CN113998863A - Deep dehydration treatment method for sludge - Google Patents
Deep dehydration treatment method for sludge Download PDFInfo
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- CN113998863A CN113998863A CN202111426449.0A CN202111426449A CN113998863A CN 113998863 A CN113998863 A CN 113998863A CN 202111426449 A CN202111426449 A CN 202111426449A CN 113998863 A CN113998863 A CN 113998863A
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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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a sludge deep dehydration treatment method, which comprises the following steps of adding coagulant aid solution into sludge with the water content of 99% according to the feeding proportion of 2.6kg/t, and carrying out concentration treatment by using a belt type concentrator to obtain sludge with the water content of 97%; adding a sludge compound conditioning agent into the concentrated sludge at a feeding ratio of 5L/m3And fully mixing the medicament and the sludge; adding silicate into the sludge, wherein the adding proportion is 0.5 percent of the dry weight of the sludge, and uniformly mixing; and (4) performing filter pressing treatment on the conditioned sludge to finish deep dehydration of the sludge. The sludge deep dehydration treatment method of the invention combines adsorption precipitationThe physical means of the reduction is to gather the solid matters of the sludge, the oxidation means of the strong oxidizer is to oxidize and degrade the organic pollutants and kill the pathogens, and finally the mechanical means is combined to remove the water to achieve the purpose of deep dehydration. The treatment method disclosed by the invention is low in cost, strong in operability, simple in operation and free of threshold, and is suitable for large-scale popularization and application.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to a sludge deep dehydration treatment method.
Background
The economy is gradually developed, the living standard of people is gradually improved, and the sewage discharge amount and the sewage treatment amount are also gradually increased. The sludge is a residual product of sewage treatment and is mainly characterized by high organic matter content, easy decay and odor, high water content and containing a large amount of harmful substances such as pathogenic microorganisms, parasitic ova or heavy metals. The sludge contains a large amount of water, which causes the problems of large volume, easy rheology, high transportation cost, large capacity of treatment equipment, poor economical efficiency of treatment and disposal, and the like. In order to increase the concentration of available substances in the sludge and facilitate transportation and subsequent treatment (such as recycling, incineration and the like), the water content in the sludge and the content of metal elements such as iron, aluminum and the like need to be effectively reduced.
Municipal sludge has a very high water content. Generally, the water content of the sludge in the secondary sedimentation tank of the sewage plant is more than 99 percent, and the water content of the sludge in the gravity concentration tank of the sewage plant is also about 97 percent. The water content of the sludge is different, and the state of the sludge is different, so that the method and means which can be selected for the treatment and disposal of the sludge are directly influenced. Therefore, in any disposal method, sludge needs to be treated first, and the municipal sludge is stabilized and reduced to obtain dried/semi-dried sludge.
The existing treatment method of excess sludge of urban sewage treatment plants is mainly a treatment process of plate-frame dehydration and drying, wherein concentrated excess sludge with the water content of about 97% is conditioned by ferric salt and Polyacrylamide (PAM), then is uniformly stirred and is introduced into a mechanical sludge dehydration device to squeeze and dehydrate the sludge, and the sludge can be dehydrated to the water content of less than 60%. However, because the internal structure of the sludge is not damaged in the implementation of the process, the water in the sludge cake is not released, and the sludge cake still has higher water content; the dewatered sludge is treated by burning, and iron in the sludge cake is easy to cause corrosion of the incinerator.
When the conventional method is adopted to condition the sludge, the defects of poor conditioning effect, high cost, poor resource utilization effect and the like exist, the sludge can reach the national sludge standard for landfill only by further drying treatment, and the conditioned sludge has low pH value and is acidic and not beneficial to direct resource utilization. In addition, the existing sludge oxidation wall-breaking conditioning method has the defects of harsh conditioning conditions, high conditioning cost, large influence of the conditioner on subsequent sludge treatment (such as large increment of dry solid of sludge) and the like, so that the existing sludge oxidation wall-breaking conditioning method cannot be widely applied in engineering.
Therefore, it is necessary to develop a simple, fast and low-cost sewage pretreatment method.
Disclosure of Invention
The invention aims to provide a sludge deep dehydration treatment method to overcome the defects that the existing sludge deep dehydration treatment method is harsh in conditioning conditions, high in conditioning cost, large in influence of a conditioner on subsequent sludge treatment and the like.
In order to solve the technical problem, the invention provides a sludge deep dehydration treatment method, which comprises the following steps:
s01: adding a coagulant aid into sludge with the water content of 99%, wherein the adding proportion is 2.6kg/t, and concentrating by using a belt concentrator to obtain sludge with the water content of 97%;
s02: adding a sludge compound conditioning agent into the concentrated sludge at a feeding ratio of 5L/m3And fully mixing the medicament and the sludge;
s03: adding silicate into the sludge, wherein the adding proportion is 0.5 percent of the dry weight of the sludge, and uniformly mixing;
s04: and (4) performing filter pressing treatment on the conditioned sludge to finish deep dehydration of the sludge.
