CN115093888A - Method for preparing water coke slurry by ultrasonically modifying sludge mixed with blue carbon powder - Google Patents
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
-
- 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
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/34—Applying ultrasonic energy
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- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Chemical & Material Sciences (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for preparing water coke slurry by mixing ultrasonic modified sludge with blue carbon powder, which comprises the steps of modifying and pretreating the sludge by an ultrasonic means, damaging a floccule structure of the sludge, adding a proper dispersing agent to prepare high-performance slurry, placing the sludge into an ultrasonic generating device for pretreatment, promoting the dispersion of the floccule structure of the sludge and the rupture of microbial cell walls in the sludge by utilizing the mechanical action of ultrasonic, releasing water in floccules and cells, reducing the particle density, promoting the decomposition of refractory organic matters and the release of organic matters, nitrogen and phosphorus in the process of ultrasonic action, improving the bioavailability of the organic matters, and then obtaining modified sludge; the semi-coke is divided into five different particle size grades through crushing, mixing, grinding and screening processes, a dry pulping process is adopted, the modified sludge and the semi-coke powder are mixed, then the modified sludge and the dispersant are uniformly mixed, and a pulping stirring device is used for fully stirring to obtain uniform sludge coke water slurry.
Description
Technical Field
The invention discloses a method for preparing water coke slurry by mixing ultrasonic modified sludge with semi-coke powder, and particularly relates to a technical method for preparing high-performance modified sludge water coke slurry by pretreating sludge by using ultrasonic, mixing the modified sludge, the semi-coke powder, a dispersing agent and water to prepare sludge water coke slurry, and crushing a sludge floccule structure by using ultrasonic mechanical action.
Background
Along with the continuous increase of the urban sewage yield in China, the urban sewage and sludge yield also increases sharply. Direct discharge of sewage sludge into soil or water bodies can cause serious environmental pollution and health problems if untreated or improperly treated. The sludge has high water content, is easy to rot and has strong odor, and contains a large amount of pathogenic bacteria, parasitic ova, heavy metals such as chromium and mercury, and toxic, harmful and carcinogenic substances such as dioxin which are difficult to degrade. Therefore, it is of great significance to find a cost-effective and environment-friendly way to treat sludge.
Therefore, it is of great significance to find a cost-effective and environment-friendly way to treat sludge. Coal water slurry is a highly concentrated suspension of coal fines dispersed in water. Coal water slurries should exhibit as high a solids loading as possible, good flow and stability in industrial applications. The novel method for sludge treatment is characterized in that sludge is added into coal water slurry to prepare sludge coal water slurry which can be used as boiler fuel or gasification feed, so that the requirement of sustainable development is met, the moisture and the heat value in the sludge are fully utilized, and the purpose of energy and resource utilization of the sludge is achieved. This method has a significant impact on the treatment of sewage sludge.
The blue charcoal resources in China are rich, but for blue charcoal powder with the granularity of less than 6mm, the blue charcoal powder is abandoned in river channels or the ground because the granularity does not meet the production requirements, or is directly sold as low-price fuel, so that the resource is greatly wasted. In order to prevent dust pollution and improve economic benefits, people have gradually explored the field of water coke slurry. The liquid fuel which is used as a new liquid fuel after the water-coal-slurry is also composed of 60-70% of semi-coke, 30-40% of water and 1-2% of additives. The method for preparing water coke slurry by mixing sludge is a new method for treating sludge. The method not only eliminates harmful microorganisms and solidifies heavy metals in the sludge, but also fully utilizes the moisture and the heat value of the sludge, and has important significance for sludge energy regeneration and recycling.
