KR101930250B1 - Automatic Control System of Coagulation and Flocculation - Google Patents

Abstract

The flocculant automatic control system of the present invention comprises a flow meter for measuring the flow rate of inflow water flowing from the outside; A first turbidity sensor for measuring the turbidity of the influent water; The solids volume of the influent water and the settling velocity of the solids are measured by a first settling measurement sensor; A first flocculant supply part supplying a first flocculant composed of any one of aluminum sulfate, aluminum chloride, and iron salts having an oxidizing property to the influent water; A pH sensor for measuring the pH of the inflow water into which the first flocculant is introduced; A pH adjusting agent supply unit for supplying a pH adjusting agent to the influent water to which the first flocculant is added; a second flocculant supply unit for supplying a second flocculant to the pH-adjusted influent; A second turbidity sensor for measuring the turbidity of the influent water into which the second coagulant is introduced; A second sedimentation measuring sensor for measuring a solids volume of the influent water into which the second flocculant is injected and a sedimentation velocity of the solids; The first flocculant feeder and the second flocculant feeder are operated under operating conditions consistent with the flow rate information delivered from the flow meter, the turbidity information transmitted from the first turbidity sensor, the solids volume of the influent water sent from the first settling measurement sensor, The pH control agent supply unit controls the operation of the first flocculant supply unit and the second flocculant supply unit so that the supply unit is operated and controls the operation of the first flocculant supply unit and the second flocculant supply unit so that the amount of the pH adjuster supplied into the inflow water, And controls the operation of the first coagulant feeder and the second coagulant feeder in accordance with the turbidity information transmitted from the second turbidity sensor, the solids volume of the influent water sent from the second settling measurement sensor, and the correction coefficient corresponding to the settling velocity information of the solids, The first flocculant supply unit and the second flocculant supply unit are provided so that the input amounts of the first flocculant and the second flocculant, A control unit for controlling the operation of the coagulant supply unit; And a display that displays the flow rate, turbidity, solids concentration, solids volume, solids precipitation rate, and pH of the influent.

Description

[0001] The present invention relates to an automatic control system for coagulation,

The present invention relates to an automatic flocculant regulating system, and more particularly, to an automatic flocculant regulating system capable of automatically adjusting the amount of flocculant to the total amount of solids by monitoring in real time the concentration change, the characteristic and the flow rate of the solids in the sewage or wastewater or sludge, And an automatic flocculant regulating system.

As the modern industry develops, various factories produce a large amount of sewage due to industrial wastewater which is harmful to the human body and the convenience of life, and if such sewage or wastewater is discharged without permission, the natural environment is polluted and the ecosystem can be maintained The sewage is purified and discharged.

Recently, the problem of the purification of sewage or wastewater is becoming a serious environmental problem, and apparatuses and methods for purifying sewage by a cleaner and simpler method are being developed.

In general sewage treatment process, when the sewage to be purified is generated, the coarse substance mixed in the sewage is filtered out from the screen, and the inorganic substance which is easy to precipitate such as sand and grit mixed with sewage is precipitated and separated The separated supernatant is evenly mixed in the flow control tank and transferred to the primary clarifier at a constant flow rate.

The organic and inorganic solids that remain suspended for a relatively long period of time in the primary clarifier are separated, and the dissolved contaminants that have not been removed are treated in the bioreactor and converted into floc by the microorganisms in the bioreactor Is introduced into the second settling tank through a sedimentation process. In this case, a coagulant is introduced in order to solve the problem caused by poor settling property of the second settling tank in the intermediate process of being transferred from the bioreactor to the second settling tank .

The coagulant is a chemical that coagulates the colloidal particles dispersed in the raw water in the floc form by neutralizing and bridging the Zeta potential. Most of the colloidal particles are negatively charged, A coagulant suitable for reactivity is appropriately used to flocculate in the form of flocs by neutralization and crosslinking.

Such flocculants regulate the rate of injection proportionally due to fluctuating flow rates for the treatment of solids contained in the fluid during conventional sewage or wastewater treatment. However, since the concentration of solids in wastewater or wastewater or the wastewater flowing into the wastewater changes or the characteristics change, it is difficult to monitor the change in solids concentration or characteristics of wastewater when the coagulant is added. Therefore, It was difficult to maintain the reactivity or to operate the sewage or wastewater treatment facility.

