CN117819702B - Module combined type nutrient supply control method in sewage treatment process - Google Patents
Module combined type nutrient supply control method in sewage treatment process Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims abstract description 26
- 238000005516 engineering process Methods 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000010802 sludge Substances 0.000 claims description 15
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- 238000007254 oxidation reaction Methods 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
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- 206010063385 Intellectualisation Diseases 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 22
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 5
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- WZRJTRPJURQBRM-UHFFFAOYSA-N 4-amino-n-(5-methyl-1,2-oxazol-3-yl)benzenesulfonamide;5-[(3,4,5-trimethoxyphenyl)methyl]pyrimidine-2,4-diamine Chemical compound O1C(C)=CC(NS(=O)(=O)C=2C=CC(N)=CC=2)=N1.COC1=C(OC)C(OC)=CC(CC=2C(=NC(N)=NC=2)N)=C1 WZRJTRPJURQBRM-UHFFFAOYSA-N 0.000 description 1
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- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a sewage treatment module combined nutrient supply control method and a system, wherein the method comprises the following steps: obtaining technological processes of different sewage treatment technologies; determining a nutrient supply control mode according to the process flow; and determining the number and the dosing positions of dosing pumps, the type of monitoring instruments and the installation positions of the dosing pumps in the nutrient supply intelligent control system according to the nutrient supply control mode. The scheme can adopt different nutrient supply modes for different sewage treatment processes, and meets the control requirements of refinement and intellectualization.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a module combined type nutrient supply control method and an intelligent nutrient supply control system in the sewage treatment process.
Background
Biological method-based sewage treatment processes are technologies that utilize microorganisms to degrade pollutants in wastewater. Nutrient supplementation is often required during biological treatment to ensure microbial metabolism and growth. The nutrient supply modes required by different sewage treatment processes are different. The existing nutrient supply method or system cannot accurately control the nutrient supply amount, and cannot be completely suitable for various sewage treatment processes.
Disclosure of Invention
In order to improve the applicability of nutrient supply control in multiple application scenes, the scheme builds a multi-module combined nutrient supply control method and a nutrient supply intelligent control system based on an artificial intelligent algorithm aiming at multiple types of biological denitrification process flows of sewage treatment.
According to a first aspect of the present invention, there is provided a module-combined nutrient supply control method in a sewage treatment process, comprising: obtaining technological processes of different sewage treatment technologies; determining a nutrient supply control mode according to the process flow; and determining the number and the dosing positions of dosing pumps, the type of monitoring instruments and the installation positions of the dosing pumps in the nutrient supply intelligent control system according to the nutrient supply control mode.
Optionally, in the module combined type nutrient supply control method in the sewage treatment process provided by the invention, the nutrient supply control mode comprises that the front control module independently controls the nutrient supply amount, the rear control module unit controls the nutrient supply amount, and the front control module and the rear control module jointly control the nutrient supply amount.
Optionally, in the method for controlling module combined nutrient supply in sewage treatment provided by the invention, if the process flow of the sewage treatment process only comprises a primary denitrification system, the control module controls nutrient supply in the sewage treatment process before use; if the process flow of the sewage treatment process comprises a primary denitrification system and a secondary or multiple denitrification system, respectively using a front control module and a rear control module to control nutrient supply of the primary denitrification system and the secondary or multiple denitrification system; if the process flow of the sewage treatment process only comprises a single anoxic tank, the post-use control module controls the nutrient supply of the single anoxic tank.
Optionally, in the method for controlling module combined nutrient replenishment in the sewage treatment process provided by the invention, the sewage treatment process is any one of an AAO process, an oxidation ditch process, a Barton process, a multistage AO process, a denitrification filter tank, an SBR and a derivative process thereof.
