KR101197392B1 - The phosphorus removal system regarding the automatic determination of coagulant dosing rate using artificial intelligence - Google Patents

Abstract

The present invention relates to a method for removing phosphorus, which is one of the nutrients that cause eutrophication in rivers, lakes, water and the like, from sewage effluent.
If the concentration of phosphorus in sewage effluent can be measured in real time and the value can be immediately known, the coagulation tank chemical injection volume can be directly adjusted to obtain the optimum treatment water quality with the optimal chemical injection. Is approximately 1 hour, PO4-P can be known after 30 minutes, so the sampling and measurement should be done before analysis time to know the concentration of TP or PO4-P at the arrival of the coagulation tank. As the amount of sludge and surplus sludge discharge changes, the arrival time of the flocculation tank changes, so it is very difficult to determine the optimum amount of chemical injection in real time.
In order to treat phosphorus by the present invention, the inflow flow rate, flocculation tank inflow concentration, aeration tank return sludge and excess sludge discharge amount are pre-measured to determine the injection amount of the coagulation tank chemicals and to measure the concentration of coagulation filter water phosphorus By determining the adequacy and automatically adjusting the amount of coagulant injected into the coagulation tank in real time and injecting the optimum amount of coagulant to prevent the waste of chemicals and backwash It provides an AI type cohesive filtration phosphorus removal and wastewater treatment system that minimizes the impact on phosphorus change factors such as minimization.

Description

The phosphorus removal system regarding the automatic determination of coagulant dosing rate using artificial intelligence} based on pre-measured flow rate and phosphorus concentration and phosphorus concentration of coagulated filtration water as control factors

The present invention relates to a method for removing phosphorus, one of the nutrients that cause eutrophication in rivers, lakes, and offshore, from sewage effluents. With the implementation of the Four Rivers Project, the phosphorus discharge standard of effluents in domestic sewage treatment plants has been greatly strengthened, thereby precisely treating phosphorus. It is a necessary skill at the time of need. Compared to the coagulant uniform injection method that corresponds to the expected phosphorus concentration, AI coagulant filtration phosphorus removal and wastewater treatment system that minimizes the effect on the change factors of phosphorus treatment, such as preventing the waste of chemicals and minimizing the backwash amount, It is about.

As the industry is highly developed, the seriousness of environmental pollution is increasing day by day. In particular, wastewater, factories, and livestock wastewater discharged from homes, factories, or livestock farms (hereinafter referred to as “wastewater”) flow into groundwater and rivers, and eventually pollute the sea.

Various minerals, microorganisms, nitrogen (N) and phosphorus (P) in these wastewaters cause eutrophication of rivers, which not only destroys aquatic ecosystems, but also contaminates soils, causing food chains in living environments and ecosystems. Destroying even threatens human rights to live.

On the other hand, the reason for the excessive breeding of algae is because the abundance of nitrogen and phosphorus, which are essential for the breeding in the water system, is enough to prevent the breeding of these algae if only one of nitrogen or phosphorus is insufficient.

In the conventional method for removing phosphorus, the inorganic coagulant is injected into the wastewater containing phosphorus, aggregated, and then precipitated and removed from the water system in the form of sludge. Phosphorus removal method through chemical reaction with inorganic coagulant in sewage water treatment is very well known as a textbook method, and mainly reacts with inorganic coagulant at the front end of super-sediment or sub-sedimentation tank to remove and settle the phosphorus in the final effluent. For this purpose, a method of injecting an appropriate amount of inorganic coagulant into the rear end of the seed agglomerate to agglomerate and then remove it by filtration or precipitation.

At this time, the amount of inorganic coagulant is injected in a uniform manner according to the water analysis or measured phosphorus concentration. Since the amount of inflow of sewage, the concentration of phosphorus inflow, the amount of aeration tank returning sludge and surplus sludge are not considered, Problems such as non-uniformity of treated water quality and increase in backwash water generated due to lack of water are caused.

