CN111646671A - Method for cooperatively treating sludge by using cement kiln - Google Patents
Method for cooperatively treating sludge by using cement kiln Download PDFInfo
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- CN111646671A CN111646671A CN202010556645.9A CN202010556645A CN111646671A CN 111646671 A CN111646671 A CN 111646671A CN 202010556645 A CN202010556645 A CN 202010556645A CN 111646671 A CN111646671 A CN 111646671A
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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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
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
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- F23G2209/12—Sludge, slurries or mixtures of liquids
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Abstract
The invention relates to the field of environmental protection, in particular to a method for cooperatively treating sludge by a cement kiln; the method comprises the following steps: pretreating, degrading, drying and incinerating the sludge; according to the invention, the acidifying agent, the flocculating agent and the decomposing agent are added into the sludge, so that the sludge dewatering difficulty is reduced; the main principle is that the surface property of the sludge is changed by adding the acidifying agent and the flocculating agent, and then a polymer decomposition auxiliary agent is added to decompose a large amount of extracellular polymers contained in the sludge, enhance the penetrability of water between cell walls and cell membranes, release interstitial water and enhance the dehydration effect; the invention mainly solves the problem of large smoke generated after incineration due to difficult sludge dehydration, and then the sludge is incinerated by utilizing high-temperature hot gas generated by incineration at the kiln head of the cement rotary kiln through cooperative treatment with the cement kiln, and the incinerated sludge residue can also be utilized in cement production, thereby achieving the effects of comprehensive utilization and treatment and having very environmental protection value.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a method for cooperatively treating sludge by a cement kiln.
Background
With the development of industry in China and the construction of cities, a large amount of sludge is inevitably generated in the wastewater treatment process, the sludge contains a large amount of heavy metal ions, pathogenic bacteria and other harmful substances besides high organic matter content, has the characteristics of high water content, large volume, complex shape, difficult transportation and the like, needs to be treated by a proper method, and otherwise threatens human life.
CN110709357A discloses a method of treating sludge derived from sewage or wastewater, the method comprising subjecting the sludge to a treatment step having a pH of 8.9 or higher and a Free Ammonia (FA) content of 100mg NH3-N/L or higher. The treated sludge may be fed to a bioreactor to produce methane.
CN107285580B discloses a sludge treatment method, which comprises: step 1: acidizing; step 2: mechanical dehydration, namely dehydrating the acidified sludge through a squeezer; and step 3: carrying out incineration treatment, namely conveying the dewatered sludge to an incinerator and mixing and incinerating the sludge with a combustion improver; and 4, step 4: and (4) tail gas treatment, wherein tail gas generated after sludge is incinerated is treated and then is discharged. The sludge treatment method carries out pretreatment, reduces the content of ECP in the sludge, and improves the dehydration effect of the sludge during mechanical dehydration.
CN107188384A discloses a sludge treatment method, which comprises the following steps: and (3) oxidizing the sludge by adopting persulfate under an acidic condition to finish the treatment of the sludge. According to the treatment method, the persulfate is adopted to treat the sludge under the acidic condition, so that the dehydration performance of the sludge can be improved, the heavy metal content in the sludge can be reduced, the treatment method has the advantages of simple and convenient process, convenience in operation, less required equipment, low operation cost, convenience in large-scale industrial production and the like, the reduction, stabilization, harmlessness and subsequent resource utilization of the sludge are realized, and the treatment method has a good application prospect.
The above methods and the prior patents have the advantage that the sludge is dehydrated during the sludge treatment, but the sludge contains a large amount of extracellular polymers, and the high molecular substances generated by the microorganisms influence the dehydration effect, so that the water content of the sludge is higher, and a large amount of smoke is generated.
Disclosure of Invention
In order to solve the problems, the invention provides a method for cooperatively treating sludge by a cement kiln.