Optionally, in the module combined nutrient supply control method in the sewage treatment process provided by the invention, when the nutrient supply process of the oxidation ditch process or the AAO process is controlled by adopting the front control module, a dosing pipeline of the dosing pump is connected to the anoxic tank;
when the front control module and the rear control module are adopted to control the nutrient supply process of the Bayton cycle process or the multistage AO process, the dosing pipelines of the two dosing pumps are respectively connected to the anoxic tank of the primary denitrification system and the anoxic tank of the secondary or multistage denitrification system;
when the rear control module is adopted to control the nutrient replenishing process of the denitrification filter, a dosing pipeline of a dosing pump is connected to the denitrification filter;
When the front control module is adopted to control the nutrient replenishing process of the SBR and the derivative process thereof, a dosing pipeline of the dosing pump is connected to a water inlet pipeline of the SBR pool.
Optionally, in the module combined type nutrient supply control method in the sewage treatment process provided by the invention, when the front control module and the rear control module are adopted to control the nutrient supply process of the Bayton cycle process or the multi-stage AO process, the two dosing pumps respectively receive the dosing amounts output by the front control module and the rear control module.
Optionally, in the module combined type nutrient supply control method in the sewage treatment process provided by the invention, when a front control module is adopted to control the nutrient supply process of an oxidation ditch process or an AAO process, a sludge concentration meter, a dissolved oxygen meter, an NH 3 meter, an NO 3 meter and a thermometer are arranged in an aerobic tank, and an oxidation-reduction potential meter is arranged in an anoxic tank;
When a front control module and a rear control module are adopted to control the nutrient replenishing process of the Bayton cycle process or the multistage AO process, a TN instrument is arranged in an anoxic tank of a primary denitrification system, a monitoring instrument and an NH 3 instrument are arranged in an aerobic tank of the primary denitrification system, and an NO 3 instrument is respectively arranged at an anoxic tank inlet and an aerobic tank outlet of a secondary or multistage denitrification system;
When the rear control module is adopted to control the nutrient replenishing process of the denitrification filter, the NO 3 instrument is respectively arranged at the inlet and the outlet of the denitrification filter;
When the front control module is adopted to control the nutrient replenishing process of the SBR and the derivative process thereof, an NH 3 instrument or an NO 3 instrument or a TN instrument is arranged in the SBR pool.
According to a second aspect of the present invention, there is provided an intelligent control system for nutrient replenishment, comprising: the system comprises an upper computer, a server, a PLC control cabinet, a dosing pump and a monitoring instrument, wherein the upper computer is connected with the server, the PLC control cabinet is respectively connected with the server, the dosing pump and the monitoring instrument, an algorithm engine is arranged in the server, the system comprises a front control module and/or a rear control module and a database, and a nutrient supply control mode of the algorithm engine is determined according to a process flow of a sewage treatment process; the number and the dosing positions of the dosing pumps, the type of the monitoring instrument and the installation position are determined according to the nutrient supply control mode.
Optionally, in the intelligent control system for nutrient supply provided by the invention, the PLC control cabinet is configured to upload monitoring data of the monitoring instrument to the algorithm engine, and issue nutrient supply output by the algorithm engine to the dosing pump, so that the dosing pump doses nutrients in a sewage treatment process; the front control module and/or the rear control module are/is used for predicting the nutrient supply according to the water inflow data, iteratively correcting the predicted nutrient supply according to the water outflow index and the process parameter, and outputting the corrected nutrient supply.
Optionally, in the intelligent control system for nutrient replenishment provided by the invention, an artificial input port is reserved on an upper computer interface and is used for receiving the manually input internal reflux ratio, the five-day biochemical oxygen demand, the nutrient COD equivalent and the organic fraction ratio of the sludge and transmitting the internal reflux ratio, the five-day biochemical oxygen demand, the nutrient COD equivalent and the organic fraction ratio of the sludge to the algorithm engine.
