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Method using pre-conditioning to promote papermaking sludge dewatering

A papermaking sludge and preconditioning technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc. The effect of small addition, small capacity increase, and improved stability and reliability

Inactive Publication Date: 2019-05-10
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for promoting the dehydration of papermaking sludge through preconditioning. The method is easy to operate, has good dehydration effect, and the dosage of preconditioning agent used is small, and can effectively improve the stability of the sludge dewatering process. In order to solve the technical problems such as serious volume increase after sludge dehydration, lower calorific value, and secondary pollution to the environment in the prior art

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  • Method using pre-conditioning to promote papermaking sludge dewatering

Examples

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Embodiment 1

[0024] The sludge in this example is the remaining sludge taken from the secondary settling tank of a paper mill in Hunan, with a moisture content of 98.6%. Promoting papermaking sludge dewatering through pre-conditioning includes the following steps:

[0025] (1) Preparation of pre-conditioning agent: According to the solubility, the inorganic coagulant polyaluminum chloride, polyferric chloride and polyaluminum ferric chloride are derivatized according to the mass ratio of 2:1:1, and the organic flocculant is derived from cationic cellulose. Sodium silicate and water are added to make solutions separately;

[0026] (2) According to the order of inorganic coagulant, organic flocculant, inorganic coagulant and auxiliary agent, add 50% polyaluminum chloride, polyferric chloride and polyaluminum ferric chloride mixture, stir for 5 minutes, and then add Cationic cellulose derivatives, stir for 15 minutes, then add the remaining mixture of polyferric chloride and polyaluminum ferric s...

Embodiment 2

[0031] The sludge in this embodiment is the remaining sludge taken from the secondary settling tank of a paper mill in Shandong, with a moisture content of 99.1%. Promoting papermaking sludge dewatering through pre-conditioning includes the following steps:

[0032] (1) Preparation of conditioner solution: According to the solubility, the inorganic coagulant polyferric chloride and polyaluminum ferric chloride are mixed in a mass ratio of 2:1, organic flocculant acrylamide copolymer and additive dodecylbenzene Sodium sulfonate is added with water to make a solution;

[0033] (2) According to the order of inorganic coagulant, organic flocculant, inorganic coagulant and auxiliary agent, add 40% polyferric chloride and polyaluminum ferric sulfate mixture, stir for 5 minutes, and then add acrylamide copolymer. Stir for 15 minutes, then add the remaining mixture of polyferric chloride and polyaluminum ferric sulfate, stir for 5 minutes, add sodium dodecylbenzene sulfonate, and stir for...

Embodiment 3

[0039] The sludge in this example is the remaining sludge taken from the secondary settling tank of a paper mill in Jiangsu, with a moisture content of 97.3%. Promoting papermaking sludge dewatering through pre-conditioning includes the following steps:

[0040] (1) Preparation of conditioner solution: According to the solubility, the inorganic coagulant polyferric aluminum silicate, polyferric chloride and polyaluminum ferric chloride are mixed according to the mass ratio of 1:1:1, and the organic flocculant cationic cellulose derivative Add water to the additive chitosan glutamate to make a solution;

[0041] (2) According to the order of inorganic coagulant, organic flocculant, inorganic coagulant, auxiliary agent, add 50% polyferric aluminum silicate, polyferric chloride and polyaluminum ferric chloride mixture, stir for 5 minutes, and then Add the cationic cellulose derivative, stir for 15 minutes, then add the remaining inorganic coagulant, stir for 5 minutes, add chitosan g...

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Abstract

The invention provides a method using pre-conditioning to promote papermaking sludge dewatering and relates to the technical field of sludge dewatering. The method is characterized in that the inorganic coagulant is added in two steps during pre-conditioning, that is to say, the inorganic coagulant is added first, then the organic coagulant is added, the inorganic coagulant is added again, and auxiliaries are added finally, wherein the adding quantity of the inorganic coagulant is 10-20% of the dry weight of sludge; the adding quantity of the organic coagulant is 0.2-1.0% of the dry weight ofthe sludge; the adding quantity of the auxiliaries is 1.0-4.0% of the dry weight of the sludge. The method is small in pre-conditioning adding amount, convenient to use, good in dewatering effect, capable of using existing sludge dewatering facilities, simple in implementation process and capable of effectively increasing the stability and reliability of a sludge dewatering process.

Description

Technical field [0001] The invention relates to the technical field of sludge dewatering treatment, in particular to a method for promoting the dewatering of papermaking sludge through preconditioning. Background technique [0002] Paper sludge, as a by-product of wastewater treatment in paper-making enterprises, has also increased its output and has more complex components, containing organic matter, microorganisms, pathogens, viruses, and metals. Improper treatment can easily cause secondary pollution and cause great harm to the environment. . Therefore, economical and reasonable treatment of papermaking sludge has also aroused widespread concern in society. At present, the commonly used papermaking sludge treatment methods include sanitary landfill, mixed combustion, filler manufacturing, composting, building materials, etc. The premise of all these treatment methods is sludge dewatering. Sludge dewatering is a sludge treatment method that removes water from fluid native, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/147C02F11/143C02F11/122C02F103/28
Inventor 范述捷文飚苏振华
Owner CHINA NAT PULP & PAPER RES INST CO LTD