CN112707484A - Automatic control system and method for adding liquid medicament - Google Patents
Automatic control system and method for adding liquid medicament Download PDFInfo
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- CN112707484A CN112707484A CN202011422364.0A CN202011422364A CN112707484A CN 112707484 A CN112707484 A CN 112707484A CN 202011422364 A CN202011422364 A CN 202011422364A CN 112707484 A CN112707484 A CN 112707484A
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- 239000003814 drug Substances 0.000 title claims abstract description 69
- 239000007788 liquid Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000010865 sewage Substances 0.000 claims description 31
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000002351 wastewater Substances 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 abstract description 16
- 238000000746 purification Methods 0.000 abstract description 6
- 230000037452 priming Effects 0.000 abstract 2
- 230000003287 optical effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000011897 real-time detection Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5209—Regulation methods for flocculation or precipitation
-
- 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
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a liquid medicament adding automatic control system and a method, comprising a medicament storage device, a density measuring device and a PLC control box; storage device including medicine storage tank and floater level gauge, medicine storage tank be closed structure and side top be equipped with the exhaust hole I of atmosphere intercommunication, medicine storage tank top be equipped with the dog-house, medicine storage tank below is through adding medicine pipeline and effluent water sump intercommunication, is equipped with the electromagnetism measuring pump at the medicine pipeline, density measuring device including measuring tank, electron level gauge, pressure differential densimeter, electronic self priming pump and electric valve, floater level gauge and the equal electron level gauge of electromagnetism measuring pump, pressure differential densimeter, electronic self priming pump and electric valve all with PLC control box electric connection. The invention can detect the water in real time by linking the water density measuring device and the medicine storage device, accurately reflect the water quality condition, accurately and rapidly adjust the addition of the flocculating agent by the control of the PLC control box, and ensure the water purification quality.
Description
Technical Field
The invention belongs to the technical field of liquid medicament addition control, and particularly relates to an automatic liquid medicament addition control system and method for a flocculating agent in water treatment.
Background
In the actual production process of iron ore dressing, need consume a large amount of water resources, in order to build water-saving enterprise, reply the requirement that the water resource lacks and environmental protection, the iron ore dressing requires more and more high to the cyclic utilization rate of production water. The water quality of the circulating backwater is a key factor influencing mineral separation, and is directly related to production cost and economic benefit.
At present, the purpose of purifying the mineral separation circulating backwater is mainly realized by adding a flocculating agent. For small-particle pollutants in a sewage tank, a flocculating agent is added to enable suspended particles in the sewage to be gathered and enlarged or form floccules, so that the sedimentation of pollutant particles is accelerated, the pollutants are separated from return water, and the method is flocculation. However, the addition amount of the flocculating agent is difficult to control in field production operation, the addition amount of the flocculating agent is too small, and more suspended pollutants remain in the sewage, so that the expected sewage treatment effect cannot be achieved; and the addition amount of the flocculating agent is too high, so that the reagent is wasted, and the purification cost is increased.
At present, the addition of a flocculating agent is mainly judged through sewage turbidity at home and abroad, the water turbidity is detected by an optical instrument device generally, an optical detection system utilizes an optical element as an induction measuring probe, the price is relatively high, and the conventional optical detection device intelligently arranges a sensor at a specific position in a wastewater treatment pool to measure the water quality of a fixed point, so that the state of the overall water quality in the wastewater treatment pool is difficult to master, and the addition of the flocculating agent is difficult to master.
Furthermore, as the time of use increases, particles in the water can adhere to the optical elements and contaminate them, preventing the sensor from collecting light and causing a serious impact on the accuracy of the data collected. In order to clean the detection equipment, the optical sensor needs to be taken out of the wastewater tank regularly, and the optical sensor is installed in the wastewater tank again after being cleaned, so that the maintenance difficulty is extremely high.
In actual field production, a visual observation mode is mostly adopted, the quality of water is judged by experience, and then the dosing quantity of the flocculating agent is manually controlled, so that accurate water quality parameters cannot be provided, and the flocculating agent cannot be accurately added due to the existence of time delay and hysteresis.
