Method for inhibiting odor emission in excrement storage process by using fermentation acidizing fluid

Abstract

The invention provides a method for inhibiting odor emission in a feces storage process by using fermentation acidizing fluid. According to the method, anaerobic fermentation acidizing fluid is added in the excrement storage process, the total acid concentration of the fermentation acidizing fluid is 30-120 mmol / L, the adding frequency is that the fermentation acidizing fluid is sprayed once every 12-48 h, and the spraying amount is 2-8 mL / kg; by means of the method, the emission amount of ammonia (NH3) in the excrement storage process can be reduced by 31.0%-47.0%, and the emission amount of hydrogen sulfide (H2S) can be reduced by 35.2%-96.7%; the method can greatly reduce nutrient element loss in the livestock and poultry manure storage process, is obvious in deodorization effect and high in operability, and has the potential of large-scale production.

Description

Technical Field

[0001] The invention relates to the fields of organic waste storage management, resource recycling and ecological environment, and in particular to a method for suppressing odor emission in a manure storage process by using fermented acidified liquid. Background Art

[0002] In the process of livestock manure management, due to the continuous decomposition of organic matter caused by microbial activity in manure, a large amount of malodorous gas (hereinafter referred to as "odor") is produced and released into the air, which has a serious impact on human and animal health and environmental quality, leading to many public health problems. At the same time, manure storage is the main link before the harmless treatment of farm manure such as aerobic composting or anaerobic fermentation. The storage time is generally 1 to 30 days, which is also a hot spot for odor generation.

[0003] The odor released during the storage of manure is mainly nitrogen-containing and sulfur-containing gases. Nitrogen-containing odorous gases mainly include ammonia (NH3) and nitrogen-containing organic matter. Among them, NH3 has a pungent odor (odor threshold 0.027mg / m 3 ), whose emission accounts for about 47% to 77% of the total nitrogen loss, is one of the most important odor-causing substances in the process of manure storage and is also the main way of nitrogen loss; sulfur-containing malodorous gases are mainly volatile sulfides, which are divided into volatile inorganic sulfides such as hydrogen sulfide (H2S) and carbon disulfide (CS2) and volatile organic sulfides such as methyl mercaptan (MT), methyl sulfide (DMS), and dimethyl disulfide (DMDS); among them, H2S is the volatile sulfide with the highest production in the process of manure storage, accounting for 39% to 43% of the total sulfur release, but its olfactory threshold (0.47×10 -3 mg / m 3 ) is low, so low concentrations of H2S can also produce a strong odor. In summary, it can be seen that the coordinated reduction of NH3 and H2S emissions in the storage process of organic waste is the core content of effectively controlling odor emissions.

[0004] As an alkaline gas, NH3 is extremely sensitive to pH. Cao et al. conducted a meta-analysis of a large amount of literature data and found that (Cao YB, Wang X, Bai ZH, Chadwick D, Misselbrook T, Sommer SG, Qin W, Ma L. Mitigation of ammonia, nitrous oxide and methane emissions during solid waste composting with different additives: Ameta-analysis [J]. Journal of Cleaner Production, 2019, 235: 626-635) that the effect of reducing NH3 emissions by acidic additives is significantly better than other additives, and it is also a common treatment technology that effectively reduces nitrogen loss. The generation of H2S is closely related to organic sulfur conversion and sulfate reduction pathways. On the one hand, the proteases and peptidases secreted by microorganisms can decompose sulfur-containing organic matter into sulfur-containing amino acids, which are then degraded and converted into MT, DMS and DMDS by microorganisms such as Pseudomonas putida. MT and DMS can produce H2S through degradation. On the other hand, during the storage of organic waste, local anoxic or anaerobic environments are easily formed inside the pile, which is conducive to the growth of sulfate-reducing bacteria. This type of microorganism is a key microorganism that metabolizes sulfur using sulfate as an electron acceptor. Sulfate is first reduced to sulfite, then to thiosulfate, sulfide, and finally converted to H2S. However, through the action of sulfur-oxidizing microorganisms, sulfide can be converted into sulfate or elemental sulfur, inhibiting the release of H2S into the air. Therefore, reducing the activity of Pseudomonas putida or increasing the action of sulfur-oxidizing microorganisms is an important way to effectively inhibit the production and emission of H2S. However, to date, there have been few reports on the synergistic reduction of NH3 and H2S in manure treatment.

