Deodorization treatment process for tail gas of phenol-cyanogen wastewater

Abstract

The invention discloses a phenol-cyanogen wastewater tail gas deodorization treatment process which comprises the following steps: firstly, intensively collecting tail gas through a system consisting of a sealing cover, a collecting pipeline and an induced draft fan aiming at normal-temperature odor containing ammonia gas, hydrogen sulfide and organic waste gas generated by structures such as an adjusting tank and a floatation tank in a phenol-cyanogen wastewater system of a coking plant; the chemical washing tower is used for removing alkaline substances and the like by using a phosphoric acid solution, the biological filter prewashing section is used for absorbing impurities and humidifying gas by using clear water, the biological section is used for degrading pollutants by using microorganisms, the activated carbon is used for adsorbing residual organic waste gas, and finally, the gas reaches the standard and is discharged through a chimney. The process can effectively reduce the concentration of each pollutant in the waste gas, improves the environment quality, provides treatment demonstration for the industry, and has remarkable environmental and economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, in particular to a deodorization treatment process for tail gas from phenol-cyanide wastewater. Background Art

[0002] In the phenol-cyanide wastewater treatment system of a coking plant, the regulating tank, flotation tank, ozone tank, anoxic tank, filter press station, and associated thickening tanks and emergency tanks continuously release large amounts of odor during operation. Professional testing and analysis revealed that the main components of the odor are ammonia, hydrogen sulfide, and organic waste gases, all at room temperature. These odors not only create a pungent odor in the surrounding environment and disrupt the ecological balance, but also pose a threat to the health and work efficiency of operators. Therefore, an efficient and systematic deodorization process is urgently needed to address these issues. Summary of the Invention

[0003] (1) Technical issues

[0004] The present invention provides a deodorization treatment process which collects the tail gas of phenol-cyanide wastewater through a closed water tank, and adopts a combined process of "acid washing + microbial treatment + activated carbon adsorption (bypass)" to remove ammonia, hydrogen sulfide and organic waste gas in the tail gas, so that the final emission gas meets the standards.

[0005] (2) Technical content

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a deodorization treatment process for phenol-cyanide wastewater tail gas, comprising the following steps:

[0007] S1. Waste Gas Collection: The waste gas generated in the regulating tank, flotation tank, anoxic tank, anaerobic tank, filter press station, concentration tank, accident tank and ozone catalytic oxidation tank in the phenol-cyanide wastewater system is sealed and collected through a sealed collection system. The sealed collection system consists of a sealing cover, collection pipes and induced draft fans.

[0008] S2. Chemical washing: The collected waste gas is drawn into the chemical washing tower by a centrifugal fan. Phosphoric acid solution is used as the spray liquid and is evenly sprayed on the packing layer through an atomizing head. The waste gas and the spray liquid come into contact in reverse order to remove alkaline components, particulate matter and soluble organic components in the waste gas. The packing is PP multi-faceted hollow balls.

[0009] S3. Pre-washing treatment: The waste gas after treatment in the chemical scrubber enters the pre-washing section of the biological filter. Clean water is used as the spray liquid and is evenly sprayed on the packing layer through the atomizing head to absorb the residual soluble impurities and acidic spray liquid. At the same time, the waste gas is humidified to convert the odorous gas components from the gas phase to the liquid phase. The packing in the pre-washing section is PP multi-faceted hollow balls;

[0010] S4, biological treatment: The waste gas after pre-washing treatment is evenly distributed into the biological section of the biological filter through the internal air distribution pipe of the biological equipment. The pollutants such as ammonia, hydrogen sulfide, methyl mercaptan and methane in the waste gas are removed by the degradation action of microorganisms. At the same time, the biological filler is sprayed and humidified regularly. The biological section is filled with special biological filler as a microbial growth carrier;

[0011] S5. Activated carbon adsorption: The waste gas after biological treatment passes through the activated carbon adsorption device under the action of a centrifugal fan to adsorb the residual organic waste gas. The activated carbon is a hydrophobic adsorbent containing a large number of micropores;

[0012] S6. Emissions that meet standards: The treated gas is discharged into the atmosphere through the chimney.

[0013] Furthermore, in the spray system of the chemical scrubber, the scrubber water pump and the fan are linked to run for 24 hours to continuously treat particulate matter, water-soluble components, oil components and alkaline components in the exhaust gas.