According to the module combined type nutrient supply control method and the nutrient supply intelligent control system in the sewage treatment process, different nutrient supply control modes are set for different sewage treatment processes, and the algorithm engine adopts the design that the front control module and the rear control module independently operate and can operate in a combined mode, so that the applicability of nutrient supply control in multiple application scenes can be improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 illustrates a schematic flow diagram of a modular combined nutrient supply control method 100 in a wastewater treatment process according to one embodiment of the invention;
FIG. 2 shows a schematic diagram of a nutrient supply intelligent control system according to one embodiment of the invention;
FIG. 3 illustrates a schematic diagram of nutrient supply control of an oxidation ditch or AAO process, according to one embodiment of the invention;
FIG. 4 shows a schematic diagram of nutrient supply control of the Bayton process in accordance with one embodiment of the invention;
FIG. 5 illustrates a nutrient replenishment control schematic diagram for a multi-stage AO process in accordance with one embodiment of the present invention;
FIG. 6 shows a schematic diagram of nutrient supply control for a denitrification filter in accordance with one embodiment of the invention;
FIG. 7 shows a schematic diagram of nutrient supply control for an SBR process according to one embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Common sewage treatment processes include an AO process, an oxidation ditch process, a Barton process, a multistage AO process, an SBR (styrene butadiene rubber) and derivative processes thereof, a denitrification filter and the like. The above-mentioned sewage treatment process requires a nutrient supply control system to control the nutrient supply amount in the sewage treatment process.
In one embodiment of the invention, the nutrient supply intelligent control system is designed according to a mode that the front control module and the rear control module independently operate, and the front denitrification system and the rear denitrification system are correspondingly controlled by the front control module and the rear control module respectively.
The reaction tanks for supplying needed nutrients are different due to different technological processes of different sewage treatment technologies. Therefore, the scheme provides a module combined nutrient supply control method in the sewage treatment process, and nutrient supply can be set in different nutrient supply control modes according to different processes.
Fig. 1 shows a schematic flow diagram of a modular combined nutrient supply control method 100 in a wastewater treatment process according to one embodiment of the invention. As shown in fig. 1, step S110 is first performed to obtain the process flows of different sewage treatment processes.
For example, the AAO process comprises an anaerobic section, an anoxic section and an aerobic tank section, sewage and return sludge firstly enter the anaerobic tank to be completely mixed, part of BOD is removed, phosphorus is released by phosphorus-accumulating microorganisms in the return sludge, then the sewage flows into the anoxic tank, denitrifying bacteria take non-decomposed carbon-containing organic matters in the sewage as nutrients, and nitrate radical which flows in the aerobic tank through internal return is reduced into nitrogen to be released. Finally, sewage enters an aerobic tank, ammonia nitrogen (NH 3 -N) is subjected to nitration reaction to generate nitrate, meanwhile, organic matters are subjected to oxidative decomposition to supply energy for phosphorus-absorbing microorganisms, phosphorus is enriched in the microorganisms, and the phosphorus-enriched microorganisms are discharged in the form of phosphorus-enriched sludge after precipitation and separation.
The oxidation ditch technology is a circulation flow aeration ditch connected end to end, a continuous ring type reaction tank is used as a biological reaction tank, and the concentration of dissolved oxygen is formed into a concentration gradient along the length direction of the tank by utilizing the plug flow characteristic, so that aerobic, anoxic and anaerobic conditions are formed.
The Bayton cycle (Bacton) process and the multistage AO process are characterized in that one or more denitrification systems are additionally arranged at the rear end of the traditional AAO process to realize multiple denitrification, so that the total nitrogen index of the effluent quality is reduced to a lower level. In the Barton process and the multistage AO process, a denitrification system additionally arranged at the rear section of the biological pond and a denitrification system arranged at the front section of the biological pond run relatively independently.
The core of the SBR sequence intermittent activated sludge process and the derivative processes CASS and CAST is an SBR reaction tank, a sludge reflux system is not arranged, DO and BOD5 concentration gradients exist in the reaction tank, the anaerobic anoxic and aerobic sections are simultaneously arranged in a tank body, and the activated sludge expansion is effectively controlled through intermittent aeration, so that the method is particularly suitable for occasions with large intermittent discharge and flow change.
The denitrification filter is a biological filter with denitrification and denitrification functions, and only comprises an anoxic tank, so that three pollutants including suspended matters, total phosphorus and total nitrogen can be removed at the same time.
Step S120 is then performed to determine a nutrient supply control mode according to the process flow.
The nutrient supply control mode comprises that the front control module independently controls the nutrient supply quantity, the rear control module unit controls the nutrient supply quantity, and the front control module and the rear control module jointly control the nutrient supply quantity. Different control modes need to be selected according to different process flows.
