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A papermaking wastewater treatment process

A technology for papermaking wastewater and treatment process, applied in the field of papermaking industry, can solve the problems of low recycling rate, low efficiency and high cost, and achieve the effects of prolonging service life, improving degradation efficiency and delaying attenuation

Active Publication Date: 2020-05-29
WUHAN CHENMING HANYANG PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many treatment processes for papermaking wastewater. The most representative one is the traditional method of direct chemical treatment. This method has a low recycling rate, and the discharged treated wastewater still contains a large amount of harmful substances, and the cost is high. Efficiency The second is to use the plasma exchange method, which has high requirements for operators. As far as the current paper industry is concerned, it is necessary to increase the investment in high-level talents in this regard. After the wastewater is treated, it is still in a state of eutrophication.

Method used

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  • A papermaking wastewater treatment process

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Experimental program
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Effect test

Embodiment 1

[0023] The COD in the papermaking wastewater to be treated is 4803mg / L, and the SS is 570mg / L.

[0024] Filter the papermaking wastewater to be treated through the grid, introduce it into the homogenization tank, add acid to adjust the pH value to 6.8, and the residence time is 0.5 hours; enter the treated wastewater into the coagulation tank, add magnetic seeds and coagulant polyacrylamide , wherein the amount of polyacrylamide added is 50ppm, the mass ratio of the magnetic seed to polyacrylamide is 1:2, fully stirred and mixed, and then magnetically separates the mixed liquid by using a disk to separate the mud and water; the treated wastewater Enter the micro-electrolysis treatment: add a small amount of acid to the iron-carbon micro-electrolysis cell to adjust the pH value to 3.5, and perform iron-carbon micro-electrolysis. At the same time, the bottom of the iron-carbon micro-electrolysis cell is aerated. Hours; the treated wastewater is sent to the first-level UASB and t...

Embodiment 2

[0026] The COD in the papermaking wastewater to be treated is 4503mg / L, and the SS is 450mg / L.

[0027] Filter the papermaking wastewater to be treated through the grid, introduce it into the homogenization tank, add acid to adjust the pH value to 7, and the residence time is 0.5 hours; enter the treated wastewater into the coagulation tank, add magnetic seeds and coagulant polyacrylamide , wherein the amount of polyacrylamide added is 60ppm, the mass ratio of the magnetic seed to polyacrylamide is 1:2.5, fully stirred and mixed, and then magnetically separates the mixed liquid by using a disk to separate the mud and water; the treated wastewater Enter the micro-electrolysis treatment: add a small amount of acid to the iron-carbon micro-electrolysis cell to adjust the pH value to 3, and carry out iron-carbon micro-electrolysis. At the same time, the bottom of the iron-carbon micro-electrolysis cell is aerated. Hours; the treated wastewater is sent to the first-level UASB and t...

Embodiment 3

[0029] The COD in the papermaking wastewater to be treated is 3675mg / L, and the SS is 1080mg / L.

[0030]Filter the papermaking wastewater to be treated through the grid, introduce it into the homogenization tank, add acid to adjust the pH value to 7.2, and the residence time is 1 hour; enter the treated wastewater into the coagulation tank, add magnetic seeds and coagulant polyacrylamide , wherein the amount of polyacrylamide added is 80ppm, the mass ratio of the magnetic seed to polyacrylamide is 1:3, fully stirred and mixed, and then magnetically separates the mixed liquid by using a disk to separate the mud and water; the treated wastewater Enter the micro-electrolysis treatment: add a small amount of acid to the iron-carbon micro-electrolysis cell to adjust the pH value to 4, and carry out iron-carbon micro-electrolysis. At the same time, the bottom of the iron-carbon micro-electrolysis cell is aerated. Hours; the treated wastewater is sent to the first-level UASB and the ...

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Abstract

The invention belongs to the technical field of papermaking industry and specifically relates to a papermaking wastewater treatment process. Papermaking wastewater is treated by using a coagulation-microelectrolysis-two-stage UASB-biological contact oxidation-ion exchange-activated carbon-ultraviolet disinfection combined process, so that refractory organic matters, suspended matters, SS and microorganisms in the treated papermaking wastewater are efficiently removed. Meanwhile, resin is rapidly regenerated within a short period by using a regeneration solution provided by the invention, and the attenuation of the resin can be delayed due to the addition of sophorolipids and trehalose ester in the regeneration solution, so that the service life of the resin is greatly prolonged, the wastewater decoloration efficiency is increased, and the operation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of papermaking industry, and in particular relates to a treatment process for papermaking wastewater. Background technique [0002] The output of my country's pulp and paper industry has ranked third in the world. In recent years, the output of paper and paperboard has remained at about 27 million t / a. The paper industry has high energy consumption and material consumption, and serious environmental pollution. Among them, SS, The high concentration of COD has brought great harm to the environment and human health. Papermaking industrial wastewater is a kind of difficult-to-treat organic wastewater with large water volume, high chroma, high content of suspended solids, high concentration of organic matter and complex components. There are three main sources of papermaking wastewater: pulping waste liquid, mid-stage water, and paper machine white water: pulping is to separate the fibers in plant raw materials,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/30C02F103/28
CPCC02F1/001C02F1/283C02F1/32C02F1/42C02F1/461C02F1/488C02F1/56C02F1/66C02F3/30C02F7/00C02F9/00C02F2001/422C02F2101/30C02F2103/28C02F2303/04
Inventor 胡茂宅
Owner WUHAN CHENMING HANYANG PAPER
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