CN111039404B - Device and method for automatically monitoring biological sludge activity based on multiple parameters - Google Patents

Device and method for automatically monitoring biological sludge activity based on multiple parameters Download PDF

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CN111039404B
CN111039404B CN201911286139.6A CN201911286139A CN111039404B CN 111039404 B CN111039404 B CN 111039404B CN 201911286139 A CN201911286139 A CN 201911286139A CN 111039404 B CN111039404 B CN 111039404B
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CN111039404A (en
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宋英豪
李思安
袁衍超
严夏
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Heros Beijing Environment Technology Co ltd
Beijing University of Chemical Technology
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/00—Controlling or monitoring parameters in water treatment
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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
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Abstract

The invention discloses a device and a method for automatically monitoring biological sludge activity based on multiple parameters, belonging to the technical field of sewage treatment. The device for automatically monitoring the biological sludge activity based on the multiple parameters comprises a pre-aeration system, a mixed reaction system, a measuring system and a control and data processing system, wherein the mixed reaction system is respectively connected with the pre-aeration system and the measuring system; the control and data processing system controls all movable parts of the pre-aeration system, the mixed reaction system and the measuring system and collects and processes data on line. By the device and the method for automatically monitoring the activity of the biological sludge based on multiple parameters, the respiration rate can be measured on line 24 hours all day long, the nitrification activity and the denitrification activity of the activated sludge are represented, the activity change conditions of nitrifying bacteria and denitrifying bacteria in the biological sludge can be known more intuitively, and a basis is provided for controlling the nitrification and denitrification processes in an activated sludge treatment system.

Description

Device and method for automatically monitoring biological sludge activity based on multiple parameters
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a device and a method for automatically monitoring biological sludge activity based on multiple parameters.
Background
The sewage treatment system mainly treats activated sludge, and the traditional biological denitrification process is mostly adopted to reduce the concentration of the nitride in the effluent. The principle of the biological denitrification process is that ammonia nitrogen is converted into nitrate nitrogen through the growth and metabolic activities of microorganisms, and then the nitrate nitrogen is converted into nitrogen to be removed from water. The former is called nitration process, mainly occurs under aerobic condition, and needs oxygen supply as electron acceptor; the latter, known as the denitrification process, occurs in an anoxic environment, requiring an organic carbon source as an electron donor. The nitrification and denitrification processes are coordinated, so that the smooth proceeding of biological denitrification can be guaranteed.
In order to solve the problems, the existing process needs to be improved and the operation management needs to be improved, and the process monitoring of nitrification and denitrification of a sewage treatment system needs to be increased so as to be convenient to control.
At present, a sewage treatment system usually uses ammonia nitrogen concentration, nitrate nitrogen concentration and total nitrogen concentration of inlet and outlet water as indexes for judging treatment efficiency, and usually uses Mixed Liquor Suspended Solids (MLSS), sludge sedimentation ratio (SV) and sludge index: and the Sludge Volume Index (SVI) and the Sludge Density Index (SDI) are used as performance indexes of the activated sludge. Because the microbial community in the activated sludge treatment system is very complex, the biochemical reaction process is nonlinear and changeable, and the activity change conditions of the nitrifying bacteria and the denitrifying bacteria in the biological sludge cannot be comprehensively and accurately reflected according to the traditional sludge indexes, the judgment method not only consumes long time and has hysteresis, but also cannot comprehensively reflect the activity and the degradation capability of the nitrifying bacteria and the denitrifying bacteria, and the control strategy based on the judgment method has blindness. The sewage treatment system has poor treatment effect and low efficiency by using the judging method and the traditional sludge index, and the actual state of the activated sludge cannot be reflected.
Disclosure of Invention
In order to solve the problems, the invention provides a device and a method for automatically monitoring the activity of biological sludge based on multiple parameters, which can accurately measure the respiration rate and represent the nitrification activity and the denitrification activity of activated sludge. The activity change conditions of nitrifying bacteria and denitrifying bacteria in the biological sludge can be more intuitively understood through the nitrification activity and the denitrification activity, and a basis is provided for controlling the nitrification and denitrification processes in the activated sludge treatment system.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an apparatus for automatically monitoring biological sludge activity based on multiple parameters, comprising: the system comprises a pre-aeration system, a mixed reaction system, a measuring system and a control and data processing system, wherein the mixed reaction system is respectively connected with the pre-aeration system and the measuring system; the control and data processing system controls the work of the pre-aeration system, the mixed reaction system and the measuring system and collects data on line.