Specifically, if the process flow of the sewage treatment process only comprises a primary denitrification system, the pre-use control module controls nutrient replenishment in the sewage treatment process.
If the process flow of the sewage treatment process comprises a primary denitrification system and a secondary or multiple denitrification system, the front control module and the rear control module are respectively used for controlling nutrient supply of the primary denitrification system and the secondary or multiple denitrification system.
If the process flow of the sewage treatment process only comprises a single anoxic tank, the post-use control module controls the nutrient supply of the single anoxic tank.
For example, a pre-control module is used to control nutrient make-up for an oxidation ditch or AAO process that contains only one denitrification system. For the Bayton process comprising a primary denitrification system, a secondary denitrification system and a multi-stage AO process comprising a primary denitrification system and a multi-time denitrification system, a front control module and a rear control module are adopted to respectively control nutrient supply of the primary denitrification system and the secondary/multi-time denitrification system. The denitrification filter is controlled by a rear control module only, and the SBR and the derivative process thereof are controlled by a front control module only.
And finally, executing step S130, and determining the number and the dosing positions of the dosing pumps and the type and the installation position of the monitoring instruments in the intelligent nutrient supply control system according to the nutrient supply control mode.
For example, when a pre-control module is used to control the nutrient replenishment process of the oxidation ditch process or the AAO process, the dosing line of the dosing pump is connected to the anoxic tank.
When the front control module and the rear control module are adopted to control the nutrient supply process of the Bayton cycle process or the multistage AO process, the dosing pipelines of the two dosing pumps are respectively connected to the anoxic tank of the primary denitrification system and the anoxic tank of the secondary or multistage denitrification system.
When the front control module and the rear control module are adopted to control the nutrient replenishing process of the Bayton process or the multistage AO process, the two dosing pumps respectively receive the dosing amounts output by the front control module and the rear control module.
When the rear control module is adopted to control the nutrient replenishing process of the denitrification filter, a dosing pipeline of a dosing pump is connected to the denitrification filter. When the front control module is adopted to control the nutrient replenishing process of the SBR and the derivative process thereof, a dosing pipeline of the dosing pump is connected to a water inlet pipeline of the SBR pool.
The meters and the mounting locations of the meters required for different process flows are also different. For example, when the nutrient replenishing process of the oxidation ditch process or the AAO process is controlled by adopting the front control module, a sludge concentration meter, a dissolved oxygen meter, an ammonia nitrogen meter (NH 3 meter), a nitrate nitrogen meter (NO 3 meter) and a thermometer are arranged in the aerobic tank, and an oxidation-reduction potential meter is arranged in the anoxic tank.
When the front control module and the rear control module are adopted to control the nutrient replenishing process of the Bayton process or the multistage AO process, a TN instrument is arranged in an anoxic tank of a primary denitrification system, a monitoring instrument and an NH 3 instrument are arranged in an aerobic tank of the primary denitrification system, and an NO 3 instrument is respectively arranged at an anoxic tank inlet and an aerobic tank outlet of a secondary or multistage denitrification system.
When the rear control module is adopted to control the nutrient replenishing process of the denitrification filter, the NO 3 instrument is respectively arranged at the inlet and the outlet of the denitrification filter.
When the front control module is adopted to control the nutrient replenishing process of the SBR and the derivative process thereof, an NH 3 instrument or an NO 3 instrument or a TN instrument is arranged in the SBR pool.
The NH 3 instrument is an instrument for detecting the concentration of ammonia nitrogen in water, the NO 3 instrument is an instrument for detecting the concentration of nitrate nitrogen in water, and the TN instrument is an instrument for measuring the total nitrogen concentration in water.
FIG. 2 shows a schematic diagram of a nutrient supply intelligent control system according to one embodiment of the invention. As shown in fig. 2, the nutrient supply intelligent control system includes: the device comprises an upper computer, a server, a PLC control cabinet, a dosing pump and a monitoring instrument, wherein the upper computer is connected with the server, and the PLC control cabinet is respectively connected with the server, the dosing pump and the monitoring instrument. The server is internally provided with an algorithm engine, and comprises a front control module and/or a rear control module and a database, wherein the nutrient supply control mode of the algorithm engine is determined according to the process flow of the sewage treatment process; the number and the dosing positions of the dosing pumps, the type of the monitoring instrument and the mounting position are determined according to the nutrient supply control mode.
