CN110745942A - Automatic anaerobic three-phase separation system and control method - Google Patents
Automatic anaerobic three-phase separation system and control method Download PDFInfo
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- CN110745942A CN110745942A CN201911041128.1A CN201911041128A CN110745942A CN 110745942 A CN110745942 A CN 110745942A CN 201911041128 A CN201911041128 A CN 201911041128A CN 110745942 A CN110745942 A CN 110745942A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
Abstract
The invention relates to an automatic anaerobic three-phase separation system and a control method thereof, wherein the automatic anaerobic three-phase separation system comprises a reactor, a three-phase separator arranged inside the reactor, a water seal assembly arranged outside the reactor and a controller; the three-phase separator comprises a plurality of gas collecting hoods arranged in parallel, gas collecting pipes communicated with the upper ends of the gas collecting hoods, and a gas chamber liquid level meter arranged at the upper end of any one of the gas collecting hoods; the water seal assembly comprises a water seal tank, an air outlet pipe, an water inlet pipe, a water outlet pipe and a water seal liquid level meter, wherein the air outlet pipe, the water inlet pipe, the water outlet pipe and the water seal liquid level meter are arranged on the water seal tank; the controller is respectively electrically connected with the air chamber liquid level meter, the water seal liquid level meter, the first valve and the second valve. The invention adopts a three-phase separation system consisting of a three-phase separator with a double-layer inverted V-shaped structure and a water-sealed tank, and can automatically adjust the pressure of an air chamber through the coordination control of a controller so as to be matched with the operation of the system.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to an automatic anaerobic three-phase separation system and a control method.
Background
Anaerobic digestion of wastewater treatment pollutants can be broadly divided into the following steps: 1) a hydrolysis acidification stage; 2) acid production and acetic acid production stages; 3) a methanogenesis stage. In the hydrolysis acidification stage, macromolecular refractory organic matters in water are subjected to ring opening and chain scission decomposition into degradable micromolecular organic matters under the action of hydrolysis acidification bacteria; in the acid and acetic acid producing stage, under the action of acetogenic bacteria, products in the hydrolysis acidification stage are further decomposed into volatile organic acids such as acetic acid and propionic acid; the methanogenesis stage is to reduce volatile organic acid generated in the acid production and acetic acid production stage or hydrogen and carbon dioxide generated in the acid production and acetic acid production stage into methane under the action of methane bacteria. In summary, the process of anaerobic treatment of wastewater is a process of decomposing organic matters in water into methane.
The anaerobic reactor corresponding to the anaerobic treatment of waste water is mainly composed of a water inlet system, a reaction zone and a three-phase separation system. The efficiency of the anaerobic reactor is determined by the anaerobic sludge concentration in the reactor to a great extent, so that the condition that the sludge is not lost is the central importance of the anaerobic system, but because the anaerobic system has the methane production phenomenon, the sludge slightly floats under the micro-bubble wrapping, the difficulty is increased for the sludge loss prevention, and therefore, a three-phase separation system is appeared, so that the gas, the liquid and the solid are well separated, the supernatant is discharged, the sludge flows back into the reactor through a backflow seam of the three-phase separator to ensure the sludge concentration, and the methane is directly discharged into the atmosphere after passing through a water-sealed tank or is recycled as energy, so the three-phase separation system is the core and the key components of the whole anaerobic reactor.
The prior art has the defects that the pressure of an air chamber in the three-phase separator is difficult to monitor in real time, adjust in time according to the operation condition and adjust to a reasonable level according to actual requirements. Because the pressure of the gas chamber needs to be adjusted according to the steam production strength in the reactor, and the steam production strength is difficult to stabilize due to the influence of many factors, if the pressure of the gas chamber cannot be adjusted timely according to the steam production strength, the pressure of the gas chamber is too high, and bubbles escape from the gas chamber to influence sludge sedimentation; or the air pressure of the air chamber is not enough, the three-phase separation is not ideal, and the three-phase mixed liquid enters the water-sealed tank along with the three-phase separator biogas collecting pipe; therefore, the invention develops an automatic anaerobic three-phase separation system and a control method to solve the problems in the prior art, and a technical scheme which is the same as or similar to the automatic anaerobic three-phase separation system is not found through retrieval.