In addition, because the sludge floc structure is developed and the water interception force is strong, water is easy to be bound in the floc, so that free water is reduced, and the fluidity of slurry is poor; the developed floc structure also stores a large amount of gas, reducing the service life of the slurry. Therefore, in order to destroy the floc structure of the sludge, an ultrasonic means is adopted for modification pretreatment; in order to effectively exert the effect of the additive, the blue carbon powder is used as a raw material and a proper dispersant is selected. Based on the modified sludge water coke slurry, the preparation process of the modified sludge water coke slurry with complete system is realized.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides the method for preparing the water coke slurry by ultrasonically modifying the sludge and mixing the blue carbon powder, obviously improves the slurry performance, lays a theoretical foundation for the application and popularization of subsequent slurry, carries out modification pretreatment on the sludge by ultrasonic means, destroys the floccule structure of the sludge, and adds a proper dispersant to prepare the high-performance slurry.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for preparing water coke slurry by ultrasonically modifying sludge mixed with blue carbon powder comprises the following steps:
firstly, sludge is put into an ultrasonic generating device for pretreatment, the mechanical action of ultrasonic waves is utilized to promote the dispersion of sludge floccule structures and the rupture of microbial cell walls in the sludge, release water in the floccules and cells, reduce the particle density, promote the decomposition of refractory organic matters and the release of organic matters, nitrogen and phosphorus in the process of the action of the ultrasonic waves, improve the bioavailability of the organic matters, and then obtain modified sludge;
secondly, dividing the Shanbei Shenfu semi-coke powder into five different particle size grades of 20-40 meshes, 40-120 meshes, 120-200 meshes, 200-325 meshes and more than 325 meshes through crushing, mixing, grinding and screening according to the particle size grading of the Texaco gasification process;
and thirdly, adopting a dry pulping process, mixing the modified sludge in the first step with the semi-coke powder in the second step, uniformly mixing the modified sludge with water and a dispersing agent, and fully stirring the mixture by using a pulping stirring device to obtain uniform sludge coke water slurry.
The operating conditions of the ultrasonic wave generating device are as follows: the frequency is 27kHz, the amplitude is 50%, the current is 0.35A, and the ultrasonic time is 60-240 min.
The raw material components of the sludge water coke slurry have the following mass ratio relationship,
adopting dried sludge: dry semi coke powder 10:100, dispersant: dry semi-coke powder is 0.8: 100.
The sludge is a product obtained after mechanical dehydration of an urban sewage treatment plant, and the water content of the sludge is 90%.
The pulping dispersant adopts an anion compound dispersant, and the mass ratio of the naphthalene sulfonic acid formaldehyde polymer sodium salt: and (3) the polycarboxylate water reducing agent is 0.5: 0.5.
The finished product of the sludge water coke slurry is prepared by blue carbon powder, modified sludge, a dispersant and water.
Compared with the prior art, the invention has the beneficial effects that: the invention utilizes ultrasonic waves to modify sludge, increases the negative charge quantity on the surface of sludge particles, exposes the sludge to the action of ultrasonic waves to destroy flocs and microorganism cell walls and release water in the flocs and the cells, improves the particle density, then mixes the modified sludge, the semi coke powder, the dispersant and the distilled water to prepare the coke water slurry, can obviously reduce the apparent viscosity of the coke water slurry of the sludge, improves the slurry concentration, the stability and the fluidity of the coke water slurry of the sludge, and obtains the coke water slurry of the sludge with excellent performance. The invention adopts low-frequency ultrasonic wave to pretreat the modified sludge, has low energy consumption, short pretreatment time, simple method and easy realization; the apparent viscosity can be reduced by more than 42 percent, the slurry concentration is increased by more than 1.7 percent, the water precipitation rate is reduced to 0 percent, the fluidity is linear, and no precipitate is generated after standing for 7 d; the pulping performance of the sludge coke water slurry is improved, the pulping concentration is improved, the energy and resource utilization of the sludge is realized, and the requirement of sustainable development is met.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of a process flow for preparing sludge water coke slurry by mixing ultrasonic modified sludge, blue carbon powder, a dispersant and water.
FIG. 2 is a schematic diagram showing the effect of ultrasonically modified sludge on rheological properties of sludge-water coke slurry in the present invention.
FIG. 3 is a schematic diagram showing the effect of modified sludge on the maximum slurry concentration of the sludge-water coke slurry in the present invention.
Detailed Description
As shown in figures 1, 2 and 3, the invention utilizes ultrasonic to modify sludge, the negative charge amount on the surface of sludge particles is increased, the sludge is exposed to ultrasonic to destroy flocs and microbial cell walls and release water in the flocs and cells, the particle density is improved, and then the modified sludge is mixed with blue carbon powder, a dispersing agent and distilled water to prepare the water coke slurry, so that the apparent viscosity of the sludge water coke slurry can be obviously reduced, the slurry forming concentration, the stability and the fluidity of the sludge water coke slurry are improved, and the sludge water coke slurry with excellent performance is obtained.
Example 1
The sludge is taken from mechanically dewatered sludge produced by a certain sewage treatment plant, and the mechanically dewatered sludge is put into an oven for drying and is used for ultrasonic modification and preparation of subsequent sludge water coke slurry. An ultrasonic treatment system in a multifunctional microwave synthesis extraction instrument is adopted, and the device consists of an ultrasonic vibration head, a driving power box and a fixed sleeve. The frequency of the ultrasound was controlled at 27kHz, the amplitude at 50% and the current at 0.35A, setting the sonication time at 60, 120, 180 and 240 min.
