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Method and device for removing and recycling nitrogen and phosphorus in biogas slurry

A biogas slurry and solution technology, applied in the field of water treatment, achieves the effects of stable treatment effect, simple and easy process, and low economic cost

Active Publication Date: 2016-04-20
SOUTHWEST UNIVERSITY
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However, there is currently no process or facility that meets the requirements

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  • Method and device for removing and recycling nitrogen and phosphorus in biogas slurry
  • Method and device for removing and recycling nitrogen and phosphorus in biogas slurry
  • Method and device for removing and recycling nitrogen and phosphorus in biogas slurry

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with specific embodiments.

[0038] 1. A method for removing and recycling nitrogen and phosphorus in biogas slurry, the technological process is as follows figure 1 shown, including the following steps:

[0039] 1) Struvite crystallization: first adjust the pH value of the biogas slurry to 9~10 with NaOH solution, and then add MgCl to the biogas slurry 2 solution, so that n(Mg 2+ ):n (orthophosphate)=1.3~1.4:1; Stir the biogas slurry at a uniform speed to generate struvite (magnesium ammonium phosphate) crystals, and the struvite crystals finally form sludge-like precipitates to obtain struvite sewage Sludge sedimentation and dephosphorization biogas slurry.

[0040] Due to the large amount of NH in the biogas slurry 4 + Nitrogen in the form of and phosphorus in the form of phosphate, so a certain amount of Mg is added to it 2+ It can be reacted such that nitrogen, phosphorus, especial...

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Abstract

The invention discloses a method and device for removing and recycling nitrogen and phosphorus in biogas slurry. The combined technology of struvite crystallizing, ammonia stripping, SBBR treating and BAF treating is adopted to treat and use the biogas slurry in a resource mode, nitrogen and phosphorus in the biogas slurry are converted into struvite and ammonium sulfate capable of being used as fertilizer, while it is ensured that the treated biogas slurry reaches the emission standard of livestock and poultry industry pollutants, nitrogen and phosphorus recycling is achieved, operation cost of traditional biogas slurry treatment is effectively reduced, and the method has the advantages of being stable in treatment effect and the like. The device is designed based on the method, all parts of the device are optimized and improved, and the device can continuously and stably operate and is convenient to use and popularize.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method and a device for removing and recycling nitrogen and phosphorus in biogas slurry. Background technique [0002] In recent years, with the large-scale development of the livestock and poultry breeding industry and the increase in the demand for renewable energy in rural areas, the construction of large-scale biogas projects has developed rapidly. According to reports, the number of large-scale biogas projects in my country has exceeded 10,000, with a total pool capacity of more than 5 million m 3 . With the development of large and medium-sized biogas projects, a large amount of biogas slurry must be produced. If it is not properly treated, it will cause huge pressure on the environment. [0003] At present, the main method of biogas slurry disposal in my country is to return biogas slurry to the field. However, due to the large differences in soil, ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01B25/45C01C1/242
CPCC01B25/451C01C1/24C02F1/20C02F1/5254C02F1/66C02F3/30C02F9/00
Inventor 陈玉成黄磊杨志敏肖广全管宏友陈庆华
Owner SOUTHWEST UNIVERSITY
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