CN112390497A - Sludge treatment system capable of effectively reducing water content of sludge - Google Patents

Sludge treatment system capable of effectively reducing water content of sludge Download PDF

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Publication number
CN112390497A
CN112390497A CN202011259306.0A CN202011259306A CN112390497A CN 112390497 A CN112390497 A CN 112390497A CN 202011259306 A CN202011259306 A CN 202011259306A CN 112390497 A CN112390497 A CN 112390497A
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China
Prior art keywords
sludge
tank
filtrate
treatment system
outlet
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CN202011259306.0A
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Chinese (zh)
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何方
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Xiangtan Xianfeng Energy Saving And Environmental Protection Technology Co ltd
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Xiangtan Xianfeng Energy Saving And Environmental Protection Technology Co ltd
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Priority to CN202011259306.0A priority Critical patent/CN112390497A/en
Publication of CN112390497A publication Critical patent/CN112390497A/en
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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
    • C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention relates to a sludge treatment system capable of effectively reducing the water content of sludge. Comprises a sludge tank connected with sludge and a dehydration treatment system for dehydrating the sludge; a sludge concentration treatment device is also arranged between the sludge tank and the dehydration treatment system; the sludge discharged from the sludge tank enters a sludge concentration treatment device for concentration treatment, the supernatant of the sludge concentration treatment device is discharged, and the concentrated sludge enters a dehydration treatment system.

Description

Sludge treatment system capable of effectively reducing water content of sludge
Technical Field
The invention relates to a sludge, sewage and other treatment system, in particular to a sludge treatment system which can be used in occasions such as a waste incineration plant or a waste incineration power plant and the like and can effectively reduce the water content of sludge.
Background
The current sludge treatment system comprises a sludge tank, a dehydration treatment system and the like. Various kinds of sludge, such as the residual liquid of the leachate of the garbage, the sludge and scum of a sewage pretreatment system, and the like, are discharged into a sludge tank, homogenized in the sludge tank, and then input into a dehydration treatment system for dehydration treatment. The treated sludge is output to a sludge hopper to be discharged, and the filtrate is discharged to a middle water tank of a sewage pretreatment system to be subjected to subsequent treatments such as evaporation, biochemistry and the like.
SUMMARY OF THE PATENT FOR INVENTION
The technical scheme adopted by the invention for solving the technical problems is as follows: the sludge treatment system for effectively reducing the water content of the sludge comprises a sludge pool connected with the sludge and a dehydration treatment system for dehydrating the sludge; a sludge concentration treatment device is also arranged between the sludge tank and the dehydration treatment system; and the sludge discharged from the sludge tank enters the sludge concentration treatment device for concentration treatment, the supernatant of the sludge concentration treatment device is discharged, and the concentrated sludge enters the dehydration treatment system.
In the sludge treatment system for effectively reducing the water content of the sludge, the sludge concentration treatment device comprises one or more sludge concentration tanks provided with stirring devices; each sludge concentration tank comprises a sludge inlet, a sludge outlet, a filtrate outlet connected with the dehydration treatment system and a supernatant outlet for discharging supernatant;
the sludge inlet is connected with the outlet of the sludge tank and the sludge outlet of the dehydration treatment system, and is connected with sludge.
In the sludge treatment system for effectively reducing the water content of the sludge, the dehydration treatment system comprises a centrifugal dehydrator, a filtrate buffer tank, a filtrate precipitator and a centrifugal water outlet tank which are sequentially connected;
the filtrate outlet of the sludge concentration tank is connected with the inlet of the centrifugal dehydrator;
discharging sludge dehydrated by the centrifugal dehydrator, and allowing filtrate to enter the filtrate buffer pool for energy dissipation;
the filtrate after the energy dissipation of the filtrate buffer tank enters the filtrate precipitator for precipitation, and the precipitated filtrate is discharged to the centrifugal water outlet tank;
and discharging the sludge in the filtrate buffer tank and the filtrate precipitator to the sludge concentration tank.
