KR102402268B1 - Physico-chemical Wastewater treatment facilities using electro-coagulation and floatation process - Google Patents

Abstract

The present invention is a physical and chemical treatment method for efficiently treating purified water, sewage and wastewater. It is a water treatment method that removes suspended solids, organic pollutants, nitrogen and phosphorus from raw water by coagulating and floating at the same time using an electrolysis treatment process. . In order to efficiently treat purified water, sewage and wastewater, a coagulant is injected as a physicochemical treatment method that applies an electrolysis treatment process to supply insufficient dielectric material in the treated raw water and use it as a coagulant. By smoothly generating the electrolysis reaction while the increased raw water passes between the electrode plates of the anode and the cathode, the suspended substances in the treated raw water are destabilized so that they can be effectively coagulated, and the agglomerated fine coagulated sludge is used in the electrolysis reaction. It relates to a physicochemical water treatment apparatus and method using an electrolytic flotation process that is removed by overflowing in the form of flocculated flotation sludge with a minimized water content by flocculation and concentration on the upper part of the electrolytic flotation tank due to the flotation action of microbubbles, which are by-products.

Description

Physico-chemical Wastewater treatment facilities using electro-coagulation and floatation process

The present invention is a physicochemical treatment method for efficiently treating purified water, sewage and wastewater. Electrolytic coagulation flotation removes suspended solids, organic pollutants, nitrogen and phosphorus from raw water by applying an electrolytic treatment process to simultaneously coagulate and float them. It relates to a water treatment device using the process.

As a method to efficiently treat purified water, sewage and wastewater by applying the electrolysis treatment process, a coagulant is supplied so that it can act as a dielectric material and a coagulant lacking in the treated raw water. By smoothly generating the electrolysis reaction, the suspended substances in the treated raw water are destabilized so that they can be effectively coagulated with the coagulant, and the coagulated fine coagulated sludge is a by-product of the electrolysis reaction between the anode and cathode electrode plates. Physicochemical using the electrolytic flotation process to flotation and concentrate to the upper part of the electrolytic flotation tank due to the flotation action of the bubbles, and to remove it by concentrating it in the form of flocculation sludge with a minimized water content in the minimum space required than the sedimentation sludge of the general coagulation sedimentation process It relates to water treatment equipment.

The general water purification, sewage and wastewater treatment process consists of a physicochemical treatment process consisting of a coagulation precipitation process as the primary treatment, a biological treatment process by microorganisms as the secondary treatment, and an advanced treatment process for nitrogen and phosphorus removal as the tertiary treatment. In general, the physicochemical treatment process, which is the primary treatment, is applied to the water treatment process to improve the overall treatment efficiency by removing suspended substances from the treated raw water to reduce the pollutant load for the subsequent biological treatment process or advanced treatment process.

Currently, most of the general physicochemical treatment processes of purified water, sewage and wastewater use the coagulation sedimentation method. In order to obtain effective sedimentation removal efficiency, a large rectangular or circular sedimentation area that requires a residence time of 2 to 3 hours is required. The required settling tank is required, and in order to additionally improve the sedimentation efficiency, it is important to improve the overall treatment efficiency of the existing water treatment process by installing additional treatment devices or supplementary devices, such as installing various types of sedimentation auxiliary devices. It is possible.

For example, in the case of water treatment, if algae occurs in rivers, rivers, or dams, which are water sources, the load on the water treatment process becomes unbearably high, making effective treatment difficult. In addition, the effluent water quality standards for sewage flowing into rivers and streams and final effluent from wastewater treatment are further strengthened through legal regulations to suppress water pollution due to the accelerated water pollution of water resources. It is necessary to supplement and additional facilities for the treatment device that can improve the treatment efficiency for the unit process of the system.

As a method to solve these problems, it is a water treatment method that can maximize the treatment efficiency of the physicochemical treatment process of water purification, sewage and wastewater treatment. By developing a physicochemical treatment process that effectively destabilizes suspended substances in the treated raw water to agglomerate and separate them by flotation, it has economical efficiency and management efficiency, while simultaneously effectively removing suspended substances, organic pollutants (BOD and COD), T-N and T-P Thus, a physicochemical water treatment system for purified water, sewage and wastewater was completed that minimizes the load of pollutants for the subsequent water treatment process and obtains maximum treatment efficiency.

