CN114940575A - Device and method for conditioning sludge - Google Patents
Device and method for conditioning sludge Download PDFInfo
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- CN114940575A CN114940575A CN202210594859.4A CN202210594859A CN114940575A CN 114940575 A CN114940575 A CN 114940575A CN 202210594859 A CN202210594859 A CN 202210594859A CN 114940575 A CN114940575 A CN 114940575A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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Abstract
The invention discloses a device and a method for conditioning sludge, which comprises the following steps: the device comprises a conditioning tank, a medicine dissolving component, a spiral pusher and a control component; the top end of the conditioning tank is provided with a static premixing component, and the static premixing component is provided with a sludge inlet, a flocculating agent inlet and a conditioner inlet; a first channel is formed between the outlet of the conditioning tank and the sludge inlet, and a second channel is formed between the medicine dissolving component and the flocculant inlet; the top end of the conditioning tank is also provided with a stirrer and a liquid level sensor, and the control component is in communication connection with the medicine dissolving component, the spiral pusher, the circulating pump, the medicine adding flowmeter, the stirrer and the liquid level sensor and is used for controlling the addition of the flocculating agent and the conditioning agent and the circulation and stirring of the sludge. According to the invention, the addition of the flocculating agent and the conditioner can be accurately and intelligently controlled according to different sludge conditioning requirements, so that the uniform and sufficient mixing is ensured, the high efficiency and high quality of sludge conditioning are realized, and the conditioned sludge meets the standard of deep sludge dewatering treatment.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a device and a method for conditioning sludge.
Background
The municipal sludge has high organic matter content, water content and the like, has a loose structure, and cannot meet the standard when being directly dewatered. At present, mud is all can be tempered before deep dehydration handles, if add flocculating agent such as PAM, can make the particulate matter in the mud assemble into the wadding, further reduces water content.
For example, CN210855782U provides an automatic feeding flocculation conditioning tank, which comprises a flocculation conditioning component, a flocculation conditioning agent supply component; the flocculation conditioning component is communicated with the flocculation conditioning agent supply component; the flocculation conditioning component comprises a tank body, wherein a stirring part is connected in the tank body in a rotating mode, the stirring part comprises a stirring shaft, a plurality of stirring parts are fixedly connected to the stirring shaft, the stirring shaft is connected with a driving motor, and the top of the tank body is communicated with a flocculation conditioning agent supply component through a conveying pipeline. The flocculation conditioning liquid is fully stirred, so that the cycle of flocculation settling is shortened, and the production efficiency is improved.
However, in the prior art, when the flocculant, the conditioner and the like are directly stirred and mixed with the sludge in a single-point adding manner, the flow state of the sludge is annular flow, the sludge cannot be fully mixed with the flocculant and the conditioner, the conditioning time is long, the conditioning efficiency is low, and the conditioned sludge cannot meet the requirements of a subsequent efficient deep dehydration process.
Therefore, how to ensure accurate and sufficient mixing of the sludge, the flocculating agent and the conditioner so as to realize high efficiency and high quality of sludge conditioning, and automatic and accurate control is a problem to be solved by those skilled in the art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the device and the method for conditioning the sludge, which can accurately control the addition of the flocculating agent and the conditioning agent according to different sludge conditioning requirements, and the flocculating agent, the conditioning agent and the sludge are mixed in the static premixing component, so that the high efficiency and the high quality of the sludge conditioning process are ensured, and the conditioned sludge meets the requirements of a high-efficiency deep dehydration process.
In a first aspect, the present invention provides an apparatus for conditioning sludge, comprising: the device comprises a conditioning tank, a medicine dissolving component, a spiral pusher and a control component;
the top end of the conditioning tank is provided with a static premixing component, the static premixing component is provided with at least three inlets, the first inlet is a sludge inlet, the second inlet is a flocculant inlet and is communicated with a medicine dissolving component, and the third inlet is a conditioner inlet and is communicated with a spiral pusher;
a first channel is formed between the outlet of the conditioning tank and the first inlet, a circulating pump is arranged on the first channel, a second channel is formed between the medicine dissolving assembly and the third inlet, and a medicine feeding pump and a medicine feeding flow meter are arranged on the second channel;
the top end of the conditioning tank is also provided with a stirrer and a liquid level sensor, and the control component is in communication connection with the medicine dissolving component, the spiral pusher, the circulating pump, the medicine adding flowmeter, the stirrer and the liquid level sensor and is used for controlling the addition of a flocculating agent, the addition of a conditioning agent and the circulation and stirring of sludge.
