CN116332464A - Biochemical sludge treatment method - Google Patents
Biochemical sludge treatment method Download PDFInfo
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- CN116332464A CN116332464A CN202310429126.XA CN202310429126A CN116332464A CN 116332464 A CN116332464 A CN 116332464A CN 202310429126 A CN202310429126 A CN 202310429126A CN 116332464 A CN116332464 A CN 116332464A
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- biochemical sludge
- treatment method
- sludge treatment
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- pressing
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0027—Condensation of vapours; Recovering volatile solvents by condensation by direct contact between vapours or gases and the cooling medium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of environmental protection, and discloses a biochemical sludge treatment method. The biochemical sludge treatment method comprises the following steps: (1) Pressing biochemical sludge by a plate pressing machine to obtain a mud plate; (2) Evaporating the mud board in the step (1) by adopting a low-temperature evaporator; (3) The gas obtained after the evaporation treatment in the step (2) is treated by a precooler and a deep cooler in sequence; (4) And (3) adsorbing the gas subjected to the condensation treatment in the step (3) by using activated carbon, and discharging the purified gas. The treatment method can realize good treatment of the biochemical sludge containing the organic solvent, and has the advantages of safety, high efficiency and low cost.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a biochemical sludge treatment method.
Background
In the existing process water treatment process, activated sludge is often adopted to carry out biochemical treatment on process water, and soil (biochemical sludge) in a treatment tank is required to be replaced and treated at intervals due to the survival and adaptation problems of bacterial groups in the process water so as to ensure the activity of bacteria. However, in the preparation of industrial chemicals, organic solvents are often used to assist in the reaction, so that the process water produced in the production process also contains organic solvents, which in turn results in the biochemical sludge also containing organic solvents. If the biochemical sludge is subjected to reduction treatment by adopting a conventional heating evaporation mode, the organic solvent contained in the biochemical sludge has the risks of combustion and explosion, and potential safety hazards exist.
Therefore, the invention is expected to provide a safe, efficient and low-cost biochemical sludge treatment method so as to meet the treatment requirements of the biochemical sludge containing the organic solvent.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the prior art described above. Therefore, the invention provides a biochemical sludge treatment method which can realize good treatment of biochemical sludge containing organic solvent and has the advantages of safety, high efficiency and low cost.
The invention provides a biochemical sludge treatment method, which comprises the following steps:
(1) Pressing biochemical sludge by a plate pressing machine to obtain a mud plate;
(2) Evaporating the mud board in the step (1) by adopting a low-temperature evaporator;
(3) The gas obtained after the evaporation treatment in the step (2) is treated by a precooler and a deep cooler in sequence;
(4) And (3) adsorbing the gas subjected to the condensation treatment in the step (3) by using activated carbon, and discharging the purified gas.
Wherein, through the condensation treatment of the precooler and the cryocooler in the step (3), the organic solvent and water contained in the gas can be effectively condensed into a liquid state for collection and treatment. The adsorption treatment in step (4) may remove VOCs (volatile organic compounds) contained in the gas to prevent pollution of the environment by the discharged gas.
Preferably, in the step (1), the biochemical sludge is conveyed to a plate pressing machine by adopting a pneumatic pump for pressing.
Preferably, the pressure of the pressing in step (1) is controlled to be 0.1-1MPa. The pressing pressure is the pressure of the filter cloth part of the pressing machine.
Preferably, the pressing time in step (1) is controlled to 15-30 hours.
Preferably, in the step (2), the mud board is crushed by using a stirrer. The surface area of the sludge can be enlarged by smashing by adopting the stirrer, so that the evaporation speed and effect are improved.
Preferably, the low temperature evaporator in step (2) is set at a temperature of 35-45 ℃.
Preferably, the evaporation treatment in step (2) further comprises a vacuum pumping operation. The boiling point of the solvent in the sludge can be reduced by the negative pressure effect formed by vacuumizing, so that good evaporation and separation of the solvent can be realized in a low-temperature state.
Preferably, in the step (3), the condensing medium in the precooler is chilled water, and the condensing medium in the cryocooler is ethylene glycol.
