CN112125492A - Chemical sludge treatment method - Google Patents
Chemical sludge treatment method Download PDFInfo
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- CN112125492A CN112125492A CN202011155676.XA CN202011155676A CN112125492A CN 112125492 A CN112125492 A CN 112125492A CN 202011155676 A CN202011155676 A CN 202011155676A CN 112125492 A CN112125492 A CN 112125492A
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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
- C02F11/004—Sludge detoxification
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/38—Multi-hearth arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/442—Waste feed arrangements
- F23G5/444—Waste feed arrangements for solid waste
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2205/00—Waste feed arrangements
- F23G2205/12—Waste feed arrangements using conveyors
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- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of sludge treatment, and particularly relates to a chemical sludge treatment method, which comprises the following steps: chemical sludge is introduced into the tank body for gravity concentration, primary dehydration is carried out, and the sludge volume is reduced; the concentrated sludge is subjected to material treatment and chemical treatment pretreatment operation, so that the colloidal feather structure can be correspondingly changed, and the sludge is coagulated and precipitated; carrying out multi-stage waterproof drying operation on the pretreated sludge, and further dehydrating and drying the sludge; the dried sludge is conveyed to an incinerator for incineration treatment so as to remove impurities and kill germs; the incinerated sludge can carry out final treatment on the heavy metal toxicants in the incinerated sludge. Has the advantages that: the invention carries out physical pretreatment and chemical pretreatment before incineration treatment of the sludge, can correspondingly change the glue feather structure of the sludge and lead the sludge to generate agglutination and precipitation, and is beneficial to the subsequent incineration treatment.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a chemical sludge treatment method and a device system.
Background
Most of various sewage discharged by the chemical industry contains high toxicity, has complex components and is difficult to purify, thereby polluting large-area land resources and water resources in China. Chemical pollution has become the most serious pollution source in the industrial water pollution in China.
The method for treating the hazardous waste sludge by a plurality of enterprises is to simply dehydrate and send the hazardous waste sludge to a hazardous waste treatment center for centralized treatment. However, the biochemical sludge after simple dehydration has the following problems: the water content in the treated sludge is high, the amount of the generated sludge is large, and high retreatment cost needs to be paid when the sludge is sent to a hazardous waste center for treatment. In addition, the hazardous waste treatment capacity of each place is limited, so that the sludge can not be stacked due to the fact that the hazardous waste can not be treated in time, and the problem that the cost is large can not be solved in time effectively.
Therefore, a chemical sludge treatment method and a device system are provided to solve the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a chemical sludge treatment method and a device system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a chemical sludge treatment method comprises the following steps:
s1, introducing the chemical sludge into the tank body for gravity concentration, preliminarily dehydrating and reducing the sludge volume;
s2, carrying out pretreatment operations of material treatment and chemical treatment on the concentrated sludge, and correspondingly changing the structure of the colloidal feather and enabling the sludge to agglutinate and precipitate;
s3, performing multi-stage waterproof drying operation on the pretreated sludge, and further dehydrating and drying the sludge;
s4, conveying the dried sludge to an incinerator for incineration treatment to remove impurities and kill germs;
s5, the incinerated sludge can carry out final treatment on the heavy metal toxicant existing in the incinerated sludge.
In the above chemical sludge treatment method, the gravity concentration in step S1 employs a continuous gravity concentration tank, in the gravity concentration process, the sludge inlet and outlet are continuous, and the sludge discharge may be continuous or intermittent, the gravity concentration tank may be selected according to the size of the tank, and when the tank is large, a radial flow concentration tank is employed; when the pool is small, a vertical flow type concentration pool is adopted.
