CN115321760A - Village and town sewage treatment system with effluent reaching surface IV-class water and control method thereof - Google Patents
Village and town sewage treatment system with effluent reaching surface IV-class water and control method thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000010865 sewage Substances 0.000 title claims abstract description 44
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- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 13
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- 229910002651 NO3 Inorganic materials 0.000 claims description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 8
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- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
- C02F1/325—Irradiation devices or lamp constructions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
- C02F2209/008—Processes using a programmable logic controller [PLC] comprising telecommunication features, e.g. modems or antennas
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a system and a method for treating sewage in villages and towns, wherein the effluent of the system reaches surface IV water, and the system comprises the following steps: the control subsystem of the off-plant lifting pump station is provided with a water inlet and a water outlet, the water inlet is connected with an upstream pipe network, and the water outlet is sequentially connected with the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem through a lifting pump; the rear end of the advanced treatment subsystem is provided with a standard water outlet; the automatic control subsystem is in communication connection with the off-plant pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem, and controls the electrical equipment of the off-plant pump station control subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem to perform village and town sewage treatment according to collected instrument signals and equipment operation data in a preset mode. The system and the method can realize standard treatment of the sewage in the villages and the towns under the condition of lowest energy consumption.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a village and town sewage treatment system and a control method thereof.
Background
The ecological environment of the water in the society deteriorates day by day, the eutrophication problem of black and odorous water bodies and water bodies is very prominent, the requirements on sewage discharge limit are improved by some local standards, and the effluent of a sewage treatment plant with the sewage treatment facility accepting process wastewater proportion less than or equal to 30% and the treatment scale more than or equal to 1000 cubic meters per day is required to reach the surface standard IV-class standard according to some local regulations.
At present, stricter discharge standards put higher requirements on the on-site treatment operation control of the dispersive village and small town sewage in the middle and small towns. The water quality and the water quantity of the sewage in the villages and the towns are greatly fluctuated and extremely unevenly distributed, and the problems of excessive medicament addition, high energy consumption and the like can be faced if no reasonable and effective operation control strategy exists. Aiming at the fact that the UCT process based on the improvement of denitrifying phosphorus removal can effectively deal with sewage with low carbon-nitrogen ratio, the effluent quality can reach the standard of surface standard IV class, a reasonable and effective operation control method is provided for the process, and the operation cost of the process can be effectively reduced under the condition that the effluent of the process is stable and meets the standard.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a village and town sewage treatment system with effluent reaching surface IV water and a control method thereof, which can effectively reduce the problem of high power consumption and drug consumption caused by large fluctuation and uneven distribution of village and town sewage water volume, and further solve the technical problems in the prior art.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a village and town sewage treatment system with effluent reaching surface IV class water, which comprises:
the system comprises an off-plant lifting pump station subsystem, a pretreatment subsystem, an enhanced biological treatment subsystem, an advanced treatment subsystem and an automatic control subsystem; wherein the content of the first and second substances,
the control subsystem of the off-plant lifting pump station is provided with a water inlet and a water outlet, the water inlet is connected with an upstream pipe network, and the water outlet is sequentially connected with the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem through a lifting pump;
the rear end of the advanced treatment subsystem is provided with a standard water outlet;
the automatic control subsystem is respectively in communication connection with the off-plant pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the deep treatment subsystem, and controls the electrical equipment of the off-plant pump station control subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the deep treatment subsystem to perform village and town sewage treatment according to collected instrument signals and equipment operation data in a preset mode.
The embodiment of the invention also provides a method for controlling the village and town sewage treatment system with the effluent reaching the surface IV water, which comprises the following steps:
the automatic control subsystem of the system is in communication connection with the off-plant pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem;
and the automatic control subsystem controls the electrical equipment of the off-plant pump station control subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem to perform village and town sewage treatment according to the collected instrument signals and equipment operation data in a preset mode.
