CN112939414A - Short-time efficient sludge concentration system - Google Patents
Short-time efficient sludge concentration system Download PDFInfo
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- CN112939414A CN112939414A CN202110295145.9A CN202110295145A CN112939414A CN 112939414 A CN112939414 A CN 112939414A CN 202110295145 A CN202110295145 A CN 202110295145A CN 112939414 A CN112939414 A CN 112939414A
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- sludge
- pipe
- sedimentation zone
- secondary sedimentation
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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
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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
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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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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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
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
Abstract
The invention discloses a short-time efficient sludge concentration system, which comprises: the main tank body is internally provided with a mixing tank, a primary sedimentation zone and a secondary sedimentation zone in sequence from front to back, the top of the mixing tank is communicated with the top of the primary sedimentation zone, the primary sedimentation zone and the secondary sedimentation zone are separated by a guide wall, and the bottoms of the primary sedimentation zone and the secondary sedimentation zone are communicated through a through hole below the guide wall; the water outlet channel is arranged at the upper part of the secondary sedimentation area in the main tank body and is communicated with the upper part of the secondary sedimentation area; the mud inlet pipe is communicated with the bottom of the mixing tank; the sludge outlet pipe is communicated with the bottom in the secondary sedimentation zone; the stirrer and the dosing water distributor are arranged in the mixing tank; the dosing water distributor is connected with the dosing pipe; the aeration pipe is arranged in the secondary sedimentation area; the sludge return pipe is connected between the secondary sedimentation area and the mixing tank; the exhaust pipe is connected with the sludge return pipe. The system can accelerate the sludge concentration process, reduce the sludge retention time, reduce the difficulty of odor collection, and realize the aims of improving the sludge dewatering efficiency, reducing the operation cost and being environment-friendly.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a short-time efficient sludge concentration system.
Background
Along with the continuous, rapid and stable development of economy, the scale of urban sewage treatment in China is increased day by day, and the sludge yield is correspondingly increased. According to statistics, the sludge yield in China in 2019 is over 5000 ten thousand tons (calculated by water content of 80%). However, since 'heavy water and light mud' has long been used in China, the sludge treatment and disposal is not synchronously promoted with sewage treatment, the problem of sludge treatment and disposal is not effectively solved, and the situation is very severe. Excess sludge concentration generated by a biochemical pool of a sewage plant is the first step of sludge treatment, wherein the concentration is to separate part of water in sludge particles from sludge, so that the scale and the operating cost of subsequent sludge treatment are reduced, generally, the water content of the excess sludge is 99-99.5%, the water content can reach 96-98% after concentration, if the water content is calculated according to 99% and 98% of the water content of the excess sludge, the volume of the concentrated sludge is reduced to half of the volume of the sludge, and the reduction is very obvious.
The existing sludge concentration methods mainly comprise gravity concentration, mechanical concentration, air flotation concentration and the like. Gravity concentration is essentially a precipitation process, belongs to compression precipitation, and through crowding and compression processes, the sludge concentration is further improved, and supernatant liquid on the upper layer is overflowed and discharged, so that sludge concentration is realized. The traditional gravity concentration has the defects of low power consumption, strong buffering capacity and wide application, but also has the defects of large occupied area (generally, the retention time is more than 12 hours), easy phosphorus release (researches show that the sludge stays for more than 8 hours, the phosphorus release speed is greatly accelerated), large odor (the odor is generated by anaerobic reaction) and the like.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a short-time efficient sludge concentration system, which can solve the problems of large occupied area, easy phosphorus release, large odor and the like of the conventional sludge concentration tank for gravity sludge concentration.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a short-time efficient sludge concentration system, which comprises:
the system comprises a main tank body, a mixing tank, a primary sedimentation zone, a secondary sedimentation zone, a water outlet channel, a guide wall, a sludge inlet pipe, a sludge outlet pipe, an aeration pipe, a sludge return pipe, a dosing water distributor, a stirrer and an exhaust pipe; wherein the content of the first and second substances,
the mixing tank, the primary sedimentation zone and the secondary sedimentation zone are sequentially arranged in the main tank body from front to back, the top of the mixing tank is communicated with the top of the primary sedimentation zone, the primary sedimentation zone and the secondary sedimentation zone are separated by the guide wall arranged from top to bottom, and the bottoms of the primary sedimentation zone and the secondary sedimentation zone are communicated with each other through the through hole below the guide wall;
the water outlet channel is arranged at the upper part of the secondary sedimentation zone in the main tank body and is communicated with the upper part of the secondary sedimentation zone;
the sludge inlet pipe is communicated with the bottom in the mixing tank;
the sludge outlet pipe is communicated with the bottom in the secondary sedimentation zone;
the stirrer is arranged in the mixing tank;
the dosing water distributor is arranged in the mixing tank and is connected with the dosing pipe;
the aeration pipe is arranged in the secondary sedimentation area;
the sludge return pipe is connected between the secondary sedimentation area and the mixing tank;
the exhaust pipe is connected with the sludge return pipe.