Disclosure of Invention
The invention aims to: provides an automatic anaerobic three-phase separation system and a control method thereof, which aim to solve the problem that the pressure of an air chamber in a three-phase separator is not easy to adjust in the prior art.
The technical scheme of the invention is as follows: an automatic anaerobic three-phase separation system comprises a reactor, a three-phase separator arranged in the reactor, a water seal assembly arranged outside the reactor and a controller; the three-phase separator comprises a plurality of gas collecting hoods arranged in parallel, gas collecting pipes communicated with the upper ends of the gas collecting hoods, and a gas chamber liquid level meter arranged at the upper end of any one of the gas collecting hoods; the water seal assembly comprises a water seal tank, an air outlet pipe, an water inlet pipe, a water outlet pipe and a water seal liquid level meter, wherein the air outlet pipe, the water inlet pipe, the water outlet pipe and the water seal liquid level meter are arranged on the water seal tank; the controller is respectively electrically connected with the air chamber liquid level meter, the water seal liquid level meter, the first valve and the second valve.
Preferably, the gas collecting hoods are of an inverted V-shaped structure, two groups of gas collecting hoods are arranged up and down, the gas collecting hoods on the upper layer are sequentially arranged above the space between two adjacent gas collecting hoods on the lower layer at intervals, the width of the gas collecting hoods is larger than the distance between the lower ends of the two adjacent gas collecting hoods on the lower layer, and the lower ends of the gas collecting hoods on the two sides of the upper layer, which are close to the inner wall of the reactor, are respectively and fixedly connected with the inner wall of the reactor; a flow guide body is sequentially arranged below the space between two adjacent gas-collecting hoods on the lower layer.
Preferably, the air chamber liquid level meter is an ultrasonic liquid level meter and is arranged at the top end of any gas-collecting hood at the lower layer; the water seal liquid level meter is an ultrasonic liquid level meter and is fixedly installed at the top end of the water seal tank.
Preferably, the gas collecting pipe comprises a plurality of first branch pipes, a first header pipe, a plurality of second branch pipes and a second header pipe, the upper ends of the gas collecting hoods on the upper layer are respectively connected with the first branch pipes, the plurality of first branch pipes are communicated with the first header pipe, and the first header pipe extends into the water seal tank; and the upper ends of the gas collecting hoods on the lower layer are respectively connected with second branch pipes, the second branch pipes are communicated with a second header pipe, and the second header pipe extends into the water seal tank.
Preferably, the reactor is of a cuboid structure, two ends of the gas collecting channels are respectively fixed on a pair of parallel end face inner walls of the reactor, and overflow weirs are arranged at the upper ends of the pair of parallel end face inner walls of the reactor, which are perpendicular to the fixed ends of the gas collecting channels.
