KR101301598B1 - Coagulant input rate real time optimal method and polluted sewage treatment facilities therefor - Google Patents

Abstract

PURPOSE: An optimal method of coagulant input rate in real time is provided to minimize coagulant usage because the coagulant input rate is determined based on the phosphorus removal performance of a coagulant having a specific phosphorus removal amount per 1 ppm in waste water. CONSTITUTION: An optimal method of coagulant input rate in real time comprises the steps of: (a) setting the target phosphorus concentration (ET) of discharged water; (b) producing a first sample by filling waste water in a filtration bath; (c) filtering suspended solids of the first sample in the filtrate bath and filling the waste water in a jar bath to produce a second sample; (d) measuring the waste water phosphorus concentration (P3) of the first sample having no suspended solids; (e) emptying the filtration bath; (f) inserting a coagulant with determined coagulant input quantity (JDQO) into the jar bath to mix with the coagulant having the second sample and stir the mixture; (g) dropping the second sample having the coagulant in the jar bath on the filtration bath; (h) measuring the coagulant sample phosphorus concentration (JP) after filtering suspended solids in the second sample with the coagulant in the filtration bath; (i) repeating from the (b) step to (h) step after emptying the filtration bath and the jar bath; (j) calculating the coagulant real efficiency (CD) in comparison with the coagulant input rate (JDR) by finding the difference between the coagulant sample phosphorus concentration (JP) and the waste water phosphorus concentration (P3); (k) calculating the practical coagulant input rate (CIR) necessary for the target phosphorus concentration (ET) based on the coagulant real efficiency (CD); and (l) injecting the coagulant according to the inflow of the waste water, from which phosphorus concentration has to be removed, based on the above-mentioned practical coagulant input rate (CIR). [Reference numerals] (AA) End; (S10) MPCS operating; (S100,S300) Implementing measurement of phosphorus concentration; (S110,S310) Injecting sample of a filter water tank; (S120,S320) Filtering sample; (S130,S330) Measuring phosphorus concentration (P3) of the sample; (S140,S340,S700) Back-washing and drainage; (S150,350) Changing into waiting mode; (S20) Setting discharge target of phosphorus concentration (ET); (S200) Implementing test mode of phosphorus concentration; (S210) Injecting sample of a jar bath; (S220) Calculating the used amount of coagulant (JDR) (JDR=(PT-ET)/CD); (S230) Calculating the used amount of coagulant (JDQO) (JDQO=(JDR×JSQ)/10,000); (S240) Adding coagulant and stirring; (S30) Measuring coagulant performance?; (S40,S50) Running sampling pump; (S400) Discharging the produced coagulant sample?; (S410) Changing into an inflow mode of coagulant sample; (S420) Connecting the jar bath and the filter water tank; (S430) Inflowing coagulant sample of the filter water tank and filtering; (S440) Measuring phosphorus concentration (P3) of the coagulant sample; (S450) Measuring phosphorus removal amount of the coagulant (JCD=(P3-JP)/JDR); (S460) Deciding real removal efficiency of phosphorus of the coagulant (CD=JCD); (S470) Measuring the amount of injected coagulant (CIR, Cpagulant Input Rate)(CIR=(ET)/CD); (S480) Measuring the amount of injected coagulant (CIQ, Coagulant Input Quantity)(CIQ=(swage inflow amount×cir/60); (S490) Measuring the injection speed of coagulant (CIS, Coagulant Input Speed)(CIS= CIQ/ coagulant specific gravity); (S500) Offering data to MPCS; (S600) Satisfying test period and repeating?

Description

Coagulant Input Rate Real Time Optimal Method and Polluted Sewage Treatment Facilities therefor}

The present invention relates to the input of flocculant for the removal of phosphorus in sewage, in particular the amount of coagulant input to remove the dissolved phosphorus occupies more than 80% of the total phosphorus concentration in the waste water in real time phosphorus of the treated water (wastewater) The present invention relates to a method for optimizing the concentration of flocculant input based on concentration, and a sewage treatment plant using the same.

In general, phosphate in wastewater, such as sewage and wastewater, contributes to phytoplankton propagation along with nitrogen, which promotes eutrophication of worsening water quality.

Therefore, in sewage treatment plants, biological treatment of wastewater is carried out to detect phosphorus concentrations, and based on this, coagulants such as polyaluminum chloride (PAC) are administered to change to purified sewage with extremely low phosphorus concentrations and discharged. Done.

In general, wastewater contains phosphorus together with suspended solids, and phosphorus in wastewater is classified into organic phosphorus and inorganic phosphorus having dissolved phosphorus and particulate phosphorus, respectively. It occupies more than 80%.

However, coagulant that removes dissolved phosphorus reacts with suspended solids as well as dissolved solids, so the coagulant added based on the dissolved phosphorus concentration has a low ratio of dissolved phosphorus to the input. none.

Due to this, the amount of coagulant actually added consumes a relatively large amount compared to the appropriate amount based on the dissolved phosphorus concentration, which lowers the efficiency of the coagulant and in particular the excessive amount of coagulant. This increases the cost of use.