Preferably, the preparation method of the sludge composite conditioning agent comprises the following steps:
a solution of polymeric ferric sulfate with the mass fraction of 11% and a hydrogen peroxide solution with the mass fraction of 6% are mixed according to the weight ratio of 3: 2, mixing well.
Preferably, the coagulant aid is a polyacrylamide solution.
Further preferably, the mass fraction of the polyacrylamide solution is 1-2 per mill.
Preferably, the mixing mode of the sludge composite conditioning agent is stirring for 60min at the rotating speed of 100 rpm.
Preferably, the silicate is mixed by stirring at 100rpm for 5 min.
Preferably, the processing machine of the filter pressing treatment is a plate-and-frame filter press.
Further preferably, the filter pressing conditions of the plate-and-frame filter press are that the mud feeding pressure is controlled to be 0.8-1.2 MPa, and the pressing pressure is 2 MPa.
Further preferably, the filter pressing time of the plate-and-frame filter press is 1.5-2.5 h.
Preferably, the silicate is at least one of potassium silicate or sodium silicate.
The invention provides a sludge deep dehydration treatment method, which comprises the following steps: s01: adding coagulant aid solution into sludge with water content of 99% at a feeding ratio of 2.6kg/t, and concentrating by using a belt concentrator to obtain sludge with water content of 97%; s02: adding a sludge compound conditioning agent into the concentrated sludge at a feeding ratio of 5L/m3And fully mixing the medicament and the sludge; s03: adding silicate into the sludge, wherein the adding proportion is 0.5 percent of the dry weight of the sludge, and uniformly mixing; s04: and (4) performing filter pressing treatment on the conditioned sludge to finish deep dehydration of the sludge. Compared with the prior art, the deep dehydration treatment method of sludge combines the physical adsorption sedimentationThe method comprises the steps of gathering solid matters of sludge, oxidizing by a strong oxidizer, oxidizing and degrading organic pollutants, killing pathogens, and finally removing water by combining a mechanical method to achieve the purpose of deep dehydration. The selected oxidant is hydrogen peroxide, the oxidant is a green oxidant, the product is water, the adopted polymeric ferric sulfate is more green and environment-friendly compared with aluminum salt, and the high-efficiency coagulant aid, namely polyacrylamide, is combined, so that suspended particles are rapidly aggregated, and silicate is further polymerized to destroy the porous structure of the suspended particles, thereby paving a road for final mechanical dehydration. The sludge deep dehydration treatment method disclosed by the invention is low in cost, strong in operability, simple in operation and free of threshold, and is suitable for large-scale popularization and application.
Drawings
FIG. 1 is a process flow diagram of a sludge deep dehydration treatment method according to an embodiment of the invention.
Detailed Description
In order that the invention may be more readily understood, reference will now be made to the following more particular description of the invention, examples of which are set forth below. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete. The various starting materials used in the examples are, unless otherwise indicated, conventional commercial products.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The numerical values set forth in the examples of the present invention are approximations, not necessarily values. All values within the error range may be included without limiting to the specific values disclosed in the embodiments of the present invention, where the error or experimental conditions allow.
The numerical ranges disclosed in the examples of the present invention are intended to indicate the relative amounts of the components in the mixture and the ranges of temperatures or other parameters recited in the other method examples.
The embodiment of the invention provides a sludge deep dehydration treatment method, which comprises the following steps:
s01: adding a coagulant aid into sludge with the water content of 99%, wherein the adding proportion is 2.6kg/t, and concentrating by using a belt concentrator to obtain sludge with the water content of 97%;
s02: adding a sludge compound conditioning agent into the concentrated sludge at a feeding ratio of 5L/m3And fully mixing the medicament and the sludge;
s03: adding silicate into the sludge, wherein the adding proportion is 0.5 percent of the dry weight of the sludge, and uniformly mixing;
s04: and (4) performing filter pressing treatment on the conditioned sludge to finish deep dehydration of the sludge.