According to the technical scheme provided by the invention, the short-time efficient sludge concentration system provided by the embodiment of the invention has the beneficial effects that:
the main tank body consists of the mixing tank, the primary sedimentation area and the secondary sedimentation area, so that a central pipe water distribution mode of a traditional sludge concentration tank is eliminated, the sludge concentration effect is good, the influence of sludge inlet of a sludge inlet pipe on the concentrated sludge in the tank is small, and the impact load resistance of the system is strong; the sludge concentration area in the main tank body is not provided with electromechanical equipment, so that the defects of corrosion of equipment, difficulty in maintenance, odor overflow and the like after odor is collected by a traditional sludge concentrator with a cover are overcome; the sludge retention time of the system is short, generally below 6h, and due to the fact that the sludge retention time is shortened, the release of phosphorus in sludge can be effectively avoided, the load of factory sewage treatment cannot be increased, and the sludge concentration efficiency is improved. The system solves the problems of high suspended matter concentration and sludge leakage of the supernatant of the traditional sludge concentration tank, and is additionally provided with a flocculating agent adding system and a sludge reflux system to strengthen the sludge precipitation effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a short-term, high-efficiency sludge thickener according to an embodiment of the present invention;
the parts corresponding to each mark in the figure are: 1-a mixing tank; 2-a primary precipitation zone; 3-a secondary sedimentation zone; 4-water outlet channel; 5-a guide wall; 6-sludge inlet pipe; 7-sludge outlet pipe; 8-an aerator pipe; 9-a sludge return pipe; 10-a medicine feeding pipe; 11-adding a medicine water distributor; 12-a stirrer; 13-an exhaust pipe; 14-total pool body.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents 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 embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
Referring to fig. 1, an embodiment of the present invention provides a short-time efficient sludge concentration system, including:
the system comprises a main tank body, a mixing tank 1, a primary sedimentation zone 2, a secondary sedimentation zone 3, a water outlet channel 4, a guide wall 5, a sludge inlet pipe 6, a sludge outlet pipe 7, an aeration pipe 8, a sludge return pipe 9, a dosing pipe 10, a dosing water distributor 11, a stirrer 12 and an exhaust pipe 13; wherein the content of the first and second substances,
the mixing tank 1, the primary sedimentation zone 2 and the secondary sedimentation zone 3 are sequentially arranged in the main tank body from front to back, the top of the mixing tank 1 is communicated with the top of the primary sedimentation zone 2, the primary sedimentation zone 2 is separated from the secondary sedimentation zone 3 through the guide wall arranged from top to bottom, and the bottoms of the primary sedimentation zone 2 and the secondary sedimentation zone 3 are communicated with each other through a through hole below the guide wall;
the water outlet channel is arranged at the upper part of the secondary sedimentation zone 3 in the main tank body and is communicated with the upper part of the secondary sedimentation zone 3;
the sludge inlet pipe 6 is communicated with the bottom in the mixing tank 1;
the sludge outlet pipe 7 is communicated with the bottom in the secondary sedimentation zone 3;
the stirrer 12 is arranged in the mixing tank 1;
the dosing water distributor is arranged in the mixing tank 1 and is connected with the dosing pipe 10;
the aeration pipe 8 is arranged in the secondary sedimentation zone 3;
the sludge return pipe 9 is connected between the secondary sedimentation area 3 and the mixing tank 1;
the exhaust pipe 13 is connected with the sludge return pipe 9.