Furthermore, a spiral curved surface structure is arranged in the static premixing component, the first inlet and the third inlet are both arranged at the top end of the static premixing component, sludge enters the top layer inlet of the spiral curved surface structure through the first inlet, a conditioner enters the top layer outlet of the spiral curved surface structure through the third inlet, the second inlet is arranged on the side wall of the static premixing component, and a flocculating agent enters the middle layer of the spiral curved surface structure through the second inlet.
Furthermore, the number of layers of the spiral curved surface structure is 3-4, the inclination angle of each layer is 45-60 degrees, the screw pitch between each layer is 15-20cm, and the screw pitches increase from top to bottom in sequence.
In a second aspect, the invention also provides a method for conditioning sludge by using the above device, comprising the following steps:
s1: adding a predetermined amount of sludge to be conditioned into a conditioning tank through a static premixing component, monitoring the liquid level height of the conditioning tank in real time, controlling a stirrer to be started, adjusting stirring parameters of the stirrer, and stirring the sludge;
s2: preparing a flocculating agent in the medicine dissolving component, opening a first channel and a second channel, mixing the flocculating agent and sludge returned by the first channel in a static premixing component to form a first mixture, feeding the first mixture into a conditioning tank, and closing the second channel after the flocculating agent reaches a preset amount;
s3: starting the spiral pusher, pushing the conditioner into the static premixing component, mixing the conditioner with the sludge returned through the first channel in the static premixing component to form a second mixture, and feeding the second mixture into a conditioning tank;
s4: and after the conditioner is added to a preset amount, closing the spiral pusher and the first channel, adjusting the stirring parameters of the stirrer, conditioning the sludge in the conditioning tank, opening a sludge outlet valve of the conditioning tank after the conditioning of the sludge is finished, and discharging the conditioned sludge into the dehydrator.
Further, adding a predetermined amount of sludge to be conditioned into the conditioning tank through a static premixing component, which specifically comprises the following steps:
s11: opening a first inlet, and injecting sludge to be conditioned into the static premixing component through the first inlet;
s12: and collecting data of a flow meter at the sludge inlet in real time, and stopping adding after a preset amount is reached.
Further, the liquid level height of jar is taked care of in real-time supervision, the opening of control agitator to the stirring parameter of adjustment agitator specifically includes:
s13: when the liquid level reaches a set height, starting a stirrer to stir the added sludge, wherein the rotating speed of the stirrer is 25-30 rpm/min;
s14: after the addition is stopped, the rotating speed of the stirrer is adjusted to 35-45 rpm/min.
Further, the step S2 specifically includes:
s21: two flocculants, namely polyaluminum chloride solution and polyacrylamide solution, are arranged in the medicine dissolving component, wherein the concentration of the polyaluminum chloride solution is 20-25% kg/m 3 The concentration of the polyacrylamide solution is 0.2 to 0.3 percent kg/m 3 Completion of configurationThen stirring for 25-35 min;
s22: after the conditioned sludge begins to be added, opening a first channel and a second channel, collecting data of a dosing flowmeter in real time, mixing two flocculants with the sludge returned through the first channel in a static premixing assembly through the second channel to form a first mixture, and feeding the first mixture into a conditioning tank;
s23: controlling the addition amount of the flocculating agent, and closing the second channel after the ratio of the amount of the polyaluminum chloride and the polyacrylamide to the amount of the oven-dried sludge of the sludge to be conditioned reaches 2-5% and 0.1-0.3%, respectively.
Further, the flow velocity of the sludge in the first channel is 70-90m 3 H, the flow rate of the polyaluminium chloride solution in the second passage is 3-4m 3 The flow rate of the polyacrylamide solution is 6-7m 3 /h。
Further, the proportion of the added conditioner to the oven-dried sludge to be conditioned is 12-16%.
Further, the step S4 specifically includes:
s41: after the spiral pusher and the first channel are closed, the rotating speed of the stirrer is adjusted to be 25-30 rpm/min;
s42: after stirring for 20-25min, opening a sludge outlet valve and a sludge outlet pump of the conditioning tank, and discharging sludge into a dehydrator;
s43: and after the sludge in the conditioning tank is completely discharged into the dehydrator, closing the stirrer and stopping stirring.
The device and the method for conditioning sludge provided by the invention at least have the following beneficial effects:
(1) and respectively blending the sludge, the added flocculating agent and the conditioner, and monitoring and controlling the adding amount to realize accurate automatic control of mixing with the sludge.