[0005] Studies have found that appropriate initial C / N conditions, moisture conditions, forced aeration and other endogenous composting parameters can reduce NH3 and H2S emissions during the composting process, but these operations are difficult to achieve during temporary storage of manure and sewage, and the parameters often conflict. Therefore, acidic additives are the most important strategy to achieve synergistic reduction of NH3 and H2S emissions during temporary storage of manure and sewage. Commonly used acidic additives include acid salts and inorganic acids, but they have high processing costs, serious secondary pollution, and potential safety hazards (such as sulfuric acid, phosphoric acid, hydrochloric acid, etc.). Organic acids such as oxalic acid, citric acid, and lactic acid have certain acidity, safety, and environmental friendliness. In recent years, some scholars have applied them in the process of reducing NH3 emissions from manure storage (Liu Juan, Bai Zhaohai, Cao Yubo, Zhang Nannan, Zhao Zhanqing, Ma Lin. Effects of surface acidification of manure and urine in livestock pens on ammonia emissions. Chinese Journal of Eco-Agriculture (Chinese and English), 2019, 27(5): 677-685); Liu Juan, Wang Xuan, Cao Yubo, Bai Zhaohai, Ma Lin. Research and application of ammonia emission reduction technology by acidification of manure and sewage in livestock pens [J]. Chinese Journal of Eco-Agriculture (Chinese and English), 2023, 31(2): 290-299). However, in the currently reported methods, the commonly used organic acids are used in large amounts, and the synergistic reduction effect of NH3 and H2S is not obvious. The prices are generally high, which increases the processing cost. Therefore, exploring new organic acids with low cost and good effect to reduce odor emissions in the process of manure storage has become a technical problem that needs to be solved urgently in this field. At present, there is no report on the research of using fermentation acidified liquid to inhibit the generation and emission of odors such as NH3 and H2S. Summary of the invention

[0006] In view of the above problems, the present invention provides a method for inhibiting the generation of odor during the storage process of organic waste by using fermentation acidified liquid, so as to synergistically reduce the emission of NH3 and H2S, reduce the serious impact of odor on human and animal health and environmental quality, and improve resource utilization efficiency.

[0007] Specifically, the above invention object is achieved through the following technical solutions:

[0008] First, the present application provides a method for inhibiting the generation of odor during the storage process of organic waste using fermented acidified liquid, comprising the following steps:

[0009] 1) Crush the organic waste to about 2 cm as fermentation raw material;

[0010] The organic waste includes at least one of straw, tail vegetables, distiller's grains and other acidic materials, and the fermentation raw materials do not need to adjust the carbon-nitrogen ratio;

[0011] 2) subjecting the raw material obtained in step 1) to anaerobic fermentation: placing the fermentation raw material into a fermentation device, adding the fermentation inoculum, mixing and sealing, adjusting the moisture content to more than 90%, and conducting anaerobic fermentation at 25-40° C. for 3-7 days;

[0012] In this application, the fermentation device uses a commercially available anaerobic fermentation tank, and the heating method is selected according to the actual situation, such as water bath, electric heating, etc.;

[0013] In this step, the activated sludge is obtained by anaerobic fermentation, and there is no restriction on its source. It is a conventional inoculum in the field. It can be the activated sludge obtained by anaerobic fermentation of tail vegetables or crop straw at medium temperature (35±2°C), or the activated sludge produced by anaerobic fermentation of conventional sewage treatment plants or biogas projects; the amount of activated sludge added is about 15% (v / v); in a specific implementation, the fermentation material accounts for 80% (v / v) of the total volume of the reactor; the above 3) after the fermentation is completed, the fermentation liquid and the residue are separated, and the separated fermentation liquid is evenly sprayed on the surface of the manure, the spraying amount is 2-8mL / kg, and the spraying frequency is once every 12-48h until the storage is completed, which can inhibit the odor emission during the manure storage process and achieve the coordinated reduction of NH3 and H2S emissions; the manure storage time is generally 1-30d.