In the sludge treatment system for effectively reducing the water content of the sludge, the sludge treatment system for effectively reducing the water content of the sludge further comprises a storage tank connected with the centrifugal water outlet tank.
The invention also provides sewage and a sludge treatment system for effectively reducing the water content of the sludge, which comprises a sewage pretreatment system and a sludge treatment system for effectively reducing the water content of the sludge, wherein the sewage pretreatment system comprises a primary treatment device for accessing the sewage to carry out primary treatment, an intermediate water tank for storing and outputting effluent and a clarification device connected between the primary treatment device and the intermediate water tank;
the sludge treatment system for effectively reducing the water content of the sludge comprises a sludge tank connected with the sludge, a dehydration treatment system for dehydrating the sludge, and a sludge concentration treatment device arranged between the sludge tank and the dehydration treatment system;
the sludge tank is connected with the intermediate water tank and the sludge and scum of the clarification device; and the sludge discharged from the sludge tank enters the sludge concentration treatment device for concentration treatment, the supernatant of the sludge concentration treatment device is discharged, and the concentrated sludge enters the dehydration treatment system.
In the sewage and sludge treatment system for effectively reducing the water content of the sludge, the clarification device is a multi-stage clarification device, and the sewage from the primary treatment device is treated and discharged to the intermediate water tank.
In the sewage and sludge treatment system for effectively reducing the water content of the sludge, the multistage clarifying device comprises a primary clarifier and a secondary clarifier which are sequentially connected between the primary treatment device and the middle water tank; the accessed sewage is pretreated by the primary treatment device, the primary clarifier, the secondary clarifier and the intermediate water tank in sequence; and discharging the sludge and scum of the primary clarifier and the secondary clarifier to the sludge tank.
In the sewage and sludge treatment system for effectively reducing the water content of the sludge, the multistage clarifying device further comprises a descaling mixing tank connected between the primary clarifier and the secondary clarifier; the descaling mixing tank is a sodium carbonate mixing tank;
the dehydration treatment system comprises a centrifugal dehydrator, a filtrate buffer tank, a filtrate precipitator and a centrifugal water outlet tank which are connected in sequence;
the sludge outlet of the sludge concentration treatment device is connected with the inlet of the centrifugal dehydrator;
discharging sludge dehydrated by the centrifugal dehydrator, and allowing filtrate to enter the filtrate buffer pool for energy dissipation;
the filtrate after the energy dissipation of the filtrate buffer tank enters the filtrate precipitator for precipitation, and the precipitated filtrate is discharged to the centrifugal water outlet tank;
the sludge of the filtrate buffer tank and the filtrate precipitator is discharged to the sludge concentration treatment device;
the sludge treatment system capable of effectively reducing the water content of the sludge further comprises a storage pool connected with the centrifugal water outlet tank; the storage pool is connected with the sodium carbonate mixing tank.
The implementation of the invention has the following beneficial effects: the sludge from the sludge tank firstly enters the sludge concentration treatment device for concentration treatment and then is discharged to the dehydration treatment system, so that the water content of the sludge can be reduced, the influence on the dehydration treatment system is reduced, and the reliable and stable operation of the system is ensured.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic process flow diagram of a first embodiment of a sludge treatment system for effectively reducing the water content of sludge according to the present invention;
FIG. 2 is a schematic view of a process flow of a first embodiment of a sludge treatment system for treating sewage and effectively reducing the water content of sludge according to the present invention;
FIG. 3 is a schematic view of a process flow of a second embodiment of the sewage treatment system of the present invention and a sludge treatment system for effectively reducing the water content of the sludge;
FIG. 4 is a schematic view of the process flow of the sewage and a sludge treatment system for effectively reducing the water content of the sludge according to the third embodiment of the present invention.
Detailed Description
As shown in fig. 1, it is a first embodiment of a sludge treatment system for effectively reducing the water content of sludge in the present invention, which can be used for treating the evaporation raffinate after the evaporation treatment of the garbage leachate, the sludge and scum generated by the pretreatment of the leachate, etc.; of course, the sludge treatment system capable of effectively reducing the water content of the sludge can also be used for treating other water-containing sludge.
