CN111333286B - Method for treating high-water-content sludge in storage yard - Google Patents

Method for treating high-water-content sludge in storage yard Download PDF

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CN111333286B
CN111333286B CN202010198232.8A CN202010198232A CN111333286B CN 111333286 B CN111333286 B CN 111333286B CN 202010198232 A CN202010198232 A CN 202010198232A CN 111333286 B CN111333286 B CN 111333286B
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sludge
carbonization
dried
dried soil
curing agent
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CN111333286A (en
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崔春义
于春阳
赵九野
辛宇
梁志孟
王本龙
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Dalian Maritime University
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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
    • C02F11/008—Sludge treatment by fixation or solidification
    • 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
    • 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
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock

Abstract

The invention discloses a method for treating high-water-content sludge in a storage yard, which comprises the steps of doping a curing agent into the sludge and uniformly stirring the mixture; foaming the sludge by adopting a mechanical stirring method; drying the sludge by hot air; crushing and grinding the dried and solidified sludge into dry soil; adjusting the water content of the dried soil, adding a curing agent into the dried soil, and compacting and molding; and carbonizing the formed dried soil mixture to obtain the recyclable building material. After the curing agent is mixed into the sludge, the sludge is dried by hot air, so that the drying speed of the sludge is greatly accelerated, a good foundation is provided for the next treatment, the turnover speed of a sludge storage yard is accelerated, high-viscosity particles in the sludge are wrapped by pre-carbonization, the purpose of modification is achieved, and the high-viscosity sludge which is difficult to utilize originally can be made into building materials.