Furthermore, the pre-aeration system comprises a pre-aeration chamber, two three-way miniature electric valves, a peristaltic pump and an aeration pump; one of the two three-way miniature electric valves is respectively connected with the peristaltic pump, tap water and a sample inlet of the pre-aeration chamber, and the other three-way miniature electric valve is respectively connected with the mixing reaction chamber, a system sludge discharge port and a sludge discharge port of the pre-aeration chamber; the peristaltic pump conveys sludge or tap water in a secondary sedimentation tank of a sewage plant to the pre-aeration chamber; the aeration pump is arranged in the pre-aeration chamber.
Furthermore, the mixing reaction system comprises a mixing reaction chamber, two three-way miniature electric valves, a flow valve, a safety valve, four peristaltic pumps, an aeration pump, a magnetic stirrer and two reagent boxes; one of the two three-way miniature electric valves is respectively connected with the raw water, the secondary sedimentation tank of the sewage plant and one of the four peristaltic pumps, the peristaltic pumps convey the raw water or the supernatant of the secondary sedimentation tank of the sewage plant to the mixing reactor, and the other three-way miniature electric valve is respectively connected with the measuring chamber, the system sludge discharge port and the sludge discharge port of the mixing reaction chamber; the flow valve conveys tap water to the mixing reaction chamber at a set flow rate; the safety valve is arranged at the top of the mixing reaction chamber; the other peristaltic pump in the four peristaltic pumps conveys sludge in the pre-aeration chamber to the mixing reaction chamber; the aeration pump is arranged in the mixing reaction chamber; the magnetons of the magnetic stirrer are arranged in the mixing reaction chamber; the other two peristaltic pumps in the four peristaltic pumps respectively pump NaClO in the two medicament boxes3The solution and the ATU solution are continuously fed into the mixing reaction chamber.
Furthermore, the measuring system comprises a measuring chamber, a three-way micro electric valve, a two-way micro electric valve, a peristaltic pump, a safety valve, an overflow port, a magnetic stirrer, an online dissolved oxygen meter, a sludge concentration measuring instrument and a nitrate nitrogen measuring instrument; the three-way micro electric valve is respectively connected with the peristaltic pump, tap water and a sample inlet of the measuring chamber; the two-way miniature electric valve is respectively connected with a measuring chamber sludge discharge port and a system sludge discharge port; the peristaltic pump conveys the muddy water mixture or tap water in the mixing reaction chamber to the measuring chamber; the safety valve is arranged at the top of the measuring chamber; the overflow port is arranged on the side wall of the measuring chamber; the magnetons of the magnetic stirrer are arranged in the measuring chamber; the online dissolved oxygen instrument is arranged in the middle part in the measuring chamber; wherein, the respiration rate, the sludge concentration and the nitrate nitrogen concentration are all measured in the measuring system.
Further, the control and data processing system includes an industrial control computer and an I/O module; the industrial control computer is provided with four RS485 interfaces, the data output ends of the online dissolved oxygen probe, the online nitrate nitrogen probe and the online sludge concentration probe are connected with the four RS485 interfaces of the industrial control computer, and corresponding data are acquired by adopting a Modbus RTU protocol; a data processing program required by the measurement process is set in the industrial control computer, so that real-time display of data, historical data storage and reaction flow control can be realized; and the I/O module outputs action signals sent by the industrial control computer to the peristaltic pump, the aeration pump, the magnetic stirrer, the electric ball valve and the safety valve to control the work of the peristaltic pump, the aeration pump, the magnetic stirrer, the electric ball valve and the safety valve.