(2) The static coagulation component realizes the respective mixing of the circulating sludge, the flocculating agent and the conditioner, ensures the full and uniform mixing, and accelerates the dissolution and mixing of the flocculating agent and the conditioner by combining the layered stirring of the stirrer in the conditioning tank, thereby improving the efficiency of sludge conditioning and saving the cost of the flocculating agent and the conditioner.
(3) The spiral curved surface structure of the static premixing component and the inlet positions of the sludge, the flocculating agent and the conditioning agent are arranged, so that the sludge, the flocculating agent and the conditioning agent can be fully dissolved and mixed.
(4) The control assembly accurately controls the steps from the addition of the sludge, the flocculating agent and the conditioner to the mixing, circulating, stirring and the like, and the intelligent operation of the whole process flow for conditioning the sludge is realized.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for conditioning sludge according to the present invention;
FIG. 2 is a flow diagram of a method for conditioning sludge according to the present invention;
FIG. 3 is a partial cross-sectional structural view of a static premix assembly provided in accordance with the present invention.
Description of reference numerals: 1. a drug dissolving component; 2. a mud inlet flowmeter; 3. a static premix assembly; 4. a conditioning tank; 5. a dosing valve; 6. a dosing pump; 7. adding a medicine flow meter; 8. a liquid level sensor; 9. a stirrer; 10. a circulation valve; 11. a circulation pump; 12. a screw pusher; 13. a check valve; 14. a mud outlet valve; 15. a sludge outlet pump; 16. a first inlet; 17. a second inlet; 18. a third inlet; 19. a helical curved surface structure.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
As shown in fig. 1 and 3, an apparatus for conditioning sludge includes: a conditioning tank 4, a medicine dissolving component 1, a spiral pusher 12 and a control component;
the top end of the conditioning tank 4 is provided with a static premixing component 3, the static premixing component 3 is provided with at least three inlets, a first inlet 16 is a sludge inlet, a second inlet 17 is a flocculating agent inlet and is communicated with the medicine dissolving component 1, and a third inlet 18 is a conditioning agent inlet and is communicated with the spiral material pushing device 12. In the preferable scheme, a sludge inlet flowmeter 2 is arranged at the front end of a sludge inlet, and a static premixing component 3 is close to the edge position of the top end of a conditioning tank 4.
The static premixing component 3 is internally provided with a spiral curved surface structure 19, the first inlet 16 and the third inlet 18 are both arranged at the top end of the static premixing component 3, sludge enters the top layer inlet of the spiral curved surface structure 19 from the first inlet 16, a conditioner enters the top layer outlet of the spiral curved surface structure 19 through the third inlet 18, the second inlet 17 is arranged on the side wall of the static premixing component 3, and a flocculating agent enters the middle layer of the spiral curved surface structure 19 through the second inlet 17. The first inlet 16, the second inlet 17 and the third inlet 18 may be realized by flange connections. The helical curved structure 19 may be tubular or groove-shaped.
A first channel is formed between the outlet of the conditioning tank 4 and the first inlet 16, a circulating pump 11 is arranged on the first channel, a second channel is formed between the medicine dissolving component 1 and the third inlet 18, and a medicine feeding pump 6 and a medicine feeding flow meter 7 are arranged on the second channel. A circulation valve 10 and a check valve 13 are also arranged on the first channel to ensure that the sludge continuously returns from the outlet of the conditioning tank 4 to the inlet of the conditioning tank 4 along the first channel.
The flocculating agent and the conditioning agent are mixed with the sludge returned circularly in the static premixing component 3 before entering the conditioning tank 4, the sludge, the flocculating agent and the conditioning agent are in a relatively static relation in the mixing process, the sludge on the upper part and the lower part in the conditioning tank 4 can be mixed with the flocculating agent and the conditioning agent, and the mixing is more sufficient compared with the mixing in the conditioning tank 4 under the stirring environment.
The number of layers of the spiral curved surface structure 19 is 3-4, the inclination angle of each layer is 45-60 degrees, the thread pitch between each layer is 15-20cm, and the thread pitches increase from top to bottom in sequence.
The angle of each layer of curved surface in the spiral curved surface structure 19 is too small, the resistance of the circulating pump 11 when the sludge returns to the sludge inlet from the conditioning tank 4 through the first channel is large, the operation effect of the whole device is influenced, and the sludge inlet directly impacts the curved surface structure, so that the structure is easily damaged. The angle of the curved surface is too large, the flow rate of the sludge is high, the sludge is not sufficiently mixed with the flocculating agent and the conditioner, and the integral conditioning effect of the sludge is influenced.
