CN113072275A - Novel water treatment process for sludge synergism - Google Patents
Novel water treatment process for sludge synergism Download PDFInfo
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- CN113072275A CN113072275A CN202110355793.9A CN202110355793A CN113072275A CN 113072275 A CN113072275 A CN 113072275A CN 202110355793 A CN202110355793 A CN 202110355793A CN 113072275 A CN113072275 A CN 113072275A
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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
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Biodiversity & Conservation Biology (AREA)
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- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a novel water treatment process for sludge synergism, which comprises the following steps: A. firstly, putting sludge into a domestic sewage treatment plant for treatment to obtain first-stage sludge; B. and (4) retreating the sludge in the first stage to obtain the sludge in the second stage. The water treatment process adopted by the invention is simple to operate, the sludge treated by the domestic sewage treatment plant contains rich organic matters, nitrogen, phosphorus and other nutrient elements, and the sludge is put into a biochemical system of the industrial sewage treatment plant, so that the B/C ratio is improved, meanwhile, C, N, P and other nutrient elements are supplemented, the problem that the growth and the propagation of microorganisms are not facilitated due to low water inlet nutrient substances is solved, and the biochemical property of the biological treatment system is improved. Also solves the problem of slow increment of the concentration of the activated sludge, and is convenient for popularization and use.
Description
Technical Field
The invention relates to the technical field of water treatment processes, in particular to a novel water treatment process for sludge synergism.
Background
In recent decades, the urban sewage treatment and conventional sludge treatment technologies in China gradually mature and develop in large scale, but the sewage treatment plants still need to be innovated in the treatment technical means of the two fields.
In one aspect, industrial wastewater treated by an industrial wastewater treatment plant refers to wastewater, sewage and waste liquid produced in an industrial process, which contains industrial materials, intermediates and products lost with water, and pollutants produced in the process. The main characteristic of industrial waste water is that the content of organic matter is very high, but the B/C is extremely low, and is below 0.3. The biodegradability of the high-concentration refractory organic wastewater is particularly low, and the increase of the activated sludge value of a biological treatment section is slow after the high-concentration refractory organic wastewater enters a biochemical system, because the nutrient substances in the wastewater are difficult to be taken by microorganisms, the efficiency of degrading organic matters by the microorganisms and removing nitrogen and phosphorus is reduced.
On the other hand, the final objective of sludge treatment is to achieve reduction, stabilization, detoxification, and recycling of sludge. The sludge treatment is divided into two stages from the technical and operation aspects, and the first stage is to carry out reduction and stabilization treatment on sludge in a sewage treatment plant. The purpose is to reduce the risk of secondary pollution caused by outward transportation of the treated sludge. The second stage is to carry out reasonable and safe disposal on the treated sludge so that the sludge can achieve the purposes of harmlessness and reclamation. For sewage treatment plants. The sludge treatment and the outward transportation need larger cost, so the realization of the reduction of the sludge is a necessary way for each water plant to create the effect.
Disclosure of Invention
The invention aims to provide a novel water treatment process for sludge synergism, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a novel water treatment process for sludge synergism comprises the following steps:
A. firstly, putting sludge into a domestic sewage treatment plant for treatment to obtain first-stage sludge;
B. and (4) retreating the sludge in the first stage to obtain the sludge in the second stage.
Preferably, in the step a, the sludge is mechanically dewatered, specifically, the sludge is dewatered by a sludge dewatering machine.
Preferably, the first stage sludge reprocessing method in step B is as follows:
a. firstly, putting the sludge of the first stage into a stirring tank, putting a treating agent into the stirring tank, and fully stirring and mixing the treating agent and the sludge of the first stage to obtain a sludge mixture;
b. then the sludge mixture is put into an anaerobic fermentation tank for anaerobic fermentation.
Preferably, the treating agent in the step a comprises, by weight, 10-20 parts of polyacrylamide, 8-20 parts of polyaluminum ferric chloride, 4-10 parts of aluminum nitrate, 5-15 parts of ferric sulfate, 4-10 parts of fluorite, 3-9 parts of kaolin, 6-12 parts of tetrabutylammonium iodide and 10-20 parts of active diatomite.
Preferably, the anaerobic fermentation method in step b is as follows: adding alkali into the sludge, stirring, and adjusting and maintaining the pH value of the residual sludge to be 9-10, wherein the stirring speed is 8000-.
