Device for treating wastewater produced in production process of alkaline peroxide mechanical pulp (APMP)

Abstract

The invention discloses a device for treating wastewater produced in the production process of alkaline peroxide mechanical pulp (APMP). The device consists of a grid trench, an adjustment primary settlement tank, a shallow layer air floatation device, a middle water tank, a cooling tower, an upflow anaerobic sludge blanket (UASB), a hydrolysis and acidification tank, a middle settlement tank, a cyclic activated sludge system (CASS) biochemical tank, a secondary settlement tank and an advanced oxidation tank which are sequentially connected; the secondary settlement tank is connected with a sludge concentration tank; the sludge concentration tank is connected with a belt dehydrator; the CASS biochemical tank comprises an organism selection area adopting an anaerobic environment, a facultative area which has the effect of buffering water quality, and a main reaction area for degrading organic matter; the main reaction area is provided with an oxygen supply system which ensures long sludge age and low sludge load; and an ozone composition is arranged in the advanced oxidation tank to reduce chemical oxygen demand (COD). The UASB, hydrolysis and acidification, CASS and advanced oxidation process combined device is adopted, so that wastewater produced in the production process of APMP can be effectively treated, and the index of effluent reaches the requirement of GB3544-2008.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a treatment device for APMP pulping wastewater. Background technique [0002] The principle of APMP (Alkaline Peroxide Mechanical Pulping) pulping is to extrude the raw material with a high compression ratio screw before refining, to strengthen the soaking of the liquid medicine, and then add chemicals such as hydrogen peroxide and sodium hydroxide to carry out the bleaching reaction. , thus saving a series of equipment for bleaching after refining. The APMP method is characterized by combining pulping and bleaching, the production process is simple, the production cost is low, the pulp yield is high, the strength is good, the whiteness is high, the utilization rate of fiber raw materials is improved, and the consumption of fiber raw materials is directly reduced. It has developed rapidly in recent years and has become the main method of high-yield pulping in t...

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Problems solved by technology

[0006] The invention provides a treatment device for APMP pulping wastewater to solve the problems of easy clogging of the filter membrane, high cost and poor treatment effect caused by sludge swelling in the existing APMP pulping wastewater treatment.

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