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Method for acidifying cow dung sewage by cucurbitaceous vegetable straws

A technology for cow dung and sewage, applied in anaerobic digestion treatment, animal husbandry wastewater treatment and other directions, can solve problems such as difficulty in purchasing, potential safety hazards, secondary salinization, etc., to reduce potential safety hazards, solve difficult treatment, fertilizer efficiency improved effect

Inactive Publication Date: 2020-03-06
INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both sulfuric acid and phosphoric acid are hazardous chemicals. Firstly, the national control is relatively strict and it is not easy to purchase. Second, there will be safety hazards in the process of transportation, storage and use, and they contain a large amount of sulfate ions. risk of salinization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for acidifying dairy cow manure sewage by using melon and vegetable stalks, comprising the following steps in sequence:

[0037] 1) select watermelon and tomato stalks (volume ratio 1:1) and mechanically press to obtain liquid and solid respectively;

[0038] 2) Anaerobic fermentation of the liquid at 38°C for 48 hours to obtain an acidulant (pH=4.0);

[0039] After the solid is dried, crush and cut off (the particle size is 2-4cm);

[0040] 3) Slowly pour 10L of the above-mentioned acidifying agent into 90L of cow manure sewage and stir, and continue stirring until the pH of the acidified cow manure sewage is 5.1;

[0041] The stock solution of the cow manure sewage is from a dairy farm after solid-liquid separation and anaerobic fermentation, with a pH of 7.2 and a solid content of 5 wt%.

[0042] 4) Evenly cover the cut-off solid in step 2) on the milk cow dung sewage after the acidification treatment in step 3), the covering thickness is 3 cm, and the sto...

Embodiment 2

[0045] A method for acidifying dairy cow manure sewage by using melon and vegetable stalks, comprising the following steps in sequence:

[0046] 1) select watermelon and tomato stalks (volume ratio 1:1) and mechanically press to obtain liquid and solid respectively;

[0047] 2) Anaerobic fermentation of the liquid at 38°C for 48 hours to obtain an acidulant (pH=4.0);

[0048] After the solid is dried, crush and cut off (the particle size is 2-4cm);

[0049] 3) Slowly pour 5L of the above-mentioned acidifying agent into 95L of cow manure sewage and stir, and continue stirring until the pH of the acidified cow manure sewage is 5.5;

[0050] The stoste of described dairy cow manure sewage is identical with embodiment 1;

[0051] 4) Evenly cover the cut-off solid in step 2) on the milk cow dung sewage after the acidification treatment in step 3), the covering thickness is 3 cm, and the storage time is 90 days.

[0052] In Example 2, the pH of milk cow manure sewage after acidif...

Embodiment 3

[0054] A method for acidifying dairy cow manure sewage by using melon and vegetable stalks, comprising the following steps in sequence:

[0055] 1) select watermelon and tomato stalks (volume ratio 1:1) and mechanically press to obtain liquid and solid respectively;

[0056] 2) Anaerobic fermentation of the liquid at 38°C for 48 hours to obtain an acidulant (pH=4.0);

[0057] After the solid is dried, crush and cut off (the particle size is 2-4cm);

[0058] 3) Slowly pour 1L of the above-mentioned acidifier into 99L of dairy cow manure sewage and stir, and continue stirring until the pH of the acidified dairy cow manure sewage is 6.2;

[0059] The stoste of described dairy cow manure sewage is identical with embodiment 1;

[0060] 4) Evenly cover the cut-off solid in step 2) on the milk cow dung sewage after the acidification treatment in step 3), the covering thickness is 3 cm, and the storage time is 90 days.

[0061] In Example 3, the pH of milk cow dung sewage after aci...

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Abstract

The invention provides a method for acidifying cow dung sewage by cucurbitaceous vegetable straws. The method specifically includes: firstly, carrying out anaerobic fermentation on liquid produced bymechanical squeezing of fresh cucurbitaceous vegetable straws to obtain an acidifying agent, then adding the acidifying agent into cow dung sewage for acidifying treatment, conducting stirring continuously until the pH value of the cow dung sewage is 5.0-6.5, then covering the cow dung sewage with the dried and cut cucurbitaceous vegetable straw solid residue uniformly, and then performing storagefor a period of time. According to the invention, after application of cucurbitaceous vegetable straws to acidifying treatment on cow dung sewage, the treated cow dung sewage has pH of less than or equal to 6.5 in the storage process, the ammonia volatilization is reduced by more than 95% or more, the nitrogen content is increased by 40% above, after direct return of the treated cow dung sewage to field for application, compared with unacidified cow dung sewage, the fertilizer efficiency is improved by 60% or above, the treated cow dung sewage replaces industrial sulfuric acid and phosphoricacid, not only reaches the purposes of acidifying cow dung sewage, increasing the nutrient content of dung sewage, but also solving the problem of difficult treatment of cucurbitaceous vegetable straws.

Description

technical field [0001] The invention relates to the technical field of animal husbandry manure treatment, in particular to a method for acidifying milk cow manure sewage with melon and vegetable stalks. Background technique [0002] The development level of the dairy farming industry is a very important symbol of the development level of animal husbandry and even the whole agriculture. In recent years, the adjustment of agricultural structure and the advancement of agricultural industrialization have led to the rapid development of large-scale dairy cow breeding, but the problem that follows is a large amount of manure generated during the production process. A preliminary survey of several large-scale dairy farming enterprises in North China found that after the solid-liquid separation of dairy cow manure in most farms, the solid manure is used as bedding material or produced as organic fertilizer, and the liquid (fecal sewage) is directly stored in the storage tank After ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F103/20
CPCC02F3/28C02F2103/20
Inventor 赵自超王艳芹姚利付龙云杨光张海兰单洪涛郭兵杨正涛
Owner INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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