Disclosure of Invention
The invention aims to provide a liquid medicament adding automatic control system and a liquid medicament adding automatic control method which have the advantages of simple structure, low cost and easy operation, can meet the requirements of water body purification treatment of flowing circulating wastewater and the like of mineral processing enterprises, and can control the adding amount of a flocculating agent according to the density of a water body.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a liquid medicament adding automatic control system, which is characterized in that: comprises a medicine storage device, a density measuring device and a PLC control box;
the medicine storage device comprises a medicine storage tank, a floating ball liquid level meter is arranged in the medicine storage tank, the medicine storage tank is of a closed structure, an exhaust hole I communicated with the atmosphere is formed in the upper side of the medicine storage tank, a feeding port is formed in the upper side of the medicine storage tank, the lower side of the medicine storage tank is communicated with a sewage pool through a medicine feeding pipeline, an electromagnetic metering pump is arranged on the medicine feeding pipeline, and the floating ball liquid level meter and the electromagnetic metering pump are both electrically connected with a PLC control box;
the density measuring device comprises a measuring tank, an electronic liquid level meter, a differential pressure densimeter, an electric self-sucking pump and an electric valve, wherein the measuring tank is a long cylindrical closed tank body, an exhaust hole II communicated with the atmosphere is formed in the upper portion of the measuring tank, the electronic liquid level meter is arranged on the upper portion of the measuring tank, the bottom of the measuring tank is hemispherical, the center of the bottom of the measuring tank is communicated with the electric valve through a drainage pipeline, an outlet of the electric valve is communicated with a sewage tank and used for discharging waste water in the measuring tank into the sewage tank, the lower side of the measuring tank is communicated with the electric self-sucking pump through a pipeline, and the electric self-sucking pump is communicated with the sewage tank and used for sucking the sewage; the differential pressure densimeter is fixedly arranged on the side wall of the measuring tank; the electronic liquid level meter, the differential pressure densimeter, the electric self-priming pump and the electric valve are all electrically connected with the PLC control box.
Preferably, the PLC control box includes a CPU, a digital output module, a digital input module, an analog output module, an analog input module, a power adapter, and a control panel.
The invention relates to an automatic control method for adding liquid medicament, which is characterized by comprising the following steps: comprises the following steps:
step 1: the liquid outlet end of the electromagnetic metering pump connected with the dosing pipeline is communicated with a sewage pool, a pipeline connected with an inlet of an electric self-sucking pump of the density measuring device and a pipeline connected with an outlet of an electric valve are led into the sewage pool, a power supply is switched on, and the system is started;
step 2: operating a PLC control box, initializing a program and setting system time;
and step 3: setting the density detection cycle time, wherein the setting time is 5min at minimum;
and 4, step 4: detecting the position of a floating ball liquid level meter, starting a density measuring device when the position of a floating ball is in a safe interval for storing the medicament amount, and prompting to supplement the medicament when the position of the floating ball is lower than the safe interval;
and 5: starting the electric valve by the PLC control box for 1min to ensure that the water body in the measuring tank is emptied;
step 6: the electric valve is closed, and the electric self-priming pump is controlled by the PLC control box to pump the water body to be measured,
and 7: when the water level in the measuring tank reaches the position of the electronic liquid level meter, the electronic liquid level meter feeds back a signal to the PLC control box, and then the PLC control box stops the operation of the electric self-priming pump, otherwise the self-priming pump continues to pump water;
and 8: after the self-priming pump stops running, the density detection program stops running for 1min, so that the liquid to be detected in the measuring tank is stable;
and step 9: the differential pressure densitometer measures the density of the water body in the measuring tank and feeds data back to the PLC control box;
step 10: calculating the flocculant adding amount through a PLC (programmable logic controller) internal formula to obtain the water body density detected in real time, displaying and recording the water body density on a control panel, and repeating the steps 5-9 after the set circulation time is reached;
step 11: the PLC control box starts the electromagnetic metering pump, adjusts the running efficiency of the electromagnetic metering pump according to the internal formula, and controls the flow of the medicament:
the symbols in the formula are: eta-electromagnetic metering pump operating efficiency%, Q-dosage L/h, QBAnd the maximum flow L/h of the electromagnetic metering pump.
