Method for treating sewage of artificial board fiber dry tail gas treatment

Abstract

The invention discloses a method for treating sewage of artificial board fiber dry tail gas treatment. Artificial board fiber dry tail gas enters the lower part of a spraying washing tower for removing dust and pollutants; circulating water enters the spraying washing tower from the upper part of the tower by a lifting pump and is in reverse contact with the tail gas; then the tail gas subjected to spraying in the tower enters a heat exchange condenser; generated condensate water is discharged into a hydrolysis tank; circulating water passing through the lower part of the tower enters a circulating water tank through a filter; the circulating water tank discharges water to an air floatation tank every day; and treated water discharged from the air floatation tank and the condensate water are discharged into the hydrolysis tank. The mixed wastewater is treated by the hydrolysis tank, and anoxic tank and a membrane bioreactor (MBR) tank; a nitrification liquid flows back to the anoxic tank and the discharged water of the hydrolysis tank is discharged to the anoxic tank; and the nitration liquid flows back to the circulating water tank for replenishment. Aiming at difficulty of tail gas purification wastewater pollution in a production process of an artificial board, the method arranges an online circulating water treatment system and a circulating water discharge bypass treatmentsystem, so that the problems of accumulation of suspended matter and accumulation of formaldehyde and organic matter in discharge water are solved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a treatment method for treating sewage-containing waste water with dry tail gas of man-made board fibers, in particular to a treatment method for sewage. Background technique [0002] Wood-based panel fiber drying tail gas is the tail gas produced by drying wood fibers after thermal grinding and sizing with hot air. Because the tail gas contains a large amount of organic matter and formaldehyde and other substances, the tail gas will exceed the standard. Because of its large gas volume and low concentration, the general treatment method is not applicable. The commonly used treatment method is to use wet spraying, which can basically ensure that the tail gas discharge meets the standard. However, during the treatment process, a large amount of wood fiber, organic matter and other pollutants enter the spray water, and the hot flue gas generated by the biomass boiler usually ...

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Problems solved by technology

[0004] In order to solve the problems existing in the background technology, the purpose of the present invention is to overcome the technical deficiency of the waste water pollution treatment of tail gas purification in the production process of wood-based panels and provide a kind of treatment method of waste water containing waste water from the tail gas of wood-based panel fiber drying

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