A method for cooperatively treating sludge by a cement kiln mainly comprises the following steps:
a, pretreating sludge, namely mechanically dehydrating the sludge at first, keeping the water content of the sludge at 35-58%, then adding the dehydrated sludge into a mixing bin, adding 1-3.8% of an acidifying agent, 0.5-4.5% of a flocculating agent and 0.1-0.6% of a decomposing agent, and mixing and stirring for 20-30 min;
b, degrading and drying, namely placing the uniformly mixed sludge at normal temperature for 5-10h, then putting the sludge into drying equipment, controlling the temperature to be 120-240 ℃, drying for 30-60min, measuring the water content of the sludge, and crushing the dried sludge into 20-50-mesh particles after the moisture content is measured;
and C, burning, namely adding 10-20% of combustion improver into the obtained sludge particles, sending the sludge particles to a decomposing furnace, burning the sludge particles by high-temperature gas of the decomposing furnace, doping the obtained sludge residues into cement raw materials according to the mass ratio of 20-35%, and adding the sludge residues into a rotary kiln to serve as raw materials for cement production.
The decomposing agent is a polymer decomposing auxiliary agent and adopts straw powder as a raw material;
after chlorination, the straw powder is condensed with methyl silanetriol to generate a silicon-based chlorinated straw material;
the decomposing agent is a polymer decomposing auxiliary agent generated by condensation reaction of silicon-based chlorinated straw materials, lanthanum phosphate and semicarbazide.
A chlorinated straw material is prepared by the following steps:
adding 50-80 parts of straw powder into 5-10 parts of zinc chloride and 320 parts of hydrochloric acid with the mass percent concentration of 10-15% according to the mass parts, stirring for 2-5h, filtering, washing with water until the pH value is =7, filtering, and drying to obtain a chlorinated straw material;
the equation for the partial reaction is shown below:
a silicon-based chlorinated straw material is prepared by the following steps:
then uniformly mixing the silicon-based chlorinated straw material with 6-13 parts of methylsilanetiol and 100-200 parts of water, controlling the temperature at 60-75 ℃, stirring for 3-7h, drying, grinding into powder of 50-70 meshes after drying, and obtaining the silicon-based chlorinated straw material;
the equation for the partial reaction is shown below:
a polymer decomposition aid is prepared by the following steps:
according to the mass portion, 5.6-9.7 portions of lanthanum phosphate and 180 portions of 150-60 ℃ of water are uniformly mixed, formic acid is added, the pH value of the solution is adjusted to be 6.2-8.5, the temperature is controlled to be 40-60 ℃, the reaction is carried out for 120-180min, then the temperature is controlled to be 70-80 ℃ in a high-pressure reaction kettle, the reaction is carried out for 8-20h, 50-70 portions of silicon-based chlorinated straw material and 10-20 portions of semicarbazide are added after the reaction is finished, the pH value is adjusted to be 1.4-3.1, the temperature is controlled to be 70-80 ℃, the reaction is carried out for 120-180min, 0.1-0.5mol/L of sodium hydroxide solution is added after the reaction is finished, the pH value is 6-8, the stirring is carried out for 30-60min, then the filtration is carried out, the filtered solid is heated to 150-180 ℃, the temperature is kept for 20-60 min.
The equation for the partial reaction is shown below:
the acidifying agent is hydrochloric acid or oxalic acid or acetic acid.
The flocculant is polyacrylamide, polyaluminium chloride or polyferric chloride which are polymeric flocculant.
High-temperature hot gas generated by burning the kiln head of the rotary cement kiln is sent into the decomposing furnace through the grate cooler to decompose the sludge.
The combustion improver is coal ash or waste paper scrap or coke.
The decomposition temperature of the decomposition furnace is 1000-1200 ℃.
The polymer decomposition auxiliary agent interacts with transport protein or phospholipid on the extracellular polymer cell membrane, so that the activity of the transport protein and the size of a membrane channel are changed, the active or passive transport capacity of the membrane is improved, and the fluidity and the permeability of the extracellular polymer cell membrane are improved.
The invention relates to a method for cooperatively treating sludge by a cement kiln, in particular to a method for cooperatively treating sludge by a cement kiln, which reduces the difficulty of sludge dehydration by adding an acidifying agent, a flocculating agent and a decomposing agent into the sludge; the main principle is that the surface property of the sludge is changed by adding the acidifying agent and the flocculating agent, and then a polymer decomposition auxiliary agent is added to decompose a large amount of extracellular polymers contained in the sludge, enhance the penetrability of water between cell walls and cell membranes, release interstitial water and enhance the dehydration effect; the invention mainly solves the problem of large smoke generated after incineration due to difficult sludge dehydration, and then the sludge is incinerated by utilizing high-temperature hot gas generated by incineration at the kiln head of the cement rotary kiln through cooperative treatment with the cement kiln, and the incinerated sludge residue can also be utilized in cement production, thereby achieving the effects of comprehensive utilization and treatment and having very environmental protection value.
