CN111661993A - Sludge curing agent and preparation method and use method thereof - Google Patents
Sludge curing agent and preparation method and use method thereof Download PDFInfo
- Publication number
- CN111661993A CN111661993A CN201910168774.8A CN201910168774A CN111661993A CN 111661993 A CN111661993 A CN 111661993A CN 201910168774 A CN201910168774 A CN 201910168774A CN 111661993 A CN111661993 A CN 111661993A
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- Prior art keywords
- sludge
- curing agent
- dolomite
- parts
- powder
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Classifications
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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
- C02F11/12—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
-
- 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
- C02F11/008—Sludge treatment by fixation or solidification
Abstract
The application discloses a sludge curing agent and a preparation method and a use method thereof. The raw material of the sludge curing agent comprises dolomite powder, wherein the dolomite powder is obtained by calcining dolomite and then grinding the calcined dolomite into powder. The application also provides a preparation method of the sludge curing agent, which comprises the following steps: and (3) calcining: calcining dolomite; grinding: and grinding the calcined dolomite into powder to obtain the sludge curing agent. The application also provides a using method of the sludge curing agent, wherein the sludge curing agent accounting for 5% -10% of the total amount of the sludge is added into the sludge, and the sludge is uniformly stirred and then cured to enable the sludge to meet the landfill requirement. The application solves the technical problems of large dosage of the sludge curing agent, low curing efficiency, high leaching rate after curing and environmental pollution in the prior art.
Description
Technical Field
The application relates to the technical field of sludge treatment, in particular to a sludge curing agent and a preparation method and a use method thereof.
Background
Sludge treatment is a process of carrying out reduction, stabilization and harmless treatment on sludge. The higher the degree of wastewater treatment, the more sludge residue will be produced to be treated. For modern sewage treatment plants, the treatment and disposal of sludge has become the most complex and costly part of the operation of sewage treatment systems.
The sludge solidification technology is a method for modifying sludge by adding a special solidification material into dewatered sludge of a sewage plant so as to enable the physical property and the chemical property of the sludge to tend to be stable. Solidification refers to a process of changing the physical properties of sludge by increasing the strength of the sludge, decreasing the water permeability. The sludge solidifying agent is a solidifying material added to sludge in the sludge solidifying technology, and can promote the solidification of the sludge so as to enable the sludge to be landfilled, incinerated or reused.
The sludge curing agent in the prior art comprises a lime curing agent, a cement curing agent, a compound curing agent and the like. The main component of the lime curing agent is quicklime, and when the quicklime reacts with water, volcanic ash concrete is generated and used as the sludge curing agent. Such curing agents have the following disadvantages: the input amount is more than 25% (calculated by sludge with water content of 80%), and the cost is high; increasing the weight and volume of the curing agent; the solidified sludge is easy to reduce when meeting water; bad odor is generated during construction; pH > 13. The cement curing agent is an inorganic cementing body and can form a hard solid by reacting with water, thereby realizing the solidification of the sludge. Such curing agents have the following disadvantages: after curing, the volume can be increased by more than 1.5 times, and the influence on the storage capacity is large; the porosity after solidification is high, and the leaching rate of harmful substances in the solidified sludge is high; the input amount is more than 25 percent, and the cost is high; pH > 12. The compound curing agent is prepared by compounding various organic and inorganic substances (aluminum, salt, silicon, iron, magnesium, calcium, furnace slag) and the like, and achieves the purpose of the sludge curing agent by utilizing the characteristics of gel and the like. The curing agent is prepared by compounding a plurality of materials, the preparation process is complex, and the working procedures are various; the raw materials are purchased in a plurality of places, are greatly influenced by market price fluctuation and have high cost.
Aiming at the problems in the prior art, the design of a sludge curing agent which has the advantages of low cost, small input amount, short curing time, environmental friendliness, no secondary pollution and easy sludge treatment after curing becomes a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The main purpose of the application is to provide a sludge curing agent which has the advantages of low cost, less input amount, short curing time, environmental friendliness, no secondary pollution and easy sludge treatment after curing, and the technical problems of large input amount of the sludge curing agent, low curing efficiency, high leaching rate after curing and environmental pollution in the prior art are solved.
