Cycle closed type filler-free high-efficiency ammonia nitrogen removing and nutrient recovery device of biogas slurry

A recovery method and technology without filler, which is applied in the field of environmental protection and sewage treatment to achieve the effect of increasing the pH value, facilitating the removal of ammonia nitrogen and COD, and saving electricity costs

Inactive Publication Date: 2013-09-04
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In response to the above problems, the purpose of the present invention is to provide a closed-loop, filler-free, high-efficiency biogas slurry ammonia nitrogen removal a...

Method used

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  • Cycle closed type filler-free high-efficiency ammonia nitrogen removing and nutrient recovery device of biogas slurry

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Embodiment Construction

[0045] The method of the present invention will be further described in detail below in conjunction with accompanying drawing 1 and embodiments.

[0046] (1) When starting up, pump the biogas slurry to be treated into the stripping tower 1 through the biogas slurry reflux pump 35; fill the Ca(OH)2 solution into the alkali absorption tank 21, and fill 30 into the primary acid absorption tank 22 %H 2 SO 4 solution, to 98% concentrated sulfuric acid in the secondary acid absorption tank 23.

[0047] (2) Open the relevant valve, connect and form a gas circulation circuit, start the air pump, and the air flow rate is: 5L / min. The gas flows according to the following circulation path: degassing tower 1 headspace gas → suction port 14, valves and pipes → alkali absorption tank 21 inlet 2A → liquid in the alkali absorption tank 21 → alkali absorption tank 21 gas outlet 2B, valves and pipes →Inlet 2C of primary acid absorption tank 22→Liquid in primary acid absorption tank 22→Gas ou...

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Abstract

The invention discloses a cycle closed type filler-free high-efficiency ammonia nitrogen removing and nutrient recovery device of biogas slurry, comprising the following steps: connecting an air striping tower and an absorption device through an air pump, a valve and a pipeline to form a gas circulation loop, inflating the bottom of the air stripping tower by the air pump so as to realize air stripping of a dissolved gas and ammonia nitrogen in a biogas slurry, filtering acidic gases (such as CO2 and H2S, etc.) in a recycle gas by an alkali absorption pot when the recycle gas passes through the absorption device, absorbing ammonia gas (NH3) by a primary acid absorption pot, absorbing steam in a tail gas by a secondary acid absorption pot, and sending the recycle gas by the air pump into the biogas slurry in the air stripping tower so as to continuously repeat the air stripping process. The method provided by the invention has advantages of simple processing technology, stable and reliable stripping performance, easy operation management and maintenance and the like, and is suitable for up-to-standard discharge processing of various raw materials of biogas slurries.

Description

technical field [0001] The invention relates to a method for ammonia nitrogen removal and nutrient recovery after biogas slurry post-treatment in a biogas project, and more specifically, the invention relates to a closed-loop, filler-free, high-efficiency biogas slurry ammonia nitrogen removal and nutrient recovery method. The invention belongs to the technical fields of sewage treatment and environmental protection. Background technique [0002] The use of anaerobic fermentation biogas technology to treat livestock and poultry waste, crop straw, domestic waste and other organic waste can not only control environmental pollution, but also realize the resource utilization of waste, and achieve better energy, environmental protection and economic benefits. Benefits are widely used in engineering. The remaining product after anaerobic fermentation—anaerobic digestate, also known as biogas slurry, contains various substances such as undigested organic matter, ammonia nitrogen, ...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 董仁杰庞昌乐刘良
Owner CHINA AGRI UNIV
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