An object of the present invention is to apply the electrolysis treatment process to improve the treatment efficiency in the water purification, sewage and wastewater treatment process as described above, so as to obtain the maximum treatment efficiency with the minimum required space. Using the electrolytic coagulation flotation process that maximizes the destabilization and coagulation effect of suspended substances through decomposition treatment, and enables efficient and stable treatment with economical efficiency by allowing the agglomerated suspended substances to be efficiently coagulated and separated by flotation. An object of the present invention is to provide a physicochemical water treatment device.

In order to achieve the above object, the physicochemical water treatment apparatus and method using the electrolytic coagulation flotation process of the present invention includes a flow control tank for filtering and removing foreign substances, and for efficient electrolytic treatment of raw water supplied from the flow control tank. A coagulant supply tank that supplies a coagulant through an ejector mounted on a raw water transport pipe to generate a smooth electrolysis reaction by supplying a coagulant in an appropriate concentration according to the water quality characteristics to maximize the coagulant flotation effect, and the coagulant supply The coagulant supplied from the tank flows through the raw water transport pipe of 1 m or more along with the raw water to be treated, and is uniformly mixed by the turbulence in the pipe to generate an effective electrolysis reaction. Electrolytic reaction equipped with a DC power supply and an electrode plate module in which several sheets of anode and cathode electrode plates are alternately mounted at regular intervals of 5 to 10 mm depending on the amount of processed mesh electrode plates all coated with iridium dioxide and ruthenium As it passes through the device and the electrolytic reactor, the destabilized suspended materials form the supplied coagulant and coagulated sludge, and are further coagulated while floating together with a large amount of gas gases, which are by-products of the electrolysis reaction, so that the upper part of the electrolytic coagulation flotation tank. In order to remove the flocculated sludge concentrated on the upper part of the electrolytic flotation tank, surplus air is periodically supplied from the lower part of the electrolytic flotation tank. An electrolytic coagulation tank that automatically overflows and can be removed through the sludge overflow pipe installed at the top of the electrolytic coagulation tank as it floats together, and a sludge storage tank that collects and stores the coagulated flotation sludge overflowing from the top of the electrolytic coagulation tank. It was intended to provide a physicochemical water treatment apparatus using an electrolytic coagulation flotation process, characterized in that it is provided.

As an effect of the present invention, it is possible to minimize the amount of sludge generated by minimizing the moisture content of the flocculated sludge by removing suspended substances in purified water, sewage and wastewater in the form of flocculated sludge, and organic matter containing a large amount in the form of suspended substances in the treated raw water. By maximizing the removal efficiency of contaminants, T-N and T-P components, it provides the advantage of stable and efficient treatment by minimizing the load of contaminants for the biological treatment process or advanced treatment process, which is a follow-up treatment process. In addition, it is possible to minimize the space required by simplifying the water treatment process, and provides the effect of maximizing the economic efficiency, convenience of maintenance, and the treatment efficiency of the entire water treatment process.

1 is a process configuration diagram of a physicochemical water treatment apparatus using an electrolytic coagulation flotation process.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

In the physicochemical water treatment apparatus and method using the electrolytic coagulation flotation process of the present invention, Figure 1 shows the process configuration diagram of the physicochemical water treatment apparatus using the electrolytic coagulation flotation process of the present invention,

The physicochemical water treatment apparatus and method using the electrolytic coagulation flotation process of the present invention is a flow control tank 100, a raw water transfer pump 110, a coagulant supply tank 200, an ejector 210, a coagulant supply pump 220, electrolysis Reactor 300, electrode plate module 310, DC power supply 320, electrolytic coagulation flotation tank 400, electrolytic treatment water inlet 410, coagulated sludge blocking network 420, floating air supply port ( 430), a floating air supply device 440, a final treated water outlet 450, a sludge overflow pipe 460, and a sludge storage tank 500,

These are described in detail as follows.