For example, when the sewage treatment process is SBR and derived process or AAO process/oxidation ditch process, the algorithm engine only comprises a front control module, and at this time, the front control module is configured to predict the nutrient supply according to the water intake data of the anoxic tank or SBR tank, and correct the predicted nutrient supply according to the total nitrogen index of the effluent of the anoxic tank and the monitoring instrument data.
When the sewage treatment process is a denitrification filter, the algorithm engine only comprises a rear control module, and at the moment, the rear control module is used for predicting the nutrient supply according to the difference value between the water inlet nitrate nitrogen data and the water outlet nitrate nitrogen data of the denitrification filter and correcting the predicted nutrient supply according to the water outlet nitrate nitrogen index;
When the sewage treatment process is a Bayton cycle process or a multi-stage AO process, the algorithm engine comprises a front control module and a rear control module, and at the moment, the front control module is used for predicting the nutrient supply quantity of the primary denitrification system according to the water inflow, the internal reflux ratio and the external reflux ratio, calculating the nutrient supply time, and correcting the nutrient supply quantity of the primary denitrification system according to the total nitrogen index of the effluent of the front anoxic tank and the data of the monitoring instrument; the rear control module is used for predicting the nutrient supply quantity of the secondary or multiple denitrification system according to the difference value between the water and nitrogen output data of the front aerobic tank and the water and nitrogen output indexes of the front aerobic tank, and correcting the nutrient supply quantity of the secondary or multiple denitrification system according to the difference value between the water and nitrogen output data of the rear aerobic tank and the water and nitrogen output indexes of the rear aerobic tank and the process parameters.
Wherein, the upper computer interface is reserved with a manual input port for receiving the manual input internal reflux ratio, five-day biochemical oxygen demand (BOD 5), nutrient COD equivalent and sludge organic fraction ratio (MLVSS/MLSS). The front control module and/or the rear control module are/is used for predicting the nutrient supply according to the water inflow data, iteratively correcting the predicted nutrient supply according to the water outflow index and the process parameter, and outputting the corrected nutrient supply.
The PLC control cabinet can upload monitoring data of various instruments (such as a water inlet COD instrument, an NH 3 -N nitronitrogen instrument, a flowmeter, an anoxic tank TN total nitrogen instrument, an ORP oxidation-reduction potential instrument, an aerobic tank NH 3 -N nitronitrogen instrument, an MLSS sludge concentration instrument and a DO dissolved oxygen instrument) to the algorithm engine, and issue nutrient supply output by the algorithm engine to the dosing pump so that the dosing pump can dose nutrients in the sewage treatment process.
The system can carry out offline special training according to the characteristic parameters of different sewage treatment plants, so that the intelligent control model is more suitable for the actual running of the sewage treatment plants. After the off-line special training is finished, the second stage on-line training is carried out, and on-line running training is started by accessing on-site input/output signals and setting characteristic parameters. Along with the gradual maturity of second stage training, the system can smoothly take over the manual feeding nutrient work under the premise of not influencing the water outlet index, and the system enters the third stage to stabilize intelligent operation and regularly perform online data training according to background setting.
FIG. 3 illustrates a schematic diagram of nutrient supply control of an oxidation ditch or AAO process, according to one embodiment of the invention. As shown in fig. 3, a front control module of the algorithm engine is connected with a PLC control cabinet, and the PLC control cabinet is connected with a dosing pump and a plurality of meters. The dosing pipeline of the dosing pump is connected to the anoxic tank. The sludge concentration meter, the dissolved oxygen meter, the NH 3 meter, the NO 3 meter and the thermometer are arranged in the aerobic tank, and the oxidation-reduction potential meter (ORP meter) is arranged in the anoxic tank.
