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Method for removing humic substances from aqueous alkaline solution

A humus and alkaline technology, applied in the field of humus, can solve problems such as high inorganic sludge

Active Publication Date: 2018-04-17
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of metal salts, several problems such as the generation of high inorganic sludge

Method used

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  • Method for removing humic substances from aqueous alkaline solution
  • Method for removing humic substances from aqueous alkaline solution

Examples

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Embodiment

[0031] The present invention may be better understood by the following examples, which are provided for illustration only and should not be construed as limiting the invention.

[0032] Wastewater from bleaching contains humic substances such as dissolved lignin. Its removal by biological treatment is considered difficult. In this work, the precipitation of lignin using highly cationic starch according to the invention was investigated.

[0033] exist Coagulation acceleration and flocculation tests for COD removal were carried out in the mill laboratory. Tests were performed with fresh wastewater samples from the alkaline bleach filtrate line. The wastewater sample temperature was 65°C.

[0034] The batch size was 500ml in a microflocculator. The operation of the flocculator is as follows:

[0035] 1) Mix quickly (350rpm), add cationic starch coagulant (2000ppm) at the beginning, and finally add flocculant (2ppm);

[0036] 2) slow mixing (40rpm), and

[0037] 3) Settl...

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Abstract

The invention relates to a method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp. The method comprises obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and adding a high cationic starch having a charge density value ofat least 1.8 meq / g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.

Description

technical field [0001] The present invention relates to a method for the removal of humic substances comprising lignin, other lignin-like compounds and their decomposition products from aqueous alkaline solutions resulting from chemical pulp bleaching according to the independent claims presented below. Background technique [0002] The bleaching sequence of chemical pulp usually includes one or more oxidizer steps, so the bleaching conditions are alkaline with respect to pH. Under these conditions, lignin and other lignin-like compounds contained in the pulp are partially dissolved. After bleaching, the pulp is washed and the drained water is usually sent to a water treatment unit. Lignin is considered a difficult biodegradable substance and thus has a great influence on the properties of purified wastewater. Therefore, it is desirable to be able to remove dissolved lignin, other lignin-like compounds and their decomposition products from wastewater. [0003] Inorganic c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52B01D21/01C02F103/28
CPCB01D21/01C02F2103/28C02F1/5263C02F1/56C02F1/52C02F2101/30
Inventor J·阿尔格伦S·哈特图恩J·鲁特萨莱恩M·卢赫塔拉M·涅梅莱
Owner KEMIRA OY
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