CN114940575B - Device and method for conditioning sludge - Google Patents

Device and method for conditioning sludge Download PDF

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Publication number
CN114940575B
CN114940575B CN202210594859.4A CN202210594859A CN114940575B CN 114940575 B CN114940575 B CN 114940575B CN 202210594859 A CN202210594859 A CN 202210594859A CN 114940575 B CN114940575 B CN 114940575B
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sludge
conditioning
channel
inlet
component
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CN114940575A (en
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朱迎春
彭轶
方运川
侯锋
张术宝
韩磊
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SDIC Xinkai Water Environment Investment Co Ltd
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SDIC Xinkai Water Environment Investment Co Ltd
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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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a device and a method for conditioning sludge, comprising 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 mud inlet, a flocculating agent inlet and a conditioning agent inlet; a first channel is formed between the outlet of the conditioning tank and the mud 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 assembly is in communication connection with the medicine dissolving assembly, 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 flocculant and the conditioner can be accurately and intelligently controlled to be added according to different sludge conditioning requirements, so that uniform and sufficient mixing is ensured, high efficiency and high quality of sludge conditioning are realized, and the conditioned sludge meets the standard of sludge deep dehydration treatment.

Description

Device and method for conditioning sludge
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 urban sludge has higher organic matter content, water content and the like, has loose structure, and is always not up to the standard when being directly dehydrated. At present, the sludge is conditioned before deep dehydration treatment, for example, PAM and other flocculating agents are added, so that particles in the sludge are converged into a floc, and the water content is further reduced.
As CN210855782U provides an automatic feeding flocculation conditioning tank comprising a flocculation conditioning assembly, a flocculation conditioning agent supply assembly; the flocculation conditioning assembly is communicated with the flocculation conditioning agent supply assembly; the flocculation conditioning assembly comprises a tank body, a stirring piece is rotationally connected in the tank body and comprises a stirring shaft, a plurality of stirring parts are fixedly connected on the stirring shaft, the stirring shaft is connected with a driving motor, and the top of the tank body is communicated with the flocculation conditioning agent supply assembly through a conveying pipeline. By fully agitating the flocculated conditioning liquid, the flocculation settling period is shortened and the productivity is improved.
However, when the flocculant, the conditioner and the like in the prior art are directly stirred and mixed with the sludge in a single-point feeding mode, the flow state of the sludge is annular flow, the sludge, the flocculant and the conditioner cannot be fully mixed, the conditioning is carried out for a long time, the conditioning efficiency is low, and the conditioned sludge is difficult to meet the requirements of a subsequent efficient deep dehydration process.
Therefore, how to ensure the accurate and full mixing of the sludge, the flocculant and the conditioner so as to realize the high efficiency and high quality of sludge conditioning, and the automatic and accurate control is a problem to be solved by the technicians in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a device and a method for conditioning sludge, which can accurately control the addition of flocculant and conditioner according to different sludge conditioning requirements, and the flocculant, the conditioner and the sludge are mixed in a static premixing component, so that the high efficiency and high quality of a sludge conditioning process are ensured, and the conditioned sludge meets the requirements of a high-efficiency deep dehydration process.
In a first aspect, the invention provides a device for conditioning sludge, characterized in that it comprises: 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 mud inlet, the second inlet is a flocculating agent inlet and is communicated with the medicine dissolving component, and the third inlet is a conditioner inlet and is communicated with the 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 component and the third inlet, and a medicine adding pump and a medicine adding flowmeter 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 assembly is in communication connection with the medicine dissolving assembly, 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, the addition of the conditioning agent and the circulation and stirring of the sludge.
Further, a spiral curved surface structure is arranged in the static premixing component, the first inlet and the third inlet are formed in 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 conditioning agent enters the top layer outlet of the spiral curved surface structure through the third inlet, the second inlet is formed in 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.
