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Pretreatment process for recycling waste paper papermaking tail water

A waste paper papermaking and pretreatment technology, applied in the field of pulp and papermaking, can solve the problems of increasing the operating load of the reclaimed water reuse membrane treatment system and increasing operating costs

Pending Publication Date: 2022-03-11
CHINA CEC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Advanced oxidation and coagulation are traditionally used for advanced treatment. However, due to the addition of a large amount of salt-containing chemical reagents (such as strong acid, strong alkali, hydrogen peroxide, iron-containing catalysts, etc.), the total dissolved solids (TDS) and total salt in the effluent increase. The amount is 700~1500mg / L, and the hardness increases 50~150mg / L, which increases the operating load of the subsequent reclaimed water reuse membrane treatment system and increases the operating cost

Method used

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  • Pretreatment process for recycling waste paper papermaking tail water
  • Pretreatment process for recycling waste paper papermaking tail water
  • Pretreatment process for recycling waste paper papermaking tail water

Examples

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Embodiment 1

[0034] A pretreatment process for recycling tail water from waste paper and papermaking. When the hardness remover and adsorbent are added separately, and the hardness of the effluent from the biochemical pool is less than 200mg / L:

[0035] S1. Waste paper and papermaking tail water (water from the biochemical treatment section) first enters the dehardening clarification tank, adds 0.3g / L quicklime to it, stirs and reacts for 20 minutes, settles and clarifies for 1 hour, and the supernatant flows to the adsorption reaction tank by itself;

[0036] S2. First add modified attapulgite to the effluent of the hard clarification tank, the dosage is 0.2g / L, and the adsorption and stirring reaction is 30min; then add non-ionic polyacrylamide, the concentration of the solution is 2‰, the dosage 2‰, flocculation and stirring for 10 minutes; after flocculation and stirring, let it settle for 4 hours, reflux 50% of the sedimented sludge, and the supernatant flows to the coagulation reactio...

Embodiment 2

[0044] A pretreatment process for the recycling of waste paper and paper tail water. When the hardness remover and adsorbent are added separately, and the hardness of the biochemical pool effluent is greater than 200mg / L:

[0045] S1. Waste paper and papermaking tail water (water from the biochemical treatment section) first enters the hardening clarification tank, adds 0.5g / L quicklime to it, stirs and reacts for 10 minutes, settles and clarifies for 1.5 hours, and the supernatant flows to the adsorption reaction tank by itself ;

[0046] S2. Add modified attapulgite to the effluent of the hard clarification tank first, the dosage is 0.3g / L, and the adsorption and stirring reaction is 1h; then add anionic polyacrylamide, the concentration of the solution is 1.5‰, and the dosage is 1‰, flocculation and stirring for 10 minutes; after flocculation and stirring, let it settle for 5 hours, reflux 25% of the sedimented sludge, and the supernatant flows to the coagulation reaction t...

Embodiment 3

[0054] A pretreatment process for recycling tail water from waste paper and papermaking. When the hardness remover and adsorbent are added at the same time, and the hardness of the biochemical pool effluent is greater than 200mg / L:

[0055] S1. Waste paper and papermaking tail water (water effluent from the biochemical treatment section) first enters the adsorption reaction tank, and 0.5g / L quicklime and 0.2g / L modified attapulgite are added to it at the same time, and the adsorption and stirring reaction is carried out for 3 hours; then dosing Non-ionic polyacrylamide, the concentration of the configuration solution is 2‰, the dosage is 1‰, the flocculation and stirring reaction is 10min; Self-flow to the coagulation reaction tank;

[0056] S2. First add polyaluminium-iron to the effluent of the adsorption reaction tank, the dosage of coagulant is 1‰, coagulate and stir for 30 minutes; then add anionic polyacrylamide, the concentration of the solution is 2‰, and the dosage is...

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Abstract

The invention discloses a pretreatment process for recycling waste paper papermaking tail water, which comprises the following steps: (1) hardness removal: adding quick lime into the waste paper papermaking tail water subjected to biochemical treatment, stirring, standing and settling; (2) adsorption: successively adding an adsorbent and a flocculant into the sewage subjected to hardness removal, stirring, standing and settling; (3) coagulation: sequentially adding a coagulant and a flocculant into the adsorbed sewage, stirring, standing and settling; (4) filtering: filtering the sewage subjected to coagulation treatment through a sand filter, and treating effluent, wherein the effluent meets the inlet water quality requirement of a reclaimed water reuse treatment membrane system; and (5) sludge treatment: sludge generated in the processes of hardness removal, adsorption and coagulation reaction is treated in a centralized manner. The waste paper papermaking tail water recycling pretreatment process is low in operation cost, easy to operate, good in treatment effect and small in salt increment, the sewage desalination cost is reduced, and the membrane passing pressure of reclaimed water is relieved.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and relates to a pretreatment process for recycling waste water from papermaking tail water. Background technique [0002] In order to meet the needs of pulp and paper enterprises to increase production without increasing pollution, and to cope with increasingly stringent environmental protection policies and pollutant discharge standards, enterprises control the total amount of pollutants generated through upstream production, downstream sewage treatment and recycling ultra-low emissions. Aspects to achieve together. The recycling of pulping and papermaking sewage has become an important part of the whole process of pulping and papermaking production. It is mainly aimed at the further treatment of the effluent from the biochemical section of the sewage treatment station of pulping and papermaking enterprises to meet the water inlet requirements of the membrane separation section....

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F11/12
CPCC02F9/00C02F11/12C02F5/06C02F1/281C02F1/56C02F1/001
Inventor 葛强朱丛韵卜晨鹏张成峰向宁刘桂芳羊佩仪
Owner CHINA CEC ENG
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