Method for treating livestock and poultry breeding liquid feces through freezing and thawing in cooperation with microbial agent

Abstract

The invention belongs to the field of agricultural waste treatment and environmental protection, and particularly relates to a method for treating livestock and poultry breeding liquid feces through cooperation of freezing and thawing and a microbial agent. The problem that ammonia nitrogen and other nutrients are easily lost in the treatment process formed by a common technology is solved. Comprising the following steps: step 1, feeding livestock and poultry liquid dung into a solid-liquid separator for separation, step 2, feeding the separated liquid dung into freeze-thaw integrated reaction equipment for freeze-thaw alternate treatment, step 3, adding a microbial agent into a reactor for inoculation, step 4, feeding the molten liquid dung into the inoculated reactor for biochemical treatment, and step 5, feeding the treated liquid dung into a solid-liquid separator for separation. The treated soil can be returned to the field for utilization. According to the method, the treatment process is simplified, the manure water treatment efficiency is improved, and sufficient nutrients in manure are reserved so as to realize field returning application.

Description

Technical Field

[0001] The invention belongs to the field of agricultural waste treatment and environmental protection, and in particular relates to a method for treating liquid manure from livestock and poultry breeding by using freeze-thaw coordinated microbial agents. Background Art

[0002] The livestock and poultry farming industry produces a large amount of liquid manure, which contains livestock and poultry feces, urine, feed residues and management flushing water. The liquid manure contains high levels of pollutants, pathogens and pathogens. Direct entry into the environment or improper treatment will pollute the environment, restricting the healthy development of the livestock and poultry farming industry. At the same time, liquid manure contains nutrients such as N and P, which can be used as irrigation water and liquid fertilizer to return to the fields. In order to ensure the safety of returning to the fields, liquid manure needs to be treated.

[0003] At present, the treatment methods for liquid livestock and poultry manure include anaerobic fermentation USR, CSTR, anaerobic fermentation + aerobic treatment, etc. However, there are problems such as high treatment cost, difficult and high cost of treatment, and easy loss of nutrients such as ammonia nitrogen during the treatment process, which hinders the initiative of livestock and poultry farmers or breeding enterprises in treating liquid manure.

[0004] Therefore, it is urgent to propose a method for treating liquid manure from livestock and poultry breeding using freeze-thaw synergistic microbial agents to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of nutrient loss such as ammonia nitrogen that is easily caused during the common technical treatment process. A brief summary of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this summary is not an exhaustive summary of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0006] The technical solution of the present invention:

[0007] A method for treating liquid manure from livestock and poultry farming using a freeze-thaw synergistic microbial agent comprises the following steps:

[0008] Step 1: Send livestock and poultry manure water into the solid-liquid separator for separation;

[0009] Step 2: Send the separated fecal water to the freeze-thaw integrated reaction equipment for freeze-thaw alternating treatment:

[0010] Step 3: Send the thawed manure water into the inoculated reactor and add microbial inoculants for biochemical treatment;

[0011] Step 4: After the biochemical treatment meets the standards, it can be returned to the field for use.

[0012] Preferably, the solid-liquid separator is a screening solid-liquid separator, a centrifuge, or a filter press solid-liquid separator.

[0013] Preferably, the reactor is one of an aerobic pond, an anaerobic pond, an anaerobic pond, an anaerobic reactor, and a soft / hard storage and fermentation integrated reactor.

[0014] Preferably, the total solid concentration of the fecal water after solid-liquid separation is 0-6%.

[0015] Preferably, the freezing temperature of the freeze-thaw integrated reaction equipment is 0 to -30°C, the freezing time is 6 to 18 hours, and the cooling rate is 5 to 20°C / min.

[0016] Preferably, the thawing temperature of the freeze-thaw integrated reaction equipment is 4-30°C, and the heating rate is 5-20°C / min.

[0017] Preferably, the microbial agent is one or more of Acinetobacter, Clostridium, Sporosarcina, Turicibacter, Bacteroides, Pseudomonas, and Trichococcus.

[0018] Preferably, the amount of microbial agent added is 100-350 million active bacteria / L livestock and poultry manure.

[0019] Preferably, the biochemical treatment temperature is 20-35°C and the treatment time is 2-90 days.