Further, the number of layers of the spiral curved surface structure is 3-4, the inclination angle of each layer is 45-60 degrees, the pitch between each layer is 15-20cm, and the layers are sequentially increased from top to bottom.
In a second aspect, the present invention also provides a method for conditioning sludge using the above apparatus, 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 the opening of a stirrer, 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 through the first channel in the static premixing component to form a first mixture, enabling the first mixture to enter a conditioning tank, and closing the second channel after the flocculating agent reaches a preset amount;
s3: starting a spiral pusher, pushing the conditioning agent into the static premixing component, mixing the conditioning agent with sludge returned through the first channel in the static premixing component to form a second mixture, and enabling the second mixture to enter 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, after the sludge conditioning is finished, the sludge outlet valve of the conditioning tank is opened, and the conditioned sludge is discharged to the dehydrator.
Further, adding a predetermined amount of sludge to be conditioned into a conditioning tank through a static premixing component, wherein the method specifically comprises the following steps:
s11: opening a first inlet, and injecting sludge to be conditioned into the static premixing assembly through the first inlet;
s12: and collecting data of the mud inlet flowmeter in real time, and stopping adding after a preset amount is reached.
Further, the liquid level of the conditioning tank is monitored in real time, the opening of the stirrer is controlled, and stirring parameters of the stirrer are adjusted, and the method specifically comprises the following steps:
s13: the liquid level reaches the set height, a stirrer is started to stir the added sludge, and the rotating speed of the stirrer is 25-30rpm/min;
s14: after stopping the addition, the rotational speed of the stirrer was adjusted to 35-45rpm/min.
Further, the step S2 specifically includes:
s21: two flocculating agents, 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 the preparation is completed;
s22: after the conditioned sludge starts to be added, a first channel and a second channel are opened, data of a dosing flowmeter are collected in real time, and two flocculating agents are mixed with the sludge returned from the first channel in a static premixing component through the second channel to form a first mixture, and the first mixture enters a conditioning tank;
s23: and controlling the addition amount of the flocculant, and closing the second channel after the proportion of the amounts of the polyaluminum chloride and the polyacrylamide to the absolute dry sludge amount of the sludge to be conditioned reaches 2% -5% and 0.1% -0.3% respectively.
Further, the flow rate of the sludge in the first channel is 70-90m 3 And/h, the flow rate of the polyaluminum chloride solution in the second channel is 3-4m 3 The flow rate of the polyacrylamide solution is 6-7m 3 /h。
Further, the proportion of the amount of the added conditioner to the amount of the absolute dry sludge of the 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 25-30rpm/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: after the sludge in the conditioning tank is completely discharged into the dehydrator, the stirrer is closed, and stirring is stopped.
The invention provides a device and a method for conditioning sludge, which at least comprise the following beneficial effects:
(1) The sludge, the added flocculant and the conditioner are respectively blended, and the addition amount is monitored and controlled, so that the accurate automatic control of mixing with the sludge is realized.
(2) The static coagulation component realizes the respective mixing of the circulated sludge, the flocculant and the conditioner, ensures the full and uniform mixing, and is combined with the layered stirring of the stirrer in the conditioning tank to accelerate the dissolution and mixing of the flocculant and the conditioner, thereby improving the efficiency of sludge conditioning and saving the cost of the flocculant 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 full dissolution and mixing of the sludge, the flocculating agent and the conditioning agent can be ensured.
(4) The control component accurately controls each step from adding of sludge, flocculating agent and conditioning agent to mixing, circulation, stirring and the like, and the intelligent operation of the whole process flow of sludge conditioning is realized.
Drawings
FIG. 1 is a schematic diagram of a device for conditioning sludge according to the present invention;
FIG. 2 is a flow chart of a method for conditioning sludge provided by the invention;
FIG. 3 is a partial cross-sectional view of a static premix assembly according to the present invention.
