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Method for handling waste water of paper making industry

A treatment method and technology for papermaking wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Water quality exceeds the standard and other problems, to achieve good sedimentation, water quality stability, control the effect of sludge bulking

Inactive Publication Date: 2003-07-23
WUXI LONGCHEN GREENTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the above-mentioned technological process is used to treat wastewater, in the summer high temperature season, a large number of filamentous bacteria proliferate, the sludge settling performance in the aeration tank is poor, the sludge settling ratio SV is as high as more than 95%, and serious sludge swelling occurs in the aeration tank, and the sludge The expansion lasts for a long time and is difficult to control, resulting in the water quality exceeding the standard

Method used

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  • Method for handling waste water of paper making industry

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Effect test

Embodiment 1

[0013] Process flow of the present invention is as follows:

[0014] In the invention, the waste water from pulping and paper making is transported to the waste water treatment plant through pipelines, and firstly passes through a sewage blocker, and then filters and removes some large sundries with a filter screen. The filtered wastewater enters the primary sedimentation tank, and a flocculation cabin is placed in the center of the primary sedimentation tank. There are two agitators in the cabin for continuous stirring to produce mechanical flocculation. After the wastewater enters the flocculation cabin and is stirred, it is flocculated by gravity. The tank flows into the sedimentation body of the primary sedimentation tank for settlement. The temperature of the outlet water in the primary sedimentation tank must be controlled at 15-35°C. If the water temperature exceeds 35°C, in order to avoid the death of bacteria in the aeration tank, the cooling tower must be turned on to...

Embodiment 2

[0016] Adopt the technical process in the embodiment 1 of the present invention to treat wastewater, when the concentration of floating water is 10%, the amount of floating water added is: 0.0012% (percentage by weight), and the metering pump is used to continuously add it to the return sludge tank of the middle sedimentation tank . The sludge settlement ratio SV can be controlled below 75% (the original process treats wastewater, SV reaches 98%), the COD of the effluent drops to 96mg / l (the original process treats the wastewater, and its effluent COD is 128mg / 1), and the sludge settles The performance is good, and no sludge bulking phenomenon occurs.

Embodiment 3

[0018] The present invention adopts the technological process in embodiment 1, 2 to process waste water, and the concentration of bleaching water is: 12%, and its adding amount of bleaching water is: 0.0015% (percentage by weight). The wastewater treated by the aeration tank is continuously added to the return sludge tank of the intermediate sedimentation tank by a metering pump. The sludge sedimentation ratio SV can also be controlled at 75%, and the effluent COD can be controlled at 96mg / 1. The sludge sedimentation performance is good, and the same Sludge bulking did not occur.

[0019] The bleaching water (chemical name: sodium hypochlorite) that adopts among the present invention is purchased in the market.

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Abstract

A process for treating paper-making sewage includes filtering primary deposition in initial deposition pool, discharging the sludge in mixing tank, flowing sewage in aerating pool, flowing in reflux sludge tank of middle deposition pool, adding bleaching water for killing bacteria, depositing in middle depositing pool and then in final depositing pool, pumping sludge back to sludge concentrating pool, and draining clean water. It has high effect on decreasing COD to 96 mg / L.

Description

Technical field: [0001] The invention relates to a papermaking wastewater treatment method, which belongs to the technical field of sewage treatment. technical background: [0002] Before the present invention was made, the usual waste water treatment was to transport the waste water from pulping and papermaking to the waste water treatment plant through pipelines, first pass through the sewage catcher, and remove some large sundries by filtering with a filter screen. The filtered wastewater enters the primary sedimentation tank, and a flocculation cabin is placed in the center of the primary sedimentation tank. There are two agitators in the cabin for continuous stirring to produce mechanical flocculation. After the wastewater enters the flocculation cabin and is stirred, it is flocculated by gravity. The sedimentation body that flows into the primary settling tank from the cabin is settled, and the outlet water temperature of the primary settling tank must be controlled at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F9/14
Inventor 陈丰裕韩建时吴卫君
Owner WUXI LONGCHEN GREENTECH CO LTD
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