CN115140915A - Sludge oxidation and water separation method for dredged slurry - Google Patents

Sludge oxidation and water separation method for dredged slurry Download PDF

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Publication number
CN115140915A
CN115140915A CN202210680735.8A CN202210680735A CN115140915A CN 115140915 A CN115140915 A CN 115140915A CN 202210680735 A CN202210680735 A CN 202210680735A CN 115140915 A CN115140915 A CN 115140915A
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China
Prior art keywords
value
minutes
slurry
mud
stage
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CN202210680735.8A
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Chinese (zh)
Inventor
方申柱
卫邦齐
韩久春
冯景伟
邱征
徐得潜
肖源廷
王静峰
张振华
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Anhui Province Transportation Harbor Engineering Co ltd
Hefei University of Technology
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Anhui Province Transportation Harbor Engineering Co ltd
Hefei University of Technology
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Application filed by Anhui Province Transportation Harbor Engineering Co ltd, Hefei University of Technology filed Critical Anhui Province Transportation Harbor Engineering Co ltd
Priority to CN202210680735.8A priority Critical patent/CN115140915A/en
Publication of CN115140915A publication Critical patent/CN115140915A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/06—Treatment of sludge; Devices therefor by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/007—Contaminated open waterways, rivers, lakes or ponds

Abstract

The invention discloses a method for separating oxidized mud water from dredged mud, which comprises the following steps: s1, adding hydrogen peroxide solution and ferrate into dredging mud in sequence to obtain premixed mud; s2, performing staged stirring on the premixed slurry to obtain uniformly mixed slurry; and S3, standing and precipitating the mixed slurry to realize mud-water separation, and obtaining supernatant and concentrated slurry.