Drawings
FIG. 1 is a Fourier infrared spectrum of a sample of the polymeric decomposition aid prepared in example 3:
at 2918cm-1A telescopic absorption peak of hydrocarbon exists nearby and is 725cm-1The expansion absorption peak of silicon carbon exists nearby, and is 1109cm-1An antisymmetric telescopic absorption peak of ether exists nearby, which indicates that the silicon-based chlorinated straw material participates in the reaction; at 1728cm-1The absorption peak of carbonyl group at 1076cm is observed-1An antisymmetric telescopic absorption peak of a carbon-nitrogen single bond exists nearby, which indicates that semicarbazide participates in the reaction; at 1175cm-1An absorption peak of phosphorus-oxygen bonds exists nearby, which indicates that lanthanum phosphate participates in the reaction; at 3000cm-1No obvious hydroxyl absorption peak nearby, which indicates that lanthanum phosphate and hydroxyl have dehydration condensation reaction at 750cm-1And no obvious carbon-chlorine absorption peak is formed nearby, which indicates that the semicarbazide and the carbon-chlorine bond are subjected to dehydrochlorination reaction.
Detailed Description
The invention is further illustrated by the following specific examples:
10.00g of sludge is weighed and taken by the experimental sludge water content determination filter paper, is transferred into an oven to be dried at the temperature of 103-105 ℃ for half an hour, is taken out and is placed in a drier to be cooled to room temperature, and the weight of the filter paper is weighed. And (5) repeatedly drying, cooling and weighing until the weight difference of the two times of weighing is less than or equal to 0.2mg, and calculating the water content. The experiment measures the content of dioxin and furan in the burned flue gas according to the Chinese standard GWKB 3-2000.
Example 1
A method for cooperatively treating sludge by a cement kiln mainly comprises the following steps:
a, pretreating sludge, namely mechanically dehydrating the sludge at first, keeping the water content of the sludge at 35%, then adding the dehydrated sludge into a mixing bin, adding 1% of an acidifying agent, 0.5% of a flocculating agent and 0.1% of a decomposing agent, and mixing and stirring for 20 min;
b, degrading and drying, placing the uniformly mixed sludge for 5 hours at normal temperature, then putting the sludge into drying equipment, controlling the temperature at 120 ℃, drying for 30min, measuring the water content of the sludge, and crushing the dried sludge into 20-mesh particles after the drying is finished;
and C, burning, namely adding 10% of combustion improver into the obtained sludge particles, conveying the sludge particles to a decomposing furnace, burning the sludge particles by high-temperature gas of the decomposing furnace, doping the obtained sludge residues into cement raw materials according to the mass ratio of 20%, and adding the sludge residues into a rotary kiln to serve as raw materials for cement production.
The preparation method of the silicon-based chlorinated straw material comprises the following steps:
adding 50g of straw powder into 5g of zinc chloride and 200g of hydrochloric acid with the mass percentage concentration of 10%, stirring for 2h, filtering, washing with water until the pH value is =7, filtering, drying to obtain a chlorinated straw material, then uniformly mixing with 6g of methylsilanetiol and 100g of water, controlling the temperature at 60 ℃, stirring for 3h, drying, grinding into powder of 50 meshes to obtain a silicon-based chlorinated straw material;
the decomposing agent is a polymer decomposing auxiliary agent, and the preparation method comprises the following steps:
uniformly mixing 5.6g of lanthanum phosphate and 150g of water, adding formic acid, adjusting the pH value of the solution to 6.2, controlling the temperature to 40 ℃, reacting for 120min, controlling the temperature to 70 ℃ in a high-pressure reaction kettle, reacting for 8h, adding 50g of silicon-based chlorinated straw material and 10g of semicarbazide after the reaction is completed, adjusting the pH value to 1.4, controlling the temperature to 70 ℃, reacting for 120min, adding 0.1mol/L of sodium hydroxide solution to neutralize the pH value to 6 after the reaction is completed, stirring for 30min, filtering, heating the filtered solid to 150 ℃, preserving the temperature for 20min, crushing and grinding after the reaction is completed, thereby obtaining the polymer decomposition aid.