When the modified sludge is mixed with the semi-coke powder to prepare the sludge coke water slurry, the mass ratio of the raw material components is as follows: dried sludge: dry semi coke powder 10:100, dispersant: dry semi coke powder 0.8: 100. The dispersant is selected from an anionic compound dispersant (naphthalene sulfonic acid formaldehyde polymer sodium salt: polycarboxylate water reducing agent: 0.5). The solid mass concentration of the prepared sludge water coke slurry is 65 percent.
The apparent viscosity of the slurry was measured using a rotational viscometer.
As shown in FIG. 2, the effect of ultrasonically modifying the sludge on the rheology of the sludge-water coke slurry. As can be seen in FIG. 2, the apparent viscosity of the sludge coke water slurry decreases with increasing shear rate, showing shear thinning behavior, with the characteristics of a pseudoplastic fluid. High viscosity increases the difficulty of particle settling at low shear rates, low viscosity reduces transportation costs at high shear rates, and pseudoplastic behavior is also critical in preventing clogging of atomizing nozzles. Therefore, the addition of the modified sludge has positive influence on the pseudoplastic behavior of the sludge coke water slurry, and the apparent viscosity of the slurry is obviously reduced; with increasing shear rate, the apparent viscosity gradually decreased, appearing as a pseudoplastic fluid. The rheological property of the sludge coke water slurry can be obviously improved by adding the modified sludge.
The rheological property of the water coke slurry is an important index for evaluating the water coke slurry, and has great influence on storage, transportation and the like. The rheology of the modified sludge coke water slurry was described using the Herschel-Bulkley model.
The calculation formula is as follows: τ ═ τ 0 +K·γ n ；
In the formula: n-rheological coefficient, representing the degree of deviation of semi-coke slurry from Newtonian fluid;
k-consistency factor, Pa · s n ；
τ -shear stress, Pa;
gamma-shear rate, s -1 ；
τ 0 Yield stress, Pa.
When n is less than 1, the slurry is pseudoplastic fluid with shear thinning; when n is more than 1, the slurry is a plastic swelling fluid with shear thickening; if n is 1, the fluid is Newtonian. Generally, the greater the concentration of the slurry, the greater the value of K, and the smaller the value of n, the more pronounced the pseudoplasticity. From the parameter changes in Table 1, it can be seen that the value of the rheology index n of the modified sludge coke water slurry is less than 1, indicating that the slurry is a pseudoplastic fluid. In addition, the consistency coefficient K of the sludge water coke slurry changes along with different ultrasonic time of the sludge; at an ultrasonic time of 240min, the value of the rheological index n is the largest, and the value of the consistency coefficient K is the smallest, because a stable space structure is formed between organic substances and water molecules in the modified sludge, and the relative movement of solid particles is hindered.
TABLE 1 ultrasonic modified sludge preparation sludge water coke slurry rheological model fitting parameters
In order to further research the influence of the modified sludge on the apparent viscosity and stability of the sewage coke slurry. As can be seen from Table 2, the apparent viscosity of the sludge coke slurry prepared from the raw sludge is 711.2mPas, the water precipitation rate in 7 days is 6.09%, hard precipitate is generated, and the stability is poor. The apparent viscosity of the sludge water coke slurry is obviously reduced by adding the modified sludge, the water precipitation rate value in 7 days is 0 percent, and no hard precipitate is generated. When the ultrasonic time is 240min, the apparent viscosity of the sludge coke water slurry prepared from the modified sludge is 407.8mPas, and the slurry viscosity is reduced by 42 percent compared with that of the original sludge coke water slurry. Untreated raw sludge floccules are loose in structure, have rich internal void structures and are high in water retaining capacity, a large number of cell structures and microorganisms are contained in the raw sludge, untreated sludge is mixed with semi-coke powder to prepare the coke water slurry, and sludge particles, semi-coke particles and water molecules form a network structure to improve the stability of slurry, but water still easily enters the floccules of the sludge, so that the pulping capacity is poor. When the sludge is under the action of ultrasonic waves, the floccule structure of the sludge is decomposed, the cell walls of microorganisms are broken, water in cell tissues is released, the pore structure of the sludge is changed, the granularity is reduced, and the particle size grading is facilitated. A large number of oxygen-containing functional groups exist on the surface of the modified sludge particles, and form stable hydrogen bonds with water and form a hydration film with the semi-coke powder particles, so that aggregation and precipitation among the semi-coke particles are effectively prevented.
