Method for processing paper-making waste water of regenerative paper

A treatment method and technology for papermaking wastewater, applied in biological water/sewage treatment, flotation water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as failure to meet discharge standards, excessive harmful substances, etc.

Inactive Publication Date: 2007-11-28
云南恒昌造纸有限责任公司
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Problems solved by technology

[0010] In order to solve the problem that the harmful substances in the current waste water treatment of recycled paper papermaking exceed the standard and cannot...

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  • Method for processing paper-making waste water of regenerative paper

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Embodiment Construction

[0022] A method for treating recycled paper and papermaking wastewater, the method comprising the steps of:

[0023] (1) Use a grid with a grid pitch of 0.22mm to filter the wastewater that flows out after papermaking, and the filtered wastewater flows into the fiber recovery tank to recover fibers and other suspended matter in the wastewater; it can also be filtered with a 70-mesh nylon mesh;

[0024] (2), the waste water in the fiber recovery tank flows into the inclined plate settling tank, and the granular impurities in the waste water are removed by settling, and the settling time is 8 hours;

[0025] (3) Flow the wastewater in the inclined plate sedimentation tank into the air flotation tank, add flocculant to the air flotation tank, mix the flocculant and wastewater evenly, and condense the fine fibers in the water;

[0026] (4) Remove the suspended solids, salvage the suspended solids after the reaction of the wastewater and the flocculant in the air flotation tank to ...

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Abstract

The process of treating effluent from making paper with waste paper belongs to the field of industrial effluent treating technology, and aims at lowering the harmful matter content in the effluent from making paper with waste paper to reach the exhaust standard. The process includes the first passing the effluent through grating to filter out fiber and suspended matter, the subsequent settling in a sloping plate settling tank to eliminate granular impurity, flocculating in an air floating tank with flocculant and fishing out the resultant suspended matter, anaerobic reaction in an anaerobic settling tank, treating with introduced air and active sludge in an aeration tank and eliminating suspended matter and colloidal matter, clarifying in a settling tank, and treating in artificial wetland to eliminate nitrogen and phosphate and obtain clear water. The process can reduce SS, BOD5 and CODcr of the effluent obviously and make the effluent reach draining standard.

Description

technical field [0001] The invention belongs to the technical field of industrial sewage treatment, and in particular relates to a papermaking wastewater treatment method. Background technique [0002] Waste paper and papermaking uses waste board paper, waste newspapers, waste books and periodical paper as the main raw materials to produce white board paper, container board paper, corrugated paper and other products of various specifications. Waste paper and papermaking wastewater mainly contains pollutants such as hemicellulose, lignin, inorganic acid salts, fine fibers, inorganic fillers, inks, and dyes. Lignin and hemicellulose mainly form COD and BOD in wastewater 5 ; Fine fibers, inorganic fillers, etc. mainly form SS; inks, dyes, etc. mainly form chroma and COD. These pollutants comprehensively reflect that the SS and COD indicators of wastewater are relatively high. [0003] At present, the most commonly used treatment technologies for wast...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52C02F1/24C02F3/30C02F3/32
Inventor 刘水生杨来有
Owner 云南恒昌造纸有限责任公司
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