Reference numerals illustrate: 1. a drug dissolution component; 2. a mud inlet flowmeter; 3. a static premix assembly; 4. a conditioning tank; 5. a dosing valve; 6. a dosing pump; 7. a dosing flowmeter; 8. a liquid level sensor; 9. a stirrer; 10. a circulation valve; 11. a circulation pump; 12. a spiral pusher; 13. a check valve; 14. a mud outlet valve; 15. a mud outlet pump; 16. a first inlet; 17. a second inlet; 18. a third inlet; 19. a spiral curved surface structure.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and 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 mud inlet, a second inlet 17 is a flocculant inlet and is communicated with the medicine dissolving component 1, a third inlet 18 is a conditioner inlet and is communicated with the spiral pusher 12. In the preferred scheme, the front end of the mud inlet is provided with a mud inlet flowmeter 2, and the static premixing component 3 is close to the edge position of the top end of the conditioning tank 4.
The inside spiral curved surface structure 19 that is equipped with of static premix subassembly 3, first entry 16 and third entry 18 all set up on the top of static premix subassembly 3, and mud gets into spiral curved surface structure 19's top layer import by first entry 16, and the top layer export of spiral curved surface structure 19 is got into to the conditioner through third entry 18, and the second entry 17 sets up at static premix subassembly 3's lateral wall, and the flocculating agent gets into spiral curved surface structure 19's intermediate level through second entry 17. The first inlet 16, the second inlet 17 and the third inlet 18 may be realized by flanged connections. The spiral curved surface 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 adding pump 6 and a medicine adding flowmeter 7 are arranged on the second channel. The first channel is also provided with a circulation valve 10 and a check valve 13 to ensure that sludge continuously returns from the outlet of the conditioning tank 4 to the inlet of the conditioning tank 4 along the first channel.
The flocculant and the conditioner are mixed with the circulated and returned sludge in the static premixing component 3 before entering the conditioning tank 4, the sludge, the flocculant and the conditioner are in a relatively static relation in the mixing process, and the sludge in the upper and lower parts of the conditioning tank 4 can be mixed with the flocculant and the conditioner, so that the mixing is more sufficient compared with the mixing in the stirring environment in the conditioning tank 4.
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 pitch between each layer is 15-20cm, and the layers are sequentially increased from top to bottom.
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 is large when the sludge returns to the sludge inlet from the conditioning tank 4 through the first channel, the operation effect of the whole device is affected, the sludge inlet directly impacts the curved surface structure, and the structure is easy to damage. The angle of the curved surface is too large, the flow velocity of the sludge is fast, the mixture of the sludge, the flocculating agent and the conditioner is insufficient, and the overall conditioning effect of the sludge is affected.
The top end 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 finished products made of stainless steel materials, the stirrer 9 is arranged on the tank cover of the conditioning tank 4, and the supporting beam of the static premixing component 3 is also arranged on the tank cover of the conditioning tank 4.
The stirrer 9 comprises a magnetic motor, a stirring rod and paddles, wherein the stirring rod is provided with an upper group of paddles, a middle group of paddles and a lower group of paddles at intervals.
The adopted spiral curved surface structure 19 adopted in the static premixing component 3 can realize the full mixing of the sludge in the conditioning tank 4, the liquid flocculant and the solid conditioner in the static premixing component 3 through the circulation of the first channel, and the layered stirring of the stirrer 9 in the conditioning tank 4 is combined, so that the dissolution and the mixing of the chemical agents are accelerated, and the conditioning time and the agent cost are saved.
The outlet of the conditioning tank 4 also comprises a discharge channel, a mud outlet valve 14 and a mud outlet pump 15 are arranged on the discharge channel, and in the sludge conditioning process, the mud outlet valve 14 and the mud outlet pump 15 are in a closed state. After the sludge conditioning is finished, a sludge outlet valve 14 and a sludge outlet pump 15 are opened, and the sludge is discharged into a dehydrator with a rear end connected.
