CN112159052B - Quick dehydration curing agent - Google Patents
Quick dehydration curing agent Download PDFInfo
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- CN112159052B CN112159052B CN202011012354.XA CN202011012354A CN112159052B CN 112159052 B CN112159052 B CN 112159052B CN 202011012354 A CN202011012354 A CN 202011012354A CN 112159052 B CN112159052 B CN 112159052B
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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
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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
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention relates to the field of sludge treatment, in particular to a curing agent for quickly dehydrating lake and reservoir bottom sludge. The rapid dehydration curing agent comprises ferric sulfate, ferrous sulfate, silicon powder, bentonite, quicklime and polyacrylamide. The invention adopts the compounding of organic and inorganic materials to obtain the rapid bottom mud dehydration curing agent which has the advantages of high dehydration and curing speed of the bottom mud in lakes and reservoirs, low pH value of dehydrated bottom mud cakes and tail water and low leaching content of heavy metals after curing.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a curing agent for quickly dehydrating lake and reservoir bottom sludge.
Background
The silt generally refers to the sediment formed by the mixture (silt, clay, organic matter and various minerals) in the water body sinking to the bottom under the long-term physical, chemical and biological effects (Wangxue, Fan Sheng, Fenhe river channel and beach land lead, cadmium and mercury distribution characteristics research [ J ]. people yellow river, 2015, (10): 74-77.). Rivers, lakes and other water areas can generate sludge.
The lake and reservoir sludge is an extremely complex non-homogeneous body composed of inorganic calcium silicate, organic fragments, bacterial thallus, inorganic-inorganic colloidal particles and the like, wherein solid particles such as silt, fiber, animal and plant residues and the like in domestic sewage or industrial and mining wastewater are mixed, and various substances such as metal elements, microorganisms, germs, worm eggs and the like are adsorbed. From the chemical composition, there are pH value (pH value), organic matter, total cadmium (Cd), total mercury (Hg), total lead (Pb), total chromium (Cr), total arsenic (As), total copper (Cu), total zinc (Zn), total nickel (Ni), total cyanide, volatile phenol, etc., some appear in solid state, some exist in liquid state, and even appear out-of-phase transformation. The sludge particles are small, the structure is loose, the specific surface area is large, the surface is always provided with negative charges, so the sludge particles are mutually exclusive, can not be close to each other and are maintained in a suspension state, and the stable state also makes the sludge difficult to settle (Liu Li. sludge dewatering medicament and process research [ D ]. institute of graduate institute of Chinese academy of sciences (Guangzhou geochemistry institute), 2015.). Sludge reduction treatment and sludge recycling treatment are both based on sludge-water separation, on one hand, sludge particles need to be captured, and on the other hand, captured sludge particles are separated from water.
There are many ways to solidify the bottom mud, and there are 3 ways to solidify the bottom mud: firstly, applying larger pressure to make the rock and the stone become petrochemical; secondly, high-temperature melting and bonding; thirdly, curing at normal temperature. The normal temperature reinforced soil has the advantages of wide application range, stable performance, low price, local material utilization, convenient construction and maintenance and the like, and is more and more widely valued in the curing technology. The curing agents used for curing at normal temperature are different in name, such as stabilizers, Fuji soil and the like, but can be used for curing various bottom sludges.
At present, the types of the developed and utilized bottom mud curing agents are many, the principle of curing bottom mud by various bottom mud curing agents is different, and the bottom mud curing agents can be divided into 3 types according to the curing mechanism: ionizing ion curing agent, biological enzyme curing agent and hydration curing agent.
The ionic curing agent changes the double electric layer structure on the surface of clay particles through an electrochemical principle, and permanently changes the hydrophilicity of a soil body into hydrophobicity.
The biological enzyme substrate sludge curing agent is a multienzyme-based product formed by fermenting organic matters. The cohesion between the sediment particles is promoted by the catalytic action of the enzyme. But the biological enzyme has high cost and long catalysis time, and is not suitable for short-term construction requirements.