The acidifying agent is hydrochloric acid.
The flocculant is a polymeric flocculant polyacrylamide.
High-temperature hot gas generated by burning the kiln head of the rotary cement kiln is sent into the decomposing furnace through the grate cooler to decompose the sludge.
The combustion improver is coal ash.
The decomposition temperature of the decomposing furnace is 1000 ℃.
The water content of the sludge treated by the experiment is 12.1 percent, and the content of dioxin and furan in the flue gas after incineration is 0.017ng/m3。
Example 2
A method for cooperatively treating sludge by a cement kiln mainly comprises the following steps:
a, pretreating sludge, namely mechanically dehydrating the sludge at first, keeping the water content of the sludge at 45%, then adding the dehydrated sludge into a mixing bin, adding 2.3% of an acidifying agent, 2.5% of a flocculating agent and 0.4% of a decomposing agent, and mixing and stirring for 25 min;
b, degrading and drying, placing the uniformly mixed sludge for 8 hours at normal temperature, then putting the sludge into drying equipment, controlling the temperature at 180 ℃, drying for 40min, measuring the water content of the sludge, and crushing the dried sludge into particles of 30 meshes after the moisture content is measured;
and C, burning, namely adding 15% of combustion improver into the obtained sludge particles, conveying the sludge particles to a decomposing furnace, burning the sludge particles by high-temperature gas of the decomposing furnace, doping the obtained sludge residues into cement raw materials according to the mass ratio of 25%, and adding the sludge residues into a rotary kiln to serve as raw materials for cement production.
The preparation method of the silicon-based chlorinated straw material comprises the following steps:
adding 74g of straw powder into 7g of zinc chloride and 280g of hydrochloric acid with the mass percent concentration of 12%, stirring for 3h, filtering, washing with water until the pH value is =7, filtering, drying to obtain a chlorinated straw material, then uniformly mixing with 11g of methylsilanetiol and 120g of water, controlling the temperature at 68 ℃, stirring for 6h, drying, grinding into 55-mesh powder to obtain a silicon-based chlorinated straw material;
the decomposing agent is a polymer decomposing auxiliary agent, and the preparation method comprises the following steps:
uniformly mixing 8g of lanthanum phosphate and 165g of water, adding formic acid, adjusting the pH value of the solution to 7, controlling the temperature to 50 ℃, reacting for 170min, controlling the temperature to 72 ℃ in a high-pressure reaction kettle, reacting for 11h, adding 60g of silicon-based chlorinated straw material and 15g of semicarbazide after the reaction is completed, adjusting the pH value to 2, controlling the temperature to 75 ℃, reacting for 150min, adding 0.2mol/L of sodium hydroxide solution to neutralize the pH value to 7, stirring for 45min, filtering, heating the filtered solid to 160 ℃, preserving heat for 50min, crushing and grinding after the reaction is completed, thereby obtaining the polymer decomposition aid.
The acidifier is oxalic acid.
The flocculant is polymeric flocculant polyaluminium chloride.
High-temperature hot gas generated by burning the kiln head of the rotary cement kiln is sent into the decomposing furnace through the grate cooler to decompose the sludge.
The combustion improver is waste paper scraps.
The decomposition temperature of the decomposing furnace is 1100 ℃.
The water content of the sludge treated by the experiment is 8.6 percent, and the content of dioxin and furan in the flue gas after incineration is 0.014ng/m3。
Example 3
A method for cooperatively treating sludge by a cement kiln mainly comprises the following steps:
a, pretreating sludge, namely mechanically dehydrating the sludge at first, keeping the water content of the sludge at 58%, then adding the dehydrated sludge into a mixing bin, adding 3.8% of an acidifying agent, 4.5% of a flocculating agent and 0.6% of a decomposing agent, and mixing and stirring for 30 min;
b, degrading and drying, placing the uniformly mixed sludge at normal temperature for 10h, then putting the sludge into drying equipment, controlling the temperature to be 240 ℃, drying for 60min, measuring the water content of the sludge, and crushing the dried sludge into 50-mesh particles after the drying is finished;
and C, burning, namely adding 20% of combustion improver into the obtained sludge particles, conveying the sludge particles to a decomposing furnace, burning the sludge particles by high-temperature gas of the decomposing furnace, doping the obtained sludge residues into cement raw materials according to the mass ratio of 35%, and adding the sludge residues into a rotary kiln to serve as raw materials for cement production.
