CN115626752A - Method for reinforced separation and extraction of sludge micro-plastic - Google Patents
Method for reinforced separation and extraction of sludge micro-plastic Download PDFInfo
- Publication number
- CN115626752A CN115626752A CN202211406131.0A CN202211406131A CN115626752A CN 115626752 A CN115626752 A CN 115626752A CN 202211406131 A CN202211406131 A CN 202211406131A CN 115626752 A CN115626752 A CN 115626752A
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- Prior art keywords
- sludge
- micro
- extraction
- tubular reactor
- sludge mixed
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- 239000010802 sludge Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000605 extraction Methods 0.000 title claims abstract description 16
- 229920003023 plastic Polymers 0.000 title claims abstract description 15
- 239000004033 plastic Substances 0.000 title claims abstract description 15
- 238000000926 separation method Methods 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 229920000426 Microplastic Polymers 0.000 claims abstract description 11
- 239000010865 sewage Substances 0.000 claims abstract description 11
- 238000005728 strengthening Methods 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- 239000010453 quartz Substances 0.000 claims description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 5
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 description 7
- 230000006378 damage Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000001580 bacterial effect Effects 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 102000003855 L-lactate dehydrogenase Human genes 0.000 description 2
- 108700023483 L-lactate dehydrogenases Proteins 0.000 description 2
- 230000006037 cell lysis Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000003411 electrode reaction Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for strengthening separation and extraction of sludge micro-plastic, which comprises the following steps of (1) sludge collection: collecting sludge mixed liquor formed after sewage treatment by using a container, and storing the collected sludge mixed liquor in an environment at 4 ℃; (2) Taking out the sludge mixed liquor stored in the step (1), fully mixing uniformly and recovering to normal temperature; (3) Putting the sludge mixed liquor recovered to the normal temperature in the step (2) into the discharge plasma device, (4) carrying out high-voltage discharge on the sludge mixed liquor through a high-voltage output end of a power supply system (4), and simultaneously introducing air into the sludge mixed liquor through an air pump (9); (5) The micro plastic floating on the upper part of the sludge mixed liquid is collected, so that the micro plastic in the sludge can be better collected.
Description
Technical Field
The invention relates to the field of extraction of sludge micro-plastics, in particular to a method for strengthening separation and extraction of sludge micro-plastics.
Background
The sewage treatment plant can treat a large amount of sewage every day, a large amount of sludge is usually formed during sewage treatment, the sludge usually contains micro plastics, the micro plastics can be usually recycled, but the micro plastics in the sludge after sewage treatment are firmly combined with the sludge and are not easy to separate, so that a method for strengthening separation and extraction of sludge micro plastics is urgently needed.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide a method for strengthening separation and extraction of sludge micro-plastics.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a method for strengthening separation and extraction of sludge micro-plastic, which comprises the following steps:
(1) Sludge collection: collecting sludge mixed liquor formed after sewage treatment by using a container, and storing the collected sludge mixed liquor in an environment at 4 ℃;
(2) Taking out the sludge mixed liquor stored in the step (1), fully mixing uniformly and recovering to normal temperature;
(3) Putting the sludge mixed liquid recovered to the normal temperature in the step (2) into a discharge plasma device, wherein the discharge plasma device comprises a tubular reactor, a high-voltage electrode and an earth electrode, the high-voltage electrode extends into the tubular reactor, the top end of the high-voltage electrode is connected with the high-voltage output end of a power supply system through a high-voltage cable, the earth electrode is arranged at the bottom of the tubular reactor and is communicated with the interior of the tubular reactor, the earth electrode is connected with the grounding end of the power supply system through a cable, a quartz tube with a closed bottom end is fixed outside the high-voltage electrode, the upper ends of the high-voltage electrode and the quartz tube are fixed with the tubular reactor through a sealing plug, a plurality of air holes are formed in the side wall of the quartz tube close to the bottom end, the upper end of the quartz tube is communicated with an air pump through a dryer and an air inlet tube to form a sealed air inlet pipeline, a flow controller is arranged on the air inlet tube, and the high-voltage cable is connected with an oscilloscope;
(4) Carrying out high-voltage discharge on the sludge mixed liquor through a high-voltage output end of a power supply system, and introducing air into the sludge mixed liquor through an air pump;
(5) Collecting the micro plastic floating on the upper part of the sludge mixed liquid.