The physicochemical water treatment apparatus using the electrolytic coagulation flotation method of the present invention includes a flow rate control tank 100 that minimizes the physical load on the subsequent treatment process by filtering and removing foreign substances in the raw water of purified water, sewage and wastewater;

Raw water transfer pipe so that it can be used as a coagulant at the same time as an effective electrolysis reaction by supplying a coagulant to supply insufficient dielectric materials for the smooth electrolytic treatment of the raw water supplied from the flow control tank 100 by the raw water transfer pump 110 A coagulant supply tank 200 provided with a coagulant supply pump 210 for supplying an appropriate concentration of a coagulant according to water quality characteristics through an ejector 220 mounted on the

The coagulant supplied from the coagulant supply tank 200 to the raw water to be treated is supplied through the ejector 220 mounted on the raw water transport pipe to be uniformly dispersed due to the turbulence caused by the flow rate while flowing through the raw water transport pipe of 1 m or more. The electrode plate module 310 is installed in the electrolytic reaction device 300 while allowing the reaction to occur effectively and is installed to be detachable like a flange by separating the ejector 220 at a distance of 1 m or more from the rear end for convenience of management. an electrolytic reaction device 300 and

The electrolytic reactor 300 has a hydraulic residence time of about 10 to 15 seconds and has a circular or polygonal tubular shape, and the electrode plate module 310 mounted in the electrolytic reactor 300 has both positive and negative electrode plates. Using an electrode plate coated with iridium dioxide and ruthenium on a mesh titanium plate, several mesh positive and negative plates are alternately mounted at regular intervals of about 5 mm to 10 mm depending on the quality of the treated water, and the electrode plate module 310 is passed. During the electrolysis reaction, in order to destabilize suspended substances in the treated raw water to promote the formation of flocculated sludge and to facilitate the flotation of the formed flocculated sludge, gas gases, which are by-products generated by the electrolysis reaction of each electrode plate, are efficiently discharged. An electrolytic reaction device 300 configured to generate and float together with coagulated sludge;

The electrolytic coagulation flotation tank 400 installed at the rear end of the electrolytic reaction device 300 is structurally divided into an upper part and a lower part. An electrolytically treated water inlet ( 420) and the lower part of the floating air supply port 430 and the floating air supply device 440 installed to supply excess floating air, and the flocculated sludge blocking network 410 to separate the flocculated sludge and lower it. The final treated water outlet 460 for allowing the final treated water, whose sedimentation is blocked, to flow out to the bottom of the electrolytic coagulation tank 400, and an electrolytic coagulation pipe 460 installed at the top of the electrolytic coagulation tank 400 The floating tank 400 and

The structure of the electrolytic coagulation buoyancy tank 400 requires a hydraulic residence time of 10 to 15 minutes, and the cross-sectional area of the part connected from the lower part to the upper part is a circular or polygonal standing structure, and the cross-sectional area of the upper part is gradually reduced. It is designed to have a cross-sectional area less than 1/2 times that of the lower part. This progressively reduced structure allows the flocculated sludge formed during the electrolysis treatment to pass through the gradually reduced space together with gas gases, which are by-products of the electrolysis reaction. The flocculation flotation tank 400 is naturally flocculated and concentrated, and in order to remove the flocculation flotation sludge layer concentrated on the upper part of the electrolytic flotation flotation tank 400, the floating air located at the lower part of the flocculation sludge blocking net 410 The surplus floating air is periodically supplied by the floating air supply device 440 through the supply port 430 to form an air layer. It is composed of a physicochemical water treatment device using an electrolytic coagulation flotation process that causes the flotation and condensed flotation sludge layer to float together and naturally overflow through the sludge overflow pipe 460 to be discharged to the sludge storage tank 500 .

Table 1 shows the treatment effects of each pollutant by the electrolytic coagulation flotation process.

Analysis items Raw water (mg/L) Treated water (mg/L) Removal efficiency (%) BOD 282 138 51.0 COD 302 149 50.7 T-N 218 115 47.3 T-P 6.8 0.6 91.2

As shown in Table 1, by applying the physicochemical water treatment method by the present invention electrolytic coagulation flotation method, it is confirmed that the removal effect of BOD and COD is 50% or more, T-N is 47% or more, and T-P is 91% or more. could

The present invention described above can be embodied in other various forms without departing from the principle theory, technical and structural characteristics. Accordingly, the above embodiments are merely examples in all principles and should not be construed as limiting.

When the physicochemical water treatment process using the electrolytic coagulation flotation process is applied compared to the coagulation precipitation process, which is a physicochemical treatment process for general water purification, sewage and wastewater treatment, economic efficiency, management efficiency and convenience, and maximum treatment with minimum required area It can be used as a treatment method that can achieve efficiency, and if the electrolytic coagulation flotation process is applied as a complementary device to the physicochemical treatment process as an improvement method to improve the treatment efficiency of the existing water treatment process, it requires minimal space for subsequent treatment processes. It can be used as a physicochemical water treatment device that can maximize the treatment efficiency of the entire water treatment process by reducing the pollution load as much as possible.

