A method for thickening sludge in a convection flow primary sedimentation tank

A primary sedimentation tank, advection technology, applied in chemical instruments and methods, water/sludge/sewage treatment, dewatering/drying/concentrated sludge treatment, etc. The problems of filtration specific resistance value and sludge moisture difficulty can achieve the effects of low cost, increased concentration rate, and reduced pressure filtration load and difficulty.

Active Publication Date: 2017-01-25
GUIZHOU ANKAIDA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The generated sludge poses a serious problem to the sewage treatment plant. The reason is that the sludge produced in the sewage treatment process has a high water content, a large volume, and it is difficult to remove the water; while the traditional sewage treatment The treatment of the sludge is composting, incineration, landfill and other technical means, but these technical means are difficult to meet the requirements of GB / T23485-2009 for sludge moisture content
[0003] At the same time, the water contained in the sludge can be divided into four types: surface adsorption water, interstitial water, capillary bound water, and internal bound water; and the sludge is composed of flocculent colloids. When an external force is applied, the colloidal fine particles It will block and form a filter bridge, which increases the specific resistance value of the filter; it is difficult to remove the water in the sludge mechanically (such as centrifugally), and the removal rate is low, which in turn causes the water content in the sludge to be high; and, In the sludge produced during the sewage treatment process, there are still a large amount of organic substances, biotoxic pollutants and other substances that seriously affect the environmental quality, which leads to composting, incineration or Landfill and other means of treatment will bring serious pollution to the environment; therefore, we urgently need to find a sludge reduction method that can degrade organic substances, biotoxic pollutants and avoid colloidal fine particles from forming a filter bridge. Approach

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for concentrating sludge in an advection primary sedimentation tank, comprising the following steps:

[0017] (1) Discharge the sewage into the advection primary sedimentation tank, and add iron powder accounting for 1% of the sewage weight according to the amount of sewage, and make it in the advection primary sedimentation tank with a stirring speed of 200r / min for 2 hours. , then add carbon powder accounting for 2% of the sewage weight, and use a stirring speed of 1000r / min to stir for 10min, then place it under normal temperature environment, let it stand for 1h, and set it aside;

[0018] (2) Use a gantry crane, and hang a grab bucket on the steel cable of the gantry crane, and drop it into the advection primary settling tank through the grab bucket, and grab the sludge in the advection primary settling tank and move it to the thickening tank through the grab bucket , and in the process of grabbing sludge, the squeeze force on the grab bucket is 5.7kg / m 2...

Embodiment 2

[0020] A method for concentrating sludge in an advection primary sedimentation tank, comprising the following steps:

[0021] (1) Discharge the sewage into the advection primary sedimentation tank, and add iron powder accounting for 5% of the sewage weight according to the amount of sewage, and make it in the advection primary sedimentation tank with a stirring speed of 500r / min for 3 hours. , then add carbon powder accounting for 5% of the sewage weight, and adopt a stirring speed of 2000r / min to stir for 20min, then place it under normal temperature environment, let it stand for 10h, and set it aside;

[0022] (2) Use a gantry crane, and hang a grab bucket on the steel cable of the gantry crane, and drop it into the advection primary settling tank through the grab bucket, and grab the sludge in the advection primary settling tank and move it to the thickening tank through the grab bucket , and in the process of grabbing sludge, the squeeze force on the grab bucket is 6.5kg / m...

Embodiment 3

[0026] A method for concentrating sludge in an advection primary sedimentation tank, comprising the following steps:

[0027] (1) Discharge the sewage into the advection primary sedimentation tank, and add iron powder accounting for 2% of the sewage weight according to the amount of sewage, and make it stir in the advection primary sedimentation tank with a stirring speed of 300r / min for 2.5h Finally, add carbon powder accounting for 3% of the sewage weight to it, and adopt a stirring speed of 1500r / min to stir for 15 minutes, then place it under normal temperature environment, let it stand for 5 hours, and set it aside;

[0028] (2) Use a gantry crane, and hang a grab bucket on the steel cable of the gantry crane, and drop it into the advection primary settling tank through the grab bucket, and grab the sludge in the advection primary settling tank and move it to the thickening tank through the grab bucket , and in the process of grabbing sludge, the squeeze force on the grab...

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PUM

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Abstract

The invention relates to the technical field of sludge dehydrating treatment, and especially relates to a method for concentrating horizontal-flow primary sedimentation tank sludge. sewage is sent to a horizontal-flow primary sedimentation tank, iron powder and powdered carbon are added in the horizontal-flow primary sedimentation tank, iron powder and powdered carbon form microelectrolysis in the horizontal-flow primary sedimentation tank, sewage is mixed with iron powder and powdered carbon and stirred for stirring processing, the iron powder is uniformly mixed with the powdered carbon in the horizontal-flow primary sedimentation tank, microbattery formed by the iron powder and powdered carbon can be distributed on the whole primary sedimentation tank, the organic matter in the sludge and microbe cell wall can be degraded or ruptured under effect of microelectrolysis, extruding processing of a gantry crane grab bucket is combined, so that color substance in sewage can be removed, water in the microbe cell wall in the sludge can be dissociated, combination water content in the sludge is reduced, sludge condensation processing difficulty is reduced, sludge dehydration rate is increased, press filtration load and difficulty of a filter press are reduced, and sludge processing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of sludge dehydration treatment, in particular to a method for concentrating sludge in an advection primary sedimentation tank. Background technique [0002] With the acceleration of urbanization and the improvement of people's living standards, the discharge of urban industrial wastewater and domestic sewage is increasing, and the increase in sewage treatment volume and the requirements for advanced sewage treatment will inevitably produce more sludge. The generated sludge poses a serious problem to the sewage treatment plant. The reason is that the sludge produced in the sewage treatment process has a high water content, a large volume, and it is difficult to remove the water; while the traditional sewage treatment The treatment of the after sludge is composting, incineration, landfill and other technical means, but these technical means are difficult to meet the requirements of GB / T23485-2009 for sludge m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F11/12
Inventor 周荣赵德功陈林邓书林赵小龙罗庆军
Owner GUIZHOU ANKAIDA IND
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