TABLE 2 influence of ultrasonically modified sludge on the pulping effect of the sludge-water coke slurry
Example 2
The sludge is taken from mechanically dehydrated sludge produced by a certain sewage treatment plant, the mechanically dehydrated sludge is placed into an oven for drying, and the sludge is used for ultrasonic modification and subsequent preparation of sludge coke water slurry, and like the example 1, an ultrasonic treatment system in a multifunctional microwave synthesis extraction instrument is adopted, and the device consists of an ultrasonic vibration head, a driving power box and a fixing sleeve. The ultrasonic frequency was controlled at 27kHz, amplitude at 50% and current at 0.35A, and the sonication time was set at 240 min.
When the modified sludge is mixed with the semi-coke powder to prepare the sludge coke water slurry, the mass ratio of the raw material components is as follows: dried sludge: dry semi coke powder 10:100, dispersant: dry semi coke powder 0.8: 100. The dispersant is selected from an anionic compound dispersant (naphthalene sulfonic acid formaldehyde polymer sodium salt: polycarboxylate water reducing agent: 0.5). The solid mass concentration of the prepared sludge water coke slurry is 63%, 65%, 67% and 69%.
The apparent viscosity of the slurry was measured using a rotational viscometer.
In this example, raw sludge and modified sludge were mixed with semi-coke powder to prepare a sludge coke water slurry and a modified sludge coke water slurry, and the maximum slurry concentration was measured, and the results are shown in FIG. 3. Similar increasing trends are shown as the concentration of the sludge coke water slurry and the modified sludge coke water slurry increases. The maximum slurry concentration of the original sludge and the semi-coke powder after being mixed is increased to 66.7 percent, and the maximum slurry concentration of the modified sludge and the semi-coke powder after being mixed is increased to 68.4 percent; the addition of the modified sludge is shown to have a remarkable influence on the pulp forming performance of the coke water slurry, and the floccule structure of the sludge is the main reason for influencing the pulp forming performance of the coke water slurry. The sludge floc has strong hydrophilicity and rich internal pores, and the characteristics ensure that the sludge has strong water interception capability, more water is intercepted in the sludge floc, and the intercepted water cannot flow freely; the floc structure is damaged after the sludge is modified, and the intercepted water can be released, so that the proportion of the free water of the water coke slurry system is increased. Thus, a high-concentration slurry can be prepared.
Example 3
The sludge is taken from mechanically dewatered sludge produced by a certain sewage treatment plant, the mechanically dewatered sludge is put into an oven for drying, the method is used for ultrasonic modification and subsequent preparation of sludge water coke slurry, modified sludge and original sludge subjected to ultrasonic pretreatment for 240min are used for an adsorption test, NNO/PCE dispersant solution with the concentration of 1000mg/L is prepared, 1g of sludge and 50mL of dispersant solution are accurately weighed and mixed in a 100mL conical flask, primarily stirring with a glass rod, placing in a constant temperature water bath oscillator, setting the water bath temperature at 25 deg.C and the oscillation rate at 150rpm, respectively oscillating for 1, 2, 5, 8, 10, 20, 30, 60, 120, 240, 300, and 360min, then the suspension sample is kept still for 30min, the upper layer liquid with proper volume is transferred into a centrifuge tube, centrifuging at 8000rpm for 10min with high speed centrifuge twice, and separating supernatant. Calculating each adsorption amount, and comparing the adsorption amounts at different times.
The relationship between the adsorption amount at which adsorption reaches equilibrium and the equilibrium concentration of the solution can be represented by an adsorption isotherm. Through the research on the adsorption isotherm of the dispersant on the surface of the modified sludge, the adsorption efficiency of the modified sludge particles on the dispersant and the maximum adsorption degree which can be achieved are obtained, and the adsorption rule of the dispersant on the modified sludge particles is revealed. The experiment investigates the isothermal adsorption rule of the modified sludge particle surface to the dispersant at 25 ℃. The concentration of the dispersing agent is controlled to be 0-2000 mg/L, including 100, 200, 300, 400, 500, 600, 800, 1000, 1500 and 2000mg/L, and the adsorption time is 360 min.
The adsorption capacity was measured with a UV-2000 type UV-Vis spectrophotometer.
