A papermaking wastewater treatment system

Abstract

The invention discloses a paper-making wastewater treatment system. The paper-making wastewater treatment system is composed of an adjusting tank, a primary sedimentation tank, a magnetic sorting separator, a pH adjusting tank, a stepped flocculator and a charcoal filter tank. A water inlet pipe is connected to the adjusting tank. The adjusting tank is connected to the primary sedimentation tank through a water pipe. The primary sedimentation tank is connected to the magnetic sorting separator through a water pipe. The magnetic sorting separator is connected to the pH adjusting tank through a water pipe. The pH adjusting tank is connected to the stepped flocculator through a water pipe. The stepped flocculator is connected to the charcoal filter tank through a water pipe. A water outlet pipe is connected to the back of the charcoal filter tank. The paper-making wastewater treatment system has the beneficial effects that the treatment effect is good; the magnetic sorting separator is simple in structure, and a semicircular S-pole magnet and an N-pole magnet are arranged at the two sides of the round tank, so that a magnetic field is formed in the tank continuously and stably; and two-stage adjustment is adopted for the pH adjusting tank, firstly, a large-range pH value is achieved through adjustment conducted in a first-stage neutralizing tank, and then a precise pH value is achieved through adjustment conducted in a second-stage neutralizing tank.

Description

technical field [0001] The invention relates to a papermaking wastewater treatment system, which belongs to the technical field of environmental protection engineering. Background technique [0002] The paper industry uses wood, straw, reeds, rags, etc. as raw materials, and cellulose is separated by high-temperature and high-pressure cooking to make pulp. In the production process, the non-cellulose part of the raw material is finally discharged to become papermaking black liquor. The black liquor contains lignin, cellulose, volatile organic acids, etc., which has an odor and is highly polluting. [0003] There are also many treatment methods for paper industry wastewater, for example: flotation method can recycle fibrous solid matter in white water, the recovery rate can reach 95%, and clarified water can be reused; combustion method can recycle sodium hydroxide, sodium sulfide, sulfuric acid in black water Sodium and other sodium salts combined with organic matter. Neu...

AI Technical Summary

Problems solved by technology

At present, the "biological + chemical" method is the most used method. The front end uses biological strains to adsorb, and the back end uses flocculants to precipitate pollutants in the water. However, because the COD / BOD of papermaking wastewater is generally less than 0.2, its viability is very poor. Very unfavorable to the operation of biological methods

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