Preferably, the sewage treatment process in the step (1) is an A/A/O process.
Preferably, the normal temperature in step (2) is 25 ℃.
Preferably, in the step (3), the high-voltage electrode is a copper rod, a bacterial suspension which is in electrode reaction with a grounding electrode and a cable which is communicated with the bacterial suspension.
Preferably, the tubular reactor, the copper rod and the quartz tube in the step (3) are manufactured according to the following size proportion: the diameter of the tubular reactor is 40mm, and the height of the tubular reactor is 350mm; the radius of the copper rod is 2mm, and the length of the copper rod is 150mm; the diameter of the quartz tube is 8mm, and the thickness of the quartz tube is 1mm; the diameter of the air holes is 1mm.
Preferably, the number of the air holes is 3, and the 3 air holes are arranged at equal intervals.
Preferably, the dryer is a silica gel column.
The invention has the beneficial effects that:
the invention adopts the discharge plasma device to treat the sludge mixed liquid, OH, O2 and O3 generated by the discharge plasma in the discharge plasma device dominate the destruction of the sludge floc structure, the cell lysis of the microorganism and the conversion of extracellular polymer, so as to promote the release of a large amount of organic matters and combined water in the floc and the microorganism cell; under the action of the discharge plasma, the coliform bacteria are greatly reduced, and a large amount of lactate dehydrogenase is released; the proportion and composition of the tightly bound extracellular polymeric substance are reduced, while the dissolved extracellular polymeric substance is increased. Crushing large and complete sludge flocs into sludge fragments with smaller particle size; the destruction of sludge extracellular polymeric substances enables micro plastic particles to float upwards and be collected easily.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the structure of a discharge plasma apparatus according to the present invention;
FIG. 2 is a schematic diagram of the mechanism of sludge disintegration by discharge plasma according to the present invention;
in the figure:
1. a tubular reactor; 2. a high voltage electrode; 3. a ground electrode; 4. a power supply system; 5. a quartz tube; 501. air holes are formed; 6. a sealing plug; 7. a dryer; 8. an air inlet pipe; 9. an air pump; 10. a flow controller; 11. an oscilloscope.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
As shown in fig. 1: the embodiment provides a discharge plasma device, which includes a tubular reactor 1, a high voltage electrode 2 and an earth electrode 3, wherein the high voltage electrode 2 extends into the tubular reactor 1, the top end of the high voltage electrode 2 is connected with the high voltage output end of a power supply system 4 through a high voltage cable, the earth electrode 3 is arranged at the bottom of the tubular reactor 1 and is communicated with the inside of the tubular reactor 1, the earth electrode 3 is connected with the ground end of the power supply system 4 through a cable, a quartz tube sealing plug 5 with a closed bottom end is fixed outside the high voltage electrode 2, the upper ends of the high voltage electrode 2 and the quartz tube 5 are fixed with the tubular reactor 1 through a vent 6, a plurality of vent holes 501 are formed on the side wall of the quartz tube 5 near the bottom end, the upper end of the quartz tube 5 is communicated with an air pump 9 through a dryer 7 and an air inlet tube 8 to form a sealed air inlet pipeline, a flow controller 10 is arranged on the air inlet tube 8, and the high voltage cable is connected with an oscilloscope 11.
Preferably, the high-voltage electrode is a copper rod, a bacterial suspension liquid which is subjected to an electrode reaction on a ground electrode and a cable communicated with the copper rod, and the tubular reactor 1, the copper rod and the quartz tube 5 are manufactured according to the following size proportion: the diameter of the tubular reactor 1 is 40mm, and the height thereof is 350mm; the radius of the copper rod is 2mm, and the length of the copper rod is 150mm; the diameter of the quartz tube 5 is 8mm, and the thickness is 1mm; the diameter of the air holes 501 is 1mm. The number of the air holes 501 is 3, and the 3 air holes 501 are arranged at equal intervals.
The dryer 7 is a silica gel column, the power supply system 4 adopts a high-frequency high-voltage alternating-current power supply CTP-2000K, the discharge frequency is 7.0Hz, and the discharge voltage regulation range is 0-17kV.
