CN112250265A - Sludge curing agent, preparation method thereof and sludge curing and stabilizing treatment method - Google Patents
Sludge curing agent, preparation method thereof and sludge curing and stabilizing treatment method Download PDFInfo
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- CN112250265A CN112250265A CN202011112208.4A CN202011112208A CN112250265A CN 112250265 A CN112250265 A CN 112250265A CN 202011112208 A CN202011112208 A CN 202011112208A CN 112250265 A CN112250265 A CN 112250265A
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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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Abstract
The invention discloses a preparation method of a sludge curing agent, which comprises the following components in parts by mass: 20-35 parts of Portland cement, 10-20 parts of quick lime, 15-20 parts of fly ash, 4-8 parts of bentonite, 7-10 parts of coal slag, 4-8 parts of titanium chloride slag and 3-6 parts of ferrous sulfate. Also discloses a sludge curing agent prepared by the method. Also discloses a sludge solidification and stabilization treatment method, which comprises the step of using the sludge curing agent to carry out sludge solidification and stabilization treatment. The beneficial effects are as follows: can obviously improve the thawing resistance of the solidified sludge.
Description
Technical Field
The invention relates to the technical field of environmental engineering, in particular to a sludge solidification-stabilization technology.
Background
The sludge is a sediment substance generated in the water treatment process of a sewage treatment plant and generally accounts for 0.5-1% of the total amount of the sewage. The components of the sludge are very complex, the sludge is an aggregate consisting of zoogloea formed by a plurality of microorganisms and organic matters and inorganic matters adsorbed by the zoogloea, the sludge contains a large amount of water (more than 90 percent), and also contains organic matters, heavy metals and salts which are difficult to degrade, pathogenic microorganisms, parasitic ova and the like, the content of the organic matters in the sludge is high, the sludge is extremely easy to decay, stink is generated, and a large amount of untreated sludge is stacked and discharged to cause pollution.
With the rapid development of the sewage treatment industry in China, the sewage treatment capacity and the treatment rate are rapidly increased, and the sludge yield is also rapidly increased. Therefore, how to reasonably treat and dispose the sludge becomes a problem which is regarded by urban sewage plants and related departments. At home and abroad, a plurality of methods for treating sludge exist, and at present, incineration treatment and solidification-stabilization treatment are mainly adopted.
The solidification-stabilization treatment technology is characterized in that solidification-stabilization materials (also called curing agents) are added to glue sludge particles, the water content of the sludge is reduced, the mechanical property of the sludge is improved, and toxic and harmful pollutants such as heavy metals in the sludge are fixed, so that the sludge can reach the landfill standard. At present, cement, quicklime, fly ash and the like are generally adopted at home and abroad as solidification stabilizing materials, and the cement, the quicklime, the fly ash and the like are mainly used for generating gel hydrates and cementing sludge particles. Researches show that the solidification and stabilization materials can better improve the mechanical property of solidified sludge, reduce the water content and reach the standard of soil for landfill or construction.
However, the existing solidified sludge has poor durability, and is easy to be damaged by thawing in northern cold regions, so that the strength of the solidified sludge is obviously reduced to be difficult to meet the building soil standard, and the popularization of the sludge solidification-stabilization treatment technology is seriously influenced.
Disclosure of Invention
The invention provides a preparation method of a sludge curing agent, which aims to improve the thawing resistance of the cured sludge after curing-stabilizing treatment.
The technical scheme adopted by the invention is as follows: the preparation method of the sludge curing agent comprises the following raw materials in parts by mass: 20-35 parts of Portland cement, 10-20 parts of quick lime, 15-20 parts of fly ash, 4-8 parts of bentonite, 7-10 parts of coal slag, 4-8 parts of titanium chloride slag and 3-6 parts of ferrous sulfate.
It should be noted that the titanium chloride slag in the invention refers to waste slag generated in the titanium tetrachloride production link in the titanium dioxide production by the chlorination method, and includes dust collected by flying and volatilizing in the high titanium slag production process by electric furnace smelting, crushing to prepare finished high titanium slag, over-fine titanium slag generated in the hammer-crushing winnowing process in the chlorination ingredient production process, and coarse TiCl production by boiling chlorination4Slag discharged in the process and dust-collecting slag. The waste residue comprises various metals (titanium, aluminum, iron, calcium, magnesium, potassium, cobalt, chromium, manganese and the like) brought by the titanium-rich material and the petroleum coke, compounds such as salts, oxides, chlorides and the like of the metals, carbon and the like.
As a further improvement of the invention, the granularity of the coal slag is 5-15 mm, and the titanium chloride slag can pass through a 200-mesh sieve. Preferably, the preparation raw material also comprises 2-4 parts of polyacrylamide. Preferably, the preparation raw material also comprises 2-5 parts of calcium oxide. Preferably, the preparation raw materials further comprise 1-4 parts of aluminum powder.
As is easy to understand, the sludge curing agent is obtained by uniformly mixing the preparation raw materials according to the conventional method.