Korean Patent Registration No. 10-1620533

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for monitoring the concentration change, characteristics and flow rate of solids in sewage or wastewater or sludge, And to provide an adjustable flocculant auto-regulating system.

According to an aspect of the present invention, there is provided a flocculant automatic control system comprising: a flow meter for measuring a flow rate of inflow water flowing from the outside; A first turbidity sensor for measuring the turbidity of the influent water; The solids volume of the influent water and the settling velocity of the solids are measured by a first settling measurement sensor; A first flocculant supply part supplying a first flocculant composed of any one of aluminum sulfate, aluminum chloride, and iron salts having an oxidizing property to the influent water; A pH sensor for measuring the pH of the inflow water into which the first flocculant is introduced; A pH adjusting agent supply unit for supplying a pH adjusting agent to the influent water to which the first flocculant is added; a second flocculant supply unit for supplying a second flocculant to the pH-adjusted influent; A second turbidity sensor for measuring the turbidity of the influent water into which the second coagulant is introduced; A second sedimentation measuring sensor for measuring a solids volume of the influent water into which the second flocculant is injected and a sedimentation velocity of the solids; The first flocculant feeder and the second flocculant feeder are operated under operating conditions consistent with the flow rate information delivered from the flow meter, the turbidity information transmitted from the first turbidity sensor, the solids volume of the influent water sent from the first settling measurement sensor, The pH control agent supply unit controls the operation of the first flocculant supply unit and the second flocculant supply unit so that the supply unit is operated and controls the operation of the first flocculant supply unit and the second flocculant supply unit so that the amount of the pH adjuster supplied into the inflow water, And controls the operation of the first coagulant feeder and the second coagulant feeder in accordance with the turbidity information transmitted from the second turbidity sensor, the solids volume of the influent water transmitted from the second settling measurement sensor, and the correction coefficient corresponding to the settling velocity information of the solids, The first flocculant supply unit and the second flocculant supply unit are provided so that the input amounts of the first flocculant and the second flocculant, A control unit for controlling the operation of the coagulant supply unit; And a display that displays the flow rate, turbidity, solids concentration, solids volume, solids precipitation rate, and pH of the influent.

According to the present invention, the control unit controls the amount of the first coagulant input and the amount of the second coagulant to be supplied as inflow water from the first coagulant supply unit and the second coagulant supply unit, respectively, to the first turbidity sensor, The first coagulant input amount and the second coagulant input amount, which are respectively input to the influent water at present, are the coagulant coagulant coincident with the operation conditions transmitted from the first turbidity sensor and the first precipitation measurement sensor, And controls the operation of the first and second coagulant feed units and the second coagulant feed units so that the first coagulant feed amount and the second coagulant feed amount input to the influent water from the first coagulant feed unit and the second coagulant feed unit are decreased, The input amount of the first flocculant and the amount of the second flocculant to be supplied are controlled by the first turbidity sensor and the operation tank And controls the operation of the first and second coagulant supply units and the second coagulant supply unit such that the first coagulant input amount and the second coagulant input amount input to the influent water are increased at the first coagulant supply unit and the second coagulant supply unit, .

According to the present invention, when the pH value transmitted from the pH sensor is greater than the pH value in the neutral range, the control unit controls the operation of the pH adjusting agent supplying unit so that the amount of the pH adjusting agent supplied to the inflow water into which the first flocculating agent is input is increased, The controller controls the operation of the pH adjusting agent supplying unit so that the amount of the pH adjusting agent supplied to the influent having the first flocculating agent is reduced when the pH value transmitted from the sensor is smaller than the pH value of the neutral range.

According to the present invention, when the data transmitted from at least one of the second turbidity sensor and the second sedimentation measurement sensor is within the reference value range, the control unit controls the operation of the first coagulant supply unit, the pH adjuster supply unit, and the second coagulant supply unit And data transmitted from at least one of the second turbidity sensor and the second settling measurement sensor is transmitted when the data transmitted from at least one of the second turbidity sensor and the second settling measurement sensor is lower than the reference value range Controls the operation of the first coagulant supply unit and the second coagulant supply unit so that the amount of the first coagulant input and the amount of the second coagulant supplied are increased until the first coagulant input amount and the second coagulant supply amount are within the reference value range, The data transmitted from at least one of the second turbidity sensor and the second settling measurement sensor is < RTI ID = 0.0 > The first flocculant and the second flocculant dosage amount reduced until entering into the range of values to be given is characterized in that for controlling the first flocculating agent supply unit and the second operation of the flocculant supply.