The top of the conditioning tank 4 is also provided with a stirrer 9 and a liquid level sensor 8, the conditioning tank 4 and the static premixing component 3 are stainless steel finished products, the stirrer 9 is arranged on a tank cover of the conditioning tank 4, and a supporting beam of the static premixing component 3 is also arranged on a tank cover of the conditioning tank 4.
The stirrer 9 comprises a magnetic motor, a stirring rod and blades, wherein the stirring rod is provided with an upper group of blades, a middle group of blades and a lower group of blades at intervals.
The spiral curved surface structure 19 that adopts inside the static subassembly 3 that mixes that adopts can realize in the conditioning tank 4 mud through the circulation of first passageway and liquid flocculating agent and solid-state conditioner at the inside intensive mixing of static subassembly 3, combines the layering stirring of agitator 9 in the conditioning tank 4 again to accelerate dissolving and mixing of chemical agent, reach and practice thrift the conditioning time and save the medicament cost.
The outlet of the conditioning tank 4 also comprises a discharge channel, a sludge outlet valve 14 and a sludge outlet pump 15 are arranged on the discharge channel, and the sludge outlet valve 14 and the sludge outlet pump 15 are in a closed state in the sludge conditioning process. After the sludge is conditioned, the sludge outlet valve 14 and the sludge outlet pump 15 are opened, and the sludge is discharged into the dehydrator connected with the rear end.
The control component is in communication connection with the medicine dissolving component 1, the spiral pusher 12, the circulating pump 11, the medicine adding pump 6, the medicine adding flowmeter 7, the stirrer 9 and the liquid level sensor 8, and is used for controlling the addition of a flocculating agent, the addition of a conditioning agent and the circulation and stirring of sludge.
The control component adopts PLC linkage control and is in communication connection with the mud inlet flowmeter 2, the medicine adding valve 5, the medicine adding pump 6, the medicine adding flowmeter 7, the spiral material pusher 12, the liquid level sensor 8, the stirrer 9, the circulating valve 10, the circulating pump 11, the mud outlet valve 14 and the mud outlet pump 15.
The control assembly stores preset amount data of sludge to be conditioned, a flocculating agent and a conditioner, after the sludge conditioning is started, the flow data of each flowmeter in the sludge conditioning process is collected, each step of the sludge conditioning process is monitored, a pump and a valve are controlled to be opened, operation parameters are adjusted, and finally the sludge conditioning process is completed.
Example (b):
as shown in figure 2, the device for conditioning sludge is adopted for sludge conditioning, and comprises the following steps:
s1: adding a predetermined amount of sludge to be conditioned into a conditioning tank 4 through a static premixing component 3, monitoring the liquid level height of the conditioning tank 4 in real time, controlling a stirrer 9 to be started, adjusting stirring parameters of the stirrer 9, and stirring the sludge;
s2: preparing a flocculating agent in the medicine dissolving component 1, opening a first channel and a second channel, mixing the flocculating agent and sludge returned by the first channel in a static premixing component 3 to form a first mixture, feeding the first mixture into a conditioning tank 4, and closing the second channel after the flocculating agent reaches a preset amount;
s3: starting the spiral pusher 12, pushing the conditioner into the static premixing component 3, and mixing the conditioner and the sludge returned by the first channel in the static premixing component 3 to form a second mixture, wherein the second mixture enters the conditioning tank 4;
s4: after the conditioner is added to a preset amount, the spiral pusher 12 and the first channel are closed, the stirring parameters of the stirrer 9 are adjusted, the sludge in the conditioning tank 4 is conditioned, and after the conditioning of the sludge is finished, a sludge outlet valve 14 of the conditioning tank 4 is opened, and the conditioned sludge is discharged into the dehydrator.
The process of adding sludge specifically comprises the following steps:
the first inlet is opened, and the sludge to be conditioned is injected into the static premixing component 3 through the first inlet. The first inlet is a sludge inlet which is arranged at the top end of the static coagulation component 3, the sludge inlet is close to the top layer inlet of the spiral curved surface structure 19, and sludge flows into the conditioning tank 4 from top to bottom along the multilayer spiral curved surface structure 19 from the top layer inlet of the spiral curved surface structure 19.
And collecting data of the flow meter 2 at the sludge inlet in real time, and stopping feeding after a preset amount is reached.