A method for automatically monitoring biological sludge activity based on multiple parameters is applied to the device for automatically monitoring biological sludge activity based on multiple parameters, and comprises the following steps:
step 1, conveying sludge of a secondary sedimentation tank of a sewage plant to a pre-aeration chamber and aerating;
step 2, measuring the sludge concentration of a secondary sedimentation tank and an aeration tank of the sewage plant by using a sludge concentration meter;
step 3, continuously conveying the sludge subjected to aeration for 12 hours in the pre-aeration chamber to a mixing reaction chamber and aerating, continuously conveying the activated sludge in the mixing reaction chamber to a measuring chamber and stirring, continuously measuring the dissolved oxygen value of the mud-water mixture after the mixing reaction chamber and the measuring chamber are filled, calculating the endogenous respiration rate, and setting a calculation program in an industrial control computer;
step 4, exhausting and cleaning the mixed reaction chamber and the measuring chamber;
step 5, continuously conveying the pre-aerated sludge and the raw water to a mixing reaction chamber for aeration, continuously conveying the sludge-water mixture in the mixing reaction chamber to a measuring chamber for stirring, continuously measuring the dissolved oxygen value of the sludge-water mixture after the mixing reaction chamber and the measuring chamber are filled, calculating the actual respiratory rate, and setting the calculation program in an industrial control computer;
step 6, adding a nitrification inhibitor NaClO3And transmitting ATU to the mixing reaction chamber, continuously measuring dissolved oxygen value of the slurry mixture, calculating actual respiratory rate after adding medicine, and OUR before adding medicine0And the stable respiration rate OUR after adding medicineSuppression ofThe difference value of (a) is the nitrification activity;
step 7, draining and cleaning the mixing reaction chamber and the measuring chamber, measuring the initial concentration CN-0 of the nitrate nitrogen in the supernatant of the secondary sedimentation tank of the sewage plant, continuously conveying the sludge of the pre-aeration chamber and the supernatant of the secondary sedimentation tank added with the carbon source to the mixing reaction chamber and stirring, continuously conveying the mud-water mixture of the mixing reaction chamber to the measuring chamber and stirring, and continuously collecting the concentration C of the nitrate nitrogen at the overflow portN-tCalculating the absolute value of the slope, namely the denitrification rate, in the control and data processing system by utilizing a calculation program;
8, draining and cleaning the mixed reaction chamber and the measuring chamber after the collection is finished;
repeating the steps 2-8 to measure various respiration rates of the activated sludge treatment system on line, and calculating the nitrification activity and the denitrification activity according to the measured data.
Further, according to the steps 1-8, the nitrification activity and the denitrification activity of the activated sludge are automatically measured in sequence or one index is detected on line.
The invention has the following beneficial effects:
the invention can realize 24h unattended operation and automatically carry out data measurement on the sludge activity of the activated sludge treatment system all day. The method comprises the steps of representing the nitrification activity and the denitrification activity of the activated sludge by measuring the respiration rate on line, and making a regulation and control strategy by using the data measured on line to optimize the treatment efficiency of the activated sludge treatment system.
Drawings
Fig. 1 is a schematic structural diagram of a device for automatically monitoring biological sludge activity based on multiple parameters, wherein:
1-a pre-aeration system, 11-a pre-aeration chamber, P11-a peristaltic pump, P12-an aeration pump, F11-an upper end three-way miniature electric valve and F12-a lower end three-way miniature electric valve;
2-mixed reaction system, 21-mixed reaction chamber, 22-magnetic stirring, 23-flow valve, 24-medicament box, 25-safety valve, P21-sludge peristaltic pump, P22-water sample peristaltic pump, P23-NaClO3The system comprises a peristaltic pump, a P24-ATU peristaltic pump, a P25-aeration pump, an F21-upper end three-way miniature electric valve and an F22-lower end three-way miniature electric valve;
3-measuring system, 31-measuring chamber, 32-online dissolved oxygen instrument, 33-safety valve, 34-overflow port, 35-magnetic stirrer, 37-online sludge concentration measuring instrument, 38-online nitrate nitrogen measuring instrument, P31-mixture peristaltic pump, F31-upper end three-way miniature electric valve, F32-lower end two-way miniature electric valve;
4-control and data processing system, 41-industrial control computer, 42-I/O module.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes in detail an apparatus and method for automatically monitoring biological sludge activity based on multiple parameters, which is provided by the present invention, with reference to the following examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, an apparatus for automatically monitoring biological sludge activity based on multiple parameters comprises: a pre-aeration system 1, a mixed reaction system 2, a measuring system 3 and a control and data processing system 4. The mixed reaction system 2 is respectively connected with the pre-aeration system 1 and the measuring system 3; the control and data processing system 4 controls all movable parts of the pre-aeration system 1, the mixed reaction system 2 and the measuring system 3 and collects data on line.
