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Apparatus and method of bubble column three-phase bio-reactor for purifying toluene waste gas

A bioreactor, purification device technology, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, can solve the problems of bed clogging, pressure drop, complex structure and operation of biological trickling filter, rise and other problems, and achieve increased The effect of the contact area between phases, enhancing the flexibility of equipment operation, and simple equipment structure

Inactive Publication Date: 2012-08-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The exhaust gas enters the biological trickling filter from the bottom and is absorbed by the bacteria through the fixed packing layer. The liquid inorganic salt medium is sprayed from the top of the biological trickling filter to wet the packing and provide inorganic salt nutrients for the microorganisms. The structure and operation of the biological trickling filter are relatively complicated. At the same time, excessive addition of nutrients will also cause a large number of bacteria to multiply, resulting in bed blockage and pressure drop increase

Method used

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  • Apparatus and method of bubble column three-phase bio-reactor for purifying toluene waste gas
  • Apparatus and method of bubble column three-phase bio-reactor for purifying toluene waste gas
  • Apparatus and method of bubble column three-phase bio-reactor for purifying toluene waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The concentration of toluene is 100mg / m 3 , the flow rate is 0.52m 3 Toluene waste gas per hour is passed into the bubble tower three-phase bioreactor with a height-to-diameter ratio of 10:1 and a cross-sectional square side length of 0.12m. The aperture of the gas distribution plate is 0.5mm, and the amount of immobilized bacteria is three 30% of the working volume of the three-phase bioreactor, the amount of inorganic salt medium added is 70% of the working volume of the bubble column three-phase bioreactor, and the pH value of the inorganic salt medium is 7.2, where NH 4 Cl, KH 2 PO 4 , MgSO 4 ·7H 2 O, CaCl 2 , FeSO 4 ·7H 2 O concentrations were 7.5, 1.5, 0.4, 0.18, 0.07mmol / L, MnSO 4 ·H 2 O, ZnSO 4 、Na 2 MoO 4 ·7H 2 O, CuSO 4 ·5H 2 O, CoCl 2 ·6H 2 O is a trace amount, and the inorganic salt medium is configured with tap water. The temperature in the bubble column three-phase reactor is maintained at 25°C, and 0.5L of inorganic salt medium is supplem...

Embodiment 2

[0025] The concentration of toluene is 200mg / m 3 , the flow rate is 0.78m 3 The toluene waste gas per hour is passed into the bubble tower three-phase bioreactor with a height-to-diameter ratio of 11:1 and a cross-sectional square side length of 0.15m. 35% of the working volume of the bioreactor, the addition of inorganic salt medium is 65% of the working volume of the bubble column three-phase bioreactor, wherein (NH 4 ) 2 SO 4 、K 2 HPO 4 , MgCl 2 , CaCl 2 , FeCl 2 4H 2 O concentrations were 8, 3, 0.8, 0.3, 0.15mmol / L, MnSO 4 ·H 2 O, ZnCl 2 、Na 2 MoO 4 ·7H 2 O, CuCl 2 2H 2 O. CoSO 4 ·7H 2 O is a trace amount. The temperature in the bubble column three-phase reactor was maintained at 28° C., 0.6 L of inorganic salt medium was supplemented every day, and the experimental steps in Example 1 were repeated to carry out biological purification of immobilized bacteria. Detection of export toluene down to 52mg / m 3 , the removal rate reaches 74%, and the volume loa...

Embodiment 3

[0027] The concentration of toluene is 400mg / m 3 , the flow rate is 1.04m 3 Toluene waste gas per hour is passed into a bubble tower three-phase bioreactor with a height-to-diameter ratio of 12:1 and a cross-sectional square side length of 0.2m. The aperture of the gas distribution plate is 4.5mm, and the amount of immobilized bacteria added is 40% of the working volume of the three-phase bioreactor, and the amount of inorganic salt medium added is 60% of the working volume of the three-phase bioreactor of the bubble column, of which NH 4 Cl, (NH 4 ) 2 SO 4 、KH 2 PO 4 、K 2 HPO 4 , MgSO 4 ·7H 2 O, MgCl 2 , CaCl 2 , FeCl 2 4H 2 O, FeSO 4 ·7H 2 O concentrations were 16.5, 3, 3, 1.5, 0.6, 0.4, 0.5, 0.1, 0.1mmol / L, MnSO 4 ·H 2 O, ZnSO 4 、Na 2 MoO 4 ·7H 2 O, CuSO 4 ·5H 2 O, CoCl 2 ·6H 2 O is a trace amount. The temperature in the three-phase bubble column reactor was maintained at 30° C., and 0.7 L of inorganic salt medium was supplemented every day. The exp...

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Abstract

The invention relates to an apparatus and a method of bubble column three-phase bio-reactor for purifying toluene waste gas. The apparatus comprises a bubble column three-phase bio-reactor, a buffer tank, a flowmeter, an air pump, an inorganic salt medium storage tank and a peristaltic pump constant-temperature electric heater; wherein the bubble column three-phase bio-reactor is a square column shaped shell. The side length of the square of cross section of the shell is 0.12-0.2m. An air distribution plate is arranged in the central position of the bottom of the shell. A detachable pysamid shaped seal is arranged at the upper part of the shell. A water outlet is arranged at a position adjacent to the bottom surface below the shell, and the internal diameter of the water outlet is 5 timesthat of immobilized thallus; wherein height-diameter ratio of the shell is 10:1-12:1. Toluene is purified by immobilized Pseudomonas putida WQ-03. A liquid phase is the inorganic salt medium, and the bubble column three-phase bio-reactor has no internal components, thus the rising resistance of air is small, the stay period is short, and the treating effect is good. Therefore, the research of using immobilized thallus to purify toluene waste gas in the bubble column three-phase bio-reactor has important actual application value.

Description

technical field [0001] The invention relates to a bubble tower three-phase bioreactor purification device and method for toluene waste gas, belonging to the technical field of toluene waste gas biological purification. Background technique [0002] Toluene is an important chemical raw material and fuel, widely used in the preparation of oils, resins, rubber, coal tar, pitch, cellulose acetate, cellulose paint, photographic ink, benzoyl chloride, trinitrotoluene and many Dyes, etc., are used in a huge amount in industrial production. Toluene in the air mainly comes from vehicle exhaust, gasoline processing, solvent loss caused by industrial activities, and accidents during storage and transportation. Toluene is volatile, inhalation of air containing excessive toluene may cause throat tingling, itching and burning sensation, and may cause tearing, redness and congestion in the eyes; toluene directly splashed on the skin may cause local redness, tingling and herpes etc. Afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/84B01D53/72
CPCY02A50/20
Inventor 闻建平王雪贾晓强
Owner TIANJIN UNIV
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