In order to achieve the above object, according to a first aspect of the present application, there is provided a sludge solidifying agent, wherein a raw material of the sludge solidifying agent comprises dolomite powder, and the dolomite powder is obtained by grinding calcined dolomite.
Further, the sludge curing agent comprises the following raw material components in parts by weight: 3-5 parts of dolomite powder and 10-15 parts of Portland cement.
Further, the sludge curing agent comprises the following raw material components in parts by weight: 4-6 parts of dolomite powder and 2-6 parts of inorganic matters, wherein the inorganic matters are selected from any one or more of polyaluminium chloride, alumina, magnesium chloride and ferrous sulfate.
In order to achieve the above object, according to a second aspect of the present application, there is provided a method for preparing the above sludge solidifying agent, comprising the steps of: and (3) calcining: calcining dolomite; grinding: and grinding the calcined dolomite into powder to obtain the sludge curing agent.
Further, the temperature of the calcination is 600-1200 ℃.
Further, the calcination time is 3 to 8 hours.
Further, the method also comprises the step of sieving after grinding.
Further, the sieving is 20-120 mesh sieving.
In order to achieve the above purpose, according to a third aspect of the present application, there is provided a method for using the above sludge solidifying agent, wherein the sludge solidifying agent is added to the sludge in an amount of 5% to 10% of the total amount of the sludge, and the mixture is stirred uniformly and then solidified, so that the sludge meets the landfill requirement.
Further, the water content of the sludge is 50-85 wt%.
In the embodiment of the application, the mode of grinding calcined dolomite to obtain dolomite powder is adopted, and the dolomite powder is used as a sludge curing agent to treat sludge, so that the purpose of quickly curing the sludge to meet landfill requirements is achieved, and the technical effects of low cost, small input amount, short curing time, environmental friendliness, no secondary pollution and easiness in sludge treatment after curing of the sludge curing agent are achieved, and the technical problems of large input amount of the sludge curing agent, low curing efficiency, high leaching rate after curing and environmental pollution in the prior art are solved.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the term "comprising" in the description and claims of the present application is intended to cover a non-exclusive inclusion, e.g. a method comprising a list of steps is not necessarily limited to those steps explicitly listed, but may include other steps not explicitly listed or inherent to such methods. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.
Example 1
The sludge curing agent is dolomite powder obtained by calcining and grinding dolomite.
The preparation method of the sludge curing agent comprises the following steps:
and (3) calcining: calcining dolomite at 600 deg.C for 8 hr;
grinding: and grinding the calcined dolomite into powder to obtain the sludge curing agent.
Example 2
The sludge curing agent is dolomite powder obtained by calcining and grinding dolomite.
The preparation method of the sludge curing agent comprises the following steps:
and (3) calcining: calcining dolomite at 1200 deg.C for 3 hr;
grinding: grinding the calcined dolomite into powder to obtain dolomite powder;
sieving: and (3) sieving the ground dolomite powder with a 20-mesh sieve to obtain the sludge curing agent.
Example 3
The sludge curing agent is dolomite powder obtained by calcining and grinding dolomite.
The preparation method of the sludge curing agent comprises the following steps:
and (3) calcining: calcining dolomite at 1000 deg.C for 7 hr;
grinding: grinding the calcined dolomite into powder to obtain dolomite powder;
sieving: and (3) sieving the ground dolomite powder with a 120-mesh sieve to obtain the sludge curing agent.
Example 4
The sludge curing agent comprises the following raw material components in parts by weight: 3 parts of dolomite powder and 10 parts of Portland cement, wherein the dolomite powder is obtained by grinding calcined dolomite.
The preparation method of the sludge curing agent comprises the following steps:
preparing dolomite powder: calcining dolomite at 800 deg.C for 6 hr, grinding, and sieving with 100 mesh sieve to obtain dolomite powder;
preparing a sludge curing agent: and 3 parts of dolomite powder and 10 parts of portland cement are taken to be stirred in a stirrer for 2 hours to obtain the sludge curing agent.
Example 5
The sludge curing agent comprises the following raw material components in parts by weight: 5 parts of dolomite powder and 15 parts of Portland cement, wherein the dolomite powder is obtained by grinding calcined dolomite.