Japanese Patent Publication No. 1999-169885

The said patent document compares the phosphorus concentration of the to-be-processed water, the phosphorus concentration in a treated water, and the phosphorus concentration target value, and shows the example of the technique which determines the flocculant input concentration and the input amount by this comparison.

However, the patent document has a time interval between the detection time of the phosphorus concentration in the wastewater and the input of coagulant based on the same, and in particular, as a characteristic of the coagulant reacting with the suspended solids contained in the wastewater. Therefore, the removal of suspended solids prior to the detection of phosphorus concentration is preceded first, so that the time for measuring the concentration of phosphorus is longer.

Due to this, although the input of coagulant can be reduced, the input does not correspond to the phosphorus concentration of waste water to be treated, and in particular, it is impossible to cope with the input of coagulant to the phosphorus concentration that changes in real time. The risk of discharged with phosphorus concentrations is also very high.

Thus, the present invention in view of the above point, if the target phosphorus concentration (ET) of the effluent is set, by measuring the suspended solids (Suspended Solids) from the wastewater to measure the wastewater phosphorus concentration (P3), the flocculant for phosphorus removal It is added to another sample sample of the waste water to measure the coagulant sample phosphorus concentration (JP), and from the waste water phosphorus concentration (P3) and the coagulant sample phosphorus concentration (JP), the actual phosphorus removal per ppm of the coagulant is calculated. The purpose of the present invention is to provide a coagulant input rate real-time optimization method and a sewage treatment facility using the coagulant input rate, which can minimize the amount of coagulant by determining the input rate and the input amount of the coagulant according to the inflow of waste water.

The real-time optimization method of the flocculant input rate of the present invention to achieve the above object is the concentration of wastewater phosphorus by filtering suspended solids from one sample sample drawn from wastewater when the target phosphorus concentration (ET) of the effluent is set. (P3), a coagulant input amount (JDQO) is determined from the coagulant input rate (JDR) for phosphorus removal calculated based on the phosphorus concentration trend of the wastewater, and the coagulant input amount (JDQO) is extracted from the waste water. A flocculant seal efficiency measurement step which is input to one sample sample and converted into a flocculant sample;

A coagulant yarn efficiency calculation step of calculating a difference between the coagulant sample phosphorus concentration (JP) measured in the coagulant sample and the wastewater phosphorus concentration (P3) and calculating a coagulant seal efficiency (CD) relative to the coagulant injection rate (JDR);

A coagulant yarn input rate calculation step of calculating an actual coagulant input rate (CIR) for the target phosphorus concentration (ET) based on the coagulant yarn efficiency (CD);

A coagulant input step in which the coagulant is added according to the inflow amount of the waste water based on the actual coagulant input rate (CIR); It characterized in that the execution is included.

In the step of measuring the flocculant actual efficiency, the setting of the target phosphorus concentration (ET) is performed by the operator, and the coagulant injection rate (JDR) is [(Sewage phosphorus concentration prediction value PT after a predetermined time-target phosphorus concentration (ET). )) / Removed amount per 1 ppm of coagulant injected (CD)], and the coagulant input amount (JDQO) is calculated by the relationship formula [coagulant input rate (JDR) x coagulant sample amount (JSQ)]. Diluted with.

In the coagulant yarn efficiency calculation step, the coagulant yarn efficiency (CD) is calculated as a relational formula of ((coagulant sample phosphorus concentration (JP)-wastewater phosphorus concentration (P3)) / coagulant input rate (JDR)).

In the flocculant loading rate calculation step, the actual flocculant loading rate (CIR) is calculated by the relational expression of [target phosphorus concentration (ET) / flocculant yarn efficiency (CD)].

In the coagulant input step, the coagulant input amount (CIQ) is calculated by the relationship of ((actual coagulant input rate (CIR) x wastewater input) / min), and the coagulant input rate (CIS) is [coagulant input amount (CIQ) / After the coagulant specific gravity is calculated, the coagulant input is performed.

After the coagulant input step, the completion of the test cycle of the washing water to clean the filtration tank containing the one sample sample and the cutting tank containing the other sample sample; Is further executed.

In addition, the sewage treatment facility of the present invention for achieving the above object is a phosphorus concentration meter having a filtration tank for extracting and storing a sample sample for measuring the phosphorus concentration of phosphate meter from the supplied waste water; A coagulant evaluator for extracting and storing another sample sample from the waste water, and having a cutting tank into which a coagulant for removing phosphorus is introduced, and discharging the coagulant sample mixed with the coagulant and the other sample sample to the filter water tank;

A flocculant injector for diluting to a concentration of a flocculant introduced into the flocculant evaluator; An agitator for stirring the flocculant and the other sample sample to make the flocculant sample; A pipe line connected to supply and discharge the waste water pumped from the waste water purification tank to the filtrate tank and the cutting tank, and to supply the washing water to the filtrate tank and the cutting tank; Characterized in that it comprises a sample preparation unit equipped with.

