CN112504506A - Device and method for in-situ online monitoring of performance of biological tank of sewage treatment plant - Google Patents
Device and method for in-situ online monitoring of performance of biological tank of sewage treatment plant Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
Abstract
A device and a method for in-situ online monitoring of the performance of a biological pond of a sewage treatment plant comprise a water inlet system, a reaction system, a temperature detection and maintenance system, a data detection system, a logic control and data processing system and a feed liquid quantitative supplement system; the sewage treatment operator can obtain the running state of the biological pond in a short time by quickly and directly measuring the performance of the activated sludge. The device does not need special person to watch, realizes the cleanness of the device and the detection sensor through the logic controller, keeps the reaction system and the actual temperature the same, and realizes the online, measurement and automatic judgment of various data, provides performance early warning and process adjustment suggestions for operators, and has safe and convenient operation and higher efficiency. The operation is simple and convenient, the maintenance is easy, and the leakage is not required to be checked every day and the electrolyte is not required to be replaced regularly; the equipment has simple structure, does not contain components such as an electrolytic bath and the like, has small size and saves space.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a device and a method for in-situ online monitoring of the performance of a biological tank of a sewage treatment plant.
Background
In the prior art, the influence of temperature on a measurement result is mostly not considered when the performance of a biological pool of a sewage treatment plant is monitored, and actually, the metabolic activity of microorganisms can be increased by about 12% every time the sewage temperature rises by 1 ℃, so that the influence of the temperature on the sludge activity is considered to be necessary. In order to ensure the accuracy of the detection result, heating and heat-preserving equipment can be adopted to maintain the temperature of the reaction system consistent with the detection environment, but the overall complexity and the performance stability risk of the equipment are increased.
In addition, in the prior art, the dissolved oxygen of the reactor is often increased by using a method of directly aerating by using a gas distributor, but the aeration oxygenation efficiency is too low if the aperture of the gas distributor is too large, and the pollution and blockage are easily caused if the aperture of the gas distributor is too small, so that the measurement of the subsequent reaction time is influenced. When the frequency conversion parameters of the blower are utilized to evaluate the performance of the activated sludge, if the aeration pipeline is too long in the actual working condition, the reference significance of the frequency conversion value is not good, the measurement area is often special, and the correlation between the measurement area and the aeration state is often deviated, so that the frequency conversion curve of the blower under the condition cannot represent the activated state of the sludge in the biological pond.
In the existing detection method, the MLSS at the tail end is not representative, the MLSS of the aeration tank body is distributed in a gradient manner, only water is taken out, the whole value cannot be represented, the measured value is not easy to realize stability, the data is greatly deviated from the actual value within a long time (more than 100 min) of measurement, and the measurement precision is poor even after the measurement is stable.
Stirring in the existing reaction system usually uses stirring shaft mechanical stirring and non-contact electromagnetic stirring, but stirring shaft mechanical stirring has higher requirements on the sealing property and the corrosion resistance of a stirring shaft, and the stirring magneton stability of electromagnetic stirring is poor, so that the stirring function is easily lost once impacted by water flow.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a device and a method for in-situ online monitoring of the performance of a biological tank of a sewage treatment plant.
