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Disposing method and device of papermaking waste water

A technology for papermaking wastewater and a treatment method, applied in the field of water treatment, can solve problems such as large consumption of chemical agents, and achieve the effects of reducing membrane pollution and avoiding environmental damage

Active Publication Date: 2017-11-03
贵州西部环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The chemical method (lime-soda ash method or caustic soda-soda ash method) is a common method to reduce calcium ions in raw water, but the pH control of this method is relatively strict (generally, the pH should be above 8.5 to have an obvious precipitation effect), and the consumption of chemical agents bigger

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  • Disposing method and device of papermaking waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] In the first step, after primary sedimentation, 0.05wt% biodegradable flocculant chitosan is added to the wastewater for pulping and papermaking, and after the flocculation reaction, the flocs are precipitated;

[0085] In the second step, the wastewater treated in the first step is sent to the anaerobic reaction tower for reaction. The dissolved oxygen (DO) content in the anaerobic reaction tower is below 0.15mg / L, the pH is 6.5-7.5, and the sludge concentration is 5 ~12gVSS / L, mud age 60 days, temperature 20℃;

[0086] In the third step, after adding sodium carbonate precipitant to the product water in the upper part of the anaerobic reaction tower, it is sent to a tubular ceramic microfiltration membrane filter for filtration. The amount of sodium carbonate added is 0.1g more than that required for the complete precipitation of calcium ions. / L, the average pore size range of the microfiltration membrane in the tubular ceramic microfiltration membrane filter is 800nm...

Embodiment 2

[0091] In the first step, after primary sedimentation, 0.2wt% biodegradable flocculant chitosan is added to the wastewater for pulping and papermaking, and after the flocculation reaction, the flocs are precipitated;

[0092] In the second step, the wastewater treated in the first step is sent to the anaerobic reaction tower for reaction. The dissolved oxygen (DO) content in the anaerobic reaction tower is below 0.15mg / L, the pH is 6.5-7.5, and the sludge concentration is 5 ~12gVSS / L, mud age 100 days, temperature 32℃;

[0093] In the third step, after adding sodium carbonate precipitant to the product water in the upper part of the anaerobic reaction tower, it is sent to a tubular ceramic microfiltration membrane filter for filtration. The amount of sodium carbonate added is 0.1g more than that required for the complete precipitation of calcium ions. / L, the average pore size range of the microfiltration membrane in the tubular ceramic microfiltration membrane filter is 2000n...

Embodiment 3

[0098] In the first step, after primary sedimentation, 0.1t% biodegradable flocculant chitosan is added to the wastewater for pulping and papermaking, and after the flocculation reaction, the flocs are precipitated;

[0099] In the second step, the wastewater treated in the first step is sent to the anaerobic reaction tower for reaction. The dissolved oxygen (DO) content in the anaerobic reaction tower is below 0.15mg / L, the pH is 6.5-7.5, and the sludge concentration is 5 ~12gVSS / L, mud age 80, temperature 28℃;

[0100] In the third step, after adding sodium carbonate precipitant to the product water in the upper part of the anaerobic reaction tower, it is sent to a tubular ceramic microfiltration membrane filter for filtration. The amount of sodium carbonate added is 0.1g more than that required for the complete precipitation of calcium ions. / L, the average pore size range of the microfiltration membrane in the tubular ceramic microfiltration membrane filter is 1000nm, the cr...

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Abstract

The invention relates to a disposing method and device of papermaking waste water, and belongs to the technical field of water disposal. The disposing method includes steps of initially settling waste water for pulping and papermaking, and then adding biodegradable flocculating agent to perform the flocculating reaction; settling the flocculate; delivering the disposed waste water to an anaerobic reaction tower to react; after adding sodium carbonate precipitant in the produced water at the upper part of the anaerobic reaction tower, delivering to a tubular ceramic micro-filtration membrane filter to filter; delivering concentrated fluid of the tubular ceramic micro-filtration membrane filter to a plate frame type filter to perform filter pressing; returning the waste water after filter pressing to an anaerobic reaction tower to dispose; delivering the produced water of the tubular ceramic micro-filtration membrane filter to an aerobiotic pond to react; after settling the produced water of the aerobiotic pond through a settling pond, delivering the waste water to the ceramic micro-filtration membrane filter to filter; delivering penetrated liquid of the ceramic micro-filtration membrane filter to a reverse osmosis membrane to filter.

Description

technical field [0001] The invention relates to a treatment method and device for papermaking wastewater, belonging to the technical field of water treatment. Background technique [0002] The paper industry is a traditional large water user and one of the important sources of water pollution. With the development of the economy, enterprises are increasingly facing the problems of water shortage and shortage of raw materials. On the other hand, water pollution is becoming more and more serious. At present, my country's paper industry wastewater discharge and COD discharge rank first in my country's various industrial discharges, and the paper industry has the most serious pollution to the water environment. the primary issue to be addressed. [0003] Pulping and papermaking wastewater refers to the cooking waste liquid (also known as black liquor and red liquor) produced by chemical pulping, the middle water produced in the pulp washing and bleaching process, and the whit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/28C02F101/10
CPCC02F1/001C02F1/441C02F1/444C02F1/463C02F3/30C02F9/00C02F2001/007C02F2101/10C02F2103/28C02F2301/046
Inventor 毛强平
Owner 贵州西部环保科技股份有限公司
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