CN113880395B - Sludge dewatering complexing agent and sludge dewatering method - Google Patents
Sludge dewatering complexing agent and sludge dewatering method Download PDFInfo
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- CN113880395B CN113880395B CN202111016842.2A CN202111016842A CN113880395B CN 113880395 B CN113880395 B CN 113880395B CN 202111016842 A CN202111016842 A CN 202111016842A CN 113880395 B CN113880395 B CN 113880395B
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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
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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
- C02F11/02—Biological treatment
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- Hydrology & Water Resources (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Health & Medical Sciences (AREA)
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- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a sludge dewatering complexing agent and a sludge dewatering method, wherein the raw materials for preparing the sludge dewatering complexing agent comprise silicate minerals and citric acid bacillus. The sludge dewatering complexing agent provided by the invention can deeply dewater sludge, has strong dewatering capability and good volume reduction effect, has simple components, is convenient to use, is nontoxic and harmless, and does not cause secondary pollution.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, relates to a sludge dewatering complexing agent and a sludge dewatering method, and in particular relates to a sludge deep dewatering complexing agent and a method for dewatering sludge by using the same.
Background
Municipal sludge is a by-product generated in sewage treatment processes. With the emphasis on environmental problems and the increasing awareness of environmental pollution, the number and scale of sewage treatment plants have increased year by year. However, there are problems in that a large amount of municipal surplus sludge is inevitably produced in these sewage treatment processes, and the produced amount also shows a tendency to rapidly increase year by year. Because the surplus sludge is a high-plasticity fluid, the compressibility of the surplus sludge is extremely poor, and if the surplus sludge is directly dehydrated without conditioning, the water content of a sludge cake is still more than 90%, which is not beneficial to the subsequent treatment and recycling of the sludge. Therefore, the sludge must be effectively conditioned before dehydration to improve the dehydration performance of the sludge, so as to improve the dehydration effect of the sludge.
The sludge conditioning methods are generally classified into physical methods, chemical methods and biological methods according to the principle of their actions. In recent years, researchers have researched and developed various framework particles for conditioning sludge to improve the dewatering performance of the sludge, but most of the framework particles need to be combined with chemical conditioning agents to play a better role in dewatering the sludge, and if the framework particles are used alone, the effect is not obvious. CN106746475a discloses a composite polymer sludge dewatering flocculant and a preparation method thereof, wherein the dewatering flocculant is prepared from alkylamine polyoxyethylene ether phosphate, trimethylglycine, tetraethylenepentamine, heavy metal ion trapping agent, lignin sulfonate, polyvinylpyrrolidone, activated carbon, composite polymer ferric sulfate salt and ethyl acetate, and the composite medicament related to the patent application has a plurality of types, is complex in preparation method and large in dosage, and is not suitable for large-scale popularization and application. CN104724897a discloses a sludge dewatering conditioner and a use method thereof, the sludge dewatering conditioner comprises a coagulant, a coagulant aid, an oxidant, an ion exchanger and a surfactant, and the components of the patent application are complex and mainly exist in the form of oxides, so that flocculation and precipitation of Fe and Al ions are difficult to take place.
Therefore, it is desired to provide a dewatering agent which has a simple raw material and high dewatering efficiency and can achieve deep dewatering of sludge.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the sludge dewatering complexing agent and the sludge dewatering method, which can deeply dewater sludge, have strong dewatering capability and good volume reduction effect, and have the advantages of simple complexing agent components, convenient use, no toxicity or harm and no secondary pollution.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a sludge dewatering complexing agent, the sludge dewatering complexing agent comprising silicate minerals and Citrobacter (Citrobacter) as raw materials.
The silicate mineral structure included in the complexing agent disclosed by the invention contains a large amount of silicon dioxide, the complexing agent can be used as a skeleton construct, and simultaneously, the citric acid bacillus is added into the sludge dewatering complexing agent, the metabolism of the citric acid bacillus can generate chitin and/or chitosan, both the citric acid bacillus and the chitosan have a large amount of active functional groups (hydroxyl and amino), and the flocculation dewatering key process can be enhanced through mechanisms such as charge neutralization, bridging adsorption, electrostatic adsorption, capturing and precipitation, so that the sludge dewatering complexing agent provided by the invention can dewater sludge, and the cost is saved for the subsequent treatment of the sludge.
In order to further enhance the dehydration effect of the sludge dehydration complexing agent provided by the invention, as a preferable technical scheme of the invention, the silicate mineral contains aluminum ions and/or magnesium ions.