The pre-aeration system 1 comprises a pre-aeration chamber 11, an upper three-way miniature electric valve F11, a lower three-way miniature electric valve F12, a peristaltic pump P11 and an aeration pump P12. The upper three-way miniature electric valve F11 is respectively connected with a peristaltic pump P11, tap water and a sample inlet of the pre-aeration chamber 11, and the lower three-way miniature electric valve F12 is respectively connected with a mixing reaction chamber 21, a system sludge outlet and a sludge outlet of the pre-aeration chamber 11. The peristaltic pump P11 is used for conveying secondary sedimentation tank sludge or tap water to the pre-aeration chamber 11; an aeration pump P12 is disposed in the pre-aeration chamber 11.
The mixing reaction system comprises a mixing reaction chamber 21, a magnetic stirrer 22, a flow valve 23, two reagent boxes 24, a safety valve 25, a sludge peristaltic pump P21, a water sample peristaltic pump P22 and NaClO3Peristaltic pump P23, ATU peristaltic pump P24, aeration pump P25, upper end three-way miniature electric valve F21, lower extreme three-way miniature electric valve F22. The upper three-way miniature electric valve F21 is respectively connected with the raw water tank, the secondary sedimentation tank and the water sample peristaltic pump P22, and the lower three-way miniature electric valve F22 is respectively connected with the measuring chamber 31, the system sludge discharge port and the mixed reaction chamber 21 sludge discharge port. The flow valve 23 delivers tap water to the mixing reaction chamber 21 at a specific flow rate; a safety valve 25 is provided at the top of the mixing reaction chamber 21. A peristaltic sludge pump P21 delivers the pre-aeration chamber 11 sludge to the mixing reaction chamber 21. The aeration pump P25 is arranged in the mixing reaction chamber 21; the magnetons of the magnetic stirrer 22 are placed in the mixing reaction chamber 21. NaClO is respectively arranged in the two medicament boxes3And ATU solution, NaClO3The peristaltic pump P23 and the ATU peristaltic pump P24 respectively pump NaClO3The solution and the ATU solution are continuously fed into the mixing reaction chamber 21.
The measuring system comprises a measuring chamber 31, an online dissolved oxygen meter 32, a safety valve 33, an overflow port 34, a magnetic stirrer 36, a sludge concentration measuring instrument 37, a nitrate nitrogen measuring instrument 38, an upper three-way miniature electric valve F31, a lower two-way miniature electric valve F32 and a peristaltic pump P31. The upper end three-way miniature electric valve F31 is respectively connected with the peristaltic pump, tap water and the sample inlet of the measuring chamber 31; the lower end two-way miniature electric valve F32 is respectively connected with a mud discharging port of the measuring chamber 31 and a system mud discharging port. The peristaltic pump P31 delivers the muddy water mixture or the tap water in the mixing reaction chamber 21 to the measuring chamber 31; the safety valve 33 is disposed at the top of the measuring chamber 31; the overflow port 34 is arranged on the side wall of the measuring chamber 31 and is used for ensuring that the water sample in the measuring chamber 31 does not exceed 0.8L; the magnetons of the magnetic stirrer 36 are placed in the measuring chamber 31; the online dissolved oxygen instrument 32 is arranged in the middle part of the measuring chamber 31; wherein, the respiration rate, the sludge concentration and the nitrate nitrogen concentration are all measured in the measuring system.
The control and data processing system includes an industrial control computer 41 and an I/O module 42. The industrial control computer 41 is provided with four RS485 interfaces, the data output ends of the online dissolved oxygen probe 32, the online sludge concentration probe 37 and the online nitrate nitrogen probe 38 are connected with the four RS485 interfaces of the industrial control computer 41, and corresponding data are acquired by adopting a Modbus RTU protocol. The industrial control computer 41 is provided with a data processing program required for the measurement process, and can realize functions such as real-time display of data, storage of historical data, reaction flow control and the like. The I/O module 42 outputs the action signal sent by the industrial control computer to the peristaltic pump, the aeration pump, the magnetic stirrer, the electric ball valve and the safety valve to control the work of the peristaltic pump, the aeration pump, the magnetic stirrer, the electric ball valve and the safety valve.
