SU1287923A1 - Method of cleaning gases from organic substances - Google Patents

Abstract

This invention relates to methods for the microbiological purification of gases. from organic substances used in the machine building, woodworking industry, paper and food industries, and allowed us to increase the degree of purification. Cleansing gases are fed to an absorber with a floating inert nozzle containing a layer of sorbent — activated carbon or foamed granules of polymeric material, including an adapted culture of microorganisms, when the sorbent is irrigated with a solution of nutrient salts necessary for the growth of microorganisms. The process is carried out in the mode of fluidization of the sorbent by the gas being cleaned. In this case, 20-50% of the purified gas is recycled, and the volume of the sorbent. use equal to 15-30% of the free volume of the absorber. When cleaning gases from phenol, formaldehyde, methanol, the culture of bacteria of the genus Pseudomonas spesias, microorganisms of the genus Pseudomonas desmolyticum, or yeast of the genus Candida guilliermonii, respectively, is used. The pH of the nutrient salt solution is maintained in the range of 4.0-7.3. The degree of purification is 91-99.8%. 5 hp ff, 1 tab. SL C

Description

112

The invention relates to methods for the microbiological purification of gases and can be used in the engineering, woodworking, pulp and paper and food industries.

The purpose of the invention is to increase the degree of purification.

Example 1. A gas containing impurities in the form of phenolic vapors with a concentration of 55-60 mg / m was supplied at a speed of 1.5-2.0 m / min to a column apparatus with a floating turbulizing inert nozzle with a working volume of 0.05 In a countercurrent, an aqueous suspension containing a culture of bacteria of the genus Pseudomonas specias was supplied. A solid-phase adsorbent was introduced into the gas-liquid interaction zone, using activated carbon particles occupying 15–17% of free volume. At the same time, the apparatus was supported by SO-SZ C and рй 4.9-5, К

Additionally, an aqueous solution of nutrient salts necessary for the growth of microorganisms in the composition was added to the culture medium, g / l: phosphoric acid 1.4 potassium chloride 0.9 magnesium sulfate 0.7J iron sulfate 0.13, zinc sulfate 0.029, manganese sulfate 0,017

At the same time, the main source of nutrition was the cleansing component - phenol.

The oxygen to the culture for assimilation activity was completely provided by the gas supplied to the purification, in addition the gas to be purified served as a pseudo-waiting agent. The gas passing through the medium was purified from the phenol content, while 20% of the waste gas from the apparatus was recycled.

The gas was analyzed with a gas analyzer. The degree of gas purification from phenol was 99.3%.

Microbiological purification of stationary formaldehyde with a concentration of 25–30 mg / m was carried out under similar conditions, but the culture of the Pseudomonas desmolyticum microorganisms was used. The degree of gas purification from formaldehyde was 98.7%.

Example 2, Microbiological

gas purification from methanol using yeast of the genus Candida guilliermondii was performed in the same sequence

five

92

O 5 0

35

0

five

50 55

32

that in example 1, but B conditions: FOR H ;, pH 4.0–4.2, the amount of the adsorbent introduced occupied 15% of the free volume, and 33% of the waste gas from the apparatus was recycled. The degree of gas purification from methanol was 99.8%,

And p and, me r 3, Microbiological gas purification was carried out in the sequence as in example 1, but under conditions: 42 ° C, pH 7.35, the amount of adsorbent introduced was 30%, and the waste gas was recirculated from The apparatus was 50%. Under these conditions of gas purification from phenol using the culture of bacteria Pseudomonas spesias, the degree of gas purification at the outlet of the apparatus was 91%.

Example 4. When cleaning gas from methanol under similar conditions, as in example 5, but under conditions: pH 5.0 using the culture of the yeast Candida guilliermondii

gas purification rate was 92.5%.

.6

Example 5. Microbiological gas purification from phenol using the culture of bacteria Pseudomonas spesias was carried out in the same way and in sequence as in Example 1, but under conditions: pH 5.1j, the adsorbent was loaded with 15% free volume, which was used as foamed granules of polymeric materials, for example, a mixed compound of polystyrene, polypoprin, polyethylene, and 35% of the waste gas from the apparatus was recycled. The degree of gas purification from phenol was 9858%.

Example 6 Microbiological gas purification from phenol was carried out in the same sequence as in Example 5, but activated carbon particles served as solid-phase adsorbents. The degree of purification of polluted gas was 99.4%.

The conditions for carrying out the cleaning methods and the results obtained are given in the table.

Claims (6)

1. A method of purifying gases from organic substances, including passing them through a layer of sorbent — active carbon containing an adapted culture of microorganisms, when the sorbent is irrigated with a HFjix solution of salts, necessary for the growth of microorganisms, in order to increase the degree of purification, they are carried out in the mode of fluidization of the sorbent by the purified j gas in the absorber with a floating inert nozzle, while 20-50% of the gas being purified is recycled, and the volume of the sorbent is used equal to 15-30% of the free volume of the absorber . fO 2. The method according to claim 1, which differs from the fact that when purifying gases from phenol, a culture of bacteria of the genus Pseudomonas apesias is used. from formaldehyde, a culture of microorganisms of the genus Pseudomonas desmolyticum is used. 4. The method according to claim 1, about tl and h and y and the fact that when cleaning gases from methanol use the yeast of the genus Candida guilliermondii. 5. Method according to paragraphs. 1-4, about tl and - chuip1iy with the fact that as a sorbent use foamed granules of polymeric material. 6. Method according to paragraphs. 1-5, about tl and - because the pH is diluted. The method according to claim 1, distinguishing- {5 thieves of nutrient salts support u and with the fact that when cleaning gases in the range of 4.0-7.3. Pseudomonas desmoly-Formalticumdehyde Candida guilliermondii, Methanol Compiled by G.Vinokurova Editor В „Danko Tehred L.Oleinik Proofreader N.Korol Order 7749/9 Circulation 678 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 . Production and printing company, Uzhgorod, st. Project, 4 from formaldehyde, a culture of microorganisms of the genus Pseudomonas desmolyticum is used. 4. The method according to claim 1, about tl and h and y and the fact that when cleaning gases from methanol use the yeast of the genus Candida guilliermondii. 5. Method according to paragraphs. 1-4, about t of l and - chuip1iy with the fact that as a sorbent use the foamed granules of polymeric material 6. Method according to paragraphs. 1-5, about t l and - due to the fact that the pH is raised 5.0 sixteen 35 4.0-4.2 15 35 5.0 30 50 98.7 99.8 92.5