[0014] In the present application, the fermentation liquid used in step 3) is the liquid (acidified liquid) after solid-liquid separation after anaerobic fermentation of tail vegetables, which contains microorganisms such as acid-producing bacteria, hydrogen-producing and acetic acid-producing bacteria, and its total organic acid content is generally 30 to 120 mmol / L, of which acetic acid accounts for more than 90%; the residual solid after solid-liquid separation can be used as fermentation inoculant or subsequent composting. The acidified liquid prepared by the method is rich in acetic acid (CH3COOH), which can react with NH3 molecules for neutralization and condensation. Organic acid acidification is not conducive to the activity of Pseudomonas putida, thereby inhibiting the degradation of sulfur-containing organic matter by microorganisms such as Pseudomonas putida into MT, DMS and DMDS, etc., reducing the substrate for H2S production. At the same time, organic acids contain microorganisms such as acid-producing bacteria, hydrogen-producing and acetogenic bacteria, which may promote sulfur-oxidizing bacteria to convert sulfide into sulfate or elemental sulfur, reducing the release of H2S. In addition, the soluble organic matter (DOM) in the acidified liquid is rich in functional groups such as phenolic hydroxyl and carboxyl, which is conducive to odor adsorption, thereby achieving the synergistic reduction of NH3 and H2S.

[0015] In the present application, the term "odor" includes but is not limited to at least one of NH3 and H2S; the manure storage process refers to the temporary storage of manure and sewage in livestock and poultry farms, composting plants or centralized waste treatment centers, and the storage time is generally 1 to 30 days.

[0016] Compared with the existing method for reducing the emission of NH3 and H2S in the storage process of organic waste, the method of the present invention has the following beneficial effects:

[0017] 1) The present application uses anaerobic fermentation acidified liquid to treat livestock and poultry manure, which can effectively reduce the emissions of NH3 and H2S at the same time and effectively remove the odor during the storage of manure; the acid solution is easy to prepare and operate, can inhibit the growth of Pseudomonas foetida microorganisms in the fermentation pile, promote the growth of sulfur-oxidizing microorganisms, and has a good synergistic inhibitory effect on the emissions of NH3 and H2S during the storage of manure. The emission reductions are 31.0% to 47.0% and 35.2% to 96.7%, respectively, which are significantly higher than the existing reports of using ordinary organic acids to reduce emissions by 17-25% (NH3) and 12-45% (H2S).

[0018] 2) The method for preparing organic acid of the present invention is simple and has no risk of secondary pollution. The acidified liquid used is obtained by anaerobic digestion and fermentation of organic waste such as tail vegetables, straw, and acid-type waste residue. The organic acid production efficiency is high, which is beneficial to the harmless treatment of waste and its conversion into beneficial substances and can greatly reduce the loss of nutrient elements during the storage of manure, which is beneficial to its subsequent resource utilization and realizes the coordination of odor emission reduction and recycling of waste resources.

[0019] 3) The spraying amount of the acidified liquid in this application is small and the stability is high, which reduces the difficulty of operation and the energy consumption of processing; the material obtained after the treatment of this application is generally used as a raw material for organic fertilizer or biogas fermentation. On the one hand, the acidification treatment of the material is beneficial to reduce greenhouse gas emissions in the aerobic composting process and promote the formation of humic acid. On the other hand, it can enhance the acid and biogas production capacity of anaerobic fermentation and improve industrial efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the test device;

[0021] (A) Diagram of anaerobic fermentation device; 1-sampling port, 2-fermentation tank, 3-gas sampling bottle, 4-exhaust port, 5-gas pipe, 6-gas collecting bottle, 7-water pipe, 8-water collecting bottle, 9-constant temperature water tank.

[0022] (B) Actual photo of the odor collection device.

[0023] Figure 2 NH3 and H2S emission dynamics and cumulative emission statistics after the fermentation acidification liquid was sprayed;

[0024] The red arrows indicate the spraying time. The differences among the treatment groups were analyzed using one-way ANOVA. Different lowercase letters indicate significant differences among the treatments (P<0.05).

[0025] Figure 3 The statistical results of the effect of the amount and frequency of spraying of fermented acidified liquid on NH3 emission during chicken manure storage; (A) spray once every 12 hours; (B) spray once every 24 hours; (C) spray once every 48 hours;

[0026] The differences between the acetic acid control group and the experimental group were analyzed using paired sample t-test; ** and *** indicate that the differences between the treatment group and the control group are extremely significant (P<0.01 and 0.001), respectively.

