CN114949939A - Defoaming agent for landfill leachate evaporation and preparation method thereof - Google Patents
Defoaming agent for landfill leachate evaporation and preparation method thereof Download PDFInfo
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- CN114949939A CN114949939A CN202210479137.4A CN202210479137A CN114949939A CN 114949939 A CN114949939 A CN 114949939A CN 202210479137 A CN202210479137 A CN 202210479137A CN 114949939 A CN114949939 A CN 114949939A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a defoaming agent for evaporating landfill leachate and a preparation method thereof, and belongs to the technical field of defoaming agents. The defoaming agent comprises the following components in percentage by mass: 10-30% of polyether modified polysiloxane, 0.5-1.5% of thickening agent, 1-5% of corrosion and scale inhibitor, 1-4% of wetting agent, 6-10% of penetrating agent, 3-6% of solubilizer and 50-80% of deionized water; the corrosion and scale inhibitor is polyepoxysuccinic acid or polyaspartic acid. The defoaming agent is prepared by compounding polyether modified polysiloxane, a thickening agent, a corrosion and scale inhibitor, a wetting agent, a penetrating agent and a solubilizer, has obvious defoaming and foam inhibiting performances, and is beneficial to increasing the evaporation concentration multiple.
Description
Technical Field
The invention belongs to the technical field of defoaming agents, and particularly relates to a defoaming agent for evaporating landfill leachate and a preparation method thereof.
Background
The landfill leachate is a large amount of wastewater generated by leaching free water, natural precipitation and water generated by decomposing organic matters contained in the garbage, surface water and underground water which permeate a landfill site in the process of landfill and stacking. Because the components of the garbage are very complex, the generated garbage leachate is special wastewater with complex components, high organic matters, high ammonia nitrogen and high salinity, and the concentration of pollutants contained in 1t of leachate is about equal to that of pollutants contained in 100t of municipal sewage. Leachate, if discharged directly, can cause irreversible damage to the surrounding environment, particularly to groundwater.
The percolate can be simply divided into young percolate (less than 5 years) and mature percolate (middle-aged and old, respectively 5-10 years and more than 10 years) according to the landfill time. Young leachate generally has higher BOD 5 COD, the biological treatment can achieve better effect, but BOD of the percolate of middle and old age 5 Low COD and low biodegradability. Therefore, the middle-aged and old percolate is treated by an evaporation method generally, and the evaporation method is used for treating the percolate, namely, volatile components (such as micromolecular volatile organic compounds, NH) in the wastewater 3 Etc.) and components which are difficult to volatilize (humic acid, fulvic acid, Total Dissolved Solids (TDS), etc.) are separated, and a good treatment effect can be achieved. With the wide application of the evaporation treatment process, the problem of foam in the evaporation treatment process is increasingly prominent, and the liquid level in the evaporation tank and the stability of the effluent quality can be influenced due to the complex organic matter content of the percolate and the high foam in the evaporation process. The variety of the defoaming agents applied in the landfill leachate treatment is more, and although the reports and the applications of polyether defoaming agents and organic silicon defoaming agents are more at present, the number of the defoaming agents suitable for the landfill leachate evaporation treatment process is less.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a defoaming agent for evaporating landfill leachate and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: in a first aspect, a defoaming agent for landfill leachate evaporation is provided, which comprises the following components in percentage by mass: 10-30% of polyether modified polysiloxane, 0.5-1.5% of thickening agent, 1-5% of corrosion and scale inhibitor, 1-4% of wetting agent, 6-10% of penetrating agent, 3-6% of solubilizer and 50-80% of deionized water; the corrosion and scale inhibitor is polyepoxysuccinic acid or polyaspartic acid.
