CN112341295A - Method for treating pig farm excrement and additive - Google Patents
Method for treating pig farm excrement and additive Download PDFInfo
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- CN112341295A CN112341295A CN202011090744.9A CN202011090744A CN112341295A CN 112341295 A CN112341295 A CN 112341295A CN 202011090744 A CN202011090744 A CN 202011090744A CN 112341295 A CN112341295 A CN 112341295A
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- Prior art keywords
- manure
- dicyandiamide
- pig farm
- calcium superphosphate
- composting
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
- C05B1/02—Superphosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F3/00—Fertilisers from human or animal excrements, e.g. manure
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/20—Liquid fertilisers
Abstract
The invention discloses a method for treating excrement in a pig farm and an additive. The disclosed method comprises the steps of carrying out solid-liquid separation on the pig farm manure to obtain solid manure and liquid manure; adding calcium superphosphate or dicyandiamide into the solid feces and then composting; adding dicyandiamide into the liquid manure and then standing; the provided additives comprise calcium superphosphate and dicyandiamide, and the calcium superphosphate and the dicyandiamide are packaged independently. SSP or DCD is added into pig manure compost, so that the degradation of organic matters can be accelerated, and the contents of total nitrogen and total phosphorus in compost products are improved, wherein the compost effect of the added SSP is good, and the compost can be used as a nitrogen fertilizer organic fertilizer for application; the dicyandiamide also has a good effect on the pretreatment of the liquid manure for resource utilization.
Description
Technical Field
The invention relates to a farm excrement treatment technology, in particular to a pig farm excrement treatment method and a corresponding additive.
Background
In recent years, with the continuous development of national economy and the higher standardization and scale degree of the breeding industry, the excrement of breeding enterprises becomes an important emission source of environmental pollution in China, and influences on the surrounding environment, the health of personnel and the like to a certain degree. Due to the problems of high excrement treatment cost, insufficient matching and digestion land for breeding excrement, imperfect environmental protection facilities and the like, part of the excrement is discharged to the ground surface and a water body without harmless treatment, and the surrounding environment and soil are polluted. Therefore, the method has important significance for accelerating the harmless treatment and resource utilization of the excrement, promoting the development of animal husbandry, promoting ecological civilization construction and the like. The treatment of the pig farm manure resources is not completely solved due to the limitations of treatment technology, effect, cost and other factors.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the invention provides a method for treating the excrement in a pig farm.
To this end, the method provided by the invention comprises the following steps:
carrying out solid-liquid separation on the pig farm manure to obtain solid manure and liquid manure;
adding calcium superphosphate or dicyandiamide into the solid feces and then composting;
adding dicyandiamide into the liquid manure and then standing.
Preferably, the composting is carried out in a closed environment and the standing treatment is carried out in a closed environment.
Optionally, the composting temperature is 30-38 ℃.
Optionally, the standing treatment is performed at room temperature for 13-15 days.
Optionally, 0.8-1.2% by mass of calcium superphosphate or 1% by mass of dicyandiamide is added into 4kg of the solid excrement; and dicyandiamide with the mass percentage of 0.8-1.2% is added into every 50mL of the liquid manure.
Further, the method also comprises composting the solid manure for use as crop fertilizer; the liquid manure is applied to crops after being treated.
Correspondingly, the invention provides a pig farm fecal sewage treatment additive. The provided additives comprise calcium superphosphate and dicyandiamide, and the calcium superphosphate and the dicyandiamide are packaged independently.
SSP or DCD is added into pig manure compost, so that the degradation of organic matters can be accelerated, and the contents of total nitrogen and total phosphorus in compost products are improved, wherein the compost effect of the added SSP is good, and the compost can be used as a nitrogen fertilizer organic fertilizer for application; the dicyandiamide also has a good effect on the resource utilization pretreatment of the pig farm solid-liquid separation sewage (liquid manure).
Drawings
FIG. 1 is a graph showing the effect of calcium superphosphate and dicyandiamide on the organic carbon content of solid manure in a pig farm;
FIG. 2 is a graph of the effect of calcium superphosphate and dicyandiamide on total nitrogen content in compost;
FIG. 3 is a graph of the effect of calcium superphosphate and dicyandiamide on the total phosphorus content of the compost;
FIG. 4 is the effect of dicyandiamide on the total nitrogen content in liquid manure in a pig farm, with the ordinate being the total nitrogen content in g/L;
FIG. 5 is the effect of dicyandiamide on the potassium content in liquid manure in a pig farm, with the potassium content on the ordinate in g/L;
FIG. 6 shows the effect of dicyandiamide on the total phosphorus content in liquid manure in a pig farm, with the ordinate representing the total phosphorus content in g/L.
The invention is described in further detail below with reference to the figures and the specific tests and methods of use given by the inventors.