In the system, the inclination angle between the inclined wall of the lower sludge hopper of the primary settling zone 2 and the horizontal plane is more than 45 degrees and less than 60 degrees;
the water outlet channel 4 is communicated with the upper part of the secondary sedimentation zone 3 through a water outlet weir.
In the system, the water inlet end of the sludge return pipe 9 is a horn-shaped inlet, and the aeration end of the aeration pipe 8 is communicated into the horn-shaped inlet. Through the cooperation of the sludge return pipe and the aeration pipe that set up like this, formed air stripping sludge return mechanism, concentrated back mud mixes with advancing mud, strengthens mud adsorption efficiency on the one hand, improves concentration efficiency, and on the other hand avoids the too high condition of blocking up out the mud pipeline of concentration tank bottom mud concentration through air stripping disturbance effect.
In the system, the sludge outlet pipe 7 is connected with an external sludge pump.
In the above system, the exhaust pipe 13 is connected to an external deodorization pipe. Can well discharge the odor in the main tank body.
In the system, the total tank body is a closed structure tank body provided with a top cover. The total tank with the structure can avoid the leakage of odor during concentration and secondary environmental pollution.
According to the short-time high-efficiency sludge concentration system, the main tank body of the system consists of the mixing tank, the primary sedimentation area and the secondary sedimentation area, the water distribution mode of the central pipe of the traditional sludge concentration tank is eliminated, the sludge concentration effect is good, the influence of sludge inlet of the sludge inlet pipe on the concentrated sludge in the tank is small, and the impact load resistance of the system is strong; the main tank body is of a vertical flow sedimentation tank type, no electromechanical equipment is arranged in the sludge concentration area, the main tank body is provided with a reinforced concrete top cover, the maintenance is simple, the odor is easy to collect without overflowing, and the defects of corrosion of equipment, difficulty in maintenance, odor overflowing and the like after the odor is collected by covering a traditional sludge concentrator are overcome; the sludge retention time of the system is short, generally below 6h, and due to the fact that the sludge retention time is shortened, the release of phosphorus in sludge can be effectively avoided, the load of factory sewage treatment cannot be increased, and the sludge concentration efficiency is improved. The system solves the problems of high suspended matter concentration and sludge leakage of the supernatant of the traditional sludge concentration tank, and is additionally provided with a flocculating agent adding system and a sludge reflux system to strengthen the sludge precipitation effect.
The embodiments of the present invention are described in further detail below.
The embodiment of the invention provides a short-time efficient sludge concentration system, which comprises: the main tank body adopts a combined structure, and the interior of the main tank body is divided into a mixing tank 1, a primary sedimentation zone 2 and a secondary sedimentation zone 3; the primary sedimentation zone 2 and the secondary sedimentation zone 3 are separated by a guide wall 5, the lower end part of the guide wall 5 is provided with a through hole, and the primary sedimentation zone 2 and the secondary sedimentation zone 3 are communicated through the through hole at the lower end of the guide wall 5; a sludge inlet pipe 6 for introducing sludge is arranged at the lower part of the front end of the mixing tank 1, a dosing water distributor 11 connected with a dosing pipe 10 is arranged in the mixing tank 1, and a stirrer 12 is arranged in the mixing tank 1; the outlet of the sludge return pipe 9 is arranged in the mixing tank 1; the included angle between the inclined wall of the sludge hopper at the lower part of the primary sedimentation zone 2 and the horizontal plane is more than 45 degrees and less than 60 degrees; the upper part of the secondary sedimentation zone 3 is provided with a water outlet channel 4 connected through a water outlet weir, a horn-shaped inlet at the bottom of a sludge return pipe 9 is arranged in the secondary sedimentation zone 3, an aeration pipe 8 is arranged in the secondary sedimentation zone 3, an air outlet of the aeration pipe 8 is introduced into the horn-shaped inlet at the bottom of the sludge return pipe 9, the aeration pipe 8 is used for realizing air stripping to realize that sludge returns to the mixing tank 1, and gas after air stripping is discharged to a deodorization pipeline through an exhaust pipe 13 connected with a tee joint at the rear end of the sludge return pipe 9; a sludge outlet pipe 7 for outputting sludge is arranged at the lower part of the secondary sedimentation zone 3, and the sludge outlet pipe 7 is connected with a sludge pump outside the sludge concentration system.