According to the characteristics of complex organic components, high temperature, more suspended matters and the like of leachate in the evaporation process of the landfill leachate, the polyether modified polysiloxane compound defoaming agent is invented; the Si-C type self-emulsifying polyether modified polysiloxane is used, so that the high-temperature stability and the acid-base stability of the defoaming agent can be improved, the problems of poor emulsification of an organic silicon defoaming agent, residual silicone oil after high-temperature demulsification and difficulty in cleaning are solved by utilizing the self-emulsifying performance of the defoaming agent, and the defoaming and foam inhibiting performance of the defoaming agent on landfill leachate and the scale inhibiting performance of the defoaming agent are improved by compounding the wetting agent, the penetrating agent, the solubilizer and the corrosion scale inhibitor, so that the serious scaling of the landfill leachate in the high-temperature evaporation process is prevented, and the concentration multiple is increased. The polyepoxysuccinic acid or polyaspartic acid is selected as the corrosion and scale inhibitor, so that the scale inhibition performance of the defoaming agent is improved, and the defoaming speed of the defoaming agent is improved by combining the polyepoxysuccinic acid or polyaspartic acid with the polyether modified polysiloxane. The components are matched with each other, so that the foam inhibition time, the defoaming speed and the scale inhibition performance of the defoaming agent can be improved, and the concentration multiple is improved.
Preferably, the defoaming agent comprises the following components in percentage by mass: 20-25% of polyether modified polysiloxane, 0.5-0.8% of thickening agent, 2-3% of corrosion and scale inhibitor, 2-3% of wetting agent, 5-8% of penetrating agent, 3-4% of solubilizer and the balance of deionized water. The inventor finds that the performance of the defoaming agent is better under the above proportion.
Preferably, the defoaming agent comprises the following components in percentage by mass: 25% of polyether modified polysiloxane, 0.6% of thickening agent, 3% of corrosion and scale inhibitor, 3% of wetting agent, 8% of penetrating agent, 4% of solubilizer and 56.4% of deionized water. Under the above proportion, the defoaming agent has the shortest defoaming time, the longest foam inhibition time and excellent scale inhibition performance, and the effect of increasing the evaporation concentration multiple is the best.
Preferably, the solubilizer is glyceryl monostearate or glycerol dioleate, and the solubilizer and the polyether modified polysiloxane are compounded, so that the dissolving effect of the defoaming agent on the landfill leachate can be improved, and the evaporation concentration multiple of the landfill leachate is further improved.
Preferably, the penetrating agent is fatty alcohol-polyoxyethylene ether or isomeric tridecanol polyoxyethylene ether, and the penetrating agent and the polyether modified polysiloxane are compounded, so that the penetrating speed of the defoaming agent in a system is increased, the defoaming effect of the polyether modified polysiloxane is improved, the defoaming speed is improved, and meanwhile, the excellent dispersing effect is achieved, and the scaling is reduced.
Preferably, the wetting agent is polyoxyethylene oleate or polyoxyethylene stearate, the wetting agent increases the wetting property of the defoaming agent, and the wetting agent is compounded with the polyether modified polysiloxane to increase the wetting property of the defoaming agent in a system, accelerate the acting time of the defoaming agent, improve the defoaming effect of the polyether modified polysiloxane, improve the defoaming speed, and simultaneously have an excellent dispersion effect and reduce scaling.
Preferably, the thickener is sodium carboxymethyl cellulose or carboxymethyl cellulose. The sodium carboxymethyl cellulose or the carboxymethyl cellulose is used as a thickening agent, so that the stability of the defoaming agent emulsion in a complex organic matter system can be improved, and the defoaming agent is not easy to precipitate in the complex organic matter system.
In a second aspect, a method for preparing an antifoaming agent is provided, which comprises the following steps:
(1) putting the thickening agent into water, heating and stirring to completely dissolve the thickening agent, and cooling to obtain a thickening agent solution;
(2) adjusting the pH value of the corrosion and scale inhibitor to be neutral by using sulfuric acid under stirring;
(3) weighing the thickener solution obtained in the step (1), the corrosion and scale inhibitor obtained in the step (2), the polyether modified polysiloxane, the wetting agent, the penetrating agent and the solubilizer in proportion, heating and stirring uniformly, and cooling to normal temperature to obtain the defoaming agent.