The preparation method of the sludge curing agent comprises the following steps:
preparing dolomite powder: calcining dolomite at 500 deg.C for 4 hr, grinding, and sieving with 80 mesh sieve to obtain dolomite powder;
preparing a sludge curing agent: and (3) stirring 5 parts of dolomite powder and 15 parts of portland cement in a stirrer for 5 hours to obtain the sludge curing agent.
Example 6
The sludge curing agent comprises the following raw material components in parts by weight: 4 parts of dolomite powder and 2 parts of polyaluminium chloride.
The preparation method of the sludge curing agent comprises the following steps:
preparing dolomite powder: calcining dolomite at 1000 deg.C for 5 hr, grinding, and sieving with 80 mesh sieve to obtain dolomite powder;
preparing a sludge curing agent: 4 parts of dolomite powder and 2 parts of polyaluminium chloride are stirred in a stirrer for 5 hours to obtain the sludge curing agent.
Example 7
The sludge curing agent comprises the following raw material components in parts by weight: 6 parts of dolomite powder, 3 parts of aluminum oxide and 3 parts of magnesium chloride.
The preparation method of the sludge curing agent comprises the following steps:
preparing dolomite powder: calcining dolomite at 1000 deg.C for 8 hr, grinding, and sieving with 100 mesh sieve to obtain dolomite powder;
preparing a sludge curing agent: 6 parts of dolomite powder, 3 parts of alumina and 3 parts of magnesium chloride are taken to be stirred in a stirrer for 2.5 hours to obtain the sludge curing agent.
Example 8
The sludge curing agent comprises the following raw material components in parts by weight: 5 parts of dolomite powder, 2 parts of magnesium chloride and 2 parts of ferrous sulfate.
The preparation method of the sludge curing agent comprises the following steps:
preparing dolomite powder: calcining dolomite at 900 deg.C for 7 hr, grinding, and sieving with 120 mesh sieve to obtain dolomite powder;
preparing a sludge curing agent: and (3) stirring 5 parts of dolomite powder, 2 parts of magnesium chloride and 2 parts of ferrous sulfate in a stirrer for 4 hours to obtain the sludge curing agent.
Method for Using sludge curing agent in examples 1 to 8
And adding the sludge curing agent accounting for 5-10% of the total amount of the sludge into the sludge, uniformly stirring and curing to enable the sludge to meet the landfill requirement. The water content in the sludge is 50-85 wt%.
Sludge curing agent performance detection
And (3) putting 10 kg of sludge (with the water content of 80%) into a stirrer, adding 0.5 kg of the sludge curing agent obtained in the example 1, mechanically stirring and uniformly mixing, and stopping stirring after stirring for 1-2 minutes to obtain cured sludge.
(1) The soil mechanical property indexes of the solidified sludge during new solidification and solidification for 1 month, 2 months and 3 months are respectively detected, and the indexes comprise: water content, organic matter, compressive strength and shear strength. The results are shown in Table 1.
TABLE 1 solidified sludge soil mechanical property index detection results
As shown in Table 1, the solidified sludge is stably degraded for 2-3 months, and all detection indexes meet the landfill standard. The organic matter content is obviously reduced, the soil mechanics indexes such as unconfined compressive strength and the like after tamping are also greatly improved, and the subsequent resource utilization is facilitated.
(2) The method is characterized in that the concentration of pollutants in the solidified sludge is detected when the solidified sludge is newly solidified and solidified for 1 month, 2 months and 3 months respectively, and the detection items comprise: total cadmium, total mercury, total lead, total chromium, total arsenic, total nickel, total zinc, total copper, mineral oil, volatile phenol and total cyanide. The results are shown in Table 2.
TABLE 2 solidified sludge contaminant concentration (mg/kg)
As shown in Table 2, all the indexes of the solidified sludge meet the requirements of sludge disposal mixed landfill argillaceous matter of urban sewage treatment plants (CJ/T249-2007).