The embodiment provides a method for strengthening separation and extraction of sludge micro-plastic, which comprises the following steps:
(1) Sludge collection: collecting sludge mixed liquor formed after sewage treatment by using a container, and storing the collected sludge mixed liquor in an environment at 4 ℃;
(2) Taking out the sludge mixed liquor stored in the step (1), fully mixing uniformly and recovering to normal temperature;
(3) Putting the sludge mixed solution recovered to the normal temperature in the step (2) into the discharge plasma device,
(4) The sludge mixed liquid is subjected to high-voltage discharge through a high-voltage output end of a power supply system (4), and air is introduced into the sludge mixed liquid through an air pump (9);
(5) Collecting the micro plastic floating on the upper part of the sludge mixed liquid.
In this example, the normal temperature was 25 ℃ and the sewage treatment process in step (1) was an A/A/O process.
The ground electrode 3, the flow controller 10, the air pump 9 and the oscilloscope 11 of the present embodiment are all made of existing products or structures known to those skilled in the art, and the specific model is determined according to actual conditions and is not described in detail herein.
The connection or arrangement of the tubular reactor 1, the high voltage electrode 2, the grounding electrode 3, the power supply system 4, the quartz tube 5, the air vent 501, the sealing plug 6, the dryer 7, the air inlet tube 8, the air pump 9, the flow controller 10 and the oscilloscope 11 in the embodiment is the existing connection or arrangement known to those skilled in the art, and will not be described in detail.
The flow controller 10 of the present embodiment is used for monitoring the flow rate of the air, and the oscilloscope 11 is used for monitoring the high-voltage output pulse, so as to know the discharge and ventilation conditions in time.
As shown in fig. 2, the active oxygen generated in the discharge plasma device can directly destroy the free microbial cells or permeate into the inside of the sludge flocs to attack the microbial cells wrapped in the flocs, so that a large amount of intracellular organic matters are released; on the other hand, the sludge breaking process is accompanied with the breaking of flocs and the redistribution of organic matters wrapped in the flocs, so that the internal extracellular polymers are continuously converted to the outside.
OH, O2 and O3 generated by the discharge plasma mainly cause the damage of a sludge floc structure, the cell lysis of microorganisms and the conversion of extracellular polymeric substances, so that organic matters and combined water in the floc and the microbial cells are greatly released; under the action of the discharge plasma, the coliform bacteria are greatly reduced, and a large amount of lactate dehydrogenase is released; the proportion and composition of the tightly bound extracellular polymeric substance are reduced, while the amount of the soluble extracellular polymeric substance is increased. Crushing large and complete sludge flocs into sludge fragments with smaller particle size; the destruction of sludge extracellular polymeric substances enables micro plastic particles to float upwards and be collected easily.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The method for strengthening separation and extraction of sludge micro-plastic is characterized by comprising the following steps:
(1) Sludge collection: collecting sludge mixed liquor formed after sewage treatment by using a container, and storing the collected sludge mixed liquor in an environment at 4 ℃;
(2) Taking out the sludge mixed liquor stored in the step (1), fully mixing uniformly and recovering to normal temperature;
(3) Putting the sludge mixed liquid recovered to the normal temperature in the step (2) into a discharge plasma device, wherein the discharge plasma device comprises a tubular reactor (1), a high-voltage electrode (2) and a grounding electrode (3), the high-voltage electrode (2) extends into the tubular reactor (1), the top end of the high-voltage electrode (2) is connected with a high-voltage output end of a power supply system (4) through a high-voltage cable, the grounding electrode (3) is arranged at the bottom of the tubular reactor (1) and is communicated with the interior of the tubular reactor (1), the grounding electrode (3) is connected with a grounding end of the power supply system (4) through a cable, a quartz tube (5) with a closed bottom end is fixed outside the high-voltage electrode (2), the upper ends of the high-voltage electrode (2) and the quartz tube (5) are fixed with the tubular reactor (1) through a sealing plug (6), a plurality of air holes (501) are formed in the side wall of the quartz tube (5) close to the bottom end, the upper end of the quartz tube (5) is communicated with an air pump (9) through a dryer (7) and an air inlet pipe (8) to form a sealed oscilloscope, and the high-pressure flow controller (10) is connected with a flow controller (10);
(4) The sludge mixed liquid is subjected to high-voltage discharge through a high-voltage output end of a power supply system (4), and air is introduced into the sludge mixed liquid through an air pump (9);
(5) Collecting the micro plastic floating on the upper part of the sludge mixed liquid.