The preparation method of the silicon-based chlorinated straw material comprises the following steps:
adding 80g of straw powder into 10g of zinc chloride and 320g of hydrochloric acid with the mass percentage concentration of 15%, stirring for 5h, filtering, washing with water until the pH value is =7, filtering, drying to obtain a chlorinated straw material, then uniformly mixing with 13g of methylsilanetiol and 200g of water, controlling the temperature to be 75 ℃, stirring for 7h, drying, grinding into powder of 70 meshes, and obtaining a silicon-based chlorinated straw material;
the decomposing agent is a polymer decomposing auxiliary agent, and the preparation method comprises the following steps:
uniformly mixing 9.7g of lanthanum phosphate and 180g of water, adding formic acid, adjusting the pH value of the solution to 8.5, controlling the temperature to 60 ℃, reacting for 180min, controlling the temperature to 80 ℃ in a high-pressure reaction kettle, reacting for 20h, adding 70g of silicon-based chlorinated straw material and 20g of semicarbazide after the reaction is completed, adjusting the pH value to 3.1, controlling the temperature to 80 ℃, reacting for 180min, adding 0.5mol/L of sodium hydroxide solution to neutralize the pH value to 8 after the reaction is completed, stirring for 60min, filtering, heating the filtered solid to 180 ℃, preserving the temperature for 60min, crushing and grinding after the reaction is completed, thereby obtaining the polymer decomposition aid.
The acidifying agent is acetic acid.
The flocculant is polymeric flocculant polyferric chloride.
High-temperature hot gas generated by burning the kiln head of the rotary cement kiln is sent into the decomposing furnace through the grate cooler to decompose the sludge.
The combustion improver is coke.
The decomposition temperature of the decomposing furnace is 1200 ℃.
The water content of the sludge treated by the experiment is 5.1 percent, and the content of dioxin and furan in the flue gas after incineration is 0.008ng/m3。
Comparative example 1
A method for cooperatively treating sludge by a cement kiln mainly comprises the following steps:
a, pretreating sludge, namely mechanically dehydrating the sludge at first, keeping the water content of the sludge at 35%, then adding the dehydrated sludge into a mixing bin, adding 1% of an acidifying agent and 0.5% of a flocculating agent, and mixing and stirring for 20 min;
b, degrading and drying, placing the uniformly mixed sludge for 5 hours at normal temperature, then putting the sludge into drying equipment, controlling the temperature at 120 ℃, drying for 30min, measuring the water content of the sludge, and crushing the dried sludge into 20-mesh particles after the drying is finished;
and C, burning, namely adding 10% of combustion improver into the obtained sludge particles, conveying the sludge particles to a decomposing furnace, burning the sludge particles by high-temperature gas of the decomposing furnace, doping the obtained sludge residues into cement raw materials according to the mass ratio of 20%, and adding the sludge residues into a rotary kiln to serve as raw materials for cement production.
The acidifying agent is hydrochloric acid.
The flocculant is a polymeric flocculant polyacrylamide.
High-temperature hot gas generated by burning the kiln head of the rotary cement kiln is sent into the decomposing furnace through the grate cooler to decompose the sludge.
The combustion improver is coal ash.
The decomposition temperature of the decomposing furnace is 1000 ℃.
The water content of the sludge treated by the experiment is 21.6 percent, and the content of dioxin and furan in the flue gas after incineration is 0.183ng/m3。
Comparative example 2
A method for cooperatively treating sludge by a cement kiln mainly comprises the following steps:
a, pretreating sludge, namely mechanically dehydrating the sludge at first, keeping the water content of the sludge at 35%, then adding the dehydrated sludge into a mixing bin, adding 0.5% of flocculating agent and 0.1% of decomposing agent, and mixing and stirring for 20 min;
b, degrading and drying, placing the uniformly mixed sludge for 5 hours at normal temperature, then putting the sludge into drying equipment, controlling the temperature at 120 ℃, drying for 30min, measuring the water content of the sludge, and crushing the dried sludge into 20-mesh particles after the drying is finished;
and C, burning, namely adding 10% of combustion improver into the obtained sludge particles, conveying the sludge particles to a decomposing furnace, burning the sludge particles by high-temperature gas of the decomposing furnace, doping the obtained sludge residues into cement raw materials according to the mass ratio of 20%, and adding the sludge residues into a rotary kiln to serve as raw materials for cement production.
