阅读说明：本技术 一种高含硫化氢臭气的处理系统及方法 (Treatment system and method for high-hydrogen-sulfide-content odor ) 是由 邢建民 唐斌 宋太沧 穆廷桢 于 2019-10-30 设计创作，主要内容包括：本发明提供了一种高含硫化氢臭气的处理系统,采用生物洗涤塔、生物滴滤塔、化学氧化塔等串联实现高含硫化氢臭气的处理,此过程包括高浓度硫化氢被中碱性的喷淋液吸收,并被嗜碱脱硫菌氧化为单质硫；剩余的硫化氢、氨气、VOCs等被微生物转化或降解,残留的臭气组分被次氯酸钠进一步彻底氧化。本发明的有益效果在于：本方法可以耐受高浓度硫化氢的冲击,对于硫化氢浓度介于200-50000ppm的臭气,硫化氢去除率达到99%以上,除臭效率可达99%以上,同时,工艺简单,操作性强,投资、运行成本低。(The invention provides a processing system of odor with high hydrogen sulfide content, which adopts a biological washing tower, a biological trickling filter, a chemical oxidation tower and the like which are connected in series to realize the processing of the odor with high hydrogen sulfide content, and the process comprises the steps that high-concentration hydrogen sulfide is absorbed by alkalescent spray liquid and is oxidized into elemental sulfur by alkalophilic desulfurization bacteria; the remaining hydrogen sulfide, ammonia gas, VOCs, etc. are converted or degraded by microorganisms, and the remaining odor components are further thoroughly oxidized by sodium hypochlorite. The invention has the beneficial effects that: the method can resist the impact of high-concentration hydrogen sulfide, the removal rate of the hydrogen sulfide reaches more than 99 percent and the deodorization efficiency reaches more than 99 percent for the odor with the concentration of the hydrogen sulfide of 200-50000ppm, and simultaneously, the method has the advantages of simple process, strong operability, and low investment and operation cost.)

1. A processing system of high hydrogen sulfide-containing odor is characterized in that: comprises a spray desulfurization system, a biological trickling filter, a chemical oxidation spray tower and a water washing tower.

2. The method for treating high-hydrogen sulfide-content odor according to claim 1, characterized by comprising the following steps: sequentially treating the waste gas by a spray desulfurization system, a biological trickling filter, a chemical oxidation spray tower and a water washing tower, and finally discharging the waste gas at high altitude, wherein the towers are connected by a draught fan.

3. The method for treating high-hydrogen sulfide odor according to claim 2, characterized in that: the spraying desulfurization system comprises an alkali liquor spraying tower, an alkali liquor spraying tower filler, a sulfur oxidation reaction tank and a sulfur precipitation tank.

4. The method for treating high-hydrogen sulfide odor according to claim 2, characterized in that: the spray desulfurization system comprises an alkaliphilic bacterium A and an alkaliphilic bacterium B.

5. The method for treating high-hydrogen sulfide odor according to claim 2, characterized in that: the circulating liquid in the spray desulfurization system is a buffer solution of sodium carbonate and/or sodium bicarbonate, and the pH value is 9.0-10.5.

6. The method for treating high-hydrogen sulfide odor according to claim 2, characterized in that: and a chemical oxidation spray tower filler is arranged in the chemical oxidation spray tower.

7. The method for treating high-hydrogen sulfide odor according to claim 2, characterized in that: and a washing tower filler is arranged in the washing tower.

Technical Field

The invention relates to the technical field of odor treatment, in particular to a system and a method for treating odor with high hydrogen sulfide content.

Background

Due to the widespread use of sulfur-containing compounds in industry, the sulfur elements in the wastewater often enter the exhaust gas in the form of hydrogen sulfide. A large amount of hydrogen sulfide is generated in the treatment process of waste water such as pharmacy, tanning, fermentation and the like, and particularly, in order to improve the treatment efficiency of an aerobic section, a hydrolysis acidification section is often added to improve the biodegradability of the waste water. The hydrolysis acidification section can generate a large amount of hydrogen sulfide gas, and the concentration of the hydrogen sulfide can reach over 1000 ppm, even 4000-. Besides hydrogen sulfide, the waste gas also comprises ammonia gas, VOCs and other components, and the treatment difficulty is high.