A method for automatically monitoring biological sludge activity based on multiple parameters is applied to the device for automatically monitoring biological sludge activity based on multiple parameters, the following steps 2-8 can be repeated to carry out on-line measurement on various respiratory rates of an activated sludge treatment system, and the nitrification activity and the denitrification activity are calculated according to measurement data, and the method comprises the following specific steps:
step 1, conveying the sludge in the secondary sedimentation tank to a pre-aeration chamber 11, opening P12 for aeration, and aerating the sludge in the secondary sedimentation tank for 12 hours to enable the sludge to enter an endogenous respiration state.
Step 2, measuring the concentration MLSS of the secondary sedimentation tank by using an online sludge concentration meter 371And the sludge concentration MLSS of the aeration tank2. Measuring every 4h, collecting for 5min at a frequency of 5 s/time, and collecting the MLSS obtained in the collecting period1、MLSS2As the measured value for that measurement period.
Step 3, continuously conveying the sludge of the secondary sedimentation tank after 12 hours of aeration of the pre-aeration tank to the mixing reaction chamber 21, and starting an aeration pump P25; then the peristaltic pump P31 is turned on, the activated sludge in the mixing reaction chamber 21 is continuously conveyed to the measuring chamber 31, and the magnetic stirrer 36 is turned on; after the mixing reaction chamber 21 and the measuring chamber 31 are filled, the safety valves 25 and 33 are closed, the dissolved oxygen value of the mud-water mixture is continuously measured after 5min of stabilization, and the acquisition frequency is 4 s/time; the respiration rate is measured at a frequency of 1 min/time, i.e., every 15 dissolved oxygen valuesThe breathing rate calculation program is set in the industrial control computer; wherein the flow rate of the peristaltic pump P31 is large or small
Figure GDA0002399508800000081
The flow rates of peristaltic pumps P11 and P21 are equal to P11, and Q is11＝Q21＝Q31。
Step 4, the mixing chamber 21 and the measuring chamber 31 are drained and cleaned.
Step 5, continuously conveying the secondary sedimentation tank sludge and the raw water after the aeration of the pre-aeration tank for 12 hours to the mixing reaction chamber 21, and starting an aeration pump P25; then the peristaltic pump P31 is turned on, the mud-water mixture in the mixing reaction chamber 21 is continuously conveyed to the measuring chamber 31, and the magnetic stirrer 36 is started; after the mixing reaction chamber 21 and the measuring chamber 31 are filled, the safety valves 25 and 33 are closed, the dissolved oxygen value of the mud-water mixture is continuously measured after 5min of stabilization, and the calculation method is the same as the step 3; wherein the flow rate of the peristaltic pump P31 is large or small
Figure GDA0002399508800000082
The flow of the peristaltic pumps P11, P21 and P22 passes through the MLSS measured in the second step1、MLSS2Calculating, correcting every 4h,
Figure GDA0002399508800000083
Q22＝Q31-Q21。
step 6, opening peristaltic pumps P23 and P24 to remove nitrification inhibitor NaClO3And ATU is transmitted to the mixing reaction chamber 21, and the dissolved oxygen value of the muddy water mixture is continuously measured; the measurement period of nitrification activity is 15min, and the actual respiratory rate OUR before adding medicine0And the stable respiration rate OUR after adding medicineSuppression ofThe difference value of (a) is the nitrification activity; controlling NaClO in the mixing reaction chamber 21 during measurement3The amount of (b) was 20. mu.M and the amount of ATU was 5 mg/L.
Step 7, exhausting and cleaning the mixing reaction chamber 21 and the measuring chamber 31, namely repeating the step 4; then, collecting the initial concentration C of nitrate and nitrogen in the supernatant of the secondary sedimentation tankN-0(ii) a Measurement CN-0Then, the sludge in the secondary sedimentation tank after the aeration of the pre-aeration tank for 12 hours is addedContinuously conveying the supernatant of the secondary sedimentation tank of the carbon source to the mixing reaction chamber 21, and starting the magnetic stirrer 22; then the peristaltic pump P31 is turned on, the mud-water mixture in the mixing reaction chamber 21 is continuously conveyed to the measuring chamber 31, and the magnetic stirrer 36 is started; after the overflow port is full of the nitrate nitrogen concentration C, the nitrate nitrogen concentration C of the overflow port is continuously collectedNT, the acquisition cycle is 20min, and the acquisition frequency is 5 s/time; after one acquisition period is finished, the acquired data is automatically subjected to linear regression by using data processing software in a control and data processing system through a least square method, and the absolute value of the obtained slope is calculated, namely the denitrification rate.
