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Biological treatment method of coal gas waste water and coking waste water

A coking wastewater and biological treatment technology, applied in the direction of sustainable biological treatment, biological water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of poor sludge settling, slow sludge growth, and inability to remove o-cresol and other problems, to achieve the effect of improving treatment efficiency, high removal rate, and alleviating the pressure of nitrification load

Inactive Publication Date: 2009-03-18
SHANGHAI UNIV OF ENG SCI
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AI Technical Summary

Problems solved by technology

From the above, it can be seen that the anaerobic pretreatment has little significance for the subsequent aerobic nitrification, because the o-cresol cannot be removed in this section, and the removal of phenol is also limited.
[0008] Due to the neglect of the leading role of the aerobic treatment process and the actual effect of anaerobic or anoxic treatment, the main problems of the existing biological treatment process in the treatment of gas wastewater and other phenolic wastewater can be summarized as follows: susceptible to water quality fluctuations, sludge growth Slow, poor sludge settling and effluent COD and NH 3 —N is too high

Method used

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  • Biological treatment method of coal gas waste water and coking waste water

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Embodiment 1

[0028] A gas plant produces an average of 2,000 cubic meters of wastewater per day. The current operating treatment process is: oil removal-dephenol-distillation three-stage activated sludge biological treatment 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. This new process has a better treatment effect on the actual gas wastewater. The combination process of activated sludge method unit, anoxic biological filter unit and biological contact oxidation unit is adopted. The first unit uses activated sludge method, and the second unit uses anoxic biological filter for anoxic treatment. The third unit adopts the biological contact oxidation method to carry out continuous flow operation and treatment of coal gas and coking wastewater. The described activated sludge method is an ordi...

Embodiment 2

[0032] The current wastewater treatment process in a gas plant is the traditional activated sludge method. Due to the change of raw coal, the system treatment effect has deteriorated. Although it has been modified many times, the water output effect is still not good. Adopt aerobic-anoxic-aerobic three unit combination process to process, the first unit activated sludge method of described three unit combination process is the activated sludge method that adds powder material, and its hydraulic retention time is 24 hours, and the solid residence time is 25 days; the subsequent second unit anoxic biological filter is filled with a zeolite carrier with a particle size of 15 mm. After 10 hours, add zeolite or organic carrier to the contact oxidation tank of the third unit, and its hydraulic retention time is 10 hours.

[0033] The dissolved oxygen in the activated sludge system of the first unit and the contact oxidation tank in the third unit of the three-unit combined process i...

Embodiment 3

[0037] The biological treatment method of gas waste water and coking waste water adopted by a certain gas plant adopts aerobic-anoxic-aerobic three-unit combination process for treatment, and the first unit activated sludge process of the three-unit combination process is The activated sludge method with powdered materials, the hydraulic retention time is 20 hours, and the solid retention time is 20 days; the subsequent second unit anoxic biological filter is filled with a zeolite carrier with a particle size of 10 mm, and the temperature in the anoxic section is controlled at 30°C In the aerobic section, the temperature is controlled at 25°C, and its hydraulic retention time is 10 hours. The subsequent third unit contact oxidation tank is filled with zeolite or organic carrier, and its hydraulic retention time is 10 hours.

[0038] The dissolved oxygen in the activated sludge system of the first unit and the contact oxidation tank of the third unit of the three-unit combinatio...

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Abstract

The invention relates to a biological treatment method of coal gas waste water and coking waste water. The method adopts a combined process of an activated-sludge process unit, an anoxic biological filtering pool unit and a biological contact oxidation unit, and treats the coal gas waste water and the coking waste water in a continuous stream mode. The specific treatment process is as follows: firstly, in the activated-sludge process unit, raw waste water enters an activated-sludge reactor for aerobic biological treatment; after the aerobic biological treatment, the mixed liquor enters a secondary sedimentation tank to separate the sludge from the water. A part of precipitated sludge flows back to the reactor and the residual part is discharged; the separated water enters the anoxic biological filtering pool unit for anoxic treatment in the anoxic biological filtering pool unit and the treated water enters the biological contact oxidation unit for further aerobic biological treatment. Compared with the prior art, the method of the invention has the advantages of acceptance of waste water with higher concentration, high treatment efficiency, stable and reliable running and easy management, etc.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a biological treatment method for gas wastewater and coking wastewater. Background technique [0002] Both coal gas wastewater and coking wastewater belong to coal conversion wastewater, which is wastewater generated during the process of gas generation, coking and coking product recovery. Phenolic substances are the main components of organic matter in wastewater, accounting for about 60% to 80% of the total organic matter, including extended unit phenols, dihydric phenols and polyphenols; in addition, they also contain polycyclic aromatic hydrocarbons (PAHs), containing nitrogen, oxygen and Sulfur heterocyclic compounds, many of which are mutagenic substances; inorganic compounds in wastewater mainly include cyanide, rhodanide and a large amount of ammonia, all of which are pollutants strictly controlled in my country. Therefore, if the gas waste water is directly discharged int...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/12C02F3/08C02F1/52
CPCY02W10/10
Inventor 张文启
Owner SHANGHAI UNIV OF ENG SCI
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