As shown in the figure, the sludge treatment system for effectively reducing the water content of the sludge comprises a sludge tank 11, a sludge concentration treatment device, a dehydration treatment system and the like which are connected in sequence; of course, a hopper 18, a reservoir 17, etc. connected to the dewatering system may also be included.
The sludge is connected into the sludge pool 11, a stirring device (such as a submersible stirrer or other devices) can be arranged in the sludge pool 11, the sludge entering the sludge pool 11 is stirred and mixed uniformly, and then the sludge is pumped out to the sludge concentration treatment device. When the sludge is sent into the sludge concentration treatment device, a defoaming agent and the like can be added to take out foams in the sludge, so that the sludge is convenient to concentrate and precipitate. The sludge concentration treatment device comprises one or more sludge concentration tanks 12, and a stirring device (such as a stirrer, a screw pump or other stirring equipment) can be arranged in the sludge concentration tank 12 to concentrate the sludge entering the sludge concentration tank 12. In this embodiment, a sequencing batch operation may be used, such as feeding and stirring for 6-10 hours, settling for 4-8 hours, draining for 1-2 hours, stirring for 0.5-1 hour, and pumping sludge for 8 hours.
Each sludge thickening tank 12 includes a sludge inlet, a sludge outlet, a filtrate outlet, and a supernatant outlet. The sludge inlet is connected with the outlet of the sludge pool 11 and the sludge outlet of the dehydration treatment system, and is connected with sludge. The sludge outlet is connected with the mud bucket 18, and the sludge after the concentration treatment is output to the mud bucket 18 through the pump and is discharged. The supernatant outlet is connected with the reservoir 17, and the concentrated supernatant is output to the reservoir 17 via a pump for storage.
The filtrate after the concentration treatment in the sludge concentration tank 12 is discharged to a dehydration treatment system through a filtrate outlet. In this embodiment, the dewatering system includes a centrifugal dehydrator 13, a filtrate buffer tank 14, a filtrate precipitator 15, a centrifugal outlet tank 16, and the like, which are connected in this order.
The filtrate outlet of the sludge concentration tank 12 is connected with the inlet of the centrifugal dehydrator 13, and the filtrate after the concentration treatment by the sludge concentration tank 12 is output to the centrifugal dehydrator 13 for centrifugal dehydration. The sludge dewatered by the centrifugal dewatering machine 13 is discharged to a hopper 18, and the filtrate is output to a filtrate buffer tank 14. The filtrate is subjected to energy dissipation treatment in a filtrate buffer tank 14, the sludge after energy dissipation is periodically or irregularly discharged to a sludge concentration tank 12, and the filtrate is output to a filtrate precipitator 15. The filtrate is subjected to mud-water separation and precipitation in a filtrate precipitator 15, the precipitated sludge is periodically or irregularly discharged to a sludge concentration tank 12, and the filtrate is output to a centrifugal water outlet tank 16. The filtrate in the centrifugal water outlet tank 16 is output to the reservoir 17 by a pump or the like.
Through increasing sludge concentration processing apparatus, can effectually reduce the moisture content of mud, avoided getting into centrifugal dehydrator 13's the change on a large scale of mud moisture content, avoided the putty, need the defect of special messenger's management, improved the reliability of system operation.
In addition, the centrifugal dehydrator 13 may be equipped with a PLC control system to automatically control the centrifugal dehydrator 13.
FIG. 2 is a schematic view of a first embodiment of the sewage treatment system according to the present invention and a sludge treatment system for effectively reducing the water content of the sludge, the system including a sewage pretreatment system and a sludge treatment system for effectively reducing the water content of the sludge. The sludge treatment system for effectively reducing the water content of the sludge is the same as the sludge treatment system for effectively reducing the water content of the sludge in the embodiment of fig. 1, and thus the details are not repeated.