[0020] The present invention has the following beneficial effects:

[0021] The present invention simplifies the treatment process, improves the manure treatment efficiency, and retains sufficient nutrients in the manure to achieve field return application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a comparison chart of the effects of freezing and thawing on the separation time of manure and water;

[0023] Figure 2 This is a comparison chart of the effect of freezing and thawing on the thickness of the manure water sedimentation layer;

[0024] Figure 3 This is a graph showing the effect of adding bacterial agents on the appearance of manure water before and after freezing and thawing;

[0025] Figure 4 This is a comparison chart of the effect of adding bacterial agents on the pH of manure water before and after freezing and thawing;

[0026] Figure 5 This is a comparison chart of the effect of adding bacterial agents on the EC of manure water before and after freezing and thawing.

[0027] like Figure 1The TS of the manure water shown is 3%, and the added bacterial agents are 100% Acinetobacter, 100% Bacteroides and 100% Pseudomonas, and the amount of bacterial agent added is 250 million bacteria / L. The freezing temperature is -20℃, the freezing time is 16h, the thawing temperature is 25℃, and the thawing rate is 10℃ / min. Through freezing and thawing, the separation performance of manure water is improved, and the optimal separation time after freezing and thawing is reduced by 42.86%.

[0028] like Figure 2 The TS of the manure water shown is 3%, and the added bacterial agents are 100% Acinetobacter, 100% Bacteroides and 100% Pseudomonas, and the amount of bacterial agent added is 250 million bacteria / L. The freezing temperature is -20℃, the freezing time is 16h, the thawing temperature is 25℃, and the thawing rate is 10℃ / min. Through freezing and thawing, the organic matter or microbial structure in the manure water is destroyed, the sludge thickness is reduced, and the maximum thickness of the sludge precipitated after freezing and thawing is reduced by 5%.

[0029] like Figure 3 The TS of the manure water shown is 3%, and the added bacterial agents are 100% Acinetobacter, 100% Bacteroides and 100% Pseudomonas, and the amount of bacterial agent added is 250 million bacteria / L. The freezing temperature is -20℃, the freezing time is 16h, the thawing temperature is 25℃, and the thawing rate is 10℃ / min. The comparison after adding the bacterial agent for 1 day shows that the upper layer of the manure water treated by freeze-thaw treatment is clearer than that of the unfrozen-thawed one.

[0030] like Figure 4 The TS of the manure water shown is 3%, and the added bacteria are 100% Acinetobacter, 100% Bacteroides and 100% Pseudomonas, and the amount of bacteria added is 250 million bacteria / L. The pH value of the manure water treated by freeze-thaw treatment is higher after adding the bacteria for 8 days.

[0031] like Figure 5 The TS of the manure water shown is 3%, and the added bacteria are 100% Acinetobacter, 100% Bacteroides and 100% Pseudomonas, and the amount of bacteria added is 250 million bacteria / L. Comparison of EC after adding bacteria for 8 days shows that the EC of manure water treated with freeze-thaw treatment is lower than that of manure water not treated with freeze-thaw treatment, and the best reduction is 3.47%. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0033] Specific implementation method 1: Combination Figure 1-Figure 5 This embodiment is described. A method for treating liquid manure from livestock and poultry by freeze-thaw coordinated microbial agents in this embodiment comprises the following steps:

[0034] Step 1: Send livestock and poultry manure water into the solid-liquid separator for separation;

[0035] Step 2: Send the separated fecal water to the freeze-thaw integrated reaction equipment for freeze-thaw alternating treatment:

[0036] Step 3: Send the thawed manure water into the inoculated reactor and add microbial inoculants for biochemical treatment;

[0037] Step 4: After the biochemical treatment meets the standards, it can be returned to the field for use.

[0038] Specific implementation method 2: Combination Figure 1-Figure 5 The present embodiment is described as a method for treating liquid manure from livestock and poultry breeding by freeze-thaw synergistic microbial agents. The solid-liquid separator is one of a screening solid-liquid separator, a centrifuge, and a filter press solid-liquid separator. Appropriate equipment can be selected according to actual needs.

[0039] Specific implementation method three: Combination Figure 1-Figure 5 The present embodiment is described. The present embodiment is a method for treating liquid manure from livestock and poultry breeding using freeze-thaw synergistic microbial agents. The reactor is one of an aerobic pond, an anaerobic pond, an anaerobic pond, an anaerobic reactor, or a soft / hard storage and fermentation integrated reactor. When selecting a reactor, a comprehensive consideration can be given to factors such as the treatment object, treatment target, environmental conditions, and economic cost.

