CN210340672U - Sludge dewatering pretreatment device - Google Patents
Sludge dewatering pretreatment device Download PDFInfo
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- CN210340672U CN210340672U CN201921001060.XU CN201921001060U CN210340672U CN 210340672 U CN210340672 U CN 210340672U CN 201921001060 U CN201921001060 U CN 201921001060U CN 210340672 U CN210340672 U CN 210340672U
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Abstract
The utility model discloses a sludge dewatering pretreatment device, which comprises a mechanical crushing pretreatment device, a sludge delivery pump, a first mud-drug mixer, a first serpentine pipe, an ultrasonic reactor, a second mud-drug mixer, a second serpentine pipe, a stirring device and a concentration filter press; the mechanical crushing pretreatment equipment is used for crushing large impurities in the sludge, and an outlet of the mechanical crushing pretreatment equipment is connected with the sludge delivery pump; the first mud-drug mixer is respectively connected with the sludge delivery pump and the first serpentine pipe and is used for mixing a sludge conditioning agent with sludge; the ultrasonic reactor is arranged on the outer wall of the pipeline between the first serpentine pipe and the second slurry-medicine mixer; the second mud-medicine mixer is connected with the second serpentine pipe and is used for mixing a flocculating agent with the sludge; and the inlet of the stirring device is connected with the second serpentine pipe, and the outlet of the stirring device is connected with the concentration filter press. The utility model has the advantages of short sludge conditioning time, thorough sludge modification, high sludge dewatering efficiency and the like.
Description
Technical Field
The utility model belongs to the technical field of sludge treatment, especially, relate to a sludge dewatering pretreatment device.
Background
The national sludge yield is large, but the harmless disposal rate is low. According to the Ministry of construction, at the end of 2017, the national sewage treatment capacity reaches 1.82 billion cubic meters per day, the sludge generation capacity is calculated to be 80% of water content, the total amount is about 4328 million tons per year, and with the increase of sewage treatment capacity and the standard improvement of sewage plants, 5075 million tons per year (80% of water content) is expected to be reached in 2020. According to statistics of relevant departments, the harmless treatment rate of domestic sludge is less than 35%, and the difference from the thirteen-five planning target to 60% -90% is large.
The existing sludge disposal routes comprise land utilization, landfill, building material utilization, incineration and the like. The land utilization is not smooth in path due to the excessive heavy metal; the landfill is a temporary transitional technical route, which is combined with front-end deep dehydration to form the most application cases at the present stage, but the addition amount of the medicament is large, the sludge increment is obvious, and secondary pollution exists; the building material utilization is that because the water content of the sludge is higher, the doping amount is small, the sludge corrosivity is strong due to the fact that a large amount of agents are added in the front end dehydration, and at present, many collaborative cement projects are stopped; incineration is the most thorough method for solving the sludge problem at present and is the most mainstream technology for international sludge treatment, but the sludge in China has low heat value, high water content and high sediment content, the traditional drying equipment is greatly abraded, and the operation and maintenance are complex, so that the drying cost is high. Sludge treatment is determined by sludge treatment, all front-end sludge treatment unit technologies serve rear-end sludge treatment, dehydration and drying are common key technologies of sludge treatment, and how to realize dehydration and drying of sludge with low energy and high efficiency is a necessary way for joining sludge treatment and treatment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome not enough and the defect mentioned in the above background art, provide a sludge dewatering pretreatment device that the sludge conditioning time is short, the modification is thorough, dehydration efficiency is high.
In order to solve the technical problem, the utility model provides a technical scheme does:
a sludge dewatering pretreatment device comprises mechanical crushing pretreatment equipment, a sludge delivery pump, a first mud-drug mixer, a first serpentine pipe, an ultrasonic reactor, a second mud-drug mixer, a second serpentine pipe, stirring equipment and a concentration filter press;
the mechanical crushing pretreatment equipment is used for crushing large impurities in the sludge, and an outlet of the mechanical crushing pretreatment equipment is connected with the sludge delivery pump;
the first mud-medicine mixer is respectively connected with the sludge delivery pump and the first serpentine pipe and is used for mixing a sludge conditioning agent with sludge;
the ultrasonic reactor is arranged on the outer wall of the pipeline between the first serpentine pipe and the second slurry-medicine mixer;
the second mud medicine mixer is connected with the second serpentine pipe and is used for mixing a flocculating agent with the sludge;
and the inlet of the stirring device is connected with the second serpentine pipe, and the outlet of the stirring device is connected with the concentration filter press.