The aluminum ions and/or magnesium ions contained in silicate minerals are usually in the form of oxides, and the oxides have no coagulation and flocculation effects, and citric acid secreted by the citric acid bacillus can convert aluminum oxide into aluminum ions and magnesium oxide into magnesium ions, so that the aluminum ions and/or magnesium ions have coagulation and flocculation effects to further increase the dehydration effect; the sludge dewatering agent is matched with a framework structure formed by silicon dioxide, and can achieve the aim of deep dewatering of sludge in a synergistic way.
As a preferred embodiment of the present invention, the silicate mineral is selected from kaolin, and further selected from any one or a combination of at least two of kaolinite, montmorillonite or illite.
In order to provide the sludge dewatering complexing agent of the present invention with excellent dewatering effect, the silicate mineral of the present invention preferably has a specific surface area of 10 to 30m 2 /g, e.g. 12m 2 /g、15m 2 /g、18m 2 /g、20m 2 /g、22m 2 /g、25m 2 /g、28m 2 /g, etc.
As a preferable technical scheme of the invention, the sludge dewatering complexing agent comprises 60-80% of silicate mineral and 20-40% of citric acid bacillus, based on 100% of the total mass of the sludge dewatering complexing agent.
The 60-80% silicate mineral may be 62%, 65%, 68%, 70%, 72%, 75%, 78%, etc. The 20-40% of the Citrobacter may be 22%, 24%, 25%, 28%, 30%, 32%, 35%, 38%, etc.
The addition amount of silicate mineral is too large or too small, and although it has a certain dewatering effect, the dewatering effect of the sludge dewatering complexing agent provided by the invention may be weakened.
As a preferable technical scheme of the invention, the preparation raw materials of the sludge dewatering complexing agent comprise a culture solution containing the citric acid bacillus.
The Citrobacter of the present invention includes all strain types under the genus Citrobacter.
In general, the Citrobacter should be enriched by culturing, and in this case, the culture solution containing the Citrobacter may be directly used as a preparation raw material, or the Citrobacter may be extracted as a preparation raw material.
As for the culture solution containing Citrobacter, the present invention is not limited in any way, and any of the conventional mixed solutions containing Citrobacter can be used in the present invention, for example, a culture solution of Citrobacter obtained by culturing pure bacteria isolated and identified from a collection library with a culture medium, a culture solution of Citrobacter obtained by enrichment culture with mine wastewater, a related sediment, or the like, added with a related nutrient, or the like, and the present invention is not limited in any way.
In a second aspect, the present invention provides a method for preparing the sludge dewatering complexing agent according to the first aspect, comprising mixing and reacting silicate minerals with Citrobacter, preferably for 12-24 hours, such as 14 hours, 16 hours, 18 hours, 20 hours, 22 hours, etc.
Preferably, the preparation method comprises the following steps: mixing silicate minerals and a culture solution containing the citric acid bacillus and reacting for 12-24 hours to obtain the sludge dewatering complexing agent.
In the sludge dewatering complexing agent provided by the invention, the water-containing silicate minerals mainly containing aluminum and magnesium can use abundant silicon dioxide as a framework structure, meanwhile, the metabolic products of the citric acid bacillus can enhance the key process of flocculation dewatering, citric acid secreted by the citric acid bacillus can convert alumina and the like contained into ions capable of being coagulated, and the ions are matched with the framework structure formed by the silicon dioxide to realize synergistic interaction, so that the purpose of deep dewatering of sludge can be achieved.
In a third aspect, the present invention provides a method of dewatering sludge, the method comprising: the sludge is mixed with the sludge dewatering complexing agent according to the first aspect under stirring and then dewatered, preferably by mechanical press filtration.
As a preferable technical scheme of the invention, the feeding amount of the sludge dewatering complexing agent is 1-3g/g of dry sludge, for example, 1.2g/g of dry sludge, 1.5g/g of dry sludge, 1.8g/g of dry sludge, 2.0g/g of dry sludge, 2.2g/g of dry sludge, 2.5g/g of dry sludge, 2.8g/g of dry sludge and the like.
