Biological desulphurization processing reactor, biological desulphurization processing system, and processing method

A biological desulfurization and reactor technology, applied in the field of environmental engineering, can solve the problems of increasing the difficulty of separation and purification of elemental sulfur, short solid residence time, and blockage of elemental sulfur, and achieves extended solid residence time, low operation and maintenance costs, and avoidance of blockage. Effect

Active Publication Date: 2012-05-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, biological desulfurization equipment and processes cannot meet the above two requirements at the same time
Traditional air-lift reactors are designed for aerobic processes. In order to obtain higher dissolved oxygen and oxygen mass transfer rates, high aeration rates are often used. The reactor structure mostly uses a single air guide cylinder or multi-layer air distributor. This structure is used in Low circulation efficiency under low ventilation and oxygen-limited conditions
In addition, more importantly, since there is no effective solid-gas-liquid three-phase separator, the solid residence time is short and the loss of immobilized carrier is serious
[0008] In addition, the biological filter bed is the main equipment for biological desulfurization. The fixed packing causes the generated elemental sulfur to stay in the reactor, which not only increases the difficulty of elemental sulfur separation and purification, but also has the problem of elemental sulfur clogging. The equipment cannot be operated for a long time and the processing capacity is limited. , cannot meet the needs of large-scale biological desulfurization of natural gas or biogas

Method used

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  • Biological desulphurization processing reactor, biological desulphurization processing system, and processing method
  • Biological desulphurization processing reactor, biological desulphurization processing system, and processing method
  • Biological desulphurization processing reactor, biological desulphurization processing system, and processing method

Examples

Experimental program
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Effect test

Embodiment 1

[0079] Example 1: Simulation of sulfide-containing wastewater

[0080] 1) Immobilized Thiobacillus, with Na 2 S 2 o 3 5~10g / L, KNO 3 5~10g / L, NaHCO 3 2g / L, KH 2 PO 4 0.1g / L culture medium at 30°C for 14 days, mix the bacterial solution with the immobilized carrier, continue to culture in the above method for 10-14 days, replace the medium every 3-4 days;

[0081] 2) The reactor is started, and the activated immobilized Thiobacillus is placed in the reactor, and the initial load of the reactor is controlled at 1~3kgS / (m 3 d), the load is increased by 2kgS / (m every 3 days 3 d).

[0082] 3) Inlet water temperature is 30-35°C, and the oxidation-reduction potential value (redox potential) is controlled at -150--100mV. When the redox potential value is lower than the set value, increase the ventilation and reduce the water intake; When the potential value is higher than the set value, the water intake will be increased and the air flow will be reduced.

[0083] Below are t...

Embodiment 2

[0090] Embodiment 2: the absorbing liquid that gas removes hydrogen sulfide

[0091] Simulated hydrogen sulfide-containing gas (v / v): 4% H 2 S, 96%N 2

[0092] 1) With pH10~11, 0.1M NaHCO 3 / Na 2 CO 3 It is the absorption liquid, after being absorbed by the packed gas-liquid exchange tower, the concentration of sulfide is 100mmolS / L absorption liquid, the pH is 7.5-8.0, and the sulfide content is 60-100mmol. The absorption liquid is pumped to the mixer and enters the reaction device.

[0093] 2) According to the concentration of sulfide in the influent, adjust the hydraulic retention time of the reactor to keep the load of the biological desulfurization device at 12kgS / (m 3 d) or so, the sulfide removal rate of the treated absorption liquid is >98%, the elemental sulfur generation rate is >80%, the pH value of the treated absorption liquid rises to 10, and can be used again for the absorption and purification of hydrogen sulfide gas.

[0094] The sulfide-containing wast...

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PUM

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Abstract

The invention provides a biological desulphurization processing reactor, a biological desulphurization processing system, and a processing method. The reactor comprises a three phase separator and a reaction zone. The reaction zone comprises an outer cylinder, a gas guiding cylinder and a lower flow guiding cylinder, such that the reaction zone is separated into an air-lift zone, an anoxic zone, and a descent zone. The three phase separator comprises an outer frustum, an inner inverted frustum, an outer sedimentation tank, an inner sedimentation tank, and an overflow groove, such that the three phase separator is separated into three sedimentation zones. Sulfide-containing wastewater is mixed with oxygen-containing water from the air-lift zone in the anoxic zone; under the effect of immobilized microorganisms, the sulfide is partially oxidized into elementary sulfur; the mixture is delivered through the three phase separator arranged above, such that the immobilized carrier is separated from a water phase and a gas phase, and sulfur particles flow out with water. According to the invention, with the structure of the reactor and the processing method, a good fluidized state is maintained, and the loss of the immobilized carrier is inhibited. The reactor, the system and the method are advantaged in high elementary sulfur production rate, good processing capacity, hydraulic load impact resistance, substrate load impact resistance, simple structure, and easy amplification.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and relates to equipment and technology for biological desulfurization treatment of sulfide-containing liquids, in particular to a biological desulfurization treatment for sulfide-containing wastewater or tail gas of chemical plants and natural gas dehydrogen sulfide absorption liquid A reactor, a biological desulfurization treatment system and a treatment method. Background technique [0002] Hydrogen sulfide is a foul-smelling, highly toxic and highly corrosive acidic gas, which can cause death within a short period of time if inhaled in a small amount, and is highly corrosive to metals and cement and other materials. Natural gas and biogas are green and clean energy, which often contain a certain amount of hydrogen sulfide, and must undergo desulfurization treatment before pipeline transportation. my country is rich in sulfur-containing natural gas reserves, and natural gas reserves w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01B17/02
Inventor 邢建民宋子煜李望良李强
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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