The preparation method of the defoaming agent can firstly carry out the step (2) and then carry out the step (1), and can also carry out the step (1) and the step (2) simultaneously, the sequence of the step (1) and the step (2) has no influence on the preparation of the defoaming agent, and the sequence can be selected according to needs.
The corrosion and scale inhibitor used in the application is alkaline, so that the influence of the defoaming agent on the pH value of a landfill leachate system is avoided, and the pH value of the corrosion and scale inhibitor needs to be adjusted to be neutral in the process of preparing the defoaming agent.
Preferably, the heating temperature of the step (1) is 80 ℃, and the stirring time is 1 h.
Preferably, the heating temperature of the step (1) is 50 ℃, and the stirring time is 1 h.
Compared with the prior art, the invention has the beneficial effects that: the defoaming agent is prepared by compounding polyether modified polysiloxane, a thickening agent, a corrosion and scale inhibitor, a penetrating agent, a wetting agent and a solubilizer, and has remarkable defoaming and foam inhibiting performances and can improve the evaporation concentration multiple.
Drawings
FIG. 1 shows a landfill leachate stock solution;
FIG. 2 shows landfill leachate concentrated 20 times without the addition of a defoaming agent;
figure 3 is a landfill leachate concentrated 20 times with the addition of the defoamer of example 3.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to the following detailed description and accompanying drawings.
Example 1
The embodiment provides a defoaming agent for evaporating landfill leachate, which comprises the following components in percentage by mass: 20% of polyether modified polysiloxane, 0.8% of sodium carboxymethylcellulose, 2% of polyepoxysuccinic acid, 6% of isomeric tridecanol polyoxyethylene ether, 3% of oleic acid polyoxyethylene ester, 2% of glyceryl monostearate and 66.2% of water.
The embodiment also provides a preparation method of the defoaming agent for evaporating the landfill leachate, which comprises the following steps:
(1) weighing 1.2 parts by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1 hour at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickening agent solution;
(2) adding sulfuric acid into the polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) weighing 67 parts by weight of the thickening agent obtained in the step (1), 20 parts by weight of polyether modified polysiloxane, 2 parts by weight of polyepoxysuccinic acid obtained in the step (2), 2 parts by weight of glyceryl monostearate, 6 parts by weight of isomeric tridecanol polyoxyethylene ether and 3 parts by weight of oleic acid polyoxyethylene ester, stirring for 1h at the temperature of 50 ℃ and the rotating speed of 80r/min, cooling to normal temperature, and standing to obtain the defoaming agent.
Example 2
The embodiment provides a defoaming agent for evaporating landfill leachate, which comprises the following components in percentage by mass: 20% of polyether modified polysiloxane, 0.5% of sodium carboxymethylcellulose, 4% of glyceryl monostearate, 3% of polyepoxysuccinic acid, 8% of isomeric tridecanol polyoxyethylene ether, 3% of oleic acid polyoxyethylene ester and 61.5% of water.
The embodiment also provides a preparation method of the defoaming agent for evaporating the landfill leachate, which comprises the following steps:
(1) weighing 0.8 part by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1 hour at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickening agent solution;
(2) adding sulfuric acid into the polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) weighing 63 parts by weight of the thickening agent obtained in the step (1), 20 parts by weight of polyether modified polysiloxane, 3 parts by weight of polyepoxysuccinic acid obtained in the step (2), 4 parts by weight of glyceryl monostearate, 8 parts by weight of isomeric tridecanol polyoxyethylene ether and 3 parts by weight of oleic acid polyoxyethylene ester, stirring for 1h at the temperature of 50 ℃ and the rotating speed of 80r/min, cooling to normal temperature, and standing to obtain the defoaming agent.
Example 3
The embodiment provides a defoaming agent for evaporating landfill leachate, which comprises the following components in percentage by mass: 25% of polyether modified polysiloxane, 0.6% of sodium carboxymethylcellulose, 4% of glyceryl monostearate, 3% of polyepoxysuccinic acid, 8% of isomeric tridecanol polyoxyethylene ether, 3% of oleic acid polyoxyethylene ester and 56.4% of water.