100: flow control tank
110: raw water transfer pump
200: coagulant supply tank
210: ejector
220: coagulant supply pump
300: electrolytic reaction device
310: electrode plate module
320: DC power supply
400: electrolytic cohesive flotation tank
410: agglomerated sludge blocking network
420: electrolytic treatment water inlet
430: floating air supply port
440: floating air supply device
450: final treated water outlet
460: sludge overflow pipe
500: sludge storage tank

Claims (4)

In the water treatment apparatus using the electrolytic coagulation flotation process,
A flow control tank that filters and removes foreign substances in purified water, sewage and wastewater;
a coagulant supply tank installed with a coagulant supply pump for supplying a coagulant from the flow control tank to an appropriate concentration according to the water quality characteristics of the raw water to be treated through an ejector mounted on a raw water transport pipe;
An electrolytic reaction device equipped with a DC power supply device and an electrode plate module for supplying DC power while being separated by at least 1 m from the rear end of the ejector and connected in a detachable flange form to the raw water transport pipe;
The electrolytic coagulation flotation tank installed at the rear end of the electrolytic reaction device is divided into an upper part and a lower part. The electrolytic treatment water inlet installed at the upper part and the flotation tank installed in the lower part with the flocculated sludge blocking net and the flocculated sludge blocking net installed in the middle of the lower part as a boundary. An electrolytic coagulation tank having an air supply port and a floating air supply device, a final treated water outlet installed at the bottom of the lower part, and a sludge overflow pipe installed at the top of the electrolytic coagulation tank;
The uppermost part of the electrolytic coagulation flotation tank is a physicochemical water treatment device using an electrolytic coagulation flotation process, characterized in that it is composed of a sludge storage tank directly connected to the sludge overflow pipe. According to claim 1, wherein the electrolytic reactor is installed in the form of a detachable flange at the rear end of the ejector of the raw water transport pipe, has a hydraulic residence time of about 10 to 15 seconds and a tube shape of a circular or polygonal structure, in the electrolytic reactor The installed electrode plate module uses an electrode plate coated with iridium dioxide and ruthenium on a mesh titanium plate for both the positive and negative plates, and is an electrolytic electrode in which several mesh positive and negative plates are alternately installed at regular intervals of about 5 mm to 10 mm depending on the quality of the treated water. A physicochemical water treatment device using an electrolytic coagulation flotation process, characterized in that it consists of a reaction device and a DC power supply for supplying DC power The electrolytic coagulation flotation tank according to claim 1, wherein the electrolytic coagulation flotation tank has a hydraulic residence time of 10 to 15 minutes and a circular or polygonal standing structure, divided into upper and lower parts, and a coagulation sludge blocking net installed in the middle part of the lower part of the electrolytic coagulation flotation tank. The electrolytic treatment water inlet connected to the upper part of the border so that the treated raw water flows into the upper part, and the flotation air supply port and the floating air supply device and the electrolytic coagulation device for removing the flocculated sludge layer by supplying surplus floating air to the lower part. A final treated water outlet is installed at the bottom of the flotation tank to separate the flocculated sludge by a flocculation sludge blocking net and discharge the final treated water whose sedimentation is blocked to the bottom. is connected in a structure in which the cross-sectional area is gradually reduced, and the cross-sectional area of the upper part is designed to have a cross-sectional area less than 1/2 times that of the lower part. Physicochemical water treatment device using an electrolytic coagulation flotation process, characterized in that it is agglomerated while being floated and is structurally concentrated on the upper part of the electrolytic flotation tank [Claim 2] The flotation air according to claim 1, wherein the surplus floating air is periodically removed from the lower part of the flocculated sludge blocking net installed in the middle part of the lower part of the electrolytic flotation flotation tank in order to remove the flocculated flotation sludge layer that has been flocculated and floated on the upper part of the electrolytic coagulation flotation tank. It is supplied through the supply device and due to the water level rise effect due to the flotation action of the excess air layer, the concentrated flocculated flotation sludge layer is floated on the upper part of the electrolytic coagulation flotation tank, and it automatically overflows into the sludge storage tank through the sludge overflow pipe and is discharged. A physicochemical water treatment device using an electrolytic coagulation flotation process.

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