Based on an automatic anaerobic three-phase separation system, a control method of the automatic anaerobic three-phase separation system is also developed, and the control method specifically comprises the following steps:
(1) presetting in a controller: injecting waste water into the reactor, forming an air chamber at the upper end part of the gas collecting hood through three-phase separation, setting a liquid level height in the gas collecting hood at the lower end of the air chamber, setting an upper limit value and a lower limit value of the liquid level height in the gas collecting hood through a controller, and recording that the upper limit value is L1Lower limit value of L2；
(2) The liquid level in the gas collecting hood is monitored in real time through the gas chamber liquid level meter, and the real-time liquid level is recorded as LQAnd transmitted to the controller; the liquid level in the water seal tank is detected in real time through the water seal liquid level meter, and the recorded liquid level is LsAnd transmitted to the controller;
(3) determination of LQRelative to L1And L2And controls the operation of the first valve and the second valve; if L is1＞LQ＞L2The first valve and the second valve do not work; if L isQ＞L1If yes, executing the step (4); if L isQ＜L2If yes, executing the step (5);
(4) if L isQ＞L1The controller controls the first valve to be opened, so that the liquid level in the water seal tank rises, and the liquid level height is monitored in real time through the water seal liquid level meter, wherein the rising height of the liquid level is LQ-L1That is, the water seal level meter monitors the liquid level to reach Ls+(LQ-L1) When the first valve is closed;
(5) if L isQ＜L2The controller controls the second valve to be opened, so that the liquid level in the water seal tank is lowered, the liquid level is detected in real time through the water seal liquid level meter, and the lowered height of the liquid level is L2-LQThat is, the water seal level meter monitors the liquid level to reach Ls-(L2-LQ) At this time, the second valve is closed.
Compared with the prior art, the invention has the advantages that:
(1) the invention adopts a three-phase separation system consisting of a three-phase separator with a double-layer inverted V-shaped structure and a water-sealed tank, compared with the traditional structure, the three-phase separation system is additionally provided with an air chamber liquid level meter, when the three-phase separation system works, the interior of a reactor is filled with wastewater, gas can be separated and collected through three-phase separation, the gas is gathered at the upper end of a gas collecting hood, so that an air chamber is formed, the air chamber liquid level meter can monitor the liquid level at the lower end of the air chamber in real time, and the pressure of the air chamber can be.
(2) Because the high degree of efficiency of anaerobic reactor is decided by the anaerobic sludge concentration in the reactor, therefore the real-time adjustment and balance of the air chamber pressure can effectively ensure the treatment efficiency, can avoid the over-high air chamber pressure, the gas flows out from the side edge of the gas-collecting hood, the settled sludge can float away under the action of the gas to influence the sludge concentration, and can also avoid the over-low air chamber pressure, and the sludge enters from the lower end of the gas-collecting hood to cause the blockage of the gas-collecting pipe.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a top view of the gas skirt of the present invention with the gas chamber level gauge installed;
fig. 3 is a control flow diagram of the architecture of the present invention.
Wherein: 1. the device comprises a reactor, 2, an overflow weir, 3, a gas collecting hood, 4, a flow guiding body, 5, a gas chamber, 6, a gas chamber liquid level meter, 7, a gas collecting pipe, 8, a first branch pipe, 9, a first main pipe, 10, a second branch pipe, 11, a second main pipe, 12, a water seal tank, 13, a water inlet pipe, 14, a first valve, 15, a water outlet pipe, 16, a second valve, 17, a gas outlet pipe, 18 and a water seal liquid level meter.
Detailed Description
The present invention will be further described in detail with reference to the following specific examples:
as shown in fig. 1 and 2, an automatic anaerobic three-phase separation system for realizing the treatment of wastewater and well separating gas, liquid and solid phases, discharging supernatant, and returning sludge into a reactor through a backflow seam of a three-phase separator to ensure the concentration of the sludge, and directly discharging biogas into the atmosphere after passing through a water-sealed tank or as energy recycling, mainly comprises a reactor 1, a three-phase separator arranged inside the reactor 1, a water seal assembly arranged outside the reactor 1 and a controller.
