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A method for safe utilization of livestock and poultry biogas slurry farmland

A technology for biogas slurry and livestock and poultry is applied in the field of safe utilization of livestock and poultry biogas slurry and farmland, which can solve the problems of difficulty in separation and recovery, limited popularization and application, and high preparation cost, and achieves the effects of avoiding the risk of heavy metal pollution, abundant resources and green resources.

Inactive Publication Date: 2016-04-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the small crystal particles of struvite, it is difficult to separate and recover from sewage, and the preparation cost is generally high, which limits the popularization and application of this technology to a certain extent.
In addition, the similar patented technologies mentioned above all focus on the research on the recovery of nitrogen and phosphorus in livestock and poultry biogas slurry, but the prevention and control of the risk of heavy metal pollution in the use of farmland does not involve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Using rice straw plant ash as raw material, the plant ash and a pig farm biogas slurry were fully mixed according to the mass volume ratio of 5%, and then filtered, and the COD and NH in the filtrate were analyzed. 4 + The concentrations of -N and TP were 1125mg / L, 540mg / L and 63mg / L, respectively, and the pH value was 8.4. According to Mg 2+ :PO 4 3- =1:1 molar ratio metering MgCl 2 Chemical agents, mixed thoroughly for 30 minutes. The livestock and poultry biogas slurry after the above treatment was used in the Pb-contaminated soil at an amount of 500 kg / mu, and the concentration of Pb was 756.7 mg / kg. According to the dosage of 30 kg / mu, straw ash was evenly applied, and the soil moisture content was kept at 30%. After the curing time was 7 days, sampling and monitoring were carried out. After testing (USEPA6010C-2007), the leach solution concentration of heavy metal Pb before stabilization treatment was 44.31mg / L, and the leaching value after stabilization...

Embodiment 2

[0022] (1) Using wheat straw plant ash as raw material, the plant ash and biogas slurry from a chicken farm were fully mixed according to the mass volume ratio of 7%, and then filtered, and the COD and NH in the filtrate were analyzed. 4 + The concentrations of -N and TP were 6125mg / L, 830mg / L and 255mg / L, respectively, and the pH value was 8.7. According to Mg 2+ :PO 4 3- =1.5:1 molar ratio metering MgCl 2 Chemical agents, mixed thoroughly for 45 minutes. The livestock and poultry biogas slurry after the above treatment was used in the Cd-contaminated soil in an amount of 300 kg / mu, and the concentration of Cd was 75.2 mg / kg. Apply wheat straw plant ash evenly according to the dosage of 40 kg / mu, keep the soil moisture content at 30%, and carry out sampling and monitoring after the curing time is 10 days. According to the test (USEPA6010C-2007), the concentration of heavy metal Cd leach solution before stabilization treatment is 3.21mg / L, and the leaching value after st...

Embodiment 3

[0024] (1) Using corn stalk ash as raw material, the ash and biogas slurry from a cattle farm were fully mixed according to the mass volume ratio of 8%, and then filtered, and the COD and NH in the filtrate were analyzed. 4 + The concentrations of -N and TP were 1019mg / L, 214.5mg / L and 57.9mg / L, respectively, and the pH value was 8.5. According to Mg 2+ :PO 4 3- =1.2:1 molar ratio metering Mg(NO 3 ) 2 Chemical agents, mixed thoroughly for 30 minutes. The livestock and poultry biogas slurry after the above treatment was used in the Zn-polluted soil at an amount of 500 kg / mu, and the concentration of Zn was 1932.2 mg / kg. Apply corn stalk plant ash evenly according to the dosage of 50 kg / mu, keep the soil moisture content at 30%, and carry out sampling and monitoring after the curing time is 15 days. According to the test (USEPA6010C-2007), the concentration of heavy metal Zn leachate before stabilization treatment is 147.5mg / L, and the leach value after stabilization trea...

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Abstract

The invention relates to a method for safely utilizing livestock and poultry biogas slurry in farmland, specifically utilizing the alkalinity of plant ash to adjust livestock and poultry biogas slurry to alkaline conditions, and promoting the formation of guano in livestock and poultry biogas slurry by adding soluble Mg2+ salts Stone crystallization to realize the recovery of nitrogen and phosphorus in livestock and poultry biogas slurry. In the application, the livestock and poultry biogas slurry containing struvite crystals is directly used for land fertilization, and by applying plant ash, the struvite crystals are slowly dissolved to release PO43- ions, thereby achieving efficient stabilization of heavy metal ions. The method of the invention realizes the recovery of nitrogen and phosphorus in the biogas slurry of livestock and poultry and the resource utilization of agricultural plant ash waste, omits the struvite separation and purification step, greatly reduces the cost of resource utilization of nitrogen and phosphorus in the biogas slurry of livestock and poultry, and achieves The purpose of safe land use of biogas slurry.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and resource utilization, and in particular relates to a method for safely utilizing livestock and poultry biogas slurry in farmland. Background technique [0002] In recent years, with the rapid development of the market economy, my country's intensive and large-scale livestock and poultry breeding industry has also developed rapidly, and the large-scale livestock and poultry breeding industry is increasing at an annual rate of 3 to 5%. At present, the annual output of livestock and poultry manure in my country has exceeded 2.5 billion tons, which is 2.7 times that of industrial waste. The environmental pollution of livestock and poultry breeding has become one of the important environmental problems facing our country. Anaerobic fermentation treatment (biogas) technology has played an important role in solving the environmental pollution of large-scale livestock and poultry breeding was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C05F3/00C02F103/20
CPCC02F1/66C02F9/00C02F2101/105C02F2101/16C02F2103/20C02F2301/08C05F3/00Y02A40/20Y02E50/30Y02W30/40
Inventor 王学江赵建夫陈杰马荣生王鑫张晶黄嘉瑜颜湘波卜云杰马嵩夏四清
Owner TONGJI UNIV
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