CN111333295A - Electrochemical process method for promoting deep dehydration of sludge - Google Patents
Electrochemical process method for promoting deep dehydration of sludge Download PDFInfo
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- CN111333295A CN111333295A CN202010102983.5A CN202010102983A CN111333295A CN 111333295 A CN111333295 A CN 111333295A CN 202010102983 A CN202010102983 A CN 202010102983A CN 111333295 A CN111333295 A CN 111333295A
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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
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
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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
- C02F11/121—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
-
- 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
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- 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
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses an electrochemical process method for promoting deep dehydration of sludge, which comprises the following specific steps: municipal administration mud is transported to the concentrated pond through the mud induction pipe, and the mud after the concentrated pond filters through the filter, then carries out electrochemical treatment in pumping to electrochemical device through the screw rod, handles the back through the electrochemistry broken wall, and mud carries out dehydration through dewatering equipment, obtains the dry sludge of low moisture content, further reduces the mud volume, transports dry sludge to incineration plant and handles. The invention adopts an electrochemical treatment process, improves the dehydration performance of the sludge and improves the dehydration efficiency in the subsequent sludge dehydration stage.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and relates to an electrochemical process method for promoting deep dehydration of sludge.
Background
Since the birth of 1914, the active sludge method water treatment process has become the most widely applied technology of the current sewage treatment plant after the continuous improvement of hundreds of years, the process removes biochemically degradable organic matters and various toxic and harmful substances in the sewage through the metabolism of microorganisms, but the microorganisms propagate continuously while purifying the water, so the process has the big disadvantage that a large amount of residual sludge can be generated. The residual sludge usually has high water content (more than 99 percent) and poor dehydration performance, so the treatment cost is high and accounts for about 20 to 50 percent of the total operation cost of the sewage plant. Therefore, it is highly desirable to improve the dehydration performance of excess sludge and reduce the water content thereof by reasonable means so as to facilitate the transportation and treatment of the subsequent sludge.
The traditional sludge treatment process flow mainly comprises three parts of sludge concentration, dehydration and landfill. However, with the problems of upgrading and reconstruction of urban sewage plants, shortage of land resources and the like, the landfill mode cannot meet the requirement of rapid increase of the existing sludge. National sludge production will break through 6000 million tons/year in 2020, so the final disposal of sludge must be changed from landfill to incineration. In the traditional method, the water content of the sludge is still high, namely about 80-85% after concentration and filter pressing, and the sludge is treated in an incineration mode, so that huge expense is generated, the operation cost of a sewage plant is greatly increased, and therefore, the sludge needs to be pretreated to improve the dehydration performance so as to further improve the deep dehydration efficiency of the sludge.
In recent years, the power industry is vigorous, the electrochemical technology gradually draws attention of people, and the electrochemical technology has the advantages of cleanness, high efficiency, simple operation, mild reaction conditions, economy, energy conservation and the like. The sludge dewatering technology based on the technology is reported for many times, and the principle is that various active free radicals with strong oxidizing property are generated in the electrochemical process to destroy the sludge floc structure, oxidize and decompose Extracellular Polymers (EPS) and release free water and intracellular substances, so that the dewatering performance of the sludge is improved. After the residual sludge is subjected to electrochemical treatment, the efficiency of subsequent dehydration treatment can be improved. Therefore, the electrochemistry is used as a conditioning link in the sludge treatment process, and the cost of sludge treatment and disposal of the sewage plant can be obviously reduced.
Disclosure of Invention
The invention aims to provide an electrochemical process method for promoting deep dehydration of sludge, which adopts an electrochemical treatment process, improves the dehydration performance of the sludge and improves the dehydration efficiency in the subsequent sludge dehydration stage.
The invention adopts the technical scheme that an electrochemical process method for promoting deep dehydration of sludge comprises the following specific processes: municipal administration mud is transported to the concentrated pond through the mud induction pipe, and the mud after the concentrated pond filters through the filter, then carries out electrochemical treatment in pumping to electrochemical device through the screw rod, handles the back through the electrochemistry broken wall, and mud carries out dehydration through dewatering equipment, obtains the dry sludge of low moisture content, further reduces the mud volume, transports dry sludge to incineration plant and handles.