In the process of entering the sludge, the speed of entering the sludge can be adjusted according to the real-time data of the sludge inlet flowmeter 2 and the flowing condition of the sludge in the static premixing component 3, so that the sludge can uniformly and smoothly enter the conditioning tank 4;
the liquid level height reaches a set height, the set height can be adjusted according to the condition of sludge to be conditioned, the position that the sludge reaches 1/3 or 1/2 and the like of the height of the conditioning tank 4 is monitored through the liquid level sensor 8, the stirrer 9 is started to stir the added sludge, the rotating speed of the stirrer 9 is 25-30rpm/min, the sludge reaches a preset amount, and after the addition is stopped, the rotating speed of the stirrer 9 is adjusted to 35-45 rpm/min.
Through step S1, the sludge to be conditioned is added to the conditioning tank 4 in a predetermined amount, the agitator 9 is started, and the speed of the agitator 9 is adjusted according to the amount of the added sludge, so as to improve the conditioning efficiency and prepare for subsequent mixing with the flocculant and the conditioner.
Before sludge conditioning, two flocculants are required to be prepared in the drug dissolving component 1 in advance, the two flocculants can be stored in different units of the drug dissolving component 1, and the two flocculants are respectively polyaluminium chloride solution and polyacrylamide solution, wherein the concentration of the polyaluminium chloride solution is 20% -25% kg/m 3 The concentration of the polyacrylamide solution is 0.2 to 0.3 percent kg/m 3 And after the preparation is finished, stirring all units for storing the flocculating agent for 25-35min to ensure that the solution is fully dissolved.
And opening the first channel and the second channel after the conditioned sludge begins to be added. The mud realizes the circulation flow who comes in and goes out to the mud inlet from conditioning tank 4 through first passageway, and meanwhile, two kinds of flocculating agents also flow to conditioning tank 4 through the second passageway, gather in real time and add the data of medicine flowmeter 7. The flocculant is mixed with the sludge returning through the first channel in the static pre-mix assembly 3 to form a first mixture, which enters the conditioning tank. The flocculating agent inlet is arranged on the side wall of the static premixing component 3, and the flocculating agent enters the middle layer of the spiral curved surface structure 19, which can be a second layer or a third layer from top to bottom.
The flow velocity of the sludge in the first channel is 70-90m 3 H, the flow rate of the polyaluminium chloride solution in the second passage is 3-4m 3 The flow rate of the polyacrylamide solution is 6-7m 3 H is used as the reference value. The circulating pump 11 in the first passage is a variable frequency circulating pump, and the flow velocity in the sludge is controlled to be 70-90m 3 The flow rates of the polyaluminium chloride solution and the polyacrylamide solution can be adjusted by the dosing pump 6 in the second channel and are respectively controlled to be 3-4m 3 H and 6 to 7m 3 /h。
The addition amount of the flocculating agent is controlled by collecting the data of the dosing flowmeter 7, and the second channel is closed after the ratio of the amount of the polyaluminium chloride to the amount of the oven dry sludge of the sludge to be conditioned reaches 2-5 percent and the ratio of the amount of the polyacrylamide to the amount of the oven dry sludge of the sludge to be conditioned reaches 0.1-0.3 percent.
The sludge flows through the first channel and enters the sludge inlet of the static premixing component 3, the sludge starts to flow layer by layer along the spiral curved surface structure 19 from the top layer inlet of the spiral curved surface structure 19, and the sludge is mixed with the added flocculating agent when flowing through the middle layer of the spiral curved surface structure 19, so that the flocculating agent and the sludge are mixed more fully, and the formed first mixture enters the upper part of the conditioning tank 4.
At the same time, the sludge in the lower part of the conditioning tank 4 continues to enter the first channel, and the circulation and mixing are carried out as above. The layered stirring of agitator 9 in the cooperation conditioning tank 4, the dissolution and the mixing of flocculating agent and mud are accelerated, improve the efficiency that the mud was taked care of, reach the effect of practicing thrift the time of taking care of and saving the medicament cost.
And (3) starting the spiral pusher 12, pushing the conditioner into the static premixing component 3, and mixing the conditioner with the sludge returned through the first channel in the static premixing component 3 to form a second mixture, wherein the second mixture enters the conditioning tank 4, and the ratio of the amount of the added conditioner to the amount of the absolutely dry sludge of the sludge to be conditioned is 12-16%.
The inlet of the conditioner is arranged at the top end of the static premixing component 3 and is close to the top outlet of the spiral curved surface structure 19, after entering the spiral curved surface structure 19, the sludge flows flatly on the top curved surface of the spiral curved surface structure 19, flows to the outlet to be mixed with the conditioner, and can achieve the purpose of uniform mixing through sufficient rolling and impact when flowing through the lower layers of spiral curved surface structures 19. Enters the mixer 9 in the conditioning tank 4 to be mixed layer by layer, so as to accelerate the dissolution and mixing of the conditioner and the sludge, and achieve the purposes of saving conditioning time and saving the cost of the conditioner.
