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Method for safely utilizing livestock and poultry biogas liquid in farmland

A biogas slurry, livestock and poultry technology, applied in the field of safe utilization of livestock and poultry biogas slurry, can solve the problems of difficult separation and recovery, limited popularization and application, and high production cost, and achieve the effect of avoiding the risk of heavy metal pollution, rich resources, and green resources

Inactive Publication Date: 2015-01-28
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 biogas slurry from a pig farm 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 1125 mg / L, 540 mg / L and 63 mg / L, respectively, and the pH value was 8.4. According to Mg 2+ :PO 4 3- =1:1 molar ratio metering MgCl 2 Chemicals, mix thoroughly for 30 min. 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. According to the test (USEPA6010C-2007), the leach solution concentration of heavy metal Pb before stabilization treatment was 44.31 mg / L, and the leaching value after stabiliz...

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 6125 mg / L, 830 mg / L and 255 mg / L, respectively, and the pH value was 8.7. According to Mg 2+ :PO 4 3- =1.5:1 molar ratio metering MgCl 2 Chemicals, mix well for 45 min. 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 leach solution concentration of heavy metal Cd before stabilization treatment was 3.21 mg / L, and the leaching value after stabilization t...

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 1019 mg / L, 214.5 mg / L and 57.9 mg / 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 Chemicals, mix thoroughly for 30 min. The livestock and poultry biogas slurry after the above treatment was used in the Zn-polluted soil in 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 leach solution concentration of heavy metal Zn before stabilization treatment was 147.5 mg / L, and the leach value after stabilization treat...

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Abstract

The present invention relates to a method for safely utilizing a livestock and poultry biogas liquid in a farmland, particularly to application of the alkaline effect of plant ash to adjust the livestock and poultry biogas liquid to achieve the alkaline condition, and addition of a soluble Mg<2+> salt to promote generation of struvite crystal in the livestock and poultry biogas liquid so as to achieve recovery of nitrogen and phosphorus in the livestock and poultry biogas liquid. In the application, the livestock and poultry biogas liquid containing the struvite crystal is directly applied on the soil, and the plant ash is applied, such that the struvite crystal is promoted to be slowly dissolved to release the PO4<3-> ions so as to achieve the efficient stabilization of the heavy metal ions. With the method, the recovery of nitrogen and phosphorus in the livestock and poultry biogas liquid, and the resource utilization of the agricultural plant ash waste are achieved, the struvite crystal separation and purification steps are eliminated, the resource utilization cost of nitrogen and phosphorus in the livestock and poultry biogas liquid is substantially reduced, and the purpose of the safe application of the livestock and poultry biogas liquid in the soil is achieved.

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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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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