People often adopt chemical methods, biological methods and the like to treat the odor of sewage plants. The chemical method mainly refers to absorption of main waste gas components by adopting acid, alkali, oxidant and the like. This process is uneconomical for off-gases containing large amounts of hydrogen sulphide, since it consumes large amounts of alkali and is difficult to recycle, resulting in high operating costs. The biological method mainly comprises a filtration method, a trickling filtration method, a leaching method and the like. Because the water solubility of various components in the waste gas is poor, such as various aromatic VOCs and the like, a filtration method is mostly adopted, and the method has mature application for obtaining good effect on removing low-concentration hydrogen sulfide, ammonia gas, VOCs and the like. If the high-efficiency packed tower is adopted to treat the sulfur-containing odor generated by the pharmaceutical wastewater treatment, when the concentration of hydrogen sulfide is less than or equal to 1700ppm, the discharged gas can reach the national discharge standard. However, when the concentration of hydrogen sulfide is increased, the removal rate is obviously reduced, and when the concentration of inlet gas reaches 8000ppm, the removal rate of outlet gas hydrogen sulfide is only 40% (environmental science, 2003, 24 (6) 74-78). When high-concentration hydrogen sulfide waste gas is treated, the absorption liquid is quickly acidified, the pH value is quickly reduced to be below 2, most microorganisms in the absorption liquid are difficult to survive, flora mainly comprising acid desulfurization bacteria is gradually formed, and the removal capability of other components is lost. If the absorption liquid replacement is continuously carried out, a large amount of high-salinity wastewater with high ammonium radical content must be formed. Therefore, the prior common process has certain problems for treating the odor containing high-concentration hydrogen sulfide.

Based on the above, there is a need to provide a treatment method suitable for odor with high hydrogen sulfide content, so that the removal rate of each component in the odor can reach more than 99%, and the odor can stably operate, which is significant.

Disclosure of Invention

In order to solve the problems, the invention discloses a system and a method for treating high-hydrogen-sulfide-content odor, which adopt a biological washing tower, a biological trickling filter, a chemical oxidation tower and the like which are connected in series to realize the treatment of the high-hydrogen-sulfide-content odor; for the odor with the concentration of the hydrogen sulfide of 200-50000ppm, the removal rate of the hydrogen sulfide reaches more than 99 percent, the deodorization efficiency reaches more than 99 percent, and the emission standard is reached.

In order to achieve the above purpose, the invention provides the following technical scheme:

a processing system of high hydrogen sulfide-containing odor comprises a spray desulfurization system, a biological trickling filter, a chemical oxidation spray tower and a water washing tower. The method for treating the odor with high hydrogen sulfide content comprises the following specific steps: the high-sulfur hydrogen sulfide odor is treated by a spray desulfurization system, a biological trickling filter, a chemical oxidation spray tower and a water washing tower in sequence, and is discharged at high altitude, wherein the towers are connected through a draught fan.

Furthermore, the spray desulfurization system comprises a spray desulfurization tower, a biological sulfur oxidation tank and an elemental sulfur precipitation tank; the odor enters the next working section after passing through the spray desulfurization tower, the absorption liquid enters the biological sulfur oxidation tank for regeneration, and the regenerated absorption liquid enters the spray absorption tower again for absorbing hydrogen sulfide; the sulfide in the biological sulfur oxidation tank is oxidized into elemental sulfur by microorganisms, and the elemental sulfur is separated in the precipitation tank.

Furthermore, the absorption liquid in the spray desulfurization system is a buffer solution prepared from sodium carbonate and sodium bicarbonate, and the Ph is 9.0-10.5.

Furthermore, the microorganisms in the spray desulfurization system consist of alkalophilic A bacteria and alkalophilic B bacteria, wherein the A bacteria oxidize sulfides into elemental sulfur, and the B bacteria metabolize and consume soluble VOCs as a carbon source.

Furthermore, the biological filter tower system comprises a biological filter tower and a nutrient solution storage tank, wherein the nutrient solution sprays the filler in the filter tower through a liquid circulating pump.

Further, the chemical oxidation spray tower is characterized in that the oxidant is an aqueous solution of sodium hypochlorite.

Further, the treatment system of the odor with high hydrogen sulfide content can omit a certain working section or a certain working sections according to the composition of the gas.

Compared with the prior art, the invention has the beneficial effects that:

1. the absorption liquid is neutral-alkaline, the Ph value is 9.0-10.5, and compared with weakly alkaline absorption liquid, the capacity of absorbing hydrogen sulfide can be greatly improved;

2. alkalophilic sulfur oxidizing bacteria are adopted in the biological oxidation process, the purity of elemental sulfur is high and reaches more than 98 percent;

3. the alkalophilic bacteria B are added into the biological oxidation tank, can coexist with the alkalophilic bacteria A in the same environment, and are metabolized into carbon dioxide and the like by taking organic carbon as a carbon source, so that the risk of bacterial contamination of the oxidation tank is effectively reduced;

4. before entering the biological filter tower, the odor does not need to be pretreated by wetting and the like, so that the process flow is simplified;

5. the odor entering the biological filter tower can carry a small amount of sodium carbonate or sodium bicarbonate, and can neutralize and relieve acidification of the biological filter tower nutrient solution;

6. the process can resist the impact of high hydrogen sulfide, and the concentration of the hydrogen sulfide in the discharged gas is lower than 20ppm, so that the odor containing amines and VOCs can be effectively treated, and the emission requirement is met. Simple process, strong operability, and low investment and operation cost.

Drawings

FIG. 1 is a process flow diagram of the process of the present invention for treating odors containing high concentrations of hydrogen sulfide.