Preferably, the cooling temperature of the precooler in step (3) is 5-12 ℃.
Preferably, the cooling temperature of the cryocooler in step (3) is from-10 to-20 ℃.
Preferably, the step (4) further comprises an operation of desorbing and regenerating the activated carbon. When the activated carbon adsorption reaches saturation, the saturated activated carbon can be desorbed and regenerated, so that the activated carbon can be regenerated and utilized, and the cost is reduced.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the low-temperature evaporation technology to treat the biochemical sludge, thereby avoiding the risks of burning and explosion of the organic solvent in the biochemical sludge; in addition, the evaporation temperature of low-temperature evaporation is low, so that the steam used in a factory can be utilized for secondary utilization, and compared with common steam, the cascade utilization of energy can be realized, and the purpose of energy conservation is achieved.
2. The invention also carries out condensation treatment on the gas obtained after low-temperature evaporation by combining precooling and cryogenic technology, and can effectively separate the organic solvent and water vapor carried out by the gas.
Drawings
FIG. 1 is a schematic flow chart of a biochemical sludge treatment method according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples will be presented. It should be noted that the following embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited to the following embodiments, and any modifications, substitutions, and combinations made without departing from the spirit and principles of the present invention are included in the scope of the present invention.
The starting materials, reagents or apparatus used in the following examples are all available from conventional commercial sources or may be obtained by methods known in the art unless otherwise specified.
It is known that the process water produced in the process of producing acrylic ester contains organic solvents such as toluene and cyclohexane, and the biochemical sludge formed after the treatment also contains the organic solvents. The embodiment provides a treatment method of biochemical sludge, so as to achieve the purposes of high-efficiency, environment-friendly and low-cost treatment of the biochemical sludge and similar biochemical sludge. The flow chart of the treatment method is shown in fig. 1, and specifically comprises the following steps:
(1) The biochemical sludge (namely sludge water) in the bottom of each treatment tank of the sewage station is pumped into a plate pressing machine (model XMYJ 60/800-UB) by a pneumatic pump, the pressing pressure is controlled to be 0.8MPa (filter cloth part) for 20h, and most of the water in the sludge water is pressed out under the action of the plate pressing machine to form a mud board (the water content of the mud board is about 20%). And the water produced by pressing is filtered by filter cloth outside the pressing plate machine and flows into a sewage station mixing pool.
(2) The mud plate is taken out and put into a low-temperature evaporator (FEV-400S), a stirrer is further arranged in the low-temperature evaporator, and the mud plate is smashed by starting the stirrer (the rotating speed is set to be 80 r/min), so that the surface area of the mud is increased, and the evaporation and dehydration operation in the low-temperature evaporator is facilitated. Firstly, the heating temperature of a low-temperature evaporator is adjusted to 35 ℃, and vacuum pumping is started to enable the boiling point of a solvent (organic solvent and water) in the sludge to be reduced under the action of vacuum negative pressure, and the solvent is separated from the sludge under the action of low-temperature evaporation. After most of the solvent is separated, the negative pressure state is broken, the heating temperature is increased to 45 ℃, dry air is introduced, the dry air is fully contacted with the sludge, and the dry air reaches a saturated state and becomes wet air in the contact process, so that the purpose of reducing the weight is achieved. After low-temperature evaporation treatment, the water content of the sludge can be reduced to 5%. During condensation and evaporation, the rotation speed of the evaporator stirrer, the temperature of the evaporator and the flow rate of air can be adjusted according to the specific state of sludge and the humidity value of the air outlet so as to improve the dehydration efficiency of the low-temperature evaporator.
One of the advantages of low-temperature evaporation is that the evaporation temperature is low (lower than 50 ℃), the temperature can be utilized for secondary utilization by utilizing the steam used in the factory, and compared with common steam, the energy can be utilized in a gradient manner, so that the energy saving purpose is achieved. In addition, because the temperature of low-temperature evaporation is lower, the risk of burning and explosion of the organic solvent can be avoided, and the biochemical sludge treatment is safer and more reliable.
