A biological treatment method for combustible gas deoxidation and denitrification

A biological treatment and gas technology, applied in the direction of gas fuel, fuel, waste fuel, etc., can solve the problem of high energy consumption, and achieve the effect of low energy consumption, high energy efficiency, and low equipment and control requirements

Active Publication Date: 2019-08-09
CHENGDU ZHONGKE ENERGY & ENVIRONMENTAL PROTECTION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent "Deoxygenation and denitrification system for oxygen-containing coalbed methane" (public patent CN 103484184 A) discloses a method for deoxygenation and denitrification by cryogenic separation, but this method consumes a lot of energy

Method used

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  • A biological treatment method for combustible gas deoxidation and denitrification

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Embodiment 1

[0023] Deoxidize and denitrify the landfill gas of a waste landfill site, the collection volume of landfill gas is 10000m 3 / d, the main component of landfill gas is CH 4 50%, CO 2 40%, O 2 2%, N 2 6%. Collect landfill gas and nearby domestic sewage, pass them and the aerobic activated sludge from the sewage treatment plant into the closed deoxygenation membrane bioreactor, control the temperature in the reactor to 20 ℃, pH value 6.5 for aerobic respiration and metabolism, aerobic The aerobic heterotrophic bacteria in activated sludge pass the reaction formula (organic matter+O 2 →CO 2 +H 2 O) consume O 2 ; Prepare a nitrogen-free medium, the formula is 5g of glucose per liter of water, KH 2 PO 4 0.2g, MgSO4 7H 2 O 0.2g, NaCl 0.2g, FeSO4 0.05g, CaCl 2 2H 2 O 0.2g, NaMoO 4 0.01g, CaCO3 3g, L-ascorbic acid 0.2g, nitrogen-free medium, landfill gas after deoxygenation, and Clostridium acetobutylicum (Clostridium acetobutylicum) are passed into the two-stage closed den...

Embodiment 2

[0025] Deoxidation and denitrification treatment of coalbed methane in a small coal mine, the collection volume of coalbed methane is 20000m 3 / d, O in coalbed methane 2 5%, N 2 15%, the rest mainly CH 4 . Collect coalbed methane and nearby starch production wastewater, pass them and the aerobic activated sludge from the sewage treatment plant into a two-stage closed deoxygenation bubbling bioreactor, control the temperature in the reactor at 28°C, and pH 7.5 for aerobic respiration and metabolism , the aerobic heterotrophic bacteria in the aerobic activated sludge pass the reaction formula (organic matter+O 2 →CO 2 +H 2 O) consume O 2 ; Prepare a nitrogen-free medium, the formula is 13g of glucose per liter of water, KH 2 PO 4 1.5g, MgSO4 7H 2 O 0.35g, NaCl 0.6g, FeSO4 0.07g, CaCl 2 2H 2 O 0.35g, NaMoO 4 0.02g, CaCO 3 4g, L-ascorbic acid 0.3g, nitrogen-free medium, deoxygenated coalbed methane, Clostridium formicoaceticum, Clostridium akagii, Clostridium acidisol...

Embodiment 3

[0027] Deoxidation and denitrification of coke oven gas in a coking plant, the coke oven gas collection volume is 20000m 3 / d, gas composition H 2 55%, CH 4 20%, CO 9%, CO 2 5%, N 2 5%, O 2 0.8%. Collect coke oven gas and wastewater from nearby alcohol production, pass them and the aerobic activated sludge from the sewage treatment plant into a closed deoxygenated stirred bioreactor, control the temperature in the reactor to 35°C, and the pH value to 8.5 for aerobic respiration and metabolism. The aerobic heterotrophic bacteria in oxygen-activated sludge pass the reaction formula (organic matter+O 2 →CO 2 +H 2 O) consume O 2 ; Prepare a nitrogen-free medium, the formula is 20g of glucose per liter of water, KH 2 PO 4 3g, MgSO4 7H 2 O 0.5g, NaCl 1g, FeSO4 0.1g, CaCl 2 2H 2 O 0.5g, NaMoO 4 0.03g, CaCO 3 5g, L-ascorbic acid 0.4g, nitrogen-free medium, deoxygenated coke oven gas, and Thermoanaerobacteriumthermosaccharolyticum were passed into a two-stage closed deni...

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Abstract

The invention relates to a biological treatment method for combustible gas deoxidation and denitrification, comprising the following steps: (1) passing organic waste water, oxygen / nitrogen-containing combustible gas, and aerobic activated sludge into a closed deoxygenation bioreactor for aerobic Biological reaction deoxygenation; (2) Pass nitrogen-free medium, nitrogen-containing combustible gas after deoxygenation, and autogenous anaerobic heterotrophic nitrogen-fixing bacteria into a closed denitrification bioreactor to perform anaerobic biological reaction denitrification. Compared with the existing high-temperature and high-pressure chemical catalytic deoxidation and ultra-low temperature cryogenic deoxygenation and denitrification, the present invention uses the relevant metabolic functions of microorganisms to realize the deoxygenation and denitrification of combustible gases. It operates under normal temperature and pressure conditions, and has lower requirements for equipment and control. The operation stability is high, and the overall process safety is high; the deoxygenation process does not need to consume methane, carbon monoxide, hydrogen, coke, methanol and other energy substances; the denitrification process is carried out under normal pressure, without multi-stage compression refrigeration, and the energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of gas deoxygenation and denitrification, and in particular relates to a biological treatment method for deoxidation and denitrification of combustible gas. Background technique [0002] The development and utilization of combustible unconventional natural gas or waste gas such as coalbed methane, shale gas, coke oven gas, biomass gas, and landfill gas has attracted increasing attention from the international community. The above combustible gases are usually mixed with different amounts of oxygen and nitrogen. The existence of oxygen will cause greater safety hazards during the transportation, separation and utilization of combustible gases; while the presence of nitrogen will reduce the calorific value of combustible gases and affect the economic benefits of terminal utilization. In order to use the above combustible gases safely and at a high value, deoxidation and denitrification are necessary steps, es...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C10L3/10
CPCC10L3/101C10L3/105Y02E50/30
Inventor黄亚军李东文昊深叶长英
OwnerCHENGDU ZHONGKE ENERGY & ENVIRONMENTAL PROTECTION CO LTD