In the embodiment, the dispersant molecules can be adsorbed on the surface of the sludge particles, so that the surface property of the sludge particles is changed, the free energy is reduced, and a hydration membrane with a certain thickness is formed, thereby effectively enhancing the steric hindrance of the sludge water-coke slurry and reducing the viscosity of the slurry. With the increase of the concentration of the dispersing agent, the adsorption capacity of the dispersing agent begins to rapidly increase, and then reaches a platform at high concentration to present a single-layer adsorption characteristic; the isothermal saturated adsorption capacity of the surfaces of the sludge and the modified sludge particles to dispersant molecules is 8.541mg/g and 8.783mg/g respectively; the influence of the adsorption time on the adsorption quantity is 8.336mg/g of sludge and 8.731mg/g of modified sludge respectively; the ultrasonic modification can improve the adsorption capacity of sludge particles to the dispersant, so as to improve the pulping performance of the slurry.
The present invention has been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art.
Claims (6)
1. A method for preparing water coke slurry by ultrasonically modifying sludge mixed with blue carbon powder is characterized by comprising the following steps:
firstly, sludge is put into an ultrasonic generating device for pretreatment, the mechanical action of ultrasonic waves is utilized to promote the dispersion of sludge floccule structures and the rupture of microbial cell walls in the sludge, release water in the floccules and cells, reduce the particle density, promote the decomposition of refractory organic matters and the release of organic matters, nitrogen and phosphorus in the process of the action of the ultrasonic waves, improve the bioavailability of the organic matters, and then obtain modified sludge;
secondly, dividing the Shanbei Shenfu semi-coke powder into five different particle size grades of 20-40 meshes, 40-120 meshes, 120-200 meshes, 200-325 meshes and more than 325 meshes through crushing, mixing, grinding and screening according to the particle size grading of the Texaco gasification process;
and thirdly, adopting a dry pulping process, mixing the modified sludge in the first step with the semi-coke powder in the second step, uniformly mixing the modified sludge with water and a dispersing agent, and fully stirring the mixture by using a pulping stirring device to obtain uniform sludge coke water slurry.
2. The method for preparing water coke slurry by using the ultrasonic modified sludge mixed blue carbon powder according to claim 1, wherein the operating conditions of the ultrasonic generating device are as follows: the frequency is 27kHz, the amplitude is 50%, the current is 0.35A, and the ultrasonic time is 60-240 min.
3. The method for preparing water coke slurry by mixing ultrasonic modified sludge with blue carbon powder according to claim 1, wherein the raw material components of the sludge water coke slurry have the following mass ratio relationship,
adopting dried sludge: dry semi-coke powder is 10:100, dispersant: dry semi coke powder 0.8: 100.
4. The method for preparing water coke slurry by mixing ultrasonic modified sludge with blue carbon powder as claimed in claim 1, wherein the sludge is a mechanically dewatered product of a municipal sewage treatment plant, and the water content of the sludge is 90%.
5. The method for preparing water coke slurry by using the ultrasonic modified sludge mixed with the blue carbon powder as claimed in claim 1, wherein the pulping dispersant is an anion compound dispersant, and the mass ratio of the sodium salt of the naphthalene sulfonic acid formaldehyde polymer: and (3) the polycarboxylate water reducing agent is 0.5: 0.5.
6. The method for preparing coke water slurry by mixing blue charcoal powder with ultrasonically modified sludge according to claim 1, wherein the finished product of the sludge coke water slurry is prepared by using blue charcoal powder, modified sludge, a dispersing agent and water.
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| CN106190375A (en) * | 2016-08-17 | 2016-12-07 | 中国石化长城能源化工（宁夏）有限公司 | A kind of industry Ramsbottom carbon powder and biochemical sludge are mixed with water-coal-slurry method |
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| CN107267235A (en) * | 2017-06-27 | 2017-10-20 | 中煤科工清洁能源股份有限公司 | A kind of method that many raw materials prepare novel water-coal-slurry product |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106190375A (en) * | 2016-08-17 | 2016-12-07 | 中国石化长城能源化工（宁夏）有限公司 | A kind of industry Ramsbottom carbon powder and biochemical sludge are mixed with water-coal-slurry method |
| CN107022387A (en) * | 2017-04-20 | 2017-08-08 | 福建清源科技有限公司 | A kind of sludge water-coal-slurry of sludge height incorporation and preparation method thereof |
| CN107164003A (en) * | 2017-04-21 | 2017-09-15 | 华北电力大学（保定） | Improve the method for sludge water-coal-slurry paste-forming properties using ultrasonic wave breaking sludge floc sedimentation |
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