The three-phase separator comprises a plurality of gas-collecting hoods 3 arranged in parallel, a gas-collecting pipe 7 communicated with the upper ends of the gas-collecting hoods 3 and a gas-chamber liquid level meter 6 extending to the lower end of any one of the gas-collecting hoods 3; the gas collecting hoods 3 are immersed in the wastewater, biogas generated after three-phase separation can be gathered above the gas collecting hoods 3 to form a gas chamber 5, two ends of the gas collecting hoods 3 in the long axis direction are respectively fixed on the inner walls of a pair of parallel end faces of the reactor 1, which are perpendicular to the end face where the overflow weir 2 is located, the gas collecting hoods are in an inverted V-shaped structure along the section parallel to the fixed end faces, the two groups are arranged up and down, the gas collecting hoods 3 located on the upper layer are sequentially arranged above the space between two adjacent gas collecting hoods 3 on the lower layer at intervals, the width of each gas collecting hood 3 is larger than the distance between the lower ends of the two adjacent gas collecting hoods 3 on the lower layer, and the lower ends of the gas collecting hoods 3 on the two sides of; a flow guide body 4 is sequentially arranged below the space between two adjacent gas collecting hoods 3 on the lower layer, and the flow guide body 4 is of a rhombus structure which is asymmetric from top to bottom and symmetric from side to side along the section parallel to the fixed end surfaces of the gas collecting hoods 3 and is used for realizing the flow guide effect of wastewater; two through holes are formed in the upper end of the single gas collecting hood 3 connected with the gas chamber liquid level meter 6, one through hole is used for installing the gas chamber liquid level meter 6, the other through hole is used for connecting and installing the gas collecting pipe 7, and the through holes are formed in the upper ends of the remaining gas collecting hoods 3 and are used for connecting and installing the gas collecting pipe 7.
The gas collecting pipe 7 comprises a plurality of first branch pipes 8, a first main pipe 9, a plurality of second branch pipes 10 and a second main pipe 11, the upper ends of the upper layer of the plurality of gas collecting hoods 3 are respectively connected with the first branch pipes 8, the plurality of first branch pipes 8 are communicated with the first main pipe 9, and the first main pipe 9 extends into the water seal tank; the upper ends of a plurality of gas collecting hoods 3 on the lower layer are respectively connected with a plurality of second branch pipes 10, the plurality of second branch pipes 10 are communicated with a second main pipe 11, and the second main pipe 11 extends into a water seal tank.
The air chamber liquid level meter 6 selects an ultrasonic liquid level meter and is installed at the top end of any gas collecting hood 3 positioned at the lower layer, and the air chamber liquid level meter 6 is used for monitoring the liquid level height below the air chamber 5 in real time, so that the pressure of the air chamber 5 can be conveniently judged.
The water seal assembly comprises a water seal tank 12, an air outlet pipe 17, an water inlet pipe 13, an water outlet pipe 15 and a water seal liquid level meter 18 which are arranged on the water seal tank 12, liquid water is arranged in the water seal tank 12, and the end parts of the first main pipe 9 and the second main pipe 11 extend into the liquid water in the water seal tank 12; a first valve 14 is arranged on the water inlet pipe 13, and a second valve 16 is arranged on the water outlet pipe 15; the water seal liquid level meter 18 is also an ultrasonic liquid level meter and is fixedly installed at the upper end of the water seal tank 12 and used for monitoring the liquid level height of liquid water in the water seal tank 12 in real time.
The controller is respectively electrically connected with the air chamber liquid level meter 6, the water seal liquid level meter 18, the first valve 14 and the second valve 16, as shown in fig. 3, the control method is as follows:
(1) presetting in a controller: waste water is injected into the reactor 1, an air chamber 5 is formed at the upper end of the gas collecting hood 3 through three-phase separation, a liquid level height is formed in the gas collecting hood 3 at the lower end of the air chamber 5, the upper limit value and the lower limit value of the liquid level height in the gas collecting hood 3 are set through a controller, and the upper limit value is recorded as L1Lower limit value of L2；
(2) The liquid level in the gas collecting hood 3 is monitored in real time through the gas chamber liquid level meter 6, and the real-time liquid level is recorded as LQAnd transmitted to the controller; the liquid level in the water seal tank 12 is detected in real time through the water seal liquid level meter 18, and the liquid level is recorded as LsAnd transmitted to the controller;
(3) determination of LQRelative to L1And L2And controls the operation of the first valve 14 and the second valve 16; if L is1＞LQ＞L2The first valve 14 and the second valve 16 are not operated; if L isQ＞L1If yes, executing the step (4); if L isQ＜L2If yes, executing the step (5);
(4) if L isQ＞L1The controller controls the firstThe valve 14 is opened to raise the liquid level in the water-sealed tank 12, and the liquid level is monitored in real time by the water-sealed liquid level meter 18, wherein the liquid level needs to be raised by LQ-L1I.e. the water seal level gauge 18 monitors the liquid level to reach Ls+(LQ-L1) When, the first valve 14 is closed;
(5) if L isQ＜L2The controller controls the second valve 16 to open so that the liquid level in the water-sealed tank 12 is lowered, and detects the liquid level in real time through the water-sealed liquid level meter 18, wherein the liquid level needs to be lowered by L2-LQI.e. the water seal level gauge 18 monitors the liquid level to reach Ls-(L2-LQ) At this time, the second valve 16 is closed.