In the chemical sludge treatment method, the chemical treatment in step S2 is to aggregate and precipitate the sludge by adding a chemical agent, and the specific operations are as follows:
A) introducing the sludge subjected to the concentration treatment into an activated sludge tank;
B) respectively introducing a chemical reagent and a medicament for promoting sterilization and hydrolysis into the activated sludge tank, wherein the chemical reagent can be selected from acids, metal salts, surfactants and polymer polyelectrolytes, and the medicament for promoting sterilization and hydrolysis can be selected from alkalis, strong oxidants (such as ozone), potassium permanganate and some biological reagents;
C) through the addition of the chemical reagent, the sludge in the activated sludge tank is conditioned to an acidic environment, namely PH =3, so that the sludge can be sufficiently squeezed and dehydrated.
In the chemical sludge treatment method, the physical treatment in step S2 adopts a heat treatment method, and the specific operations are as follows:
1) introducing the sludge after chemical treatment into a heat treatment tank body;
2) the energy of the heat treatment tank body is indirectly heated by waste heat recovered by other facilities, namely the energy can be derived from heat energy in the subsequent incineration treatment;
3) the temperature of the heat treatment is set above 70 ℃ and is continued for at least 30 minutes to ensure the effect of the treatment.
In the above chemical sludge treatment method, the drying operation in step S3 includes:
the method comprises the following steps: smoothly introducing the pretreated sludge into a low-temperature dehumidification drier, and cutting the sludge into strips by a stirrer and a cutter which are arranged in the low-temperature dehumidification drier;
step two: the sludge cut into strips falls into a mesh belt which is arranged at the lower sides of the stirrer and the cutter and slowly travels under the action of gravity;
step three: the hot dry air rises from the bottom of the mesh belt at a high speed, contacts with the sludge and dries the sludge, and the wet air enters the dehumidifying pump system;
step four: the temperature of the wet air is lower than the dew point in a cooling mode, and the water vapor is condensed and discharged out of a sewage pipeline;
step five: and the dehydrated air is heated to become hot dry air by a heating mode, and the hot dry air is sent into a mesh belt drying system to continuously dry the sludge, so that the air is recycled, and the latent heat of the vapor in the exhaust air and the sensible heat of the air are recovered at the same time.
In the chemical sludge treatment method, the mesh belts in the drying operation are arranged in a multistage manner from top to bottom, so that the sludge can be sufficiently dried by hot air, and the mesh belts carry out the sludge conveying operation.
In the above chemical sludge treatment method, the incineration in step S4 specifically comprises:
a. conveying the dried sludge into an incinerator by using a lifter;
b. the furnace is divided into 4-12 stages along the vertical direction, each stage is provided with a horizontal round plate as a hearth, a rotatable stirring blade is arranged above the hearth, and the rotation is carried out for 0.5-4 weeks every minute;
c. the sludge is put into the furnace from the upper part of the furnace, and is stirred by the stirring blades on the upper bed surface and sequentially falls on the next-stage bed surface;
d. the sludge is further dried by the upper layer furnace temperature of 300-550 ℃, then reaches the middle part of the furnace, is set to 750-1000 ℃, and reaches the bottom layer of the furnace, is set to 220-330 ℃, and is cooled by air.
In the chemical sludge treatment method, the final treatment mode is the same as the chemical treatment mode in the pretreatment, namely, the incinerated sludge is subjected to secondary sedimentation, and the final treatment can be selected according to the treatment process, namely, after the incineration treatment, a detection instrument is used for detecting toxic heavy metal impurities in the sludge to determine whether to perform chemical treatment again.