Preferably, the alkali is one or more of sodium hydroxide, potassium hydroxide or calcium hydroxide.
Preferably, the anaerobic fermentation temperature is 45-55 ℃ and the time is 8-10 days.
Preferably, the concentration of dissolved oxygen in the excess sludge during anaerobic fermentation is 0.1-0.2 mg/L.
Compared with the prior art, the invention has the beneficial effects that: the water treatment process adopted by the invention is simple to operate, the sludge treated by the domestic sewage treatment plant contains rich organic matters, nitrogen, phosphorus and other nutrient elements, and the sludge is put into a biochemical system of the industrial sewage treatment plant, so that the B/C ratio is improved, meanwhile, C, N, P and other nutrient elements are supplemented, the problem that the growth and the propagation of microorganisms are not facilitated due to low water inlet nutrient substances is solved, and the biochemical property of the biological treatment system is improved. Also solves the problem of slow increment of the concentration of the activated sludge, and is convenient for popularization and use.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the invention provides the following technical scheme: a novel water treatment process for sludge synergism comprises the following steps:
A. firstly, putting sludge into a domestic sewage treatment plant for treatment to obtain first-stage sludge;
B. and (4) retreating the sludge in the first stage to obtain the sludge in the second stage.
In this embodiment, in the step a, the sludge is mechanically dewatered, specifically, the sludge is dewatered by a sludge dewatering machine.
In this example, the first stage sludge reprocessing method in step B is as follows:
a. firstly, putting the sludge of the first stage into a stirring tank, putting a treating agent into the stirring tank, and fully stirring and mixing the treating agent and the sludge of the first stage to obtain a sludge mixture;
b. then the sludge mixture is put into an anaerobic fermentation tank for anaerobic fermentation.
In this embodiment, the treating agent in step a includes, by weight, 10 parts of polyacrylamide, 8 parts of polyaluminum ferric chloride, 4 parts of aluminum nitrate, 5 parts of ferric sulfate, 4 parts of fluorite, 3 parts of kaolin, 6 parts of tetrabutylammonium iodide, and 10 parts of active diatomite.
In this example, the anaerobic fermentation method in step b is as follows: adding alkali into the sludge, stirring, and adjusting and maintaining the pH value of the residual sludge to be 9, wherein the stirring speed is 8000 rpm, and the stirring time is 2 hours.
In this example, sodium hydroxide was used as the base.
In this example, the anaerobic fermentation temperature was 45 ℃ and the time was 8 days.
In this example, the dissolved oxygen concentration in the excess sludge during the anaerobic fermentation was 0.1 mg/L.
Example two:
a novel water treatment process for sludge synergism comprises the following steps:
A. firstly, putting sludge into a domestic sewage treatment plant for treatment to obtain first-stage sludge;
B. and (4) retreating the sludge in the first stage to obtain the sludge in the second stage.
In this embodiment, in the step a, the sludge is mechanically dewatered, specifically, the sludge is dewatered by a sludge dewatering machine.
In this example, the first stage sludge reprocessing method in step B is as follows:
a. firstly, putting the sludge of the first stage into a stirring tank, putting a treating agent into the stirring tank, and fully stirring and mixing the treating agent and the sludge of the first stage to obtain a sludge mixture;
b. then the sludge mixture is put into an anaerobic fermentation tank for anaerobic fermentation.
In this embodiment, the treating agent in step a includes, by weight, 20 parts of polyacrylamide, 20 parts of polyaluminum ferric chloride, 10 parts of aluminum nitrate, 15 parts of ferric sulfate, 10 parts of fluorite, 9 parts of kaolin, 12 parts of tetrabutylammonium iodide, and 20 parts of active diatomite.
In this example, the anaerobic fermentation method in step b is as follows: adding alkali into the sludge, stirring, and adjusting and maintaining the pH value of the residual sludge to be 10, wherein the stirring speed is 12000 r/min, and the stirring time is 3 h.
In this example, potassium hydroxide was used as the base.
In this example, the anaerobic fermentation temperature was 55 ℃ for 10 days.
In this example, the dissolved oxygen concentration in the excess sludge during the anaerobic fermentation was 0.2 mg/L.
Example three:
a novel water treatment process for sludge synergism comprises the following steps:
A. firstly, putting sludge into a domestic sewage treatment plant for treatment to obtain first-stage sludge;
B. and (4) retreating the sludge in the first stage to obtain the sludge in the second stage.
In this embodiment, in the step a, the sludge is mechanically dewatered, specifically, the sludge is dewatered by a sludge dewatering machine.
