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Livestock farm marsh gas ammonia nitrogen recovery method

A technology for ammonia nitrogen recovery and farms, applied in separation methods, chemical instruments and methods, nitrogen fertilizers, etc., to achieve the effects of reducing pollution, improving stripping efficiency, and reducing energy waste

Pending Publication Date: 2022-05-17
湖北中新开维现代牧业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a method for recovering ammonia nitrogen from biogas liquid in farms to solve the deficiencies of existing sewage treatment schemes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Firstly, pre-treat the biogas slurry collected in the farm, first pass it into the sedimentation tank to let the internal impurities sink to the bottom, and then use the grid to remove the oil floating on the upper layer of the biogas slurry, and only use the clarified intermediate liquid ; Then pass the pretreated biogas slurry into the air flotation device, ventilate into the biogas slurry, and use tiny air bubbles to bring out the suspended impurities in the water and float on the water surface; use soft fillers and activated carbon for the biogas slurry after air flotation treatment. Filtration to fully remove the impurities, while using NaOH solution to adjust the pH of the biogas slurry, and adjust the pH value of the biogas slurry to 11 before blowing off; then mix the biogas slurry after pH adjustment and send it to the deamination tower And spray, the spray speed is 200m 3 / h, the inner wall of the deamination tower is equipped with a heat exchange pipe to heat...

Embodiment 2

[0024] Firstly, pre-treat the biogas slurry collected in the farm, first pass it into the sedimentation tank to let the internal impurities sink to the bottom, and then use the grid to remove the oil floating on the upper layer of the biogas slurry, and only use the clarified intermediate liquid ; Then pass the pretreated biogas slurry into the air flotation device, ventilate into the biogas slurry, and use the tiny air bubbles to bring the suspended impurities in the water out to float on the water surface and clean it; use soft filler for the biogas slurry after air flotation treatment And activated carbon to filter to fully remove the impurities, while using Ca(OH) 2 The solution adjusts the pH of the biogas slurry, and adjusts the pH value of the biogas slurry to 11 before blowing off; then mixes the pH-adjusted biogas slurry and sends it to the deamination tower and sprays it at a spray speed of 200m 3 / h, the inner wall of the deamination tower is equipped with a heat ex...

Embodiment 3

[0026] Firstly, pre-treat the biogas slurry collected in the farm, first pass it into the sedimentation tank to let the internal impurities sink to the bottom, and then use the grid to remove the oil floating on the upper layer of the biogas slurry, and only use the clarified intermediate liquid ; Then pass the pretreated biogas slurry into the air flotation device, ventilate into the biogas slurry, and use the tiny air bubbles to bring the suspended impurities in the water out to float on the water surface and clean it; use soft filler for the biogas slurry after air flotation treatment And activated carbon to filter to fully remove the impurities, while using Ca(OH) 2 with Na 2 CO 3 The mixed solution adjusts the pH value of the biogas slurry, and adjusts the pH value of the biogas slurry to 11 before blowing off; then mixes the pH-adjusted biogas slurry and sends it to the deamination tower for spraying, and the spraying speed is 200m3 / h, the inner wall of the deaminatio...

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Abstract

The invention relates to a livestock farm biogas liquid ammonia nitrogen recovery method, which is mainly used for carrying out environment-friendly treatment on biogas slurry containing high-concentration ammonia nitrogen substances in a livestock farm, and comprises the following steps: firstly, removing impurities in the biogas slurry through air floatation and precipitation, then adjusting the biogas slurry to be alkaline, converting the ammonia nitrogen substances in the biogas slurry into gas through a hot air stripping mode, and removing the gas; finally, the dilute acid solution is used for recycling ammonia nitrogen substances to prepare the nitrogen fertilizer, the whole process is low in technological difficulty and high in removal efficiency, and certain economic benefits can be brought when the ammonia nitrogen gas is recycled to prepare the nitrogen fertilizer.

Description

technical field [0001] The invention belongs to the technical field of biogas slurry treatment, and in particular relates to a method for recovering ammonia nitrogen from biogas slurry in a breeding farm. Background technique [0002] Ammonia nitrogen is an important pollutant that causes water eutrophication and pollutes the environment. At present, in almost all polluted waters in China, ammonia nitrogen is one of the main pollutants. Water pollution, especially water eutrophication, has become an economic The development of important influencing factors, among which the most important reason for the eutrophication of ammonia nitrogen in the water body is the substandard discharge of aquaculture wastewater. [0003] With the transformation of my country's livestock and poultry industry to a clustered and large-scale model, and the widespread adoption of water flushing manure cleaning methods, livestock and poultry breeding wastewater has the characteristics of large draina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14B01D53/78B01D53/58C05C3/00C02F101/16
CPCC02F9/00B01D53/78B01D53/58C05C3/00C02F2101/16C02F2001/007C02F1/40C02F1/24C02F1/283C02F1/66C02F1/20C02F1/02C02F3/30Y02E50/30
Inventor 诸葛文达耿浩金林肖志恒
Owner 湖北中新开维现代牧业有限公司
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