The sewage treatment system includes a primary treatment unit, an intermediate water tank 25, and a clarification unit 24. The clarifying device 24 is arranged between the primary treatment device and the intermediate water tank 25, and is used for further settling the sewage and removing scaling substances.
In this embodiment, the primary treatment device includes a grid 21, a sewage adjusting tank 22, a mixing tank 23, and the like, which are arranged in this order, and performs primary treatment on the incoming sewage. It is understood that one or more, one or more than one, of the grating 21, the sewage adjusting tank 22, the mixing tank 23 and the like can be arranged according to different sewage quality requirements.
Since the garbage leachate discharged from the garbage bin contains a large amount of solid particles, in order to prevent the solid particles from entering the sewage adjusting tank 22, the grid 21 is disposed at the water inlet of the sewage adjusting tank 22 for primarily filtering the sewage to remove the solid particles having a particle size of more than 0.75-1 mm. The sewage filtered by the grating 21 naturally flows into the sewage adjusting tank 22, the sewage adjusting tank 22 is used for carrying out homogeneous uniform treatment on the sewage, the variation range of the hydraulic power and water quality load of subsequent treatment facilities is reduced, the early-stage condition is created for maintaining the stable operation of the system, and the hydraulic retention time of the sewage adjusting tank 22 is 7-10 days so as to achieve the purpose of homogeneous uniform amount.
The sewage treated by the sewage adjusting tank 22 is conveyed to the mixing tank 23 by a water pump and the like, and is subjected to flocculation, sedimentation, pH value adjustment and the like. The mixing tank 23 is provided with a lime feeding system and a flocculation feeding system, slaked lime dry powder is input through the lime feeding system, and the pH value of the mixing tank 23 is adjusted to be between 10.5 and 12.0 by controlling the adding amount of the slaked lime dry powder; and a flocculating agent is added through a flocculating and feeding system to generate a flocculating and mixing reaction (such as PAM mixing reaction) with the sewage, and solid particles in the sewage are preliminarily removed.
The sewage treated by the primary treatment device is conveyed to a clarification device 24 for continuous sedimentation treatment. In this embodiment, the clarification device 24 may use a mechanical stirring clarifier to perform stirring clarification treatment on the sewage. The treated filtrate is output to the intermediate tank 25, and the sludge and scum are conveyed to the sludge tank 11 for treatment by a sludge treatment system that effectively reduces the water content of the sludge, and the treatment process is as described in the above embodiment, and thus is not described again. The filtrate in the reservoir 17, treated by a sludge treatment system that effectively reduces the water content of the sludge, can be output to a clarification device 24 for treatment as sewage.
After entering the intermediate water tank 25, the filtrate is precipitated in the intermediate water tank 25, the filtrate is output to a subsequent evaporation system, a biochemical system and the like, and the sludge is sent to the sludge tank 11 and is treated by a sludge treatment system which effectively reduces the water content of the sludge.
The embodiment combines a sewage pretreatment system and a sludge treatment system which can effectively reduce the water content of the sludge, and can effectively treat the sewage and the sludge.
Fig. 3 is a schematic diagram of a second embodiment of the sewage and sludge treatment system for effectively reducing the water content of the sludge according to the present invention, which is different from the first embodiment in that the clarification device is a multi-stage clarification device, and other structures are substantially the same as those in the previous embodiment, and thus are not repeated.
The multi-stage clarifier apparatus includes a primary clarifier 241 and a secondary clarifier 242 sequentially connected between the primary treatment apparatus and the intermediate water tank 25.
The primary clarifier 241 is connected to the mixing tank 23, and the sewage treated by the mixing tank 23 is output to the primary clarifier 241 through a water pump and the like, and is primarily precipitated by the primary clarifier 241. The primary clarifier 241 may be a closed radial clarifier including a mud scraper disposed at the bottom for scraping mud and a scum scraper disposed at the upper for scraping scum. The mud scraper and the scum scraping device are used for periodically scraping settled mud and floating scum to avoid the accumulation of the mud and the scum. Sludge and scum scraped by the mud scraper and the scum scraping device are input into a sludge tank 11 and are treated by a sludge treatment system which effectively reduces the water content of the sludge.