The preparation method of the silicon-based chlorinated straw material comprises the following steps:
adding 50g of straw powder into 5g of zinc chloride and 200g of hydrochloric acid with the mass percent concentration of 10%, stirring for 2h, filtering, washing with water until the pH value is =7, filtering, drying to obtain a chlorinated straw material,
the decomposing agent is a polymer decomposing auxiliary agent, and the preparation method comprises the following steps:
uniformly mixing 5.6g of lanthanum phosphate and 150g of water, adding formic acid, adjusting the pH value of a solution to 6.2, controlling the temperature to 40 ℃, reacting for 120min, controlling the temperature to 70 ℃ in a high-pressure reaction kettle, reacting for 8h, adding 50g of chlorinated straw material and 10g of semicarbazide after the reaction is finished, adjusting the pH value to 1.4, controlling the temperature to 70 ℃, reacting for 120min, adding 0.1mol/L of sodium hydroxide solution to neutralize the pH value to 6 after the reaction is finished, stirring for 30min, filtering, heating the filtered solid to 150 ℃, preserving the temperature for 20min, crushing and grinding after the reaction is finished, thereby obtaining the polymer decomposition aid.
The flocculant is a polymeric flocculant polyacrylamide.
High-temperature hot gas generated by burning the kiln head of the rotary cement kiln is sent into the decomposing furnace through the grate cooler to decompose the sludge.
The combustion improver is coal ash.
The decomposition temperature of the decomposing furnace is 1000 ℃.
The water content of the sludge treated by the experiment is 18.4 percent, and the content of dioxin and furan in the flue gas after incineration is 0.092ng/m3。
Comparative example 3
A method for cooperatively treating sludge by a cement kiln mainly comprises the following steps:
a, pretreating sludge, namely mechanically dehydrating the sludge at first, keeping the water content of the sludge at 35%, then adding the dehydrated sludge into a mixing bin, adding 1% of an acidifying agent and 0.1% of a decomposing agent, and mixing and stirring for 20 min;
b, degrading and drying, placing the uniformly mixed sludge for 5 hours at normal temperature, then putting the sludge into drying equipment, controlling the temperature at 120 ℃, drying for 30min, measuring the water content of the sludge, and crushing the dried sludge into 20-mesh particles after the drying is finished;
and C, burning, namely adding 10% of combustion improver into the obtained sludge particles, conveying the sludge particles to a decomposing furnace, burning the sludge particles by high-temperature gas of the decomposing furnace, doping the obtained sludge residues into cement raw materials according to the mass ratio of 20%, and adding the sludge residues into a rotary kiln to serve as raw materials for cement production.
The preparation method of the silicon-based chlorinated straw material comprises the following steps:
adding 50g of straw powder into 5g of zinc chloride and 200g of hydrochloric acid with the mass percentage concentration of 10%, stirring for 2h, filtering, washing with water until the pH value is =7, filtering, drying to obtain a chlorinated straw material, then uniformly mixing with 6g of methylsilanetiol and 100g of water, controlling the temperature at 60 ℃, stirring for 3h, drying, grinding into powder of 50 meshes to obtain a silicon-based chlorinated straw material;
the decomposing agent is a polymer decomposing auxiliary agent, and the preparation method comprises the following steps:
uniformly mixing 150g of water, adding formic acid, adjusting the pH value of the solution to 6.2, controlling the temperature to be 40 ℃, reacting for 120min, controlling the temperature to be 70 ℃ in a high-pressure reaction kettle, reacting for 8h, adding 50g of silicon-based chlorinated straw material and 10g of semicarbazide after the reaction is finished, adjusting the pH value to 1.4, controlling the temperature to be 70 ℃, reacting for 120min, adding 0.1mol/L of sodium hydroxide solution after the reaction is finished, neutralizing the pH value to 6, stirring for 30min, filtering, heating the filtered solid to 150 ℃, preserving the temperature for 20min, crushing and grinding after the reaction is finished, thereby obtaining the polymer decomposition aid.
