Automated process control method and system in primary settling tanks, secondary settling tanks and/or sludge consolidation tanks at waste water treatment plants of housing and utilities infrastructure

FIELD: electricity.

SUBSTANCE: system comprises an assembly of capacitance-type primary converters to measure electric capacity (dielectric capacitivity) and electric resistance (electrical conductivity) and temperature, which is placed at mobile equipment inside a settling tank, an assembly of secondary converters coupled to the primary ones and supplying the primary converters with action signals of the preset frequency and amplitude and the instantaneous response values of voltage and current at the primary converters for further processing, a programmable device or an automated workspace for control coupled to the secondary converters through a wired or wireless communications line with functions of data collection, processing and storage, including control over changes in the measured values of dielectric capacitivity and electrical conductivity with time or in regard to a structure of the settling tank, as well as issuing of the final forecast for a level or properties of sediment or sludge.

EFFECT: improving efficiency of automated control for waste water settling tanks.

12 cl, 1 dwg

 

The present invention relates to the sector of housing and communal services and is aimed at further improvement of the technology of purification of sewage with the aim to guarantee and maintain the required quality of the discharged water and increase the efficiency of the treatment process.

A well-known technique for the measurement of qualitative and quantitative characteristics of different environments, based on the measurement of electrophysical parameters: permittivity and conductivity. In particular, in patent US 7624001, Canon KK, published 24.11.2009 described control technology wastewater, based on measuring the dielectric constant flow with further analysis of the processes in accordance with the mathematical model. Also, from patent application JP 2002035791, Mitsui Eng., published 05.02.2002 known control technology wastewater, providing simultaneous control of multiple parameters of the flow, including the dielectric constant and conductivity with further use of the results of measurements for process control in the pits. In turn, the present invention represents a further improvement of the control technologies of wastewater, based on measured and electrophysical parameters - conductivity and dielectric constant, and provide a method and system for control of sewage tanks, which will enable unambiguous control processes in the tank with the prediction of their future behavior.

This technical result is achieved by using the proposed method and system of automated control of the processes in the primary clarifiers, secondary clarifiers and/or settlers-lopatnitsa WWTP facilities sanitation housing.

The method of automated control of the processes in the primary clarifiers, secondary clarifiers and/or settlers-lopatnitsa WWTP facilities sanitation housing provides for continuous measurement of dielectric permittivity and conductivity, and temperature control points, distributed over the height of the tank and placed on a movable equipment, located inside the sump, when moving mobile equipment. The measured values of dielectric permittivity and conductivity are temperature records. Perform the control of the dynamics of change in the measured values of dielectric permittivity and specific elektroprovodnog and in time and/or relative to the base coordinate the design of the sump. Next, on the basis of measured values of dielectric permittivity and conductivity, reduced to a temperature of accounting, perform the final prediction of total level and/or properties for sediment or sludge in the sump with the possible selection of layers and predicting their level, and the final calculation of predicted values of moisture content of the sediment or sludge. In most cases, measurements are made when moving racks sludge scraper around the entire circumference of the tank.

Forecasting properties or level for sediment or sludge clarifiers can be performed based on the following conditions:

- a sharp increase in the values of dielectric permittivity and spasmodic growth of the conductivity determines the occurrence of the sensor in the environment of the sediment in the primary settling tank;

- a sharp decrease in the values of dielectric permittivity, and an abrupt decrease in the conductivity determines the output of the sensor from the environment of the sediment in the primary settling tank to the aquatic environment;

- long-term gradual increase in the values of conductivity at all levels of the sump determine the increase in the total mineralization of water going into the primary clarifier;

- dynamic changes of the conductivity and dielectric Pronichev and when moving mobile equipment identify the primary settling zone with different conditions of sedimentation, mainly sectoral areas;

- a sharp decrease in the values of dielectric permittivity and spasmodic growth of the conductivity determines the occurrence of the sensor in the environment of the secondary clarifier and/or lopatnits;

- slowly increase the dielectric constant and conductivity determine the compaction of silt and the increase of its concentration;

- long-term gradual increase in conductivity determine the salinity of runoff flowing in the secondary clarifier and/or lopatriello;

- increased dispersion measurements on the conductivity and the dielectric constant determines the movement of the transducer in a more dense and uneven sludge environments;

- dynamic changes of the conductivity and dielectric constant when moving mobile equipment identify zones with different levels of deposition of silt, predominantly sectoral zones.