The sludge curing agent provided in the embodiment of the application has the following advantages:
1. the sludge curing agent and water in the sludge generate hydration reaction to play a role of gelling, and a solidified body with a similar crystalline structure is obtained to achieve the purpose of curing the sludge;
2. the solidification time is short, and the sludge can be solidified to meet the landfill requirement in a short time;
3. the curing agent is environment-friendly, does not cause secondary pollution and is a green curing agent;
4. the solidified sludge has good leaching resistance, prevents the leaching of harmful substances in the harmful sludge, and converts heavy metal pollutants in the sludge into harmless forms by combining partial anions of the curing agent with the heavy metals in the sludge.
5. The sludge can not be loosened and reduced after being soaked in water for a long time, and the curing agent has certain alkalinity and can kill pathogens and bacteria in the sludge.
6. The addition amount is small, 5 to 10 percent (calculated by 80 percent of sludge with water content) has good solidification effect on various sludge, the PH value is less than 9, and simultaneously, the generation of odor can be inhibited.
7. After the solidified sludge is maintained for a period of time and stabilized, a substance similar to soil is formed, the solidified sludge can obtain good strength, can be used as covering soil, backfilling soil and road building, has good effect as power generation auxiliary fuel (containing organic matters) of a garbage power plant and the like, and has certain help to desulfurization due to certain alkalinity.
8. The production process of the sludge curing agent is simple, the plant investment of operating equipment is less, the tissue production is easy, the curing agent is simple and effective to prepare, and the total cost is low.
9. The volume of the solidified sludge can be reduced by less than 50% after a certain period of curing, and the method is particularly important for the utilization of precious land resources.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The sludge curing agent is characterized in that the raw material of the sludge curing agent comprises dolomite powder, and the dolomite powder is obtained by calcining dolomite and then grinding the calcined dolomite into powder.
2. The sludge curing agent as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 3-5 parts of dolomite powder and 10-15 parts of Portland cement.
3. The sludge curing agent as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 4-6 parts of dolomite powder and 2-6 parts of inorganic matters, wherein the inorganic matters are selected from any one or more of polyaluminium chloride, alumina, magnesium chloride and ferrous sulfate.
4. A method for preparing the sludge solidifying agent according to any one of claims 1 to 3, comprising the steps of:
and (3) calcining: calcining dolomite;
grinding: and grinding the calcined dolomite into powder to obtain the sludge curing agent.
5. The method for preparing a sludge curing agent as claimed in claim 4, wherein the temperature of the calcination is 600-1200 ℃.
6. The method for producing a sludge solidifying agent according to claim 4, wherein the calcination is carried out for a period of 3 to 8 hours.
7. The method according to claim 4, further comprising the step of grinding and sieving.
8. The method for preparing a sludge curing agent according to claim 7, wherein the sieving is 20-120 mesh sieving.
9. The use method of the sludge solidifying agent as claimed in any one of claims 1 to 8, characterized in that the sludge solidifying agent accounting for 5-10% of the total amount of the sludge is added into the sludge, and the sludge is solidified after being uniformly stirred, so that the sludge meets the landfill requirement.
10. The method for using the sludge curing agent according to claim 9, wherein the water content in the sludge is 50 to 85 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910168774.8A CN111661993A (en) | 2019-03-06 | 2019-03-06 | Sludge curing agent and preparation method and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910168774.8A CN111661993A (en) | 2019-03-06 | 2019-03-06 | Sludge curing agent and preparation method and use method thereof |
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| CN111661993A true CN111661993A (en) | 2020-09-15 |
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| CN201910168774.8A Pending CN111661993A (en) | 2019-03-06 | 2019-03-06 | Sludge curing agent and preparation method and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113880380A (en) * | 2021-11-15 | 2022-01-04 | 大连海事大学 | Oily sludge treatment method and device |
| CN117247221A (en) * | 2023-11-06 | 2023-12-19 | 河海大学 | High-organic matter and ultrahigh-water-content river sludge curing material and curing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117247221A (en) * | 2023-11-06 | 2023-12-19 | 河海大学 | High-organic matter and ultrahigh-water-content river sludge curing material and curing method |
| CN117247221B (en) * | 2023-11-06 | 2024-04-16 | 河海大学 | High-organic matter and ultrahigh-water-content river sludge curing material and curing method |
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Application publication date: 20200915 |