The sludge dewatering complexing agent provided by the invention can treat sludge with high water content and sludge with higher water content, and for the residual sludge in the sewage treatment process, the water content of the sludge is generally 95.0-98.5%, such as 96%, 97%, 98% and the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) The silicate mineral structure included in the complexing agent is used as a skeleton construct, and the metabolic product of the citric acid bacillus can enhance the dehydration key process of flocculation, and the silicate mineral structure and the metabolic product of the citric acid bacillus are matched with each other, so that the sludge dehydration complexing agent provided by the invention can dehydrate sludge;
(2) The citric acid secreted by the citric acid bacillus can convert aluminum oxide into aluminum ions, and magnesium oxide into magnesium ions, so that the aluminum ions and/or the magnesium ions have coagulation and flocculation effects, and the aluminum ions and/or the magnesium ions are matched with a framework structure formed by silicon dioxide to realize synergistic interaction, so that the purpose of deep dehydration of sludge can be achieved;
(3) The sludge dewatering complexing agent provided by the invention has the advantages of simple and easily obtained raw materials, convenience in use, simple preparation method, lower treatment cost, no toxicity and no harm, and does not cause secondary pollution;
(4) The sludge dewatering complexing agent provided by the invention can realize deep dewatering of sludge, save cost for subsequent treatment of sludge, and reduce environmental pressure.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It should be apparent to those skilled in the art that the detailed description is merely provided to aid in understanding the invention and should not be taken as limiting the invention in any way.
Example 1
The embodiment provides a sludge dewatering complexing agent and a sludge dewatering method.
(1) Inoculating Citrobacter sp.Strain DBM (No. M208248) to a strain consisting of 10.0 g CH 3 COONa, 1.0g peptone, 1.0g K 2 HPO 4 1.0g (NH) 4 ) 2 SO 4 0.25 g MgSO 4 0.05 g CaCl 2 0.05 g NaCl and 0.25 g FeCl 3 Growth in composed acetate medium (MAM) was performed on a rotary shaker (120 rpm, 30 ℃) for 48 hours. Removing cells by centrifugation (10000 rpm, 30 min, 4 ℃) to obtain a culture supernatant of Citrobacter;
(2) Kaolin purchased from Shanghai Biochemical Co., ltd, and having a composition of Al 2 Si 2 O 9 H 4 The specific surface area is 20m 2 Mixing with a citric acid bacillus culture solution (according to the mass of the citric acid bacillus) according to the mass ratio of 7:3, uniformly stirring, and reacting for 12 hours to obtain a sludge dewatering complexing agent;
(3) Homogenizing and stirring sludge from a sewage treatment plant in Fuzhou, adjusting the water content to 98.5%, adding a sludge dehydration complexing agent into the sludge, and continuously stirring the sludge with the addition amount of 1.0g/g of dry sludge;
(4) And conveying the conditioned sludge to a plate-and-frame filter press through a sludge pump for mechanical filter pressing and dehydration.
Example 2
The embodiment provides a sludge dewatering complexing agent and a sludge dewatering method.
(1) Selecting acid mine wastewater sediment of a certain iron ore dumping site of Fujian, wherein the pH value is about 3.24, the conductivity is about 782 mu s/cm, the total organic carbon is 0.52kg/kg of soil sample, enriching and culturing the acid mine wastewater sediment in a citric acid bacteria culture medium, and centrifugally separating the acid mine wastewater sediment to obtain a culture solution of the citric acid bacteria;
(2) Kaolin chemical purity reagent purchased from Shanghai Biochemical reagent Co., ltd, and having the composition of Al 2 Si 2 O 9 H 4 Specific surface area of 22m 2 Mixing the mixture with a citric acid bacillus culture solution (according to the mass of the citric acid bacillus) according to the mass ratio of 8:2, uniformly stirring, and reacting for 24 hours to obtain a sludge dewatering complexing agent;
(3) Homogenizing and stirring sludge of a sewage treatment plant in Fuzhou, adjusting the water content to 98%, adding a sludge dewatering complexing agent into the sludge, and continuously stirring the sludge with the addition amount of 2.5g/g of dry sludge;
(4) And conveying the conditioned sludge to a plate-and-frame filter press through a sludge pump for mechanical filter pressing and dehydration.
Example 3
The embodiment provides a sludge dewatering complexing agent and a sludge dewatering method.
(1) Selecting Citrobacter sp.Strain DBM (No. M208248), and performing aerobic culture until logarithmic phase (OD=0.3) to obtain culture solution containing Citrobacter;
(2) Kaolin has a specific surface area of 25m and is purchased from Shanghai Biochemical reagent Co., ltd 2 Mixing with a citric acid bacillus culture solution (according to the mass of the citric acid bacillus) according to the mass ratio of 6:4, uniformly stirring, and reacting for 24 hours to obtain a sludge dewatering complexing agent;
(3) Homogenizing and stirring sludge of a sewage treatment plant in Fuzhou, adjusting the water content to 98%, adding a sludge dewatering complexing agent into the sludge, and continuously stirring the sludge with the adding amount of 3.0g/g of dry sludge;
(4) And conveying the conditioned sludge to a plate-and-frame filter press through a sludge pump for mechanical filter pressing and dehydration.
