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An integrated method for the prevention and control of nitrogen loss in compost leachate

An integrated method and leachate technology, applied in organic fertilizers, climate change adaptation, etc., can solve the problems of high-molecular organic nitrogen that is difficult to quickly inorganicize, nitrogen loss, and inorganic nitrogen that is difficult to recover with high selectivity and control , to achieve high selectivity resistance control recovery, to achieve the effect of inorganic

Active Publication Date: 2020-08-07
CHINA AGRI UNIV
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  • Description
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Problems solved by technology

[0007] Aiming at the problem that nitrogen in compost leachate is difficult to control and recover, the present invention provides an integrated method for nitrogen loss control in compost leachate, using hydrothermal technology to overcome the problem that high-molecular organic nitrogen is difficult to quickly inorganicize , using the coupling technology of struvite crystallization and hydrothermal carbon adsorption to overcome the problem that inorganic nitrogen is difficult to recover with high selectivity and control

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  • An integrated method for the prevention and control of nitrogen loss in compost leachate

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Embodiment 1

[0042] After adjusting the nitrogen content in the compost leachate to 1000mg / L, introduce the hydrothermal reactor to regulate the volume of the compost leachate: the volume of the hydrothermal reactor is 1:3, the reaction pH value is 5, the temperature is 150°C, and the reaction time is 90min , add oxidant (oxygen partial pressure is 5MPa) in the hydrothermal reactor.

[0043] Control the nitrogen concentration of the treated compost leachate at 150mg / L, add phosphorus salt solution and magnesium solution (dilute with phosphoric acid or use Na 2 HPO 4 12H 2 The solution of the phosphate ion content 1mol / L of O preparation, bittern prepares the magnesium agent solution of magnesium ion content 1.5mol / L, phosphorus salt solution phosphate ion: magnesium agent solution magnesium ion: compost leachate nitrogen concentration (NH 4 -N) with a molar ratio of 1:1:1), a pH value regulator (caustic soda prepares a pH value regulator with a hydroxide content of 3mol / L), regulates a p...

Embodiment 2

[0049] After adjusting the nitrogen content in the compost leachate to 200mg / L, introduce the hydrothermal reactor to regulate the volume of the compost leachate: the volume of the hydrothermal reactor is 2:3, the reaction pH value is 6, the temperature is 180°C, and the reaction time is 30min , add oxidant (oxygen partial pressure 1.5MPa) in the hydrothermal reactor.

[0050] Control the nitrogen concentration of the treated compost leachate at 100mg / L, add phosphorus salt solution and magnesium solution (dilute with phosphoric acid or use Na 2 HPO 4 12H 2 The solution of the phosphate ion content 1mol / L of O preparation, bittern prepares the magnesium agent solution of magnesium ion content 1mol / L, phosphorus salt solution phosphate ion: magnesium agent solution magnesium ion: compost leachate nitrogen concentration (NH 4 -N) molar ratio 1:1.5:1) pH value regulating agent (caustic soda prepares the pH value regulating agent of hydroxide content 5mol / L), regulates pH value ...

Embodiment 3

[0056] After adjusting the nitrogen content in the compost leachate to 500mg / L, introduce the hydrothermal reactor to regulate the volume of the compost leachate: the volume of the hydrothermal reactor is 2:3, the reaction pH value is 4, the temperature is 120°C, and the reaction time is 60min , add oxidizing agent (ozone partial pressure 2MPa) in the hydrothermal reactor.

[0057] Control the nitrogen concentration of the treated compost leachate at 50mg / L, add phosphorus salt solution and magnesium solution (dilute with phosphoric acid or use Na 2 HPO 4 12H 2 The solution of the phosphate ion content 1mol / L of O preparation, bittern prepares the magnesium solution of magnesium ion content 2mol / L, phosphorus salt solution phosphate ion: magnesium solution magnesium ion: compost leachate nitrogen concentration (NH 4 -N) with a molar ratio of 1:2:1), a pH regulator (caustic soda prepares a pH regulator with a hydroxide content of 1mol / L), regulates the pH to 10, and introduce...

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Abstract

The invention provides an integration method of nitrogen loss resistance and control in composting percolate. The method comprises the following steps: (1) after regulating and controlling nitrogen content in the composting percolate to be 200 to 1000mg / L, carrying out hydrothermal treatment; (2) controlling the concentration of nitrogen in the composting percolate subjected to the hydrothermal treatment to be 50 to 150mg / L; adding a magnesium agent solvent, a phosphorus salt solution and a pH (Potential of Hydrogen) regulator; crystallizing by adopting a guanite crystallizing method to obtainguanite crystal mud and treated composting percolate; (3) carrying out fluidized-state adsorption reaction on the treated composting percolate by taking hydrothermal carbon as an adsorbent and collecting the adsorbed hydrothermal carbon. According to the method provided by the invention, the nitrogen in the composting percolate can be effectively resisted, controlled and recycled. By adopting a hydrothermal technology, rapid inorganic treatment on macromolecular organic-state nitrogen in the composting percolate is realized; a guanite crystallizing and hydrothermal carbon adsorption and coupling technology is adopted so that high-selectivity resistance and control, and recycling of inorganic-state nitrogen are realized and the nitrogen recycling rate is greater than 98 percent.

Description

technical field [0001] The invention relates to an integrated method for preventing and controlling nitrogen loss in compost leachate. Background technique [0002] my country is a traditional large agricultural country, and the breeding industry is developing rapidly towards scale and intensification, resulting in a large amount of livestock and poultry manure. At present, the national annual output of livestock and poultry manure is about 3.8 billion tons, the comprehensive utilization rate is less than 60%, the high-efficiency utilization rate is less than 50%, and the harmless treatment rate of livestock and poultry manure produced by large-scale breeding industry is less than 10%. According to the 2010 Bulletin of the First National Survey of Pollution Sources, the chemical oxygen demand discharged by the livestock and poultry farming industry reached 12.6826 million tons, accounting for 96% of the total emissions from agricultural sources; the discharge of total nitrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05B17/00C05F9/04
CPCC05B17/00C05F9/04Y02A40/20
Inventor 张涛李欢欢武肖莎
Owner CHINA AGRI UNIV