The PLC in the step 10 is internally provided with a formula for calculating the flocculant adding amount:
the symbols in the formula are: q-the required dosage of the medicament is L/h, QwDischarge m of sewage3/h，ρx—kg/m3C is the concentration kg/L of the agent, k is the agent utilization coefficient, and b is the agent utilization constant.
The invention has the advantages that:
the device has simple structure, low cost and simple and convenient operation. The water density measuring device is linked with the medicine storage device, the water quality condition is accurately reflected through real-time detection of the water, and then the addition amount of the flocculating agent is accurately and quickly adjusted under the control of the PLC control box, so that the water purification quality is ensured.
Drawings
Fig. 1 is a schematic structural view of an automatic control system for adding a liquid medicine according to the present invention.
Fig. 2 is a flow chart of an automatic control method for adding liquid medicine according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, an automatic control system for adding a liquid medicine according to the present invention is characterized in that: comprises a medicine storage device, a density measuring device and a PLC control box 3;
the medicine storage device comprises a medicine storage tank 1, a floating ball liquid level meter 13 is arranged in the medicine storage tank 1, the medicine storage tank 1 is of a closed structure, an exhaust hole I11 communicated with the atmosphere is formed in the upper side of the medicine storage tank 1, a feeding port 12 is formed in the upper side of the medicine storage tank 1, the lower side of the medicine storage tank 1 is communicated with a sewage tank 4 through a medicine feeding pipeline, an electromagnetic metering pump 14 is arranged on the medicine feeding pipeline, and the floating ball liquid level meter 13 and the electromagnetic metering pump 14 are both electrically connected with a PLC control box 3;
the density measuring device comprises a measuring tank 2, an electronic liquid level meter 22, a differential pressure densimeter 23, an electric self-priming pump 24 and an electric valve 25, wherein the measuring tank 2 is a long cylindrical closed tank body, an exhaust hole II 21 communicated with the atmosphere is formed in the upper portion of the measuring tank 2, the electronic liquid level meter 22 is arranged in the measuring tank 2, the bottom of the measuring tank 2 is hemispherical, the center of the bottom of the measuring tank 2 is communicated with the electric valve 25 through a drainage pipeline, the outlet of the electric valve 25 is communicated with a sewage tank 4 and used for discharging waste water in the measuring tank into the sewage tank 4, the lower side of the measuring tank 2 is communicated with the electric self-priming pump 24 through a pipeline, and the electric self-priming pump 24 is communicated with the sewage tank 4 and used for pumping the waste water into the measuring tank 2; the differential pressure densimeter 23 is fixedly arranged on the side wall of the measuring tank 2; and the electronic liquid level meter 22, the differential pressure densimeter 23, the electric self-priming pump 24 and the electric valve 25 are electrically connected with the PLC control box 3.
The PLC control box 3 comprises a CPU, a digital quantity output module, a digital quantity input module, an analog quantity output module, an analog quantity input module, a power adapter and a control panel.
As shown in fig. 2, the automatic control method for adding a liquid chemical according to the present invention is characterized in that: comprises the following steps:
step 1: the liquid outlet end of the electromagnetic metering pump 14 connected with the dosing pipeline is communicated with the sewage pool 4, a pipeline connected with the inlet of an electric self-sucking pump 24 of the density measuring device and a pipeline connected with the outlet of an electric valve 25 are led into the sewage pool 4, and a power supply is switched on and the system is started;
step 2: operating the PLC control box 3, initializing a program and setting system time;
and step 3: setting the density detection cycle time, wherein the setting time is 5min at minimum;
and 4, step 4: detecting the position of a floating ball liquid level meter 13, starting a density measuring device when the position of a floating ball is in a safe interval for storing the amount of the medicament, and prompting to supplement the medicament when the position of the floating ball is lower than the safe interval;
and 5: the electric valve 25 is started through the PLC control box 3, the starting time is 1min, and the water in the measuring tank 2 is ensured to be emptied;
step 6: the electric valve 25 is closed, and simultaneously the electric self-priming pump 24 is controlled by the PLC control box 3 to pump the water body to be measured;
and 7: when the water level in the measuring tank 2 reaches the position of the electronic liquid level meter, the electronic liquid level meter feeds back a signal to the PLC control box 3, then the PLC control box 3 stops the operation of the electric self-priming pump 24, otherwise, the self-priming pump continues to pump water;
and 8: after the self-priming pump stops running, the density detection program stops running for 1min, so that the liquid to be detected in the measuring tank 2 is stable;
and step 9: the differential pressure densitometer measures the density of the water body in the measuring tank and feeds data back to the PLC control box;
step 10: calculating the dosage of the flocculating agent by a PLC (programmable logic controller) internal formula to obtain a water body for real-time detection
Density, displaying and recording on a control panel, and repeating the step 5-9 after the set cycle time is reached;
the PLC in the step 10 is internally provided with a formula for calculating the flocculant adding amount:
the symbols in the formula are: q-the required dosage of the medicament is L/h, QwDischarge m of sewage3/h，ρx—kg/m3C is the concentration kg/L of the agent, k is the agent utilization coefficient, and b is the agent utilization constant.