When the sludge concentration system carries out sludge concentration, the residual sludge enters the mixing tank 1 through the sludge inlet pipe 6, the flocculant liquid medicament enters the medicament adding pipe 10 and enters the mixing tank 1 through the medicament adding water distributor 11, and the residual sludge is uniformly mixed under the combined action of the stirrer 12 arranged in the mixing tank 1; when the sludge flows back, the aeration pipe 8 is used for introducing air, the sludge at the bottom of the secondary sedimentation zone 3 flows back to the mixing tank 1 through the sludge return pipe 9 under the action of gas stripping, and the gas after gas stripping is discharged to a connected deodorization pipeline through the exhaust pipe 13; the method comprises the following steps that residual sludge enters a mixing tank 1 to be mixed with return sludge and a flocculating agent, the sludge return and the flocculating agent are selectively started according to the concentration of a sludge outlet pipe and the water quality of supernatant, the sludge enters a primary settling zone 2 after passing through the mixing tank 1 to complete primary settling, a sludge layer is formed at the bottom of the primary settling zone 2, the sludge passes through the primary settling zone 2 and enters a secondary settling zone 3 together with the supernatant, the supernatant flows towards an upper water outlet channel 4 after the mixed sludge in the primary settling zone 2 enters the secondary settling zone 3, the supernatant passes through the formed high-concentration sludge layer in the flowing process, and the suspended sludge is partially intercepted; after penetrating through the sludge layer, carrying out secondary gravity sedimentation on suspended particles in water, and further downwards extruding the sludge layer at the lower part; supernatant is discharged out of the system from a water outlet channel 4 at the upper part of the secondary sedimentation zone 3, and sludge is settled to form a concentrated sludge layer at the lower part and is discharged out of the system through a sludge outlet pipe 7; the aeration pipe 8 that comes from the sewage plant air-blower stretches into the tubaeform import of backflow sludge pipe 9 bottom, on the one hand through the air stripping effect with 3 bottoms high concentration concentrated mud refluxes of secondary sedimentation district to mixing tank 1, on the other hand avoids mud excessive deposit to block up out the mud pipe through the disturbance effect of aeration.
Example (b):
the embodiment of the invention provides a short-time efficient sludge concentration system, which adopts the following sludge concentration mode:
the treatment scale of a certain municipal sewage treatment plant is 3 ten thousand tons/day, and the concentration of the residual sludge in the secondary sedimentation tank of the sewage treatment plant is about 8000 mg/L. In the original process, the residual sludge directly enters a sludge storage tank, the sludge storage tank stays for 1h, and the discharged sludge is pumped to a belt filter press for dehydration. Because the original sludge storage tank has a small volume, and the intermittent sludge discharge mode of the secondary sedimentation tank causes low sludge concentration and large variation amplitude when entering the belt filter press, the water content of the filter-pressed sludge cake exceeds 82%, and the design requirement cannot be met. The sludge storage tank of the plant is transformed into two short-time high-efficiency sludge concentration systems, relevant data are monitored through an online sludge concentration meter on a sludge outlet pipeline and a sludge interface meter in the sludge tank, and the sludge level of the concentration tank and the effluent quality of supernatant are controlled, so that the effect of the invention is realized. After the implementation, the effective retention time of the sludge concentration system is 6h, and the ascending flow rate of the supernatant is lower than 01mm/s, the angle between the inclined wall of the cone body of the mud bucket of the concentration tank and the horizontal plane is more than 50 degrees, the ratio of the flow rate of air stripping return sludge to the flow rate of inlet sludge is 1: 1-3: 1, air stripping return flow is not continuously operated, the concentration of sludge in a mud outlet pipe reaches 25000mg/L under the condition that a flocculating agent is not added, and the water content reaches 78% after the treatment of a belt filter press; the amount of mud entering the belt filter press is reduced by 425m per day by accounting3The reduction range is 68%, the sludge output after filter pressing is reduced by 5t every day, and the reduction range is 18%, namely, the sludge concentration system effectively realizes sludge reduction and saves sludge treatment operation, medicament cost and outward sludge treatment cost.
