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A method for treating ammonia-containing waste gas

A technology for waste gas treatment and treatment methods, applied in separation methods, chemical instruments and methods, air quality improvement, etc.

Active Publication Date: 2021-06-11
DALIAN OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, with the improvement of total nitrogen control requirements, only using nitrifying bacteria to convert ammonia into nitrate in the biological trickling filter and then discharge cannot meet the requirements.

Method used

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  • A method for treating ammonia-containing waste gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] figure 1 The flowchart of the method for treating ammonia-containing waste gas provided by the present invention specifically includes the following steps:

[0048] The biotrickling filter (using polyurethane foam as the carrier) was treated with membrane-hanging with the pig wastewater as the inoculum, in which the NH in the pig wastewater was regulated 4 + -N concentration is 600mg·L -1 , the circulating flow rate is 5L·d -1 , measure NH after 24h 4+ -N concentration is 120mg·L -1 (NH 4 + -N conversion efficiency is 80%), replace new pig raising waste water; After running like this for 20 days, NO in the effluent 2 - -N and NO 3 - The molar ratio of -N is 4:1, and a thin layer of biofilm appears on the surface of the polyurethane foam. The flora on the biofilm is analyzed, and the results show that the dominant bacterial species is Nitrosomonas sp. , at this time, the film formation ends, and a film formation biotrickling filter is obtained.

[0049] Prepa...

Embodiment 2

[0053] The biotrickling filter (using polyurethane foam as the carrier) was treated with membrane-hanging with the pig wastewater as the inoculum, in which the NH in the pig wastewater was regulated 4 + -N concentration is 1200mg·L -1 , the circulating flow rate is 5L·d -1 , measure NH after 72h 4 + -N concentration is 220mg·L -1 (NH 4 + -N conversion efficiency is 82%), replace new pig raising waste water; After running like this for 20 days, NO in the effluent 2 - -N and NO 3 - The molar ratio of -N is 4:1, and a thin layer of biofilm appears on the surface of the polyurethane foam. The flora on the biofilm is analyzed, and the results show that the dominant bacterial species is Nitrosomonas sp. , at this time, the film formation ends, and a film formation biotrickling filter is obtained.

[0054] Prepare eluent, the content of each component in the eluent is as follows: MgSO 4 0.25g / L, CaCl 2 0.025g / L, KH 2 PO 4 2.0g / L, NaHCO 3 1.25g / L, FeSO 4 5×10 -3...

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Abstract

The invention relates to the technical field of waste gas treatment, in particular to a method for treating ammonia-containing waste gas. The invention adopts the biological trickling filter conversion method to realize the removal of ammonia in the ammonia-containing waste gas, specifically, by controlling the composition of the eluent, the process parameters of the biological trickling filter and the operating parameters of the ammonia gas removal treatment, the ammonia-containing waste gas is dissolved In the eluent, ammonia gas is converted into ammonium ions; through biological oxidation, part of the ammonium ions in the eluent are oxidized by ammonia-oxidizing bacteria into nitrite, ensuring that NO in the eluent effluent 2 ‑ ‑N and NO 3 ‑ ‑N molar ratio ≥ 4:1, NH 4 + ‑N and NO 2 ‑ The molar ratio of ‑N is 1: (0.7~1.3); Then use the anammox sludge as the inoculum to purify the eluent effluent, so that NH 4 + ‑N and NO 2 ‑ ‑N is converted into nitrogen, and the resulting purified eluate is returned to the biological trickling filter to re-wash the ammonia-containing waste gas to achieve "zero nitrogen" emissions.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a method for treating ammonia-containing waste gas. Background technique [0002] Ammonia is a colorless, highly reactive, corrosive, and unpleasant-smelling gas that mainly comes from industries such as fertilizer production, livestock and poultry breeding, fossil fuel combustion, and sewage treatment. The emission of ammonia gas will not only cause harm to human health, but also cause environmental problems such as the increase of atmospheric PM2.5 particles and eutrophication of water bodies. Therefore, governments of various countries have set strict emission standards for ammonia gas. [0003] The treatment of ammonia-containing waste gas generally adopts thermal oxidation method, catalytic combustion method, adsorption method, chemical washing method or biological trickling filter conversion method, among which the biological trickling filter conversion method i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/84B01D53/58
CPCB01D53/58B01D53/84Y02A50/20
Inventor 张蕾陈晓波李振亚王钇琦
Owner DALIAN OCEAN UNIV