The invention also discloses a sludge curing agent, which is prepared by the preparation method of the sludge curing agent.
The invention also discloses a sludge solidification and stabilization treatment method, which comprises the step of performing sludge solidification and stabilization treatment by using the sludge curing agent.
As a further improvement of the present invention, the sludge solidification and stabilization treatment method specifically comprises the following steps:
s1, uniformly mixing the sludge and the sludge curing agent according to the mass ratio of 10: 1-4 to obtain a mixture;
and S2, curing the mixture until the water content and the strength meet the landfill requirement to obtain the cured sludge.
The sludge solidification and stabilization treatment method is suitable for treating sludge with the water content of 70-99%.
The invention has the beneficial effects that: can obviously improve the thawing resistance of the solidified sludge.
Detailed Description
The present invention will be further described with reference to the following examples.
The first embodiment is as follows:
the sludge solidification and stabilization treatment is carried out according to the following steps:
(1) preparing the following raw materials in parts by mass: 30 parts of Portland cement, 15 parts of quick lime, 20 parts of fly ash, 6 parts of bentonite, 8 parts of coal slag with the granularity of 9-14 mm, 7 parts of titanium chloride slag sieved by a 200-mesh sieve, 5 parts of ferrous sulfate, 2.5 parts of polyacrylamide, 4 parts of calcium oxide and 3 parts of aluminum powder.
(2) And uniformly mixing the raw materials to obtain the sludge curing agent.
(3) 1t of sludge (with water content of 86.48%) and 0.2t of the sludge curing agent are respectively conveyed into a stirrer by a screw conveyor and fully stirred for 30min to form a mixture.
(4) And maintaining the mixture in a maintenance field for 28 days to obtain the solidified sludge.
Example two:
the sludge solidification and stabilization treatment is carried out according to the following steps:
(1) preparing the following raw materials in parts by mass: 22 parts of Portland cement, 18 parts of quick lime, 18 parts of fly ash, 8 parts of bentonite, 7 parts of coal slag with the granularity of 9-14 mm, 8 parts of titanium chloride slag which is sieved by a 200-mesh sieve, 3 parts of ferrous sulfate, 2.5 parts of polyacrylamide, 4 parts of calcium oxide and 3 parts of aluminum powder.
(2) And uniformly mixing the raw materials to obtain the sludge curing agent.
(3) 1t of sludge (with water content of 86.48%) and 0.3t of the sludge curing agent are respectively conveyed into a stirrer by a screw conveyor and fully stirred for 30min to form a mixture.
(4) The mixture was simultaneously cured in the same curing field as in the first example for 28 days to obtain cured sludge.
Example three:
the sludge solidification and stabilization treatment is carried out according to the following steps:
(1) preparing the following raw materials in parts by mass: 35 parts of Portland cement, 10 parts of quick lime, 15 parts of fly ash, 4 parts of bentonite, 10 parts of coal slag with the granularity of 9-14 mm, 5 parts of titanium chloride slag sieved by a 200-mesh sieve, 6 parts of ferrous sulfate, 2.5 parts of polyacrylamide, 4 parts of calcium oxide and 3 parts of aluminum powder.
20-35 parts of Portland cement, 10-20 parts of quick lime, 15-20 parts of fly ash, 4-8 parts of bentonite, 7-10 parts of coal slag, 4-8 parts of titanium chloride slag and 3-6 parts of ferrous sulfate
(2) And uniformly mixing the raw materials to obtain the sludge curing agent.
(3) 1t of sludge (with water content of 86.48%) and 0.25t of the sludge curing agent are respectively conveyed into a stirrer by a screw conveyor and fully stirred for 30min to form a mixture.
(4) The mixture was simultaneously cured in the same curing field as in the first example for 28 days to obtain cured sludge.
Comparative example one:
the sludge solidification and stabilization treatment is carried out according to the following steps:
(1) preparing the following raw materials in parts by mass: 30 parts of Portland cement, 15 parts of quick lime, 20 parts of fly ash, 6 parts of bentonite, 8 parts of coal cinder with the granularity of 9-14 mm, 5 parts of ferrous sulfate, 2.5 parts of polyacrylamide, 4 parts of calcium oxide and 3 parts of aluminum powder.
(2) And uniformly mixing the raw materials to obtain the sludge curing agent.
(3) 1t of sludge (same batch as in example one, water content of 86.48%) and 0.2t of the sludge curing agent were fed into a stirrer by a screw conveyor, and stirred sufficiently for 30min to form a mixture.
(4) The mixture was simultaneously cured in the same curing field as in the first example for 28 days to obtain cured sludge.
And (3) detecting the compressive strength:
the water content of the solidified sludge of each example was measured at the time of curing to 3d and 28d, and 20 cylindrical test pieces each having a diameter of 90mm and a height of 150mm were prepared from the solidified sludge of the above-described examples one to three and comparative example under the same conditions. The unconfined compressive strength instrument is adopted to detect the compressive strength of the test piece, and the result is shown in table 1.