The hydration curing agent technology is to directly cement the surface of soil particles or react with soil mineral components to generate gelled substances by adopting a chemical physical method at normal temperature, so that the cohesive force of the soil particles is increased, and the aim of consolidating the soil is fulfilled.
However, the traditional solidification dredging has the problems of low solidification speed, unsatisfactory solidification effect on sludge with high water content, high solidification cost and the like.
Disclosure of Invention
The invention provides a rapid bottom mud dehydration curing agent which can lead the mud to have rapid curing speed, low pH values of a dehydrated bottom mud cake and tail water and low leaching content of heavy metals after curing, aiming at solving the problems of low curing speed, high pH values of the dehydrated and cured bottom mud cake and tail water, unsatisfactory curing effect, high leaching content of heavy metals after curing and the like in the related technologies.
The invention provides a rapid dehydration curing agent on one hand, which comprises the following components:
ferric sulfate, ferrous sulfate, silicon powder, bentonite, quicklime and polyacrylamide.
Further, the rapid dehydration curing agent comprises the following components in parts by weight:
20-30 parts of ferric sulfate,
10-20 parts of ferrous sulfate,
10-20 parts of silicon powder,
10-20 parts of bentonite,
20-30 parts of quicklime,
0.01-0.02 portion of polyacrylamide.
Further, the silicon powder of the rapid dehydration curing agent is nano-scale silicon powder.
Further, the silicon powder SiO2The content is more than or equal to 90 percent.
Further, the bentonite is organic bentonite.
Further, the organic bentonite is a broad-spectrum easily-dispersible organic bentonite.
Furthermore, the quick-dehydration curing agent is lime with the lime activity degree of more than or equal to 300 mL.
Further, the molecular weight of the polyacrylamide of the rapid dehydration curing agent is 1000-1200 ten thousand.
Further, the quick dehydration curing agent, the polyacrylamide is 1200 ten thousand.
The invention also provides application of the rapid dehydration curing agent in sludge treatment.
The invention has the following advantages:
1) the rapid dehydration curing agent provided by the invention has the advantages of simple and easily obtained raw materials and low cost.
2) The rapid dehydration curing agent provided by the invention can rapidly cure the sludge in sludge treatment, and the unconfined compressive strength after curing is high.
3) The rapid dehydration curing agent provided by the invention can finally ensure that the pH value of the cured mud cake is not higher than 9, thereby meeting the requirement of environmental capacity.
4) The dehydration curing agent provided by the invention is compounded by inorganic materials and organic materials, and quicklime in the invention reacts with water to release a large amount of heat, so that the dehydration process of sludge treatment can be accelerated.
Calcium hydroxide is formed by reaction of calcium oxide and water, ferric hydroxide and ferrous hydroxide can be generated by interaction of the calcium hydroxide, ferric sulfate and ferrous sulfate, the ferric hydroxide and the ferrous hydroxide are dispersed in the water in a colloid form, and sludge can be attached to the surfaces of sludge particles when meeting, so that the coagulation and sedimentation of the sludge particles are accelerated. Meanwhile, the ferric hydroxide and the ferrous hydroxide colloid can block the pores formed in the dehydration and solidification process of the sludge, so that the solidified sludge has a certain waterproof effect, and the seepage of heavy metals can be prevented. Calcium hydroxide generated by the reaction of the quicklime and the water and carbon dioxide in the air generate calcium carbonate, so that the hardening effect is achieved, and the unconfined compressive strength of the solidified sludge can be enhanced.
The curing agent contains organic bentonite, is adsorbed on the surface of sludge particles, can drain water of the sludge, and accelerates the dehydration process of the sludge by matching the effect of quicklime.
The silicon powder contained in the invention mainly contains nano SiO2Can be filled in the sludge formed in the solidification processIn the gaps, the unconfined compressive strength of the solidified sludge is further enhanced.
5) The dehydration curing agent is used for curing the sludge, and the effects of accelerating the dehydration process of the sludge treatment, enhancing the unconfined compressive strength of the cured sludge, reducing the leaching content of heavy metals after curing and ensuring that the pH value of a cured mud cake is not higher than 9 can be finally obtained.