Comparative example 1
This comparative example provides a method for dewatering sludge.
The difference from example 2 is that the sludge dewatering complexing agent is replaced with the kaolin chemically pure agent in example 2.
Comparative example 2
This comparative example provides a method for dewatering sludge.
The difference from example 2 is that the sludge dewatering complexing agent provided in example 2 is replaced with the culture solution containing the Citrobacter obtained in step (1) of example 2.
Comparative example 3
This comparative example provides a method for dewatering sludge.
The difference from example 3 is that the specific surface area in example 3 was 25m 2 Kaolin/g was replaced by a kaolin having a specific surface area of 8m 2 Kaolin per gram.
Comparative example 4
This comparative example provides a method for dewatering sludge.
The difference from example 3 is that the mass ratio of kaolin to the culture broth of Citrobacter (by mass of Citrobacter) in example 3 is replaced by 5:5.
Performance test:
the sludge before and after dewatering of examples 1 to 3 and comparative examples 1 to 4 was subjected to performance test as follows:
(1) Water content:
wherein Wc (%) is the water content of the sludge; m (g) is the mass of the weighed sludge sample; m is m 2 (g) Drying the sludge sample to constant weight at 105 ℃, and adding the mass of the sludge sample into an evaporation dish; m is m 1 (g) Is the mass of the constant weight evaporation dish.
(2) Compression ratio:wherein S is the sludge compression rate and P i And P 0 Is two different filtration pressures, SRF i And SRF (SRF) 0 Respectively P 1 And P 2 Is a specific resistance to filtration.
The test results are shown in Table 1:
TABLE 1
According to the embodiment and the comparative example, the sludge dewatering complexing agent provided by the invention has a good dewatering effect, can be used for deep dewatering of sludge, and can save a large amount of cost for subsequent treatment of sludge.
While the invention has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (13)
1. The sludge dewatering complexing agent is characterized in that the preparation raw materials of the sludge dewatering complexing agent comprise 60-80% of silicate minerals and 20-40% of citric acid bacillus, based on 100% of the total mass of the sludge dewatering complexing agent.
2. The sludge dewatering complexing agent according to claim 1, wherein the silicate mineral contains aluminum ions and/or magnesium ions.
3. The sludge dewatering complexing agent of claim 2 wherein the silicate mineral is selected from the group consisting of kaolin.
4. A sludge dewatering complexing agent as claimed in claim 3, wherein the silicate mineral is selected from any one or a combination of at least two of kaolinite, montmorillonite or illite.
5. The sludge dewatering complexing agent of claim 1 or 2, wherein the silicate mineral has a specific surface area of 10-30m 2 /g。
6. The sludge dewatering complexing agent according to claim 1 or 2, wherein the raw materials for preparing the sludge dewatering complexing agent comprise a culture solution containing the citrobacter.
7. The method for producing a sludge dewatering complexing agent as claimed in any one of claims 1 to 6, wherein the method comprises mixing and reacting silicate minerals with Citrobacter.
8. The method of claim 7, wherein the reaction is performed for a period of time ranging from 12 to 24 h.
9. The production method according to claim 7 or 8, characterized in that the production method comprises: mixing silicate mineral and culture solution containing the citric acid bacillus and reacting 12-24h to obtain the sludge dewatering complexing agent.
10. A method of dewatering sludge, the method comprising: the sludge is mixed with the sludge dewatering complexing agent according to any one of claims 1 to 6 under stirring, and then dewatered.
11. The method of claim 10, wherein the dewatering is performed by mechanical press filtration.
12. The method according to claim 10 or 11, characterized in that the sludge dewatering complexing agent is dosed in an amount of 1-3g/g dry sludge.
13. The method according to claim 10 or 11, characterized in that the water content of the sludge is 95.0-98.5%.
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| JPH11276160A (en) * | 1998-03-31 | 1999-10-12 | Takuma Co Ltd | Coagulant-producing microorganism having organic acid substrate assimilating characteristic, its microbial coagulant, and treatment of sewage and sludge using the coagulant |
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