The present invention relates to a method and apparatus for monitoring the change and characteristics of solids concentration of a sludge generated in a process of treating solid water, sewage or wastewater contained in an influent or sewage in real time and measuring at least any one of an inorganic flocculant and an organic flocculant And the turbidity of the flocculation filtrate and the sedimentation rate for the flocculated flocculus are measured to judge the appropriateness of the flocculation, so that the stable operation can be performed.

1 is a view showing an automatic flocculant regulating system according to an embodiment of the present invention.
2 is a view showing measurement results measured by a sedimentation measuring sensor.
3 is a graph showing a correlation between a change in suspended solid concentration (SS) contained in the influent water and a solids volume (SV).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following detailed description of the operation principle of the preferred embodiment of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings.

In addition, when a part is referred to as being "connected" to another part throughout the specification, it includes a case where the part is indirectly connected with another part in between, in addition to the case where it is directly connected. Also, to "comprise" an element means not to exclude other elements but to include other elements, unless specifically stated otherwise.

1 is a view showing an automatic flocculant regulating system according to an embodiment of the present invention.

1, a flocculant automatic control system according to an embodiment of the present invention includes a flow meter 10 for measuring the flow rate of inflow water (for example, wastewater, sewage, sludge, etc.) The first sedimentation sensor 32, the first flocculant supply part 42 for supplying the first flocculant to the inflow water, the first flocculant supply part 42 for supplying the influent water with the first flocculant, A pH controller 50 for measuring a hydrogen ion concentration (pH) of the first flocculating agent, a pH adjusting agent supplying part 52 for supplying a pH adjusting agent to the inflow water into which the first flocculating agent has been introduced, A second turbidity sensor 24 for measuring the turbidity of the influent water into which the second flocculant has been introduced, a second sedimentation measuring sensor 34 for measuring the settling velocity of the solids volume and the solids of the inflow water into which the second flocculant has been introduced, , The flow rate measured by the flow meter 10 The turbidity information of the influent water measured in the first turbidity sensor 22 and the second turbidity sensor 24, the solids volume of the influent measured in the first and second settling measurement sensors 32 and 34, A controller 60 for controlling the operation of the first flocculant feeder 42, the pH adjuster feeder 52 and the second flocculant feeder 44 according to the settling velocity information of the first flocculant feeder 44, the pH value measured by the pH sensor 50, A display 70 indicating the influent flow, turbidity, solids concentration, solids volume, solids settling velocity, pH, and the like.

The flocculant automatic control system according to the embodiment of the present invention may further include an input unit (not shown) for receiving data from a user.

The flow meter 10 is a device for measuring the flow rate of influent water flowing from the outside. The flow meter 10 measures the flow rate of wastewater or sewage and sludge supplied to the secondary settler in a biological reactor, installed in the piping between the bioreactor and the secondary settler, The flow rate of the inflow water that is provided between the pressurized floating vessel and the pressurized floating vessel can be measured. However, the present invention is not limited thereto.

The first turbidity sensor 22 measures the turbidity of the influent water and transmits the measured turbidity information to the control unit 60. The first turbidity sensor 22 may be any of known turbidity sensors such as those disclosed in Japanese Patent No. 10-1466384 and Japanese Patent No. 10-1724165. In the present invention, however, And a turbidity sensor which is detected as a (-) value and detected as a (+) value when the solids concentration is above a predetermined value.

The first settling measurement sensor 32 measures the settling velocity of the inflow water supplied with a portion of the inflow water and the volume of the solid contained in the influent water. The first settling measurement sensor 32 may have any structure as long as it can measure the settling velocity or the volume of the solid material. In the present invention, the "first settling measurement sensor 32" Measuring device ".

The measured values measured at the first settling measurement sensor 32 are transmitted to the display 70 via the control unit 60 or directly to the display 70 so that the user can measure the measured values at the first settling measurement sensor 32 The measured value is displayed so that it can be confirmed in real time. The solids volume measured by the first settling measurement sensor 32 is represented by several levels (for example, 15 Lv) as shown in FIG.