The system of automated control of the processes in the primary clarifiers, secondary clarifiers and/or settlers-lopatnitsa WWTP facilities sanitation housing includes a set of primary converters of the capacitive type for measuring electrical capacitance (dielectric is historical permeability and electrical resistance (conductivity), as well as temperature, placed on a movable equipment, located inside the sump. In most cases, the primary transducers will be placed on the rod, mounted on the rack sludge scraper. With the primary converters are connected to the set of secondary converters that feed on the primary transducers of signals impact of specified frequency and amplitude and receiving the response, the instantaneous value of voltage and current transducers for further processing. Also, the proposed system of automatic control includes a programmable device and/or workstation control, connected to the secondary transducers wired and/or wireless communication channel. Programmable device and/or workstation provides the function of collecting, processing and storing information, including control of the dynamics of change in the measured values of permittivity and conductivity in time and/or regarding the design of the tank and forming a final forecast of the level and/or properties for sediment and/or sludge. Programmable device and/or workstation control can be connected to the system operational dispatch management of wastewater treatment facilities. In most of the cases, the programmable control device is placed on the rod, mounted on the rack sludge scraper in the case of the secondary converters.

Primary converters 1 capacitive type to provide measurement of electrical capacitance (dielectric constant), electrical resistance (conductivity)and temperature. Primary converters 1 are placed in the primary clarifier, secondary clarifier and youporntube treatment plant object sanitation housing. Primary converters 1 are located on any mobile equipment, located inside the sump, at the present time such movable equipment will be rod 2 mounted on the rack rotating sludge scraper 3. The primary transducer 1 is connected to the set (block) secondary converters 4, which supply on the primary converters 1 signals the impact of specified frequency and amplitude.

In response secondary converters 4 receive instantaneous values of voltage and current transducers 1 for subsequent recording and processing. Block secondary converters and register 4 is connected to the programmable device and/or the workstation control 5. For communication between the secondary converters 4 and the programmable device and/or AB is somatizirovanne workplace control 5 can be used wired or wireless communication channel. Currently, the programmable control device 5 will be placed on the rod, mounted on the rack sludge scraper in the case of the secondary transformers 4. In turn, the programmable device and/or workstation control 5 can be connected to the system operational dispatch management of wastewater treatment facilities 6.

Programmable device and/or workstation 5 provides the function of collecting, processing and storing information, including control of the dynamics of change in the measured values of permittivity and conductivity in time and/or relative to a reference coordinate design of the tank and forming a final forecast of the level and/or properties for sediment and/or sludge. Programmable device and/or workstation control 5 represent the hardware-software complex, specific architecture which is selected based on the characteristics of the treatment plant. When the system is a programmable device and/or workstation control 5 for each of the levels of control electrophysical parameters of the arrays of data obtained calculates the electric resistance and electric capacitance, which are further translated into specific show is whether: conductivity and dielectric permittivity, respectively.

Next, the calculated values of conductivity and dielectric permittivity are common conditions for temperature. Programmable device and/or workstation control 5 performs the selection of events abrupt change in time of dielectric permittivity and conductivity of the medium at the level of each sensor, the allocation of plots of dynamic growth and reduce the dielectric permittivity and conductivity, the subsequent automatic interpretation of detected events. Performed a summary analysis of events and the determination of the predicted values of the level of sediment and/or sludge on the known levels of the sensors, is the selection of layers in the sediment and determination of their levels on the known levels of the sensors.

In the end, the programmable device and/or workstation control 5 calculates predicted values sludge moisture on the measured values of dielectric permittivity and conductivity and established empirical formulas, and functions as a savings and archiving of control and, if necessary, their visualization.

The proposed method for the automated control of the processes in septic tanks WWTP is followed by the way.