The embodiment also provides a preparation method of the defoaming agent for evaporating the landfill leachate, which comprises the following steps:
(1) weighing 1 part by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1 hour at the temperature of 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickening agent solution;
(2) adding sulfuric acid into the polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) weighing 57 parts by weight of the thickening agent obtained in the step (1), 25 parts by weight of polyether modified polysiloxane, 3 parts by weight of polyepoxysuccinic acid obtained in the step (2), 3 parts by weight of glyceryl monostearate, 8 parts by weight of isomeric tridecanol polyoxyethylene ether and 3 parts by weight of oleic acid polyoxyethylene ester, stirring for 1h at the temperature of 50 ℃ and the rotating speed of 80r/min, cooling to normal temperature, and standing to obtain the defoaming agent.
Example 4
The embodiment provides a defoaming agent for evaporating landfill leachate, which comprises the following components in percentage by mass: 10% of polyether modified polysiloxane, 1.5% of sodium carboxymethylcellulose, 3% of glyceryl monostearate, 2% of polyepoxysuccinic acid, 8% of isomeric tridecanol polyoxyethylene ether, 2% of oleic acid polyoxyethylene ester and 73.5% of water.
The embodiment also provides a preparation method of the defoaming agent for evaporating the landfill leachate, which comprises the following steps:
(1) weighing 2 parts by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1 hour at the temperature of 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickening agent solution;
(2) adding sulfuric acid into the polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) weighing 73 parts by weight of the thickening agent obtained in the step (1), 10 parts by weight of polyether modified polysiloxane, 2 parts by weight of polyepoxysuccinic acid obtained in the step (2), 3 parts by weight of glyceryl monostearate, 8 parts by weight of isomeric tridecanol polyoxyethylene ether and 2 parts by weight of oleic acid polyoxyethylene ester, stirring for 1h at the temperature of 50 ℃ and the rotating speed of 80r/min, cooling to normal temperature, and standing to obtain the defoaming agent.
Example 5
The embodiment provides a defoaming agent for evaporating landfill leachate, which comprises the following components in percentage by mass: 30% of polyether modified polysiloxane, 0.5% of sodium carboxymethylcellulose, 3% of glyceryl monostearate, 1% of polyepoxysuccinic acid, 6% of isomeric tridecanol polyoxyethylene ether, 3% of oleic acid polyoxyethylene ester and 56.5% of water.
The embodiment also provides a preparation method of the defoaming agent for evaporating the landfill leachate, which comprises the following steps:
(1) weighing 0.85 part by weight of sodium carboxymethyl cellulose, putting the sodium carboxymethyl cellulose into 100 parts by volume of deionized water, stirring for 1 hour at the temperature of 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickening agent solution;
(2) adding sulfuric acid into the polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) weighing 57 parts by weight of the thickening agent obtained in the step (1), 30 parts by weight of polyether modified polysiloxane, 1 part by weight of polyepoxysuccinic acid obtained in the step (2), 3 parts by weight of glyceryl monostearate, 6 parts by weight of isomeric tridecanol polyoxyethylene ether and 3 parts by weight of oleic acid polyoxyethylene ester, stirring for 1h at the temperature of 50 ℃ and the rotating speed of 80r/min, cooling to normal temperature, and standing to obtain the defoaming agent.
Example 6
The embodiment provides a defoaming agent for evaporating landfill leachate, which comprises the following components in percentage by mass: 10% of polyether modified polysiloxane, 1.5% of sodium carboxymethylcellulose, 6% of glyceryl monostearate, 5% of polyepoxysuccinic acid, 10% of isomeric tridecanol polyoxyethylene ether, 1% of oleic acid polyoxyethylene ester and 66.5% of water.