2. The method for the enhanced separation and extraction of sludge micro-plastics as claimed in claim 1, wherein the sewage treatment process in step (1) is an A/A/O process.
3. The method for the enhanced separation and extraction of sludge micro-plastics as claimed in claim 1, wherein the normal temperature in the step (2) is 25 ℃.
4. The method for the enhanced separation and extraction of sludge micro-plastics as claimed in claim 1, wherein in step (3), the high voltage electrode is a copper rod, a ground electrode and a cable communicated with the copper rod and the ground electrode.
5. The method for the enhanced separation and extraction of sludge micro-plastic as claimed in claim 4, wherein the tubular reactor (1), the copper rod and the quartz tube (5) in the step (3) are manufactured according to the following size ratio: the diameter of the tubular reactor (1) is 40mm, and the height of the tubular reactor is 350mm; the radius of the copper rod is 2mm, and the length of the copper rod is 150mm; the diameter of the quartz tube (5) is 8mm, and the thickness is 1mm; the diameter of the air holes (501) is 1mm.
6. The method for the enhanced separation and extraction of sludge micro-plastics as claimed in claim 5, wherein the number of the air holes (501) is 3, and the 3 air holes (501) are arranged at equal intervals.
7. The method for the enhanced separation and extraction of sludge micro-plastics as claimed in claim 1, wherein the dryer (7) is a silica gel column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211406131.0A CN115626752A (en) | 2022-11-10 | 2022-11-10 | Method for reinforced separation and extraction of sludge micro-plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211406131.0A CN115626752A (en) | 2022-11-10 | 2022-11-10 | Method for reinforced separation and extraction of sludge micro-plastic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115626752A true CN115626752A (en) | 2023-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211406131.0A Pending CN115626752A (en) | 2022-11-10 | 2022-11-10 | Method for reinforced separation and extraction of sludge micro-plastic |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214234466U (en) * | 2020-11-24 | 2021-09-21 | 青岛浩海仪器有限公司 | Device for separating micro-plastics from sediments |
| CN114409226A (en) * | 2021-12-21 | 2022-04-29 | 中国光大绿色技术创新研究院有限公司 | Low-temperature plasma device for residual sludge wall breaking digestion |
| CN114608927A (en) * | 2022-03-16 | 2022-06-10 | 昆明理工大学 | Method for extracting micro-plastics from soil by microwave digestion method |
| CN114918242A (en) * | 2022-05-07 | 2022-08-19 | 浙江大学 | Micro-plastic contaminated soil remediation device and method based on coaxial DBD plasma technology |
| CN115259586A (en) * | 2021-04-29 | 2022-11-01 | 暨南大学 | Method for extracting micro-plastic from sludge and application |
-
2022
- 2022-11-10 CN CN202211406131.0A patent/CN115626752A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214234466U (en) * | 2020-11-24 | 2021-09-21 | 青岛浩海仪器有限公司 | Device for separating micro-plastics from sediments |
| CN115259586A (en) * | 2021-04-29 | 2022-11-01 | 暨南大学 | Method for extracting micro-plastic from sludge and application |
| CN114409226A (en) * | 2021-12-21 | 2022-04-29 | 中国光大绿色技术创新研究院有限公司 | Low-temperature plasma device for residual sludge wall breaking digestion |
| CN114608927A (en) * | 2022-03-16 | 2022-06-10 | 昆明理工大学 | Method for extracting micro-plastics from soil by microwave digestion method |
| CN114918242A (en) * | 2022-05-07 | 2022-08-19 | 浙江大学 | Micro-plastic contaminated soil remediation device and method based on coaxial DBD plasma technology |
Non-Patent Citations (2)
| Title |
|---|
| 李腾飞: "放电等离子体对剩余污泥的破解及其有害组分的影响", 《中国博士学位论文全文数据库 工程科技I辑》, 15 March 2022 (2022-03-15), pages 2 - 1 * |
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