Description

Method for treating high-water-content sludge in storage yard
Technical Field
The invention relates to the field of sludge treatment, in particular to a method for treating high-water-content sludge in a storage yard.
Background
In order to improve the water quality of rivers and lakes and ensure the normal flood discharge capacity of rivers and lakes and the smoothness of navigation channels and ports, large-scale dredging and desilting projects are developed in all countries including China. According to statistics, the amount of dredged sludge produced in China only in the Yangtze delta zone per year reaches 8000 ten thousand meters3On the left and right, the amount of sludge thrown into the ocean every year in China is close to 2 hundred million m3The generation of a large amount of dredged sludge in water conservancy and ocean engineering in the next decade is an unavoidable reality. Dredged sludge produced in dredging works is usually treated by piling or dumping, on the one hand not only in the area of the sludgeA large amount of land is used, so that a large amount of land resources are wasted, and the land resources are thrown to the open sea, so that the effective utilization of marine resources is seriously influenced, and irreparable damage is caused to the marine environment; on the other hand, most of the dredged sludge contains pollutants such as heavy metals, organic matters and the like, and secondary pollution to the surrounding environment is inevitably caused.
Before resource treatment, sludge needs to be transferred from a storage yard, the natural water content of the storage yard sludge is high, the clay is high, the air permeability is poor, and drying treatment needs to be carried out before transfer and transportation. The energy consumption is very high when the hot air convection drying method is directly adopted for drying the silt, and although the method of doping fine sand into the silt and then carrying out hot air convection can reduce the energy consumption, a large amount of sand is consumed as a natural resource, and the method of consuming a large amount of sand is not beneficial to the sustainable use of the natural resource. The high water content in the sludge not only has a very great influence on the transfer but also is extremely disadvantageous for the carbonization process. After carbonization treatment, sludge with high water content and high clay particles is difficult to achieve a good curing effect.
Disclosure of Invention
The invention provides a method for treating high-water-content sludge in a storage yard, which is used for carrying out resource treatment on sludge with high water content, high viscosity and poor air permeability.
A method for treating high-water-content sludge in a storage yard comprises the following steps:
s1: adding a curing agent into the sludge and uniformly stirring;
s2: foaming the sludge by adopting a mechanical stirring method;
s3: drying the sludge by hot air;
s4: crushing and grinding the dried and solidified sludge into dry soil;
s5: adjusting the water content of the dried soil, adding a curing agent into the dried soil, and compacting and molding;
s6: and carbonizing the formed dried soil mixture to obtain the recyclable building material.
Further, the mass ratio of the solid to the liquid in the sludge after the incorporation of the curing agent is 0.4 to 0.45.
Further, the yard sludge is cleaned of impurities including rocks and plant debris prior to incorporation of the curing agent.
Further, the curing agent comprises 90-100 parts of steel slag powder, 0-10 parts of cement and 0-10 parts of a carbonization accelerator, wherein the carbonization accelerator is an alkaline earth metal oxide.
Further, S4 further includes the following steps:
adding water into the dried soil to enable the water content of the dried soil to be 8% -12%, and uniformly stirring;
placing the stirred dried soil in a carbonization kettle;
introducing CO2 gas with the concentration not less than 95% into the carbonization kettle, and keeping the gas pressure in the carbonization kettle at 0.1MPa for pre-carbonization for 2 hours;
grinding the pre-carbonized dry soil.
Further, the air volume for hot air drying the sludge is 15000m3The temperature is 80-120 ℃.
Further, the carbonization treatment comprises the following steps:
placing the mixed and formed dried soil mixture into a carbonization kettle;
continuously introducing CO2 gas with the concentration not less than 99 percent into the carbonization kettle, and keeping the gas pressure in the carbonization kettle between 0.3MPa and 0.5MPa for 5 to 24 hours.
Further, in S5, the water content of the dried soil is adjusted to 8% -12%.
The method for treating the high-water-content sludge in the stock dump, disclosed by the invention, has the advantages that mechanical dehydration of large equipment is not needed, the drying speed of the sludge is greatly improved by adding the curing agent and carrying out hot air drying, the turnover time of the stock dump of the flowing sludge is greatly shortened, the sludge treated is large in size, the method can be suitable for temporary sludge discharge in a dredging project, the requirement on the equipment is low, and the sludge can be transferred along with the dredging project. The whole process of resource treatment does not need high-temperature high-pressure steam curing, and the energy consumption is low. Meanwhile, the main body of the curing agent material used by the invention is industrial waste slag, which has wide source, low cost and wide market prospect.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for treating a high-water sludge in a yard in example 1 of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Example 1:
as shown in FIG. 1, a method for treating high-water-content sludge in a storage yard comprises the following steps:
and (4) framing sludge to be treated in situ on the sludge storage yard, and cleaning impurities such as stones, plant organic matter remains and the like in the sludge.
Adding a curing agent into the sludge and uniformly stirring, wherein the solid proportion in the sludge is improved by the added curing agent, and the mass ratio of the solid to the liquid in the sludge after the curing agent is added is 0.4-0.45;
