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Method for biologically removing hydrogen sulfide and ammonia gas by steel sulfuric acid pickling waste liquor

A technology of hydrogen sulfide and biological oxidation, which is applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of producing a large amount of waste water, biological poisoning, increasing treatment costs and engineering costs, etc., so as to save input costs and avoid Effect of secondary pollution and energy saving

Inactive Publication Date: 2014-02-19
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the chemical treatment method is the most effective and reliable, but requires a large amount of chemical agents, and a large amount of wastewater will be generated during the treatment process, which will increase the treatment cost and engineering cost; the biological method has a wide range of applications, high efficiency, low cost, and reachable after treatment. The characteristics of harmlessness, but the multi-component malodorous gas has potential poisonous effect on organisms
[0005] Wang Aijie, Xu Xiaowen, Ren Nanqi, etc., refer to: Treatment of hydrogen sulfide and ammonia by improved biological deodorization trickling filter. Journal of Harbin Institute of Technology, 2008, 40(2): 203-206. Research on the removal of hydrogen sulfide and ammonia, the results show that higher mass concentration of hydrogen sulfide negatively affects the growth and activity of sensitive nitrifying bacteria and reduces the removal rate of ammonia
Ye Jiangyu, Shen Xiuhong, Wang Lin, etc., refer to: Research on the removal of hydrogen sulfide gas by Bio-SR process. Journal of Environmental Engineering, 2012, 6(2):584-588. , The correlation between the ventilation rate and the hydrogen sulfide removal rate was further studied. 3 , the ventilation volume is 0.08-0.12m 3 When the reactor is operated continuously and efficiently, the removal rate of hydrogen sulfide can reach more than 98.4%, but the above-mentioned process fails to eliminate the poisonous effect of odorous gas on bacteria and fails to realize the co-treatment of hydrogen sulfide and ammonia

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  • Method for biologically removing hydrogen sulfide and ammonia gas by steel sulfuric acid pickling waste liquor

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Embodiment

[0026] A method for biologically removing hydrogen sulfide and ammonia by using sulfuric acid washing waste liquid of iron and steel is carried out in the device shown in the accompanying drawing, wherein the chemical absorption tower and the biological oxidation tower are both made of plexiglass, the height of the chemical absorption tower is 1015mm, and the inner diameter 90mm, outer diameter 100mm, volume about 6.45L; biological tower height 1500mm, inner diameter 90mm, outer diameter 100mm, filled with 20-mesh polyurethane sponge, the effective volume of the packing layer is 10L. The bottom of the chemical absorption tower is equipped with an acid-resistant porous aeration device and a porous sieve plate to achieve uniform gas distribution and increase the total gas-liquid contact area. In the biological oxidation tower, the immobilized acidophilic Thiobacillus ferrooxidans attached to the polyurethane sponge is used as the main production body. The specific implementation...

Embodiment 2

[0032] A method for biologically removing hydrogen sulfide and ammonia by using iron and steel sulfuric acid washing waste liquid, the implementation steps are as follows:

[0033] 1) No nitrogen source is added to the culture solution used in the continuous operation of the biological oxidation tower, that is, only magnesium sulfate and potassium chloride are added to the nutrient salts when optimizing the sulfuric acid washing waste liquid of iron and steel. During operation, fresh culture fluid is continuously fed in, aeration is continuous, and biological oxidation fluid flows out from the lower part of the biological tower. Among them, the dilution rate of the culture solution is 0.09h -1 , the aeration rate is 150L / h. The concentration of soluble ferric iron in the obtained biological oxidation solution can reach 0.121-0.143mol / L under optimal conditions.

[0034]2) During the operation of the chemical absorption tower, use a peristaltic pump to pump the biological oxi...

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Abstract

The invention relates to a method for biologically removing hydrogen sulfide and ammonia gas by steel sulfuric acid pickling waste liquor. The method comprises the following steps: filling filler subjected to culture and biofilm hanging by acidithiobacillus ferrooxidan thiobacillus in a biological oxidation tower, and carrying out acid pickling on divalent iron in the acid pickling waste liquor divalent iron so as to oxidize the divalent iron by the acidithiobacillus ferrooxidan thiobacillus to form ferric ion; removing the ammonia gas from a biological oxidation solution in a chemical absorption tower by means of the acidic absorption effect, oxidizing hydrogen sulfite by using the soluble ferric iron, reducing the soluble ferric iron into the divalent iron, converting the hydrogen sulfite into a simple substance, and converting the ammonia gas into ammonium radicals; and regenerating a reducing solution by adding a nutrient solution and recycling the reducing solution to a biological power. The method disclosed by the invention has the advantages that a nitrogen source is provided for microorganisms in the process of removing the ammonia gas and the hydrogen sulfide, the divalent iron is regenerated while the hydrogen sulfide is removed by oxidizing the ferric iron in the acid pickling waste liquor, thus the purposes of treating the wastes with wastes and recycling the wastes are achieved, and remarkable economic benefit and environmental benefit are realized.

Description

Technical field [0001] The invention involves the resource utilization of steel sulfuric acid washing waste solution and the method of removing hydrogen sulfide and ammonia with steel sulfuric acid washing waste liquid as a biological oxidation medium. Background technique [0002] Steel sulfuric acid washing waste liquid is a common waste produced in industries such as steel metallurgy. It contains a mass score of 17%-23%sulfate and 5%-10%sulfuric acid. It has strong acidity. Direct emissions not only lead to a serious environment.Pollution, and it will cause waste of useful resources such as iron ions and waste acid in waste liquids.Therefore, the resource utilization of steel sulfuric acid washing waste fluid has become a far -reaching topic. [0003] Hydrogen sulfide is a kind of faint stinky gases with strong irritation, corrosion and toxicity. Ammonia is an alkaline corrosive gas with strong stimulation of odor.Discharge at the same time.The common existence of hydrogen sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/84B01D53/52B01D53/58
CPCY02A50/20
Inventor 秦松岩刘宗瑜薛琳吴莉莉
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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