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 flocculant, the addition of conditioner and the circulation and stirring of sludge.
The control assembly adopts PLC linkage control and is in communication connection with the mud inlet flowmeter 2, the dosing valve 5, the dosing pump 6, the dosing flowmeter 7, the spiral 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 component stores preset data of sludge to be conditioned, flocculating agent and conditioner, after sludge conditioning is started, flow data of all flow meters in the sludge conditioning process are collected, all steps in the sludge conditioning process are monitored, the opening of the pump and the valve are controlled, the operation parameters are regulated, and finally the sludge conditioning process is completed.
Examples:
as shown in fig. 2, the apparatus for conditioning sludge is used for conditioning sludge, 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 through the first channel in the static premixing component 3 to form a first mixture, enabling the first mixture to enter a conditioning tank 4, and closing the second channel after the flocculating agent reaches a preset amount;
s3: starting a spiral pusher 12, pushing the conditioning agent into the static premixing component 3, and mixing the conditioning agent 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;
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, after the sludge conditioning is finished, the sludge outlet valve 14 of the conditioning tank 4 is opened, and the conditioned sludge is discharged into the dehydrator.
The sludge adding process specifically comprises the following steps:
the first inlet is opened, and sludge to be conditioned is injected into the static premixing component 3 through the first inlet. The first inlet is a mud inlet, the mud inlet is arranged at the top end of the static coagulation assembly 3, the mud inlet is close to the top layer inlet of the spiral curved surface structure 19, and the mud starts from the top layer inlet of the spiral curved surface structure 19, flows into the conditioning tank 4 from top to bottom along the multi-layer spiral curved surface structure 19.
And collecting data of the mud inlet flowmeter 2 in real time, and stopping adding after a preset amount is reached.
In the process of entering the sludge, the speed of 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 is ensured to uniformly and smoothly enter the conditioning tank 4;
the liquid level reaches the set height, the set height can be adjusted according to the condition of the sludge to be conditioned, the liquid level sensor 8 monitors that the sludge reaches the position of 1/3 or 1/2 of the height of the conditioning tank 4, the stirrer 9 is started, the added sludge is stirred, the rotating speed of the stirrer 9 is 25-30rpm/min, the sludge reaches a preset amount, and after the adding is stopped, the rotating speed of the stirrer 9 is adjusted to 35-45rpm/min.
Through step S1, the sludge to be conditioned is added into the conditioning tank 4 according to a preset amount, the stirrer 9 is started, the speed of the stirrer 9 is regulated according to the addition amount of the sludge, the conditioning efficiency is improved, and the preparation is made for the subsequent mixing with the flocculant and the conditioner.
Before sludge conditioning, two flocculating agents are required to be configured in the medicine dissolving component 1 in advance, the two flocculating agents can be stored in different units of the medicine dissolving component 1, and the two flocculating agents are respectively a polyaluminium chloride solution and a 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 After the preparation is completed, stirring the units for storing the flocculant for 25-35min to ensure the sufficient dissolution of the solution.
And after the conditioned sludge starts to be added, opening the first channel and the second channel. The circulating flow from the conditioning tank 4 to the mud inlet is realized through the first channel, meanwhile, two flocculating agents also flow to the conditioning tank 4 through the second channel, and data of the dosing flowmeter 7 are collected in real time. The flocculant and the sludge returned through the first channel are mixed in the static premix assembly 3 to form a first mixture, which enters the conditioning tank. The flocculant inlet is arranged on the side wall of the static premixing component 3, and the flocculant enters the middle layer of the spiral curve surface structure 19 and can be a second layer or a third layer from top to bottom.
