A method for microbial treatment of phosphine tail gas

Abstract

The invention discloses a method for microbiological treatment of hydrogen phosphide tail gas. The method particularly includes following steps: feeding the hydrogen phosphide tail gas into a trickling filtration tower of treatment equipment, wherein temperature in the trickling filtration tower is 15-35 DEG C; spraying absorbing liquid according to a liquid-gas ratio of 8-15L / m3; enabling the hydrogen phosphide tail gas to contact with the absorbing liquid and filler adhered with microorganisms; when pH value of the absorbing liquid is lowered to 5.5, abandoning part of the absorbing liquid, and supplementing fresh absorbing liquid in equal volume to continue subsequent continuous purifying treatment. The method is simple in process and low in operation cost and has good synergistic degrading effect on other impurity components like hydrogen sulfide in the tail gas. The method is suitable for purifying treatment of tail gas containing hydrogen phosphide generated by refuse landfill, grain / tobacco fumigation disinfection and yellow phosphorus production, and has obvious purifying effect when concentration of hydrogen phosphide in the tail gas is not higher than 450mg / m3.

Description

technical field

[0001] The invention relates to a method for treating phosphine tail gas by microorganisms, and belongs to the technical field of waste gas purification. Background technique

[0002] Phosphine (PH 3 ) is a highly toxic gas with a foul smell. In addition to atmospheric circulation, water bodies, sediments and other natural sources, food / tobacco fumigation and insecticide, microelectronics industry, yellow phosphorus production and other processes will produce phosphine tail gas. PH in the air 3 When the content reaches 0.0l mg / L, it will poison people; 3 At a concentration of 0.05mg / L, exposure for 0.5~1h will cause death. In order to effectively prevent the environmental pollution of phosphine, it is imperative to effectively purify the phosphine tail gas.

[0003] At present, there have been many studies on the purification treatment of high-concentration phosphine tail gas (500-1200mg / L) at home and abroad, and the existing purification technologies ca...

Examples

Embodiment 1

[0020] The method for microbial treatment of phosphine tail gas described in this embodiment, the processing equipment includes a cylindrical trickling filter tower 1, a packing layer 2, an intake pump 3, an aerator 4, a circulation tank 5, a circulation pump 6, a sprayer 7, The waste liquid discharge pipe 8, the liquid inlet pipe 9, the packing layer 2, the aerator 4, the circulation tank 5, and the sprayer 7 are arranged inside the trickling filter tower 1, and the sprayer 7 is arranged above the packing layer 2, and the packing layer 2 There are two layers, and a porous plate is set between the two layers, which can effectively support the filler and prevent the filler from being too dense, which is conducive to the uniform penetration of the gas-liquid two-phase. Below the device 4, the aerator 4 is connected to the intake pump 3, the circulation tank 5 is connected to the circulation pump 6, the circulation pump 6 is connected to the sprayer 7, the sprayer 7 has two nozzle...

Embodiment 2

[0023] The method for microbial treatment of phosphine tail gas described in this example adopts the same treatment equipment and process flow as in Example 1, after fully soaking ceramsite, polyurethane foam sponge and bagasse in water, the ceramsite is 60% by volume, Polyurethane foam sponge 20% and bagasse 20% form a composite filler; the absorption liquid is sodium acetate 20.0g / L, (NH 4 ) 2 SO 4 0.5g / L, MgSO 4 0.06g / L, KCl 0.3g / L, FeSO 4 0.06g / L, MnSO 4 The 0.06g / L mixed solution was diluted 20 times with Na 2 CO 3Adjust the pH value to the solution of 7.5, and the microbial domestication mode is the same as that of Example 1. During the treatment process, the intake flow rate of the tail gas containing phosphine is 15L / min, and the pH in the intake air is 15L / min. 3 The concentration is 300mg / m 3 , the oxygen volume fraction is 8%, and the liquid-gas ratio is 10L / m 3 Make sure that the spraying amount of circulating liquid is 9.0L / h, and the internal temperat...