Further, the sludge delivery pump is a sludge screw pump, the stirring equipment is horizontal stirring equipment, and the concentration filter press is a heavy high-pressure belt type concentration filter press all-in-one machine.
Further, the device adopts a container type.
The method for sludge dewatering pretreatment by using the sludge dewatering pretreatment device comprises the following steps:
s1, crushing large impurities in the sludge through mechanical crushing pretreatment equipment, and conveying the large impurities to a first slurry-medicine mixer through a sludge conveying pump;
s2, adding a sludge conditioning agent into the first sludge-drug mixer to mix the sludge conditioning agent with the sludge;
s3, the sludge mixed with the sludge conditioning agent enters the ultrasonic reactor through the first serpentine pipe, and the sludge is subjected to cell lysis and wall breaking through sonochemical reaction;
s4, enabling the sludge subjected to the sonochemical reaction to enter a second mud-medicine mixer, and adding a flocculating agent into the second mud-medicine mixer;
and S5, feeding the flocculated sludge into a stirring device through a second coil pipe, stirring, and then flowing into a concentration filter press for concentration treatment.
Further, the sludge conditioning agent in the S2 adopts one or any combination of composite aluminum iron salt, hydrogen peroxide, ferrous sulfate, PAC and PFS.
Furthermore, the ferrous sulfate is replaced by pickling wastewater generated in the metal processing industry, and the addition amount of the ferrous sulfate is 5-20% of the mass of the oven-dried sludge.
Further, the composite aluminum ferric salt is one or any combination of polymeric aluminum ferric sulfate, polymeric aluminum ferric silicate and polymeric aluminum ferric chloride, and is added in a solution form, the effective content is 30-40%, and the addition amount is 2-8% of the mass of the oven-dried sludge.
Furthermore, the ultrasonic frequency of the ultrasonic reactor is set to be 20-100kHz in S3, the energy density is 0.207-0.265W/mL, and the ultrasonic time is 2-35S.
Further, in S5, the stirring speed of the stirring equipment is set to be 20-50 r/min.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses the surplus sludge or the primary sludge that is 99% with the moisture content mixes with chemical agent and takes care of the modification, adopt the ultrasonic wave to assist the modification taking care of the in-process, two kinds of modes synergism, mud medicine mixes and strengthens the chemical reaction with higher speed, make the extracellular polymer of mud dissolve release binding water, cell wall breaking release inside water, mud reaches the easy dehydration purpose, the mud after will modifying again is carried and is got into the concentrated pressure filter of high-pressure belt, carry out mechanical dehydration mud moisture content and fall to below 60%, satisfy present national sludge treatment standard. The method has the advantages of short sludge conditioning time, thorough sludge modification, high sludge dewatering efficiency and the like.
Compared with the traditional sludge pretreatment mode, the traditional mode is to concentrate, break the wall and flocculate, the energy consumption of concentration equipment is high, the occupied area is large, secondary flocculation is needed before the sludge enters dehydration equipment, and the cost of the agent is high; the utility model discloses an adopt earlier broken wall flocculation concentration again, can save the secondary concentration cost to can reach the sludge pretreatment effect equally, reduce sewage factory mud operation expense.
The utility model discloses whole equipment adopts container formula, conditions sludge modification, concentration, squeezes the dehydration and in integrated to a container, replaces original belt machine, centrifuge, the spiral shell machine of handling to moisture content 80% and handles the sheet frame hydroextractor to moisture content 60-70%. Has the advantages of simple structure, good treatment effect, easy operation, small occupied area, integrated, continuous and automatic sludge dewatering operation and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a sludge dewatering pretreatment device of the embodiment of the utility model.
Wherein, 1, mechanical crushing pretreatment equipment; 2. a sludge screw pump; 3. a first slurry mixer; 4. a first serpentine tube; 5. an ultrasonic reactor; 6. a second slurry mixer; 7. a second serpentine tube; 8. horizontal stirring equipment; 9. high-pressure belt type concentration filter press.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully and specifically with reference to the accompanying drawings and preferred embodiments, but the scope of the present invention is not limited to the following specific embodiments.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by an existing method.