The flow rate of the sludge in the first channel is 70-90m 3 And/h, the flow rate of the polyaluminum chloride solution in the second channel is 3-4m 3 The flow rate of the polyacrylamide solution is 6-7m 3 And/h. The circulating pump 11 in the first channel is a variable frequency circulating pump, and the flow velocity in the sludge is controlled to be 70-90m 3 The flow rate of the polyaluminum chloride solution and the polyacrylamide solution can be adjusted by a dosing pump 6 in the second channel and respectively controlled at 3-4m 3 /h and 6-7m 3 /h。
The addition amount of the flocculant is controlled by collecting data of the dosing flowmeter 7, and the second channel is closed after the proportion of the amount of polyaluminium chloride to the absolute dry sludge of the sludge to be conditioned reaches 2% -5% and the proportion of the amount of polyacrylamide to the absolute dry sludge of the sludge to be conditioned reaches 0.1% -0.3%.
Sludge flows through the first channel and enters the sludge inlet of the static premixing component 3, the sludge starts to flow gradually along the spiral curved surface structure 19 from the top layer inlet of the spiral curved surface structure 19, and 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 passage, and is circulated and mixed as above. The layered stirring of the stirrer 9 in the conditioning tank 4 is matched, so that the dissolution and mixing of the flocculant and the sludge are accelerated, the sludge conditioning efficiency is improved, and the effects of saving conditioning time and saving medicament cost are achieved.
The spiral pusher 12 is started, the conditioner is pushed into the static premixing component 3 and is mixed with the sludge returned through the first channel in the static premixing component 3 to form a second mixture, the second mixture enters the conditioning tank 4, and the proportion of the added conditioner to the absolute dry sludge of the sludge to be conditioned is 12-16%.
The inlet of the conditioning agent is arranged at the top end of the static premixing component 3 and is close to the top layer outlet of the spiral curved surface structure 19, after the sludge enters the spiral curved surface structure 19, the sludge flows on the top layer curved surface of the spiral curved surface structure 19 in a flat way, flows to the outlet to be mixed with the conditioning agent, and can be fully rolled and impacted when flowing through the lower layers of spiral curved surface structures 19, so that the aim of uniform mixing is fulfilled. The mixture enters a stirrer 9 in a conditioning tank 4 for layered stirring, so that the dissolution and mixing of the conditioner and the sludge are accelerated, and the conditioning time and the conditioning cost are saved.
The conditioner is solid matter, cement, polyaluminium chloride and polyacrylamide are used as the solid matter, and the absolute dry sludge is calculated according to the preset amount of sludge to be conditioned and the measured water content to obtain the weight of sludge without water.
After the addition of the flocculant and the conditioner is completed, closing the spiral pusher 12 and the first channel, mixing the flocculant and the conditioner-mixed sludge, starting conditioning in the stirrer 9, and adjusting the rotating speed of the stirrer 9 to 25-30rpm/min; after stirring for 20-25min, reaching the standard of deep dehydration treatment, opening a mud outlet valve 14 and a mud outlet pump 15 of the conditioning tank 4, and discharging the mud into a dehydrator; after the sludge in the conditioning tank 4 is completely discharged into the dehydrator, the stirrer 9 is turned off, and stirring is stopped.
Comparative example 1:
on an example basis, the amount of flocculant and conditioner entering was adjusted.
The proportion of the polyaluminum chloride to the absolute dry sludge of the sludge to be conditioned is 7% -10%, and the proportion of the polyacrylamide to the absolute dry sludge of the sludge to be conditioned is 0.4% -0.5%.
After the addition of the flocculant and the conditioner is completed, closing the spiral pusher 12 and the first channel, mixing the flocculant and the conditioner-mixed sludge, starting conditioning in the stirrer 9, and adjusting the rotating speed of the stirrer 9 to 25-30rpm/min; after stirring for 20-25min, the standard of deep dehydration treatment can be achieved.
The ratio of the amount of polyaluminum chloride to the absolute dry sludge of the sludge to be conditioned is 1%, and the ratio of the amount of polyacrylamide to the absolute dry sludge of the sludge to be conditioned is 0.07%.