If the concentration of phosphorus in sewage water can be measured in real time and the value can be immediately known, the coagulant injection volume can be directly adjusted to obtain the optimum treatment quality by injection of the optimal chemical. Since TP is approximately 1 hour and PO4-P is approximately 30 minutes later, its value should be sampled and measured in advance of the analysis time, so that the concentration of TP or PO4-P at the time of arrival of the coagulation tank can be known. As the amount of return sludge and the amount of excess sludge discharge change, the arrival time of the flocculation tank changes, so it is very difficult to determine the optimum amount of chemical injection. Therefore, there is a need for a system that minimizes the impact on phosphorus change factors, such as preventing the waste of chemicals and minimizing the amount of backwashing, while obtaining the optimal discharge water compared to the conventional coagulant injection method.

To solve the above problems;

In the phosphorus removal system consisting of the sedimentation tank (10), the super-sedimentation tank (20), the aeration tank (30), the seed needle tank (40), the coagulation tank (50), the filtration tank (60), and the discharge tank (70) are sequentially connected. In

 Between the aeration tank 30 and the seed needle tank 40 in order to measure the concentration of phosphorus flowing into the flocculation tank 50 necessary for agglomeration and filtration of phosphorus contained in the effluent tank 40 to be less than or equal to a set value. A first total measuring instrument 410 installed;

In order to know the amount of phosphorus flowing into the flocculation tank 50, an inflow flowmeter 200 installed at the front end of the sedimentation tank 10 and the amount of sludge conveyed from the vertical needle tank 40 to the aeration tank 30 are measured. A returned sludge discharge flow meter 210 and a surplus sludge discharge flow meter 220 for measuring the discharge of surplus sludge disposed in the seed settling tank 40;

A second total phosphorus meter 420 installed between the filtration tank 60 and the discharge tank 70 to know the concentration of phosphorus discharged from the filtration tank 60;

Calculate the amount of injected flocculant by calculating the values of the inflow flowmeter 200, the return sludge flowmeter 210, the excess sludge discharge flowmeter 220, and the first total phosphorus meter 410, and calculate the second total phosphorus meter ( An arithmetic unit 500 for judging whether or not the amount of injected flocculant is appropriate based on the value of 420;

The pre-measured flow rate and phosphorus concentration and the phosphorus concentration of the coagulant filtration water, which are included in the coagulant injection device 100 for injecting the calculated coagulant amount of the computing device 500 into the coagulation tank 50, are titrated as control factors. The solution can be solved by providing an artificial phosphorus removal system in which the flocculant injection amount is determined.

And the filtration tank 60 can be replaced by other means, such as sedimentation tank, flotation tank that can perform the same role.

The artificial coagulation filtration phosphorus removal sewage treatment system according to the present invention has been greatly strengthened (TP 2.0 mg / ℓ → 0.2, 0.3, 0.5 mg / ℓ) of phosphorus emission standard of domestic sewage treatment plant discharged by four river projects. If the phosphorus treatment is not performed precisely, it may frequently exceed the standard. Therefore, the operation stability of the whole sewage treatment process is maintained, while the amount of inorganic coagulant injected into the filtration tank is minimized to reduce the amount of backwash concentrate and the operating power cost. It minimizes the impact on phosphorus change factors such as preventing the waste of chemicals and minimizing the amount of backwashing, while obtaining the optimal discharge water compared to the coagulant uniform injection method.

1 is a conceptual diagram showing the approximate configuration of an artificial intelligence cohesive filtration phosphorus removal wastewater treatment system according to the present invention.

Hereinafter, each preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, a detailed description of related well-known technologies or configurations may unnecessarily obscure the subject matter of the present invention. If so, the detailed description thereof will be omitted.

Referring to the accompanying drawings, Figure 1 is a flow chart showing the approximate configuration of the intelligent type coagulation-filtered phosphorus removal and wastewater treatment system according to the present invention.