Step 11: the PLC control box starts the electromagnetic metering pump, adjusts the running efficiency of the electromagnetic metering pump according to the internal formula, and controls the flow of the medicament:
the symbols in the formula are: eta-electromagnetic metering pump operating efficiency%, Q-dosage L/h, QBAnd the maximum flow L/h of the electromagnetic metering pump.
Discharge Q of sewage pool of certain selected factorywIs 520m3And h, selecting the concentration C of the mixed flocculant as 300ppm kg/L, and setting the agent utilization constant k as 2331.57ppm and b as-4029.46 according to field tests: 4041.34 ρx-4029.46。
In the sewage pool of the selected factory, the automatic control system for adding the liquid medicament is utilized to detect the sewage density and control the dosing system to add the flocculating agent, the maximum flow of the dosing electromagnetic metering pump is 320L/h, and the following data are obtained:
the water density measuring device is linked with the medicine storage device, the water quality condition is accurately reflected through real-time detection of the water, the addition amount of the flocculating agent is accurately and rapidly adjusted through the control of the PLC system, the purification result meets the recycling requirement, and the water purification quality is ensured.
Claims (4)
1. An automatic control system for adding liquid medicament is characterized in that: comprises a medicine storage device, a density measuring device and a PLC control box;
the medicine storage device comprises a medicine storage tank, a floating ball liquid level meter is arranged in the medicine storage tank, the medicine storage tank is of a closed structure, an exhaust hole I communicated with the atmosphere is formed in the upper side of the medicine storage tank, a feeding port is formed in the upper side of the medicine storage tank, the lower side of the medicine storage tank is communicated with a sewage pool through a medicine feeding pipeline, an electromagnetic metering pump is arranged on the medicine feeding pipeline, and the floating ball liquid level meter and the electromagnetic metering pump are both electrically connected with a PLC control box;
the density measuring device comprises a measuring tank, an electronic liquid level meter, a differential pressure densimeter, an electric self-sucking pump and an electric valve, wherein the measuring tank is a long cylindrical closed tank body, an exhaust hole II communicated with the atmosphere is formed in the upper portion of the measuring tank, the electronic liquid level meter is arranged on the upper portion of the measuring tank, the bottom of the measuring tank is hemispherical, the center of the bottom of the measuring tank is communicated with the electric valve through a drainage pipeline, an outlet of the electric valve is communicated with a sewage tank and used for discharging waste water in the measuring tank into the sewage tank, the lower side of the measuring tank is communicated with the electric self-sucking pump through a pipeline, and the electric self-sucking pump is communicated with the sewage tank and used for sucking the sewage; the differential pressure densimeter is fixedly arranged on the side wall of the measuring tank; the electronic liquid level meter, the differential pressure densimeter, the electric self-priming pump and the electric valve are all electrically connected with the PLC control box.
2. The liquid medicine addition automatic control system according to claim 1, characterized in that: the PLC control box comprises a CPU, a digital quantity output module, a digital quantity input module, an analog quantity output module, an analog quantity input module, a power adapter and a control panel.