Compared with the prior art, the village and town sewage treatment system with the effluent reaching the surface IV water and the control method thereof have the beneficial effects that:
the automatic control subsystem is used for acquiring instrument signals and equipment operation data of the off-plant lifting pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem, and can optimally control power consumption equipment and dosing equipment of the off-plant lifting pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem according to the instrument signals and the equipment operation data.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic configuration diagram of a town sewage treatment system in which effluent reaches surface class IV water according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating an apparatus efficiency management and control sub-module of the village and town sewage treatment system according to the embodiment of the present invention.
Fig. 3 is a schematic view of the configuration of the drug consumption control submodule of the village and town sewage treatment system provided by the embodiment of the present invention.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below by combining the specific content of the invention; it is to be understood that the described embodiments are merely exemplary of the invention, and are not intended to limit the invention to the particular forms disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The terms that may be used herein are first described as follows:
the term "and/or" means that either or both can be achieved, for example, X and/or Y means that both cases include "X" or "Y" as well as three cases including "X and Y".
The terms "comprising," "including," "containing," "having," or other similar terms of meaning should be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, process, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article of manufacture), is to be construed as including not only the particular feature explicitly listed but also other features not explicitly listed as such which are known in the art.
The term "consisting of 823070 \8230composition" means to exclude any technical characteristic elements not explicitly listed. If used in a claim, the term shall render the claim closed except for the inclusion of the technical features that are expressly listed except for the conventional impurities associated therewith. If the term occurs in only one clause of the claims, it is defined only to the elements explicitly recited in that clause, and elements recited in other clauses are not excluded from the overall claims.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured," etc., are to be construed broadly, as for example: can be fixedly connected, can also be detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms herein can be understood by those of ordinary skill in the art as appropriate.
When concentrations, temperatures, pressures, dimensions, or other parameters are expressed as ranges of values, the ranges are to be understood as specifically disclosing all ranges formed from any pair of upper, lower, and preferred values within the range, regardless of whether ranges are explicitly recited; for example, if a numerical range of "2 to 8" is recited, then that numerical range should be interpreted to include ranges such as "2 to 7," "2 to 6," "5 to 7," "3 to 4 and 6 to 7," "3 to 5 and 7," "2 and 5 to 7," and the like. Unless otherwise indicated, the numerical ranges recited herein include both the endpoints thereof and all integers and fractions within the numerical range.
The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship that is indicated based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description only, and are not meant to imply or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and therefore are not to be construed as limiting herein.
The town sewage treatment system and the control method thereof, which can reach IV-class water on the ground surface, provided by the invention are described in detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art. Those not specifically mentioned in the examples of the present invention were carried out according to the conventional conditions in the art or conditions suggested by the manufacturer. The reagents and instruments used in the examples of the present invention are not specified by manufacturers, and are conventional products commercially available.
As shown in fig. 1, an embodiment of the present invention provides a system for treating sewage in villages and towns, wherein the effluent reaches surface IV water, comprising:
the system comprises an off-plant lifting pump station subsystem, a pretreatment subsystem, an enhanced biological treatment subsystem, an advanced treatment subsystem and an automatic control subsystem; wherein, the first and the second end of the pipe are connected with each other,
the control subsystem of the off-plant lifting pump station is provided with a water inlet and a water outlet, the water inlet is connected with an upstream pipe network, and the water outlet is sequentially connected with the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem through a lifting pump;
the rear end of the advanced treatment subsystem is provided with a standard water outlet;
the automatic control subsystem is respectively in communication connection with the external pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem, and controls the electrical equipment of the external pump station control subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem to perform village and town sewage treatment according to collected instrument signals and equipment operation data in a preset mode.
Referring to fig. 1, in the above processing system, the automatic control subsystem includes: an equipment efficiency control submodule, an electricity consumption control submodule and a medicine consumption control submodule, wherein,
the equipment efficiency control submodule can control the energy efficiency of an off-plant lifting pump according to the water inlet flow meter, control the energy efficiency of a regulating reservoir lifting pump of the pretreatment subsystem according to the water outlet flow meter and control the frequency of a fan according to the dissolved oxygen control of an aerobic pool of the enhanced biological treatment subsystem;
the power consumption control submodule controls the starting and stopping quantity of power consumption equipment contained in the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem in groups according to the corresponding control mode according to the actual liquid level of the regulating reservoir of the pretreatment subsystem;
the drug consumption control submodule can control the adding amount of the carbon source of the enhanced biological treatment subsystem, the adding amount of PAC of the advanced treatment subsystem and the adding amount of sodium hypochlorite.