Specifically, in step S01, the coagulant aid is a polyacrylamide solution. Compared with other coagulant aids, polyacrylamide has the following advantages:
(1) the dosage of the flocculant is reduced. On the premise of achieving the same water quality, the polyacrylamide is used as a coagulant aid to be matched with other flocculants, so that the use amount of the flocculants can be greatly reduced;
(2) improve the water quality. In drinking water treatment and industrial wastewater treatment, the polyacrylamide and the inorganic flocculant are used in a matching way, so that the water quality can be obviously improved;
(3) the strength and the settling speed of the flocs are improved. The strength of the floc formed by polyacrylamide is high, and the settling property is good, so that the solid-liquid separation speed is increased, and the sludge dewatering is facilitated;
(4) and corrosion prevention and scale prevention of the circulating cooling system. The use of the polyacrylamide can greatly reduce the use amount of the inorganic flocculant, thereby avoiding the deposition of inorganic substances on the surface of equipment and slowing down the corrosion and scaling of the equipment. Polyacrylamide has many advantages, one of which is worth popularizing.
In a further preferred embodiment, the mass fraction of the polyacrylamide solution is 1-2 ‰. Because polyacrylamide works well, it requires only small amounts to achieve this effect, and this concentration is chosen considering that more dilute polyacrylamide solutions are more easily dispersed.
Specifically, in step S02, the preparation method of the sludge composite conditioning agent includes:
a solution of polymeric ferric sulfate with the mass fraction of 11% and a hydrogen peroxide solution with the mass fraction of 6% are mixed according to the weight ratio of 3: 2, mixing well. The polyferric sulfate is a novel, high-quality and high-efficiency ferric salt inorganic polymeric flocculant, is mainly used for water purification with excellent effect and good water quality, does not contain harmful substances such as aluminum, chlorine, heavy metal ions and the like, does not have the transfer of water containing iron ions, is nontoxic, harmless, safe and reliable, and has obvious effects of turbidity removal, decoloration, deoiling, dehydration, degerming, deodorization, algae removal, COD, BOD and heavy metal ions removal in water and the like. The sludge is mainly characterized by high organic matter content, easy decay and odor, high water content and containing a large amount of harmful substances such as pathogenic microorganisms, parasitic ova or heavy metals. The polyferric sulfate can be used for deoiling, dehydrating, degerming, deodorizing, removing algae and removing COD, BOD and heavy metal ions in water, and is very suitable. Only the polymeric ferric sulfate has insufficient oxidation capability, and organic matters and pathogenic microorganisms are difficult to completely remove by light adsorption, so hydrogen peroxide is needed to be matched with sterilization and deodorization to oxidize and degrade organic pollutants. Specifically, in a preferred embodiment, the sludge composite conditioning agent is mixed by stirring at a rotation speed of 100rpm for 60 min. The physical flocculation effect of the composite conditioning agent treatment and the oxidation sterilization degradation effect in the chemical aspect are also achieved, so that the process is more thorough due to the fact that long time is needed and the uniform stirring is achieved, and therefore the rotating speed of 100 revolutions is selected and the stirring is carried out for one hour. Selecting 5L/m3The dosage of the composite conditioning agent is used for better conditioning water, the composite conditioning agent has rich functions and obvious effect, and is a core functional component, so the demand is large.
Specifically, in step S03, the silicate is at least one of potassium silicate or sodium silicate. Silicate can play fine adhesive action, preliminary flocculation can be subsided pollutant particle flocculation, but form loose porous state very easily, and the lower easy quilt of flocculation state physical strength who forms destroys, consequently need add silicate and make loose porous flocculation state become durable inseparable, and silicate can strengthen its physical strength and stability greatly, make the effect of subsiding more showing, loose porous state's improvement also can reduce a large amount of claddings to moisture, make follow-up dehydration process more smooth. The silicate also has strong ammonia nitrogen removal capability, the function is very important in the sludge of eutrophic water body, the eutrophication is improved fundamentally, and the sodium silicate is low in price and has an outstanding function, so that the addition amount is large and is 0.5 percent of the dry weight of the sludge.
In a specific embodiment, the silicate is mixed by stirring at 100rpm for 5 min. Because the silicate is very active in nature and has a quick bonding effect, the silicate is easy to agglomerate within five minutes, the formed strength is further increased after the silicate is too long, the subsequent filter pressing process is not facilitated, and therefore the treatment efficiency is improved by selecting five minutes and reducing the time consumption of the whole process.
Specifically, in step S04, the processing machine for the filter pressing process is a plate and frame filter press. The plate-frame filter press has the advantages of simple structure, easy operation, stable operation and convenient maintenance. The filter area selection range is flexible, and the occupied area is small. Has strong adaptability to materials and is suitable for various small and medium-sized sludge dewatering occasions. The filter pressing of the sludge is very suitable, the cost can be effectively reduced, and the operation is convenient.
In a further preferable embodiment, the filter pressing condition of the plate-and-frame filter press is that the mud feeding pressure is controlled to be 0.8-1.2 MPa, and the pressing pressure is 2 MPa. The pressure is screened by considering the factors of the intensity, the density, the loading capacity of the machine, the horsepower of the machine and the like of the treated sludge, so that the sludge can work quickly and continuously.