The acidifying agent is hydrochloric acid.
High-temperature hot gas generated by burning the kiln head of the rotary cement kiln is sent into the decomposing furnace through the grate cooler to decompose the sludge.
The combustion improver is coal ash.
The decomposition temperature of the decomposing furnace is 1000 ℃.
The water content of the sludge treated by the experiment is 15.7 percent, and the content of dioxin and furan in the flue gas after incineration is 0.061ng/m3。
Claims (8)
1. A method for cooperatively treating sludge by a cement kiln mainly comprises the following steps:
a, pretreating sludge, namely mechanically dehydrating the sludge at first, keeping the water content of the sludge at 35-58%, then adding the dehydrated sludge into a mixing bin, adding 1-3.8% of an acidifying agent, 0.5-4.5% of a flocculating agent and 0.1-0.6% of a decomposing agent, and mixing and stirring for 20-30 min;
b, degrading and drying, namely placing the uniformly mixed sludge at normal temperature for 5-10h, then putting the sludge into drying equipment, controlling the temperature to be 120-240 ℃, drying for 30-60min, measuring the water content of the sludge, and crushing the dried sludge into 20-50-mesh particles after the moisture content is measured;
c, burning, namely adding 10-20% of combustion improver into the obtained sludge particles, sending the sludge particles to a decomposing furnace, burning the sludge particles by high-temperature gas of the decomposing furnace, doping the obtained sludge residues into cement raw materials according to the mass ratio of 20-35%, and adding the sludge residues into a rotary kiln to serve as raw materials for cement production;
the decomposing agent is a polymer decomposing auxiliary agent generated by condensation reaction of silicon-based chlorinated straw materials, lanthanum phosphate and semicarbazide.
2. The method for the cement kiln co-processing sludge as claimed in claim 1, wherein: the preparation method of the silicon-based chlorinated straw material comprises the following steps:
adding 50-80 parts of straw powder into 5-10 parts of zinc chloride and 320 parts of hydrochloric acid with the mass percentage concentration of 10-15% by weight, stirring for 2-5h, filtering, washing with water until the pH value is =7, filtering, drying to obtain a chlorinated straw material, then uniformly mixing with 6-13 parts of methylsilanetiol and 200 parts of 100-doped water, controlling the temperature to be 60-75 ℃, stirring for 3-7h, drying, grinding into powder with the particle size of 50-70 meshes to obtain the silicon-based chlorinated straw material.
3. The method for the cement kiln co-processing sludge as claimed in claim 1, wherein: the decomposing agent is a polymer decomposing auxiliary agent, and the preparation method comprises the following steps:
according to the mass portion, 5.6-9.7 portions of lanthanum phosphate and 180 portions of 150-60 ℃ of water are uniformly mixed, formic acid is added, the pH value of the solution is adjusted to be 6.2-8.5, the temperature is controlled to be 40-60 ℃, the reaction is carried out for 120-180min, then the temperature is controlled to be 70-80 ℃ in a high-pressure reaction kettle, the reaction is carried out for 8-20h, 50-70 portions of silicon-based chlorinated straw material and 10-20 portions of semicarbazide are added after the reaction is finished, the pH value is adjusted to be 1.4-3.1, the temperature is controlled to be 70-80 ℃, the reaction is carried out for 120-180min, 0.1-0.5mol/L of sodium hydroxide solution is added after the reaction is finished, the pH value is 6-8, the stirring is carried out for 30-60min, then the filtration is carried out, the filtered solid is heated to 150-180 ℃, the temperature is kept for 20-60 min.
4. The method for the cement kiln co-processing sludge as claimed in claim 1, wherein: the acidifying agent is hydrochloric acid or oxalic acid or acetic acid.
5. The method for the cement kiln co-processing sludge as claimed in claim 1, wherein: the flocculant is polyacrylamide, polyaluminium chloride or polyferric chloride which are polymeric flocculant.
6. The method for the cement kiln co-processing sludge as claimed in claim 1, wherein: high-temperature hot gas generated by burning the kiln head of the rotary cement kiln is sent into the decomposing furnace through the grate cooler to decompose the sludge.
7. The method for the cement kiln co-processing sludge as claimed in claim 1, wherein: the combustion improver is coal ash or waste paper scrap or coke.