[0040] Specific implementation method four: Combination Figure 1-Figure 5 The present embodiment is described as a method for treating liquid manure from livestock and poultry by freeze-thaw coordinated microbial agents. The total solid concentration of the manure after solid-liquid separation is 0-6%.

[0041] Specific implementation method five: Combination Figure 1-Figure 5 The present embodiment is described as a method for treating liquid manure from livestock and poultry by freeze-thaw coordinated microbial agents. The freezing temperature of the freeze-thaw integrated reaction equipment is 0 to -30°C, the freezing time is 6-18h, and the cooling rate is 5 to 20°C / min, which can realize efficient and environmentally friendly treatment of liquid manure from livestock and poultry.

[0042] Specific implementation method six: Combination Figure 1-Figure 5 The present embodiment is described as a method for treating liquid manure from livestock and poultry by freeze-thaw coordinated microbial agents. The melting temperature of the freeze-thaw integrated reaction equipment is 4 to 30°C, and the heating rate is 5 to 20°C / min, which can achieve efficient and environmentally friendly treatment of liquid manure from livestock and poultry.

[0043] Specific implementation method seven: Combination Figure 1-Figure 5 The present embodiment is described as a method for treating liquid manure from livestock and poultry breeding using freeze-thaw synergistic microbial agents. The microbial agent is one or more of Acinetobacter, Clostridium, Sporosarcina, Turicibacter, Bacteroides, Pseudomonas, and Trichococcus, which are prepared through scientific proportioning and optimized process to better exert their biological activity and application effect.

[0044] Specific implementation method eight: Combination Figure 1-Figure 5 The present embodiment is described as a method for treating liquid manure from livestock and poultry breeding by freeze-thaw coordinated microbial agents, wherein the amount of microbial agents added is 100 to 350 million active bacteria / L of livestock and poultry manure to achieve efficient and economical treatment effects.

[0045] Specific implementation method nine: Combination Figure 1-Figure 5 The present embodiment is described as a method for treating liquid manure from livestock and poultry by freeze-thaw coordinated microbial agents, wherein the biochemical treatment temperature is 20 to 35° C. and the treatment time is 2 to 90 days.

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application is further described in detail. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0047] Example 1

[0048] Taking a small pig farm as an example, the pig manure water flushed from the pen with TS < 6% passes through the grille and sedimentation tank, and then enters the freeze-thaw reactor, where it is frozen at a cooling rate of 10℃ / min. After being completely frozen, it is kept for 6-8 hours and then thawed at 10℃ / min. The heat released by freezing is recycled to melt the ice in another parallel freeze-thaw reactor. The two reactors alternately use the freezing and thawing process to fully utilize the heat energy. The melted manure water was heated to 20-35℃ and then entered the storage tank. A bacterial agent consisting of Acinetobacter 0-1%, Clostridium 2%-5.62%, Pseudomonas 0-73.2%, Syntrophomonas 0-1.4%, Comamonas 0-5.25% and Paracoccus 0-10% was added. After aeration and stirring, COD was 1250mg / L after 30 days, the mortality rate of ascaris eggs reached 100%, the number of Escherichia coli per liter of treated manure water was negative, EC was 8.16mS / cm, pH was 8.40, EC was 8.16, and total nitrogen was 1.00×10 3 mg / L, total phosphorus (P2O5) is 0.0943%, total potassium (K2O) is 0.0912%, and it is diluted 4 times with water to irrigate dryland crops.

[0049] Example 2

[0050] Taking large and medium-sized dairy farms as an example, the TS of the collected dairy manure water is greater than 6%. After passing through the screw extruder, the solid is sent to the composting field, and the liquid enters the freeze-thaw device, where it is frozen at a cooling rate of 10°C / min. After being completely frozen, it is kept for 6-8 hours and then melted at 10°C / min. The heat released by freezing and the heat released by composting are recycled to thaw the ice in another freezing reactor. The two reactors alternately use the freezing and thawing processes to fully utilize the heat energy. The melted manure water is heated to 20-35°C, and then the entire amount of manure water enters the black film reactor, where it is mixed with the sludge in the reactor for biochemical reaction. The COD after 3 months is 3.29×10 4 mg / L, Escherichia coli negative, ascaris egg mortality rate 100%, pH 7.95, total salt content of 4.21mg / L, total nitrogen content of 0.15%, total phosphorus (P2O5) of 0.06%, total potassium (K2O) of 0.12%, no mercury and arsenic were detected, while the contents of other heavy metals lead, chromium, cadmium and copper were 0.06, 0.01, 0.01, 0.39 and 1.46mg / kg respectively, which met the requirements of GB / T25246 and can be returned to the field as basal fertilizer.