In order to achieve the purpose, the invention adopts the following technical scheme:
the device for in-situ online monitoring of the performance of the biological pond of the sewage treatment plant comprises a water inlet system, a reaction system, a temperature detection and maintenance system, a data detection system, a logic control and data processing system and a feed liquid quantitative supplement system;
the water inlet system comprises a water inlet pump, a first electric control three-way valve, a second electric control three-way valve, a water inlet pipeline and a water outlet pipeline;
the reaction system comprises a jacket reaction tube, an internal reflux pump, a jet water pump, a jet oxygenator, an automatic sample reserving device and an air pressure balance tube;
the temperature detection and maintenance system comprises an environment temperature detection electrode and a temperature detection electrode in the reactor;
the data detection system comprises a dissolved oxygen detection electrode and a pH detection electrode;
the logic control and data processing system comprises a logic controller and a display;
the feed liquid quantitative supplement system comprises a feed liquid storage bottle, a feed liquid extraction pump, a quantifying bottle and a feed liquid feeding pump;
the water inlet pipeline is connected with a water inlet pump, the jacket reaction tube comprises an inner reaction bottle and an outer jacket, and the outer jacket is arranged outside the inner reaction bottle in a surrounding manner; an inner water inlet interface and an inner water outlet interface are arranged on the inner reaction bottle, an outer water inlet interface and an outer water outlet interface are arranged on the outer jacket, the inner water inlet interface and the outer water inlet interface are respectively communicated with a water inlet pipeline, a first electric control three-way valve is arranged between the inner water inlet interface and the water inlet pipeline, the inner water outlet interface and the outer water outlet interface are respectively communicated with a water outlet pipeline, a second electric control three-way valve is arranged between the inner water outlet interface and the water outlet pipeline, and a jet water pump and a jet oxygenator are arranged on a jet pipeline connecting the first electric control three-way valve and the second electric control three-way valve; the dissolved oxygen detection electrode, the pH detection electrode and the temperature detection electrode in the reactor respectively detect corresponding parameters in the inner reaction bottle, and an air pressure balance pipe is arranged between the inner reaction bottle and the outside; a return pipeline is arranged on the inner reaction bottle, and a return water pump is arranged in the return pipeline; the environment temperature detection electrode, the temperature detection electrode in the reactor, the pH detection electrode and the dissolved oxygen detection electrode are respectively connected with a logic controller, the logic controller controls all the components to work, and the logic controller is connected with a display; the feed liquid storage bottle is connected with the quantifying bottle through an extraction pipeline, a feed liquid extraction pump is arranged on the extraction pipeline, the quantifying bottle is connected with the inner reaction bottle through a feeding pipeline, a feed liquid feeding pump is arranged on the feeding pipeline, and an overflow pipeline is also arranged between the quantifying bottle and the feed liquid storage bottle.
The technical scheme can also adopt the following technical measures:
the opening of the feeding pipeline inserted into the quantitative bottle is positioned at the bottom of the quantitative bottle, and the opening of the overflow pipeline in the quantitative bottle is arranged at the top of the quantitative bottle.
The device for in-situ online monitoring of the performance of the biological pond of the sewage treatment plant further comprises a cloud data management and comprehensive analysis system, and the cloud data management and comprehensive analysis system comprises a cloud upper computer; and the cloud end upper computer is in data connection with the logic controller.
The distance between the water inlet of the water inlet pipeline and the water outlet of the water outlet pipeline in the biological pond is at least 1 meter.
The method for in-situ on-line monitoring of the performance of the biological pond of the sewage treatment plant comprises the following steps:
A. the device is started, the temperature in the biological pond is detected to be T11 by the environment temperature detection electrode, the temperature in the reaction bottle in the temperature detection electrode detection in the reactor is T10, the pH value of the mixed liquid in the reaction bottle is detected to be pH9 by the pH detection electrode, the dissolved oxygen value of the mixed liquid in the reaction bottle is detected to be DO8 by the dissolved oxygen detection electrode, and the time parameter real-time curves of T11, T10, DO8 and pH9 are respectively displayed by a display screen connected with the logic controller;
B. the water inlet pump is started, liquid in the biological pond flows into an outer jacket of the jacket reaction tube from an outer water inlet interface along a water inlet pipeline, flows out from an outer water outlet interface and flows back to the biological pond through a water outlet pipeline, and the liquid circularly flows between the outer jacket and the biological pond to ensure that the temperature in the outer jacket is the same as the temperature in the biological pond;
C. the pre-flushing is started, the first electric control three-way valve is communicated with the water inlet pipeline and the internal water inlet interface, the second electric control three-way valve is communicated with the internal water outlet interface and the water outlet pipeline, the water inlet pump operates to guide the sewage and activated sludge mixed liquid in the biological pond into the internal reaction bottle;
D. after the inner reaction bottle is communicated with the biological pond, the inner reflux pump starts to operate after a set time period t 1;