Description

Method for separating oxidized mud and water of dredging mud
Technical Field
The invention relates to the technical field of mud-water separation of dredging mud, in particular to an oxidation mud-water separation method of the dredging mud.
Background
The production of the slurry in the dredging engineering is huge, and the main influence is as follows: (1) poor sense of organ: the dredged mud is black in appearance, and due to internal anaerobic fermentation, odor can be generated when the dredged mud is piled for too long time in a mud piling area, so that mosquitoes can be attracted; (2) occupied land the area is large: the mud has high water content, is rich in organic matters, heavy metals, nitrogen and phosphorus, has poor mud sedimentation performance, is difficult to realize mud-water separation under natural conditions, increases the area of a mud throwing area, and causes the land to be occupied for a long time; (3) the yield of residual water is high: organic matters, nitrogen, phosphorus, heavy metals and other pollutants in the slurry flow into residual water, and the residual water is directly discharged into a receiving water body to easily cause secondary pollution.
If the rapid mud-water separation of the dredged mud can be realized, the volume of the mud can be greatly reduced, a large amount of land resources can be saved, the mud-water separation time of the dredged mud can be greatly shortened, and the construction cost can be obviously reduced. However, the extracellular polymer of the dredging mud has strong water retention capacity and is a key factor for limiting the mud-water separation performance of the dredging mud. The dredging mud has high organic matter content, which results in high capillary water content and extracellular polymer content, and the extracellular polymer has strong water holding capacity and can change the surface charge, hydrophobicity, particle size and other properties of the mud, so as to affect the flocculation performance, precipitation performance, dewatering performance, etc.
Many scholars at home and abroad try to change or destroy extracellular polymeric substances in various ways, destroy the colloid structure of the slurry and release bound water, so as to achieve the purposes of improving the slurry-water separation performance and realizing the rapid slurry-water separation of the dredged slurry. The oxidation treatment is one commonly used method for breaking the slurry extracellular polymer, strong oxidant is added into the dredged slurry to oxidize and break the slurry extracellular polymer and microbial cells, so that the mud-water separation performance of the slurry is improved, and the mud-water separation time of the dredged slurry is greatly shortened. The oxidizing agents commonly used in oxidation treatments, such as potassium permanganate, require a prior adjustment of the pH of the dredging slurry prior to oxidation.
Disclosure of Invention
In view of the above, the present invention provides a method for separating oxidized sludge and water from dredging mud, so as to solve the problems in the background art, ferrate and hydrogen peroxide are used as oxidation treatment agents, the pH value of the dredging mud does not need to be adjusted before oxidation treatment, and the sludge and water separation time of the dredging mud can be greatly shortened.
In order to achieve the purpose, the invention provides the following technical scheme:
an oxidation mud-water separation method for dredged mud comprises the following steps:
s1, adding hydrogen peroxide solution and ferrate into dredged slurry in sequence to obtain premixed slurry;
s2, performing staged stirring on the premixed slurry to obtain uniformly mixed slurry; the staged agitation comprises:
stirring in the first stage: g value is 85-110s -1 GT value is 2900-3100;
stirring in the second stage: g value is 20-40s -1 GT value is 4300-4700;
stirring in the third stage: g value is 5-20s -1 GT value is 6800-7600;
s3, standing and precipitating the mixed slurry to realize mud-water separation, and obtaining supernatant and concentrated slurry.
As a further scheme of the invention: the ferrate is at least one of potassium ferrate or sodium ferrate and is in the form of solid particles. Ferrate is a strong oxidant, can oxidize most organic matters, has selectivity and oxidation capacity higher than that of potassium permanganate, and has standard electrode potential of 2.20V under acidic condition. Meanwhile, the reaction product is ferric hydroxide which is in a colloidal state in the solution and can remove suspended matters in water by coagulation. The hydrogen peroxide strengthened ferrate system has stronger oxidation capacity, and can induce to generate high-activity components such as hydroxyl free radicals and the like in a solution besides the advantages. The ferrate is adopted to be cooperated with the hydrogen peroxide to treat the dredging mud, extracellular polymers of the dredging mud are broken, the mud-water separation time of the dredging mud is greatly shortened, and the rapid mud-water separation of the dredging mud is realized.
As a further scheme of the invention: the dosage of the ferrate is 0.5-15mmol/L.
As a further scheme of the invention: according to [ H ] 2 O 2 ]/[Fe(VI)]The adding amount of the hydrogen peroxide is 0.5-30 in terms of molar ratio.
As a further scheme of the invention: the concentration of the hydrogen peroxide solution is 25-35%.