The functions of the sub-modules are independent, but the sub-modules can be cooperatively optimized within the cross available range of the instrument and equipment operation parameters shared by the sub-systems.
Specifically, the equipment efficiency control submodule is mainly used for performing energy efficiency control on equipment with large power consumption in a sewage treatment process, controlling the energy efficiency of an off-plant lift pump according to a water inlet flowmeter, controlling the energy efficiency of a lift pump of an adjusting tank according to a water outlet flowmeter, and controlling the frequency of a fan according to dissolved oxygen in an aerobic tank, so as to control the operation energy efficiency of the equipment with large power consumption, wherein the control means is PLC control, the maximum frequency and the minimum frequency corresponding to a control range are set, and the energy efficiency is adjusted, controlled and optimized within a range;
the power consumption control submodule is mainly used for controlling and optimizing the starting and stopping quantity of equipment in each working section of the sewage treatment process. The fluctuation of the sewage water amount of villages and towns is large, the equipment type selection is small, a large number of hot standby equipment is reserved, the adjustment is convenient, and the starting and stopping quantity of power consumption equipment contained in the pretreatment and enhanced biological treatment subsystem and the advanced treatment subsystem is controlled in groups according to the actual liquid level of the adjusting tank and the corresponding control mode;
the medicine consumption control submodule mainly controls the carbon source adding amount of the enhanced biological treatment subsystem, the PAC adding amount of the advanced treatment subsystem and the sodium hypochlorite adding amount.
Referring to fig. 2, in the above processing system, the power consumption control sub-module controls the starting number of the power consumption devices of the pretreatment sub-system, the enhanced biological treatment sub-system and the advanced treatment sub-system according to the actual liquid level of the conditioning tank in the pretreatment sub-system in the corresponding control mode according to the following modes:
if the actual measured value of the liquid level of the regulating tank is lower than the preset low liquid level set value in the power consumption control subsystem, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to stop running;
if the actual measured value of the liquid level of the regulating tank is higher than a preset medium liquid level set value and lower than a preset high liquid level set value in the power consumption control subsystem, controlling power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to operate according to a process list;
and if the actual measured value of the liquid level of the regulating tank is determined to exceed a preset high liquid level set value in the power consumption control subsystem, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to run according to the full load according to the process.
Referring to fig. 3, in the processing system, the power consumption equipment of the off-plant lift pump station subsystem is a water intake lift pump;
the power consumption equipment of the preprocessing subsystem is as follows: the device comprises an electric coarse grating, an electric fine grating, a flow impeller and a lift pump;
the power consumption equipment of the enhanced biological treatment subsystem is as follows: a reflux pump, a flow impeller, a fan and a residual sludge pump;
the power consumption equipment of the deep processing subsystem is as follows: a flocculation sedimentation tank stirrer, a sand filter tank water inlet pump, an ultraviolet lamp and a sludge tank stirring device.
The embodiment of the invention also provides a control method of the village and town sewage treatment system, the effluent of which reaches the surface IV water, comprising the following steps:
the system is in communication connection with an off-plant pump station subsystem, a pretreatment subsystem, an enhanced biological treatment subsystem and a deep treatment subsystem of the system through an automatic control subsystem of the system;
and the automatic control subsystem controls the electrical equipment of the off-plant pump station control subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem to perform village and town sewage treatment according to the collected instrument signals and equipment operation data in a preset mode.