A chemical sludge treatment equipment system comprises a concentration tank body, an activated sludge tank, a heat treatment tank body, a low-temperature dehumidification drier and an incinerator, wherein the output end of the concentration tank body is communicated with the activated sludge tank through a plurality of first pipelines, the outer side wall of each first pipeline is connected with a first valve, a first pump body is arranged between the activated sludge tank and the heat treatment tank body, two ends of the first pump body are respectively connected with the activated sludge tank and the heat treatment tank body through a second pipeline and a third pipeline, the output end of the heat treatment tank body is correspondingly connected with the low-temperature dehumidification drier, a plurality of mesh belt conveying devices for conveying sludge are arranged in the low-temperature dehumidification drier, a hot air outlet pipeline for drying treatment is arranged on the lower side of a mesh belt of each mesh belt conveying device, a condensation pipeline for absorbing humid air is arranged in the low-temperature dehumidifier, and the condensation pipeline is connected with an external heating device, and the heated hot air is connected with the hot air outlet pipe through a circulating fan and a circulating pipeline, the output end of the mesh belt conveying device is connected with the input end of the incinerator through a lifter, and the output end of the incinerator is connected with an external collection tank body.
In foretell chemical industry sludge treatment equipment system, be provided with a plurality of vertical distribution's hearth in the burning furnace, the hearth upper end rotates and is connected with a plurality of stirring vane, and is provided with the guide hole of a plurality of upper and lower intercommunications between every hearth, burn the output of burning furnace and collect by the second pump body and fourth pipe connection between the cell body, be provided with the measuring instrument that is used for detecting mud heavy metal composition on the lateral wall of collecting the cell body, and the upper end of collecting the cell body is provided with the medication dosing device.
Compared with the prior art, the chemical sludge treatment method and the equipment system have the advantages that:
1. the invention carries out physical pretreatment and chemical pretreatment before incineration treatment of the sludge, can correspondingly change the colloidal feather structure of the sludge and enable the sludge to be agglutinated and precipitated, is beneficial to the subsequent incineration treatment and plays an auxiliary role, and the chemical pretreatment can also adjust the acid-base environment of the sludge, so that the dehydration property of the sludge can be improved.
2. The traditional heat drying equipment for the heat drying treatment wall has the advantages of energy saving by 30 percent, high automation degree, stable and safe operation, realization of air recycling, reduction of the water content of the sludge to 10-30 percent, utilization of clean energy as heat supply energy and capability of meeting the requirements of sustainable development.
Drawings
FIG. 1 is a schematic diagram of the steps of a chemical sludge treatment process and equipment system according to the present invention;
FIG. 2 is a process flow diagram of a chemical sludge treatment method and an equipment system according to the present invention;
FIG. 3 is a system structure diagram of a chemical sludge treatment method and an apparatus system according to the present invention.
In the figure, 1 a concentration tank body, 2 an activated sludge tank, 3 a heat treatment tank body, 4 a low-temperature dehumidification drier, 5 an incinerator, 6 a mesh belt conveying device, 7 a condensation pipeline, 8 a circulating fan, 9 a collection tank body and 10 a hot air outlet pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Examples
Referring to fig. 1-2, a chemical sludge treatment method includes the following steps:
s1, introducing the chemical sludge into the tank body for gravity concentration, preliminarily dehydrating and reducing the sludge volume;
s2, carrying out pretreatment operations of material treatment and chemical treatment on the concentrated sludge, and correspondingly changing the structure of the colloidal feather and enabling the sludge to agglutinate and precipitate;
s3, performing multi-stage waterproof drying operation on the pretreated sludge, and further dehydrating and drying the sludge;
s4, conveying the dried sludge to an incinerator for incineration treatment to remove impurities and kill germs;
s5, the incinerated sludge can carry out final treatment on the heavy metal toxicant existing in the incinerated sludge.
Wherein, the gravity concentration in the step S1 adopts a continuous gravity concentration tank, the mud inlet and the water outlet are continuous in the gravity concentration process, the mud discharge can be continuous or intermittent, the gravity concentration tank can be selected according to the size of the tank, and when the tank is larger, a radial flow concentration tank is adopted; when the pool is small, a vertical flow type concentration pool is adopted.