TABLE 1 moisture content and unconfined compressive strength test result table
Note that unconfined compressive strength data are presented as mean. + -. standard deviation.
Anti-freeze test:
under the same test conditions, each test piece manufactured when the curing time reaches 28d is soaked in water, and the water level is about 3cm higher than that of the test piece. Then take out the test piece, give the test piece serial number, put into the low temperature box with it, remain at least 10mm space between test piece and the test piece, avoid the air not circulate, freeze together. The temperature of the low-temperature box is set to be-20 ℃, and the freezing time is set to be 24 hours. And after freezing, taking out the test piece, putting the test piece into a water bath at 20 ℃ for thawing, wherein the water surface is about 3cm higher than the test piece, and the thawing time is 12 h. And after the time is up, taking out the test piece, wherein the process is a primary thawing cycle. And repeating the steps for 8 times of thawing cycles, and detecting the compressive strength of the test piece by using an unconfined compressive strength instrument after completing the 2 nd, 5 th and 8 th thawing cycles respectively, wherein the results are shown in a table 2.
TABLE 2 compression Strength test results after thawing
Note that unconfined compressive strength data are presented as mean. + -. standard deviation.
As can be seen from Table 1, the water content of the sludge can be reduced from 86.48% to 68.66% and the compressive strength can reach 49.96KPa when the sludge is treated by the sludge curing agent provided by the invention for 3 days. And at 28d, the water content of the sludge is further reduced to 36.43%, and the compressive strength can be further improved to 84.65 KPa. The sludge curing agent has obvious effects on reducing the water content of the sludge cured substance and improving the compressive strength of the sludge cured substance.
As can be seen from the test data of the first example and the first comparative example in Table 1, under the condition that the material proportion of the sludge and the curing agent is the same, the difference between the using effects of the curing agent containing the titanium chloride slag and the curing agent without the titanium chloride slag is not large. The method shows that whether the titanium chloride slag is added into the curing agent has no obvious influence on the water content and the compressive strength of the cured sludge.
As can be seen from Table 2, the compressive strength of the solidified sludge in each example is reduced to different degrees after multiple times of thawing cycles, and the loss rate of the thawing test strength is shown in Table 3:
TABLE 3 Freeze thaw test Strength loss Rate
| ThawingNumber of times | Example one | Example two | EXAMPLE III | Comparative example 1 |
| 2 times (one time) | 3.74％ | 4.18％ | 5.44％ | 12.38％ |
| 5 times (twice) | 9.73％ | 11.30％ | 16.01％ | 27.46％ |
| 8 times (by volume) | 18.18％ | 18.72％ | 27.19％ | 44.61％ |
As can be seen from Table 3, in the first example and the first comparative example, the solidification agent containing titanium chloride slag can significantly improve the anti-freezing property of the solidified sludge compared with the solidification agent without titanium chloride slag under the condition that the material ratio of the sludge and the solidification agent is the same.
Claims (10)
1. The preparation method of the sludge curing agent is characterized in that the preparation raw materials comprise the following components in parts by mass: 20-35 parts of Portland cement, 10-20 parts of quick lime, 15-20 parts of fly ash, 4-8 parts of bentonite, 7-10 parts of coal slag, 4-8 parts of titanium chloride slag and 3-6 parts of ferrous sulfate.
2. The method for producing a sludge curing agent according to claim 1, characterized in that: the granularity of the coal slag is 5-15 mm, and the titanium chloride slag can pass through a 200-mesh sieve.
3. The method for producing a sludge curing agent according to claim 2, characterized in that: the preparation raw materials also comprise 2-4 parts of polyacrylamide.
4. The method for producing a sludge curing agent according to claim 3, wherein: the preparation raw materials also comprise 2-5 parts of calcium oxide.
5. The method for producing a sludge curing agent according to claim 4, wherein: the preparation raw materials also comprise 1-4 parts of aluminum powder.
6. The method for producing a sludge curing agent according to any one of claims 1 to 5, wherein: comprises the step of mixing the preparation raw materials.
7. The sludge curing agent prepared by the method for preparing the sludge curing agent according to the claims 1-5.
8. The sludge solidification and stabilization treatment method is characterized by comprising the following steps: comprising the step of performing sludge solidification stabilization treatment using the sludge solidifying agent according to claim 7.
9. The sludge solidification stabilization treatment method according to claim 8, characterized in that: the method comprises the following steps:
s1, uniformly mixing sludge and the sludge curing agent according to the mass ratio of 10: 1-4 to obtain a mixture;
and S2, curing the mixture until the water content and the strength meet the landfill requirement to obtain the cured sludge.
10. The sludge solidification stabilization disposal method according to claim 9, characterized in that: the water content of the sludge is 70-99%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114573200A (en) * | 2022-03-24 | 2022-06-03 | 瑞泰境美(山东)环保科技有限公司 | Curing agent for sludge solidification, preparation method, solidification method and solidification device |
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Application publication date: 20210122 |