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A method for improving the dewatering performance of sludge after hydrolysis and acidification

A technology for hydrolysis, acidification and sludge dewatering, which is applied in water/sludge/sewage treatment, chemical instruments and methods, dehydration/drying/concentrated sludge treatment, etc. problem, to achieve the effect of low cost, wide source, simple and easy to operate method

Active Publication Date: 2020-12-04
SHENZHEN HAIYUAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the problem of sludge dehydration after hydrolysis and acidification cannot be solved effectively and economically, it will seriously restrict the application of excess sludge hydrolysis and acidification for carbon extraction and resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Sludge hydrolysis and acidification. The original sludge (sludge before hydrolysis and acidification) with the suspended solid concentration of the mixed solution at about 33.8g / L and the volatile suspended solids of the mixed solution at 15.1g / L is used for hydrolysis and acidification. The process of hydrolysis and acidification is: 10L original sewage Add 5L of tap water to the mud, then adjust the pH to about 12, heat it to about 70°C, let it stand for 1 hour, cool it and then introduce it into the hydrolysis and acidification device for hydrolysis and acidification. The concentration of suspended solids in the sludge mixture is about 24.5g / L, the volatile suspended solids in the mixture is 8.7g / L, and the pH is about 9.

[0020] (2) Adjust the pH of the sludge. The hydrolyzed and acidified sludge was adjusted to pH 5 with industrial sulfuric acid.

[0021] (3) Add nanometer montmorillonite powder. Add nano-scale montmorillonite powder according to the dosage...

Embodiment 2

[0027] (1) Sludge hydrolysis and acidification. The hydrolysis and acidification process is the same as that in Example 1.

[0028] (2) Adjust the pH of the sludge. The hydrolyzed and acidified sludge was adjusted to pH 5 with industrial sulfuric acid.

[0029] (3) Add nanometer montmorillonite powder. Add nano-scale montmorillonite powder according to the dosage of 8g / L, and stir for 2-3min under the condition of stirring speed of 350r / min.

[0030] (4) Add coagulant. According to the dosage of 7g / L, add ferric chloride hexahydrate powder, and continue to stir for 2-3min at a stirring speed of 350r / min.

[0031] (5) Add coagulant. According to the dosage of 150mL / L, add 0.1% polyacrylamide solution, first stir at a stirring speed of 350r / min for 1min, then stir at a stirring speed of 200r / min for 2min, and finally stir at a stirring speed of 50r / min 2min.

[0032] (6) Press filter dehydration. After the stirring is completed, the conditioned sludge is poured into a pr...

Embodiment 3

[0035] (1) Sludge hydrolysis and acidification. The hydrolysis and acidification process is the same as that in Example 1.

[0036] (2) Adjust the pH of the sludge. The hydrolyzed and acidified sludge was adjusted to pH 5 with industrial sulfuric acid.

[0037] (3) Add nanometer montmorillonite powder. Add nano-scale montmorillonite powder according to the dosage of 8g / L, and stir for 2-3min under the condition of stirring speed of 350r / min.

[0038] (4) Add coagulant. According to the dosage of 5g / L, add ferrous sulfate heptahydrate, and continue to stir for 2-3min at a stirring speed of 350r / min.

[0039] (5) Add coagulant. According to the dosage of 150mL / L, add 0.1% polyacrylamide solution, first stir at a stirring speed of 350r / min for 1min, then stir at a stirring speed of 200r / min for 2min, and finally stir at a stirring speed of 50r / min 2min.

[0040] (6) Press filter dehydration. After the stirring is completed, the conditioned sludge is poured into a pressure...

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PUM

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Abstract

The invention discloses a method for improving dehydration property of sludge after hydrolytic acidification. The method comprises the following steps: adjusting pH of the sludge; adding nanoscale montmorillonite powder; adding a coagulant; adding a coagulant aid; and carrying out pressure filtration dehydration. As the sludge is very difficult to dehydrate after being subjected to the hydrolytic acidification and carbon source extraction, moisture content of the sludge treated by a sludge treatment plant is about 80%, and the sludge after being treated according to the invention and subjected to the hydrolytic acidification is greatly reduced in the moisture content. The method disclosed by the invention has the advantages of low medicament cost, no corrosivity, no toxicity and harm, no extra increase of equipment during dehydration, simple use and operation processes and direct application of the obtained carbon source product, and the obtained carbon source product can be widely applied to a conditioning dehydration technology of the sludge after the hydrolytic acidification.

Description

technical field [0001] The invention relates to a method for improving the dewatering performance of sludge, in particular to a method for improving the dewatering performance of sludge after hydrolysis and acidification. Background technique [0002] With the increasing discharge of domestic sewage, the output of excess sludge in sewage treatment stations is also increasing. How to effectively and economically treat these excess sludge is one of the most important issues faced by the environmental protection industry. On the other hand, the sewage treatment station is also facing the problem of upgrading and upgrading, and strictly control the emission of nitrogen. Combining these two aspects, many researchers have studied the hydrolysis and acidification of excess sludge, and then extract the carbon inside as an additional carbon source to solve the problem of insufficient denitrification carbon source in the biological denitrification process of low-carbon nitrogen ratio ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/121C02F11/147C02F11/143
CPCC02F11/00C02F11/122C02F11/14C02F2303/06
Inventor 陈云雷巫尚文朱能武吴丽颖马伟文尹富华
Owner SHENZHEN HAIYUAN ENERGY TECH CO LTD