Wherein, the chemical treatment in the step S2 is to aggregate and precipitate the sludge by adding chemical agents, and the specific operations are as follows:
A) introducing the sludge subjected to the concentration treatment into an activated sludge tank;
B) respectively introducing a chemical reagent and a medicament for promoting sterilization and hydrolysis into the activated sludge tank, wherein the chemical reagent can be selected from acids, metal salts, surfactants and polymer polyelectrolytes, and the medicament for promoting sterilization and hydrolysis can be selected from alkalis, strong oxidants (such as ozone), potassium permanganate and some biological reagents;
C) through the addition of the chemical reagent, the sludge in the activated sludge tank is conditioned to an acidic environment, namely PH =3, so that the sludge can be sufficiently squeezed and dehydrated.
Specifically, the physical treatment in step S2 adopts a heat treatment method, and the specific operations are as follows:
1) introducing the sludge after chemical treatment into a heat treatment tank body;
2) the energy of the heat treatment tank body is indirectly heated by waste heat recovered by other facilities, namely the energy can be derived from heat energy in the subsequent incineration treatment;
3) the temperature of the heat treatment is set above 70 ℃ and is continued for at least 30 minutes to ensure the effect of the treatment.
The drying operation in step S3 includes:
the method comprises the following steps: smoothly introducing the pretreated sludge into a low-temperature dehumidification drier, and cutting the sludge into strips by a stirrer and a cutter which are arranged in the low-temperature dehumidification drier;
step two: the sludge cut into strips falls into a mesh belt which is arranged at the lower sides of the stirrer and the cutter and slowly travels under the action of gravity;
step three: the hot dry air rises from the bottom of the mesh belt at a high speed, contacts with the sludge and dries the sludge, and the wet air enters the dehumidifying pump system;
step four: the temperature of the wet air is lower than the dew point in a cooling mode, and the water vapor is condensed and discharged out of a sewage pipeline;
step five: and the dehydrated air is heated to become hot dry air by a heating mode, and the hot dry air is sent into a mesh belt drying system to continuously dry the sludge, so that the air is recycled, and the latent heat of the vapor in the exhaust air and the sensible heat of the air are recovered at the same time.
Specifically, the mesh belt in the drying operation is arranged in a multistage manner from top to bottom, so that the sludge can be sufficiently dried by hot air, and the mesh belt can convey the sludge.
Wherein, the specific operation of incineration in the step S4 is as follows:
a. conveying the dried sludge into an incinerator by using a lifter;
b. the furnace is divided into 4-12 stages along the vertical direction, each stage is provided with a horizontal round plate as a hearth, a rotatable stirring blade is arranged above the hearth, and the rotation is carried out for 0.5-4 weeks every minute;
c. the sludge is put into the furnace from the upper part of the furnace, and is stirred by the stirring blades on the upper bed surface and sequentially falls on the next-stage bed surface;
d. the sludge is further dried by the upper layer furnace temperature of 300-550 ℃, then reaches the middle part of the furnace, is set to 750-1000 ℃, and reaches the bottom layer of the furnace, is set to 220-330 ℃, and is cooled by air.
The final treatment mode is the same as the chemical treatment mode in the pretreatment, namely, the sludge after incineration is subjected to secondary precipitation, and the final treatment can be accepted according to the requirements of the treatment process, namely, toxic heavy metal impurities in the sludge are detected by using a detection instrument after the incineration treatment so as to determine whether to perform chemical treatment again, specifically, when the sludge is conditioned to an acidic environment (pH =3), the squeezing dehydration performance of the sludge is obviously improved, because the negative charges on the surface are neutralized by hydrogen ions, the electrostatic repulsion force is reduced, and the alkaline environment is not beneficial to the dehydration of the sludge. The salt is added into the activated sludge pool, the electrolyte concentration can influence the metabolism and the coagulation behavior of microorganisms, and further the glue feather property and the dehydration property of the generated sludge are changed; in waste sludge where no bioflocculation and microbial metabolism takes place, electrolytes can also have a considerable effect. The salts in the sludge mainly comprise sodium salts and magnesium salts, and then calcium salts, potassium salts and iron salts. The addition of the halogen metal salt can cause the release of the biological macromolecules among the sludge particles, and the disintegration of the sludge particles is caused. The existence of the salt not only can compress the electric double layer on the surface of the sludge particles and is beneficial to the contact of the particles, but also greatly improves the conductivity of the sludge and changes the surface potential to influence the dehydration property of the waste sludge. The electrolytes also affect the subsequent digestion of the sludge, mainly because the metabolism of the microorganisms and the process of taking up organic substances are affected.