And 8, exhausting and cleaning the mixed reaction chamber and the measuring chamber after the collection is finished.
In this embodiment, the nitrification activity and the denitrification activity of the activated sludge may be automatically measured in sequence according to the steps 1 to 8, or one of the indexes may be detected on line. In order to realize automatic on-line measurement, the industrial control computer 41 is provided with a circulation control program, and after the measurement period is completed, the circulation control program returns to an initial state to prepare for the next measurement.
The invention can realize 24h unattended operation and automatically carry out data measurement on the sludge activity of the activated sludge treatment system all day. The respiration rate is measured on line, the nitrification activity and the denitrification activity of the activated sludge are represented, the activity change conditions of nitrifying bacteria and denitrifying bacteria in the biological sludge are known more intuitively, and a basis is provided for controlling the nitrification and denitrification processes in the activated sludge treatment system.
The present invention is not limited to the above-described examples, and various changes can be made without departing from the spirit and scope of the present invention within the knowledge of those skilled in the art.

Claims (6)

1. A device based on multi-parameter automatic monitoring biological sludge activity, characterized by comprising: the system comprises a pre-aeration system, a mixed reaction system, a measuring system and a control and data processing system, wherein the mixed reaction system is respectively connected with the pre-aeration system and the measuring system; the control and data processing system controls the work of the pre-aeration system, the mixed reaction system and the measurement system and collects data on line;
the mixing reaction system comprises a mixing reaction chamber, two three-way miniature electric valves, a flow valve, a safety valve, four peristaltic pumps, an aeration pump, a magnetic stirrer and two reagent boxes; one of the two three-way miniature electric valves of the mixed reaction system is respectively connected with raw water, a secondary sedimentation tank of a sewage plant and one of four peristaltic pumps of the mixed reaction system, the peristaltic pump of the mixed reaction system conveys the raw water or supernatant of the secondary sedimentation tank of the sewage plant to the mixed reactor, and the three-way miniature electric valve of the other mixed reaction system is respectively connected with a measuring chamber, a system sludge discharge port and a mixed reaction chamber sludge discharge port; the flow valve of the mixing reaction system conveys tap water to the mixing reaction chamber at a set flow rate; the safety valve of the mixing reaction system is arranged at the top of the mixing reaction chamber; the other peristaltic pump in the four peristaltic pumps of the mixed reaction system conveys sludge in the pre-aeration chamber to the mixed reaction chamber; an aeration pump of the mixing reaction system is arranged in the mixing reaction chamber; the magnetons of the magnetic stirrer of the mixed reaction system are arranged in the mixed reaction chamber; the other two peristaltic pumps in the four peristaltic pumps of the mixed reaction system respectively pump NaClO in the two medicament boxes3Continuously conveying the solution and the ATU solution into a mixing reaction chamber;
the measuring system comprises a measuring chamber, a three-way micro electric valve, a two-way micro electric valve, a peristaltic pump, a safety valve, an overflow port, a magnetic stirrer, an online dissolved oxygen meter, a sludge concentration measuring instrument and a nitrate nitrogen measuring instrument; the online dissolved oxygen instrument is arranged in the middle part in the measuring chamber; wherein, the respiration rate, the sludge concentration and the nitrate nitrogen concentration are all measured in the measuring system.
2. The apparatus for multi-parameter based automatic monitoring of biological sludge activity as claimed in claim 1, wherein the pre-aeration system comprises a pre-aeration chamber, two three-way micro electric valves, a peristaltic pump and an aeration pump; one of the two three-way micro electric valves of the pre-aeration system is respectively connected with a peristaltic pump of the pre-aeration system, tap water and a sample inlet of the pre-aeration chamber, and the other three-way micro electric valve of the pre-aeration system is respectively connected with a mixing reaction chamber, a system sludge outlet and a sludge outlet of the pre-aeration chamber; the peristaltic pump of the pre-aeration system conveys sludge or tap water in a secondary sedimentation tank of a sewage plant to the pre-aeration chamber; and an aeration pump of the pre-aeration system is arranged in the pre-aeration chamber.
