Process for treatnig paper-making waste water of waste paper

A treatment method and papermaking technology from waste paper, which are applied in biological water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., which can solve the problem of heavy equipment maintenance, high operating cost and large investment. and other problems, to achieve the effect of reducing operating costs, saving operating costs and improving processing efficiency

Inactive Publication Date: 2005-03-02
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

At present, the treatment of waste paper and papermaking wastewater mostly adopts primary physical and chemical treatment, mainly including sedimentation and air flotation treatment methods, but these methods have poor treatment effects, and it is difficult to meet the discharge standards required by the country. Some factories also use primary physical and chemical treatment. Secondary biochemical treatment is adopted, but this method requires large investment, high operating costs, and a large amount of equipment maintenance, which is difficult for ordinary paper mills to bear

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  • Process for treatnig paper-making waste water of waste paper
  • Process for treatnig paper-making waste water of waste paper

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] Such as figure 1 As shown, the entire treatment process of the present invention is as follows: Waste paper and papermaking wastewater enters the regulating pool after removing some impurities through grilles, grids and filters. After the wastewater is balanced in water quality and quantity in the regulating tank, it is pumped to the high-efficiency integrated purifier by the lifting pump, and a certain chemical agent is added. The wastewater and the agent are mixed and reacted in the device, and most of the treated clean water overflows from the upper part of the purifier. It flows to the clear water tank, and a small part enters the biochemical treatment tank (including hydrolytic acidification and contact oxidation), and then it is discharged after secondary sedimentation in the secondary sedimentation tank. The suspended matter that sinks from the...

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Abstract

The treating process of waste water produced in making paper with waste paper includes the first stage of physical and chemical treatment with the apparatus of patent ZL 97114281.5 with aluminum sulfate added to the inlet as coagulant and acrylamide as coagulant aid; and the second stage of biochemical treatment in hydrolysis acidification-contact oxidation technique and perforation and flow dispersing aeration mode, with the waste water from biochemical treatment flowing into the secondary deposition pond. Of water after the first stage of treatment, 60-80 % is used as intermediate water returned to work shop, while other flows into the second stage of treatment for reuse in production or exhaust. The sludge from the first stage of treatment is treated in jigging sieve before reuse in production. The present invention may realize the closed circular use of paper-making waste water to reduce waste water exhaust.

Description

(1) Technical field [0001] The invention relates to sewage treatment technology, in particular to a closed cycle treatment method for waste paper and papermaking wastewater. (2) Background technology [0002] The paper industry has always been the main source of industrial pollution in my country, and the pollution caused by its wastewater accounts for one-third of all industrial wastewater pollution. Since the 1990s, due to the pressure of environmental pollution and ecological protection, the raw material structure of my country's paper industry has been greatly adjusted. Many enterprises have stopped making pulp and used waste paper as raw material to produce recycled paper. The reuse of plant fiber resources can also reduce the serious pollution caused by the direct use of plant raw materials for pulping. Waste paper and papermaking wastewater discharge mainly comes from processes such as washing, screening, concentration, and paper machine white water. The characteristi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F3/12
CPCY02W10/10
Inventor 万金泉马邕文
Owner SOUTH CHINA UNIV OF TECH
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