The pipe line includes a filtration tank line in which a sampling pump is installed to supply wastewater to the filtration tank; A cutting test valve is installed, and the cutting tank line is connected to the cutting tank in the filtered water tank line; A second overflow line connected to a first overflow line for discharging the overflowed waste water from the filtration tank and discharging the overflowed waste water from the cut tank; A first washing water line installed with a washing water valve and connected to the filtration tank to supply washing water; A second washing water line having a washing water valve installed therein and connected to the cutting tank to supply washing water; A phosphorus concentration detection line having an end portion of the phosphate meter connected to the filtration tank; First and second drain lines respectively provided with drain valves and provided in a state separated from the filtration tank; A third drain line provided with a drain valve and extending from the cutting tank to the filtration reservoir; .

The sample pretreatment unit is controlled by MPCS (300, Monitoring and Proportional Control System) so that the measurement of the phosphorus concentration of the waste water and the measurement of phosphorus removal efficiency per ppm of the flocculant are repeatedly performed at a predetermined cycle of one cycle. Become; The MPCS receives the PH concentration measurement data along with the water temperature of the wastewater collected in the primary sedimentation basin, and injects flocculant into the secondary sedimentation basin connected to the bioreactor connected to the primary sedimentation basin.

In the present invention, the coagulant having a theoretical phosphorus removal performance per ppm is determined based on the phosphorus removal performance that can be substantially exerted in the waste water, and the coagulant input rate is determined, thereby minimizing the use of the coagulant. Regardless of which optimum coagulant efficiency can always be exerted.

In addition, the present invention is the amount of phosphorus removal per 1 ppm of coagulant from the waste water is calculated in real time as the actual application value, so the flocculant input rate correction is corrected for the waste water where the suspended solids concentration, pH, sewage properties, etc. are changed at every time. It can be performed automatically in real time.

In addition, the present invention can be stabilized TP (expected phosphorus concentration) of effluent removed by coagulant by applying a coagulant input rate of high dissolved soluble phosphorus accounting for 80% of the total phosphorus concentration of waste water, In particular, the effluent may be released with an expected concentration of phosphorus (TP) suitable for the discharge criteria.

In addition, the present invention accurately detects the phosphorus concentration used in the coagulant input rate of the coagulant in real time from the sample sample completely removed from the influence of the suspended solids, thereby detecting the phosphorus concentration in the wastewater and There will be no time lag between the flocculant inputs.

In addition, the present invention is a wastewater sample operation for calculating the flocculant input rate and a wastewater sample operation for measuring the phosphorus concentration to completely remove the influence of the suspended solids (Batch Process) or a time interval batch process (Batch Process) In this case, the phosphorus concentration measurement time can be made faster if necessary.

In addition, the present invention is a waste water sample operation for the calculation of the coagulant input rate and a waste water sample operation and a flocculant input operation for measuring the phosphorus concentration to completely remove the influence of suspended solids (Monitoring and Proportional) By fully automatic control by the control system, the operating efficiency of the sewage treatment plant using the same can be greatly improved.

1 is an operation flowchart of a flocculant input rate real-time optimization method according to the present invention, Figure 2 is a block diagram of a sample pretreatment unit operating under the control of the Monitoring and Proportional Control System (MPCS) according to the present invention, Figure 3 Figure 4 is a control example of the phosphorus concentration measurement mode according to the invention, Figure 4 is a control example of the coagulant performance efficiency measurement mode according to the present invention, Figure 5 is the actual performance efficiency (JP) and theoretical performance of the used flocculant obtained according to the present invention Figure 6 is an example showing the difference of the efficiency (CD), Figure 6 is an operating state to complete the one-time mode by the drainage under the control of the MPCS according to the present invention, Figure 7 is operated by the real-time optimization method of the flocculant input rate according to the present invention It is the configuration of sewage treatment facilities.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

1 shows the operational flow of the flocculant input rate real-time optimization method according to the present embodiment.

S10 is a Monitoring and Proportional Control System (MPCS) operation step. When the MPCS operation is performed, the operator sets a concentration ET, which is a effluent target for the effluent discharged through the sewage treatment facility, as in S20. In general, the effluent target concentration (ET) setting can be set by the operator or automatically in the MPCS without the operator's setting by fixing the target value if necessary. Here, setting the concentration ET of the effluent target is defined as (a) setting the target concentration ET of the effluent.

S30 is a step of selecting whether to measure the coagulant performance efficiency, through which the actual phosphorus removal performance of the coagulant injected in the phosphorus removal can be determined. The actual phosphorus removal performance of these flocculants needs to be judged because the intrinsic phosphorus removal performance (amount of phosphorus removed per ppm) of the flocculant is measured in a wastewater state where phosphorus concentration is constant, so that the performance of wastewater changes at a time. This is due to the change in efficiency.

In particular, if it is selected whether to measure the flocculant performance efficiency in S30, the sewage treatment capacity per hour can be greatly improved by operating the sewage treatment facility more quickly.