The embodiment also provides a preparation method of the defoaming agent for evaporating the landfill leachate, which comprises the following steps:
(1) weighing 2.2 parts by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1 hour at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickening agent solution;
(2) adding sulfuric acid into the polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) weighing 68 parts by weight of the thickener obtained in the step (1), 10 parts by weight of polyether modified polysiloxane, 5 parts by weight of polyepoxysuccinic acid obtained in the step (2), 6 parts by weight of glyceryl monostearate, 10 parts by weight of isomeric tridecanol polyoxyethylene ether and 1 part by weight of oleic acid polyoxyethylene ester, stirring for 1h at the temperature of 50 ℃ and the rotating speed of 80r/min, cooling to normal temperature, and standing to obtain the defoaming agent.
Example 7
The embodiment provides a defoaming agent for evaporating landfill leachate, which comprises the following components in percentage by mass: 20% of polyether modified polysiloxane, 0.5% of sodium carboxymethylcellulose, 3% of glyceryl monostearate, 1% of polyepoxysuccinic acid, 6% of isomeric tridecanol polyoxyethylene ether, 4% of oleic acid polyoxyethylene ester and 66.5% of water.
The embodiment also provides a preparation method of the defoaming agent for evaporating the landfill leachate, which comprises the following steps:
(1) weighing 0.75 part by weight of sodium carboxymethyl cellulose, putting the sodium carboxymethyl cellulose into 100 parts by volume of deionized water, stirring for 1 hour at the temperature of 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickening agent solution;
(2) adding sulfuric acid into the polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) weighing 66 parts by weight of the thickening agent obtained in the step (1), 20 parts by weight of polyether modified polysiloxane, 1 part by weight of polyepoxysuccinic acid obtained in the step (2), 3 parts by weight of glyceryl monostearate, 6 parts by weight of isomeric tridecanol polyoxyethylene ether and 4 parts by weight of oleic acid polyoxyethylene ester, stirring for 1h at the temperature of 50 ℃ and the rotating speed of 80r/min, cooling to normal temperature, and standing to obtain the defoaming agent.
Effect example 1
The test method for each property is as follows:
1. defoaming time and foam suppressing time: taking 100mL of landfill leachate of a certain refuse plant in Zhongshan city into a graduated glass tube, heating, placing into a bubbler for bubbling until the height of foam reaches 250mL, adding 100ppm of a defoaming agent, recording the foam elimination time t1, and recording as the defoaming time; continuing bubbling until the foam height reaches 250mL again, and recording the time t2 as the foam inhibition time;
2. scale inhibition: GB/T16632-2008 water treatment agent scale inhibition performance determination calcium carbonate deposition method;
the performance of the defoamers obtained in examples 1 to 7 was tested by the method described above, and the test results are shown in table 1.
TABLE 1
Note: the commercial product in Table 1 is WF-SC132 high temperature resistant defoamer from environmental control technology, Inc. of Simian Weiflei.
From the test data in table 1, the defoaming agent for evaporating landfill leachate of the present invention has good defoaming and foam suppressing properties, and has good scale inhibition.
Effect example 2
The effect example investigates the influence of the defoaming agent on the concentration multiple of the landfill leachate, sets the following test, and adopts example 3 in the test. The test method comprises the following steps: taking 1000mL of landfill leachate stock solution into a 1000mL beaker, adding zeolite, placing the beaker on an electric furnace, heating until the residual liquid is 50mL, namely concentrating by 20 times, and then comparing the effect of adding a test defoaming agent, wherein the test results are shown in figures 1-3.
Fig. 1 is landfill leachate stock solution, fig. 2 is landfill leachate concentrated 20 times without adding defoaming agent, and fig. 3 is landfill leachate concentrated 20 times with adding defoaming agent of example 3. Comparing with fig. 1-3, it can be known that the defoaming agent for landfill leachate evaporation of the present invention has good solubilization performance and good scale inhibition performance, and can increase the evaporation concentration multiple of landfill leachate.
