阅读说明：本技术 牛粪水养分的固持方法 (Method for fixing nutrients in cow dung ) 是由 赵立欣 丁京涛 沈玉君 孟海波 张朋月 程红胜 刘森泓 于 2019-11-20 设计创作，主要内容包括：本发明提供了一种牛粪水养分的固持方法,包括向调节池中的牛粪水中缓慢加入过磷酸钙并持续搅拌,调节牛粪水的pH值至6.0-6.5范围内；过磷酸钙的加入量为牛粪水质量分数的2-15％。本发明可以降低粪水贮存过程中7.6-21.3％的氨气排放通量,提升粪水肥效,同时粪水中的粪大肠菌群数符合国家标准要求,且粪水添加过磷酸钙贮存后还田施用,可提高农作物产量,减少农田中氨气排放和氮素淋溶损失,具有良好的生态环境效益。(The invention provides a method for fixing cow dung nutrient, which comprises slowly adding calcium superphosphate into cow dung in a regulating tank, continuously stirring, regulating pH value of the cow dung to 6.0-6.5, wherein the adding amount of the calcium superphosphate is 2-15% of the mass fraction of the cow dung, the method can reduce 7.6-21.3% of ammonia emission flux in the storage process of the cow dung, improve the fertilizer efficiency of the cow dung, ensure that the number of fecal coliform groups in the cow dung meets the national standard requirement, and the manure water is added with the calcium superphosphate, stored and returned to the field for application, thereby improving the crop yield, reducing ammonia emission and nitrogen leaching loss in farmlands, and having good ecological environmental benefit.)

1, method for fixing cow dung nutrient, which is characterized in that calcium superphosphate is slowly added into cow dung water in an adjusting pool and is continuously stirred, the pH value of the cow dung water is adjusted to be 6.0-6.5, wherein the adding amount of the calcium superphosphate is 2-15% of the mass fraction of the cow dung water.

2. The method for holding cow dung nutrients according to claim 1, wherein: and introducing the cow dung water added with the calcium superphosphate into a storage pool for storage for at least 30 days.

3. The method for holding cow dung water nutrient according to claim 1 or 2, wherein: the adding amount of the calcium superphosphate is 6-8% of the mass fraction of the cow dung water.

4. The method for holding cow dung water nutrient as claimed in claim 1, wherein the cow dung water includes or more kinds of liquid components of the liquid.

5. The method for holding cow dung nutrients according to claim 1, wherein: the original pH value of the cow dung is 6.5-8.5, and the solid content is less than 5%.

6. The method for holding cow dung nutrients according to claim 1, wherein: the particle size of the calcium superphosphate is less than 80 meshes; and is added into the cow dung water in a slow splashing way.

7. The method for holding cow dung nutrients according to claim 1, wherein: and a floating cylinder type stirrer is arranged in the adjusting tank.

Technical Field

The invention relates to the technical field of agricultural waste resource utilization, in particular to a holding method of cow dung water nutrient.

Background

With the rapid development of large-scale breeding in China, the discharge amount of cow dung is increased rapidly, pig farms generally clean dung in a dung drying and cleaning mode, the generated water separation amount is relatively small, but the quantity of the dung generated by the cow farms, particularly dairy farms, is relatively large, and the dung generated by the cow farms is high in solid content and difficult to treat, so that the dung is which is an important discharge source for agricultural non-point source pollution and discharge of greenhouse gases and ammonia gases.

At present, 2 modes of returning the treated liquid dung after anaerobic fermentation and storage and directly storing the liquid dung to the field are mainly used for treating the liquid dung, wherein the advantages of the generated biogas serving as clean energy resources become the main mode of liquid dung utilization which is vigorously promoted in China, but in the production of the anaerobic fermentation of the liquid dung, the equipment maintenance cost is high, and meanwhile, the biogas produced by a small-scale cultivation farm does not have the economic value of utilization, so that a lot of biogas is directly discharged into the atmosphere, thereby causing environmental pollution, in the aspect of directly storing and returning the liquid dung, because the liquid dung contains a large amount of urea, the urea is decomposed to generate a large amount of ammonium ions, and the accumulated ammonium ions in the liquid dung release a large amount of ammonia gas to pollute the environment, the liquid dung is alkaline under the condition that a large amount of ammonium ions exist, the ammonium ions in the liquid dung can be stored for a long time by adding acid into the liquid dung, the fertilizer efficiency of the liquid dung is improved, the volatilization of the ammonia gas is reduced, for example, methods for acidifying the livestock liquid dung are disclosed in the prior art (CN109516839A), but the method for acidifying the livestock liquid dung can not be stored for a long time and can not be stored until the pH value of the common acid is reduced, and the pH value can be stably stored in the cattle liquid dung.

