Pulp sewage treatment method for paper-making factory

Abstract

The invention discloses a pulp sewage treatment method for a paper-making factory. The pulp sewage treatment method includes the steps: leading pulp sewage into a primary filter tank, adding flocculating agents into the primary filter tank and reducing the concentration of the pulp sewage; guiding the sewage into a sewage filtering device, filtering the sewage and filtering and separating the pulpsewage again; fishing deposited pulp from the sewage by a spoon net; guiding the separated sewage into an aeration tank, performing aeration, adding hemp threads or artificial fiber yarns into the aeration tank and manually fishing floating agglomerated hemp threads or artificial fiber yarns from the sewage; sequentially leading the aerated sewage into an aerobic biological reaction tank and an anaerobic biological reaction tank and performing aerobic and anaerobic treatment; leading the sewage subjected to anaerobic treatment into an open-air drying tank and performing evaporation drying. Bythe aid of multistage filtering, aerobic and anaerobic treatment and evaporative treatment, the treatment technology process of the sewage is greatly simplified, and the pulp sewage treatment methodhas good application effects.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a method for treating pulp sewage used in paper mills. Background technique [0002] Pulp wastewater refers to the wastewater generated in the papermaking process. The direct discharge of such wastewater will seriously affect the environment, and a large amount of pulp often remains in the pulp wastewater, which has a very high recycling value. Therefore, pulp wastewater often needs to be treated before being discharged. Filtration treatment collects the pulp inside and recycles it, so as to reduce environmental pollution and save production costs. [0003] But existing filter device that is used for pulp waste water still has certain defect when in use, because often adopt the mode that the paper pulp in the waste water is collected with filter screen in filtering process, the paper pulp that gathers on the filter screen also needs to be removed when removing so. Flush with...

AI Technical Summary

Problems solved by technology

[0003] But existing filter device that is used for pulp waste water still has certain defect when in use, because often adopt the mode that the paper pulp in the waste water is collected with filter screen in filtering process, the paper pulp that gathers on the filter screen also needs to be removed when removing so. Flush with clean water, so there is a defect of wasting water resources

[0004] At the same time, due to the difference in the concentration of the pulp and the tendency of the pulp to settle, when the pulp is processed, it is easy to cause the processing equipment to fail to operate normally, which not only easily causes damage to the equipment, but also prolongs the sewage treatment due to the increased maintenance time cycle and cost

Images