[0051] Example 3

[0052] The collected dairy manure (TS>6%) enters the collection tank and screw extruder, and the solid is sent to the composting site. The liquid enters the freeze-thaw device and is frozen at a cooling rate of 10℃ / min. After being completely frozen, it is kept for 6-8 hours and then melted at 10℃ / min. The heat released by freezing and the heat released by composting are recycled to thaw the ice in another freezing reactor. The two reactors alternately use the freezing and thawing processes to fully utilize the heat energy. The melted manure water is heated to 20-35℃, and then the manure water enters the anaerobic reactor in full, mixed with 10%-50% of the old biogas slurry in the reactor, and fermented at 35℃. The COD after 28 days is 3.74×10 4 mg / L, Escherichia coli negative, ascaris egg mortality rate 100%, pH 7.35, EC 23.1mS / cm, total nitrogen content is 0.38%, total phosphorus (P2O5) is 0.25%, total potassium (K2O) is 0.26%, the content of mercury and arsenic is 0.004 and 0.06mg / kg respectively, while other heavy metals such as lead, chromium and cadmium are not detected, which meets the requirements of GB / T25246 and can be returned to the field as basal fertilizer.

[0053] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for treating liquid manure from livestock and poultry by freeze-thaw coordinated microbial agents, characterized in that: The steps include: Step 1: Send livestock and poultry manure water into the solid-liquid separator for separation; Step 2: Send the separated fecal water to the freeze-thaw integrated reaction equipment for freeze-thaw alternating treatment: Step 3: Send the thawed manure water into the inoculated reactor and add microbial inoculants for biochemical treatment; Step 4: After the biochemical treatment meets the standards, it can be returned to the field for use.

2. The method for treating liquid manure from livestock and poultry breeding by freeze-thaw coordinated microbial agents according to claim 1, characterized in that: The solid-liquid separator is one of a screening solid-liquid separator, a centrifuge, and a filter press solid-liquid separator.

3. The method for treating liquid manure from livestock and poultry breeding by freeze-thaw coordinated microbial agents according to claim 1, characterized in that: The reactor is one of an aerobic pond, an anaerobic pond, an anaerobic pond, an anaerobic reactor, and a soft / hard storage and fermentation integrated reactor.

4. The method for treating liquid manure from livestock and poultry breeding by freeze-thaw coordinated microbial agents according to claim 1, characterized in that: The total solid concentration of the manure water after solid-liquid separation is 0-6%.

5. The method for treating liquid manure from livestock and poultry breeding by freeze-thaw coordinated microbial agents according to claim 1, characterized in that: The freezing temperature of the freeze-thaw integrated reaction equipment is 0 to -30°C, the freezing time is 6 to 18 hours, and the cooling rate is 5 to 20°C / min.

6. The method for treating liquid manure from livestock and poultry breeding by freeze-thaw coordinated microbial agents according to claim 1, characterized in that: The melting temperature of the freeze-thaw integrated reaction equipment is 4-30°C, and the heating rate is 5-20°C / min.

7. The method for treating liquid manure from livestock and poultry breeding by freeze-thaw coordinated microbial agents according to claim 1, characterized in that: The microbial agent is one or more of Acinetobacter, Clostridium, Sporosarcina, Turicibacter, Bacteroides, Pseudomonas, and Trichococcus.

8. The method for treating liquid manure from livestock and poultry breeding by freeze-thaw coordinated microbial agents according to claim 1, characterized in that: The amount of microbial agent added is 100 to 350 million active bacteria / L of livestock and poultry manure.

9. The method for treating liquid manure from livestock and poultry breeding by freeze-thaw coordinated microbial agents according to claim 1, characterized in that: The biochemical treatment temperature is 20-35°C and the treatment time is 2-90 days.

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