E. the first electric control three-way valve cuts off the connection between the water inlet interfaces in the water inlet pipeline, the second electric control three-way valve cuts off the connection between the inner water outlet interface and the water outlet pipeline, the jet flow pipeline is communicated between the inner water inlet interface and the inner water outlet interface through the first electric control three-way valve and the second electric control three-way valve, the jet flow water pump is started, and the jet flow water pump is closed after the set time length t2 of operation;
F. the first electric control three-way valve and the second electric control three-way valve are closed, at the moment, the first electric control three-way valve, the reaction bottle in the jacket reaction tube, the second electric control three-way valve, the jet flow oxygenator and the jet flow water pump are disconnected, the logic controller performs feedback control on the operation of the water inlet pump according to T11 acquired by the environment temperature detection electrode and T10 acquired by the temperature detection electrode in the reactor, and the difference value between T10 and T11 is maintained within a set value T0;
G. opening a first electric control three-way valve and a second electric control three-way valve, wherein the first electric control three-way valve, a reaction bottle in a jacket reaction tube, the second electric control three-way valve, the jet oxygenator and the jet water pump are communicated in a loop way, and the set opening time is t 2;
H. the first electric control three-way valve is used for cutting off the connection between water inlet interfaces in the water inlet pipeline, the second electric control three-way valve is used for cutting off the connection between an inner water outlet interface and the water outlet pipeline, the inner water inlet interface and the inner water outlet interface are communicated with a jet pipeline through the first electric control three-way valve and the second electric control three-way valve, whether the pH9 exceeds a set threshold value pH 01-pH 02 or not is judged, if the pH exceeds the threshold value, the logic controller 17 sends out a pH early warning, the display screen device and the cloud upper computer are used for simultaneously prompting, and meanwhile, the automatic sample reserving device is started for reserving samples;
I. starting the jet flow water pump, and closing the jet flow water pump after the set operation time period t 3;
J. the logic controller performs feedback control on the running of the jet water pump according to the dissolved oxygen value DO8 acquired by the dissolved oxygen detection electrode, and the jet water pump is closed after DO8 reaches a set value DO 1;
K. the operation of the feed liquid extraction pump is set for a time period t 4;
l, the operation set time period t5 of the feed liquid adding pump;
m, judging whether the dissolved oxygen value D08 acquired by the dissolved oxygen detection electrode reaches a set value DO2 by the logic controller, and recording the time t01 and the corresponding DO3 at the time after the dissolved oxygen value D08 reaches the set value DO 2; judging whether the dissolved oxygen value D08 reaches a set value DO4 every 5-10 s, recording the time t02 and the DO5 corresponding to the time after the dissolved oxygen value D08 reaches the set value DO4, recording data and drawing a real-time image; storing DO3, DO5, t02, t 01;
n, calculating area integrals A of t02 and t01 in the DO-t function image, judging whether the range A exceeds a set value A0 or not, wherein A0 is a function of time and temperature, if the range A exceeds the set value, the logic controller sends out early warning, prompts through a display and a cloud upper computer, and simultaneously starts a sample retention relay to retain samples;
o, A0, the calculation method comprises: recording F (T, T) as a fitting function of the annual OUR value and time temperature of the sewage treatment plant in the area to be measured, namely A0 is equal to F (T, T) x T, measuring the OUR at different times throughout the year, measuring the corresponding temperature and month, and fitting by a least square method of a mathematical tool to obtain the OUR; or when the measuring region lacks corresponding historical data, obtaining a0 by referring to the following empirical formula:
F(T,t)＝60×OUR×θ(T-20)
when T is more than or equal to 20 ℃, theta is 1.05; when T is less than 20 ℃, theta is 1.07; wherein OUR is the temporarily measured activated sludge oxygen consumption rate;
p, after the time delay setting time is t6, a first electric control three-way valve and a second electric control three-way valve are opened, the first electric control three-way valve, a reaction bottle in a jacket reaction tube, the second electric control three-way valve, a jet flow oxygenator and a jet flow water pump are connected in a loop mode, a water inlet pump is started, a reflux water pump is started after the water inlet pump runs for the setting time t2, the reflux water pump is closed after the reflux water pump runs for the setting time t3, and the water inlet pump is closed after the setting time t 6;
and Q, finishing the detection, recording the detection times as N, judging whether the N is equal to a set value N0, stopping the detection if the N is N0, resetting the N to be 0, returning to the step B to perform the next detection if the N does not reach N0, and enabling the next detection to correspond to N to be N + 1.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the device and the method for in-situ online monitoring of the performance of the biological tank of the sewage treatment plant can lead a sewage treatment operator to obtain the running state of the biological tank in a short time by quickly and directly measuring the performance of the activated sludge. In addition, the device does not need to be attended by a special person, the device and the detection sensor are cleaned through the logic controller, the reaction system is kept the same as the actual temperature, various data are online, measured and automatically judged, performance early warning and process adjustment suggestions are provided for an operator, the operation is safe and convenient, and the efficiency is high. The operation is simple and convenient, the maintenance is easy, and the leakage does not need to be checked every day and the electrolyte does not need to be replaced regularly; the device has simple structure, does not contain components such as an electrolytic bath and the like, has small size and saves space.