In the above control method, the equipment efficiency control sub-module of the automatic control sub-system controls each power consumption equipment of the off-plant booster pump station sub-system, the pretreatment sub-system, the enhanced biological treatment sub-system and the advanced treatment sub-system in the following manner, including:
the operation frequency of the fan is controlled according to the dissolved oxygen of the aerobic tank of the enhanced biological treatment subsystem, specifically, the upper limit value and the lower limit value of the dissolved oxygen of the aerobic tank are set to be 4mg/L and 1.5mg/L in the energy efficiency control submodule, the operation frequency of the fan is adjusted through dissolved oxygen feedback, the operation frequency of the fan is changed between 25 Hz and 50Hz, the frequency of the fan is reduced when the dissolved oxygen is increased, and the frequency of the fan is increased when the dissolved oxygen is reduced, so that the operation power consumption can be reduced.
In the above control method, the electricity consumption control submodule of the automatic control subsystem controls all electricity consumption devices of the conditioning tank, the enhanced biological treatment subsystem and the advanced treatment subsystem according to the actual liquid level of the conditioning tank in the pretreatment subsystem in a corresponding control mode in the following manner:
if the actual measured value of the liquid level of the regulating tank is lower than the preset low liquid level set value, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to stop running;
if the actual measured value of the liquid level of the regulating tank is higher than the preset middle liquid level set value and lower than the preset high liquid level set value, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to operate in a single process;
and if the actual measured value of the liquid level of the regulating tank is determined to exceed the preset high liquid level set value, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to run at full load according to the process.
In the control method, the chemical consumption control submodule of the automatic control subsystem controls the adding of the carbon source to the enhanced biological treatment subsystem according to the detection value of the nitrate online instrument in the enhanced biological treatment subsystem in the following mode, controls the PAC adding amount of the advanced treatment subsystem according to the change of the total phosphorus concentration of the effluent, and controls the sodium hypochlorite adding amount of the advanced treatment subsystem according to the water inlet amount, and the control method comprises the following steps:
controlling the dosage of a carbon source in the anoxic tank according to the nitrate concentration value of the anoxic tank monitored by a nitrate online instrument arranged in the anoxic tank of the enhanced biological treatment subsystem;
controlling a PAC dosing pump of the pretreatment subsystem according to the monitored effluent total phosphorus concentration value;
and controlling a sodium hypochlorite dosing pump of the advanced treatment subsystem according to a preset proportion according to the water inflow rate, so that the dosage of the sodium hypochlorite is adjusted within the range of 2-7 mg/L, and can be adjusted according to the escherichia coli and the residual chlorine in the effluent, and the adjustment frequency can be controlled to be once per week.
In summary, the treatment system and the control method of the embodiment of the invention can perform optimized control on the power consumption equipment and the dosing equipment of the off-plant lifting pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem according to instrument signals and equipment operation data through the communication connection of the automatic control subsystem with the off-plant lifting pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem, and can meet high discharge standards with minimum power consumption and drug consumption on the premise of realizing less-human-guard automatic control, so that the effluent reaches the standard of surface IV water.
In order to more clearly show the technical scheme and the technical effects provided by the invention, a system and a method for treating sewage in villages and towns with effluent reaching surface IV class water provided by the embodiment of the invention are described in detail by specific embodiments.
Examples
As shown in fig. 1, an embodiment of the present invention provides a system for treating sewage in villages and towns, wherein the effluent reaches surface IV water, comprising:
the system comprises an off-plant lifting pump station subsystem, a pretreatment subsystem, an enhanced biological treatment subsystem, a deep treatment subsystem and an automatic control subsystem; wherein the content of the first and second substances,
the control subsystem of the off-plant lifting pump station is provided with a water inlet and a water outlet, the water inlet is connected with an upstream pipe network and automatically flows into the pump station through sewage gravity, and the outlet water enters the pretreatment subsystem through a lifting pump;
the pretreatment subsystem is provided with a sewage inlet and a water outlet, and the water outlet is sequentially connected with the enhanced biological treatment subsystem and the advanced treatment subsystem;
the advanced treatment subsystem is provided with a standard water outlet;
the automatic control subsystem is respectively in communication connection with the off-plant pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem, and can cooperatively control the off-plant pump station control subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem to carry out village and town sewage treatment.