[0014] Furthermore, the spray system of the pre-wash section of the biofilter is linked with the fan to operate 24 hours a day to meet the washing and humidification needs of the pre-wash section.

[0015] Furthermore, the spraying system of the biological section of the biological filter is operated intermittently to maintain the moisture and environmental humidity requirements necessary for the growth of microorganisms.

[0016] (3) Technical effects

[0017] Compared with the existing technology, the present invention has the following advantages: the present invention adopts the method of water tank sealing and tail gas collection to collect the escaped odor in a centralized manner. The collected tail gas is treated by a combined process of acid washing + microbial treatment + activated carbon adsorption (bypass). Acid washing removes alkaline substances and some soluble gases in the tail gas, and microbial treatment is used to decompose organic waste gas and pollutants such as hydrogen sulfide. Activated carbon adsorption (bypass) is used as a deep purification method to further absorb residual odors and untreated pollutants, ensuring that the final discharged gas meets environmental protection standards and effectively improves the air quality in the surrounding environment of the wastewater treatment station. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a waste gas treatment process diagram of a deodorization treatment process for phenol-cyanide wastewater tail gas. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the accompanying drawings.

[0020] Combined with attachment Figure 1 A deodorization process for treating tail gas from phenol-cyanide wastewater comprises the following steps:

[0021] S1. Waste Gas Collection: The waste gas generated in the regulating tank, flotation tank, anoxic tank, anaerobic tank, filter press station, concentration tank, accident tank and ozone catalytic oxidation tank in the phenol-cyanide wastewater system is sealed and collected through a sealed collection system. The sealed collection system consists of a sealing cover, collection pipes and induced draft fans.

[0022] S2. Chemical washing: The collected waste gas is drawn into the chemical washing tower by a centrifugal fan. Phosphoric acid solution is used as the spray liquid and is evenly sprayed on the packing layer through an atomizing head. The waste gas and the spray liquid come into contact in reverse order to remove alkaline components, particulate matter and soluble organic components in the waste gas. The packing is PP multi-faceted hollow balls.

[0023] S3. Pre-washing treatment: The waste gas after treatment in the chemical scrubber enters the pre-washing section of the biological filter. Clean water is used as the spray liquid and is evenly sprayed on the packing layer through the atomizing head to absorb the residual soluble impurities and acidic spray liquid. At the same time, the waste gas is humidified to convert the odorous gas components from the gas phase to the liquid phase. The packing in the pre-washing section is PP multi-faceted hollow balls;

[0024] S4, biological treatment: The waste gas after pre-washing treatment is evenly distributed into the biological section of the biological filter through the internal air distribution pipe of the biological equipment. The pollutants such as ammonia, hydrogen sulfide, methyl mercaptan and methane in the waste gas are removed by the degradation action of microorganisms. At the same time, the biological filler is sprayed and humidified regularly. The biological section is filled with special biological filler as a microbial growth carrier;

[0025] S5. Activated carbon adsorption: The waste gas after biological treatment passes through the activated carbon adsorption device under the action of a centrifugal fan to adsorb the residual organic waste gas. The activated carbon is a hydrophobic adsorbent containing a large number of micropores;

[0026] S6. Emissions that meet standards: The treated gas is discharged into the atmosphere through the chimney.

[0027] The chemical scrubber's spray system, in conjunction with the scrubber's water pump and fan, operates 24 hours a day, continuously treating particulate matter, water-soluble components, oils, and alkaline components in the exhaust gas. The biological filter's pre-wash section's spray system, in conjunction with the fan, operates 24 hours a day to meet the pre-wash and humidification needs. The biological filter's biological section's spray system operates intermittently to maintain the moisture and humidity necessary for microbial growth.

[0028] The working process of the present invention is as follows:

[0029] 1. Waste gas collection: A sealed cover is installed above the regulating tank, flotation tank, ozone tank, anoxic tank, filter press station, concentration tank, accident tank and other structures, and connected to the induced draft fan through a collection pipe. Under the negative pressure of the induced draft fan, the escaped odor is collected and sent to the treatment system.