In a further preferable embodiment, the filter pressing time of the plate-and-frame filter press is 1.5-2.5 h. The filter pressing is for deep dehydration, so a long time is needed, the requirement can be met after the test of 1.5 h-2.5, and the filter pressing can be specifically adjusted according to specific conditions.
The sludge deep dehydration treatment method provided by the embodiment of the invention combines a physical means of adsorption and sedimentation, gathers solid matters of sludge, uses an oxidation means of a strong oxidant to oxidize and degrade organic pollutants and kill pathogens, and finally combines a mechanical means to remove water to achieve the purpose of deep dehydration. On one hand, a plurality of flocculating agents and coagulant aids are adopted to settle the particles; in addition, the water body cleaning degree is greatly improved by adopting multiple functional costs and integrating the functions of turbidity removal, decoloration, deoiling, dehydration, degerming, deodorization, algae removal, removal of COD, BOD and heavy metal ions in water, ammonia nitrogen removal, oxidation, sterilization, degradation and the like; the dewatering is completed by means of flocculation, aggregation, adhesion, physical filter pressing and the like, and finally the effects of deep dewatering and water body cleaning are achieved.
In conclusion, the invention provides a sludge deep dehydration treatment method, which comprises the following steps of adding coagulant aid solution into sludge with the water content of 99% at the feeding proportion of 2.6kg/t, and carrying out concentration treatment by using a belt type concentrator to obtain sludge with the water content of 97%; adding a sludge compound conditioning agent into the concentrated sludge at a feeding ratio of 5L/m3And fully mixing the medicament and the sludge; adding silicate into the sludge, wherein the adding proportion is 0.5 percent of the dry weight of the sludge, and uniformly mixing; and (4) performing filter pressing treatment on the conditioned sludge to finish deep dehydration of the sludge. The sludge deep dehydration treatment method combines the physical means of adsorption and sedimentation, gathers the solid matters of the sludge, uses the oxidation means of strong oxidizer to oxidize and degrade organic pollutants and kill pathogens, and finally combines the mechanical means to remove water to achieve the purpose of deep dehydration. The treatment method disclosed by the invention is low in cost, strong in operability, simple in operation and free of threshold, and is suitable for large-scale popularization and application.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The deep dehydration treatment method of the sludge is characterized by comprising the following steps:
s01: adding coagulant aid solution into sludge with water content of 99% at a feeding ratio of 2.6kg/t, and concentrating by using a belt concentrator to obtain sludge with water content of 97%;
s02: adding a sludge compound conditioning agent into the concentrated sludge at a feeding ratio of 5L/m3And fully mixing the medicament and the sludge;
s03: adding silicate into the sludge, wherein the adding proportion is 0.5 percent of the dry weight of the sludge, and uniformly mixing;
s04: and (4) performing filter pressing treatment on the conditioned sludge to finish deep dehydration of the sludge.
2. The method for deep dehydration treatment of sludge according to claim 1, characterized in that: the preparation method of the sludge composite conditioning agent comprises the following steps:
a solution of polymeric ferric sulfate with the mass fraction of 11% and a hydrogen peroxide solution with the mass fraction of 6% are mixed according to the weight ratio of 3: 2, mixing well.
3. The method for deep dehydration treatment of sludge according to claim 1, characterized in that: the coagulant aid is a polyacrylamide solution.
4. A method for deep dewatering of sludge as claimed in claim 3, wherein: the mass fraction of the polyacrylamide solution is 1-2 per mill.
5. The method for deep dehydration treatment of sludge according to claim 1, characterized in that: the mixing mode of the sludge composite conditioning agent is stirring for 60min at the rotating speed of 100 rpm.
6. The method for deep dehydration treatment of sludge according to claim 1, characterized in that: the silicate was mixed by stirring at 100rpm for 5 min.
7. The method for deep dehydration treatment of sludge according to claim 1, characterized in that: and the filter pressing treatment machine is a plate and frame filter press.
8. The method for deep dehydration treatment of sludge according to claim 7, characterized in that: the filter pressing conditions of the plate-and-frame filter press are that the mud feeding pressure is controlled to be 0.8-1.2 MPa, and the pressing pressure is 2 MPa.
9. The method for deep dehydration treatment of sludge according to claim 7, characterized in that: the filter pressing time of the plate-and-frame filter press is 1.5-2.5 h.
10. The method for deep dehydration treatment of sludge according to claim 1, characterized in that: the silicate is at least one of potassium silicate or sodium silicate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114538745A (en) * | 2022-03-24 | 2022-05-27 | 广东卓信环境科技股份有限公司 | Sludge conditioner and sludge dewatering method |
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Application publication date: 20220201 |