After the addition of the flocculant and the conditioner is completed, closing the spiral pusher 12 and the first channel, mixing the flocculant and the conditioner-mixed sludge, starting conditioning in the stirrer 9, and adjusting the rotating speed of the stirrer 9 to 25-30rpm/min; after stirring for 1h, the sludge still did not meet the criteria for deep dewatering.
Comparative example 2:
on the basis of the embodiment, the premixing step of sludge, flocculant and conditioner in the static premixing component 3 and the circulating 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 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 sludge in the conditioning tank 4, and closing the second channel after the flocculating agent reaches a preset amount;
s3: opening the spiral pusher 12 to push the conditioning agent 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, after the sludge conditioning is finished, the sludge outlet valve 14 of the conditioning tank 4 is opened, and the conditioned sludge is discharged to the dehydrator.
Wherein the stirring parameters of the stirrer 9 are identical to those of the examples.
The type and concentration of flocculant and the type of conditioner were the same as in the examples. Namely, the concentration of the polyaluminum chloride solution is 20 to 25 percent kg/m 3 The concentration of the polyacrylamide solution is 0.2-0.3％kg/m 3 。
The proportion of the polyaluminum chloride to the absolute dry sludge of the sludge to be conditioned is 8 percent, and the proportion of the polyacrylamide to the absolute dry sludge of the sludge to be conditioned is 0.5 percent.
After the addition of the flocculant and the conditioner is completed, closing the spiral pusher 12 and the first channel, mixing the flocculant and the conditioner-mixed sludge, starting conditioning in the stirrer 9, and adjusting the rotating speed of the stirrer 9 to 25-30rpm/min; after stirring for 1h, the standard of deep dehydration treatment is reached, a mud outlet valve 14 and a mud outlet pump 15 of the conditioning tank 4 are opened, and the mud starts 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 stirring is stopped.
Compared with comparative examples 1 and 2, in the embodiment, a proper amount of flocculant is adopted, and the mixing process of the sludge, the flocculant and the conditioner in the sludge conditioning device is combined, namely, the sludge circularly flows from the outlet of the conditioning tank 4 to the sludge inlet, the sludge, the flocculant and the conditioner 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 flocculant and the solid conditioner in the static premixing component 3 through the circulation of the first channel, and the stirrer 9 in the conditioning tank 4 is combined for layered stirring, thereby accelerating the dissolution and mixing of chemical agents, and achieving the purposes of saving conditioning time and saving medicament 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. It is therefore intended that the following claims be interpreted as including the 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 modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (9)

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 mud 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 conditioning agent inlet and is communicated with the spiral pusher (12), a spiral curved surface structure (19) is arranged in the static premixing component (3), the first inlet (16) and the third inlet (18) are both arranged at the top end of the static premixing component (3), mud enters a top layer inlet of the spiral curved surface structure (19) from the first inlet (16), conditioning agent enters a top layer outlet of the spiral curved surface structure (19) from the third inlet (18), the second inlet (17) is arranged on the side wall of the static premixing component (3), and flocculating agent enters a middle layer of the spiral curved surface structure (19) from the second inlet (17);
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 second inlet (17), and a medicine adding pump (6) and a medicine adding flowmeter (7) are arranged on the second channel;
the flocculant and the sludge returned through the first channel are mixed in a static premixing component (3) to form a first mixture, and the first mixture enters a conditioning tank (4); the spiral pusher (12) pushes the conditioning agent into the static premixing component (3) and mixes the conditioning agent with the sludge returned through the first channel in the static premixing component (3) to form a second mixture, and the second mixture enters the conditioning tank (4);
the top end of the conditioning tank (4) is also provided with a stirrer (9) and a liquid level sensor (8), and the control assembly is in communication connection with the medicine dissolving assembly (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 flocculant, the addition of conditioner and the circulation and stirring of sludge; monitoring the liquid level height of the conditioning tank (4) in real time, controlling the opening of the stirrer (9), and adjusting the stirring parameters of the stirrer (9); the flow rate of the sludge in the first channel is controlled by a circulating pump (11), and the flow rate of the flocculating agent in the second channel is adjusted by a dosing pump (6).