Detailed Description
To further illustrate the present invention, the following examples are provided for illustration. The raw materials used in the following examples of the invention are all commercial products, wherein the silicon powder is nano-scale silicon powder with SiO2 content being more than or equal to 90%; the organic bentonite is broad-spectrum easy-dispersion organic bentonite; the quicklime is quicklime with lime activity degree more than or equal to 300 mL; the polyacrylamide has a molecular weight of 1000-1200 ten thousand.
Example 1
A fast-dehydrating curing agent comprises the following components:
20 portions of ferric sulfate,
20 portions of ferrous sulfate,
15 parts of silicon powder,
10 portions of organic bentonite,
30 portions of quicklime,
0.01 part of polyacrylamide (M ═ 1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Example 2
A fast-dehydrating curing agent comprises the following components:
25 portions of ferric sulfate,
15 portions of ferrous sulfate,
10 portions of silicon powder,
10 portions of organic bentonite,
15 portions of quicklime,
0.01 part of polyacrylamide (M1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Example 3
A fast-dehydrating curing agent comprises the following components:
30 portions of ferric sulfate,
10 portions of ferrous sulfate,
20 parts of silicon powder,
20 portions of organic bentonite,
20 parts of quicklime,
0.02 part of polyacrylamide (M1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Example 4
A fast-dehydrating curing agent comprises the following components:
30 portions of ferric sulfate,
15 portions of ferrous sulfate,
10 portions of silicon powder,
15 portions of organic bentonite,
25 parts of quicklime,
0.02 part of polyacrylamide (M1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Example 5
A fast-dehydrating curing agent comprises the following components:
25 portions of ferric sulfate,
10 portions of ferrous sulfate,
20 parts of silicon powder,
10 portions of organic bentonite,
30 portions of quicklime,
0.02 part of polyacrylamide (M1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Example 6
A fast-dehydrating curing agent comprises the following components:
20 portions of ferric sulfate,
20 portions of ferrous sulfate,
15 parts of silicon powder,
20 portions of organic bentonite,
20 parts of quicklime,
0.01 part of polyacrylamide (M1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Example 7
A fast-dehydrating curing agent comprises the following components:
25 portions of ferric sulfate,
15 portions of ferrous sulfate,
20 parts of silicon powder,
20 portions of organic bentonite,
20 parts of quicklime,
0.01 part of polyacrylamide (M1000 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Example 8
A fast-dehydrating curing agent comprises the following components:
20 portions of ferric sulfate,
20 portions of ferrous sulfate,
15 parts of silicon powder,
10 portions of organic bentonite,
30 portions of quicklime,
0.01 part of polyacrylamide (M1100 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Example 9
A fast-dehydrating curing agent comprises the following components:
30 portions of ferric sulfate,
10 portions of ferrous sulfate,
10 portions of silicon powder,
15 portions of organic bentonite,
25 parts of quicklime,
0.01 part of polyacrylamide (M1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Comparative example 1
A fast-dehydrating curing agent comprises the following components:
10 portions of ferric sulfate,
5 portions of ferrous sulfate,
15 parts of silicon powder,
10 portions of organic bentonite,
30 portions of quicklime,
0.01 part of polyacrylamide (M ═ 1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Comparative example 2
A fast-dehydrating curing agent comprises the following components:
20 portions of ferric sulfate,
20 portions of ferrous sulfate,
15 parts of silicon powder,
10 portions of organic bentonite,
10 portions of quicklime,
0.01 part of polyacrylamide (M ═ 1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
Comparative example 3
A fast-dehydrating curing agent comprises the following components:
20 portions of ferric sulfate,
20 portions of ferrous sulfate,
5 parts of silicon powder,
10 portions of organic bentonite,
30 portions of quicklime,
0.01 part of polyacrylamide (M ═ 1200 ten thousand).
The preparation method of the dehydration curing agent comprises the following steps:
accurately weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes, and obtaining the product.