[0027] Figure 4 The statistical results of the effect of the amount and frequency of spraying of fermented acidified liquid on H2S emission during chicken manure storage; (A) spraying once every 12 hours; (B) spraying once every 24 hours;

[0028] The differences between the acetic acid control group and the experimental group were analyzed using paired sample t-test; ns, *, ** and *** indicate that the differences between the treatment group and the control group were not significant (P>0.05), significant (P<0.05) and extremely significant (P<0.01 and 0.001), respectively. DETAILED DESCRIPTION

[0029] The present invention is further described in detail with reference to the accompanying drawings and embodiments:

[0030] The activated sludge in the embodiment is obtained by anaerobic fermentation of tail vegetables at medium temperature (35±2°C) at the Liuhe test base of the applicant. In specific implementation, activated sludge produced by anaerobic fermentation of sewage treatment plants or biogas projects can also be used.

[0031] Example 1

[0032] The preparation of fermentation acidified liquid comprises the following steps:

[0033] (1) Preparation of fermentation material: Crush cabbage and tomatoes to about 2 cm, add about 15% (v / v) activated sludge, mix well, and obtain fermentation material.

[0034] The basic parameters of the experimental raw materials and the activated sludge inoculated in this example are shown in Table 1; Method for determining the total organic matter and total nitrogen content: The fresh sample was air-dried and ground to pass through an 80-mesh sieve for later use. The total organic matter was determined by potassium dichromate oxidation method, and the total nitrogen was determined by Kjeldahl nitrogen determination method (for relevant detection methods, see the national standard organic fertilizer, NY / T525-2021).

[0035] Table 1 Basic properties of fermentation raw materials

[0036] Fermentation raw materials Moisture content (%) Total organic carbon (mg / g) Total nitrogen (mg / g) Carbon Nitrogen Ratio Kale 91.9±0.2 455.4±1.8 21.3±0.03 21.4 tomato 95.2±0.08 453.4±0.4 16.6±0.07 27.2 Activated sludge 97.1±0.5 26.9±0.5 33.6±0.5 0.8 Chicken manure 78.31±0.3 302.7±0.04 28.9±0.2 10.5

[0037] Note: Mean ± standard error (n = 3)

[0038] (2) Preparation of fermentation acidified liquid: The fermented material obtained in step (1) is subjected to anaerobic fermentation treatment. The device uses a 10L homemade fermentation tank with a filling degree of about 80%. In specific implementation, other conventional or commercially available anaerobic fermentation tanks can also be used.

[0039] The fermentation tank structure is as follows Figure 1 As shown in (A), the fermentation tank 2, the water collecting bottle 6 and the water collecting bottle 8 are all sealed tanks, which are connected by a conduit arranged on the top; the fermentation tank 2 is placed in a constant temperature water tank 9, the top of the fermentation tank 2 is sealed and provided with two conduits, one of which is provided with a valve, one end of which is close to the top of the fermented material, and the other end is a sampling port 1; one end of the other conduit is located at the top of the fermentation tank 2, and the other end is provided at the top of the water collecting bottle 6 as an air guide tube 5; a gas sampling bottle 3 is provided on the air guide tube 5 near the end of the fermentation tank 2, and an exhaust port 4 with a valve is provided on the air guide tube 5 between the gas sampling bottle 3 and the water collecting bottle 6; a water guide tube 7 is provided between the water collecting bottle 6 and the water collecting bottle 8, one end of the water guide tube 7 is immersed in the liquid in the water collecting bottle 6, and the other end is located above the liquid in the water collecting bottle 8.

[0040] The total solid content (TS) of the GL and FQ fermentation systems was 6% and 4% respectively, the fermentation temperature was 35°C, the water bath heating method was adopted, and the fermentation time was 5 days. The basic parameters of the fermentation acidified liquid in this embodiment are shown in Table 2:

[0041] Table 2 Basic properties of fermentation acidified liquid

[0042]

[0043] Note: Mean ± standard error (n = 3)

[0044] In the specific implementation process, the fermentation material in step (1) can also be selected from one or more organic wastes such as tail vegetables, straw, acidic waste residue, etc., and the moisture content of the fermentation material is not less than 90%, which can achieve the purpose of the present invention.