According to the invention, through more reasonable structural design and selection of a proper tank type, the sludge concentration process is accelerated, the sludge retention time is reduced, the odor collection difficulty is reduced, the purposes of improving the sludge dewatering efficiency, reducing the operation cost and being environment-friendly are realized on the premise of not increasing the floor area, and the device is particularly suitable for concentrating the residual sludge in a sewage plant with the weight of less than 5 million tons.
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 changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A short-time efficient sludge thickening system, comprising:
the system comprises a main tank body, a mixing tank (1), a primary sedimentation zone (2), a secondary sedimentation zone (3), a water outlet channel (4), a guide wall (5), a sludge inlet pipe (6), a sludge outlet pipe (7), an aeration pipe (8), a sludge return pipe (9), a dosing pipe (10), a dosing water distributor (11), a stirrer (12) and an exhaust pipe (13); wherein the content of the first and second substances,
the mixing tank (1), the primary sedimentation zone (2) and the secondary sedimentation zone (3) are sequentially arranged in the main tank body from front to back, the top of the mixing tank (1) is communicated with the top of the primary sedimentation zone (2), the primary sedimentation zone (2) is separated from the secondary sedimentation zone (3) through the guide wall arranged from top to bottom, and the bottoms of the primary sedimentation zone (2) and the secondary sedimentation zone (3) are communicated with each other through a through hole below the guide wall;
the water outlet channel is arranged at the upper part of the secondary sedimentation zone (3) in the main tank body and is communicated with the upper part of the secondary sedimentation zone (3);
the sludge inlet pipe (6) is communicated with the bottom in the mixing tank (1);
the sludge outlet pipe (7) is communicated with the bottom in the secondary sedimentation zone (3);
the stirrer (12) is arranged in the mixing tank (1);
the dosing water distributor is arranged in the mixing tank (1) and is connected with the dosing pipe (10);
the aeration pipe (8) is arranged in the secondary sedimentation zone (3);
the sludge return pipe (9) is connected between the secondary sedimentation area (3) and the mixing tank (1);
the exhaust pipe (13) is connected with the sludge return pipe (9).
2. The short-time high-efficiency sludge concentration system according to claim 1, wherein the inclination angle between the inclined wall of the lower sludge hopper of the primary settling zone (2) and the horizontal plane is more than 45 degrees and less than 60 degrees;
the water outlet channel (4) is communicated with the upper part of the secondary sedimentation zone (3) through a water outlet weir.
3. The short-term high-efficiency sludge concentration system according to claim 1 or 2, wherein the water inlet end of the sludge return pipe (9) is a trumpet-shaped inlet, and the aeration end of the aeration pipe (8) is communicated with the trumpet-shaped inlet.
4. The short time high efficiency sludge thickening system according to claim 1 or 2, wherein the sludge outlet pipe (7) is connected to an external sludge pump.
5. The short time high efficiency sludge thickening system according to claim 1 or 2, wherein the exhaust pipe (13) is connected to an external deodorizing pipe.
6. The short-time efficient sludge thickening system according to claim 1 or 2, wherein the total tank body is a closed structure tank body provided with a top cover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110295145.9A CN112939414A (en) | 2021-03-19 | 2021-03-19 | Short-time efficient sludge concentration system |
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| CN202110295145.9A CN112939414A (en) | 2021-03-19 | 2021-03-19 | Short-time efficient sludge concentration system |
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| CN112939414A true CN112939414A (en) | 2021-06-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114702150A (en) * | 2022-03-30 | 2022-07-05 | 乾通环境科技(苏州)有限公司 | Pretreatment system for high-turbidity oil-containing seawater for small and medium-sized seawater desalination plants |
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2021
- 2021-03-19 CN CN202110295145.9A patent/CN112939414A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114702150A (en) * | 2022-03-30 | 2022-07-05 | 乾通环境科技(苏州)有限公司 | Pretreatment system for high-turbidity oil-containing seawater for small and medium-sized seawater desalination plants |
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