Detailed Description
Solid manure compost in the pig farm manure treatment process and a series of harmful gases and greenhouse gases are generated in the sewage (liquid manure) treatment process, wherein the harmful gases mainly comprise NH3、CH4And N2O, and the like. The method not only reduces the agricultural value of the compost, but also seriously pollutes the atmosphere, harms human and animal health, aggravates global greenhouse effect, brings acid rain harm, water eutrophication and other problems. The invention reduces the nitrogen loss and greenhouse gas emission in the compost by adding proper additives, and particularly effectively reduces N by adding calcium superphosphate (SSP) in the composting process2O and CH4Discharging of (3); or adding dicyandiamide (DCD) to reduce N produced during nitration2O and NO are discharged into the air, so that the pollution of nitrate nitrogen to soil and water bodies due to leaching and runoff is reduced, and the nitrogen loss is reduced; the treated excrement can be used as organic fertilizer to be applied to soil and can be degraded into CO2、NH3And H2O, no soil pollution is caused; the total nitrogen content of liquid manure treated by DCD is obviously improved, the total phosphorus content and the potassium content are not obviously changed, the pH value and the conductivity are both in the standard range of organic fertilizer, and the in-situ resource utilization through a water-fertilizer integrated pipeline can be considered.
Example (b):
carrying out solid-liquid separation on the pig farm manure to obtain solid manure and liquid manure;
taking two parts of 4kg solid excrement, respectively adding 1% SSP and 1% DCD, and performing composting fermentation in a heat-preservation fermentation box at the heat-preservation temperature of 30-38 ℃.
Randomly sampling the treatment groups by the test samples at 0d and 45d respectively, wherein each time about 50g of the samples are sampled; and after sampling, placing the sample in the self-sealing bag after exhausting, hermetically placing the self-sealing bag in a refrigerator at the temperature of-20 ℃, and measuring each index after the test is finished. The detection indexes of each test sample are organic matter, total nitrogen and total phosphorus; the detection method adopts organic fertilizer agricultural standard NY525-2012 to determine.
As shown in figure 1, the organic carbon content of pig manure is changed before and after composting, and the organic carbon content is remarkably reduced after composting (P <0.05) compared with that before composting on the whole. Compared with the pre-composting group, the SSP treatment group, the DCD treatment group and the control group are respectively reduced by 12.64 percent, 15.79 percent and 8.38 percent; the degradation amount of organic carbon in the DCD treatment group is obviously higher than that in the SSP treatment group and the control group (P is less than 0.05), and the content of the organic carbon after treatment is 375.55 g/kg; the SSP treatment group has a significantly higher degradation amount than the control group (P <0.05), and the organic carbon content after composting is 390.48 g/kg.
FIG. 2 shows that the nitrogen content in the compost is reduced along with the discharge of ammonia gas in the composting process, but the total nitrogen concentration effect can occur along with the decomposition of organic matters, so that the total nitrogen content is increased; compared with the prior composting, the total nitrogen content of each treatment group after composting is obviously improved (P is less than 0.05); the total nitrogen content of the SSP treatment group is obviously higher than that of the DCD treatment group and the control group (P <0.05), and the total nitrogen content after treatment is 23.56 g/kg; the total nitrogen content of the DCD treatment group is obviously higher than that of the control group (P <0.05), and both SSP and DCD can play a nitrogen fixation effect.
FIG. 3 shows that the SSP treated group had higher total phosphorus content than the DCD treated group and the control group before composting (P < 0.05); the total phosphorus content of the composted SSP treatment group is obviously higher than that of the DCD treatment group and the control group (P is less than 0.05), and the total phosphorus content of the SSP treatment group reaches 15.43 g/kg; the total phosphorus content of the DCD treated group was significantly higher than the control group (P < 0.05).
The results show that SSP or DCD added in pig manure compost can accelerate the degradation of organic matters, improve the content of total nitrogen and total phosphorus in compost products, can be used as a nitrogen fertilizer organic fertilizer for application, and leads the content of total phosphorus in initial components to be higher by using SSP as exogenous phosphorus supplement brought by additives. With the progress of the composting process, the organic matters are continuously degraded, the phosphorus is concentrated, and the total phosphorus concentration is increased.
The liquid manure treatment method comprises the steps of taking 2L of liquid manure, and adding 1% of DCD; mixing, sealing, standing at room temperature while stirring, and observing for 14 days.
Stage sampling test, filtering with 0.22 μm filter membrane, and measuring pH and EC values with MP521 type pH meter and conductivity meter; drying in an oven at 105 deg.C, and measuring water content; the total nitrogen is measured by adopting a semi-micro Kelvin method; measuring total phosphorus by using a molybdenum-antimony colorimetric resistance method; the total potassium content was determined using atomic absorption analysis.
The total nitrogen content increased after addition of DCD, the difference between the test group and the control group was very significant from day 2 (38.21 ± 0.96 vs 65.50 ± 18.83, P <0.01), and the total nitrogen content of the treatment group tended to be stable, as shown in fig. 4.
