Cellulose wastewater pretreatment apparatus and application thereof

Abstract

The invention relates to a cellulose wastewater pretreatment apparatus. The apparatus comprises an apparatus body, a treatment system, an overflow weir, a water outlet tube, a water inlet, a sand inlet, a sludge backflow port, a sand conveying pipe and a sludge storage pool. A flocculation reaction is carried out through using the macromolecular long chain characteristics of pollutants contained in wastewater by adopting a reverse flocculation method through adopting the pollutants as a flocculation adsorption bridge formation medium and backflow sludge and an added flocculation core as settlement power to form large floccules, and parts of SS, bacteria and dissolved matters in wastewater are adsorbed, and are separated and settle from a precipitation area, so full mixing and co-precipitation of cellulose molecules and floc in the wastewater are realized, thereby the cellulose concentration in the early stage pretreatment of wastewater treatment is greatly reduce, the treatment load is reduced for subsequent treatment, and the apparatus has the advantages of short retention time, good treatment effect, great reduction of the pollutant load, and great saving of the construction investment and the running investment in after-treatment.

Description

technical field [0001] The invention belongs to the technical field of wastewater pretreatment equipment, in particular to a cellulose wastewater pretreatment device and its application. The device is suitable for the pretreatment of cellulose production wastewater discharged during the cellulose production process. Background technique [0002] At present, no major breakthrough has been made in the field of high-salt cellulose wastewater treatment in the world. [0003] The main sources of cellulose wastewater are: circulating water for cooling in the cellulose synthesis stage in the reactor; rectification raffinate when solid cellulose semi-finished products are obtained; solid-liquid separation aqueous solution produced in the solid-liquid separation stage of the centrifuge. [0004] 1. In the reaction stage of the reactor, this process requires isolation cooling through the jacket of the reactor. The water is generally tap water, and the water quality is good. However, d...

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Problems solved by technology

[0007] Due to its characteristics of high salt, high COD, and low BC ratio, it is very difficult for biochemical treatment to be applied in practice

At the same time, cellulose production enterprises are generally small in scale, and it is difficult for enterprises to accept the investment cost of advanced oxidation, medium temperature anaerobic and other processes.

At the same time, the quality of the operation and maintenance personnel of the enterprise is also difficult to meet the operational requirements of complex processes

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