List of reference numerals:

1-an alkali liquor spray tower, 2-an alkali liquor spray tower filler, 3-a water pump, 4-a sulfur oxidation reaction tank, 5-a sulfur precipitation tank, 6-a biological trickling filter, 7-a biological trickling filter filler, 8-a fan, 9-a nutrient solution storage tank, 10-a chemical oxidation spray tower, 11-a chemical oxidation spray tower filler, 12-a washing tower, 13-a washing tower filler, 14-an oxidant liquid storage tank and 15-a water storage tank.

Detailed Description

The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.

As shown in the figure, the treatment system for the high-hydrogen-sulfide-content odor comprises an alkali liquor spray tower 1, an alkali liquor spray tower filler 2, a water pump 3, a sulfur oxidation reaction tank 4, a sulfur precipitation tank 5, a biological trickling filter tower 6, a biological trickling filter tower filler 7, a fan 8, a nutrient solution storage tank 9, a chemical oxidation spray tower 10, a chemical oxidation spray tower filler 11, a washing tower 12, a washing tower filler 13, an oxidant liquid storage tank 14 and a water storage tank 15.

The hydrogen sulfide spray tower 1, the biological trickling filter 6, the chemical oxidation spray tower 10 and the water scrubber 12 are different in circulating liquid and different in filling; the circulating liquid in the hydrogen sulfide spray tower 1 is an alkaline salt solution, specifically an aqueous solution of sodium carbonate and sodium bicarbonate, the circulating liquid in the biological trickling filter 6 is an inorganic salt nutrient solution, specifically an aqueous solution of potassium dihydrogen phosphate, calcium chloride, ferric sulfate, magnesium sulfate and sodium chloride, the circulating liquid in the chemical oxidation spray tower 10 is an aqueous solution of sodium hypochlorite, and the circulating liquid in the water washing tower 12 is water; the fillers in the hydrogen sulfide spray tower 1, the chemical oxidation spray tower 10 and the water scrubber 12 are plastic pall rings, and the fillers in the biological trickling filter 6 are volcanic rocks or pumice.

In this embodiment, specific microorganisms are inoculated in the sulfur oxidation reaction tank 4 and the bio-trickling filter 6, specifically, the alkaliphilic bacteria a and the alkaliphilic bacteria B are inoculated in the sulfur oxidation reaction tank 4; the biological trickling filter 6 is inoculated with penicillium, thiobacillus denitrificans, bacillus and the like.

The invention relates to a method for treating odor with high hydrogen sulfide content, which comprises the following steps:

1) the odor passes through a filler layer of the hydrogen sulfide spray tower 1 from bottom to top and contacts with the alkaline circulating liquid, and more than 98 percent of hydrogen sulfide in the odor is absorbed; the alkaline circulating liquid absorbing the hydrogen sulfide enters a sulfur oxidation reaction tank 4, an aeration system is arranged in the alkaline circulating liquid, and under the condition of proper oxygen content, the sulfide is oxidized into elemental sulfur; the alkaline circulating liquid enters the hydrogen sulfide spray tower 1 again to absorb hydrogen sulfide; part of the alkaline circulating liquid enters a sulfur precipitation tank 5, and elemental sulfur is separated;

2) the odor is discharged from the top end of the hydrogen sulfide spray tower 1 and enters the biological trickling filter 6 through a fan; most of hydrogen sulfide, ammonia gas, VOCs and the like remained in the odor pass through a filler layer of the biological trickling filter 6 from bottom to top and are absorbed or adsorbed by the spray liquid and microorganisms; spraying the spraying liquid at proper time;

3) the odor is discharged from the top end of the biological trickling filtration tower 6 and enters the chemical oxidation spray tower 10 through a fan; the odor passes through a packing layer of the chemical oxidation spray tower 10 from bottom to top, the odor is in reverse contact with the spray liquid, and residual components in the odor are oxidized by sodium hypochlorite to generate substances such as carbon dioxide, water and the like;

4) the odor is discharged from the top end of the chemical oxidation spray tower 10 and enters the water washing tower 13 through a fan; the odor passes through a filler layer of the water washing tower 13 from bottom to top, the odor is in reverse contact with the spraying liquid, and a small amount of components such as sodium hypochlorite and the like in the odor are absorbed; and (4) discharging odor through a high-altitude chimney.

The following is one embodiment of the present invention:

the amount of the odor is 1 ten thousand m3/h, the concentration of the hydrogen sulfide is 8000ppm, and other main components comprise ammonia gas, benzene, toluene, xylene, ethylbenzene, styrene, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, low molecular weight fatty acid, partial halogenated compounds and the like. After the odor passes through a hydrogen sulfide spray tower 1, the concentration of the hydrogen sulfide is lower than 50 ppm. After passing through the 6 bio-trickling filter, hydrogen sulfide, ammonia gas and easily soluble VOCs are completely removed, and only a small amount of hydrophobic VOCs are remained. The odor completely reaches the exhaust emission standard after passing through the chemical oxidation spray tower and the water washing tower.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.