The conditioner is solid matter, cement can be selected, the amount of polyaluminium chloride and polyacrylamide is the amount of the solid matter added when the flocculant is prepared, and the amount of the absolutely dry sludge is the weight of the sludge without water calculated according to the preset amount of the sludge to be conditioned and the measured water content.
After the flocculant and the conditioner are added, closing the spiral pusher 12 and the first channel, mixing the sludge with the flocculant and the conditioner, starting conditioning in the stirrer 9, and adjusting the rotating speed of the stirrer 9 to 25-30 rpm/min; after stirring for 20-25min, the standard of deep dehydration treatment is reached, a sludge outlet valve 14 and a sludge outlet pump 15 of the conditioning tank 4 are opened, and sludge begins to be discharged into a dehydrator; after the sludge in the conditioning tank 4 is completely discharged into the dehydrator, the stirrer 9 is turned off, and the stirring is stopped.
Comparative example 1:
on the basis of the examples, the entering amount of the flocculating agent and the conditioning agent is adjusted.
The proportion of the amount of the polyaluminium chloride to the amount of the oven-dried sludge of the sludge to be conditioned is 7-10%, and the proportion of the amount of the polyacrylamide to the amount of the oven-dried sludge of the sludge to be conditioned is 0.4-0.5%.
After the flocculant and the conditioner are added, closing the spiral pusher 12 and the first channel, mixing the sludge with the flocculant and the conditioner, starting conditioning in the stirrer 9, and adjusting the rotating speed of the stirrer 9 to 25-30 rpm/min; and after stirring for 20-25min, the standard of deep dehydration treatment can be achieved.
The proportion of the amount of the polyaluminum chloride to the amount of the oven-dried sludge of the sludge to be conditioned is 1 percent, and the proportion of the amount of the polyacrylamide to the amount of the oven-dried sludge of the sludge to be conditioned is 0.07 percent.
After the flocculant and the conditioner are added, closing the spiral pusher 12 and the first channel, mixing the sludge with the flocculant and the conditioner, starting conditioning in the stirrer 9, and adjusting the rotating speed of the stirrer 9 to 25-30 rpm/min; after stirring for 1h, the sludge still does not reach the standard of deep dehydration treatment.
Comparative example 2:
on the basis of the embodiment, the premixing step of the sludge, the flocculating agent and the conditioning agent in the static premixing component 3 and the circulation process of the sludge in the first channel are omitted.
S1: adding a predetermined amount of sludge to be conditioned into the conditioning tank 4, monitoring the liquid level height of the conditioning tank 4 in real time, controlling the stirrer 9 to be started, adjusting the stirring parameters of the stirrer 9, and stirring the sludge;
s2: preparing a flocculating agent in the medicine dissolving component 1, opening a second channel, enabling the flocculating agent to enter the conditioning tank 4, mixing the flocculating agent with the sludge in the conditioning tank 4, and closing the second channel after the flocculating agent reaches a preset amount;
s3: starting the spiral pusher 12 and pushing the conditioner into the conditioning tank 4;
s4: after the conditioner is added to a preset amount, the spiral pusher 12 is closed, the stirring parameters of the stirrer 9 are adjusted, the sludge in the conditioning tank 4 is conditioned, and after the conditioning of the sludge is finished, a sludge outlet valve 14 of the conditioning tank 4 is opened, and the conditioned sludge is discharged into the dehydrator.
Wherein the stirring parameters of the stirrer 9 are consistent with the stirring parameters in the examples.
The type and concentration of the flocculant and the type of conditioner are the same as in the examples. Namely, the concentration of the polyaluminium chloride solution is 20 to 25 percent kg/m 3 The concentration of the polyacrylamide solution is 0.2 to 0.3 percent kg/m 3 。
The proportion of the amount of the polyaluminium chloride to the amount of the oven-dried sludge of the sludge to be conditioned is 8 percent, and the proportion of the amount of the polyacrylamide to the amount of the oven-dried sludge of the sludge to be conditioned is 0.5 percent.
After the flocculant and the conditioner are added, closing the spiral pusher 12 and the first channel, mixing the sludge with the flocculant and the conditioner, starting conditioning in the stirrer 9, and adjusting the rotating speed of the stirrer 9 to 25-30 rpm/min; after stirring for 1h, the standard of deep dehydration treatment is achieved, a sludge outlet valve 14 and a sludge outlet pump 15 of the conditioning tank 4 are opened, and sludge begins to be discharged into a dehydrator; after the sludge in the conditioning tank 4 is completely discharged into the dehydrator, the stirrer 9 is turned off, and the stirring is stopped.