Drawings
FIG. 1 is a schematic structural diagram of an in-situ online monitoring device for biological pond performance of a sewage treatment plant according to the invention;
FIG. 2 is a flow chart of the method for in-situ on-line monitoring of the performance of a biological pond of a sewage treatment plant according to the present invention;
FIG. 3 is a schematic of a time-dependent curve of a background value parameter in wastewater;
FIG. 4 is a schematic of a time-dependent curve of an activated sludge parameter;
FIG. 5 is a graph showing the time-dependent parameter profile of feed solution delivery;
FIG. 6 is a schematic of a time-dependent curve of the parameters after addition of heavy metal ions;
FIG. 7 is a graph illustrating the test repeated multiple times.
Detailed Description
The present invention is explained in detail by the following examples, which are disclosed for the purpose of protecting all technical improvements within the scope of the present invention.
As shown in fig. 1 and 2, the device for in-situ on-line monitoring the performance of the biological pond of the sewage treatment plant comprises a water inlet system, a reaction system, a temperature detection and maintenance system, a data detection system, a logic control and data processing system and a feed liquid quantitative supplement system;
the water inlet system comprises a water inlet pump 1, a first electric control three-way valve 3, a second electric control three-way valve 4, a water inlet pipeline and a water outlet pipeline;
the reaction system comprises a jacket reaction tube 2, an internal reflux pump 5, a jet water pump 6, a jet oxygenator 7, an automatic sample reserving device and a pressure balancing tube 16;
the temperature detection and maintenance system comprises an environment temperature detection electrode 11 and a reactor temperature detection electrode 10;
the data detection system comprises a dissolved oxygen detection electrode 8 and a pH detection electrode 9;
the logic control and data processing system includes a logic controller 17 and a display 18;
the feed liquid quantitative supplement system comprises a feed liquid storage bottle 15, a feed liquid extraction pump 12, a quantification bottle 14 and a feed liquid feeding pump 13;
the water inlet pipeline is connected with a water inlet pump, the jacket reaction tube comprises an inner reaction bottle and an outer jacket, and the outer jacket is arranged outside the inner reaction bottle in an enclosing manner; an inner water inlet interface and an inner water outlet interface are arranged on the inner reaction bottle, an outer water inlet interface and an outer water outlet interface are arranged on the outer jacket, the inner water inlet interface and the outer water inlet interface are respectively communicated with a water inlet pipeline, a first electric control three-way valve is arranged between the inner water inlet interface and the water inlet pipeline, the inner water outlet interface and the outer water outlet interface are respectively communicated with a water outlet pipeline, a second electric control three-way valve is arranged between the inner water outlet interface and the water outlet pipeline, and a jet flow water pump and a jet flow oxygenator are arranged on a jet flow pipeline connected with the first electric control three-way valve and the second electric control three-way; the dissolved oxygen detection electrode, the pH detection electrode and the temperature detection electrode in the reactor respectively detect corresponding parameters in the inner reaction bottle, and an air pressure balance pipe is arranged between the inner reaction bottle and the outside; a return pipeline is arranged on the inner reaction bottle, and a return water pump is arranged in the return pipeline; the environment temperature detection electrode, the temperature detection electrode in the reactor, the pH detection electrode and the dissolved oxygen detection electrode are respectively connected with a logic controller, the logic controller controls all the components to work, and the logic controller is connected with a display; the feed liquid storage bottle is connected with the dosing bottle through an extraction pipeline, a feed liquid extraction pump is arranged on the extraction pipeline, the dosing bottle is connected with the inner reaction bottle through a dosing pipeline, a feed liquid dosing pump is arranged on the dosing pipeline, and an overflow pipeline is further arranged between the dosing bottle and the feed liquid storage bottle.
The opening of the feeding pipeline corresponding to the quantitative bottle is positioned at the bottom of the quantitative bottle, and the opening of the return pipeline corresponding to the quantitative bottle is arranged at the top of the quantitative bottle. The feed liquid extraction pump can continuously supply feed liquid into the quantitative bottle to be full of every time when the feed liquid extraction pump operates and overflow from the overflow pipeline, the feeding pump conveys the feed liquid in the quantitative bottle to the inner reaction bottle when feeding, and the feeding pump operates until the feed liquid does not flow out from the quantitative bottle any more, so that the feed liquid amount fed into the inner reaction bottle at every time can be accurately controlled.