S40 and S50 are the stages in which the sampling pumps are respectively operated to extract the wastewater sample from the wastewater. The sampling pump is controlled in the MPCS, whereby a wastewater sample for accurate phosphorus concentration determination is obtained from the wastewater to be treated.

S100 is a step in which the phosphorus concentration measurement mode is executed, S200 is a step in which the coagulant test mode is executed, and S300 is a step in which the phosphorus concentration measurement mode is executed together with the coagulant test mode of S200.

In this embodiment, the phosphorus concentration measurement mode of S100 and the phosphorus concentration measurement mode of S300 are performed in the same process.

2 shows the structure of the sample preparation unit 100 in which phosphorus concentration measurement and flocculant test are performed.

As illustrated, the sample pretreatment unit 100 includes a phosphorus concentration meter 1 for extracting and storing a sample sample from the supplied waste water, and a coagulant evaluator for extracting and storing another sample sample from the supplied waste water. ), The coagulant injector 60 which dilutes the coagulant introduced into the coagulant evaluator (1-1) to about 1/100 concentration, and the coagulant added to the coagulant evaluator (1-1) with the sample sample to stir the coagulant sample. A stirrer 60-1, which is introduced into the furnace, and a phosphate meter 70 for measuring phosphorus concentration from the wastewater sample sample contained in the phosphorus concentration meter 1.

The phosphorus concentration meter 1 includes a filtration tank 2 for extracting a sample sample from the supplied waste water, and the filtration tank 2 is divided into left and right spaces by a filtration membrane, so that After the sample passes through the filter membrane, all suspended solids contained in the sample can be converted into the filtered phosphorus concentration measurement sample, and the phosphorus concentration measurement sample is collected into the space opposite to the membrane.

In particular, the space on the opposite side of the filtration membrane where the phosphorus concentration measurement sample is collected is formed at a height relatively lower than the height of the filtration tank 2 with respect to the ground, so that the formation time of the sample flow rate required for the phosphorus concentration measurement is relatively shortened. Can be.

In addition, the membrane is a membrane type (Membrane) type that can be lowered to less than about 10ppm concentration of suspended solids (Suspended Solids) is applied, but can also be applied to the (Woven Wire Screens) type having the same effect.

On the other hand, the flocculant evaluator 1-1 includes a cutting tank 2-1 for extracting and storing another sample sample from the supplied waste water, and the cutting tank 2-1 includes a waste water sample at a predetermined height. It consists of a jar or bottle that can be filled.

On the other hand, the sample pre-treatment unit 100 is further provided with a pipe line for supplying and discharging the waste water sample sample, the pipe line is configured with the waste water purification tank 200.

In detail, the pipe line includes a wastewater supply line, an overflow line, a wash water line, a phosphorus concentration detection line leading to the phosphate meter 70, a drain line, and a flocculant in which the flocculant diluted in the flocculant injector 60 flows. It consists of an input line 61.

The waste water supply line is connected to the filtration water tank line (10) and the filtration water tank line (10) to extract waste water from the waste water purification tank (200) and to supply waste water to the filtration water tank (2) of the phosphorus concentration meter (1). It consists of a cut tank line 10-1 which supplies wastewater to the cut tank 2-1 of 1-1).

Usually, a sampling pump 11 is installed in the filtration tank line 10, and a cutting test valve 10-1a is installed in the cutting tank line 10-1, and the sampling pump 11 and the cutting test are installed. The valve 10-1a is controlled by the MPCS 300.

The overflow line is a first overflow line 20 for discharging the waste water overflowed from the filtration tank (2) of the phosphorus concentration meter (1), and a cut tank (2-1) of the flocculant evaluator (1-1) It consists of a second overflow line 20-1 for discharging the overflowed waste water.

Typically, the second overflow line 20-1 is connected to the first overflow line 20.

The washing water line is connected to the filtration tank (2) of the phosphorus concentration meter (1), the washing water is sprayed to the washing water nozzle (30b) and supplied to the first washing water line 30, and the cutting tank of the coagulant evaluator (1-1) It consists of the 2nd wash water line 30-1 which continues to (2-1), and is supplied with wash water.

Wash water valves 30a and 30-1a are respectively installed in the first wash water line 30 and the second wash water line 30-1, and each of the wash water valves 30a and 30-1a is MPCS 300. Is controlled.

The phosphorus concentration detection line 40 leads to a filtration tank 2 filled with a phosphorus concentration measurement sample in which the end portion of the phosphate meter 70 passes through the filtration membrane and the concentration of suspended solids is lowered to about 10 ppm or less. .

The drain line includes a first drain line 51, a second drain line 53, and a third drain line 55, and the first drain line 51 and the second drain line 53 are in Out of the filtration tank (2) of the concentration meter (1), respectively, leading to the waste water purification tank (200), and the third drain line (55) comes out of the cut tank (2-1) of the flocculant evaluator (1-1) It leads to the filtration reservoir 2 of the concentration meter 1.

