Biological treatment method of coal gas effluent and coking effluent

A coking wastewater and biological treatment technology, which is applied in the direction of aerobic and anaerobic treatment, can solve the problems of slow sludge growth, the system is easily affected by water quality fluctuations, and poor sludge settlement, so as to save dilution water and high removal rate rate, reduce the effect of COD value

Inactive Publication Date: 2005-03-23
HARBIN INST OF TECH
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  • Summary
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  • Application Information

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Problems solved by technology

However, in order to obtain better effluent water quality and increase the efficacy of biological treatment, the role of the anaerobic section must also be considered. The question is how to make better use of these effects
[0015] Because the existing biological treatment process ignores the leading role of the aerobic treatment process and the actual effect of anaerobic or anoxic treatment, the system is vulnerable to water quality fluctuations, sludge growth is slow, and sludge Poor settleability and effluent COD and NH 3 -N is too high and other issues

Method used

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Comparison scheme
Effect test

specific Embodiment approach 1

[0017] Specific Embodiment 1: The treatment method of this embodiment is, firstly, control the total phenol concentration in the water to be 50-2000 mg / L, and then control the biochemical environment in the bioreactor to be aerobic-anaerobic-aerobic in sequence, the aerobic section The controlled temperature in the reactor is 15-30°C, and the controlled temperature in the reactor in the anaerobic section is 15-37°C; the dissolved oxygen in the aerobic section is controlled at 3-10mg / L, and the dissolved oxygen in the anaerobic section is controlled at 2-0.2mg / L L; The primary aerobic treatment stage is activated sludge method or biofilm method, the subsequent anaerobic stage is biofilm method, and the subsequent secondary aerobic stage is biofilm method; the filler used in biofilm method is quartz sand, Activated carbon, diatomaceous earth or zeolite; the particle size of quartz sand, granular activated carbon and zeolite biological carrier is 0.2-15 mm; the hydraulic retention...

specific Embodiment approach 2

[0018] Specific embodiment two: this embodiment is an experiment done to confirm the outstanding effect of the present invention: the average daily waste water of a certain gas plant is 2000 cubic meters, and the current operating treatment process is: deoiling-dephenol-distilling ammonia three-stage activated sludge biological processing system. Due to the poor pretreatment effect and large fluctuations in water quality, it has a great impact on the subsequent biological treatment system, resulting in poor sludge settling, serious biomass loss, and deterioration of treatment effect.

[0019] Influent water quality: COD concentration is about 1800-3600 mg / L, NH 3 -N concentration is 300-100 mg / liter.

[0020] The method of the present invention is used to treat the water quality, that is, to control the biochemical environment of aerobic-anaerobic-aerobic in the reactor, the control temperature in the aerobic section reactor is 18°C, and the dissolved oxygen is controlled at ...

specific Embodiment approach 3

[0021] Specific Embodiment Three: This embodiment is another experiment done to confirm the outstanding effect of the present invention. The existing waste water treatment process of a certain gas plant is the traditional activated sludge method. Due to the change of raw coal, the system treatment effect deteriorates. After several modifications, the water outlet effect is still not good.

[0022] Adopt the processing method of the present invention, control the biochemical environment of aerobic-anaerobic-aerobic successively in the reactor, the control temperature in the aerobic section reactor is 28 ℃, and dissolved oxygen is controlled at 8mg / L; Anaerobic section reactor The internal control temperature is 20°C, and the dissolved oxygen is controlled at 0.5mg / L; the first-stage aerobic treatment stage is activated sludge method, the subsequent anaerobic stage is biofilm method, and modified quartz sand carrier is added, and the subsequent stage is aerobic The stage is biof...

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Abstract

A biologic process for treating gas waste water and coking waste water features that the environment in the reactor is controlled to be sequential aerobic environment, anaerobic environment and aerobic environment for high treating effect and settling speed of mud.

Description

Technical field: [0001] The invention relates to a sewage treatment method. Background technique: [0002] Coal gas is a clean gaseous fuel. my country is a country where coal is the main energy source, and coal resources suitable for gasification account for about 80% of all coal resources, reaching 500 billion tons. Therefore, active development of coal gasification has important practical and long-term significance to protect our country's environment and promote economic development. However, a series of environmental problems have been brought about during the coal conversion process, among which the gas waste water and coking waste water are the most harmful. [0003] The chemical composition of coal gas wastewater and coking wastewater is relatively complex, and the composition of the gas wastewater discharged by different gas generation stations is also quite different due to the different raw coal and gas production process. The main organic components in wastewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 马军张文启
Owner HARBIN INST OF TECH
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