In this example, the first stage sludge reprocessing method in step B is as follows:
a. firstly, putting the sludge of the first stage into a stirring tank, putting a treating agent into the stirring tank, and fully stirring and mixing the treating agent and the sludge of the first stage to obtain a sludge mixture;
b. then the sludge mixture is put into an anaerobic fermentation tank for anaerobic fermentation.
In this embodiment, the treating agent in step a includes, by weight, 12 parts of polyacrylamide, 10 parts of polyaluminum ferric chloride, 5 parts of aluminum nitrate, 7 parts of ferric sulfate, 7 parts of fluorite, 4 parts of kaolin, 7 parts of tetrabutylammonium iodide, and 12 parts of active diatomite.
In this example, the anaerobic fermentation method in step b is as follows: adding alkali into the sludge, stirring, and adjusting and maintaining the pH value of the residual sludge to be 9, wherein the stirring speed is 9000 r/min, and the stirring time is 2 hours.
In this example, a mixture of sodium hydroxide and potassium hydroxide was used as the base.
In this example, the anaerobic fermentation temperature was 48 ℃ for 9 days.
In this example, the dissolved oxygen concentration in the excess sludge during the anaerobic fermentation was 0.12 mg/L.
Example four:
a novel water treatment process for sludge synergism comprises the following steps:
A. firstly, putting sludge into a domestic sewage treatment plant for treatment to obtain first-stage sludge;
B. and (4) retreating the sludge in the first stage to obtain the sludge in the second stage.
In this embodiment, in the step a, the sludge is mechanically dewatered, specifically, the sludge is dewatered by a sludge dewatering machine.
In this example, the first stage sludge reprocessing method in step B is as follows:
a. firstly, putting the sludge of the first stage into a stirring tank, putting a treating agent into the stirring tank, and fully stirring and mixing the treating agent and the sludge of the first stage to obtain a sludge mixture;
b. then the sludge mixture is put into an anaerobic fermentation tank for anaerobic fermentation.
In this embodiment, the treating agent in step a includes, by weight, 18 parts of polyacrylamide, 18 parts of polyaluminum ferric chloride, 8 parts of aluminum nitrate, 12 parts of ferric sulfate, 8 parts of fluorite, 8 parts of kaolin, 10 parts of tetrabutylammonium iodide, and 18 parts of active diatomite.
In this example, the anaerobic fermentation method in step b is as follows: adding alkali into the sludge, stirring, and adjusting and maintaining the pH value of the residual sludge to be 10, wherein the stirring speed is 11000 r/min, and the stirring time is 3 h.
In this example, the alkali is a mixture of potassium hydroxide and calcium hydroxide.
In this example, the anaerobic fermentation temperature was 52 ℃ for 10 days.
In this example, the dissolved oxygen concentration in the excess sludge during the anaerobic fermentation was 0.2 mg/L.
Example five:
a novel water treatment process for sludge synergism comprises the following steps:
A. firstly, putting sludge into a domestic sewage treatment plant for treatment to obtain first-stage sludge;
B. and (4) retreating the sludge in the first stage to obtain the sludge in the second stage.
In this embodiment, in the step a, the sludge is mechanically dewatered, specifically, the sludge is dewatered by a sludge dewatering machine.
In this example, the first stage sludge reprocessing method in step B is as follows:
a. firstly, putting the sludge of the first stage into a stirring tank, putting a treating agent into the stirring tank, and fully stirring and mixing the treating agent and the sludge of the first stage to obtain a sludge mixture;
b. then the sludge mixture is put into an anaerobic fermentation tank for anaerobic fermentation.
In this embodiment, the treating agent in step a includes, by weight, 15 parts of polyacrylamide, 14 parts of polyaluminum ferric chloride, 7 parts of aluminum nitrate, 10 parts of ferric sulfate, 7 parts of fluorite, 6 parts of kaolin, 9 parts of tetrabutylammonium iodide, and 15 parts of active diatomite.
In this example, the anaerobic fermentation method in step b is as follows: adding alkali into the sludge, stirring, adjusting and maintaining the pH value of the residual sludge to be 9, wherein the stirring speed is 10000 r/min, and the stirring time is 3 h.
In this example, the alkali is a mixture of sodium hydroxide, potassium hydroxide and calcium hydroxide.