The sludge dewatering pretreatment device of one embodiment of the present invention, as shown in fig. 1, includes a mechanical crushing pretreatment apparatus 1, a sludge transfer pump (for example, a sludge screw pump 2), a first slurry mixer 3, a first coil pipe 4, an ultrasonic reactor 5, a second slurry mixer 6, a second coil pipe 7, an agitator (for example, a horizontal agitator 8), and a concentration filter press (for example, a high-pressure belt type concentration filter press 9). The outlet of the mechanical crushing pretreatment equipment 1 is connected with a sludge delivery pump; the first slurry-medicine mixer 3 is respectively connected with a sludge delivery pump and a first serpentine pipe 4; the ultrasonic reactor 5 is arranged on the outer wall of the pipeline between the first serpentine pipe 4 and the second slurry-medicine mixer 6; the second slurry mixer 6 is connected with a second serpentine pipe 7; the inlet of the stirring device is connected with the second serpentine pipe 7, and the outlet is connected with the concentration filter press.
The device adopts a container type, and integrates the sludge conditioning modification, concentration, squeezing and dehydration into a container.
The utility model discloses sludge conditioning modification adopts chemical agent/ultrasonic wave in coordination with the cell lysis broken wall, improves sludge dewatering performance. The method comprises the following specific steps: firstly, crushing large impurities through mechanical crushing pretreatment equipment 1 at the front end of a sludge screw pump 2 to prevent the large impurities from blocking the sludge screw pump 2 and a pipeline, and then adding a sludge conditioning agent into a first mud-drug mixer 3 at the rear end of the sludge screw pump 2; then enters an ultrasonic reactor 5 through a first serpentine pipe (increasing residence time, fully reacting, fully mixing and reducing the addition of medicament), generates a sonochemical reaction, accelerates the chemical reaction speed, and promotes sludge to thoroughly lyse and break walls; then the sludge enters a second mud-medicine mixer 6 to be added with a flocculating agent, the sludge forms cotton flocculent floc and enters a horizontal stirring device 8 through a second serpentine pipe 7, and finally the sludge flows into a high-pressure belt type concentration filter press 9.
The sludge conditioning agent adopts one or more of composite aluminum iron salt (liquid), hydrogen peroxide, ferrous sulfate, PAC and PFS. The composite aluminum ferric salt (liquid) is one of polymeric aluminum ferric silicate salt (PSAF), polymeric aluminum ferric chloride salt (PAFC) and polymeric aluminum ferric sulfate, the effective content is 30-40% (w/w), and the addition amount is 2-8% (w/w) of the absolute dry sludge. The effective content of the hydrogen peroxide is 25-30%, and the addition amount of the hydrogen peroxide is 5-10% (w/w) of the absolute dry sludge. The effective content of the ferrous sulfate is 98-99%, the drying type sludge drying sludge. PAC with effective content of 25-30%, solid or liquid, and the addition amount is 3-8% (w/w) of oven dry sludge. PFS with effective content of 11-20% and solid or liquid in the amount of 3-8% (w/w) of oven dried sludge.
The synergistic effect of the polymeric aluminum ferric sulfate and the ultrasonic wave is the best, experiments prove that the addition amount of the polymeric aluminum ferric sulfate is 3 percent, the ultrasonic specific energy is 0.04kwh/kgDS, the addition amount of the PAM emulsion flocculating agent is four thousandth, and the water content of the dewatered mud cake is 60 percent through high-pressure belt type concentration and filter pressing. For comparison, the polymeric aluminum ferric sulfate is matched with PAM emulsion, ultrasonic wave is not added for synergism, the addition amount of the polymeric aluminum ferric sulfate is 8 percent, the addition amount of the PAM emulsion is seven thousandth, and the water content of the mud cake is up to 72 percent through high-pressure belt type concentration and filter pressing.
The ferrous sulfate solution can be replaced by pickling waste water generated in the metal processing industry such as steel (the pickling waste water is used for removing metal surface oxides and is generated when acid such as sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid, phosphoric acid and the like is used for pickling treatment). The pickling waste water is used as waste water, but is added into the sludge to be used as an inorganic coagulant or reducing agent, and is matched with an organic flocculant or oxidizing agent, so that the dewatering performance of the sludge can be well improved, the pickling waste liquid is well solved, and the medicament cost can be saved for sludge conditioning. According to the concentration of the acid pickling wastewater, the addition amount of the acid pickling wastewater is 5-20% (w/w) of the absolute dry sludge.
The ultrasonic reactor 5 is attached to the outer wall of the sludge pipeline, the ultrasonic frequency is 20-100kHz, the sound intensity and the specific energy consumption are high, the cell lysis and wall breaking are realized by adopting the combination of low-energy-density ultrasonic waves and chemical agents, the energy consumption required by cell lysis can be effectively reduced, the energy efficiency is improved, and the service life of an ultrasonic device is prolonged.
The ultrasonic wave can improve the mass transfer efficiency of the sludge and the chemical agent, so that the sludge and the chemical agent penetrate into the sludge floc to reach the surface of bacterial cells and dissolve the cells, thereby effectively shortening the required reaction time, reducing the drug consumption and improving the lysis efficiency.