[0045] Example 2

[0046] The fermentation acidified liquid in Example 1 was used to inhibit the generation of odor during the storage of organic waste. The static simulation reactor used for storing feces in this example is a 12 cm diameter, 2 L volume, and sealed plastic barrel with a lid; a three-way valve is installed on the top of the lid for gas collection. The actual photo is shown in Figure 1 The manure in the embodiment was taken from a certain scale laying hen farm in Zhenjiang City, Jiangsu Province.

[0047] The method comprises the following steps: adjusting the total acid content of the cabbage fermentation acidified liquid (GL) and the tomato fermentation acidified liquid (FQ) obtained in Example 1 to the same concentration (32mmol / L), spraying them onto the surface of chicken manure, and referring to the method disclosed in "Liu Juan, Wang Xuan, Cao Yubo, Bai Zhaohai, Ma Lin. Research and Application of Acidification and Ammonia Emission Reduction Technology for Manure in Farm Pens [J]. Chinese Journal of Eco-Agriculture (Chinese and English), 2023, 31(2): 290-299". The spraying amount is 4mL / kg, the frequency is once every 24h, and the spraying is continuous for 4 times. At the same time, the treatment of spraying commercial acetic acid (YS) and pure water (CK) is set as the control group. After spraying, the emissions of NH3 and H2S from the pile are measured. The determination method is as follows:

[0048] (1) NH3 emissions:

[0049] Sampling and determination method: The sampling method adopts the boric acid absorption method: Pour 20ml of 2% boric acid into a 50mL beaker, place the beaker in a static simulation reactor, and seal it for 1h. After 1h, take out the beaker, use a pipette to draw 5mL of boric acid absorption liquid into a colorimetric tube, add 5ml of phenol and sodium hypochlorite respectively, cover the lid and let it stand for 2h, then dilute to 50ml with distilled water, adjust the wavelength of the spectrophotometer to 625nm, use distilled water to zero, measure the sample, and record the data.

[0050] The calculation formula of NH3 emission flux is as follows:

[0051]

[0052] Where, F is the emission flux of NH3, mg / kg / h; C is the ammonia nitrogen concentration in the dilution solution, mg / L; 0.02 is the volume of the boric acid absorption solution, L; 17 is the relative molecular mass of NH3; M is the mass of pig manure in each test bucket in the test, kg; t is the NH3 absorption time, min; 14 is the relative molecular mass of N; 60 is the number of minutes per hour;

[0053] The cumulative NH3 emissions are calculated by weighting the emission rate by time interval using the following formula:

[0054]

[0055] Where, T is the cumulative emission of NH3, mg / kg; F i and F i+1 is the emission flux of the i-th and i+1-th times, mg / kg / h; D i and D i+1 is the i-th and i+1-th sampling time, h.

[0056] (2) H2S emissions:

[0057] Sampling and determination method: After spraying the fermentation acidified liquid, the lid was immediately closed and sealed. After sealing, the gas was collected with a 100 mL needle tube with a three-way valve and stored in a 100 mL gas collection bag (LBD-100 mL, Shanghai Shenyuan Scientific Instrument Co., Ltd., China). The collection time was 0, 5, 10, and 15 minutes after sealing. After the gas collection was completed, the H2S concentration was determined using a gas chromatograph (GC9890AS, Shanghai Star Analytical Instrument Co., Ltd., China).

[0058]

[0059] In the formula, F H2S is the emission flux of H2S, mg / kg / h; 60 is the number of minutes per hour, min / h; H is the height from the surface of the feces to the mouth of the jar, cm; 34.08 is the molar mass of H2S, g / mol; 8.21 is the gas volume conversion factor; K is the slope of the linear equation of gas concentration, ppm / min; T is the temperature during gas sampling, ℃; 0.011 is the surface area of ​​1 kg of feces under this test device, m 2 .

[0060] The cumulative H2S emissions refer to formula (3).