Disclosure of Invention

The invention aims to provide an method for fixing nutrients in cow dung, which can store ammonium ions in the dung for a long time, reduce volatilization of ammonia in the dung and fix the nutrients in the dung, thereby overcoming the defects in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

A method for retaining nutrients in cow dung solution comprises slowly adding calcium superphosphate into cow dung solution in a regulating tank, stirring, and regulating pH of cow dung solution to 6.0-6.5, wherein the calcium superphosphate is 2-15% of the mass fraction of livestock and poultry dung solution.

Wherein, the pH value can be completed by adopting a pH on-line detector, and the pH change in the process of adding the calcium superphosphate needs to be monitored in real time, so that the pH value of the liquid dung is prevented from being less than 6.0.

it also comprises storing the livestock manure water after adding calcium superphosphate in a storage pool for at least 30 days.

, the calcium superphosphate is added in an amount of 6-8 wt% of cow dung water.

, the liquid dung comprises or more of liquid dung generated by dry cleaning dung in a dairy farm or a beef farm, water-washed dung and water-soaked dung in a dairy farm house and liquid dung generated by a milking hall of a dairy farm after solid-liquid separation.

, the original pH of the cow dung water is 6.5-8.5, and the solid content is less than 5%.

, the granularity of said calcium superphosphate is less than 80 meshes, and it is slowly added into cow dung.

Specifically, the calcium superphosphate is industrial calcium superphosphate and is analytically pure.

, a float bowl type stirrer is arranged in the regulating tank.

The regulating tank and the storage tank have the functions of seepage prevention, acid corrosion prevention and pressure resistance.

Compared with the prior art, the invention has at least the following beneficial effects:

(1) after the calcium superphosphate is added, the pH value of the cow dung water in the later storage period is increased to 6.0-8.0, the ammonium nitrogen content in the dung water is increased by 82-101%, the ammonia emission flux of 43-99% in the dung water storage process can be reduced, the fertilizer efficiency of the dung water is improved, and the number of faecal coliform groups in the dung water can reach the requirements specified in the GB 18596-2001 livestock and poultry breeding industry pollutant emission standard.

(2) The method for fixing the cow dung nutrients by using the calcium superphosphate is simple and easy methods, is convenient to operate, does not need secondary addition, is agricultural fertilizers with low price, is hydrolyzed to be acidic, can reduce the pH value of the dung when being added into the dung, can also make the dung into fertilizer, and improves the fertilizer efficiency of the dung.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a graph comparing ammonium nitrogen concentration and ammonia gas emission flux in test example 1 of the present invention;

FIG. 2 is a graph comparing the ammonium nitrogen concentration and the ammonia gas emission flux in test example 2 of the present invention.

Detailed Description

The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only some embodiments of of the present invention, rather than all embodiments.

In a more typical embodiment of of the invention, the method for retaining cow dung nutrient comprises slowly adding calcium superphosphate into cow dung water in a regulating tank, continuously stirring, regulating the pH value of the cow dung water to be within 6.0-6.5, wherein the adding amount of the calcium superphosphate is 2-15% of the mass fraction of the cow dung water, and introducing the cow dung water added with the calcium superphosphate into a storage tank for storage for at least 30 days.

The cattle dung water comprises or more of liquid parts of dry manure cleaning produced in a dairy farm or a beef farm, flushing manure and water soaking manure in a livestock and poultry farm house and liquid parts of solid-liquid separation of the dung produced in a milking hall of the dairy farm, wherein the original pH of the cattle dung water is between 6.5 and 8.5, the solid content is less than 5 percent, the granularity of the calcium superphosphate is less than 80 meshes, the cattle dung water is added into the cattle dung water in a slow splashing mode, and a floating barrel type stirrer is arranged in the adjusting tank.