A Quantitative Method for Adding Chemical Reagents to Improve the Dewaterability of Old Sludge

A technology of chemical reagents and quantitative methods, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve poor dehydration effect, increased economic cost, inaccurate calculation of chemical reagent usage, etc. problem, to achieve the effect of expanding the scope of application, improving efficiency, saving time and workload

Active Publication Date: 2022-04-08
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to make up for the deficiencies in the prior art, the present invention provides a quantitative method for adding chemical reagents to improve the dehydration of old sludge, which can solve the problem of inaccurate calculation of the appropriate amount of chemical reagents used in old sludge and avoid insufficient reagent addition or waste, resulting in poor dehydration effect or invalid increase of economic cost

Method used

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  • A Quantitative Method for Adding Chemical Reagents to Improve the Dewaterability of Old Sludge
  • A Quantitative Method for Adding Chemical Reagents to Improve the Dewaterability of Old Sludge
  • A Quantitative Method for Adding Chemical Reagents to Improve the Dewaterability of Old Sludge

Examples

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Effect test

Embodiment 1

[0046] This example is a quantification method that uses the rheological parameters of old sludge as the benchmark for reagent addition. Under the condition of improving the specific resistance of old mud to the same degree, the content of organic matter and dry basis content alone are used as the benchmark for reagent addition. For comparison, the steps are as follows:

[0047] S1: Select five kinds of old municipal sludge No.1, No.5, No.2, No.8, and No.3 as objects, and the moisture content of the original samples collected are: 75.71±0.58%, 84.53±0.35%, 89.46 ±0.27%, 76.24±0.67%, 83.25±0.35%. The original sludge is stirred with water, and resuspended into a pumpable fluid state whose water content accounts for 93.16±0.14% of the total mass of the mud. Carry out the shear rheological test of the old sludge suspension to obtain the yield stress τ of the suspension y Values, the rheological parameters were tested in triplicate to take the average value; see Table 1.

[0048...

Embodiment 2

[0059] This embodiment is based on the yield stress of the old sludge suspension as the standard quantification method for reagent addition. When dealing with old sludge with different physical and chemical properties, the influence of the previous response surface test procedure on the prediction of reagent dosage is considered. The steps are as follows:

[0060] S1: Select five kinds of old municipal sludge No.1, No.5, No.2, No.8, No.3 as the object, add water to the original sludge and stir, and resuspend so that the water content accounts for the total mass of the sludge is 93.16± 0.14% pumpable flow state slurry. Carry out the shear rheological test of the old sludge suspension to obtain the yield stress τ of the suspension y The rheological parameters were tested in triplicate and averaged. See Table 1.

[0061] S2: Conduct response surface tests on chemical conditioning and filtration of No.1, No.5, No.2, No.8, No.3 old sludge. After setting the chemical conditioning...

Embodiment 3

[0071] This example is a quantification method using the rheological parameters of the old sludge slurry as the benchmark for the amount of reagents added to treat old sludge with similar physical and chemical properties, and to obtain the effect verification of the amount of reagents added to treat old sludge. The steps are as follows:

[0072] S1: Select obsolete municipal sludge A1 and A2 objects, and the water content of collected raw sludge is 83.21±0.38% and 84.57±0.29%, respectively. The original sludge is stirred with water, and resuspended into a pumpable fluid state whose water content accounts for 93.16±0.14% of the total mass of the mud. Carry out the shear rheological test of the old sludge suspension, and take the average value of the test in triplicate to obtain the yield stress τ of the suspension y It is 1.52±0.13Pa and 1.47±0.15Pa.

[0073] S2: Carry out the chemical conditioning filtration and response surface test of A1 old sludge. After setting the chemi...

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Abstract

The invention discloses a quantitative method for adding chemical reagents to improve the dehydration of old sludge, which comprises the following steps: 1) stirring at least one kind of old sludge with water, and performing a steady-state rheological shear test on the slurry after resuspension, And Herschel-Bulkley equation fitting is performed on the rheological curve data to obtain the yield stress τ of different muds y 2) Conduct chemical conditioning and filtration response surface tests of at least one kind of old sludge, and search for the optimal addition mass combination of mud chemical reagents through tests and analysis; 3) Convert the optimal addition mass of the reagents found in step 2) to get Mud tau y The normalized value corresponding to the value, or the optimized addition mass of the reagent and the corresponding mud τ y The values ​​were subjected to least squares linear regression. Other old sludge is processed and tested according to step 1), and the weight of reagents added to other old sludge is calculated by using the obtained normalized value or linear regression equation. The invention can adapt to various complex old sludge chemical oxidation conditioning.

Description

technical field [0001] The invention relates to the technical field of environmental geotechnical engineering, in particular to a quantitative method for adding chemical reagents to improve the dewaterability of old sludge. Background technique [0002] Sanitary landfill is the main disposal method for excess sludge in sewage treatment plants in my country, and landfill disposal accounted for 60% of the total in the past. Although the surplus sludge with increasing output has been dehydrated and landfilled hygienically, land resources are limited, and the landfill still occupies a large amount of precious land resources. The ecological, industrial and commercial environments around the landfill are greatly affected, especially in the Areas with high ecological environment requirements and relatively scarce land resources. Therefore, in order to improve the capacity of landfills and repair irregular and obsolete landfill pits, it is of great significance to explore the secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/143G06F17/11
CPCC02F11/14C02F2209/09
Inventor 谭洵陈亿军何星星惠心敏喃王平张少华李源
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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