The first flocculant feeder 42 supplies a first flocculant having oxidizing properties to flocculate the solids in the influent. The first flocculant supply part 42 is a place where an inorganic flocculant called a coagulant is supplied to the inflow water in order to alleviate the zeta potential characteristic of the solid contained in the inflow water and to alleviate the Van der Waals force, Aluminum sulfate, Poly Aluminum Chloride (PAC), iron salt, and the like are used.

The pH sensor 50 measures the hydrogen ion concentration (pH) of the inflow water into which the first flocculant is introduced, and is installed at the same place as the first turbidity sensor 22.

The pH adjusting agent supply unit 52 supplies the pH adjusting agent to the influent having the first flocculating agent introduced thereto so that the influent having the first flocculating agent kept in the neutral range pH is maintained. When the pH adjuster is supplied to the inflow water into which the first flocculant is introduced, the pH of the water can be stabilized. When the second flocculant is supplied to the inflow water after the flocculation reaction in the inflow water by the supply of the first flocculant, .

The second flocculant feeder 44 supplies a second flocculant (i.e., an organic coagulant) to the pH-adjusted influent to make the solids particles larger through the crosslinking action of the solids. As the second coagulant, polyacrylamide, polyethyleneimine, polydialdimethylammonium chloride, polyamine and the like having high molecular weight may be used.

The second turbidity sensor 24 measures the turbidity of the inflow water into which the second flocculant is introduced. Since the second turbidity sensor 24 has the same function and configuration as the first turbidity sensor 22, detailed description thereof will be omitted.

The second settling measurement sensor 34 receives a part of the influent water into which the second flocculant is introduced, and measures the settling velocity of the inflow water and the volume of the solid material. Since the second settling measurement sensor 34 has the same function and configuration as the first settable measurement sensor 32, a detailed description thereof will be omitted.

The control unit 60 receives the flow rate information of the influent water supplied from the flow meter 10, the turbidity of the influent water supplied from the first turbidity sensor 22 and the first sedimentation measurement sensor 32, the volume and sedimentation rate information of the solids, The amount of the first flocculant supplied to the influent water from the first flocculant supply unit 42, the amount of the pH adjuster supplied to the influent water from the pH adjusting agent supply unit 52, the amount of the second flocculant supply unit 44, The amount of the second flocculant supplied to the inflow water into which the first flocculant is introduced is controlled.

The display 70 displays the flow rate information of the influent water, the turbidity information of the influent water, the solids volume and solids concentration of the influent water, the pH of the influent water into which the first flocculant is introduced, the amount of the first flocculant, 2 flocculant provides the user with information such as turbidity, solids volume and solids concentration of influent input.

The display 70 includes a flow meter 10, a first turbidity sensor 22 and a second turbidity sensor, a first settling measurement sensor 32 and a second settled measurement sensor 34, Data is directly supplied or data to be displayed is supplied from the control unit 60.

On the other hand, when the measured value measured by the sediment measuring sensor is displayed on the display 70, the display 70 displays the start setting, standby setting, start time, and standby time so that the user can set the measurement time of the sediment measuring sensor Provide the user with a setup window that can be set,

The automatic flocculant regulating system of the present invention having the above-described structure according to the present invention can control the flocculant solubility, turbidity, pump speed of the first flocculant supply part 42, The supply flow rate of the second flocculant depending on the supply flow rate of the first flocculant depending on the pump speed of the supply part 42, the pump speed of the second flocculant supply part 44 and the pump speed of the second flocculant supply part 44, And is stored in a database (not shown) in the control unit 60. [

As shown in FIG. 3 and Table 1, the volume of solids contained in the influent water increases as the concentration of Suspended Solids (SS) contained in the influent water increases, indicating that the solids volume (SV) .

It can be seen that the turbidity information of the influent water measured by the first turbidity sensor 22 and the solids volume measured by the first sedimentation measuring sensor 32 are matched with each other at a ratio of 1: 1.

That is, when the solids volume level measured at the first sedimentation measuring sensor 32 is 5 as shown in Table 1, the turbidity value measured at the first turbidity sensor 22 is +255.9 mV, and the first sedimentation measurement When the solids volume level measured at the sensor 32 is 9, the turbidity value measured at the first turbidity sensor 22 is +477.09 mV.