after the curing agent is mixed, mechanical equipment is adopted to stir the sludge, so that the sludge is foamed, a communicated porous structure is formed through foaming, and the contact area of the sludge and air is increased;
after foaming is finished, immediately drying the sludge by hot air; covering plastic cloth on the sludge, and blowing hot air with air volume of 15000m3H, the temperature is 80-120 ℃; on one hand, the appearance of the bubbles is adjusted through high temperature to ensure that the porosity of the open pores reaches 40 percent or more, and on the other hand, the porosity of the open pores reaches more than 40 percentOn one hand, the high temperature can increase the reaction rate of the curing agent, so that the oven drying time is greatly shortened. The plastic cloth can ensure the drying effect of hot air and prevent the dispersion of the wind power of the hot air.
The sludge with high water content and high viscosity is required to be dried absolutely, a large amount of energy is consumed and the time is very long by independently drying the sludge with hot air, the daily use cost of a sludge storage yard is high, the sludge is transferred after the sludge is dried absolutely, and a large amount of storage yard use funds can be saved.
In the treatment process, the treatment method disclosed by the invention does not need any dewatering pretreatment, the water content of the sludge body is directly obtained through measurement, the amount of the curing agent to be doped is obtained through calculation, and the sludge can be directly treated, so that the occupied time of a sludge storage yard is greatly saved.
The curing agent adopts steel slag powder as a main body and cement and a carbonization accelerant as auxiliary materials, wherein the steel slag powder accounts for 90 parts, the cement accounts for 5 parts, the carbonization accelerant accounts for 5 parts (by weight), and the carbonization accelerant is an alkaline earth metal oxide such as magnesium oxide and calcium oxide. The carbonization accelerator can better accelerate the carbonization.
The steel slag is a solid waste discharged along with the steel-making process, accounts for about 10-15% of the yield of crude steel, has similar composition with cement minerals, but low hydration activity, contains a large amount of free CaO and free MgO which cause poor stability, and has high carbonization potential. The specific surface area of the steel slag micro powder selected in the embodiment is 300m2The calcium carbonate/kg steel slag has high hydration activity, calcium in the steel slag is easy to dissolve out to generate carbonization reaction, the price is moderate, and the cost is controllable. The carbonization reaction is self-heating reaction, the reaction is rapid, an external heat source is not needed, and the main reaction equation is as follows:
Cx-S-Hy+xCO2→SiO2·yH2O+xCaCO3
3CaO·SiO2+3CO2+nH2O→SiO2·nH2O+3CaCO3
2CaO·SiO2+2CO2+nH2O→SiO2·nH2O+2CaCO3
CH/MH+CO2→Ca/MgCO3+H2O
the carbonate crystal and gel-state silicon dioxide generated by the reaction can play a good role in filling pores, the strength is developed rapidly, and the strength can exceed that of the cement soil which is maintained for 28 days within a few hours of carbonization. And the structure is compact, the durability and the sealing effect on harmful substances are excellent.
The application of the steel slag can not only largely consume industrial solid wastes, but also is more economical compared with the application of other cement-based curing agents in large-scale sludge curing projects. The communicated porous structure is formed by foaming, so that the contact area with air is increased, and the carbonization efficiency is improved. On one hand, the carbonization reaction product seals and stabilizes the sludge and the heavy metal in the steel slag; on the other hand, fine sticky particles in the sludge are bonded by the carbonized products to form particles, so that the plasticity index of the sludge is greatly reduced, and the engineering performance of the sludge is improved.
The oven dried sludge is transferred from the yard to a suitable location for subsequent processing. And crushing and grinding the transferred sludge.
If the sludge is high-viscosity dried soil after being dried and broken, in order to ensure the strength of a final carbonized finished product, the high-viscosity dried soil needs to be pretreated, high-viscosity grains in the dried soil are wrapped through pre-carbonization, and the pre-carbonization process is as follows: grinding the dried soil to obtain dried soil particles with particle size not greater than 10mm, adding 8-12% water into the ground dried soil, placing into a carbonization kettle, and introducing CO with concentration not less than 95%2And the air pressure in the carbonization kettle is kept at 0.1 MPa.
If the dried soil is non-high viscosity, pre-carbonization is not needed. The pre-carbonized dry soil or non-high viscosity dry soil can be carbonized. Before carbonization, the strength of the non-high-viscosity dried soil or the pre-carbonized dried soil after direct molding carbonization is subjected to label measurement, and then the yield of the additional curing agent is selected according to the strength requirement of a resource product and finally carbonized. In the carbonization process, water is mixed into the dried soil to be treated to ensure that the water content is 8-12 percent, and the mixture is compacted and molded, and carbonized gas with the purity not less than 99 is adopted% CO2The gas pressure is 0.3-0.5MPa, and the carbonization time is 6-24 hours. And compacting and molding the dried soil to be treated to obtain the shape of the light sludge building material obtained after carbonization.
The commonly used light sludge building material is light sludge brick, sludge with different water contents is treated by the treatment method disclosed by the invention, and the treatment process and the results are shown in the following table:
Figure GDA0002494345130000051