As a further scheme of the invention: the G value of the first-stage stirring is preferably 90 to 105s -1 GT value is preferably 2950 to 3050.
As a further scheme of the invention: the value G for the second-stage stirring is preferably 25 to 35s -1 The GT value is preferably 4400-4600.
As a further scheme of the invention: the G value of the stirring in the third stage is preferably 10 to 15s -1 The GT value is preferably 7000-7400.
Compared with the prior art, the invention has the beneficial effects that:
(1) The ferrate and the hydrogen peroxide have strong oxidizing capability, the standard oxidation-reduction potential of the ferrate and the hydrogen peroxide is as high as 2.20V under an acidic condition, inorganic and organic pollutants can be oxidized and degraded, and multiple functions like Fenton reagent, flocculation precipitation and the like can be exerted. When the method is used for the oxidation of the dredged mud, the mud-water separation performance of the mud can be obviously improved, the earlier stage mud-water separation speed is accelerated, and the mud-water separation time is shortened.
(2) The reaction of the method is carried out at normal temperature and normal pressure, the reaction conditions are not harsh, the adding amount of ferrate and hydrogen peroxide can be adjusted according to the characteristics of the water content, the inorganic matter content, the organic matter content and the like of the dredged slurry, the mud-water separation effect of the slurry is controlled by adjusting the stirring intensity and the stirring time, and the operation is simple and convenient.
(3) The method has simple operation procedure, and the preparation and adding method of the medicament is simple and easy to operate.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Any range recited herein is intended to include the endpoints and any number between the endpoints and any subrange subsumed therein or defined therein.
The following examples and comparative examples used the same dredging slurry source and had a water content of 90%. The three-stage stirring is performed by adopting a paddle type mechanical stirring device so as to control the stirring speed and the stirring time. Recording the volume of the slurry and the turbidity of the supernatant at different times after the stirring is finished, calculating the suspended matter concentration of the supernatant according to the correlation between the turbidity and the suspended matters, and calculating the volume reduction rate of the dredged slurry and the suspended matter concentration of the supernatant. Wherein, the suspended matter concentration of the supernatant is measured by adopting a gravimetric method, and the turbidity of the supernatant is measured by adopting a photoelectric turbidity meter; and (3) establishing a linear regression equation of the suspended matter concentration and turbidity value of the supernatant by adopting a least square method: supernatant suspension concentration =2.6488 × turbidity. The lower the concentration and the lower the turbidity of suspended matters in the supernatant, the better the separation effect is; in the same time, the larger the reduction rate of the slurry volume is, the better the reduction rate is; the faster the mud volume reduction earlier the better.
Example 1
Adopting potassium ferrate and hydrogen peroxide to carry out synergistic treatment on dredging mud with the water content of 90 percent, adding 2.5mmol/L of potassium ferrate, and adding the following components in percentage by weight: [ H ] 2 O 2 ]And [ Fe (VI)]The molar ratio is 1:1. mixing and reacting the medicament and the slurry by adopting a three-stage stirring mode, wherein the G value and the GT value of the one-stage stirring are respectively 100s -1 And 3000;the G value and GT value of the two-stage stirring were 30s respectively -1 And 4500; g value and GT value of the three-stage stirring are respectively 10s -1 And 7200. When the standing and precipitation time was 2 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes, the slurry volume reduction rates were 17%, 33%, 43%, 53%, 57%, 67%, 68%, 70%, 77%, 83%, 87%, and 87%, respectively. At 60 minutes of settling time, the turbidity value and the suspended matter concentration of the treated slurry supernatant were 82NTU and 216mg/L, respectively.
Example 2
Adopting potassium ferrate and hydrogen peroxide to carry out synergistic treatment on dredging mud with the water content of 90 percent, adding 2.5mmol/L of potassium ferrate, and adding the following components in percentage by weight: [ H ] 2 O 2 ]And [ Fe (VI)]The molar ratio is 10:1. mixing and reacting the medicament and the slurry by adopting a three-stage stirring mode, wherein the G value and the GT value of the one-stage stirring are respectively 100s -1 And 3000; the G value and GT value of the two-stage stirring were 30s respectively -1 And 4500; g value and GT value of the three-stage stirring are respectively 10s -1 And 7200. When the standing and precipitation time was 2 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes, the slurry volume reduction rates were 10%, 12%, 17%, 18%, 20%, 22%, 27%, 37%, 40%, 50%, 67%, and 73%, respectively. At a standing and settling time of 60 minutes, the turbidity value and suspended matter concentration of the treated slurry supernatant were 403NTU and 1067mg/L, respectively.
Example 3