Referring to fig. 3, a chemical sludge treatment equipment system comprises a concentration tank body 1, an activated sludge tank 2, a heat treatment tank body 3, a low-temperature dehumidification drier 4 and an incinerator 5, wherein the output end of the concentration tank body 1 is communicated with the activated sludge tank 2 through a plurality of first pipelines, a first valve is connected on the outer side wall of each first pipeline, a first pump body is arranged between the activated sludge tank 2 and the heat treatment tank body 3, two ends of the first pump body are respectively connected with the activated sludge tank 2 and the heat treatment tank body 3 through a second pipeline and a third pipeline, the output end of the heat treatment tank body 3 is correspondingly connected with the low-temperature dehumidification drier 4, a plurality of mesh belt conveying devices 6 for conveying sludge are arranged in the low-temperature dehumidification drier 4, a hot air outlet pipeline 10 for processing is arranged on the lower side of a mesh belt conveying device 6, and a condensation pipeline 7 for absorbing humid air is arranged in the low-temperature dehumidification drier 4, the condensation pipeline is connected with an external heating device, heated hot air and a hot air outlet pipe are connected through a circulating fan 8 and a circulating pipeline, the output end of the mesh belt conveying device 6 is connected with the input end of the incinerator 5 through a lifter, and the output end of the incinerator 5 is connected with an external collection tank body 9.
Wherein, be provided with a plurality of vertical distribution's hearth in the burning furnace 5, the hearth upper end is rotated and is connected with a plurality of stirring vane, and is provided with a plurality of guide holes that communicate from top to bottom between every hearth, burns the output of burning furnace 5 and collects by the second pump body and fourth pipe connection between the cell body 9, is provided with the measuring instrument that is used for detecting mud heavy metal composition on the lateral wall of collecting cell body 9, and the upper end of collecting cell body 9 is provided with the medication dosing device.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The chemical sludge treatment method is characterized by comprising the following steps:
s1, introducing the chemical sludge into the tank body for gravity concentration, preliminarily dehydrating and reducing the sludge volume;
s2, carrying out pretreatment operations of material treatment and chemical treatment on the concentrated sludge, and correspondingly changing the structure of the colloidal feather and enabling the sludge to agglutinate and precipitate;
s3, performing multi-stage waterproof drying operation on the pretreated sludge, and further dehydrating and drying the sludge;
s4, conveying the dried sludge to an incinerator for incineration treatment to remove impurities and kill germs;
s5, the incinerated sludge can carry out final treatment on the heavy metal toxicant in the incinerated sludge;
the chemical treatment in the step S2 is to aggregate and precipitate the sludge by adding a chemical agent, and the specific operations are as follows:
A) introducing the sludge subjected to the concentration treatment into an activated sludge tank;
B) respectively introducing a chemical reagent and a medicament for promoting sterilization and hydrolysis into the activated sludge tank, wherein the chemical reagent is selected from acids, metal salts, surfactants and polymer polyelectrolytes, and the medicament for promoting sterilization and hydrolysis is selected from alkalies, strong oxidants (such as ozone), potassium permanganate and some biological reagents;
C) through the addition of the chemical reagent, the sludge in the activated sludge tank is conditioned to an acidic environment, namely PH =3, so that the sludge can be sufficiently squeezed and dehydrated.