On the other hand, when the flow rate of the influent water is maintained at a constant value (for example, 3.0 L / min), the total amount of solids, solids volume and turbidity increases as the solids concentration increases, And the pH value decreases as the concentration of the first flocculant (ie, PAC, aluminum sulfate, iron salt, etc.) added to the influent water increases as shown in Table 4.

The numerical values set forth in the above Tables 1 to 4 are only examples for implementing the flocculant self-regulating system of the present invention, but the present invention is not limited thereto.

Solids volume
Lv Turbidity (mV) PAC Anion Polymer Pump speed
(rpm) flux
(L / min) Pump speed
(rpm) flux
(L / min) One -330.7 4.28 4.0 17.13 16.0 2 -273.2 4.28 4.0 17.13 16.0 3 +51.0 6.40 6.0 25.70 24.0 4 +68.1 6.40 6.0 25.70 24.0 5 +255.9 6.40 6.0 25.70 24.0 6 +318.0 9.63 9.0 38.55 36.0 7 +371.3 9.63 9.0 38.55 36.0 8 +423.7 13.91 13.0 38.55 36.0 9 +477.0 13.91 13.0 38.55 36.0 10 +530.3 16.05 15.0 64.25 60.0 11 +582.7 16.05 15.0 64.25 60.0 12 +636.0 16.05 15.0 64.25 60.0 13 or more +689.3 19.26 18.0 77.10 72.0

Solids concentration (mg / L) Total amount (kg / hr) SV (%) Turbidity (mV) 0 0.000 0 -365.5 125 0.023 4 -3.4.0 150 0.027 6 -297.5 375 0.067 8 -214.0 575 0.104 10 -158.0 650 0.117 15 -70.5 850 0.153 20 51 1450 0.261 30 230.5 1650 0.297 40 318

Influent pump
flux
Increase / decrease rate
(%) Change in total amount (kg / hr) inverter
speed
(Hz) flux
(L / min) SS
125
mg / L SS
150
mg / L SS
375
mg / L SS
575
mg / L SS
650
mg / L SS
850
mg / L SS
1,450
mg / L SS
1,650
mg / L 10 2.0 -33.3 0.015 0.018 0.045 0.069 0.078 0.102 0.174 0.198 20 4.0 +25.0 0.030 0.036 0.090 0.138 0.156 0.204 0.348 0.396 30 6.0 +50.0 0.045 0.054 0.135 0.207 0.234 0.306 0.522 0.594 40 8.0 +62.5 0.060 0.072 0.180 0.276 0.312 0.408 0.696 0.792 50 10.0 +70.0 0.075 0.090 0.225 0.345 0.390 0.510 0.870 0.990 60 12.0 +75.0 0.090 0.108 0.270 0.414 0.468 0.612 1.044 1.188

PAC injection amount
(mL / min) Influent flow
prepare
PAC Ratio (%) PAC injection
pH pH adjusting agent Pump speed (rpm) Flow rate (mL / min) One 0.033 6.0 0.6 0.6 2 0.067 5.2 1.3 1.2 3 0.100 4.0 1.9 1.8 4 0.133 3.9 2.6 2.4 5 0.167 3.9 3.2 3.0 6 0.200 3.7 3.9 3.6 7 0.233 3.6 4.5 4.2 8 0.267 3.6 5.1 4.8 9 0.300 3.5 5.8 5.4 10 0.333 3.5 6.4 6.0 11 0.367 3.4 7.1 6.6 12 0.400 3.4 7.7 7.2 13 0.433 3.4 8.3 7.8

Hereinafter, an operation method of the flocculant automatic control system of the present invention will be described.

When the sludge generated in the inflow wastewater or the sewage, sewage or wastewater treatment is supplied from the flow control tank or the bioreactor for the pressurized floating tank, the secondary settling tank or the sludge dehydration, the flow meter 10 measures the flow rate of the incoming wastewater or sewage And then transmits the measured flow rate information to the control unit 60.

When the flow rate of influent water is measured by the flow meter 10, it flows into sewage or wastewater or a sludge storage tank (not shown) capable of temporarily storing inflow wastewater or sludge generated during sewage or sewage or wastewater treatment, 1 turbidity sensor 22 measures the turbidity of the influent water stored in the sewage or wastewater and the sludge storage tank, and then transmits the turbidity information of the measured influent water to the controller 60.