After addition of DCD, the potassium content remained stable throughout the experiment and there was no significant difference between the DCD treated group and the control group (P >0.05), as shown in fig. 5.
Referring to fig. 6, the total phosphorus content showed an increasing trend 2 days prior to treatment, with the total phosphorus content in the DCD treated group being significantly higher than the control group on day 1 (P < 0.05); from day 3, the total phosphorus content in the wastewater rapidly decreased, and tended to be stable by day 7, in short, the total phosphorus content showed a trend of increasing and decreasing, and reached a peak by day 2, but both groups did not change significantly before and after treatment (P > 0.05).
In the natural fermentation process, the pH of all treatment groups is always in alkalescence and is 7.7-8.4, and no obvious difference exists (P is more than 0.05); the electric conductivity of the sewage 7 days before the treatment is higher than 4000 mus/cm, the electric conductivity of the DCD treatment group and the control group at 14 days is reduced to be below 4000 mus/cm, and the sewage 14 days after the liquid manure treatment of the embodiment can be normally applied.
Claims (7)
1. A method for treating excrement in a pig farm is characterized by comprising the following steps:
carrying out solid-liquid separation on the pig farm manure to obtain solid manure and liquid manure;
adding calcium superphosphate or dicyandiamide into the solid feces and then composting;
adding dicyandiamide into the liquid manure and then standing.
2. The method of treating swine waste according to claim 1, wherein the composting is performed in a closed environment and the standing treatment is performed in a closed environment.
3. The method of treating swine waste according to claim 1, wherein the composting temperature is 30-38 ℃.
4. The method of claim 1, wherein the standing treatment is performed at room temperature for 13 to 15 days.
5. The method for treating the pig farm manure according to claim 1, wherein 0.8 to 1.2 mass percent of calcium superphosphate or 1 mass percent of dicyandiamide is added to 4kg of the solid manure; and dicyandiamide with the mass percentage of 0.8-1.2% is added into every 50mL of the liquid manure.
6. The method of treating swine waste according to any one of claims 1-5, further comprising composting the solid manure for use as crop fertilizer; the liquid manure is applied to crops after being treated.
7. The additive for treating the excrement in the pig farm is characterized by comprising calcium superphosphate and dicyandiamide, wherein the calcium superphosphate and the dicyandiamide are independently packaged.
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| CN202011090744.9A CN112341295A (en) | 2020-10-13 | 2020-10-13 | Method for treating pig farm excrement and additive |
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| CN202011090744.9A CN112341295A (en) | 2020-10-13 | 2020-10-13 | Method for treating pig farm excrement and additive |
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Citations (5)
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| DE102004035742A1 (en) * | 2004-07-23 | 2006-03-16 | Skw Stickstoffwerke Piesteritz Gmbh | N-phenylphosphoric triamides, processes for their preparation and their use as agents for regulating or inhibiting enzymatic urea hydrolysis |
| CN101613223A (en) * | 2009-07-07 | 2009-12-30 | 吉林农业大学 | With calcium superphosphate is that amendment reduces the application method that ammonia discharges in the industrial composting of chicken manure is produced |
| CN103382071A (en) * | 2012-05-01 | 2013-11-06 | 西南民族大学 | System and method for treating manure in sheep culturing farm |
| CN108934848A (en) * | 2018-06-25 | 2018-12-07 | 上海新农饲料股份有限公司 | A kind of large-scale pig farm sewage water treatment method |
| CN110240262A (en) * | 2019-06-05 | 2019-09-17 | 华东理工大学 | A method of not only retaining ammonia nitrogen in livestock and poultry cultivation biological wastewater treatment process but also had removed antibiotic |
-
2020
- 2020-10-13 CN CN202011090744.9A patent/CN112341295A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004035742A1 (en) * | 2004-07-23 | 2006-03-16 | Skw Stickstoffwerke Piesteritz Gmbh | N-phenylphosphoric triamides, processes for their preparation and their use as agents for regulating or inhibiting enzymatic urea hydrolysis |
| CN101613223A (en) * | 2009-07-07 | 2009-12-30 | 吉林农业大学 | With calcium superphosphate is that amendment reduces the application method that ammonia discharges in the industrial composting of chicken manure is produced |
| CN103382071A (en) * | 2012-05-01 | 2013-11-06 | 西南民族大学 | System and method for treating manure in sheep culturing farm |
| CN108934848A (en) * | 2018-06-25 | 2018-12-07 | 上海新农饲料股份有限公司 | A kind of large-scale pig farm sewage water treatment method |
| CN110240262A (en) * | 2019-06-05 | 2019-09-17 | 华东理工大学 | A method of not only retaining ammonia nitrogen in livestock and poultry cultivation biological wastewater treatment process but also had removed antibiotic |
Non-Patent Citations (2)
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| 李素霞: "《土壤-蔬菜系统对氮镉互作效应的响应及其调控模式研究》", 30 November 2017, 武汉大学出版社 * |
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Application publication date: 20210209 |