CN110372175B - Sludge conditioner and sludge drying treatment method - Google Patents
Sludge conditioner and sludge drying treatment method Download PDFInfo
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- CN110372175B CN110372175B CN201910818330.4A CN201910818330A CN110372175B CN 110372175 B CN110372175 B CN 110372175B CN 201910818330 A CN201910818330 A CN 201910818330A CN 110372175 B CN110372175 B CN 110372175B
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
Abstract
The invention discloses a sludge conditioner and a sludge drying treatment method. The sludge conditioner comprises a component A, a component B and a component C; the mass ratio of the component A to the component B to the component C is 1: 0.2-0.5: 0.15 to 0.2; wherein the component A is polymeric ferric chloride or polymeric aluminum chloride, and the component B is polyacrylamide; the component C is cement. The sludge drying treatment method comprises the following steps: s1, diluting the raw sludge to form a sludge solution with uniform quality; s2, fully reacting the sludge solution with the sludge conditioner for 0.5-1.0 h; s3, precipitating the sludge solution; and S4, pressing and dehydrating the sludge to form a sludge cake and discharging the sludge. The invention can reduce the water content of the discharged sludge, further reduce the volume of the sludge, relieve the pressure of a refuse landfill and is environment-friendly.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a sludge conditioner and a sludge drying treatment method.
Background
With the rapid development of social economy, the amount of sewage treated by sewage treatment plants is increasing day by day, and the amount of sludge generated by sewage treatment is also increasing. The sludge generated by sewage plants is complex in composition, contains various microorganisms, organic matters and inorganic matters, and mainly contains organic matters, heavy metals, salts, pathogens and the like which are difficult to degrade. Sludge produced from industrial wastewater mostly contains a large amount of heavy metals.
If the sludge is directly discharged without being treated, the sludge causes great harm to the environment. Because the sludge which is not subjected to stabilization treatment has high organic matter content, is easy to be decomposed, can breed a large amount of germs, parasites and the like, and is easy to cause secondary pollution to the environment. The sludge is washed by rainwater, flows to the surface water body and permeates into the ground to cause pollution. The sludge piled in the open air is easy to generate foul smell and propagate mosquitoes and flies, thus seriously affecting the sanitation of the surrounding environment. In the process of sludge transportation, the sludge is easy to leak along the way to form pollution due to higher water content. The high water content of the sludge reduces the transportation economy and increases the sludge transportation cost and the sludge disposal cost of the refuse landfill.
The existing sludge treatment mode is to directly bury the sludge in a sewage treatment plant, but the mode brings a lot of hazards to a refuse landfill, and the specific method is as follows: shortening the service life of the refuse landfill. The direct landfill of the dewatered sludge can greatly occupy the effective storage capacity of the refuse landfill, and the service life of the refuse landfill is shortened. At present, there is an increasing conflict between increasing amounts of mud and limited landfill capacity. Secondly, the landfill operation is difficult. According to the requirements of the pollution control standard of the household garbage landfill (GB16889-2008), the water content of the sludge of the sewage treatment plant is less than 60 percent after treatment, and the sludge can be subjected to landfill disposal in the household garbage landfill. Landfills are typically covered with a layer of refuse and then rolled to ensure better space utilization. The water content of the dewatered sludge is generally about 80 percent, the high water content and high viscosity of the sludge bring difficulty to the landfill operation, and the landfill process such as flattening, compacting and covering is difficult to carry out. And causing great pollution to the environment. In the sludge landfill process, mechanical equipment cannot perform compaction, covering and other work on the surface of sludge, so that the sludge is basically piled in a landfill in the open air, and the emitted stink causes pollution to the atmosphere. Because the sludge cannot be compacted, the surface of the sludge is very loose, and besides, fly killers cannot perform killing work on the surface of the sludge, the sludge forms a good environment for breeding flies, so that the flies in the landfill propagate in a large quantity. And fourthly, the percolate collecting system is seriously blocked. The high moisture content greatly increased landfill leachate treatment capacity of mud because mud is tiny, often blocks up leachate collection system and drain pipe, has aggravated the bearing load of rubbish dam, brings the difficulty for landfill safety and management, and this kind of phenomenon has aggravated more in the rainy season. The cost of cleaning the collection system is extremely expensive. Bringing about potential safety hazard. The rheological property of the sludge makes the landfill body easy to deform and slide, so that the landfill becomes artificial marshland, and the sludge treatment which brings great potential safety hazard to the landfill becomes a great problem of environmental management.