In addition, when the inflow water flows into the wastewater storage tank (not shown), the first settling measurement sensor 32 measures the settling velocity and the settling degree (that is, the volume of the solids) of the inflow water flowing into the wastewater storage tank And transmits the sedimentation velocity and the solids volume information of the measured influent water to the controller 60.

Meanwhile, the controller 60 controls the amount of the first flocculant to be supplied in accordance with the flow rate information transmitted from the flow meter 10, the turbidity information input from the first turbidity sensor 22, and the solid volume information input from the first settlement measurement sensor 32 Extracted from the database and then compared with the first coagulant input at the first coagulant feeder (42).

In other words, the control unit 60 supplies a flow rate value of 3.0 L / min in the flow meter 10, a turbidity value of + 371.3 mV in the first turbidity sensor 22, as shown in Table 1, The first coagulant input amount (i.e., the PAC feed pump speed 9.63 rpm or the PAC feed flow rate 9.0 L / min in Table 1), which is input to the influent water in the first coagulant feeder 42 when 7-level solids volume is transmitted from the sensor 32, min) is extracted from the internal look-up table, and is compared with the first coagulant input amount (that is, the PAC feed pump speed or the flow rate) at the present first coagulant feeder 42.

At this time, if the amount of the first coagulant supplied to the first coagulant supply unit 42 is the same as the amount of the first coagulant supplied from the lookup table, the current state is maintained (i.e., the operation of the first coagulant supply unit 42 is maintained) , The pump speed of the first flocculant supply part (42) is set to the first flocculant supply part (42) of the lookup table when the amount of the first flocculant introduced into the influent water from the first flocculant supply part (42) The first coagulant feed amount of the first coagulant feeder 42 is smaller than the first coagulant feed amount extracted from the lookup table, The pump speed of the first flocculant supply part 42 is increased to the pump speed of the first flocculant supply part 42 of the look-up table (i.e., the first PAC supply pump speed 9.63 rpm) to increase the first flocculant load.

The pH sensor 50 measures the pH of the influent water into which the first coagulant has been added and transmits the measured pH to the controller 60 when the first coagulant is input to the influent water in a state where the input amount is controlled by the controller 60.

As the first flocculant added to the influent water increases in the first flocculant supply unit 42 as described above, the pH decreases as shown in Table 4. When the pH transferred from the pH sensor 50 to the control unit 60 is in the neutral range (I.e., when the pH value sent from the pH sensor 50 to the control unit 60 is less than or greater than the pH value in the neutral range), the control unit 60 controls the first flocculant to neutralize the inflow water (I.e., when the pH value sent to the controller 60 is greater than the pH value in the neutral range) or decreases (i.e., when the pH value sent to the controller 60 is less than the pH value in the neutral range) ) To control the pump speed of the pH adjuster supply part

When the pH control agent is input to the influent water in a state where the input amount is adjusted to neutralize the pH of the influent water into which the first flocculant is added, the control unit 60 controls the flow rate of the influent water supplied from the flow rate meter 10 and the first turbidity sensor 22 The second coagulant input amount corresponding to the input turbidity information and the solid matter volume information input from the first settling measurement sensor 32 is extracted from the database and is compared with the second coagulant input amount inputted into the influent water from the second coagulant supply unit 44. [

At this time, if the amount of the second coagulant supplied to the second coagulant supply unit 44 is the same as the amount of the second coagulant supplied from the lookup table, the current state is maintained (i.e., the current operation of the second coagulant supply unit 44 is maintained) The pump speed of the second flocculant supply unit 44 is set to the second flocculant supply unit (not shown) of the lookup table when the second flocculant input amount inputted into the influent water from the second flocculant supply unit 44 is greater than the second flocculant input amount extracted from the look- The second coagulant feed unit 44 reduces the amount of the second coagulant supplied to the second coagulant feed unit 44 when the amount of the second coagulant introduced into the influent water from the second coagulant feed unit 44 is smaller than the amount of the second coagulant extracted from the lookup table, Up pump speed to the second coagulant feed 44 pump speed in the look-up table to increase the second coagulant charge.