(3) The gas obtained after the low-temperature evaporation treatment is firstly added into a precooler (precooling temperature is about 12 ℃) which takes chilled water as a condensing medium, so that the solvent and water vapor in the gas are condensed and collected into a buffer tank A. After the gas passes through a pre-cooling stage, the gas enters a cryocooler (the cryogenic temperature is about-15 ℃) taking ethylene glycol as a condensing medium, the solvent and the water vapor in the gas are further condensed and enter a buffer tank B, and the condensed solvent and the condensed water vapor in the buffer tank A/B are pumped into a high-concentration water tank.
The gas obtained after the low-temperature evaporation treatment contains various hydrocarbon and non-hydrocarbon organic matters with different molecular sizes and chemical structures. The condensation is divided into a pre-cooling stage and a deep cooling stage, wherein chilled water is adopted as a condensing medium in the pre-cooling stage to cool hot gas; in the cryogenic stage, glycol is used as a condensing medium to further cool the gas, so that partial solvent and vapor carried by the gas are separated.
(4) Passing the gas condensed in the step (3) through an active carbon tank to make the gas in the airVOC (volatile organic compounds) are captured and adsorbed. The activated carbon tank is divided into an A/B tank for alternative use, for example, when the activated carbon tank A is adsorbed to a limit, the activated carbon tank B is switched to be adsorbed, and the activated carbon tank A is subjected to activated carbon desorption treatment, and the desorption is heated by utilizing steam. The purified gas is discharged to the atmosphere. The total non-methane hydrocarbon value in the gas discharged to the atmosphere is 5mg/m 3 Below 6mg/m 3 Is a concentration limit of (c).
While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A biochemical sludge treatment method, which is characterized by comprising the following steps:
(1) Pressing biochemical sludge by a plate pressing machine to obtain a mud plate;
(2) Evaporating the mud board in the step (1) by adopting a low-temperature evaporator;
(3) Condensing the gas obtained after the evaporation treatment in the step (2) through a precooler and a cryocooler in sequence;
(4) And (3) adsorbing the gas subjected to the condensation treatment in the step (3) by using activated carbon, and discharging the purified gas.
2. The biochemical sludge treatment method according to claim 1, wherein the biochemical sludge is transported to a plate press for pressing by a pneumatic pump in the step (1).
3. The biochemical sludge treatment method according to claim 1, wherein the pressure of the pressing in the step (1) is controlled to be 0.1 to 1MPa.
4. The biochemical sludge treatment method according to claim 1, wherein the pressing time in the step (1) is controlled to 15 to 30 hours.
5. The biochemical sludge treatment method according to claim 1, wherein the mud plate is broken up by using a stirrer in the step (2).
6. The biochemical sludge treatment method according to claim 1, wherein the low-temperature evaporator in the step (2) is set at a temperature of 35 to 45 ℃.
7. The biochemical sludge treatment method according to claim 1, wherein the evaporation treatment in the step (2) further comprises an operation of evacuating.
8. The biochemical sludge treatment method according to claim 1, wherein the condensing medium in the precooler in the step (3) is chilled water, and the condensing medium in the deep cooler is ethylene glycol.
9. The biochemical sludge treatment method according to claim 1, wherein the cooling temperature of the precooler in step (3) is 5 to 12 ℃ and the cooling temperature of the deep cooler is-10 to-20 ℃.
10. The biochemical sludge treatment method according to claim 1, wherein the step (4) further comprises an operation of desorbing and regenerating the activated carbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310429126.XA CN116332464A (en) | 2023-04-20 | 2023-04-20 | Biochemical sludge treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310429126.XA CN116332464A (en) | 2023-04-20 | 2023-04-20 | Biochemical sludge treatment method |
Publications (1)
| Publication Number | Publication Date |
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| CN116332464A true CN116332464A (en) | 2023-06-27 |
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| CN202310429126.XA Pending CN116332464A (en) | 2023-04-20 | 2023-04-20 | Biochemical sludge treatment method |
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| CN (1) | CN116332464A (en) |
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2023
- 2023-04-20 CN CN202310429126.XA patent/CN116332464A/en active Pending
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