The device for in-situ online monitoring of the performance of the biological pond of the sewage treatment plant further comprises a cloud data management and comprehensive analysis system, and the cloud data management and comprehensive analysis system comprises a cloud end upper computer; the cloud end upper computer is in data connection with the logic controller, and the cloud end upper computer can receive, store and analyze detected values, perform system management on the detected data and send out early warning prompts.
The distance between the water inlet of the water inlet pipeline and the water outlet of the water outlet pipeline in the biological pond is at least 1 meter, so that the influence of the detection of the discharged liquid in the previous batch on water inlet sampling is reduced.
As shown in FIG. 3, the method for in-situ on-line monitoring the performance of the biological pond of the sewage treatment plant comprises the following steps:
A. the device is started, the temperature in the biological pond is detected to be T11 by the environment temperature detection electrode, the temperature in the reaction bottle in the temperature detection electrode detection in the reactor is T10, the pH value of the mixed liquid in the reaction bottle is detected to be pH9 by the pH detection electrode, the dissolved oxygen value of the mixed liquid in the dissolved oxygen detection electrode detection reaction bottle is DO8, and the time parameter real-time curves of T11, T10, DO8 and pH9 are respectively displayed by a display screen connected with the logic controller;
B. the water inlet pump is started, liquid in the biological pond flows into an outer jacket of the jacket reaction tube from an outer water inlet interface along a water inlet pipeline, flows out from an outer water outlet interface and flows back to the biological pond through a water outlet pipeline, and the liquid circularly flows between the outer jacket and the biological pond to ensure that the temperature in the outer jacket is the same as the temperature in the biological pond;
C. the pre-flushing is started, the first electric control three-way valve 3 is communicated with a water inlet pipeline and an internal water inlet interface, the second electric control three-way valve 4 is communicated with an internal water outlet interface and a water outlet pipeline, a water inlet pump runs, and the mixed liquid of sewage and active sludge in the biological pond is led into an internal reaction bottle;
D. after the inner reaction bottle is communicated with the biological pond, the inner reflux pump 5 starts to operate after a set time period t 1;
E. the first electric control three-way valve cuts off the connection between the water inlet interfaces in the water inlet pipeline, the second electric control three-way valve cuts off the connection between the inner water outlet interface and the water outlet pipeline, the jet flow pipeline is communicated between the inner water inlet interface and the inner water outlet interface through the first electric control three-way valve and the second electric control three-way valve, the jet flow water pump is started, and the jet flow water pump is closed after the operation is set for a time period of t 2;
F. the first electric control three-way valve 3 and the second electric control three-way valve 4 are closed, at the moment, loops of the first electric control three-way valve 3, a reaction bottle in the jacket reaction tube (2), the second electric control three-way valve 4, the jet flow oxygenator 7 and the jet flow water pump 6 are disconnected, the logic controller carries out feedback control on the operation of the water inlet pump according to T11 acquired by the environment temperature detection electrode and T10 acquired by the temperature detection electrode in the reactor, and the difference value between T10 and T11 is maintained within a set value T0;
G. opening a first electric control three-way valve 3 and a second electric control three-way valve 4, and connecting loops of the first electric control three-way valve 3, a reaction bottle in the jacket reaction tube 2, the second electric control three-way valve 4, the jet oxygenator 7 and the jet water pump 6, wherein the set opening time is t 2;
H. the first electric control three-way valve is used for cutting off the connection between water inlet interfaces in the water inlet pipeline, the second electric control three-way valve is used for cutting off the connection between an inner water outlet interface and the water outlet pipeline, the inner water inlet interface and the inner water outlet interface are communicated with a jet pipeline through the first electric control three-way valve and the second electric control three-way valve, whether the pH9 exceeds a set threshold value pH 01-pH 02 or not is judged, if the pH exceeds the threshold value, the logic controller 17 sends out a pH early warning, the display and the cloud upper computer are used for simultaneously prompting, and meanwhile, the automatic sample retention device is started for sample retention;
I. starting the jet flow water pump, and closing the jet flow water pump after the set operation time period t 3;
J. the logic controller performs feedback control on the running of the jet water pump according to the dissolved oxygen value DO8 acquired by the dissolved oxygen detection electrode, and the jet water pump is closed after DO8 reaches a set value DO 1;