In this example, the anaerobic fermentation temperature was 50 ℃ for 9 days.
In this example, the dissolved oxygen concentration in the excess sludge during the anaerobic fermentation was 0.15 mg/L.
The sludge treated by the domestic sewage treatment plant is put into an industrial sewage treatment plant (the design daily treated water amount is 4 thousands of cubes), and the part of sludge is continuously digested in the industrial sewage treatment plant, so that the sludge reduction is realized. According to practice, the absolute dry quantity of sludge with the water content of about 80% fed by a domestic sewage treatment plant all the year around is A tons, the absolute dry quantity of sludge with the water content of below 60% produced by the industrial sewage treatment plant all the year around is B tons, and practical data show that A and B are both more than 2100 tons, the absolute value of the difference value between A and B is less than 5 tons, and the difference value can be ignored. When the domestic sewage treatment plant does not throw sludge to the industrial sewage treatment plant, the industrial sewage treatment plant actually produces C tons of sludge all the year round (wherein C = year water treatment amount: ten thousand tons of aquatic product absolutely dry sludge). Therefore, the sludge reduction of the whole year is C tons, and the actual C value is kiloton grade.
In conclusion, the invention not only optimizes the process of the biochemical system of the industrial sewage treatment plant, but also saves two large costs, namely the disposal cost of the sludge reduction part; and the technical cost is intermediate between the treatment of the water content of the sludge in the domestic sewage treatment plant to below 60 percent and the treatment to about 80 percent. The combination of sludge synergism and water treatment process is really realized.
In conclusion, the water treatment process adopted by the invention is simple to operate, the sludge treated by the domestic sewage treatment plant contains rich organic matters, nitrogen, phosphorus and other nutrient elements, and the sludge is put into a biochemical system of the industrial sewage treatment plant, so that the B/C ratio is improved, the C, N, P and other nutrient elements are supplemented, the problem that the growth and the propagation of microorganisms are not facilitated due to low water inlet nutrient substances is solved, and the biochemical property of the biological treatment system is improved. Also solves the problem of slow increment of the concentration of the activated sludge, and is convenient for popularization and use.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A novel water treatment process for sludge synergism is characterized in that: the method comprises the following steps:
A. firstly, putting sludge into a domestic sewage treatment plant for treatment to obtain first-stage sludge;
B. and (4) retreating the sludge in the first stage to obtain the sludge in the second stage.
2. The novel water treatment process related to sludge synergism of claim 1, characterized in that: and in the step A, the sludge is subjected to mechanical dehydration treatment in a mechanical dehydration mode, and specifically, the sludge is subjected to dehydration treatment by a sludge dehydrator.
3. The novel water treatment process related to sludge synergism of claim 1, characterized in that: the first-stage sludge retreatment method in the step B comprises the following steps:
a. firstly, putting the sludge of the first stage into a stirring tank, putting a treating agent into the stirring tank, and fully stirring and mixing the treating agent and the sludge of the first stage to obtain a sludge mixture;
b. then the sludge mixture is put into an anaerobic fermentation tank for anaerobic fermentation.
4. The novel water treatment process related to sludge synergism of claim 3, characterized in that: the treating agent in the step a comprises, by weight, 10-20 parts of polyacrylamide, 8-20 parts of polyaluminum ferric chloride, 4-10 parts of aluminum nitrate, 5-15 parts of ferric sulfate, 4-10 parts of fluorite, 3-9 parts of kaolin, 6-12 parts of tetrabutylammonium iodide and 10-20 parts of active diatomite.
5. The novel water treatment process related to sludge synergism of claim 3, characterized in that: the anaerobic fermentation method in the step b is as follows: adding alkali into the sludge, stirring, and adjusting and maintaining the pH value of the residual sludge to be 9-10, wherein the stirring speed is 8000-.
6. The novel water treatment process related to sludge synergism of claim 5, characterized in that: the alkali is one or more of sodium hydroxide, potassium hydroxide or calcium hydroxide.
7. The novel water treatment process related to sludge synergism of claim 5, characterized in that: the anaerobic fermentation temperature is 45-55 deg.C, and the time is 8-10 days.
8. The novel water treatment process related to sludge synergism of claim 5, characterized in that: the concentration of dissolved oxygen in the residual sludge in the anaerobic fermentation process is 0.1-0.2 mg/L.
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2021
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Application publication date: 20210706 |