8. The method for the cement kiln co-processing sludge as claimed in claim 1, wherein: the decomposition temperature of the decomposition furnace is 1000-1200 ℃.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113045290A (en) * | 2021-04-19 | 2021-06-29 | 浙江红狮环保股份有限公司 | Method for treating high-calorific-value oil sludge by cement clinker device |
| CN113531539A (en) * | 2021-07-20 | 2021-10-22 | 浙江红狮环保股份有限公司 | Method for resource utilization of sodium chloride waste salt |
| CN114751623A (en) * | 2022-06-15 | 2022-07-15 | 北京环球中科水务科技股份有限公司 | Sludge dewatering conditioner and sludge dewatering method |
| CN116119953A (en) * | 2023-03-21 | 2023-05-16 | 浙江红狮环保股份有限公司 | Method for cooperatively disposing printing and dyeing sludge by cement kiln |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59147700A (en) * | 1983-02-10 | 1984-08-24 | Takenaka Komuten Co Ltd | Treatment of sludge |
| CN1233596A (en) * | 1999-04-28 | 1999-11-03 | 黄大军 | Method for treating and utilizing human excrement in city |
| JP2000015293A (en) * | 1998-06-30 | 2000-01-18 | Sumitomo Chem Co Ltd | Apparatus for reducing volume of organic waste |
| WO2011018976A1 (en) * | 2009-08-11 | 2011-02-17 | 太平洋セメント株式会社 | Organic sludge drying system and drying method |
| KR20120107582A (en) * | 2011-03-22 | 2012-10-04 | 윤장효 | Apparatus for processing food waste |
| CN105016588A (en) * | 2014-04-30 | 2015-11-04 | 天津名唐环保科技有限公司 | Decomposing agent and using method thereof |
| CN106995264A (en) * | 2017-06-08 | 2017-08-01 | 张花枝 | A kind of septic tank Abfallwirtschaft device |
-
2020
- 2020-06-18 CN CN202010556645.9A patent/CN111646671B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59147700A (en) * | 1983-02-10 | 1984-08-24 | Takenaka Komuten Co Ltd | Treatment of sludge |
| JP2000015293A (en) * | 1998-06-30 | 2000-01-18 | Sumitomo Chem Co Ltd | Apparatus for reducing volume of organic waste |
| CN1233596A (en) * | 1999-04-28 | 1999-11-03 | 黄大军 | Method for treating and utilizing human excrement in city |
| WO2011018976A1 (en) * | 2009-08-11 | 2011-02-17 | 太平洋セメント株式会社 | Organic sludge drying system and drying method |
| KR20120107582A (en) * | 2011-03-22 | 2012-10-04 | 윤장효 | Apparatus for processing food waste |
| CN105016588A (en) * | 2014-04-30 | 2015-11-04 | 天津名唐环保科技有限公司 | Decomposing agent and using method thereof |
| CN106995264A (en) * | 2017-06-08 | 2017-08-01 | 张花枝 | A kind of septic tank Abfallwirtschaft device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113045290A (en) * | 2021-04-19 | 2021-06-29 | 浙江红狮环保股份有限公司 | Method for treating high-calorific-value oil sludge by cement clinker device |
| CN113531539A (en) * | 2021-07-20 | 2021-10-22 | 浙江红狮环保股份有限公司 | Method for resource utilization of sodium chloride waste salt |
| CN114751623A (en) * | 2022-06-15 | 2022-07-15 | 北京环球中科水务科技股份有限公司 | Sludge dewatering conditioner and sludge dewatering method |
| CN116119953A (en) * | 2023-03-21 | 2023-05-16 | 浙江红狮环保股份有限公司 | Method for cooperatively disposing printing and dyeing sludge by cement kiln |
| CN116119953B (en) * | 2023-03-21 | 2024-10-22 | 浙江红狮环保股份有限公司 | Method for cooperatively disposing printing and dyeing sludge by cement kiln |
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Denomination of invention: A method of sludge collaborative disposal in cement kiln Effective date of registration: 20220629 Granted publication date: 20220315 Pledgee: Industrial and Commercial Bank of China Limited Lanxi sub branch Pledgor: ZHEJIANG HONGSHI ENVIRONMENTAL PROTECTION Co.,Ltd. Registration number: Y2022330001173 |
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