Drain valves 51a, 53a, and 55a are respectively installed in the first drain line 51, the second drain line 53, and the third drain line 55, and the respective drain valves 51a and 53a are provided. 55a is controlled by the MPCS 300.

In particular, the first drain line 51 is provided with a sample portion filled space of waste water in the filtration tank 2 divided into left and right spaces by the filtration membrane, while the second drain line 53 passes through the filtration membrane. It is provided with a space filled with a phosphorus concentration measurement sample whose concentration of suspended solids is lowered to about 10 ppm or less.

The coagulant input line 61 exits the coagulant injector 60 and leads to the cutting tank 2-1 of the coagulant evaluator 1-1.

Referring to Figure 1, S100 is a step in which the phosphorus concentration measurement mode is executed, which is performed in the process of S110 to S150.

In S110, the sample sample is secured by the waste water supplied by the operation of the sampling pump in the filtered water tank. In S120, the sample is filtered to filter the suspended solids, and in S130, the concentration of the suspended solids is increased. Phosphorus concentration is measured from the filtered sample lowered below about 10 ppm. At this time, the measured phosphorus concentration is defined as P3, and provided in MPCS as S500. Here, the sample sample of the filtrate tank is defined as the first sample. The step S110 is defined as (b) filling the waste water into the filtered water tank to make a first sample, and the step S120 includes (c) suspending suspended solids contained in the first sample from the filtered water tank. , And defining a second sample by filling the waste water into the cutting tank, and the step S130 is defined as (d) measuring the wastewater phosphorus concentration (P3) of the first sample from which the suspended solids are filtered. do.

In S140, after the phosphorus concentration (P3) is measured, it is backwashed and washed with rinsing water to empty the filtered water tank, and when all of these operations are completed, the process is switched to the standby state for the next test as in S150. Here, the step of S140 is defined as (e) emptying the filtered water tank.

This phosphorus concentration measurement mode is illustrated through FIG. 3.

Referring to FIG. 3 (a), the sampling sample inflow of S110 is performed to fill the filtrate water tank 1 with one space separated by the filtration membrane, and the sampling sample filtration of S120 is performed by the filtration membrane. The concentration of suspended solids is converted to a measurement sample (Kb) lowered to about 10 ppm or less, and the measurement sample (Kb) is corrected through a phosphate meter (70) connected to the phosphorus concentration detection line (40). ) Is measured.

Subsequently, the back washing water and the drainage of S140 are performed to wash the filtrate tank 1 with the washing water sprayed through the nozzle 30b of the washing water line 30, and the washing water of the filtrating tank 1 is the first drain line 51. ) And is discharged to the outside through the second drain line 53.

3 (b) is a control example performed by the MPCS 300 in the phosphorus concentration measurement mode of S100, while the sampling pump 11 is switched off when performing two-stage filtration, while the washing water line 30 The valve 30a, the drain valve 51a of the first drain line 51, and the drain valve 53a of the second drain line 53 are both in an off state and maintain a close state.

In addition, the sampling wait and backwashing and draining are respectively controlled accordingly.

Referring to Figure 1, S300 to S350 is a phosphorus concentration measurement mode, which is the same as the phosphorus concentration measurement mode performed in S100 to S150.

On the other hand, S200 is a step in which a coagulant test mode is executed, which may be classified into a pretreatment process based on the cohesive agent intrinsic performance efficiency of S210 to S240 and a post treatment process in which the intrinsic performance efficiency of the coagulant of S400 to S490 is re-evaluated. .

The pretreatment process performed by S210 to S240 is performed as follows.

In S210, a sample sample is introduced into the water tank, and in S220, a calculated flocculant input rate calculation (JDR = (PT-ET) / CD) is obtained. In S230, a calculated flocculant input amount is calculated based on JDR ((JDQO = (JDR x JSQ) / 10,000) is obtained, and in S240, a coagulant is added based on the JDQO and mixed with the sample sample contained in the water tank to generate a coagulant sample, wherein the sample water sample of the water tank is defined as the second sample. The coagulant sample is defined as a second sample mixed with the coagulant Steps S220, S230, and S240 are calculated by (f) the coagulant input rate (JDR) of the coagulant for removing phosphorus according to the value of the wastewater phosphorus concentration (P3). The coagulant input amount (JDQO) determined by the coagulant input rate (JDR) is calculated, and the coagulant determined by the coagulant input amount (JDQO) is administered to the cutting tank to stir to mix the second sample with the coagulant administered. Defined as steps.

Where JDR is the used flocculant input rate, PT is the sewage phosphorus concentration prediction value (ppm) after 15 minutes, ET is the effluent target phosphorus concentration (ppm), CD is the removal amount per ppm of flocculant, and JDQO is the input flocculant input , JSQ is the sample volume (ml) of the flocculant used for the Jar test.