The sewage primarily settled by the primary clarifier 241 flows into the secondary clarifier 242, and secondary settlement is performed by the secondary clarifier 242. The secondary clarifier 242 may also be a closed radial clarifier including a mud scraper disposed at the bottom for scraping mud and a scum scraper disposed at the top for scraping scum. The mud scraper and the scum scraping device are used for periodically scraping settled mud and floating scum to avoid the accumulation of the mud and the scum. Sludge and scum scraped by the mud scraper and the scum scraping device are input into a sludge tank 11 and are treated by a sludge treatment system which effectively reduces the water content of the sludge. Of course, the primary clarifier 241 and the secondary clarifier 242 may be other clarifiers.
The sewage subjected to the precipitation treatment by the secondary clarifier 242 flows into the intermediate water tank 25, and after standing, the supernatant is conveyed to an evaporation system and the like for subsequent treatment. Through the system treatment, the purposes of removing suspended substances, colloidal substances, heavy metal ions and hardness in sewage and converting the combined ammonia nitrogen into free ammonia nitrogen are achieved, and necessary conditions are provided for subsequent evaporation and ammonia distillation. When the system is used for sewage pretreatment, leachate in the garbage bin is collected, filtered by the grating 21 and then enters the sewage adjusting tank 22 for homogenization and quantity equalization; then, the lime slake is conveyed to the mixing tank 23 through a water pump and the like, and is subjected to mixing reaction (such as PAM mixing reaction) with a flocculating agent input by a flocculation feeding system, the slaked lime dry powder conveyed by the lime feeding system from a lime storage bin is controlled in the feeding amount of the slaked lime dry powder, the pH value of the mixing tank 23 is adjusted and controlled to be 10.5-12.0, the leaching solution after the mixing reaction is conveyed to the primary clarifier 241 through a pump for primary precipitation, then flows into the secondary clarifier 242, and the leaching solution after the secondary precipitation flows into the intermediate water tank 25. The whole treatment process can effectively precipitate the sewage, so as to achieve the purposes of removing suspended matters, colloidal substances, heavy metal ions and hardness in the leachate and converting the combined ammonia nitrogen into the free ammonia nitrogen, ensure the reliable operation of a subsequent treatment system (such as an evaporation system), improve the stability, the reliability and the like of the sewage treatment system. The settled sludge and scum of the primary clarifier 241 and the secondary clarifier 242 are periodically discharged into a sludge tank 11 of a sludge treatment system which effectively reduces the water content of the sludge, the subsequent treatment of the sludge is carried out, the filtrate in the treated storage tank 17 can be output to the primary clarifier 241 for continuous treatment, the synchronous treatment of the sludge and the sewage is realized, and the pollution to the environment is avoided.
As shown in fig. 4, a third embodiment of the sewage and sludge treatment system for effectively reducing the water content of the sludge according to the present invention is different from the second embodiment in that the clarification device is a multi-stage clarification device, the multi-stage clarification device comprises a primary clarifier 241, a descaling mixing tank and a secondary clarifier 242 sequentially connected between the primary treatment device and the intermediate water tank 25, and other structures are substantially the same as those of the embodiment of fig. 3, and thus are not repeated.
The primary clarifier 241 is connected to the mixing tank 23, and the sewage treated by the mixing tank 23 is output to the primary clarifier 241 through a water pump and the like, and is primarily precipitated by the primary clarifier 241. Sludge and scum scraped by the mud scraper and the scum scraping device are input into a sludge tank 11 and are treated by a sludge treatment system which effectively reduces the water content of the sludge.