Therefore, how to reduce the water content of the sludge to solve the above problems is the direction of research by those skilled in the art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a sludge conditioner which solves the problem of cell bound water difficult to remove in sludge through wall breaking and chain breaking, releases water in microorganisms in the sludge and reduces the water content of the sludge.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows:
a sludge conditioner, which comprises a component A, a component B and a component C; the mass ratio of the component A to the component B to the component C is 1: 0.2-0.5: 0.15 to 0.2; wherein the component A is polymeric ferric chloride or polymeric aluminum chloride, and the component B is polyacrylamide; the component C is cement.
Wherein the component A, the component B and the component C are all powder.
The sludge conditioner provided by the invention solves the problem of cell bound water which is difficult to remove in sludge through wall breaking and chain breaking, and releases water in microorganisms in the sludge. The inorganic composite medicament is an inorganic composite medicament which is researched and developed by self and is formed by mixing a powdery conditioner A, a powdery conditioner B and a powdery conditioner C in proportion, and when the inorganic composite medicament is added, the powdery conditioner A and the powdery conditioner B are uniformly mixed with water in a dosing device to prepare an aqueous solution for adding, so that the conditioner and sludge can be easily and uniformly mixed. And the conditioner A, the conditioner B and the conditioner C are respectively stored in a powder form, so that the conditioner A, the conditioner B and the conditioner C do not react with each other to reduce the activity, and a good treatment effect is obtained. Moreover, due to the careful design of the components and the proportion, a small amount of the conditioner can achieve good conditioning effect.
The invention also provides a sludge drying treatment method, which adopts the sludge drying treatment system and the sludge conditioner to greatly reduce the water content of the sludge and relieve the pressure of a refuse landfill. The method comprises the following steps:
s1, diluting the raw sludge to a water content of more than 97%, and stirring to form a sludge solution with uniform quality;
s2, fully reacting the sludge solution in the S1 with a sludge conditioner for 0.5-1.0 h;
s3, precipitating the sludge solution after the S2 reaction to realize sludge-water separation;
s4, squeezing and dehydrating the sludge after mud-water separation to form a mud cake and discharging the mud; the squeezing dehydration time is 3-4 h, and the water content of the mud cake after squeezing dehydration is less than or equal to 60%.
Wherein in the step S3, the addition amount of the conditioner is 100-300 PPM.
Further, the sludge drying treatment system comprises a sludge diluting system, a sludge preparing tank, a sludge conditioning system, a sedimentation tank, a sludge storage tank and a plate-and-frame filter pressing system which are sequentially communicated;
the sludge diluting system is provided with a sludge inlet, the sludge enters the sludge diluting system from the sludge inlet through a sludge pump, passes through a sludge preparation tank, a sludge conditioning system and a sludge storage tank, enters the plate-and-frame filter pressing system for treatment and then is transported out through a transport vehicle.
Further, the method comprises the following steps:
s1, pumping the raw sludge into a sludge dilution system, diluting the raw sludge until the water content is 99%, and stirring the raw sludge to form a sludge solution with uniform quality; the sludge solution flows out of the sludge dilution system and enters a sludge preparation pool for storage;
s2, enabling the sludge solution to enter a conditioning device in a sludge conditioning system from a sludge preparation tank; adding a conditioner into the conditioning device by a dosing device to enable the conditioner to fully react with the sludge solution; wherein the addition amount of the conditioner is 100-300 PPM. The sludge solution stays in the conditioning device for 0.5-1.0 h;
s3, putting the sludge solution into a sedimentation tank for sedimentation to realize sludge-water separation; the separated sludge enters a sludge storage pool for storage;
s4, taking the sludge in the sludge storage tank, putting the sludge into a plate-and-frame filter pressing system, pressing and dehydrating, and discharging the sludge, wherein the pressing and dehydrating time is 3-4 hours, and the water content of the sludge after pressing and dehydrating is less than or equal to 60%.
Further, the sludge conditioning system comprises a dosing device and a conditioning device; the dosing device mixes the conditioner with water to form a conditioner solution, and the conditioner solution is conveyed into the conditioning device; and the sludge solution diluted by the sludge dilution system reacts with the conditioner solution in the conditioning device.
Further, the conditioning device can be rotated or provided with a stirring rod.
Compared with the prior art, the invention has the following advantages:
1. the sludge conditioner provided by the invention releases water in microorganisms in the sludge by breaking the wall and breaking the chain of the sludge, solves the problem of cell-bound water which is difficult to remove in the sludge, and provides a foundation for subsequent plate-and-frame filter pressing dehydration.