K. the operation of the feed liquid extraction pump is set for a time period t 4;
l, the operation set time period t5 of the feed liquid adding pump;
m, judging whether the dissolved oxygen value D08 acquired by the dissolved oxygen detection electrode reaches a set value DO2 by the logic controller, and recording the time t01 and the corresponding DO3 at the time after the dissolved oxygen value D08 reaches the set value DO 2; judging whether the dissolved oxygen value D08 reaches a set value DO4 every 5-10 s, recording the time t02 and the DO5 corresponding to the time after the dissolved oxygen value D08 reaches the set value DO4, recording data and drawing a real-time image; storing DO3, DO5, t02, t 01;
n, calculating area integrals A of t02 and t01 in the DO-t function image, judging whether the range A exceeds a set value A0 or not, wherein A0 is a function of time and temperature, if the range A exceeds the set value, the logic controller sends out early warning, prompts through a display and a cloud upper computer, and simultaneously starts a sample retention relay to retain samples;
o, A0, the calculation method comprises: recording F (T, T) as a fitting function of the annual OUR value and time temperature of the sewage treatment plant in the area to be measured, namely A0 is equal to F (T, T) x T, measuring the OUR at different times throughout the year, measuring the corresponding temperature and month, and fitting by a least square method of a mathematical tool to obtain the OUR; or when the measuring region lacks the corresponding historical data, obtaining A0 by referring to the following empirical formula:
F(T,t)＝60×OUR×θ(T-20)
when T is more than or equal to 20 ℃, theta is 1.05; when T is less than 20 ℃, theta is 1.07; wherein OUR is the temporarily measured activated sludge oxygen consumption rate;
p, after the time delay setting time length t6, opening a first electric control three-way valve 3 and a second electric control three-way valve 4, connecting a loop of the first electric control three-way valve 3, a reaction bottle in the jacket reaction tube 2, the second electric control three-way valve 4, a jet oxygenator 7 and a jet water pump 6, starting a water inlet pump, starting a reflux water pump after the water inlet pump operates for the setting time length t2, closing the reflux water pump after the reflux water pump operates for the setting time length t3, and closing the water inlet pump after the setting time length t 6;
and Q, finishing the detection, recording the detection times as N, judging whether the N is equal to a set value N0, stopping the detection if the N is N0, resetting the N to be 0, returning to the step B to perform the next detection if the N does not reach N0, and enabling the next detection to correspond to N to be N + 1.
In the above steps, t1, t2, t3, t4, t5 and t6 are all set values, t1, t2, t3, t4 and t5 are respectively 5-10 s, and t6 is 30-60 s.
Fig. 4 to 7 are graphs reflecting the time-dependent changes of various parameters, particularly dissolved oxygen and pH, in the implementation of the method for in-situ on-line monitoring of the performance of biological ponds of sewage treatment plants according to the invention. FIG. 7 reflects the consistency of the data obtained from each assay, evidencing the feasibility and accuracy of the method.
The invention is not described in detail in the prior art, and it is apparent to a person skilled in the art that the invention is not limited to details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to 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, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Claims (5)
1. A device for in-situ online monitoring of the performance of a biological pond of a sewage treatment plant is characterized by comprising a water inlet system, a reaction system, a temperature detection and maintenance system, a data detection system, a logic control and data processing system and a feed liquid quantitative supplement system;
the water inlet system comprises a water inlet pump (1), a first electric control three-way valve (3), a second electric control three-way valve (4), a water inlet pipeline and a water outlet pipeline;
the reaction system comprises a jacket reaction tube (2), an internal reflux pump (5), a jet water pump (6), a jet oxygenator (7), an automatic sample retention device and a pressure balancing tube (16);
the temperature detection and maintenance system comprises an environment temperature detection electrode (11) and a reactor temperature detection electrode (10);
the data detection system comprises a dissolved oxygen detection electrode (8) and a pH detection electrode (9);
the logic control and data processing system comprises a logic controller (17) and a display (18);
the feed liquid quantitative supplementing system comprises a feed liquid storage bottle (15), a feed liquid extraction pump (12), a quantitative bottle (14) and a feed liquid feeding pump (13);