Effect example 3
The effect example considers the influence of the mass ratio of the polyether modified polysiloxane and the solubilizer on the landfill leachate concentration multiple, and sets test groups 1-5, wherein the test groups 1-5 are the same as the example 3 except that the mass ratio of the polyether modified polysiloxane and the solubilizer is different from the example 3, and the ratio of the polyether modified polysiloxane and the solubilizer in the test groups 1-3 is shown in the following table 2.
The evaporation concentration multiple of the landfill leachate of the test groups 1-5 is tested, and the test method comprises the following steps: taking 1000mL of landfill leachate stock solution into a 1000mL beaker, adding zeolite, placing the beaker on an electric furnace, heating until the residual liquid has different volumes, stopping the test when scaling appears on the beaker, wherein the volume in the beaker is the final volume of the landfill leachate, and calculating the evaporation concentration multiple of the landfill leachate, wherein the calculation formula is as follows: and (4) the evaporation concentration multiple is equal to the volume of the landfill leachate stock solution/the final volume of the landfill leachate. The test results are shown in table 2.
TABLE 2
As can be seen from table 2, when the total amount of the polyether modified polysiloxane and the solubilizer is the same, the mass ratio of the polyether modified polysiloxane and the solubilizer has an influence on the evaporation concentration multiple of the landfill leachate, and when the mass ratio of the polyether modified polysiloxane to the solubilizer is 5: and when 1 hour, the evaporation concentration multiple of the landfill leachate is higher.
Finally, it should be noted that the above embodiments are intended to illustrate the technical solutions of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The defoaming agent for evaporating the landfill leachate is characterized by comprising the following components in percentage by mass: 10-30% of polyether modified polysiloxane, 0.5-1.5% of thickening agent, 1-5% of corrosion and scale inhibitor, 1-4% of wetting agent, 6-10% of penetrating agent, 3-6% of solubilizer and 50-80% of deionized water; the corrosion and scale inhibitor is polyepoxysuccinic acid or polyaspartic acid.
2. The defoamer according to claim 1, comprising the following components in mass percent: 20-25% of polyether modified polysiloxane, 0.5-0.8% of thickening agent, 2-3% of corrosion and scale inhibitor, 2-3% of wetting agent, 5-8% of penetrating agent, 3-4% of solubilizer and the balance of deionized water.
3. The defoamer according to claim 1, comprising the following components in mass percent: 25% of polyether modified polysiloxane, 0.6% of thickening agent, 3% of corrosion and scale inhibitor, 3% of wetting agent, 8% of penetrating agent, 4% of solubilizer and 56.4% of deionized water.
4. The defoamer of any one of claims 1-3, wherein said solubilizer is glycerol monostearate or glycerol dioleate.
5. The defoamer of any one of claims 1-3, wherein said thickener is sodium carboxymethyl cellulose or carboxymethyl cellulose.
6. The defoamer of any one of claims 1-3, wherein said wetting agent is polyoxyethylene oleate or polyoxyethylene stearate.
7. The defoamer of any one of claims 1-3, wherein said penetrant is a fatty alcohol polyoxyethylene ether or an isomeric tridecanol polyoxyethylene ether.
8. A method of preparing an antifoaming agent as claimed in any of claims 1 to 7, comprising the steps of:
(1) putting the thickening agent into water, heating and stirring to completely dissolve the thickening agent, and cooling to obtain a thickening agent solution;
(2) adjusting the pH value of the corrosion and scale inhibitor to be neutral by using sulfuric acid under stirring;
(3) weighing the thickener solution obtained in the step (1), the corrosion and scale inhibitor obtained in the step (2), the polyether modified polysiloxane, the wetting agent, the penetrating agent and the solubilizer in proportion, heating and stirring uniformly, and cooling to normal temperature to obtain the defoaming agent.
9. The method of claim 8, wherein the heating of step (1) is carried out at a temperature of 80 ℃ and for a stirring time of 1 hour.
10. The method of claim 8, wherein the heating in step (1) is carried out at a temperature of 50 ℃ and for a stirring time of 1 hour.
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