Compared with the comparative example 1 and the comparative example 2, the embodiment adopts the flocculating agent with proper concentration, and combines the mixing process of the sludge, the flocculating agent and the conditioning agent in the sludge conditioning device, namely the sludge circularly flows from the outlet of the conditioning tank 4 to the sludge inlet, the sludge, the flocculating agent and the conditioning agent are in the spiral curved surface structure 19 of the static premixing component 3, so that the sludge in the conditioning tank 4 can be fully mixed with the liquid flocculating agent and the solid conditioning agent in the static premixing component 3 through the circulation of the first channel, and then the chemical agents are stirred in a layered manner by combining the stirrer 9 in the conditioning tank 4, thereby accelerating the dissolution and mixing of the chemical agents, and achieving the purposes of saving conditioning time and saving agent cost.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An apparatus for conditioning sludge, comprising: a conditioning tank (4), a medicine dissolving component (1), a spiral pusher (12) and a control component;
the top end of the conditioning tank (4) is provided with a static premixing component (3), the static premixing component (3) is provided with at least three inlets, a first inlet (16) is a sludge inlet, a second inlet (17) is a flocculating agent inlet and is communicated with the medicine dissolving component (1), a third inlet (18) is a conditioner inlet and is communicated with the spiral material pusher (12);
a first channel is formed between the outlet of the conditioning tank (4) and the first inlet (16), a circulating pump (11) is arranged on the first channel, a second channel is formed between the medicine dissolving component (1) and the third inlet (18), and a medicine adding pump (6) and a medicine adding flow meter (7) are arranged on the second channel;
the top end of the conditioning tank (4) is also provided with a stirrer (9) and a liquid level sensor (8), and the control component is in communication connection with the medicine dissolving component (1), the spiral pusher (12), the circulating pump (11), the medicine adding pump (6), the medicine adding flowmeter (7), the stirrer (9) and the liquid level sensor (8) and is used for controlling the addition of a flocculating agent, the addition of a conditioning agent and the circulation and stirring of sludge.
2. The device according to claim 1, characterized in that the static premixing component (3) is internally provided with a helical curved structure (19), the first inlet (16) and the third inlet (18) are both arranged at the top end of the static premixing component (3), the sludge enters the top inlet of the helical curved structure (19) from the first inlet (16), the conditioner enters the top outlet of the helical curved structure (19) through the third inlet (18), the second inlet (17) is arranged on the side wall of the static premixing component (3), and the flocculant enters the middle layer of the helical curved structure (19) through the second inlet (17).
3. The device according to claim 2, characterized in that the number of layers of the helical curved structure (19) is 3-4, the angle of inclination of each layer is 45-60 °, the pitch between each layer is 15-20cm and increases from top to bottom.
4. A method for conditioning sludge using the apparatus of any of claims 1 to 3, comprising the steps of:
s1: adding a predetermined amount of sludge to be conditioned into a conditioning tank through a static premixing component, monitoring the liquid level height of the conditioning tank in real time, controlling a stirrer to be started, adjusting stirring parameters of the stirrer, and stirring the sludge;
s2: preparing a flocculating agent in the medicine dissolving component, opening a first channel and a second channel, mixing the flocculating agent and sludge returned by the first channel in a static premixing component to form a first mixture, feeding the first mixture into a conditioning tank, and closing the second channel after the flocculating agent reaches a preset amount;
s3: starting the spiral pusher, pushing the conditioner into the static premixing component, mixing the conditioner with the sludge returned through the first channel in the static premixing component to form a second mixture, and feeding the second mixture into a conditioning tank;
s4: after the conditioner is added to a preset amount, the spiral pusher and the first channel are closed, the stirring parameters of the stirrer are adjusted, the sludge in the conditioning tank is conditioned, and after the conditioning of the sludge is finished, a sludge outlet valve of the conditioning tank is opened, and the conditioned sludge is discharged into the dehydrator.
5. The method for conditioning sludge as claimed in claim 4, wherein a predetermined amount of sludge to be conditioned is added to the conditioning tank via a static pre-mixing assembly, comprising in particular:
s11: opening a first inlet, and injecting sludge to be conditioned into the static premixing component through the first inlet;
s12: and collecting data of a flow meter at the sludge inlet in real time, and stopping adding after a preset amount is reached.