The second turbidity sensor 24 and the second precipitation measurement sensor 34 measure the turbidity, sedimentation velocity, suspended solids volume, and solids volume of the inflow water into which the second coagulant has been introduced as described above, and then transmit the measurement result to the controller 60 .

When the turbidity, sedimentation velocity, suspended solids volume and solids volume information measured by the second turbidity sensor 24 and the second sedimentation sensor 34 are transmitted to the controller 60, the controller 60 controls the second turbidity sensor And compares the data transmitted from the first settling measurement sensor 24 and the second settling measurement sensor 34 with a reference value range stored in an internal database.

At this time, when the data transmitted from at least one of the second turbidity sensor 24 and the second settling measurement sensor 34 is within the reference value range, the controller 60 determines that the coagulation is properly performed, The second turbidity sensor 24 and the second settling measurement sensor 34 in the present state while keeping the operations of the first pH sensor 42, the pH adjusting agent supply unit 52 and the second coagulant supply unit 44 in the current state, If the data are out of the reference value range, it is judged that the flocculation process is not performed properly. As shown in Table 5, after correcting the amount of the first flocculant (ie, PAC) and the second flocculant (ie, anionic polymer) Thereby controlling the operation of the first flocculating agent supply part 42, the pH adjusting agent supplying part 52 and the second flocculating agent supplying part 44.

In other words, when the data transmitted from at least one of the second turbidity sensor 24 and the second settling measurement sensor 34 is lower than the reference value range, the control unit 60 determines that the flow rate of the entire inflow water has been increased (I.e., PAC) and a second coagulant (i.e., anion polymer) until the data transmitted from at least one of the second turbidity sensor 24 and the second settling measurement sensor 34 falls within a reference value range, If the data transmitted from at least one of the second turbidity sensor 24 and the second settling measurement sensor 34 is higher than the reference value, it is determined that the flow rate of the entire influent water has decreased, (I.e., PAC) and the amount of the second flocculant (i.e., anion polymer) are decreased until the data transmitted from at least one of the first sedimentation measurement sensor 24 and the second sedimentation measurement sensor 34 falls within the reference value range .

On the other hand, in Table 5, the (-) value means that the present input amount of the first coagulant and the second coagulant is lower than the previous input amount, and the (+) value indicates that the current amount of the first coagulant and the second coagulant are increased And 1.25, 1.50, and 1.60 in the PAC change flow rate means to increase 25%, 50%, and 60%, respectively.

Influent pump PAC Anion Polymer Inflow pump
Inverter speed (Hz) Influent
Flow rate (L / min) flux
Rate of increase / decrease (%) Change flow flux
Rate of increase / decrease (%) Change flow 10 2.0 33.3 × (-1.33) 33.3 × (-1.33) 20 4.0 25.0 × (+1.25) 25.0 × (+1.25) 30 6.0 50.0 × (+1.50) 50.0 × (+1.50) 40 8.0 62.5 × (+1.63) 62.5 × (+1.63) 50 10.0 70.0 × (+1.70) 70.0 × (+1.70) 60 12.0 75.0 × (+1.75) 75.0 × (+1.75)

In the above description, the numerical values shown in Tables 1 to 5 are only one example for explaining the automatic flocculating agent control system of the present invention, and the numerical values shown in Tables 1 to 5 Can be changed.

As described above, the flocculant automatic control system according to the embodiment of the present invention can monitor the change and characteristics of solids concentration in the inflow water or the sludge in real time and appropriately adjust the amount of the inorganic flocculant and the organic flocculant The turbidity of the coagulated filtrate after the addition of the coagulant and the sedimentation rate for the coagulated flocs are measured to determine the suitability of the coagulation, which makes stable operation possible.

Although the present invention has been described in connection with the preferred embodiments thereof, it should be understood that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention. Accordingly, the scope of the present invention should not be limited to the described embodiments, but should be defined by the following claims as well as equivalents thereof.