Adopting potassium ferrate and hydrogen peroxide to carry out synergistic treatment on dredging mud with the water content of 90 percent, adding 2.5mmol/L of potassium ferrate, and adding the following components in percentage by weight: [ H ] 2 O 2 ]And [ Fe (VI)]The molar ratio is 20:1. mixing and reacting the medicament and the slurry by adopting a three-stage stirring mode, wherein the G value and the GT value of the one-stage stirring are respectively 100s -1 And 3000; the G value and GT value of the two-stage stirring were 30s respectively -1 And 4500; g value and GT value of three-stage stirringIs 10s -1 And 7200. When the standing and precipitation time was 2 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes, the slurry volume reduction rate was 1%, 2%, 3%, 5%, 7%, 17%, 67%, 70%, and 73%, respectively. At 60 minutes settling time, the turbidity value and suspended matter concentration of the treated slurry supernatant were 1204NTU and 3189mg/L, respectively.
Example 4
Adopting potassium ferrate and hydrogen peroxide to carry out synergistic treatment on dredging mud with the water content of 90 percent, adding 2.5mmol/L of potassium ferrate, and adding the following components in percentage by weight: [ H ] 2 O 2 ]And [ Fe (VI)]The molar ratio is 30:1. mixing and reacting the medicament and the slurry by adopting a three-stage stirring mode, wherein the G value and the GT value of the one-stage stirring are respectively 100s -1 And 3000; the G value and GT value of the two-stage stirring were 30s respectively -1 And 4500; g value and GT value of the three-stage stirring are respectively 10s -1 And 7200. When the standing and precipitation time was 2 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes, the slurry volume reduction rate was 0%, 2%, 3%, 5%, 13%, 50%, 67%, 68%, and 80%, respectively. At 60 minutes settling time, the turbidity value and suspended matter concentration of the treated slurry supernatant were 966NTU and 2559mg/L, respectively.
Comparative example 1
Separately treating dredging mud with water content of 90% with potassium ferrate, adding potassium ferrate (dosage is 1.25 mmol/L), mixing and reacting the agent and the mud with three-stage stirring, wherein G value and GT value of the one-stage stirring are respectively 100s -1 And 3000; the G value and GT value of the two-stage stirring were 30s respectively -1 And 4500; g value and GT value of the three-stage stirring are respectively 10s -1 And 7200. The slurry volume at a standing precipitation time of 2 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutesThe reduction ratios were 10%, 13%, 17%, 23%, 25%, 30%, 33%, 38%, 47%, 57%, 65%, and 67%, respectively. At a standing and settling time of 60 minutes, the turbidity value and suspended matter concentration of the treated mud supernatant were 328NTU and 869mg/L, respectively.
Comparative example 2
Separately treating dredging mud with water content of 90% with potassium ferrate, adding potassium ferrate (dosage is 2.5 mmol/L), mixing and reacting the agent and the mud with three-stage stirring, wherein G value and GT value of the one-stage stirring are respectively 100s -1 And 3000; the G value and GT value of the two-stage stirring were 30s respectively -1 And 4500; g value and GT value of the three-stage stirring are respectively 10s -1 And 7200. When the standing and settling time was 2 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes, the slurry volume reduction rates were 13%, 18%, 22%, 30%, 33%, 37%, 47%, 52%, 60%, 67%, 68%, and 70%, respectively. At 60 minutes settling time, the turbidity value and suspension concentration of the treated slurry supernatant were 162NTU and 429mg/L, respectively.
Comparative example 3
Treating dredging slurry with water content of 90% with potassium ferrate, adding potassium ferrate (dosage is 5 mmol/L), mixing and reacting the agent and slurry with three-stage stirring, wherein G value and GT value of one-stage stirring are 100s respectively -1 And 3000; the G value and GT value of the two-stage stirring were respectively 30s -1 And 4500; g value and GT value of the three-stage stirring are respectively 10s -1 And 7200. When the standing and precipitation time was 2 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes, the slurry volume reduction rates were 15%, 20%, 25%, 33%, 35%, 40%, 47%, 50%, 57%, 67%, 70%, 72%, and 73%, respectively. At 60 minutes settling time, the turbidity value and suspension concentration of the treated mud supernatant were 174NTU and 462mg/L, respectively.
Comparative example 4
The dredged slurry with the water content of 90 percent is independently treated by hydrogen peroxide, and the dosage of the added hydrogen peroxide is 2.5mmol/L. Mixing and reacting the medicament and the slurry by adopting a three-stage stirring mode, wherein the G value and the GT value of the one-stage stirring are respectively 100s -1 And 3000; the G value and GT value of the two-stage stirring were 30s respectively -1 And 4500; g value and GT value of the three-stage stirring are respectively 10s -1 And 7200. When the standing and settling time was 2 minutes, 4 minutes, 6 minutes, 8 minutes, 10 minutes, 12 minutes, 14 minutes, 16 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes, the slurry volume reduction rates were 5%, 7%, 10%, 11%, 13%, 14%, 15%, 16%, 17%, 20%, and 27%, respectively. At 60 minutes of settling time, the turbidity value and suspended matter concentration of the treated slurry supernatant were 2090NTU and 5536mg/L, respectively.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all the equivalent changes made within the scope of the claims of the present application are the protection scope of the claims of the present application.