2. The device according to claim 1, characterized in that the number of layers of the helically 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 the layers increase in sequence from top to bottom.
3. A method for conditioning sludge using the apparatus of any one of claims 1-2, 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 the opening of a stirrer, 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 through the first channel in the static premixing component to form a first mixture, enabling the first mixture to enter a conditioning tank, and closing the second channel after the flocculating agent reaches a preset amount;
s3: starting a spiral pusher, pushing the conditioning agent into the static premixing component, mixing the conditioning agent with sludge returned through the first channel in the static premixing component to form a second mixture, and enabling the second mixture to enter 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, after the sludge conditioning is finished, the sludge outlet valve of the conditioning tank is opened, and the conditioned sludge is discharged to the dehydrator.
4. A method for conditioning sludge according to claim 3, characterized in that a predetermined quantity of sludge to be conditioned is added to the conditioning tank through a static premixing assembly, comprising in particular:
s11: opening a first inlet, and injecting sludge to be conditioned into the static premixing assembly through the first inlet;
s12: and collecting data of the mud inlet flowmeter in real time, and stopping adding after a preset amount is reached.
5. The method for conditioning sludge as claimed in claim 4, wherein the liquid level of the conditioning tank is monitored in real time, the opening of the agitator is controlled, and the agitation parameters of the agitator are adjusted, and the method specifically comprises:
s13: the liquid level reaches the set height, a stirrer is started to stir the added sludge, and the rotating speed of the stirrer is 25-30rpm/min;
s14: after stopping the addition, the rotational speed of the stirrer was adjusted to 35-45rpm/min.
6. A method for conditioning sludge as claimed in claim 3, characterized in that step S2 comprises in particular:
s21: two flocculating agents, 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 0.2-0.3% kg/m 3 Stirring for 25-35min after the preparation is completed;
s22: after the conditioned sludge starts to be added, a first channel and a second channel are opened, data of a dosing flowmeter are collected in real time, and two flocculating agents are mixed with the sludge returned from the first channel in a static premixing component through the second channel to form a first mixture, and the first mixture enters a conditioning tank;
s23: and controlling the addition amount of the flocculant, and closing the second channel after the proportion of the amounts of the polyaluminum chloride and the polyacrylamide to the absolute dry sludge amount of the sludge to be conditioned reaches 2% -5% and 0.1% -0.3% respectively.
7. The method for conditioning sludge as claimed in claim 6, wherein the flow rate of the sludge in the first passage is 70-90m 3 And/h, the flow rate of the polyaluminum chloride solution in the second channel is 3-4m 3 The flow rate of the polyacrylamide solution is 6-7m 3 /h。
8. A method for conditioning sludge as claimed in claim 3, wherein the amount of conditioning agent added is in the range of 12-16% relative to the amount of oven dry sludge of the sludge to be conditioned.
9. A method for conditioning sludge as claimed in claim 3, characterized in that step S4 comprises in particular:
s41: after the spiral pusher and the first channel are closed, the rotating speed of the stirrer is adjusted to 25-30rpm/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: after the sludge in the conditioning tank is completely discharged into the dehydrator, the stirrer is closed, and stirring is stopped.
CN202210594859.4A 2022-05-27 2022-05-27 Device and method for conditioning sludge Active CN114940575B (en)

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JP3630130B2 (en) * 2001-10-11 2005-03-16 東レエンジニアリング株式会社 Sludge treatment equipment
JP4887335B2 (en) * 2008-06-19 2012-02-29 株式会社奥村組 Sludge dewatering equipment
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
JP5837694B2 (en) * 2012-07-30 2015-12-24 水ｉｎｇ株式会社 Sludge treatment method and treatment apparatus
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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