The air chamber liquid level meter 6 transmits signals to the controller in real time, and controls the opening of the first valve 14 and the second valve 16 through the comparison and analysis of the liquid level height, so as to adjust the height of the liquid level in the water seal tank 12; the water seal liquid level meter 18 sends signals to the controller in real time and monitors the rising and falling heights of the liquid level in the water seal tank 12, so that the first valve 14 and the second valve 16 are closed.
When the device works, the lower end of the reactor 1 discharges and enters wastewater, because the invention relates to an automatic anaerobic three-phase separation system, a water inlet system below the reactor 1 is not described in detail, the wastewater is well separated into three phases of gas, liquid and solid through a three-phase separator, the supernatant is finally discharged from an overflow weir 2, sludge flows back into the reactor 1 through the three-phase separator to ensure the concentration of the sludge, methane enters the upper end of a gas collecting hood 3 and enters a water-sealed tank 12 through a gas collecting pipe 7 or is directly discharged into the atmosphere through a gas outlet pipe 17 or is recycled as energy, an additionally arranged gas chamber liquid level meter 6 can monitor the liquid level at the lower end of the gas chamber 5 in real time, and the pressure of the gas chamber 5 can be automatically adjusted through the coordination control of a controller so as to be matched with the operation of the system.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present embodiments be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, without any reference thereto being construed as limiting the claim concerned.
Claims (6)
1. An automatic anaerobism three-phase separation system which characterized in that: comprises a reactor, a three-phase separator arranged inside the reactor, a water seal assembly arranged outside the reactor and a controller; the three-phase separator comprises a plurality of gas collecting hoods arranged in parallel, gas collecting pipes communicated with the upper ends of the gas collecting hoods, and a gas chamber liquid level meter arranged at the upper end of any one of the gas collecting hoods; the water seal assembly comprises a water seal tank, an air outlet pipe, an water inlet pipe, a water outlet pipe and a water seal liquid level meter, wherein the air outlet pipe, the water inlet pipe, the water outlet pipe and the water seal liquid level meter are arranged on the water seal tank; the controller is respectively electrically connected with the air chamber liquid level meter, the water seal liquid level meter, the first valve and the second valve.
2. An automated anaerobic three-phase separation system according to claim 1, wherein: the gas collecting hoods are of an inverted V-shaped structure, the upper and lower gas collecting hoods are arranged in two groups, the gas collecting hoods on the upper layer are sequentially arranged above the space between two adjacent gas collecting hoods on the lower layer at intervals, the width of the gas collecting hoods is larger than the distance between the lower end parts of the two adjacent gas collecting hoods on the lower layer, and the lower ends, close to the inner wall of the reactor, of the gas collecting hoods on the two sides of the upper layer are respectively and fixedly connected with the inner wall of the reactor; a flow guide body is sequentially arranged below the space between two adjacent gas-collecting hoods on the lower layer.