the method comprises the steps of framing eight groups of sludge to be treated in a yard, cleaning impurities including large-particle stones and plant organic matter remains, measuring initial moisture content of the sludge, doping steel slag micro powder, stirring by adopting mechanical equipment, fully mixing the steel slag micro powder and the sludge, foaming the sludge, and immediately drying after foaming. Drying with hot air at the air volume of 15000m3And h, drying by hot air at the temperature of 100 ℃ until the soil is completely dried to obtain the dried soil. Transporting the dried soil to a proper disposal site, placing the dried soil in a carbonization kettle, and introducing CO with the concentration of 99%2And gas, maintaining the pressure in the carbonization kettle at 0.1MPa, respectively pre-carbonizing eight groups of dried soil, taking out the dried soil, drying the dried soil by hot air until the dried soil is completely dry, and crushing the dried soil, wherein the diameter of the crushed dried soil particles is less than 5 mm. Steel slag micro powder and water are mixed into the crushed dried soil, the mass ratio of the water to the solid matters (the dried soil and the steel slag micro powder) is 0.1, and eight groups of mixed dried soil are respectively prepared into green bricks in a green brick making workshop under different pressures. Placing the green brick in a carbonization kettle, and introducing CO with the concentration of 99 percent2And (3) maintaining the pressure in the carbonization kettle to be 0.3MPa, carbonizing for a certain time, and taking out to obtain the light sludge carbonized brick. The performances of the eight groups of carbonized bricks are shown in the table above, all meet the relevant standards of national building materials, and the performances are excellent.
Example 2
Framing sludge to be treated in a storage yard, cleaning impurities including large-particle stones and plant organic matter remains, determining that the initial water content of the sludge is 150%, adding a curing agent accounting for 80% of the wet weight of the sludge, wherein the curing agent is 95%% of steel slag powder and 5% of calcium oxide, stirring by adopting mechanical equipment, fully mixing the steel slag micro powder and the sludge, foaming the sludge, and immediately drying after foaming. Drying with hot air at the air volume of 15000m3And h, drying the sludge by hot air at the hot air temperature of 100 ℃ for 1.5 days to completely dry the sludge. And (4) transporting the dried soil obtained after the drying to a treatment place capable of carbonizing, and crushing, wherein the diameter of the crushed dried soil particles is less than 5 mm. Adding steel slag micro powder into the crushed dried soil, wherein the mass ratio of the steel slag micro powder to the dried soil is 0.2, adding the mixed dried soil and water into a balling disc alternately, the rotating speed of the balling disc is 45 r/min, the balling time is not 5-10 min, the mass ratio of the added water to the solid (the dried soil and the steel slag micro powder) is 0.13, placing the dried soil into a carbonization kettle after balling, and introducing CO with the concentration of 99 percent2And (3) maintaining the pressure in the carbonization kettle to be 0.5MPa and the carbonization time to be 5h by using gas, and taking out to obtain the carbonized sludge aggregate. The detection shows that the stability of the carbonized sludge aggregate is qualified, the water absorption rate is 1-3%, and the crushing index is less than 10%. Has good mechanical property and durability.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. A method for treating high-water-content sludge in a storage yard is characterized by comprising the following steps:
s1: adding a curing agent into the sludge and uniformly stirring; the curing agent comprises 90-100 parts of steel slag powder, 0-10 parts of cement and 0-10 parts of a carbonization promoter, wherein the carbonization promoter is alkaline earth metal oxide;
s2: foaming the sludge by adopting a mechanical stirring method;
s3: drying the sludge by hot air;
s4: crushing and grinding the dried and solidified sludge into dry soil; adding water into the dried soil to enable the water content of the dried soil to be 8% -12%, and uniformly stirring;
placing the stirred dried soil in a carbonization kettle;
introducing CO2 gas with the concentration not less than 95% into the carbonization kettle, and keeping the gas pressure in the carbonization kettle at 0.1MPa for pre-carbonization for 2 hours;
grinding the pre-carbonized dry soil;
s5: adjusting the water content of the dried soil, adding a curing agent into the dried soil, and compacting and molding;
s6: carbonizing the formed dried soil mixture, wherein the carbonizing treatment comprises the following steps:
placing the mixed and formed dried soil mixture into a carbonization kettle;
continuously introducing CO2 gas with the concentration not less than 99 percent into the carbonization kettle, keeping the gas pressure in the carbonization kettle between 0.3MPa and 0.5MPa, and keeping the gas pressure for 5 to 24 hours to obtain the recyclable building material.
2. The method according to claim 1, wherein the mass ratio of solids to liquid in the sludge after the addition of the curing agent is 0.4 to 0.45.
3. The method of claim 1, wherein the yard sludge is cleaned of impurities, including rocks and plant debris, prior to the incorporation of the curing agent.
4. The method for treating the high-water content sludge in the storage yard according to claim 1, wherein the air volume for drying the sludge by hot air is 15000m3The temperature is 80-120 ℃.
5. The method for treating the high-water-content sludge in the yard according to claim 1, wherein the water content of the dried soil is adjusted to 8% -12% in S5.
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CN101456662A (en) * 2008-12-24 2009-06-17 深圳市津港环保技术有限公司 Urban sludge chemical curing method
CN107337414A (en) * 2017-06-28 2017-11-10 武汉大学 A kind of new carbonization for being prepared using ocean waste silt is non-burning brick and preparation method thereof
CN108086297A (en) * 2017-11-24 2018-05-29 东南大学 A kind of ectopic activities magnesia carbonization curing sludge indigenous method

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Publication number Priority date Publication date Assignee Title
CN101456662A (en) * 2008-12-24 2009-06-17 深圳市津港环保技术有限公司 Urban sludge chemical curing method
CN107337414A (en) * 2017-06-28 2017-11-10 武汉大学 A kind of new carbonization for being prepared using ocean waste silt is non-burning brick and preparation method thereof
CN108086297A (en) * 2017-11-24 2018-05-29 东南大学 A kind of ectopic activities magnesia carbonization curing sludge indigenous method

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