6. The method for conditioning sludge of claim 5, wherein monitoring the liquid level of the conditioning tank in real time, controlling the agitator on, and adjusting agitation parameters of the agitator comprise:
s13: when the liquid level reaches a set height, starting a stirrer to stir the added sludge, wherein the rotating speed of the stirrer is 25-30 rpm/min;
s14: after the feeding is stopped, the rotating speed of the stirrer is adjusted to 35-45 rpm/min.
7. The method for conditioning sludge according to claim 4, wherein the step S2, in particular comprises:
s21: two flocculants, namely a polyaluminium chloride solution and a polyacrylamide solution are arranged in the medicine dissolving component, wherein the concentration of the polyaluminium chloride solution is 20-25% kg/m 3 The concentration of the polyacrylamide solution is 0.2 to 0.3 percent kg/m 3 Stirring for 25-35min after preparation;
s22: after the conditioned sludge begins to be added, a first channel and a second channel are opened, data of a dosing flowmeter are collected in real time, two kinds of flocculating agents pass through the second channel and are mixed with the sludge returned through the first channel in a static premixing component to form a first mixture, and the first mixture enters a conditioning tank;
s23: and controlling the addition amount of the flocculating agent, and closing the second channel after the ratio of the amount of the polyaluminium chloride and the polyacrylamide to the amount of the oven-dried sludge of the sludge to be conditioned reaches 2-5% and 0.1-0.3% respectively.
8. The method for conditioning sludge as claimed in claim 7, wherein the flow velocity of the sludge in the first channel is 70-90m 3 H, the flow rate of the polyaluminium chloride solution in the second passage is 3-4m 3 The flow rate of the polyacrylamide solution is 6-7m 3 /h。
9. Method for conditioning sludge according to claim 4, characterized in that the amount of conditioning agent dosed is 12-16% in relation to the amount of absolutely dry sludge of the sludge to be conditioned.
10. The method for conditioning sludge according to claim 4, wherein the step S4, in particular comprises:
s41: after the spiral pusher and the first channel are closed, the rotating speed of the stirrer is adjusted to be 25-30 rpm/min;
s42: after stirring for 20-25min, opening a sludge outlet valve and a sludge outlet pump of the conditioning tank, and discharging sludge into a dehydrator;
s43: and after the sludge in the conditioning tank is completely discharged into the dehydrator, closing the stirrer and stopping stirring.
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| CN202210594859.4A CN114940575B (en) | 2022-05-27 | 2022-05-27 | Device and method for conditioning sludge |
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| CN202210594859.4A CN114940575B (en) | 2022-05-27 | 2022-05-27 | Device and method for conditioning sludge |
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|---|---|---|---|---|
| JP2003117599A (en) * | 2001-10-11 | 2003-04-22 | Toray Eng Co Ltd | Sludge treating equipment |
| JP2008307535A (en) * | 2008-06-19 | 2008-12-25 | Okumura Corp | Apparatus for dewatering sludge |
| CN102452775A (en) * | 2010-11-01 | 2012-05-16 | 宇星科技发展(深圳)有限公司 | Novel sludge conditioning device and conditioning method |
| CN202490577U (en) * | 2012-02-28 | 2012-10-17 | 昆山大世界油墨涂料有限公司 | Static mixer |
| WO2014021228A1 (en) * | 2012-07-30 | 2014-02-06 | 水ｉｎｇ株式会社 | Sludge treatment method and treatment device |
| CN106746480A (en) * | 2016-12-28 | 2017-05-31 | 江苏道科环境科技有限公司 | A kind of sludge dewatering conditioning system and method |
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2022
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003117599A (en) * | 2001-10-11 | 2003-04-22 | Toray Eng Co Ltd | Sludge treating equipment |
| JP2008307535A (en) * | 2008-06-19 | 2008-12-25 | Okumura Corp | Apparatus for dewatering sludge |
| CN102452775A (en) * | 2010-11-01 | 2012-05-16 | 宇星科技发展(深圳)有限公司 | Novel sludge conditioning device and conditioning method |
| CN202490577U (en) * | 2012-02-28 | 2012-10-17 | 昆山大世界油墨涂料有限公司 | Static mixer |
| WO2014021228A1 (en) * | 2012-07-30 | 2014-02-06 | 水ｉｎｇ株式会社 | Sludge treatment method and treatment device |
| CN106746480A (en) * | 2016-12-28 | 2017-05-31 | 江苏道科环境科技有限公司 | A kind of sludge dewatering conditioning system and method |
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