[0030] 2. Chemical Washing (Acid Washing): A chemical scrubber (filled with PP multi-faceted hollow balls) uses a phosphoric acid solution in the spray system. An induced draft fan delivers exhaust gas into the scrubber, where it comes into contact with the spray liquid in a countercurrent. The spray liquid is evenly sprayed through an atomizing head, removing alkaline substances (such as ammonia), particulate matter, and some soluble organic waste gases from the exhaust gas.

[0031] 3. Pre-washing: In the pre-wash section of the biofilter (filled with PP multi-faceted hollow balls), the spray system uses clean water. Exhaust gas treated by the scrubber enters the pre-wash section, where it absorbs residual acidic spray liquid and soluble impurities. It also humidifies the exhaust gas, converting gaseous pollutants into liquid phase, creating conditions for microbial treatment.

[0032] 4. Biological treatment: The biological section of the biofilter (filled with specialized biological fillers, such as volcanic rock and coconut shell activated carbon composite fillers) is humidified. Exhaust gas is evenly distributed through air distribution ducts into the biological section. Microorganisms (selected desulfurization bacteria and ammonia oxidizing bacteria, etc.) form a biofilm on the filler surface, degrading pollutants such as hydrogen sulfide, methyl mercaptan, and methane. The spray system operates intermittently to maintain filler humidity, and microbial nutrient solution is added to the spray water in the biological section.

[0033] 5. Activated carbon adsorption (bypass): Activated carbon adsorption box (filled with granular activated carbon). The waste gas after biological treatment passes through the activated carbon layer; it absorbs residual organic waste gas and odor to ensure that the final gas meets the standard.

[0034] 6. Emissions that meet standards: The treated gas is discharged in an organized manner through an 18-meter-high chimney.

[0035] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A deodorization process for phenol-cyanide wastewater tail gas, characterized in that: The following steps are involved: S1. Waste Gas Collection: The waste gas generated in the regulating tank, flotation tank, anoxic tank, anaerobic tank, filter press station, concentration tank, accident tank and ozone catalytic oxidation tank in the phenol-cyanide wastewater system is sealed and collected through a sealed collection system. The sealed collection system consists of a sealing cover, collection pipes and induced draft fans. S2. Chemical washing: The collected waste gas is drawn into the chemical washing tower by a centrifugal fan. Phosphoric acid solution is used as the spray liquid and is evenly sprayed on the packing layer through an atomizing head. The waste gas and the spray liquid come into contact in reverse order to remove alkaline components, particulate matter and soluble organic components in the waste gas. The packing is PP multi-faceted hollow balls. S3. Pre-washing treatment: The waste gas after treatment in the chemical scrubber enters the pre-washing section of the biological filter. Clean water is used as the spray liquid and is evenly sprayed on the packing layer through the atomizing head to absorb the residual soluble impurities and acidic spray liquid. At the same time, the waste gas is humidified to convert the odorous gas components from the gas phase to the liquid phase. The packing in the pre-washing section is PP multi-faceted hollow balls; S4, biological treatment: The waste gas after pre-washing treatment is evenly distributed into the biological section of the biological filter through the internal air distribution pipe of the biological equipment. The pollutants such as ammonia, hydrogen sulfide, methyl mercaptan and methane in the waste gas are removed by the degradation action of microorganisms. At the same time, the biological filler is sprayed and humidified regularly. The biological section is filled with special biological filler as a microbial growth carrier; S5. Activated carbon adsorption: The waste gas after biological treatment passes through the activated carbon adsorption device under the action of a centrifugal fan to adsorb the residual organic waste gas. The activated carbon is a hydrophobic adsorbent containing a large number of micropores; S6. Emissions that meet standards: The treated gas is discharged into the atmosphere through the chimney.

2. A phenol-cyanide wastewater tail gas deodorization treatment process according to claim 1, characterized in that: In the spray system of the chemical scrubber, the scrubber water pump and the fan are linked to run 24 hours a day to continuously treat particulate matter, water-soluble components, grease components and alkaline components in the exhaust gas.

3. A phenol-cyanide wastewater tail gas deodorization treatment process according to claim 1, characterized in that: The spray system of the pre-wash section of the biofilter is linked with the fan and operates 24 hours a day to meet the washing and humidification needs of the pre-wash section.

4. A phenol-cyanide wastewater tail gas deodorization treatment process according to claim 1, characterized in that: The spraying system of the biological section of the biological filter is operated intermittently to maintain the moisture and environmental humidity requirements necessary for the growth of microorganisms.

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