[0061] The test results are as follows Figure 2 As shown: After spraying the fermentation acidified liquid, the NH3 emission flux was greatly reduced ( Figure 2 During the 96-hour test, the cumulative NH3 emissions of each treatment were 29.6, 24.15, 15.37 and 12.80 mg / kg ( Figure 2 Compared with CK, the cumulative NH3 emissions decreased by 48.1% and 56.8% after spraying GL and FQ, respectively, with significant decreases (P<0.05); compared with YS, the cumulative NH3 emissions decreased by 36.4% and 47.0% after spraying GL and FQ, respectively, with significant decreases (P<0.05). Spraying fermented acidified liquid had a significant inhibitory effect on H2S emissions ( Figure 2 During the 96-hour test period, the cumulative H2S emissions of each treatment were 0.077, 0.076, 0.019, and 0.024 mg / kg, respectively. Figure 2 (D in the figure). Compared with CK, the cumulative H2S emissions decreased by 75.3% and 69.0% after spraying GL and FQ, respectively, with significant decreases (P<0.05); compared with YS, the cumulative H2S emissions decreased by 74.9% and 68.5% after spraying GL and FQ, respectively, with significant decreases (P<0.05). It can be seen that spraying fermented acidified liquid can effectively inhibit the emission of NH3 and H2S during manure composting, and the effect is significantly better than conventional chemical reagent acetic acid.

[0062] Example 3

[0063] The selection of the amount and frequency of spraying the fermentation acidified liquid includes the following steps:

[0064] The treatment with the fermented acidified cabbage liquid (GL) prepared in Example 1 was used as a representative, and the treatment with commercially available acetic acid (YS) was used as a control. The spraying method was the same as that in Example 2, and the spraying amount was set to 2, 4, and 8 mL / kg; under the same spraying amount, the spraying frequency was once every 12, 24, and 48 hours. After spraying, the emission of NH3 and H2S from the pile was measured by referring to the method in Example 2.

[0065] Table 3 Effect of different spraying amount and frequency of cabbage fermented acidified liquid on NH3 and H2S emission reduction Unit: %

[0066]

[0067]

[0068] During the 96h test period, the cumulative NH3 emissions from each treatment were as follows: Figure 3 As shown: It can be seen that spraying GL can significantly (P<0.01 and 0.001) reduce the NH3 emission of the pile. Among them, the inhibitory effect of spraying amount on NH3 emission of the pile is significantly better than that of spraying frequency (Table 3).

[0069] During the 96h test period, the cumulative H2S emissions from each treatment were as follows: Figure 4 As shown in the figure, the spraying amount generally has a good inhibitory effect on H2S emission. The H2S emission of the treatment with a spraying amount of 8mL / kg is significantly lower than that of other application amounts. Compared with the YS control, spraying GL every 24h can significantly (P<0.001) reduce the H2S emission of the pile. Figure 4 The emission reduction effect is also better than other spraying frequency treatments ( Figure 4 (shown in A).

[0070] The emission reduction effects of different spraying amounts and spraying frequencies of cabbage fermented acidified liquid on NH3 and H2S are shown in Table 3. Considering the emission reduction effects of the two main odors, from the perspectives of energy consumption and labor costs, the recommended spraying strategy is: the spraying amount is 8mL / kg, and it is sprayed once every 24h.

[0071] Although the above embodiments have been described in detail with general descriptions and specific embodiments of the present invention, it is obvious to those skilled in the art that some modifications or improvements can be made thereto on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for suppressing odor emission during the storage process of manure and sewage using fermented acidified liquid, characterized in that: The specific steps are as follows: 1) crushing the organic waste and using it as fermentation raw material; the organic waste is an acidic material; 2) Load the fermentation raw materials into the fermentation tank, add activated sludge, adjust the moisture content of the fermentation materials to more than 90%, and perform anaerobically fermentation at 25-40℃ for 3-7 days; 3) After fermentation, separate the fermentation liquid and the residue, and spray the separated fermentation liquid evenly onto the surface of the manure at a spraying amount of 2-8 mL / kg and a spraying frequency of once every 12-48 hours until the storage is completed, which can inhibit odor emissions during the manure storage process.

2. The method for suppressing odor emission during the storage of feces and sewage using fermented acidified liquid according to claim 1, characterized in that: The acidic material in step 1) includes at least one of straw, waste vegetables and distiller's grains.

3. The method for suppressing odor emission during storage of feces and sewage using fermented acidified liquid according to claim 1, characterized in that: The fermentation material in step 2) accounts for 80% of the total volume of the fermentation tank.

4. A method for suppressing odor emission during storage of feces and sewage using fermented acidified liquid according to claim 1, characterized in that: Step 2) The fermentation inoculum added refers to activated sludge, and the added amount is 15% of the volume ratio of the fermentation raw material.

5. A method for suppressing odor emission during manure storage using fermented acidified liquid according to claim 1, characterized in that: The odor in step 3) includes NH3 and H2S.

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