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Apparatus and method of airlift three-phase loop bio-reactor for purifying toluene waste gas

A bioreactor, airlift technology, applied in the field of airlift three-phase loop bioreactor purification devices, can solve the problems of rise, bed clogging pressure drop, complex structure and operation of biological trickling filter, etc. Simple structure, stable purification process, and the effect of enhancing the flexibility of equipment operation

Inactive Publication Date: 2010-05-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 airlift three-phase loop bio-reactor for purifying toluene waste gas
  • Apparatus and method of airlift three-phase loop bio-reactor for purifying toluene waste gas
  • Apparatus and method of airlift three-phase loop bio-reactor for purifying toluene waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The concentration of toluene is 200mg / m 3 , the flow rate is 0.52m 3 The toluene exhaust gas per hour is passed into the air-lift three-phase circulation bioreactor with a height-to-diameter ratio of 10:1, a cross-sectional square side length of 0.12m, a draft tube with a height-to-diameter ratio of 10:1, and a cross-sectional square side length of 0.08m. Among them, the aperture of the gas distribution plate is 0.5mm, the amount of immobilized bacteria is 30% of the working volume of the three-phase bioreactor of the bubble tower, and the amount of the inorganic salt medium is 70% of the working volume of the three-phase bioreactor of the bubble tower , the pH value of the inorganic salt medium is 7.2, and the NH in the inorganic salt medium 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, the inorg...

Embodiment 2

[0025] The concentration of toluene is 400mg / m 3 , the flow rate is 0.78m 3 The toluene waste gas per hour is passed into the air-lift three-phase circulation bioreactor with a height-to-diameter ratio of 11:1, a cross-sectional square side length of 0.15m, a draft tube with a height-to-diameter ratio of 11:1, and a cross-sectional square side length of 0.11m. Among them, the aperture of the gas distribution plate is 3mm, the amount of immobilized bacteria is 35% of the working volume of the three-phase bioreactor of the bubble tower, and the amount of the inorganic salt medium is 65% of the working volume of the three-phase bioreactor of the bubble tower. In inorganic salt medium (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, and the temperature in the airlift three-phase circulation bioreactor is maintaine...

Embodiment 3

[0027] The concentration of toluene is 800mg / m 3 , the flow rate is 1.04m 3 The waste gas of toluene / h enters the air-lift three-phase circulation bioreactor with a height-to-diameter ratio of 12:1, a cross-sectional square side length of 0.2m, a draft tube with a height-to-diameter ratio of 12:1, and a cross-sectional square side length of 0.15m. Among them, the aperture of the air distribution plate is 4.5mm, the amount of immobilized bacteria is 40% of the working volume of the three-phase bioreactor of the bubble tower, and the amount of the inorganic salt medium is 60% of the working volume of the three-phase bioreactor of the bubble tower , NH in inorganic salt medium 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, and the temp...

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Abstract

The invention relates to an apparatus and a method of an airlift three-phase loop bio-reactor for purifying toluene waste gas. The apparatus comprises an airlift three-phase loop bio-reactor, a buffer tank, a flowmeter, an air pump, an inorganic salt medium storage tank, a peristaltic pump and constant-temperature electric heater, wherein the airlift three-phase loop bio-reactor is provided with a square column shaped shell, and the cross section of the shell is a square; the shell is internally provided with a square column shaped guide cylinder and is overlapped with the axle of the guide cylinder; an air distribution plate is arranged in a central position at the bottom of the shell; aperture of the through hole on the air distribution plate is 0.5-4.5mm; and a detachable pysamid shaped seal is arranged at the upper part of the shell. Toluene waste gas is purified by immobilized Pseudomonas putida WQ-03, a liquid phase is the inorganic salt medium, and the reactor is only provided with the guide cylinder. Flow patterns of gas, liquid and solid are normalized and flow circularly. The rising resistance of air is small, and treating effect is good. Therefore, research of using immobilized thallus to purify the toluene waste gas in the bubble column three-phase bio-reactor has important actual application value.

Description

technical field [0001] The invention relates to an air-lift three-phase circulation 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 volatile, and inhalation of air containing excessive toluene may cause throat tingling, itching and burning sensation, irritate the eye mucous membranes, and cause tearing, redness, and congestion; toluene directly splashed on the skin may cause local redness, irritation Pain and herpes etc. After severe toluene poisoning, it may be excited, restless, depressed, lethargic, etc. In severe cases, collapse and coma will occur; toluene can also cause the death of fish and animals. Toluene is relatively stable in the environment, can circulate in the atmosphere and water, and can eventually be degraded by biological and microbial oxidation. Since toluene is an important chemical raw material and fuel, it is widely...

Claims

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Application Information

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IPC IPC(8): B01D53/84B01D53/72
CPCY02A50/20
Inventor 闻建平王雪贾晓强
Owner TIANJIN UNIV
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