Fig. 4 shows a schematic diagram of nutrient supply control of the pavilion process according to one embodiment of the invention. As shown in fig. 4, the front control module and the rear control module of the algorithm engine are connected with the PLC control cabinet, and are connected with the PLC control cabinet through two dosing pumps, and the dosing pipelines of the two dosing pumps are respectively connected to the front anoxic tank and the rear anoxic tank. The TN instrument is arranged in the front anoxic tank, the monitoring instrument and the NH 3 instrument are arranged in the front aerobic tank, and the two NO 3 instruments are respectively arranged at the inlet of the rear anoxic tank and the outlet of the rear aerobic tank.
FIG. 5 illustrates a nutrient replenishment control schematic diagram for a multi-stage AO process in accordance with one embodiment of the present invention. As shown in fig. 5, the front control module and the rear control module of the algorithm engine are connected with the PLC control cabinet, and are connected with the PLC control cabinet through two dosing pumps, and the dosing pipelines of the two dosing pumps are respectively connected to the front anoxic tank of the primary denitrification system and the rear anoxic tank of the rear multistage denitrification system. The TN instrument is arranged in a front anoxic tank of the primary denitrification system, the monitoring instrument and the NH 3 instrument are arranged in a front aerobic tank of the primary denitrification system, and the plurality of NO 3 instruments are respectively arranged at a rear anoxic tank inlet and a rear aerobic tank outlet of the multi-stage denitrification system.
FIG. 6 shows a schematic diagram of nutrient supply control for a denitrification filter in accordance with one embodiment of the invention. As shown in fig. 6, a rear control module of the algorithm engine is connected with a PLC control cabinet, a dosing pump is connected with the PLC control cabinet, and a dosing pipeline of the dosing pump is connected to the denitrification filter tank. Two NO 3 instruments are respectively arranged at the inlet and the outlet of the denitrification filter.
FIG. 7 shows a schematic diagram of nutrient supply control for an SBR process according to one embodiment of the invention. As shown in fig. 7, the front control module of the algorithm engine is connected with the PLC control cabinet, the dosing pump is connected with the PLC control cabinet, and the dosing pipeline of the dosing pump is connected to the water inlet pipeline of the SBR pool. The NH 3 meter or the NO 3 meter or the TN meter is arranged in the SBR pool.
According to the module combined type nutrient supply control method and the nutrient supply intelligent control system in the sewage treatment process, different nutrient supply control modes are set for different sewage treatment processes, and the algorithm engine adopts the design that the front control module and the rear control module independently operate and can operate in a combined mode, so that the applicability of nutrient supply control in multiple application scenes can be improved.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.
As used herein, unless otherwise specified the use of the ordinal terms "first," "second," "third," etc., to describe a general object merely denote different instances of like objects, and are not intended to imply that the objects so described must have a given order, either temporally, spatially, in ranking, or in any other manner.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of the above description, will appreciate that other embodiments are contemplated within the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter.
Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative, but not limiting, of the scope of the invention, which is defined by the appended claims.
Claims (6)
1. A method for controlling the supply of nutrients by a modular combination in a wastewater treatment process, comprising the steps of:
Obtaining technological processes of different sewage treatment technologies, wherein the sewage treatment technologies are any one of an AAO technology, an oxidation ditch technology, a Barton technology, a multistage AO technology, a denitrification filter tank, an SBR and a derivative technology thereof;
Determining a nutrient supply control mode according to the process flow, wherein the nutrient supply control mode comprises that a front control module independently controls the nutrient supply amount, a rear control module unit controls the nutrient supply amount and the front control module and the rear control module jointly control the nutrient supply amount, and the nutrient supply control mode comprises the following steps: if the process flow of the sewage treatment process only comprises a primary denitrification system, controlling nutrient supply in the sewage treatment process by using a pre-use control module;
If the process flow of the sewage treatment process comprises a primary denitrification system and a secondary or multiple denitrification system, respectively using a front control module and a rear control module to control nutrient supply of the primary denitrification system and the secondary or multiple denitrification system;
if the process flow of the sewage treatment process only comprises a single anoxic tank, the post-use control module controls the nutrient supply of the single anoxic tank;
Determining the number and the dosing positions of dosing pumps and the type and the installation positions of monitoring instruments in an intelligent nutrient supply control system according to a nutrient supply control mode, wherein the intelligent nutrient supply control system comprises the following steps: when the front control module is adopted to control the nutrient supplying process of the oxidation ditch process or the AAO process, a dosing pipeline of a dosing pump is connected to the anoxic tank;
when the front control module and the rear control module are adopted to control the nutrient supply process of the Bayton cycle process or the multistage AO process, the dosing pipelines of the two dosing pumps are respectively connected to the anoxic tank of the primary denitrification system and the anoxic tank of the secondary or multistage denitrification system;
when the rear control module is adopted to control the nutrient replenishing process of the denitrification filter, a dosing pipeline of a dosing pump is connected to the denitrification filter;
When the front control module is adopted to control the nutrient replenishing process of the SBR and the derivative process thereof, a dosing pipeline of the dosing pump is connected to a water inlet pipeline of the SBR pool.