This pretreatment process is illustrated through FIG. 4, and referring to the flocculant evaluator 1-1 of FIG. 4, the sample test flow into the cutting tank of S210 is performed to turn on the cutting test valve 10-1a. The filtered water tank line 10 and the cut water tank line 10-1 communicate with each other, and the waste water pumped by the sampling pump 11 is filled in the cut water tank 2-1 through the cut water tank line 10-1. do.

Since the JDR of S220 and the JDQO of S240 are calculated in the MPCS 300, the coagulant injector 60 dilutes the used coagulant input amount based on JDQO to about 1/100, and the coagulant input line diluted to about 1/100 is used. 60) is fed into the cutting tank (2-1).

As the stirring of S240 is performed, the MPCS 300 operates the stirrer 60-1 to mix the sample of waste water and the added coagulant to form a coagulant sample. At this time, the coagulant sample is in a state in which phosphorus is removed as a used coagulant added from a sample sample of waste water.

Referring to FIG. 1, the post-treatment process performed in S400 to S490 is performed as follows.

When the MPCS determines the discharge of the coagulant sample into the filtration tank as in S400, the standby state of S350 is switched to the inflow state of S410 as in S410, and the cutting tank and the filtration tank are connected to each other as in S420. A coagulant sample inflow and filtration are performed in the filtrate tank, and in S440, a coagulant sample phosphorus concentration (JP) is measured. Here, steps S410 and S420 are defined as (g) dropping a second sample mixed with the coagulant of the cutting tank into the filtered water tank, and steps S430 and S440 are (h) suspended solids contained in the second sample mixed with the coagulant. Suspended Solids is defined as a step of measuring the concentration of the coagulant sample (JP) by filtering the filtrate.

Such a post-treatment process is illustrated in FIG. 4, and referring to the phosphorus concentration meter 1 of FIG. 4, the drain valve 55a is opened by switching to the cutting tank and the filtration tank connected to each other as shown in S420. The third drain line 55 connected to 2-1) is opened to the filtration tank 2, and the coagulant sample Ka-1 is filled into one space separated by the filtration membrane provided in the filtration tank 2, The coagulant measurement sample (Kb-1) is collected in the opposite space through the filtration membrane.

When the phosphorus concentration (JP) is measured as in S440, the phosphate meter 70 enters the flocculant measurement sample Kb-1 through the phosphorus concentration detection line 40 and then corrects the phosphorus of the measurement sample Kb-1. The concentration is measured, and in S450, the phosphorus removal amount of the used flocculant is accurately calculated based on the measured phosphorus concentration.

In this case, the measured phosphorus concentration defined in JP refers to the measured phosphorus concentration (ppm) after the Jar test. In addition, the phosphorus removal amount of the used flocculant is defined as JCD, and is computed from the relationship of JCD = (P3-JP) / JDR.

5 is an example showing the difference between the actual performance efficiency (JP) and the theoretical performance efficiency (CD) of the coagulant used, the phosphorus concentration of the A block waste water is about 1.5 ppm, and the amount of coagulant to be used together with the B block. This is about 50 ppm, and stirred and precipitated as C block to make a coagulant sample, and when the phosphorus concentration is measured to about 0.3 ppm from the coagulant sample as D block, the amount of phosphorus removed per ppm of coagulant injected as E block (1.5 It is calculated by the relation of -0.3) / 50 to obtain about 0.024, and it can be seen that this value of 0.024 is the actual phosphorus removal performance efficiency of the coagulant used.

This relation means JCD = (P3-JP) / JDR applied to S450,

Referring to Fig. 1, the amount of used flocculant to be actually added is calculated by sequentially executing S460 to S490.

In S460 JCD is defined as CD, which means the actual amount of phosphorus removal per ppm by the flocculant used. Therefore, CD defined from JCD means a different value from CD without flocculant performance efficiency measurement. The step S460 is defined as the step of calculating the difference between the coagulant sample phosphorus concentration (JP) and the wastewater phosphorus concentration (P3) to calculate the coagulant actual efficiency (CD) relative to the coagulant injection rate (JDR).

In S470, a coagulant input rate is accurately recalculated from the actual phosphorus removal amount (CD = JCD) of the used coagulant, and the coagulant input rate is defined as a Coagulant Input Rate (CIR), and is calculated by the relationship of CIR = ET / CD. Where ET is the effluent target concentration and CD is the actual phosphorus removal (CD = JCD) of the flocculant used. In this case, step S470 is defined as (k) calculating the actual flocculant loading rate (CIR) required at the target phosphorus concentration (ET) based on the flocculant seal efficiency (CD).

In S480, a coagulant input amount suitable for sewage inflow is calculated again based on the CIR, and the coagulant input amount is defined as CIQ (Coagulant Input Quantity), and is calculated by CIQ = (sewage inflow x CIR) / 60. Here, the sewage inflow is Ton / Hour.

In S490, a flocculant input speed is calculated based on CIQ, and the flocculant input speed is defined as a coagulant input speed (CIS) and calculated as a relational expression of CIS = CIR / coagulant specific gravity. Here, steps S480 and S490 are defined as (l) a coagulant input step in which the coagulant is added according to the inflow amount of waste water to be removed phosphorus concentration based on the actual coagulant input rate (CIR).