In the above system, the automatic control subsystem comprises: an equipment efficiency control submodule, an electricity consumption control submodule and a medicine consumption control submodule, wherein,
the equipment efficiency control submodule respectively controls the operation efficiency of equipment such as a pump and a fan, so that the operation power consumption can be further reduced under the condition that the effluent is stable and reaches the standard, wherein the fan is a variable frequency fan, and the system comprises liquid level detection and water flow monitoring equipment;
the power consumption control submodule collects power and running time of power consumption equipment respectively according to each process unit in sequence, and a power consumption distribution diagram of the process units of the single factory is made in a gathering mode, and specific power consumption equipment is as follows:
the off-plant lifting pump station control subsystem comprises a floating ball and a lifting pump, wherein the main power consumption equipment is the lifting pump;
the pretreatment subsystem comprises: the device comprises a grating and an adjusting tank, wherein main power consumption equipment comprises a coarse grating, a fine grating, a flow impeller and a lifting pump;
the enhanced biological treatment subsystem: the main power consumption equipment comprises a reflux pump, a flow impeller, a fan, an excess sludge pump and the like;
the deep processing subsystem: the advanced treatment subsystem mainly comprises a flocculation sedimentation tank, a sand filter tank, an ultraviolet and pasteurization metering tank, and the main power consumption equipment comprises a flocculation sedimentation tank stirrer, a sand filter tank water inlet pump, an ultraviolet lamp, a sludge tank stirring device and the like;
the electricity consumption control submodule controls the adjusting tank and the subsequent intensified biological treatment subsystem as a biochemical section according to the liquid level of the adjusting tank of the pretreatment subsystem, and the quantity of electricity consumption equipment of the advanced treatment subsystem, and the specific measures are as follows:
dividing the liquid level of the regulating tank into a high level, a medium level and a low level according to different set values (if the regulating tank is 6m deep, the set value of the high liquid level is 5m, the set value of the medium liquid level is 4m, and the set value of the low liquid level is 3 m), and controlling the running number of power consumption equipment of the regulating tank, the enhanced biological treatment subsystem and the advanced treatment subsystem according to the liquid level of the regulating tank;
when the actual measured value of the liquid level of the regulating tank is 3m lower than the set value of the low liquid level, the controlled power consumption equipment stops running;
when the actual measured value of the liquid level of the regulating tank is 3m greater than the set value of the low liquid level, the biochemical section and the subsequent advanced treatment process are operated in a single row;
when the actual measured value of the liquid level of the regulating tank is reduced to be less than the set value of the low liquid level by 3m, the power consumption equipment of the biochemical section and the subsequent advanced treatment process is closed;
when the actual measured value of the liquid level of the regulating tank rises to exceed the set value of the high liquid level by 5m, two columns of the biochemical section and the subsequent advanced treatment section are all started to operate according to full load;
when the actual measured value of the liquid level of the regulating tank is reduced to be less than 5m of the high liquid level set value, continuously keeping the biochemical section and the subsequent advanced treatment section equipment to operate according to full load, and after the liquid level of the regulating tank is lower than the low liquid level set value, stopping the operation of the controlled equipment;
the set value of the low liquid level is set to be more than half of the depth of the regulating pool (for example, more than 2.5 m) according to the actual situation, so that the actual lift of the lift pump is reduced, the energy efficiency of the pump is improved, and the power consumption is reduced;
judging whether the lift pump is blocked according to the change of the water inflow numerical value, and sending out an early warning prompt to clean the lift pump outside the plant when the flow loss reaches 20% under the condition that the actual head of the lift pump is unchanged so as to avoid the reduction of the flow due to the increase of the power consumption caused by the blockage of the pump.