2. The method according to claim 1, wherein when the front control module and the rear control module are used to control the nutrient supply process of the botnet process or the multistage AO process, the two dosing pumps receive the dosing amounts output by the front control module and the rear control module, respectively.
3. The method for controlling the supply of nutrients in a modular manner in a sewage treatment process according to claim 1, wherein the step of determining the number and the positions of the dosing pumps, the types of the monitoring instruments and the installation positions of the dosing pumps in the intelligent control system according to the supply control mode of the nutrients comprises the steps of:
When a front control module is adopted to control the nutrient replenishing process of the oxidation ditch process or the AAO process, a sludge concentration meter, a dissolved oxygen meter, an NH 3 meter, an NO 3 meter and a thermometer are arranged in an aerobic tank, and an oxidation-reduction potential meter is arranged in an anoxic tank;
When a front control module and a rear control module are adopted to control the nutrient replenishing process of the Bayton cycle process or the multistage AO process, a TN instrument is arranged in an anoxic tank of a primary denitrification system, a monitoring instrument and an NH 3 instrument are arranged in an aerobic tank of the primary denitrification system, and an NO 3 instrument is respectively arranged at an anoxic tank inlet and an aerobic tank outlet of a secondary or multistage denitrification system;
When the rear control module is adopted to control the nutrient replenishing process of the denitrification filter, the NO 3 instrument is respectively arranged at the inlet and the outlet of the denitrification filter;
When the front control module is adopted to control the nutrient replenishing process of the SBR and the derivative process thereof, an NH 3 instrument or an NO 3 instrument or a TN instrument is arranged in the SBR pool.
4. A nutrient replenishment intelligent control system for performing the modular nutrient replenishment control method in a wastewater treatment process as claimed in any one of claims 1 to 3, comprising: the system comprises an upper computer, a server, a PLC control cabinet, a dosing pump and a monitoring instrument, wherein the upper computer is connected with the server, the PLC control cabinet is respectively connected with the server, the dosing pump and the monitoring instrument, and the system is characterized in that an algorithm engine is arranged in the server and comprises a front control module and/or a rear control module and a database, and the nutrient supply control mode of the algorithm engine is determined according to the process flow of a sewage treatment process; the number and the dosing positions of the dosing pumps, the type of the monitoring instrument and the installation position are determined according to the nutrient supply control mode.
5. The intelligent control system for nutrient supply according to claim 4, wherein the PLC control cabinet is configured to upload monitoring data of the monitoring instrument to the algorithm engine, and issue the nutrient supply output by the algorithm engine to the dosing pump, so that the dosing pump doses nutrients in a sewage treatment process; the front control module and/or the rear control module are/is used for predicting the nutrient supply according to the water inflow data, iteratively correcting the predicted nutrient supply according to the water outflow index and the process parameter, and outputting the corrected nutrient supply.
6. The intelligent control system for nutrient replenishment as recited in claim 4, wherein the upper computer interface is reserved with a manual input port for receiving a manually input internal reflux ratio, five-day biochemical oxygen demand, nutrient COD equivalent and sludge organic fraction ratio and transmitting to the algorithm engine.
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