Claims (8)

1. The method for separating the oxidized sludge and water of the dredged mud is characterized by comprising the following steps of:
s1, adding hydrogen peroxide solution and ferrate into dredged slurry in sequence to obtain premixed slurry;
s2, carrying out stage-type stirring on the premixed slurry to obtain uniformly-mixed slurry; the staged agitation comprises:
stirring in the first stage: g value is 85-110s -1 GT value is 2900-3100;
stirring in the second stage: g value is 20-40s -1 GT value is 4300-4700;
stirring in the third stage: g value is 5-20s -1 GT value is 6800-7600;
s3, standing and precipitating the mixed slurry to realize mud-water separation, and obtaining supernatant and concentrated slurry.
2. The treatment method of claim 1, wherein the ferrate is at least one of potassium ferrate or sodium ferrate.
3. The treatment method according to claim 1, wherein the ferrate is added in an amount of 0.5 to 15mmol/L.
4. The process according to claim 1, characterized by the fact that it is according to [ H ] 2 O 2 ]/[Fe(VI)]The adding amount of the hydrogen peroxide is 0.5-30 in terms of molar ratio.
5. The treatment process according to claim 1, wherein the concentration of the aqueous hydrogen peroxide solution is 25 to 35%.
6. The process of claim 1, wherein the first stage agitation has a G value of 90 to 105s -1 GT is 2950-3050.
7. The process of claim 1, wherein the second stage agitation has a G value of 25 to 35s -1 The GT value was 4400-4600.
8. The process of claim 1, wherein the third stage agitation has a G value of 10 to 15s -1 GT value is 7000-7400.
CN202210680735.8A 2022-06-16 2022-06-16 Sludge oxidation and water separation method for dredged slurry Pending CN115140915A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080230484A1 (en) * 2007-02-16 2008-09-25 Burnham Jeffrey C Process for treating sludge and manufacturing bioorganically-augmented high nitrogen-containing inorganic fertilizer
CN103524017A (en) * 2013-10-23 2014-01-22 中国海洋石油总公司 Compound gel breaker for processing abandoned drilling mud at sea
CN104891779A (en) * 2015-06-29 2015-09-09 北京工业大学 Combination type efficient sludge dewatering conditioning method
CN104973750A (en) * 2015-06-29 2015-10-14 北京工业大学 Combined conditioning method for sludge high-efficient dehydration
CN113929236A (en) * 2021-11-12 2022-01-14 河南省科学院化学研究所有限公司 Cord fabric gum dipping waste liquid treatment and sludge resource utilization method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080230484A1 (en) * 2007-02-16 2008-09-25 Burnham Jeffrey C Process for treating sludge and manufacturing bioorganically-augmented high nitrogen-containing inorganic fertilizer
CN103524017A (en) * 2013-10-23 2014-01-22 中国海洋石油总公司 Compound gel breaker for processing abandoned drilling mud at sea
CN104891779A (en) * 2015-06-29 2015-09-09 北京工业大学 Combination type efficient sludge dewatering conditioning method
CN104973750A (en) * 2015-06-29 2015-10-14 北京工业大学 Combined conditioning method for sludge high-efficient dehydration
CN113929236A (en) * 2021-11-12 2022-01-14 河南省科学院化学研究所有限公司 Cord fabric gum dipping waste liquid treatment and sludge resource utilization method

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