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Treatment method for ash water of heating and power plant

A thermal power plant and water treatment technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of high operating costs, achieve low investment and operating costs, be beneficial to environmental protection, and save energy and water resources.

Active Publication Date: 2008-08-20
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The thermal power plant treats 9600 tons of ash water per day, and the cost of flocculant is 388.8 yuan, so the operation cost is very expensive

Method used

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  • Treatment method for ash water of heating and power plant

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Embodiment Construction

[0016] Embodiments of the invention:

[0017] In the process of alumina production, a large amount of red mud waste will be produced, which is usually transported and stored by wet method. After a period of storage, the solid and liquid will be separated, and the upper clarified water will be red mud return water, which will be used as ash water in thermal power plants. deal with. When treating the ash and slag water of thermal power plants, the ash and slag water containing a large amount of suspended matter should first enter the primary sedimentation tank to settle, reduce the suspended matter in the effluent to less than 5000 mg / l, and enter the water intake tank 3 through the valve 2, and return the red mud to the water Use the red mud return water pump 1 from the top of the water intake tank 3 to pump in, and the amount added is calculated in parts by weight. Add 2 to 8 parts of red mud return water for every 100 parts of ash water for control, and the suction force of t...

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Abstract

A process for treating the ash-contained sewage generated by power-and-heating plant features that the red mud contained back water generated in preparing alumina is mixed with said sewage to decrease the content of suspended substances.

Description

Technical field: [0001] The invention relates to a thermal power plant ash water treatment method, in particular to a thermal power plant ash water treatment method in an alumina production plant (system), and belongs to the technical field of thermal power plant wastewater treatment. technical background: [0002] At present, thermal power plants (including thermal power plants) generally adopt the method of adding a flocculant to the ash water to reduce the suspended matter content in the ash water to improve the settlement effect. This method in the prior art mainly has restrictive factors such as complex operation and expensive medicament cost. The cost of adding flocculant usually accounts for more than 50% of the total cost of water treatment, and sometimes even makes the cost of wastewater treatment higher than that of using new water and discharging The cost of waste water has increased the cost and pressure of ash and slag water treatment. [0003] The cost of floc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 蒋长智罗勇飞
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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