tube, collecting gas with 3L aluminum-plastic composite membrane gas sampling bag, connecting capillary stainless steel tube and gas bag with silica gel tube, placing in 37.5 deg.C electronic constant temperature water bath, and performing anaerobic fermentation for 60 days.
Effects of the embodiment
(1) Changes of ammonia nitrogen concentration, free ammonia nitrogen concentration and SCOD concentration in the system before and after the ammoniation pretreatment in the embodiments 1-3 are respectively detected according to a conventional method, and the results are shown in Table 1.
Wherein, after the ammoniation pretreatment in the embodiment 1 is finished, the total ammonia nitrogen concentration of the system is reduced from 1781.53mg/L to 335.74mg/L, and the removal rate is 81.15%; the concentration of free ammonia nitrogen is reduced from 511.17mg/L to 12.04mg/L, and the removal rate is 97.64%; the SCOD concentration increased from 20.96g/L to 35.87 g/L. After the ammoniation pretreatment is finished in the embodiment 2, the total ammonia nitrogen concentration of the system is reduced from 1353.60mg/L to 240.69mg/L, and the removal rate is 82.22%; the concentration of free ammonia nitrogen is reduced from 357.30mg/L to 4.87mg/L, and the removal rate is 98.48 percent; the SCOD concentration was increased from 15.72g/L to 31.33 g/L. Example 3 after the ammoniation pretreatment is finished, the total ammonia nitrogen concentration of the system is reduced from 1781.53mg/L to 215.45mg/L, and the removal rate is 87.91%; the concentration of free ammonia nitrogen is reduced from 511.17mg/L to 21.49mg/L, and the removal rate is 95.80 percent; the concentration of SCOD is increased from 20.96g/L to 32.64 g/L.
The results show that the ammonia nitrogen concentration of the biogas slurry wastewater is greatly reduced, the removal rate of free ammonia nitrogen concentration is high, the inhibition effect of the free ammonia nitrogen concentration on the growth and metabolism of microorganisms can be well controlled, and the activity of the microorganisms is improved. The concentration of SCOD is greatly increased, the cellulose structure of the straw is damaged, the biodegradability is improved, and meanwhile, higher SCOD can be directly utilized by microorganisms, so that the starting speed of subsequent dry anaerobic fermentation is increased.
Table 1 examples 1-3 ammonia nitrogen concentration, free ammonia nitrogen concentration, SCOD concentration in the system before and after the ammoniation pretreatment
(2) Analysis of methane production results
Example 1 after the anaerobic fermentation was completed, the maximum daily methane production was obtained on the sixth day, which was fifteen days earlier than that of the comparative example (no biogas slurry added, only 80.0g of rice straw and distilled water were treated for 4 days); the starting speed is greatly accelerated, and a second gas production peak is obtained in the twentieth day; the accumulated methane yield is 5.71L, which is improved by 275.66 percent compared with the comparative example (no biogas slurry waste water is added, only 80.0g of rice straws and distilled water are treated for 4 days); the cumulative methane yield in unit VS was 326.50 mL/(g.VS), which was 36.78% higher than that of the comparative example (no biogas slurry added wastewater, only 80.0g of rice straw and distilled water for 4 days). The system runs stably in the fermentation process, and no biogas slurry or odor is generated.
Example 2 after the anaerobic fermentation, the first peak of gas production is reached in the twelfth day, compared with the comparative example (no biogas slurry wastewater is added, only 80.0g of rice straw and distilled water are treated for 5 days), the maximum daily methane production is obtained ten days ahead of time, the starting speed is greatly accelerated, and the second peak of gas production is obtained in the twenty-second day; the accumulated methane yield is 4.24L, which is improved by 178.95 percent compared with the comparative example (no biogas slurry waste water is added, only 80.0g of rice straws and distilled water are treated for 5 days); the cumulative methane yield in unit VS was 274.57 mL/(g.VS), which was 15.03% higher than that in the comparative example (no biogas slurry added wastewater, only 80.0g of rice straw and 5 days of distilled water treatment). The system runs stably in the fermentation process, and no biogas slurry or odor is generated.
Example 3 after the anaerobic fermentation is finished, the maximum daily methane yield is obtained in the sixth day, compared with the comparative example (only 80.0g of rice straw and distilled water are treated for 6 days without adding biogas slurry wastewater), the maximum daily methane yield is obtained fifteen days ahead, the starting speed is greatly accelerated, and the second peak of gas production is obtained in the thirty-second day; the accumulated methane yield is 4.30L, which is improved by 182.89 percent compared with the comparative example (no biogas slurry waste water is added, only 80.0g of rice straws and distilled water are treated for 6 days); the cumulative methane yield in VS units was 261.63mL/(g · VS), which is 9.60% higher than the comparative example (no biogas slurry added wastewater, only 80.0g of rice straw and distilled water for 6 days). The system runs stably in the fermentation process, and no biogas slurry or odor is generated.
The traditional dry anaerobic fermentation has higher organic load, the gas yield per unit volume is higher than that of a wet method, but the starting time is slow, and the gas production potential per unit material is low.
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 (10)
1. A method for realizing resource utilization of biogas residues and biogas slurry wastewater by utilizing a two-stage process is characterized by comprising the following steps:
(1) performing anaerobic fermentation on the biomass, and performing solid-liquid separation to obtain biogas slurry wastewater with high ammonia nitrogen concentration and biogas residues;
(2) lignocellulose organic waste is used as a substrate, is uniformly mixed with the biogas slurry wastewater with high ammonia nitrogen concentration obtained by the separation in the step (1), and then is subjected to ammoniation pretreatment;
(3) adding the biogas residues separated in the step (1) into the system subjected to amination pretreatment in the step (2), then performing mixed dry anaerobic fermentation, and collecting methane.
2. The method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process according to claim 1, which is characterized in that:
the anaerobic fermentation condition in the step (1) is normal-temperature fermentation for 40-50 days.
3. The method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process according to claim 1, which is characterized in that:
and (2) adjusting the ammonia nitrogen concentration in the high ammonia nitrogen concentration biogas slurry wastewater in the step (1) to be 1000-2000 mg/L.
4. The method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process according to claim 1, which is characterized in that:
the lignocellulose organic waste in the step (2) is pretreated as follows: and (3) drying, crushing to obtain particles with the particle size of below 2-3 cm, and further crushing to obtain particles which are sieved by a 10-mesh sieve.
5. The method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process according to claim 1, which is characterized in that:
after the lignocellulose organic waste and the biogas slurry wastewater in the step (2) are mixed, the solid content in the system is 18-22 wt%.
6. The method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process according to claim 1, which is characterized in that:
the condition of the ammoniation pretreatment in the step (2) is that the ammoniation pretreatment is carried out at 30.0 +/-2 ℃ until the concentration of free ammonia nitrogen is less than 212.77 mg/L.
7. The method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process according to claim 6, which is characterized in that:
the condition of the ammoniation pretreatment in the step (2) is 30.0 +/-2 ℃ for 4-6 days.
8. The method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process according to claim 1, which is characterized in that:
the dosage ratio of the lignocellulose organic waste to the biogas residue in the step (3) is (1-3): (1-3) (in VS).
9. The method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process according to claim 1, which is characterized in that:
the mixed dry anaerobic fermentation in the step (3) is carried out for 55-65 days at medium temperature.
10. The method for realizing resource utilization of biogas residue and biogas slurry wastewater by using a two-stage process according to claim 1, which is characterized in that:
the solid content of the mixed dry anaerobic fermentation system in the step (3) is adjusted to be 20-30 wt%.
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