2. The chemical sludge treatment method according to claim 1, wherein the gravity concentration in step S1 is performed by using a continuous gravity concentration tank, the gravity concentration process is performed by using a continuous gravity concentration tank, the sludge feeding and discharging are continuous, and the sludge discharge can be continuous or intermittent, the gravity concentration tank is selected according to the size of the tank, and when the tank is large, a radial-flow concentration tank is used; when the pool is small, a vertical flow type concentration pool is adopted.
3. The chemical sludge treatment method according to claim 1, wherein the physical treatment in the step S2 adopts a heat treatment mode, and the specific operation is as follows:
1) introducing the sludge after chemical treatment into a heat treatment tank body;
2) the energy of the heat treatment tank body is indirectly heated by utilizing waste heat recovered by other facilities;
3) the temperature of the heat treatment is set above 70 ℃ and is continued for at least 30 minutes to ensure the effect of the treatment.
4. The chemical sludge treatment method according to claim 1, wherein the drying operation in the step S3 comprises the following steps:
the method comprises the following steps: smoothly introducing the pretreated sludge into a low-temperature dehumidification drier, and cutting the sludge into strips by a stirrer and a cutter which are arranged in the low-temperature dehumidification drier;
step two: the sludge cut into strips falls into a mesh belt which is arranged at the lower sides of the stirrer and the cutter and slowly travels under the action of gravity;
step three: the hot dry air rises from the bottom of the mesh belt at a high speed, contacts with the sludge and dries the sludge, and the wet air enters the dehumidifying pump system;
step four: the temperature of the wet air is lower than the dew point in a cooling mode, and the water vapor is condensed and discharged out of a sewage pipeline;
step five: and the dehydrated air is heated to become hot dry air by a heating mode, and the hot dry air is sent into a mesh belt drying system to continuously dry the sludge, so that the air is recycled, and the latent heat of the vapor in the exhaust air and the sensible heat of the air are recovered at the same time.
5. The chemical sludge treatment method according to claim 4, wherein the mesh belts in the drying operation are arranged in a multistage manner from top to bottom, so that the sludge can be sufficiently dried by hot air, and the mesh belts carry out the sludge conveying operation.
6. The chemical sludge treatment method according to claim 1, wherein the incineration in the step S4 comprises the following specific operations:
a. conveying the dried sludge into an incinerator by using a lifter;
b. the furnace is divided into 4-12 stages along the vertical direction, each stage is provided with a horizontal round plate as a hearth, a rotatable stirring blade is arranged above the hearth, and the rotation is about 0.5-4 weeks per minute;
c. the sludge is put into the furnace from the upper part of the furnace, and is stirred by the stirring blades on the upper bed surface and sequentially falls on the next-stage bed surface;
d. the sludge is further dried by the upper layer furnace temperature of 300-550 ℃, then reaches the middle part of the furnace, is set at the temperature of about 750-1000 ℃, and reaches the bottom layer of the furnace at the temperature of 220-330 ℃, and is cooled by air.
7. The method as claimed in claim 1, wherein the final treatment is performed in the same manner as the chemical treatment in the pretreatment, i.e. the incinerated sludge is subjected to secondary sedimentation, and the final treatment can be selected according to the treatment process, i.e. after the incineration treatment, the toxic heavy metal impurities in the sludge are detected by a detection instrument to determine whether to perform the chemical treatment again.
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| CN106746477A (en) * | 2016-12-13 | 2017-05-31 | 北京城市排水集团有限责任公司 | A kind of urban wastewater treatment firm Treatment of Sludge and resource utilization method |
| CN106698888A (en) * | 2016-12-29 | 2017-05-24 | 华中科技大学 | Method for optimizing added amount of chemical conditioner for deep dehydration of sludge |
| CN110040937A (en) * | 2019-04-22 | 2019-07-23 | 深圳瑞新达新能源科技有限公司 | A kind of heat pump low temperature sludge drying system |
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