the water inlet pipeline is connected with a water inlet pump, the jacket reaction tube comprises an inner reaction bottle and an outer jacket, and the outer jacket is arranged outside the inner reaction bottle in an enclosing manner; an inner water inlet interface and an inner water outlet interface are arranged on the inner reaction bottle, an outer water inlet interface and an outer water outlet interface are arranged on the outer jacket, the inner water inlet interface and the outer water inlet interface are respectively communicated with a water inlet pipeline, a first electric control three-way valve is arranged between the inner water inlet interface and the water inlet pipeline, the inner water outlet interface and the outer water outlet interface are respectively communicated with a water outlet pipeline, a second electric control three-way valve is arranged between the inner water outlet interface and the water outlet pipeline, and a jet flow water pump and a jet flow oxygenator are arranged on a jet flow pipeline connected with the first electric control three-way valve and the second electric control three-; the dissolved oxygen detection electrode, the pH detection electrode and the temperature detection electrode in the reactor respectively detect corresponding parameters in the inner reaction bottle, and an air pressure balance pipe is arranged between the inner reaction bottle and the outside; a return pipeline is arranged on the inner reaction bottle, and a return water pump is arranged in the return pipeline; the environment temperature detection electrode, the temperature detection electrode in the reactor, the pH detection electrode and the dissolved oxygen detection electrode are respectively connected with a logic controller, the logic controller controls all the components to work, and the logic controller is connected with a display; the feed liquid storage bottle is connected with the quantifying bottle through an extraction pipeline, a feed liquid extraction pump is arranged on the extraction pipeline, the quantifying bottle is connected with the inner reaction bottle through a feeding pipeline, a feed liquid feeding pump is arranged on the feeding pipeline, and an overflow pipeline is also arranged between the quantifying bottle and the feed liquid storage bottle.
2. The in-situ on-line monitoring device for the performance of the biological pond of the sewage treatment plant according to claim 1, is characterized in that: the opening of the feeding pipeline inserted into the quantitative bottle is positioned at the bottom of the quantitative bottle, and the opening of the overflow pipeline in the quantitative bottle is arranged at the top of the quantitative bottle.
3. The device for in-situ on-line monitoring of the performance of the biological pond of the sewage treatment plant according to claim 1 or 2, is characterized in that: the cloud data management and comprehensive analysis system comprises a cloud end upper computer (19); and the cloud end upper computer is in data connection with the logic controller.
4. The in-situ on-line monitoring device for the performance of the biological pond of the sewage treatment plant according to claim 3, characterized in that: the distance between the water inlet of the water inlet pipeline and the water outlet of the water outlet pipeline in the biological pond is at least 1 meter.
5. A method for in-situ on-line monitoring of the performance of a biological pond of a sewage treatment plant comprises the following steps:
A. the device is started, the temperature in the biological pond is detected to be T11 by the environment temperature detection electrode, the temperature in the reaction bottle in the temperature detection electrode detection in the reactor is T10, the pH value of the mixed liquid in the reaction bottle is detected to be pH9 by the pH detection electrode, the dissolved oxygen value of the mixed liquid in the reaction bottle is detected to be DO8 by the dissolved oxygen detection electrode, and the time parameter real-time curves of T11, T10, DO8 and pH9 are respectively displayed by a display screen connected with the logic controller;
B. the water inlet pump is started, liquid in the biological pond flows into an outer jacket of the jacket reaction tube from an outer water inlet interface along a water inlet pipeline, flows out from an outer water outlet interface and flows back to the biological pond through a water outlet pipeline, and the liquid circularly flows between the outer jacket and the biological pond to ensure that the temperature in the outer jacket is the same as the temperature in the biological pond;
C. the pre-flushing is started, the first electric control three-way valve (3) is communicated with the water inlet pipeline and the internal water inlet interface, the second electric control three-way valve (4) is communicated with the internal water outlet interface and the water outlet pipeline, the water inlet pump operates to guide the sewage and activated sludge mixed liquid in the biological pond into the internal reaction bottle;
D. after the inner reaction bottle is communicated with the biological pond, the inner reflux pump (5) starts to operate after a set time period t 1;
E. the first electric control three-way valve cuts off the connection between the water inlet interfaces in the water inlet pipeline, the second electric control three-way valve cuts off the connection between the inner water outlet interface and the water outlet pipeline, the jet flow pipeline is communicated between the inner water inlet interface and the inner water outlet interface through the first electric control three-way valve and the second electric control three-way valve, the jet flow water pump is started, and the jet flow water pump is closed after the set operation time length t 2;
