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A process for synchronous removal of vocs, sulfides and ammonia from waste gas with chemically coupled biology and sulfur resource utilization

A sulfide and resource recovery technology, applied in the direction of sulfur compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of denitrification desulfurization technology operation efficiency decline, difficulty in ensuring high-load operation of denitrification desulfurization process, etc., to achieve no Secondary pollution, low investment and operating costs, high removal rate

Active Publication Date: 2021-09-21
ZHENGZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] A process system and method patent (CN200810064858.9) for simultaneous removal of carbon, nitrogen and sulfur in wastewater invented by Wang Aijie of Harbin Institute of Technology, which converts organic matter, sulfate and ammonia nitrogen in wastewater into carbon dioxide, elemental sulfur and nitrogen, respectively. The H produced by metabolism in the gas phase 2 S and NH 3 Converted into elemental sulfur and nitrogen, however, in an anaerobic environment, high concentrations of sulfides have certain toxic effects on microorganisms, thus leading to a decline in the overall operating efficiency of denitrification desulfurization technology; toxicity inhibition brought about by high sulfide concentrations is difficult to guarantee High load operation of denitrification desulfurization process

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  • A process for synchronous removal of vocs, sulfides and ammonia from waste gas with chemically coupled biology and sulfur resource utilization

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Embodiment 1

[0040] Sewage treatment anaerobic process, a 200 t / h papermaking wastewater with an exhaust gas flow of 2500 Nm 3 / h, VOCs content is 600 mg / Nm 3 , H 2 The S content is 20000 mg / Nm 3 , NH 3 The content is 500 mg / Nm 3 , the exhaust gas temperature is 30 o C, according to the process of the present invention, when leaving the treatment facility, the VOCs content is ≤ 80 mg / Nm 3 , H 2 S content is ≤35 mg / Nm 3 , NH 3 The content is ≤10 mg / Nm 3 ; The desulfurization efficiency is over 98%, the denitrification efficiency is over 98%, the VOCs removal efficiency is over 85%, and the recovery of elemental sulfur is 1200kg / d. The absorption tower is a spray tower with a diameter of 1.5 m, a height of 12 m, and a liquid-gas ratio of 6 L / Nm 3 In the absorption process, the desulfurization and denitrification absorption liquid is mixed with water-soluble alkalis and salts to form a buffer solution, which is mainly alkalis or salts of IA or IIA group elements, preferably sodium h...

Embodiment 2

[0042] Mixed gas from pharmaceutical workshops and anaerobic tanks with an exhaust gas flow of 4000 Nm 3 / h, H 2 The S content is 30000 mg / Nm 3 , NH 3 The content is 400 mg / Nm 3 , VOCs content is 800 mg / Nm 3 , the exhaust gas temperature is 35°C, according to the process of the present invention, when the exhaust gas leaves the absorption tower, H 2 S content is ≤50 mg / Nm 3 , NH 3 The content is ≤20 mg / Nm 3 , VOCs content is ≤80 mg / Nm 3 , the removal efficiency of VOCs is over 90%, the desulfurization efficiency is over 98%, the denitrification efficiency is over 98%, and the recovery of elemental sulfur is 2700 kg / d. The absorption tower is a packed tower with a diameter of 2.0 m, a height of 18 m, and a liquid-gas ratio of 6 L / Nm 3 The lye of the absorption liquid in the absorption process is preferably a mixture of water-soluble alkalis and salts to form a buffer solution, mainly alkalis or salts of IA or IIA group elements, preferably sodium hydroxide, calcium hyd...

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Abstract

The invention discloses a process for synchronously removing VOCs, sulfides and ammonium sulfur resources in waste gas by chemically coupled biology, belonging to the field of waste gas treatment. Firstly, the exhaust gas is passed into the absorption tower containing a slightly alkaline solution to absorb hydrogen sulfide, ammonia and some soluble VOCs, and the gas that has been released from most of the hydrogen sulfide, ammonia and part of the soluble VOCs is discharged, and the absorption liquid is passed into the micro In the oxygen bioreactor, hydrogen sulfide and ammonia are separated by sulfur oxidation, ammonia oxidation, sulfur autotrophic denitrification, and short-range denitrification coupling process (sulfur oxidizing bacteria, ammonia oxidizing bacteria, denitrifying bacteria, sulfur autotrophic denitrifying bacteria). Converted into elemental sulfur and nitrogen; then the gas enters another bioreactor to remove the remaining hydrogen sulfide, ammonia and VOCs in the gas. The process is reasonable, the removal of pollutants is not limited by the concentration, the alkaline absorption solution can be recycled, no lye is added, no carbon source is added; no secondary pollution is generated; the use of sulfur oxidation, ammonia oxidation, sulfur autotrophic denitrification, The short-range denitrification coupling process (sulfur oxidizing bacteria, ammonia oxidizing bacteria, denitrifying bacteria, sulfur autotrophic denitrifying bacteria) can reduce the electron donors required for the denitrification process and save operating costs; at the same time, the pollution can be converted into usable The recovery of elemental sulfur resources realizes the recycling of waste, and is an ideal process for simultaneously removing VOCs, sulfides and ammonia from exhaust gas.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and relates to a process for synchronously removing VOCs, sulfides and ammonia and sulfur resources from waste gas by chemical coupling biology. Background technique [0002] The problem of VOCs and odor pollution has become increasingly prominent and has become one of the main sources of PM2.5. The direct emission of exhaust gas is harmful to human health, causing serious environmental pollution and destroying the ecological balance. It is urgent to prevent and control VOCs. VOCs and odorous substances come from life and industrial production, and their components mainly include sulfur-containing compounds (sulfides, sulfides, mercaptans, etc.), (ammonia, amines, indole, etc.), oxygen-containing organic compounds (organic acids, alcohols, ketones, acids, esters, etc.), hydrocarbons (aromatic hydrocarbons, alkanes, alkenes, etc.) and halogens and their derivatives (hydrogen halides, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/84B01D53/72B01D53/58B01D53/48B01D53/75C01B17/04C01B17/02
CPCB01D53/1468B01D53/1487B01D53/48B01D53/58B01D53/72B01D53/84B01D2251/95C01B17/0232C01B17/04Y02E50/30Y02A50/20
Inventor 王晓伟张婷婷
Owner ZHENGZHOU UNIV