Curing process for municipal dewatered sludge

A technology of dewatering sludge and solidification process, which is applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc. It can solve the problems of increasing landfill volume, adding more curing agent, and occupying a large area. problem, to achieve the effect of less curing agent dosage, good curing effect and small volume expansion

Pending Publication Date: 2022-07-08
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing problem of cement-based curing is that too much curing agent is added, which increases the landfill volume; the high water content and high organic quality in the sludge affect the cement hydration reaction; the time for curing to reach a certain strength is long, which makes the Large area

Method used

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  • Curing process for municipal dewatered sludge
  • Curing process for municipal dewatered sludge
  • Curing process for municipal dewatered sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) First put 1.6kg of wet sludge (80% moisture content) into the stirring pot and stir it evenly;

[0031] (2) Prepare a certain quality of cellulase, lipase, and protease, mix them with equal quality, and weigh 3% of the composite enzyme according to the weight of the wet sludge;

[0032] (3) Prepare the complexing agent citric acid granules, and weigh 0.5% of citric acid according to the weight of the wet sludge;

[0033] (4) Mix the compound enzyme in (2) and the citric acid in (3) evenly;

[0034] (5) Put the mixture of (4) into the sludge of (1) through the funnel, stir once automatically, then slowly stir for 5 minutes, and stir quickly for 5 minutes;

[0035] (6) Put the agitated sludge in (5) into a conical flask, at 40°C, 200r·min -1 Oscillation treatment for 120h;

[0036] (7) After the enzymatic hydrolysis is completed, take out the sludge in (6), weigh out the sludge mass, and put it into the stirring pot to stir evenly;

[0037] (8) Weigh 3% potassium ...

Embodiment 2

[0047] (1) First put 1.6kg of wet sludge (80% moisture content) into the stirring pot and stir it evenly;

[0048] (2) Prepare a certain quality of cellulase, lipase, and protease, mix them with equal quality, and weigh 3% of the composite enzyme according to the weight of the wet sludge;

[0049] (3) Prepare the complexing agent citric acid granules, and weigh 0.5% citric acid according to the weight of the wet sludge;

[0050] (4) Mix the compound enzyme in (2) and the citric acid in (3) evenly;

[0051] (5) Put the mixture of (4) into the sludge of (1) through the funnel, stir once automatically, stir slowly for 5 minutes, and stir quickly for 5 minutes;

[0052] (6) Put the agitated sludge in (5) into a conical flask, at 40°C, 200r·min -1 Oscillation treatment for 120h;

[0053](7) After the enzymatic hydrolysis is completed, take out the sludge in (6), weigh out the sludge mass, and put it into the stirring pot to stir evenly;

[0054] (8) Weigh 4% potassium ferrate p...

Embodiment 3

[0063] (1) First put 1.6kg of wet sludge (80% moisture content) into the stirring pot and stir it evenly;

[0064] (2) Prepare a certain quality of cellulase, lipase, and protease, mix them with equal quality, and weigh 3% of the composite enzyme according to the weight of the wet sludge;

[0065] (3) Prepare the complexing agent citric acid granules, and weigh 1% of citric acid according to the weight of the wet sludge;

[0066] (4) Mix the compound enzyme in (2) and the citric acid in (3) evenly;

[0067] (5) Put the mixture of (4) into the sludge of (1) through the funnel, stir once automatically, then slowly stir for 5 minutes, and stir quickly for 5 minutes;

[0068] (6) Put the agitated sludge in (5) into a conical flask, at 40°C, 200r·min -1 Oscillation treatment for 120h;

[0069] (7) After the enzymatic hydrolysis is completed, take out the sludge in (6), weigh out the sludge mass, and put it into the stirring pot to stir evenly;

[0070] (8) Weigh 3% potassium fe...

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Abstract

The invention discloses a municipal dewatered sludge solidification process method, which comprises two steps of pretreating and decomposing sludge organic matters and solidifying the sludge, and specifically comprises the following steps: firstly, adding 1-5% of compound enzyme and 0.1-3% of complexing agent into the sludge for enzymolysis treatment, decomposing organic matter macromolecules in the sludge into micromolecules, and releasing part of bound water; then 1%-10% of potassium ferrate is used for oxidation treatment; and uniformly mixing the pretreated sludge with 10% of cement, putting the mixture into a mold, curing until the corresponding age, and testing the strength and the water content of the mixture by 7D to meet the landfill requirements. According to the method, enzymolysis and potassium ferrate oxidation are used as pretreatment of the sludge, so that the influence of organic matters on cement hydration reaction is reduced, and the strength of a solidified body is improved. Meanwhile, the cement curing agent has the advantages of small mixing amount, quick hardening and early strength of a formed cured body and good curing effect.

Description

technical field [0001] The invention relates to sludge treatment, belongs to the field of environmental protection, and in particular relates to a municipal dewatering sludge solidification process. Background technique [0002] In recent years, with the rapid development of urbanization, the popularity of sewage treatment plants is high, and the effect of sewage treatment and treatment capacity has been significantly improved. The sludge composition is very complex, consisting of some organic matter, pathogenic microorganisms, and heavy metals. It has the characteristics of high moisture content, foul smell, high organic matter content and many toxic and harmful substances. Therefore, when the sludge is not treated in time, it is bound to have a significant impact on the soil, atmosphere, water source and human health. [0003] At present, the treatment and disposal methods of sludge mainly include sanitary landfill, land use, incineration, building materials utilization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/148
CPCC02F11/008C02F11/148Y02W30/30
Inventor 杨期勇徐卫鑫熊厚锋黄南婷曾明张新华
Owner JIUJIANG UNIVERSITY
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