The principle of the conditioner for treating the sludge is as follows: the cement in the conditioner can be used as the core of sludge coagulation. Decomposing macromolecular groups in the sludge into small molecular groups by using polyferric chloride or polyaluminium chloride as a flocculating agent and polyacrylamide as a coagulant aid, and fully releasing water entrapped in the small molecular groups; breaking cell wall and chains to release cell water and interstitial water. Pollutants are solidified through forms of oxidation, adsorption, chelation and the like, the diameter of the floc can be increased, and compared with the floc formed by a conventional method, the floc formed by the method has the advantages of higher specific gravity, increased precipitation speed and capability of quickly realizing preliminary separation of mud and water. The formed floc has a firm structure, is not easy to break when being squeezed by a subsequent plate-and-frame filter press, and forms a larger sludge cake, thereby reducing fine sludge, improving the oxidation-reduction potential of the sludge, and preventing the sludge from smelling and re-dissolving.
2. The sludge drying treatment method provided by the invention can directly treat the excess sludge in the biochemical tank or the secondary sedimentation tank, and can treat the sludge from 99% of water content to below 60% at one time by adopting sectional dehydration. In the drying treatment process of the sludge, no heating process is carried out, so that no toxic and harmful gas is generated, no odor is generated, no dissolution is caused, and the treated sludge has a stable structure. Moreover, the system has high automation degree, various pumps and motors are in safety protection, various safety requirements meet the national standard, and the personal safety of workers is fully guaranteed.
The sludge treated by the sludge drying treatment system provided by the invention has obvious reduction, the weight of 1 ton of sludge with the water content of 80 percent is reduced to below 60 percent, the weight is below 0.5 ton, and the volume reduction is more than 50 percent. The transportation cost is reduced to less than half. Because the water content of the treated sludge is low, the activity of pathogens is inhibited, the sludge structure is stable and does not smell, and the harm of the sludge is reduced; the patent conditioner chelates and solidifies free heavy metal in sludge through adsorption, chelation and solidification functions through micro-charge reaction in the reaction process, so that the heavy metal form is converted into a stable state, the bioavailability of the heavy metal is reduced, and the ecological influence of the heavy metal is reduced.
3. The sludge drying treatment system provided by the invention adopts distributed treatment, and has the advantages of low investment, low energy consumption, simple operation and high system stability. Taking a sewage treatment plant with daily treatment capacity of 5 ten thousand tons/day as an example, the investment and construction cost is about 700 ten thousand. The annual electricity charge is about 25.51 ten thousand yuan (the electricity price is measured by 0.65 yuan/meter), which is not as high as 1/3 of other processes, so the method is suitable for wide popularization and use.
Drawings
FIG. 1 is a schematic structural view of a sludge drying treatment method of the present invention
FIG. 2 is a process flow diagram of a sludge drying treatment method of the invention
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Sludge conditioner
A sludge conditioner, which comprises a component A, a component B and a component C; the mass ratio of the component A to the component B to the component C is 1: 0.2-0.5: 0.15 to 0.2; wherein the component A is polymeric ferric chloride or polymeric aluminum chloride, and the component B is polyacrylamide; the component C is cement. The specific components and ratios are shown in table 1.
TABLE 1 concrete composition and ratio of component A, component B and component C
As can be seen from the above table, compared with the sludge flocs formed in comparative proportions 1 and 2, the sludge flocs formed in examples 1 to 4 are small, the sedimentation speed is low, and the clarity of the supernatant is general, so that the sludge flocs are large, the sedimentation speed is high, and the clarity of the supernatant is good, thereby powerfully and rapidly realizing sludge-water separation and preparing for subsequent plate frame dewatering.
Secondly, sludge drying treatment method
Referring to fig. 1, the sludge drying treatment method comprises the following steps:
and S1, pumping the raw sludge into a sludge dilution system, diluting the raw sludge to a water content of more than 97%, and stirring to form a sludge solution with uniform quality.
And S2, the sludge solution flows out of the sludge dilution system and enters a sludge preparation pool for storage.
S3, enabling the sludge solution to enter a conditioning device in a sludge conditioning system from a sludge preparation tank; adding a conditioner into the conditioning device by a dosing device to enable the conditioner to fully react with the sludge solution; wherein the addition amount of the conditioner is 100-300 PPM. The sludge solution stays in the conditioning device for 0.5-1.0 h.
And S4, putting the sludge solution into a sedimentation tank for sedimentation to realize sludge-water separation. And the separated sludge enters a sludge storage pool for storage.