On the other hand, the S500 is a step in which the control value of the MPCS is changed according to the MPCS is provided with new data, through which the MPCS is in real time in accordance with the suspended solids concentration, ph, sewage phase in the waste water which is treated water. It can respond.

S600 is a step of checking whether the test cycle is satisfied and whether or not to perform the repetition. In this embodiment, the overall time required for the test cycle may be determined, and in particular, the repetition of the test may be selected.

S700 is a step in which backwashing and draining are preceded first when the repetition is performed, and thus the influence of the previous test may be completely eliminated when a new test is performed.

Such backwashing and draining is illustrated through FIG. 6, as shown in FIG. 6, the backwashing operation is carried out together in the phosphorus concentration meter 1 and the flocculant evaluator 1-1.

When the washing water is supplied by opening the washing water valve 30a of the first washing water line 30 and the washing water valve 30-1a of the second washing water line 30-1 in the MPCS 300, the first washing water line 30 The filtration tank 2 is cleaned with the washing water sprayed through the washing water nozzle 30b of FIG. 6), and the cutting tank 2-1 is cleaned with the washing water sprayed through the second washing water line 30-1.

Then, the washing water of the cut tank 2-1 is sent to the filtration tank 2 by opening the drain valve 55a of the third drain line 55 connected to the cut tank 2-1 in the MPCS 300. Through this, the cutting tank (2-1) is completed backwashing and draining.

Thereafter, the MPCS 300 opens the drain valve 51a of the first drain line 51 and the drain valve 53a of the second drain line 53 connected to the filtration tank 2 of the filtration tank 2. Backwashing and drainage are also completed in the filtered water tank 2 by discharging the washing water.

In this drainage state, the sampling pump 11 remains off and the drain valves 51a, 53a, 55a remain open, while the wash water valves 30a, 30-1a are off. Off) to the Closed state.

On the other hand, Figure 7 shows an example of the configuration of the sewage treatment plant operated by the flocculant input rate real-time optimization method according to the present embodiment.

As shown, the sewage treatment facility puts microorganisms into the primary sedimentation basin (200-1) for precipitating and purifying the wastewater introduced together with the suspended solids, and the wastewater purified for the first time by sedimentation. A wastewater purification tank 200 having a biological reaction tank 200-2 causing sewage decomposition; A measuring device 400 having a flow meter 410 for measuring the flow rate of waste water, and a PH meter 420 for measuring the pH concentration together with the water temperature of the waste water collected in the primary sedimentation basin 200-1; A secondary sedimentation basin 500 for repurifying the first purified wastewater through a wastewater purification tank 200; A sludge collector 700 for filtering sludge before being discharged from the secondary settler 500 from which phosphorus is removed is included.

In addition, the sewage treatment facility further includes a sample pretreatment unit 100 and an MPCS (300, Monitering & Proportional Control System) serving as a top-level controller.

The sample pretreatment unit 100 checks the exact performance of the flocculant to be added to the waste water to be treated, and at the same time, the phosphorus concentration is accurately measured in real time without removing the suspended solids, thereby obtaining an accurate flocculant input amount.

The MPCS 300 is provided with all the data detected and measured for the wastewater treatment, and configures a circuit with the sample pretreatment unit 100 so that a test mode performed in the sample pretreatment unit 100 is defined by one cycle. Can be run repeatedly in periods.

In particular, the MPCS 300 can automatically discharge the phosphorus removal process performed in the sewage treatment facility so that the discharge target phosphate concentration (T-P) of the treated wastewater can be discharged in a state suitable for the reference value without the operator's intervention.

As described above, in the real-time optimization method of the flocculant input rate according to the present embodiment, when the target phosphorus concentration (ET) of the effluent is set, the wastewater phosphorus concentration (P3) is measured by filtering suspended solids from the wastewater. A flocculant for removal is introduced into another sample of the wastewater to measure the coagulant sample phosphorus concentration (JP), and the actual amount of phosphorus removal per ppm of the coagulant is measured from the wastewater phosphorus concentration (P3) and the coagulant sample phosphorus concentration (JP). After the calculation, the input rate and input amount of the flocculant are determined based on the inflow of wastewater, and thus the amount of flocculant used can be minimized. It can be released constantly.