Further, as shown in fig. 2, the energy efficiency of the lift pump of the regulating reservoir is judged according to the effluent flow, and if the flow attenuation of the lift pump exceeds 20% under the condition that the liquid level of the regulating reservoir is unchanged, the lift pump of the regulating reservoir needs to be cleaned, so that the phenomenon that the power consumption is increased and the flow is reduced due to the blockage of the pump is avoided;
further, as shown in fig. 2, the operation frequency of the fan is controlled according to the dissolved oxygen in the aerobic tank, the upper limit setting value and the lower limit setting value of the dissolved oxygen in the aerobic tank are modified to adjust the operation frequency of the fan, and the operation power consumption is reduced;
further, as shown in fig. 3, the drug consumption control submodule mainly controls the dosage of the carbon source, the PAC and the sodium hypochlorite;
further, a nitrate online instrument is installed in the anoxic tank, the adding amount of the carbon source is controlled according to the concentration of nitrate in the anoxic tank, the adding positions of the carbon source are respectively arranged in the anoxic tank and the anaerobic tank, the adding positions are adjusted according to the quality of inlet water, and the adding of the chemical is carried out in the anoxic tank when the quality of the inlet water is low;
further, as shown in fig. 3, the PAC dosing pump is controlled according to the change of the total phosphorus concentration of the effluent, and the PAC dosing amount controls the dosing amount of the phosphorus removal agent according to the total phosphorus concentration of the effluent;
furthermore, the dosage of sodium hypochlorite is controlled by a dosing pump according to the inflow rate, so that the dosage of sodium hypochlorite is adjusted within the range of 2-7 mg/L, the sodium hypochlorite dosing pump is delayed to be started according to the process duration, and the concentration of residual chlorine in effluent is ensured.
In summary, according to the village and town sewage treatment system with high discharge standard and the control method thereof provided by the embodiment of the invention, the equipment efficiency control submodule, the power consumption control submodule and the medicine consumption control submodule of the automatic control subsystem can be used for carrying out optimized control on the power consumption equipment and the medicine adding equipment of the off-site lifting pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem, and on the premise of realizing less-manual on-duty automatic control, the high discharge standard can be met with the minimum power consumption and medicine consumption, so that the effluent reaches the standard of surface IV water.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
Claims (8)
1. A village and town sewage treatment system with effluent reaching surface IV class water is characterized by comprising:
the system comprises an off-plant lifting pump station subsystem, a pretreatment subsystem, an enhanced biological treatment subsystem, an advanced treatment subsystem and an automatic control subsystem; wherein the content of the first and second substances,
the control subsystem of the off-plant lifting pump station is provided with a water inlet and a water outlet, the water inlet is connected with an upstream pipe network, and the water outlet is sequentially connected with the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem through a lifting pump;
the rear end of the advanced treatment subsystem is provided with a standard water outlet;
the automatic control subsystem is respectively in communication connection with the off-plant pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the deep treatment subsystem, and controls the electrical equipment of the off-plant pump station control subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the deep treatment subsystem to perform village and town sewage treatment according to collected instrument signals and equipment operation data in a preset mode.
2. A village and town sewage treatment system with effluent reaching surface class IV water according to claim 1, wherein said automatic control subsystem comprises:
the device efficiency control sub-module, the power consumption control sub-module and the medicine consumption control sub-module; wherein, the first and the second end of the pipe are connected with each other,
the equipment efficiency control sub-module can control the energy efficiency of an external lifting pump according to the water inlet flow meter, control the energy efficiency of a regulating reservoir lifting pump of the pretreatment subsystem according to the water outlet flow meter and control the frequency of a fan according to the dissolved oxygen control of an aerobic pool of the enhanced biological treatment subsystem;
the power consumption control submodule controls the starting and stopping quantity of power consumption equipment contained in the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem in groups according to the corresponding control modes according to the actual liquid level of the regulating reservoir of the pretreatment subsystem;
the medicine consumption control submodule can control the adding amount of the carbon source of the enhanced biological treatment subsystem, the adding amount of PAC of the advanced treatment subsystem and the adding amount of sodium hypochlorite.
3. The village and town sewage treatment system with effluent reaching the surface IV class water according to claim 2, wherein the power consumption control subsystem module controls the starting number of power consumption equipment of the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem according to the actual liquid level of the regulating reservoir in the pretreatment subsystem in a corresponding control mode according to the following modes, and the system comprises:
if the actual measured value of the liquid level of the regulating tank is lower than the preset low liquid level set value in the power consumption control subsystem, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to stop running;
if the actual measured value of the liquid level of the regulating tank is higher than a preset medium liquid level set value and lower than a preset high liquid level set value in the power consumption control subsystem, controlling power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to operate according to a process list;
and if the actual measured value of the liquid level of the regulating tank exceeds a preset high liquid level set value in the power consumption control subsystem, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to run at full load according to the process.