10: Flow meter 22, 24: Turbidity sensor
32, 34: settling measurement sensor 42, 44: coagulant supply unit
50: pH sensor 52: pH adjuster supplier
60: control unit 70: display

Claims (4)

A flow meter for measuring the flow rate of the inflow water flowing from the outside;
A first turbidity sensor for measuring the turbidity of the influent water;
The solids volume of the influent water and the settling velocity of the solids are measured by a first settling measurement sensor;
A first flocculant supply part supplying a first flocculant composed of any one of aluminum sulfate, aluminum chloride, and iron salts having an oxidizing property to the influent water;
A pH sensor for measuring the pH of the inflow water into which the first flocculant is introduced;
A pH adjusting agent supply unit for supplying a pH adjusting agent to the influent water to which the first flocculant is added;
a second flocculant supply unit for supplying a second flocculant to the pH-adjusted influent;
A second turbidity sensor for measuring the turbidity of the influent water into which the second coagulant is introduced,
A second sedimentation measuring sensor for measuring a solids volume of the influent water into which the second flocculant is injected and a sedimentation velocity of the solids;
The first flocculant feeder and the second flocculant feeder are operated under operating conditions consistent with the flow rate information delivered from the flow meter, the turbidity information transmitted from the first turbidity sensor, the solids volume of the influent water sent from the first settling measurement sensor, The pH control agent supply unit controls the operation of the first flocculant supply unit and the second flocculant supply unit so that the supply unit is operated and controls the operation of the first flocculant supply unit and the second flocculant supply unit so that the amount of the pH adjuster supplied into the inflow water, And controls the operation of the first coagulant feeder and the second coagulant feeder in accordance with the turbidity information transmitted from the second turbidity sensor, the solids volume of the influent water transmitted from the second settling measurement sensor, and the correction coefficient corresponding to the settling velocity information of the solids, The first flocculant supply unit and the second flocculant supply unit are provided so that the input amounts of the first flocculant and the second flocculant, A control unit for controlling the operation of the coagulant supply unit; And
And a display that displays the flow rate, turbidity, solids volume, solids settling velocity, and pH of the influent water. The method according to claim 1,
The control unit may control the amount of the first coagulant supplied and the amount of the second coagulant to be supplied to the first and second coagulant supply units and the second coagulant supply unit respectively to the coagulant input amount , If the first coagulant input amount and the second coagulant input amount that are respectively input to the influent water are greater than the coagulant input amount that matches the operation conditions transmitted from the first turbidity sensor and the first precipitation measurement sensor The first coagulant supply unit and the second coagulant supply unit control the operation of the first coagulant supply unit and the second coagulant supply unit so that the amount of the first coagulant supplied and the amount of the second coagulant introduced into the inflow water are reduced, The input amount and the amount of the second flocculant are matched with the operating conditions transmitted from the first turbidity sensor and the first sedimentation measuring sensor And controls the operation of the first coagulant supply unit and the second coagulant supply unit so that the first coagulant input amount and the second coagulant input amount input to the influent water are increased in the first coagulant supply unit and the second coagulant supply unit, Coagulant self - regulating system. The method according to claim 1,
Wherein the control unit controls the operation of the pH adjusting agent supplying unit so that the amount of the pH adjusting agent supplied to the influent having the first flocculating agent is increased when the pH value transmitted from the pH sensor is greater than the pH value of the neutral range, Wherein the operation of the pH adjusting agent supply unit is controlled so that the amount of the pH adjusting agent supplied to the inflow water into which the first flocculating agent is charged is reduced when the pH of the flocculating agent is less than the pH value of the neutral range. The method according to claim 1,
When the data transmitted from at least one of the second turbidity sensor and the second sedimentation measurement sensor is within the reference value range, the controller maintains the operation of the first coagulant supply unit, the pH adjuster supply unit and the second coagulant supply unit in the current state , Data transmitted from at least one of the second turbidity sensor and the second settling measurement sensor falls within the reference value range when the data transmitted from at least one of the second turbidity sensor and the second settling measurement sensor is lower than the reference value range The operation of the first coagulant supply unit and the second coagulant supply unit is controlled so that the amount of the first coagulant supplied and the amount of the second coagulant supplied are increased until the data transmitted from at least one of the second turbidity sensor and the second coagulant measurement sensor reaches the reference value The data transmitted from at least one of the second turbidity sensor and the second settling measurement sensor is within the reference value range Eool first flocculant and second flocculant dosage amount is decreased to be the first flocculating agent supply unit and the second auto-coagulant, characterized in that for controlling the operation of the coagulant supply control system until.

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