Coal gasification wastewater treatment process

A technology for coal gasification wastewater and treatment process, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Improved effect, avoidance of water quality effects, effect of increased treatment steps

Inactive Publication Date: 2011-05-25
北京国能普华环保工程技术有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention lies in the coal chemical industry wastewater treatment process in the prior art, adding activated carbon into the activated sludge aeration tank, affecting the effect of biochemical treatment and adsorption treatment, thus proposing a biochemical and adsorption treatment Coal gasification wastewater treatment process with high treatment efficiency and adsorption treatment alone

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Effect test

Embodiment 1

[0036] figure 1 The flow chart of the coal gasification wastewater treatment process and its system according to the present invention is given. The system includes a regulating tank for wastewater inflow, a primary adsorption tank, a first sedimentation tank, a first biochemical unit, a secondary adsorption tank, The second settling tank, the second biochemical unit and filtering equipment, the above-mentioned equipment and structures are connected in sequence through pipelines. The coal gasification wastewater treatment process described in this system is as follows:

[0037] (1) Adsorption treatment in the primary adsorption pool: the coal gasification wastewater in the wastewater regulating pool is passed into the primary adsorption pool, and the adsorption material is continuously added in the primary adsorption pool, and the adsorption material has a good effect on the coal gasification wastewater. Adsorption treatment of macromolecular refractory organic pollutants;

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Embodiment 2

[0047] On the basis of the above-mentioned Example 1, the activated coke discharged from the bottom of the second sedimentation tank in the step (5) is returned to the primary adsorption tank for reuse, and the primary adsorption tank does not need to add new active coke. Such as figure 2 As shown, in this embodiment, the mass ratio of the active coke solution that flows back to the primary adsorption pool to the influent of the primary adsorption pool is 50:100, and it can also be determined according to the concentration of wastewater and the utilization rate of active coke. This reflux ratio is selected within the range of 5:100-200:100. During this process, the coke powder discharged from the bottom of the second sedimentation tank is refluxed to the primary adsorption tank through the pump, and the coke powder discharged here is refluxed in the form of coke aqueous solution. In the returned coke aqueous solution, the content of coke Around 30%.

[0048] In this embodim...

Embodiment 3

[0050] On the basis of the above-mentioned Example 1, the activated coke discharged through the first sedimentation tank in the step (2) is returned to the secondary adsorption tank in the step (4), such as image 3 As shown, the mass ratio of the refluxing coke aqueous solution to the water inflow of the secondary adsorption tank is 200:100. Recycling of the active coke can also be realized through such a cycle, and its use efficiency can be improved.

[0051] In this embodiment, active semi-coke is continuously added in the primary adsorption pool; in the primary adsorption pool, the mass ratio of water to active coke is 50:1; in the step (3), the biochemical The dwell time of processing is 10 hours in the present embodiment, generally selects about 10-60 hour according to the organic pollutant concentration of waste water; In described step (6), the dwell time of described biochemical treatment is selected 5 hours here, here The time is generally selected for 5-30 hours ac...

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Abstract

The invention discloses a coal gasification wastewater treatment process, which comprises the following steps of: performing adsorption treatment in a primary adsorption tank; performing sedimentation treatment in a first sedimentation tank; performing biochemical treatment in a first biochemical unit; performing adsorption treatment in a secondary adsorption tank; performing sedimentation treatment in a second sedimentation tank; performing biochemical treatment in a second biochemical unit; and filtering and discharging. The coal gasification wastewater treatment process solves the technical problem that active carbon is added into an active sludge aeration tank to influence the effects of the biochemical treatment and the adsorption treatment in the conventional coal gasification wastewater treatment process, has the advantages of independent adsorption and biochemical treatment, combined arrangement, concise process, high treatment efficiency, no increase of salt content and stable operation, and is particularly suitable for treating coal gasification wastewater.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment process for coal gasification wastewater. Background technique [0002] The water quality of coal gasification wastewater is complex, which not only contains small molecular organic acids, unit phenols, ammonia nitrogen, etc., but also contains a large number of macromolecular refractory and toxic pollutants, mainly polyphenols, polycyclic aromatic hydrocarbons and heterocyclic compounds, etc. Degradation of organic matter, high ammonia nitrogen, high chroma, etc., COD in wastewater after recovery of phenol ammonia Cr (with potassium dichromate (K 2 Cr 2 o 7 ) as an oxidant, the chemical oxygen demand) is generally around 5000mg / L, ammonia nitrogen is 200-500mg / L, which is a typical industrial wastewater containing refractory organic compounds. [0003] At present, for coal gasification wastewater, most domestic coal chemical enterprises adopt biochemical waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 张毅刘振强滕济林朱永平苗文华李若征何鹏曹效鑫程建龙
Owner 北京国能普华环保工程技术有限公司
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