The sludge treatment method using the rapid dehydration curing agent comprises the following steps:
adding the prepared curing agent for rapid dehydration into sludge (the initial water content is 88.3%, the lead leaching content is 9.26mg/kg, the mercury leaching content is 0.56mg/kg, and the arsenic leaching content is 7.56mg/kg) in a certain lake and reservoir of Guangzhou to carry out a curing test; the addition amount of the curing agent is 10% of the mass of the sludge, then the sludge is stirred in a large-scale stirrer for 1h at the rotating speed of 20r/min, after the stirring is finished, the stirring is kept stand for 24h, and the supernatant is separated, wherein the supernatant is the treated tail water. And (4) spreading and drying the insoluble substances in the open air until the insoluble substances are completely solidified, thereby finishing sludge treatment.
The curative ingredient composition for each example and comparative example is as follows.
TABLE 1 curative component composition
Examples of effects
The treated sludge was tested using the national standard GB/T50123-1999 Standard for geotechnical test methods and GB5085.3-2007 Standard for identification of hazardous waste Leaching toxicity. The results are as follows:
TABLE 2 test data
Note: wherein ND represents not detected; the concentration limit of hazardous components in the solid waste leachate in GB5085.3-2007 requires lead (in terms of total lead): 5 mg/L; mercury (in total mercury): 0.1 mg/L; arsenic (as total arsenic): 5 mg/L.
As can be seen from the above examples and comparative examples, the rapid dehydration curing agent obtained by matching ferric sulfate, ferrous sulfate, silicon powder, organic bentonite, quicklime and polyacrylamide in a proper proportion can be used for achieving the effects of accelerating the dehydration process of sludge treatment, enhancing the unconfined compressive strength of the solidified sludge, reducing the leaching content of heavy metals after solidification and enabling the pH value of the solidified mud cake to be not higher than 9 in the lake and reservoir sediment treatment.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A curing agent for rapidly dehydrating lake and reservoir sediment comprises the following components in parts by weight:
20-30 parts of ferric sulfate,
10-20 parts of ferrous sulfate,
10-20 parts of silicon powder,
10-20 parts of bentonite,
20-30 parts of quicklime,
0.01-0.02 part of polyacrylamide;
the silicon powder is nano-scale silicon powder, SiO2The content is more than or equal to 90 percent;
the bentonite is organic bentonite.
2. The fast dehydration curing agent according to claim 1, wherein said organobentonite is a broad spectrum easy dispersible type organobentonite.
3. The quick dehydration curing agent according to claim 1, wherein the quicklime has lime activity degree of 300mL or more.
4. The fast dehydration curing agent according to claim 1, wherein the molecular weight of said polyacrylamide is 1000-1200 ten thousand.
5. The fast dehydration curing agent according to claim 4, wherein said polyacrylamide has a molecular weight of 1200 ten thousand.
6. A method for preparing the fast dehydration curing agent according to any one of claims 1 to 5, comprising the steps of:
weighing the components in parts by weight, mixing and grinding the components until the particle size is less than 200 meshes.
7. Use of a fast dewatering curing agent according to any one of claims 1 to 5 in sludge treatment.
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| WO2007101253A2 (en) * | 2006-02-28 | 2007-09-07 | Auburn Universtity | In-situ immobilization of metals in contaminated sites using stabilized nanoparticles |
| WO2013063774A1 (en) * | 2011-11-02 | 2013-05-10 | Empire Technology Development Llc | Solidifying sludge |
| CN106348569A (en) * | 2016-10-18 | 2017-01-25 | 四川铁科新型建材有限公司 | Low-dosage slurry curing agent composition, and preparation method and application method thereof |
| CN106865926A (en) * | 2017-03-09 | 2017-06-20 | 中交疏浚技术装备国家工程研究中心有限公司 | One kind has filled municipal sludge curing agent and its deep dehydration method |
| CN108726822A (en) * | 2017-08-09 | 2018-11-02 | 上海傲江生态环境科技有限公司 | A kind of stabilizer and its antihunt means for heavy metal polluted bed mud improvement |
| CN109293326B (en) * | 2018-11-23 | 2021-02-26 | 中国葛洲坝集团绿园科技有限公司 | Curing agent for sludge treatment and preparation method and application thereof |
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