The present invention is also characterized in that,
the concentration range of the sludge after being concentrated by the concentration tank is 10000 mg/L-12000 mg/L.
The filtering aperture of the filter screen in the filter is 1 mm-2 mm.
The anode material in the electrochemical device adopts DSA electrode, the cathode is made of stainless steel material, and the current density range is 5mA/cm2～100mA/cm2The treatment time of the electrochemical device is 60-180 min, the pH range of the sludge is 5-9, and the treatment temperature is 25-50 ℃.
After the sludge is dehydrated by the dehydration equipment, the water content of the sludge is 60-75%.
The dewatering equipment adopts one of a belt filter press, a plate-and-frame filter press and a high-speed centrifuge.
The invention has the following beneficial effects: the sludge electrochemical treatment process disclosed by the invention is an embedded process, does not need civil engineering, can be used together with various sludge treatment processes, the sludge dewatering performance is improved by 20-30% after the sludge is subjected to electrochemical treatment, the water content of the sludge is reduced to 60-75% after the sludge subjected to electrochemical treatment is subjected to pressure filtration by a dewatering device, the total volume of the sludge is greatly reduced, the treatment cost of subsequent sludge transportation and incineration is reduced, and the operation cost of sludge treatment in a sewage plant is reduced.
Drawings
FIG. 1 is a schematic process flow diagram of an electrochemical process for deep dewatering of sludge according to the present invention;
FIG. 2 is a schematic diagram of Ti/PbO in the electrochemical process for deep dehydration of sludge according to the invention2A trend graph of capillary water absorption time along with time after sludge is treated by the electrode;
FIG. 3 shows Ti/Sb-SnO in the electrochemical process for deep dehydration of sludge according to the invention2And (3) a trend graph of capillary water absorption time along with time after sludge is treated by the electrode.
In the figure, 1 is a sludge inlet pipe, 2 is a concentration tank, 3 is a filter, 4 is an electrochemical device, 5 is a dewatering device, and 6 is a screw pump.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to an electrochemical process method for promoting deep dehydration of sludge, which comprises the following specific steps:
as shown in figure 1, municipal sludge is conveyed to a concentration tank 2 through a sludge inlet pipe 1 for gravity concentration, the sludge concentrated by the concentration tank 2 is filtered by a filter 3, then pumped to an electrochemical device 4 through a screw pump 6 for electrochemical treatment, and is dewatered by dewatering equipment 5 after the electrochemical wall breaking treatment, so that dry sludge with low water content is obtained, the volume of the sludge is further reduced, and the dry sludge is conveyed to an incineration plant for treatment.
The concentration range of the sludge after the sludge is concentrated by the concentration tank 2 is 10000 mg/L-12000 mg/L.
The filtering aperture of the filter screen in the filter 3 is 1 mm-2 mm.
The anode material in the electrochemical device 4 adopts DSA electrode, the cathode is made of stainless steel material, and the current density range is 5mA/cm2～100mA/cm2The treatment time of the electrochemical device 4 is 60-180 min, the pH range of the sludge is 5-9, and the treatment temperature is 25-50 ℃. The DSA electrode is electrified by low-voltage direct current or pulse electricity, generates a large amount of hydroxyl radicals with strong oxidizing property in electrochemical reaction,the sludge flocs are damaged, the wall breaking effect on sludge cells is strong, and after the sludge is treated in an electrochemical reaction device for 60-180 min, a large amount of intracellular substances are released, so that the dehydration property of the sludge is improved by 20-30%. The sludge after the electrochemical wall breaking treatment is dehydrated by a dehydrating device 5, and the water content of the dehydrated sludge can be reduced to 60-75%.
Example 1
FIG. 2 shows the use of Ti/PbO2The electrode is used as an electrochemical anode material to pretreat the sludge, and then the capillary water absorption time changes with time when the external applied voltage is 50mA/cm2When the pH is 7.5 and the electrolysis time is 180min, the capillary water absorption time is reduced from the initial 13.4s to 9.4s after the sludge is subjected to electrochemical treatment, and the dehydration effect is improved by 30%.