3. An automated anaerobic three-phase separation system according to claim 2, wherein: the air chamber liquid level meter is an ultrasonic liquid level meter and is arranged at the top end of any gas-collecting hood at the lower layer; the water seal liquid level meter is an ultrasonic liquid level meter and is fixedly installed at the top end of the water seal tank.
4. An automated anaerobic three-phase separation system according to claim 2, wherein: the gas collecting pipe comprises a plurality of first branch pipes, a first header pipe, a plurality of second branch pipes and a second header pipe, the upper ends of the gas collecting hoods on the upper layer are respectively connected with the first branch pipes, the first branch pipes are communicated with the first header pipe, and the first header pipe extends into the water seal tank; and the upper ends of the gas collecting hoods on the lower layer are respectively connected with second branch pipes, the second branch pipes are communicated with a second header pipe, and the second header pipe extends into the water seal tank.
5. An automated anaerobic three-phase separation system according to claim 1, wherein: the reactor is of a cuboid structure, two ends of the gas collecting hoods are respectively fixed on a pair of parallel end surface inner walls of the reactor, and overflow weirs are arranged at the upper ends of the pair of parallel end surface inner walls of the reactor, which are perpendicular to the fixed ends of the gas collecting hoods.
6. The control method of the automatic anaerobic three-phase separation system based on claim 1 is characterized in that: the control method specifically comprises the following steps:
(1) presetting in a controller: injecting waste water into the reactor, forming an air chamber at the upper end part of the gas collecting hood through three-phase separation, setting a liquid level height in the gas collecting hood at the lower end of the air chamber, setting an upper limit value and a lower limit value of the liquid level height in the gas collecting hood through a controller, and recording that the upper limit value is L1Lower limit value of L2；
(2) The liquid level in the gas collecting hood is monitored in real time through the gas chamber liquid level meter, and the real-time liquid level is recorded as LQAnd transmitted to the controller; the liquid level in the water seal tank is detected in real time through the water seal liquid level meter, and the recorded liquid level is LsAnd transmitted to the controller;
(3) determination of LQRelative to L1And L2The size of (a) is (b),and controlling the work of the first valve and the second valve; if L is1＞LQ＞L2The first valve and the second valve do not work; if L isQ＞L1If yes, executing the step (4); if L isQ＜L2If yes, executing the step (5);
(4) if L isQ＞L1The controller controls the first valve to be opened, so that the liquid level in the water seal tank rises, and the liquid level height is monitored in real time through the water seal liquid level meter, wherein the rising height of the liquid level is LQ-L1That is, the water seal level meter monitors the liquid level to reach Ls+(LQ-L1) When the first valve is closed;
(5) if L isQ＜L2The controller controls the second valve to be opened, so that the liquid level in the water seal tank is lowered, the liquid level is detected in real time through the water seal liquid level meter, and the lowered height of the liquid level is L2-LQThat is, the water seal level meter monitors the liquid level to reach Ls-(L2-LQ) At this time, the second valve is closed.
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| CN201911041128.1A CN110745942A (en) | 2019-10-30 | 2019-10-30 | Automatic anaerobic three-phase separation system and control method |
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| CN201911041128.1A CN110745942A (en) | 2019-10-30 | 2019-10-30 | Automatic anaerobic three-phase separation system and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111777263A (en) * | 2020-06-05 | 2020-10-16 | 成都工业学院 | Resourceful treatment method for aquaculture wastewater |
| CN115432766A (en) * | 2022-10-06 | 2022-12-06 | 上海铸奇环保科技有限公司 | Method for controlling pressure of flotation tank |
-
2019
- 2019-10-30 CN CN201911041128.1A patent/CN110745942A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111777263A (en) * | 2020-06-05 | 2020-10-16 | 成都工业学院 | Resourceful treatment method for aquaculture wastewater |
| CN115432766A (en) * | 2022-10-06 | 2022-12-06 | 上海铸奇环保科技有限公司 | Method for controlling pressure of flotation tank |
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