The sewage primarily precipitated by the primary clarifier 241 enters a descaling mixing tank for removing scaling substances. The descaling mixing tank can adopt a sodium carbonate mixing tank 243; of course, different mixing tanks may be selected depending on the water quality. In this embodiment, the sodium carbonate mixing tank 243 includes an automatic medicine feeding device for feeding sodium carbonate into the sodium carbonate mixing tank 243, and a feeding system for supplying sodium carbonate to the automatic medicine feeding device. Sodium carbonate is automatically added into the mixing tank through the feeding system and the automatic dosing device, and scaling substances (such as calcium, magnesium and the like) in the sewage are precipitated and removed, so that the influence of the scaling substances on a subsequent system is avoided.
Further, by a sludge treatment system for effectively reducing the water content of the sludge, the filtrate in the reservoir 17 can be output to the sodium carbonate mixing tank 243 to promote the scale removal reaction and remove the scaling substances.
The sewage treated by the descaling mixing tank flows into the secondary clarifier 242, and secondary sedimentation is performed by the secondary clarifier 242. Sludge and scum scraped by the mud scraper and the scum scraping device are input into a sludge tank 11 and are treated by a sludge treatment system which effectively reduces the water content of the sludge.
The sewage subjected to the precipitation treatment by the secondary clarifier 242 flows into the intermediate water tank 25, and after standing, the supernatant is conveyed to an evaporation system and the like for subsequent treatment. Through the system treatment, the purposes of removing suspended substances, colloidal substances, heavy metal ions and hardness in sewage and converting the combined ammonia nitrogen into free ammonia nitrogen are achieved, and necessary conditions are provided for subsequent evaporation and ammonia distillation.

Claims (4)

1. A sludge treatment system for effectively reducing the water content of sludge comprises a sludge pool connected with the sludge and a dehydration treatment system for dehydrating the sludge; it is characterized in that a sludge concentration treatment device is arranged between the sludge tank and the dehydration treatment system; and the sludge discharged from the sludge tank enters the sludge concentration treatment device for concentration treatment, the supernatant of the sludge concentration treatment device is discharged, and the concentrated sludge enters the dehydration treatment system.
2. The sludge treatment system capable of effectively reducing the water content of the sludge according to claim 1, wherein the sludge concentration treatment device comprises one or more sludge concentration tanks provided with stirring devices; each sludge concentration tank comprises a sludge inlet, a sludge outlet, a filtrate outlet connected with the dehydration treatment system and a supernatant outlet for discharging supernatant; the sludge inlet is connected with the outlet of the sludge tank and the sludge outlet of the dehydration treatment system, and is connected with sludge.
3. The sludge treatment system capable of effectively reducing the water content of the sludge as claimed in claim 2, wherein the dewatering treatment system comprises a centrifugal dehydrator, a filtrate buffer tank, a filtrate precipitator and a centrifugal water outlet tank which are connected in sequence; the filtrate outlet of the sludge concentration tank is connected with the inlet of the centrifugal dehydrator; discharging sludge dehydrated by the centrifugal dehydrator, and allowing filtrate to enter the filtrate buffer pool for energy dissipation; the filtrate after the energy dissipation of the filtrate buffer tank enters the filtrate precipitator for precipitation, and the precipitated filtrate is discharged to the centrifugal water outlet tank; and discharging the sludge in the filtrate buffer tank and the filtrate precipitator to the sludge concentration tank.
4. The system of claim 3, further comprising a reservoir connected to the centrifuge outlet tank.
CN202011259306.0A 2020-11-11 2020-11-11 Sludge treatment system capable of effectively reducing water content of sludge Withdrawn CN112390497A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011259306.0A CN112390497A (en) 2020-11-11 2020-11-11 Sludge treatment system capable of effectively reducing water content of sludge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011259306.0A CN112390497A (en) 2020-11-11 2020-11-11 Sludge treatment system capable of effectively reducing water content of sludge

Publications (1)

Publication Number Publication Date
CN112390497A true CN112390497A (en) 2021-02-23

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CN202011259306.0A Withdrawn CN112390497A (en) 2020-11-11 2020-11-11 Sludge treatment system capable of effectively reducing water content of sludge

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