Example 2
FIG. 3 shows the use of Ti/Sb-SnO2The electrode is used as an electrochemical anode material to pretreat the sludge, and then the capillary water absorption time changes with time when the current density is 30mA/cm2When the pH is 8.3 and the electrolysis time is 180min, the capillary water absorption time of the sludge after electrochemical treatment is reduced from the initial 13.9s to 10.59s, and the dehydration effect is improved by 24%.
Example 3
With Ti/RuO2The electrode is used as an electrochemical anode material and has a current density of 60mA/cm2The pH value is 8.5, the electrolysis time is 120min, the mechanical dehydration treatment is carried out on the sludge subjected to the electrochemical pretreatment by adopting a plate-and-frame filter press, the water content of the sludge is 65%, and the water content is reduced by 15% compared with the water content (80%) of the sludge subjected to direct filter pressing without the electrochemical treatment.
The electrochemical process method for promoting the deep dehydration of the sludge has the characteristics of improving the dehydration performance of the sludge, realizing the deep dehydration of the sludge, reducing the total volume of the sludge and reducing the treatment cost of final sludge incineration. The electrochemical process does not need civil engineering and secondary additive pollution, and has great prospect for sludge treatment under the current situation that the sludge is a main predicament of a sewage plant.
Claims (6)
1. An electrochemical process method for promoting deep dehydration of sludge is characterized by comprising the following specific steps: municipal administration mud is transported to the concentrated pond through the mud induction pipe, and the mud after the concentrated pond filters through the filter, then carries out electrochemical treatment in pumping to electrochemical device through the screw rod, handles the back through the electrochemistry broken wall, and mud carries out dehydration through dewatering equipment, obtains the dry sludge of low moisture content, further reduces the mud volume, transports dry sludge to incineration plant and handles.
2. The electrochemical process method for promoting the deep dehydration of sludge as claimed in claim 1, wherein the concentration range of the sludge after being concentrated by the concentration tank is 10000mg/L to 12000 mg/L.
3. The electrochemical process method for promoting the deep dehydration of sludge as claimed in claim 1, wherein the filtering aperture of the filter screen is 1 mm-2 mm.
4. The electrochemical process method for promoting sludge deep dehydration as claimed in claim 1, characterized in that the anode material in the electrochemical device is DSA electrode, the cathode is stainless steel material, and the current density range is 5mA/cm2～100mA/cm2The treatment time of the electrochemical device is 60-180 min, the pH range of the sludge is 5-9, and the treatment temperature is 25-50 ℃.
5. The electrochemical process method for promoting the deep dehydration of sludge as claimed in claim 4, wherein the dehydration equipment dehydrates the sludge to have a water content of 60-75%.
6. The electrochemical process method for promoting the deep dehydration of sludge as claimed in claim 1, wherein said dehydration equipment is one of a belt filter press, a plate and frame filter press and a high speed centrifuge.
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| CN202010102983.5A CN111333295A (en) | 2020-02-19 | 2020-02-19 | Electrochemical process method for promoting deep dehydration of sludge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112250277A (en) * | 2020-12-23 | 2021-01-22 | 湖南碳谷装备制造有限公司 | Sludge dewatering method and system based on microwave electrolytic catalytic oxidation |
| CN113698068A (en) * | 2021-09-01 | 2021-11-26 | 广西民族大学 | Method for circularly conditioning and dehydrating sludge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112250277A (en) * | 2020-12-23 | 2021-01-22 | 湖南碳谷装备制造有限公司 | Sludge dewatering method and system based on microwave electrolytic catalytic oxidation |
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| CN113698068A (en) * | 2021-09-01 | 2021-11-26 | 广西民族大学 | Method for circularly conditioning and dehydrating sludge |
| CN113698068B (en) * | 2021-09-01 | 2023-08-22 | 广西民族大学 | Sludge circulation conditioning and dewatering method |
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