1: Phosphorus concentration measuring instrument 1-1: Coagulant evaluator
2: Filtration tank 2-1: Jar tank
10: filtered water tank line 10-1: cut water tank line
10-1a: Zartest valve 11: Sampling pump
20: first overflow line 20-1: second overflow line
30: the first washing water line 30-1: the second washing water line
30a, 30-1a: Washing water valve 30b: Washing water nozzle
40: phosphorus concentration detection line 51: first drain line
51a, 53a, 55a: drain valve 53: second drain line
55: third drain line
60: coagulant injector 61: coagulant input line
60-1: Stirrer
70: phosphate meter 100: sample preparation unit
200: wastewater purification tank 200A: recovery tank
200-1: primary settler 200-2: biological reactor
300: MPCS (Monitering & Proportional Control System)
400: measuring instrument 410: flow meter
420: PH measuring instrument 500: secondary sedimentation basin
600: flocculant injector 700: sludge collector

Claims (10)

(a) setting a concentration ET which is a target of the effluent;
(b) filling the waste water in the filtered water tank to make a first sample;
(c) filtering suspended solids contained in the first sample from the filtered water tank, and filling the waste water into the cutting water tank to make a second sample;
(d) measuring the wastewater phosphorus concentration (P3) of the first sample in which the suspended solids are filtered;
(e) emptying the filtrate tank;
(f) The coagulant input rate (JDR) of the coagulant for removing phosphorus is calculated according to the value of the wastewater phosphorus concentration (P3), the coagulant input amount (JDQO) determined as the coagulant input rate (JDR) is calculated, and the coagulant input amount Administering a flocculant determined by (JDQO) to the jar tank and stirring the second sample to mix with the administered flocculant;
(g) dropping a second sample mixed with the flocculant of the cutting tank into the filtered water tank;
(h) filtering the suspended solids (Suspended Solids) contained in the second sample mixed with the flocculant in the filtrate to measure the concentration of the flocculant sample (JP);
(i) emptying the filtered water tank and the cut water tank, and then repeating steps (b) to (h);
(j) calculating the difference between the flocculant sample phosphorus concentration (JP) and the wastewater phosphorus concentration (P3) to calculate the flocculant actual efficiency (CD) relative to the flocculant injection rate (JDR);
(k) calculating the actual flocculant loading rate (CIR) required at the target phosphorus concentration (ET) based on the flocculant yarn efficiency (CD);
(l) a coagulant injecting step in which the coagulant is added according to the inflow amount of waste water to which phosphorus concentration is to be removed based on the actual coagulant input rate (CIR); Real-time optimization method of the flocculant input rate, characterized in that the execution is included.
The method according to claim 1, wherein the setting of the target phosphorus concentration (ET) is performed by the operator, the flocculant injection rate (JDR) is ((Sewage phosphorus concentration predicted value (PT)-target phosphorus concentration (ET) after a predetermined time) / The amount of the flocculant added per 1 ppm (CD)] is calculated, and the amount of the flocculant (JDQO) is calculated by the relationship of [coagulant dose rate (JDR) x coagulant sample amount (JSQ)] and then diluted at a predetermined ratio. Real-time optimization method of the flocculant input rate, characterized in that.
The flocculant loading rate of claim 1, wherein the flocculant actual efficiency (CD) is calculated by a relation formula of [(coagulant sample phosphorus concentration (JP)-wastewater phosphorus concentration (P3)) / coagulant injection rate (JDR)]. Real time optimization method.
The method of claim 3, wherein the flocculant seal efficiency (CD) is a phosphorus removal amount per ppm of the flocculant.
The method of claim 1, wherein the actual flocculant loading rate (CIR) is calculated by a relational expression of [target phosphorus concentration (ET) / coagulant actual efficiency (CD)].
The method according to claim 1, wherein the flocculant input amount (CIQ) is calculated by the relation of ((actual flocculant input rate (CIR) x wastewater input) / min), the coagulant input rate (CIS) is [coagulant input amount (CIQ) / Flocculant specific gravity], and then the flocculant input rate is a real-time optimization method characterized in that the addition of the flocculant.
delete It is equipped with a sample pretreatment unit controlled by MPCS (Monitoring and Proportional Control System) so that the measurement of phosphorus concentration in waste water and the measurement of phosphorus removal efficiency per ppm of flocculant are repeatedly performed at a predetermined cycle of one cycle. In sewage treatment equipment,
The sample pretreatment unit includes: a filtration water tank line having a sampling pump and connected to a waste water purification tank;
Some waste water of the waste water pumped by the sampling pump is connected to the filtration tank line extended to be out of the position of exiting the filtration tank for phosphorus concentration measurement from the filtration tank line, and the remaining waste water which does not escape to the filtration tank is introduced with a coagulant. A cut tank line which exits to a dragon cut tank;
And a piping line connecting the cutting tank and the filtration tank to a flow passage.
The pipe line may include: a second overflow line extending from the cut tank and connected to the first overflow line such that the waste water overflowed from the cut tank is discharged through the first overflow line for discharged waste water from the filtered tank; The sewage treatment facility comprising a third drain line connected to the filtration tank at the bottom of the cutting tank so that the wastewater contained in the tank and the coagulant are mixed and discharged to the filtration tank.
The waste water tank of claim 8, wherein a jar test valve is installed at the jar tank line, a drain valve is installed at the third drain line, and the coagulant supplied by diluting the flocculant concentration in a flocculant injector is diluted in the jar tank. Sewage treatment facility characterized in that it further comprises a second washing water line for washing water supply having a washing water valve with a stirrer to mix with. delete

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