4. The village and town sewage treatment system with effluent reaching the surface IV water according to claim 2 or 3, wherein the power consumption equipment of the off-plant lifting pump station subsystem is an influent water lifting pump;
the power consumption equipment of the preprocessing subsystem is as follows: the device comprises an electric coarse grating, an electric fine grating, a flow impeller and a lift pump;
the power consumption equipment of the enhanced biological treatment subsystem is as follows: a reflux pump, a flow impeller, a fan and a residual sludge pump;
the power consumption equipment of the deep processing subsystem is as follows: a flocculation sedimentation tank stirrer, a sand filter tank water inlet pump, an ultraviolet lamp and a sludge tank stirring device.
5. A method of controlling a village and town sewage treatment system from which effluent reaches surface class IV water according to any one of claims 1 to 4, comprising:
the system is in communication connection with an off-plant pump station subsystem, a pretreatment subsystem, an enhanced biological treatment subsystem and an advanced treatment subsystem of the system through an automatic control subsystem of the system;
and the automatic control subsystem controls the electrical equipment of the off-plant pump station control subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem to perform village and town sewage treatment according to the acquired instrument signals and equipment operation data in a preset mode.
6. The method as claimed in claim 5, wherein the step of controlling the power consumption devices of the off-site booster pump station subsystem, the pretreatment subsystem, the enhanced biological treatment subsystem and the advanced treatment subsystem by the device efficiency management and control subsystem of the automatic control subsystem comprises:
intermittent start-stop control is carried out on the flow impeller and the stirring equipment of the biochemical pool of the enhanced biological treatment subsystem, and the start-stop frequency and the start-stop duration of the equipment are adjusted according to a preset period on the premise that the sludge is not settled;
and controlling the running frequency of the fan according to the dissolved oxygen in the aerobic tank of the enhanced biological treatment subsystem, and adjusting the running frequency of the fan according to the preset upper limit set value and lower limit set value of the dissolved oxygen in the aerobic tank.
7. The method as claimed in claim 5, wherein the electricity consumption control sub-module of the automatic control sub-system controls all electricity consuming devices of the conditioning tank, the enhanced biological treatment sub-system and the advanced treatment sub-system of the pretreatment sub-system according to the actual liquid level of the conditioning tank of the pretreatment sub-system and the corresponding control mode, and comprises:
if the actual measured value of the liquid level of the regulating tank is lower than the preset low liquid level set value, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to stop running;
if the actual measured value of the liquid level of the regulating tank is higher than the preset middle liquid level set value and lower than the preset high liquid level set value, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to operate according to a single process;
and if the actual measured value of the liquid level of the regulating tank is determined to exceed the preset high liquid level set value, controlling the power consumption equipment of the enhanced biological treatment subsystem and the advanced treatment subsystem to run at full load according to the process.
8. The method as claimed in claim 5, wherein the step of controlling the dosage of the carbon source to the enhanced biological treatment subsystem by the chemical consumption control submodule of the automatic control subsystem according to the detection value of the nitrate online meter in the enhanced biological treatment subsystem, the PAC dosage of the advanced treatment subsystem according to the change of the total phosphorus concentration of the effluent, and the sodium hypochlorite dosage of the advanced treatment subsystem according to the water inflow comprises the steps of:
controlling the dosage of a carbon source in the anoxic tank according to the nitrate concentration value of the anoxic tank monitored by a nitrate online instrument arranged in the anoxic tank of the enhanced biological treatment subsystem;
controlling a PAC dosing pump of the pretreatment subsystem according to the monitored effluent total phosphorus concentration value;
and controlling a sodium hypochlorite dosing pump of the advanced treatment subsystem according to the water inflow rate, so that the dosage of the sodium hypochlorite is adjusted within the range of 2-7 mg/L.
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