In the primary sedimentation is the deposition of suspended solids and separation of pop-up grease from the incoming wastewater. Impurities having a higher density, are deposited on the bottom of the primary clarifier and periodically pumped to further utilization. Free from suspended solids and grease wastewater coming into the aeration tank to the next technological stage of the treatment. Measured level and the moisture content of the sludge is adjusted schedule pumping of septic tanks. The precipitate may delaminate and form at different levels of the tight formation that traditional methods of measurement can significantly distort the results. The number and quality characteristics of incoming water flows affect the moisture content of the sediment and the degree of purification of the environment coming for further purification steps.

In the secondary clarifier is the separation of sludge mixture from the aeration tank after biological treatment, activated sludge and purified water. The amount of sludge liquor is determined by the quantity of WWTP effluent. The sludge concentration is determined by the proportion of the amount of runoff flowing in the primary clarifiers, and the number of active sludge fed to the aeration tanks. Since the amount of activated sludge is a value conditionally constantly is, sludge concentration with increasing input stream falls. This reduces the residence time of the sludge mixture in the sump and, as a consequence, reduced the possibility of his deposition, decreases the density of the sludge in the lower layers of the sump. Precipitable active sludge is continuously withdrawn in the receiving tank of the activated sludge and then pumps to the inlet of the aeration tank, and partially as excess sludge in lopatriello. The moisture content of the sludge at the bottom levels of the tank, usually not lower than 99.5%. Currently operating modes of treatment facilities often cause an increase of the silt index, characterizing the inability to subsidence. In turn, this leads to the absence of sharp boundaries between environments, large dynamic fluctuations in the level and concentration of sludge and, consequently, decrease the efficiency and quality of treatment.

Accordingly, it requires the regulation of septic tanks based on the model described above the operation of the treatment facilities, which perform continuous measurement of dielectric permittivity and conductivity, and temperature control points, distributed over the height of the tank and placed on a movable equipment, located inside the sump when moving mobile equipment. Currently, measurements will be carried out during movement of the racks sludge scraper according to the present circumference of the sump. The measured values of dielectric permittivity and conductivity are temperature records. Perform the control of the dynamics of change in the measured values of permittivity and conductivity in time and/or on the design of the sump. Next, on the basis of measured values of dielectric permittivity and conductivity, reduced to a temperature of accounting, perform the final prediction of the level and/or properties for sediment and/or sludge in the sump with the possible selection of layers and predicting their level, and the final calculation of predicted values of moisture content.

Forecasting properties or level for sediment or sludge clarifiers can be performed based on the following conditions:

- a sharp increase in the values of dielectric permittivity and spasmodic growth of the conductivity determines the occurrence of the sensor in the environment of the sediment in the primary settling tank;

- a sharp decrease in the values of dielectric permittivity, and an abrupt decrease in the conductivity determines the output of the sensor from the environment of the sediment in the primary settling tank to the aquatic environment;

- long-term gradual increase in the values of conductivity at all levels of the tank determines the t increase in the total mineralization of wastewater, entering the primary clarifier;

- dynamic changes of the conductivity and dielectric constant when moving mobile equipment (the turnover of the sludge scraper) identify the primary settling zone with different conditions of sedimentation, mainly sectoral areas;

- a sharp decrease in the values of dielectric permittivity and spasmodic growth of the conductivity determines the occurrence of the sensor in the environment of the secondary clarifier and/or lopatnits;

- slowly increase the dielectric constant and conductivity determine the compaction of silt and the increase of its concentration;

- long-term gradual increase in conductivity determine the salinity of runoff flowing in the secondary clarifier and/or lopatriello;

- increased dispersion measurements on the conductivity and the dielectric constant determines the movement of the transducer in a more dense and uneven sludge environments;

- dynamic changes of the conductivity and dielectric constant when moving mobile equipment (the turnover of the sludge scraper) distinguish areas with different levels of deposition of silt, predominantly sectoral zones.

Thus, the proposed method and C is theme for the automated control of the processes in the primary clarifiers, secondary settling ponds and/or tanks-lopatnitsa WWTP facilities sanitation housing that will ensure reliable and uninterrupted control of the technological process in the pits.