3. An automatic control method for adding liquid medicament is characterized in that: comprises the following steps:
step 1: the liquid outlet end of the electromagnetic metering pump connected with the dosing pipeline is communicated with a sewage pool, a pipeline connected with an inlet of an electric self-sucking pump of the density measuring device and a pipeline connected with an outlet of an electric valve are led into the sewage pool, a power supply is switched on, and the system is started;
step 2: operating a PLC control box, initializing a program and setting system time;
and step 3: setting the density detection cycle time, wherein the setting time is 5min at minimum;
and 4, step 4: detecting the position of a floating ball liquid level meter, starting a density measuring device when the position of a floating ball is in a safe interval for storing the medicament amount, and prompting to supplement the medicament when the position of the floating ball is lower than the safe interval;
and 5: starting the electric valve by the PLC control box for 1min to ensure that the water body in the measuring tank is emptied;
step 6: the electric valve is closed, and the electric self-priming pump is controlled by the PLC control box to pump the water body to be measured,
and 7: when the water level in the measuring tank reaches the position of the electronic liquid level meter, the electronic liquid level meter feeds back a signal to the PLC control box, and then the PLC control box stops the operation of the electric self-priming pump, otherwise the self-priming pump continues to pump water;
and 8: after the self-priming pump stops running, the density detection program stops running for 1min, so that the liquid to be detected in the measuring tank is stable;
and step 9: the differential pressure densitometer measures the density of the water body in the measuring tank and feeds data back to the PLC control box;
step 10: calculating the flocculant adding amount through a PLC (programmable logic controller) internal formula to obtain the water body density detected in real time, displaying and recording the water body density on a control panel, and repeating the steps 5-9 after the set circulation time is reached;
step 11: the PLC control box starts the electromagnetic metering pump, adjusts the running efficiency of the electromagnetic metering pump according to the internal formula, and controls the flow of the medicament:
step 11: the PLC control box starts the electromagnetic metering pump, adjusts the running efficiency of the electromagnetic metering pump according to the internal formula, and controls the flow of the medicament:
the symbols in the formula are: eta-electromagnetic metering pump operating efficiency%, Q-dosage L/h, QBAnd the maximum flow L/h of the electromagnetic metering pump.
4. The automatic control method for liquid medical agent addition according to claim 3, characterized in that:
in the step 10, the flocculant adding amount is calculated through a formula arranged in the PLC,
the symbols in the formula are: q-the required dosage of the medicament is L/h, QwDischarge m of sewage3/h，ρx—kg/m3C is the concentration kg/L of the agent, k is the agent utilization coefficient, and b is the agent utilization constant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011422364.0A CN112707484A (en) | 2020-12-08 | 2020-12-08 | Automatic control system and method for adding liquid medicament |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011422364.0A CN112707484A (en) | 2020-12-08 | 2020-12-08 | Automatic control system and method for adding liquid medicament |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118221261A (en) * | 2024-05-23 | 2024-06-21 | 潍坊天创生物科技有限公司 | Self-adaptive sewage treatment system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5902487A (en) * | 1995-04-03 | 1999-05-11 | Allied Colloids Limited | Process and apparatus for dewatering a suspension |
| CN205120523U (en) * | 2015-10-15 | 2016-03-30 | 上海梅思泰克环境股份有限公司 | Flue gas desulfurization system absorbs slurry density value measuring device |
| CN107966411A (en) * | 2017-12-27 | 2018-04-27 | 北京东方园林环境股份有限公司 | A kind of miniature automatic water quality monitoring quality control system and mark-on reclaims method |
-
2020
- 2020-12-08 CN CN202011422364.0A patent/CN112707484A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5902487A (en) * | 1995-04-03 | 1999-05-11 | Allied Colloids Limited | Process and apparatus for dewatering a suspension |
| CN205120523U (en) * | 2015-10-15 | 2016-03-30 | 上海梅思泰克环境股份有限公司 | Flue gas desulfurization system absorbs slurry density value measuring device |
| CN107966411A (en) * | 2017-12-27 | 2018-04-27 | 北京东方园林环境股份有限公司 | A kind of miniature automatic water quality monitoring quality control system and mark-on reclaims method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118221261A (en) * | 2024-05-23 | 2024-06-21 | 潍坊天创生物科技有限公司 | Self-adaptive sewage treatment system |
| CN118221261B (en) * | 2024-05-23 | 2024-08-27 | 潍坊天创生物科技有限公司 | Self-adaptive sewage treatment system |
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Application publication date: 20210427 |