3. The device for automatically monitoring the biological sludge activity based on multiple parameters as claimed in claim 2, wherein the three-way micro electric valve of the measuring system is respectively connected with the peristaltic pump, tap water and the sample inlet of the measuring chamber of the measuring system; the two-way miniature electric valve of the measuring system is respectively connected with a measuring chamber sludge discharge port and a system sludge discharge port; the peristaltic pump of the measuring system conveys the muddy water mixture or tap water in the mixing reaction chamber to the measuring chamber; the safety valve of the measuring system is arranged at the top of the measuring chamber; an overflow port of the measuring system is arranged on the side wall of the measuring chamber; the magnetons of the magnetic stirrer of the measuring system are arranged in the measuring chamber.
4. The apparatus for multi-parameter based automatic monitoring of biological sludge activity according to claim 3 wherein the control and data processing system comprises an industrial control computer and an I/O module; the industrial control computer is provided with four RS485 interfaces, the data output ends of the online dissolved oxygen instrument, the sludge concentration measuring instrument and the nitrate nitrogen measuring instrument are all connected with the four RS485 interfaces of the industrial control computer, and corresponding data are obtained by adopting a Modbus RTU protocol; a data processing program required by the measurement process is set in the industrial control computer, so that real-time display of data, historical data storage and reaction flow control are realized; and the I/O module outputs action signals sent by the industrial control computer to the peristaltic pump, the aeration pump, the magnetic stirrer, the micro electric valve and the safety valve to control the work of the peristaltic pump, the aeration pump, the magnetic stirrer, the micro electric valve and the safety valve.
5. The method for automatically monitoring the biological sludge activity based on multiple parameters is applied to the device for automatically monitoring the biological sludge activity based on multiple parameters, which comprises the following steps:
step 1, conveying sludge of a secondary sedimentation tank of a sewage plant to a pre-aeration chamber and aerating;
step 2, measuring the sludge concentration of a secondary sedimentation tank and an aeration tank of the sewage plant by using a sludge concentration measuring instrument;
step 3, continuously conveying the sludge subjected to aeration for 12 hours in the pre-aeration chamber to a mixing reaction chamber and aerating, continuously conveying the activated sludge in the mixing reaction chamber to a measuring chamber and stirring, continuously measuring the dissolved oxygen value of the mud-water mixture after the mixing reaction chamber and the measuring chamber are filled, calculating the endogenous respiration rate, and setting a calculation program in an industrial control computer;
step 4, exhausting and cleaning the mixed reaction chamber and the measuring chamber;
step 5, continuously conveying the pre-aerated sludge and the raw water to a mixing reaction chamber for aeration, continuously conveying the sludge-water mixture in the mixing reaction chamber to a measuring chamber for stirring, continuously measuring the dissolved oxygen value of the sludge-water mixture after the mixing reaction chamber and the measuring chamber are filled, calculating the actual respiratory rate, and setting the calculation program in an industrial control computer;
step 6, adding a nitrification inhibitor NaClO3And transmitting ATU to the mixing reaction chamber, continuously measuring dissolved oxygen value of the slurry mixture, calculating actual respiratory rate after adding medicine, and OUR before adding medicine0And the stable respiration rate OUR after adding medicineSuppression ofThe difference value of (a) is the nitrification activity;
step 7, draining and cleaning the mixed reaction chamber and the measuring chamber, and then measuring the initial concentration C of the nitrate and the nitrogen in the supernatant of the secondary sedimentation tank of the sewage plantN-0Then continuously conveying the sludge in the pre-aeration chamber and the supernatant of the secondary sedimentation tank added with the carbon source to the mixing reaction chamber and stirring, continuously conveying the mud-water mixture in the mixing reaction chamber to the measuring chamber and stirring, and continuously collecting the nitrate nitrogen concentration C at the overflow portN-tCalculating the absolute value of the slope, namely the denitrification rate, in the control and data processing system by utilizing a calculation program;
8, draining and cleaning the mixed reaction chamber and the measuring chamber after the collection is finished;
repeating the steps 2-8 to measure various respiration rates of the activated sludge treatment system on line, and calculating the nitrification activity and the denitrification activity according to the measured data.
6. The method for automatically monitoring the activity of biological sludge based on multiple parameters as claimed in claim 5, wherein the nitrification activity and the denitrification activity of the activated sludge are automatically measured in sequence or one of the indexes is detected on line according to the steps 1 to 8.
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