S5, taking the sludge in the sludge storage tank, putting the sludge into a plate-and-frame filter pressing system, pressing and dehydrating, and discharging the sludge, wherein the pressing and dehydrating time is 3-4 hours, and the water content of the sludge after pressing and dehydrating is less than or equal to 60%.
The sludge drying treatment method is adopted for sludge treatment, and sludge is treated.
TABLE 2 comparison of sludge before and after dehydration in examples 1 to 4
As can be seen from Table 2, after the sludge treated by the sludge drying treatment method provided by the invention is diluted, conditioned and filter-pressed, the water content of the sludge cake is less than 60%, and the minimum water content is 52%. Greatly reduces the water content of the sludge, thereby greatly reducing the volume of the sludge, reducing the subsequent transportation cost and better realizing landfill and resource utilization.
The sludge drying treatment method provided by the invention is compared with other sludge treatment methods, for example, as shown in table 3, as can be seen from table 3, the sludge drying treatment method provided by the invention can reach the level equivalent to that of an integrated drying device and a high-temperature hydrolysis and anaerobic digestion process, and is even superior to other two treatment processes, the reduction of the sludge drying treatment method can reach below 40-60%, and the cost is only one fourth or even less than that of the other two processes. And the floor area is small, and the device is suitable for popularization and application.
TABLE 3 comparison of the sludge drying treatment method of the present invention with other sludge treatment methods
The sludge drying treatment method provided by the invention can treat the sludge from 99% of water content to below 60% at one time. In the drying treatment process of the sludge, the weight is reduced remarkably, after 1 ton of sludge with the water content of 80 percent is reduced to below 60 percent, the weight is below 0.5 ton, and the transportation cost is also reduced to below half. Because the water content of the treated sludge is low, the activity of pathogens is inhibited, the sludge structure is stable and does not smell, and the harm of the sludge is reduced; the patent conditioner chelates and solidifies free heavy metal in sludge through adsorption, chelation and solidification functions through micro-charge reaction in the reaction process, so that the heavy metal form is converted into a stable state, the bioavailability of the heavy metal is reduced, and the ecological influence of the heavy metal is reduced.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (3)
1. A sludge drying treatment method is characterized in that a sludge drying treatment system is adopted, and the method comprises the following steps:
s1, pumping the raw sludge into a sludge dilution system, diluting the raw sludge until the water content is 99%, and stirring the raw sludge to form a sludge solution with uniform quality; the sludge solution flows out of the sludge dilution system and enters a sludge preparation pool for storage;
s2, enabling the sludge solution to enter a conditioning device in a sludge conditioning system from a sludge preparation tank; adding a conditioner into the conditioning device by a dosing device to enable the conditioner to fully react with the sludge solution; wherein the addition amount of the conditioner is 100-300 PPM;
the sludge solution stays in the conditioning device for 0.5-1.0 h;
s3, putting the sludge solution into a sedimentation tank for sedimentation to realize sludge-water separation; the water content of the separated sludge is 97-98%, and the sludge enters a sludge storage pool to be stored;
s4, putting the sludge in the sludge storage pool into a plate-and-frame filter pressing system for pressing dehydration, and discharging the sludge, wherein the pressing dehydration time is 3-4 hours, and the water content of the sludge after pressing dehydration is less than or equal to 60%;
the sludge conditioner comprises a component A, a component B and a component C; the mass ratio of the component A to the component B to the component C is 1: 0.2-0.5: 0.15 to 0.2; wherein the component A is polymeric ferric chloride or polymeric aluminum chloride, and the component B is polyacrylamide; the component C is cement; the component A, the component B and the component C are all powder;
the sludge drying treatment system comprises a sludge diluting system, a sludge preparing tank, a sludge conditioning system, a sedimentation tank, a sludge storage tank and a plate-and-frame filter pressing system which are sequentially communicated;
the sludge diluting system is provided with a sludge inlet, the sludge enters the sludge diluting system from the sludge inlet through a sludge pump, passes through a sludge preparation tank, a sludge conditioning system and a sludge storage tank, enters the plate-and-frame filter pressing system for treatment and then is transported out through a transport vehicle.
2. The sludge drying treatment method according to claim 1, wherein the sludge conditioning system comprises a dosing device and a conditioning device; the dosing device mixes the conditioner with water to form a conditioner solution, and the conditioner solution is conveyed into the conditioning device; and the sludge solution diluted by the sludge dilution system reacts with the conditioner solution in the conditioning device.
3. The sludge drying treatment method as claimed in claim 1, wherein the conditioning device is capable of rotating or is provided with a stirring rod.
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