Experiments show that the ultrasonic wave with the energy density of 0.207-0.265W/mL is combined with the treatment of chemical agents to be used for the lysis of the residual sludge, the specific energy is 0.02-0.16kwh/kgDS, the pH value is 6.0, the ultrasonic time is 2-35 s, and the lysis rate of the sludge is improved by 15-30% compared with that of the sludge which is singly used by the chemical agents.
The flocculant is PAM emulsion (stock solution) or PAM powder. The PAM emulsion has a solid content of 35-45%, a preparation concentration of 0.3-0.6% wt, and an addition amount of 0.1-0.6% (w/w) of the oven dry sludge.
The mud-medicine hybrid system adopts the multidirectional continuous mud-medicine blender of stranded, through on-line monitoring equipment monitoring sludge concentration, adjusts mud-medicine mixture proportion in real time.
The horizontal stirring device 8 has the stirring speed of 20-50r/min, and plays a role in buffering and uniformly mixing mud and medicine.
The high-pressure belt type concentration filter press 9 adopts a heavy high-pressure belt type concentration filter press all-in-one machine, can reduce the sludge with the water content of about 99 percent to below 60 percent, adopts hydraulic pressure for tensioning filter cloth, has the squeezing pressure of 40kg, continuously operates equipment and occupies small area.
The embodiment of the utility model provides a have following effect:
1. the treatment effect is obvious, the sludge reduction amount reaches 97% (the water content of the sludge is reduced to below 60% from 99% by the method and the device);
2. the sludge pretreatment adopts the combination of chemistry and physics, and the lysis and wall breaking of the sludge are more thorough;
3. the cost is low, and compared with the same type of plate-and-frame dehydrator, the equipment operation cost is reduced by 50%;
4. the occupied area is small, and compared with a plate frame dehydrator, the occupied area is saved by 2/3;
5. the civil engineering cost is saved, the construction period is short, equipment assembly is completed in a factory, and the modular design is realized;
6. the sludge conditioning and modifying continuous reaction does not need to be provided with a reaction container, so that the occupied space is saved;
7. the whole equipment continuously and automatically operates for 24 hours and is unattended.
The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting the invention in any way. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. A sludge dewatering pretreatment device is characterized by comprising mechanical crushing pretreatment equipment, a sludge delivery pump, a first slurry-medicine mixer, a first serpentine pipe, an ultrasonic reactor, a second slurry-medicine mixer, a second serpentine pipe, stirring equipment and a concentration filter press;
the mechanical crushing pretreatment equipment is used for crushing large impurities in the sludge, and an outlet of the mechanical crushing pretreatment equipment is connected with the sludge delivery pump;
the first mud-medicine mixer is respectively connected with the sludge delivery pump and the first serpentine pipe and is used for mixing a sludge conditioning agent with sludge;
the ultrasonic reactor is arranged on the outer wall of the pipeline between the first serpentine pipe and the second slurry-medicine mixer;
the second mud medicine mixer is connected with the second serpentine pipe and is used for mixing a flocculating agent with the sludge;
and the inlet of the stirring device is connected with the second serpentine pipe, and the outlet of the stirring device is connected with the concentration filter press.
2. The sludge dewatering pretreatment device of claim 1, wherein the sludge transfer pump is a sludge screw pump.
3. The sludge dewatering pretreatment device of claim 1, wherein the concentration filter press is a heavy high pressure belt concentration filter press all-in-one machine.
4. The sludge dewatering pretreatment device of claim 1, wherein the agitation equipment is horizontal agitation equipment.
5. The sludge dewatering pretreatment device of claim 1, wherein the device is in a container type.
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| CN201921001060.XU CN210340672U (en) | 2019-06-28 | 2019-06-28 | Sludge dewatering pretreatment device |
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| CN201921001060.XU CN210340672U (en) | 2019-06-28 | 2019-06-28 | Sludge dewatering pretreatment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110228935A (en) * | 2019-06-28 | 2019-09-13 | 湖南北控威保特环境科技股份有限公司 | A kind of sludge dewatering pretreatment unit and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110228935A (en) * | 2019-06-28 | 2019-09-13 | 湖南北控威保特环境科技股份有限公司 | A kind of sludge dewatering pretreatment unit and method |
| CN110228935B (en) * | 2019-06-28 | 2024-07-23 | 湖南北控威保特环境科技股份有限公司 | Sludge dewatering pretreatment device and method |
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