Embodiment 3

[0025] The method for microbial treatment of phosphine tail gas described in this example adopts the same treatment equipment and process flow as in Example 1, after fully soaking ceramsite, polyurethane foam sponge and bagasse in water, the ceramsite is 60% by volume, Polyurethane foam sponge 24% and bagasse 16% form a composite filler; the absorption liquid is sodium acetate 20.0g / L, (NH 4 ) 2 SO 4 0.5g / L, MgSO 4 0.06g / L, KCl 0.3g / L, FeSO 4 0.06g / L, MnSO 4 The 0.06g / L mixed solution was diluted 20 times with Na 2 CO 3 Adjust the pH value to the solution of 7.4, and the microbial domestication mode is the same as that of Example 1. During the treatment process, the intake flow rate of the tail gas containing phosphine is 12L / min, and the pH in the intake air is 12L / min. 3 The concentration is 450mg / m 3 , the volume fraction of oxygen is 12%, and the liquid-gas ratio is 15L / m 3 Make sure that the spraying amount of circulating liquid is 10.8L / h, and the internal te...

technical field

[0001] The invention relates to a method for treating phosphine tail gas by microorganisms, and belongs to the technical field of waste gas purification. Background technique

[0002] Phosphine (PH 3 ) is a highly toxic gas with a foul smell. In addition to atmospheric circulation, water bodies, sediments and other natural sources, food / tobacco fumigation and insecticide, microelectronics industry, yellow phosphorus production and other processes will produce phosphine tail gas. PH in the air 3 When the content reaches 0.0l mg / L, it will poison people; 3 At a concentration of 0.05mg / L, exposure for 0.5~1h will cause death. In order to effectively prevent the environmental pollution of phosphine, it is imperative to effectively purify the phosphine tail gas.

[0003] At present, there have been many studies on the purification treatment of high-concentration phosphine tail gas (500-1200mg / L) at home and abroad, and the existing purification technologies ca...

Examples

Embodiment 1

[0020] The method for microbial treatment of phosphine tail gas described in this embodiment, the processing equipment includes a cylindrical trickling filter tower 1, a packing layer 2, an intake pump 3, an aerator 4, a circulation tank 5, a circulation pump 6, a sprayer 7, The waste liquid discharge pipe 8, the liquid inlet pipe 9, the packing layer 2, the aerator 4, the circulation tank 5, and the sprayer 7 are arranged inside the trickling filter tower 1, and the sprayer 7 is arranged above the packing layer 2, and the packing layer 2 There are two layers, and a porous plate is set between the two layers, which can effectively support the filler and prevent the filler from being too dense, which is conducive to the uniform penetration of the gas-liquid two-phase. Below the device 4, the aerator 4 is connected to the intake pump 3, the circulation tank 5 is connected to the circulation pump 6, the circulation pump 6 is connected to the sprayer 7, the sprayer 7 has two nozzle...

Embodiment 2

[0023] The method for microbial treatment of phosphine tail gas described in this example adopts the same treatment equipment and process flow as in Example 1, after fully soaking ceramsite, polyurethane foam sponge and bagasse in water, the ceramsite is 60% by volume, Polyurethane foam sponge 20% and bagasse 20% form a composite filler; the absorption liquid is sodium acetate 20.0g / L, (NH 4 ) 2 SO 4 0.5g / L, MgSO 4 0.06g / L, KCl 0.3g / L, FeSO 4 0.06g / L, MnSO 4 The 0.06g / L mixed solution was diluted 20 times with Na 2 CO 3Adjust the pH value to the solution of 7.5, and the microbial domestication mode is the same as that of Example 1. During the treatment process, the intake flow rate of the tail gas containing phosphine is 15L / min, and the pH in the intake air is 15L / min. 3 The concentration is 300mg / m 3 , the oxygen volume fraction is 8%, and the liquid-gas ratio is 10L / m 3 Make sure that the spraying amount of circulating liquid is 9.0L / h, and the internal temperat...

Embodiment 3

[0025] The method for microbial treatment of phosphine tail gas described in this example adopts the same treatment equipment and process flow as in Example 1, after fully soaking ceramsite, polyurethane foam sponge and bagasse in water, the ceramsite is 60% by volume, Polyurethane foam sponge 24% and bagasse 16% form a composite filler; the absorption liquid is sodium acetate 20.0g / L, (NH 4 ) 2 SO 4 0.5g / L, MgSO 4 0.06g / L, KCl 0.3g / L, FeSO 4 0.06g / L, MnSO 4 The 0.06g / L mixed solution was diluted 20 times with Na 2 CO 3 Adjust the pH value to the solution of 7.4, and the microbial domestication mode is the same as that of Example 1. During the treatment process, the intake flow rate of the tail gas containing phosphine is 12L / min, and the pH in the intake air is 12L / min. 3 The concentration is 450mg / m 3 , the volume fraction of oxygen is 12%, and the liquid-gas ratio is 15L / m 3 Make sure that the spraying amount of circulating liquid is 10.8L / h, and the internal te...

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