1. The method of automated control of the processes in the primary clarifiers, secondary clarifiers and/or settlers-lopatnitsa WWTP facilities sanitation housing, including
continuous measurement of dielectric permittivity and conductivity, and temperature control points, distributed over the height of the tank and placed on a movable equipment, located inside the sump when moving mobile equipment;
the conversion of the measured values of dielectric permittivity and conductivity to the temperature of accounting;
control of the dynamics of change in the measured values of permittivity and conductivity in time and/or relative to the base coordinate the design of the sump;
the final prediction of total level and/or properties for sediment or sludge in the sump with the possible selection of layers and predicting their level, and the final calculation of predicted values of moisture content of sludge or sludge on the basis of the measured values dialect the practical permeability and conductivity, refer to the temperature of accounting.

2. The method according to claim 1, characterized in that a sharp increase in the values of dielectric permittivity and spasmodic growth of the conductivity determines the occurrence of the sensor in the environment of the sediment in the primary settling tank.

3. The method according to claim 1, characterized in that a sharp decrease in the values of dielectric permittivity, and an abrupt decrease in the conductivity determines the output of the sensor from the environment of the sediment in the primary settling tank to the aquatic environment.

4. The method according to claim 1, characterized in that the long-term gradual increase in the values of conductivity at all levels of the sump determine the increase in the total mineralization of water going into the primary clarifier.

5. The method according to claim 1, characterized in that the dynamic changes of the conductivity and dielectric constant when moving mobile equipment identify the primary settling zone with different conditions of sedimentation, mainly sectoral zones.

6. The method according to claim 1, characterized in that a sharp decrease in the values of dielectric permittivity and spasmodic growth of the conductivity determines the occurrence of the sensor in the environment of the secondary clarifier and/or lopatnits.

7. way according to claim 1, characterized in that a slow increase of dielectric permittivity and conductivity to determine the compaction of silt and increase his concentration.

8. The method according to claim 1, characterized in that the long-term gradual increase in conductivity determine the salinity of runoff flowing in the secondary clarifier and/or lopatriello.

9. The method according to claim 1, characterized in that the increased dispersion measurements on the conductivity and the dielectric constant determines the movement of the transducer in a more dense and uneven sludge environments.

10. The method according to claim 1, characterized in that the dynamic changes of the conductivity and dielectric constant when moving mobile equipment identify zones with different levels of deposition of silt, predominantly sectoral zones.

11. The method according to any one of claims 1 to 10, characterized in that the above measurements are made when moving racks sludge scraper around the entire circumference of the tank.

12. The system of automated control of the processes in the primary clarifiers, secondary clarifiers and/or settlers-lopatnitsa WWTP facilities sanitation housing, including
the set of transducers capacitive type measurement ELEH the electrical capacitance (dielectric constant) and electrical resistance (conductivity), as well as temperature, placed on a movable equipment, located inside the sump,
the totality of the secondary of the transformers connected to the primary converters that feed on the primary transducers of signals impact of specified frequency and amplitude and receiving the response, the instantaneous value of voltage and current transducers for further processing,
programmable device and/or workstation control, connected to the secondary transducers wired and/or wireless communication channel,
with the functions of collecting, processing and storing information, including control of the dynamics of change in the measured values of permittivity and conductivity in time and/or on the design of the sump and forming the final forecast of the level and/or properties for sediment and/or sludge.



 

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2 cl, 5 ex, 1 tbl

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FIELD: measurement equipment.

SUBSTANCE: invention may be used in systems of water-chemical regime control for thermal, nuclear and industrial power engineering. The method to determine concentration of components in a mixture of highly diluted strong electrolytes includes simultaneous measurement of specific electric conductivity and temperature of analysed solution under different temperatures in quantity equal to quantity of components of the solution, solving a system of equations of electric conductivity in the quantity equal to the number of measurements, each of which has a certain type, with determination of specific electric conductivity values when solving equations at the temperature of 18C for each of the mixture components and find the corresponding concentration by available (reference) data.

EFFECT: invention simplifies the process due to direct determination of concentration of each component within the composition of the solution.

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