In the water treatment apparatus composed of a sedimentation tank 10, a super-sedimentation tank 20, an aeration tank 30, a longitudinal needle tank 40, a flocculation tank 50, a filtration tank 60, a discharge tank 70, etc. are sequentially provided. In the aeration tank 30, the first total phosphorus measuring instrument 410 measures the concentration of phosphorus flowing into the flocculation tank 50 so as to aggregate and filter phosphorus contained in the effluent water of the seed immersion tank 40 to a predetermined value or less. It is installed between the longitudinal needle tank 40, in order to know the amount of phosphorus flowing into the flocculation tank 50, the inflow flow meter 200 and the aeration tank 30 in the longitudinal needle tank 40 in front of the immersion tank (10) A sludge discharge flowmeter 210 for measuring the amount of sludge to be returned) and a surplus sludge discharge flowmeter 220 for measuring the discharge of surplus sludge disposed in the seed settling tank 40 and the inflow flowmeter 200. Measurement value (m3 / min) of the return sludge flowmeter 210 and the excess sludge discharge flowmeter 220 and the value of the first total phosphorus meter 410 (mg / L) is calculated to calculate the amount of phosphorus (mg / min) flowing into the coagulation tank 60, and the first selected coagulant required to bring the concentration (mg / L) of phosphorus inflow to the coagulation tank 60 to be below the set value after filtration. The coagulant is injected into the coagulant injection device 100 by calculating the coagulant amount (mg / min) in consideration of the concentration (mg / L). At this time, since the capacity of the seed needle tank 40 is determined, the required time for the total phosphorus concentration value (mg / L) measured by the first total phosphorus measuring instrument 410 to flow into the flocculation tank 50 can be calculated.

A second total phosphorus measuring instrument 420 which measures the phosphorus concentration of the filtered water filtered in the filtration tank 60 after aggregation in the coagulation tank 50 is installed between the filtration tank 60 and the discharge tank 70 and the filtrate phosphorus concentration is measured. Then, the feedback is corrected by judging the adequacy of the concentration of the coagulant, which was first selected by the computing device 500. In order to guarantee the settling phosphorus concentration, the phosphorus concentration of the filtrate is measured and the correlation between inflow phosphorus concentration-injection coagulant concentration-filtrate concentration is dataed and corrected at the next injection coagulant concentration setting. This ensures accurate reproducibility as data accumulates, enabling accurate system construction over time.

In addition, the filtration tank 60 can be replaced by other means, such as sedimentation tank, floating tank that can perform the same role.

10: sedimentation tank 20: super-sedimentation
30: aeration tank 40: longitudinal needle
50: coagulation tank 60: filtration tank
70: discharge tank 100: flocculant injection device
200: inflow flowmeter 210: return sludge flowmeter
220: surplus sludge discharge flow meter 410: first total measuring instrument
420: second total measuring instrument 500: computing device

Claims (2)

In the phosphorus removal system consisting of the sedimentation tank (10), the super-sedimentation tank (20), the aeration tank (30), the seed needle tank (40), the coagulation tank (50), the filtration tank (60), and the discharge tank (70) are sequentially connected. In
Between the aeration tank 30 and the seed needle tank 40 in order to measure the concentration of phosphorus flowing into the flocculation tank 50 necessary for agglomeration and filtration of phosphorus contained in the effluent tank 40 to be less than or equal to a set value. A first total measuring instrument 410 installed;
In order to know the amount of phosphorus flowing into the flocculation tank 50, an inflow flowmeter 200 installed at the front end of the sedimentation tank 10 and the amount of sludge conveyed from the vertical needle tank 40 to the aeration tank 30 are measured. A returned sludge discharge flow meter 210 and a surplus sludge discharge flow meter 220 for measuring the discharge of surplus sludge disposed in the seed settling tank 40;
A second total phosphorus meter 420 installed between the filtration tank 60 and the discharge tank 70 to know the concentration of phosphorus discharged from the filtration tank 60;
Calculate the amount of injected flocculant by calculating the values of the inflow flowmeter 200, the return sludge flowmeter 210, the excess sludge discharge flowmeter 220, and the first total phosphorus meter 410, and calculate the second total phosphorus meter ( An arithmetic unit 500 for judging whether or not the amount of injected flocculant is appropriate based on the value of 420;
It comprises a flocculant injection device 100 for injecting the calculated flocculant amount of the computing device 500 into the flocculation tank 50
An artificial phosphorus removal system in which an appropriate amount of flocculant injection is determined by using a pre-measured flow rate, phosphorus concentration and phosphorus concentration of coagulated filtration water as control factors.
According to claim 1, wherein the filtration tank (60) is replaced with a settling tank or flotation tank that can perform the same role, the appropriate flocculant injection amount by using the pre-measured flow rate and phosphorus concentration and the phosphorus concentration of the coagulated filtration water as a control factor The intelligent phosphorus removal system is determined.

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