F. the first electric control three-way valve (3) and the second electric control three-way valve (4) are closed, at the moment, loops of the first electric control three-way valve (3), a reaction bottle in the jacket reaction tube (2), the second electric control three-way valve (4), the jet flow oxygenator (7) and the jet flow water pump (6) are disconnected, the logic controller carries out feedback control on the operation of the water inlet pump according to T11 acquired by the environment temperature detection electrode and T10 acquired by the temperature detection electrode in the reactor, and the difference value between T10 and T11 is maintained within a set value T0;
G. opening a first electric control three-way valve (3) and a second electric control three-way valve (4), wherein the first electric control three-way valve (3), a reaction bottle in the jacket reaction tube (2), the second electric control three-way valve (4), the jet flow oxygenator (7) and the jet flow water pump (6) are communicated in a loop way, and the set opening time is t 2;
H. the first electric control three-way valve is used for cutting off the connection between water inlet interfaces in the water inlet pipeline, the second electric control three-way valve is used for cutting off the connection between an inner water outlet interface and the water outlet pipeline, the inner water inlet interface and the inner water outlet interface are connected with a jet pipeline through the first electric control three-way valve and the second electric control three-way valve, whether the pH9 exceeds a set threshold value pH 01-pH 02 or not is judged, if the pH exceeds the threshold value, the logic controller 17 sends out a pH early warning, the display screen and the cloud upper computer are used for simultaneously prompting, and meanwhile, the automatic sample retention device is started for sample retention;
I. starting the jet flow water pump, and closing the jet flow water pump after the set operation time period t 3;
J. the logic controller performs feedback control on the running of the jet water pump according to the dissolved oxygen value DO8 acquired by the dissolved oxygen detection electrode, and the jet water pump 6 is closed after DO8 reaches a set value DO 1;
K. the operation of the feed liquid extraction pump is set for a time period t 4;
l, the operation set time period t5 of the feed liquid adding pump;
m, judging whether the dissolved oxygen value D08 acquired by the dissolved oxygen detection electrode reaches a set value DO2 by the logic controller, and recording the time t01 and the corresponding DO3 at the time after the dissolved oxygen value D08 reaches the set value DO 2; judging whether the dissolved oxygen value D08 reaches a set value DO4 every 5-10 s, recording time t02 and the DO5 corresponding to the time after the dissolved oxygen value D08 reaches the set value DO4, recording data and drawing a real-time image; storing DO3, DO5, t02, t 01;
n, calculating area integrals A of t02 and t01 in the DO-t function image, judging whether the range A exceeds a set value A0 or not, wherein A0 is a function of time and temperature, if the range A exceeds the set value, sending out early warning by a logic controller, prompting by a display and a cloud upper computer, and starting a sample retention relay to retain samples;
o, A0, the calculation method comprises: recording F (T, T) as a fitting function of the annual OUR value and time temperature of the sewage treatment plant in the area to be measured, namely A0 is equal to F (T, T) x T, measuring the OUR at different times throughout the year, measuring the corresponding temperature and month, and fitting by a least square method of a mathematical tool to obtain the OUR; or when the measuring region lacks corresponding historical data, obtaining a0 by referring to the following empirical formula:
F(T,t)＝60×OUR×θ(T-20)
when T is more than or equal to 20 ℃, theta is 1.05; when T is less than 20 ℃, theta is 1.07; wherein OUR is the temporarily measured activated sludge oxygen consumption rate;
p, after the time delay setting time length t6, opening a first electric control three-way valve (3) and a second electric control three-way valve (4), connecting loops of the first electric control three-way valve (3), a reaction bottle in a jacket reaction tube (2), the second electric control three-way valve (4), a jet flow oxygenator (7) and a jet flow water pump (6), starting a water inlet pump, starting a reflux water pump after the water inlet pump operates for the setting time length t2, closing the reflux water pump after the reflux water pump operates for the setting time length t3, and closing the water inlet pump after the setting time length t 6;
and Q, finishing the detection, recording the detection times as N, judging whether the N is equal to a set value N0, stopping the detection if the N is N0, resetting the N to be 0, returning to the step B to perform the next detection if the N does not reach N0, and enabling the next detection to correspond to N to be N + 1.
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| CN117706055A (en) * | 2024-02-06 | 2024-03-15 | 天津创业环保集团股份有限公司 | Integrated method and device for analyzing organic matter full-component characteristics of municipal sewage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117706055A (en) * | 2024-02-06 | 2024-03-15 | 天津创业环保集团股份有限公司 | Integrated method and device for analyzing organic matter full-component characteristics of municipal sewage |
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