KR20240025103A - Injector mixed pressurized flotation system - Google Patents

Abstract

The present invention relates to an injector mixed pressure flotation system.
The purpose of the present invention is to coagulate the sludge contained in sewage more easily and stably by mixing polyaluminum chloride (PAC) and polymer with water, and in addition, to activate sludge coagulation by generating microbubbles. The aim is to provide an injector mixed pressure flotation system that can greatly increase the treatment efficiency of sludge contained in sewage by providing additional functions and at the same time ensuring smooth and continuous flotation of the flocculated sludge.
Therefore, specific means of the present invention for achieving the above object include:
A compound supply unit consisting of a first chemical tank and a second chemical tank;
A flocculating agent mixing unit consisting of a rapid mixing tank and a flocculation tank;
Sewage dispersion treatment delivery unit consisting of an in-line code mixer and suction injector;
A sludge flotation treatment unit consisting of a reaction tank, a bubble generator, and a scum discharge unit;
This is achieved by forming a sewage circulation treatment unit consisting of a circulation pressurization pump, a circulation injector, an air contact pressure tank, and a circulation inlet pipe.

Description

Injector mixed pressurized flotation system}

The present invention relates to a system for purifying water (T-N, T-P) and removing organic matter using low power and efficient chemicals, and more specifically, to a system for coagulation flotation using polymer compounds and microbubbles and forced purification using air contact pressure. This relates to an injector mixed pressure flotation system that removes nitrogen (T-N), phosphorus (T-P), and organic matter contained in sewage through a method.

Due to the continuous promotion of sewage pipe maintenance and sewage treatment plant construction projects, the amount of sewage sludge generated as a final product of sewage treatment plants is increasing significantly by more than 3.5 million tons every year as of 2016.

Here, sewage sludge refers to the final by-product that is physically and chemically separated in the process of treating purified water, sewage, industrial wastewater, excrement, etc., for example, sediment generated when suspended matter in water is separated from liquid.

This type of sewage sludge has a very large volume due to its high moisture content and is easily corrupted due to its high content of organic matter and pathogens. In particular, the strong odor generated during the decomposition process has a negative impact not only on the surrounding air but also on human health and is a serious harmful factor. It has material properties that make it work.

The conventional disposal method for sewage sludge was to rely on landfilling until 2003, but since 2003, environmental laws have stipulated that "direct landfilling of sludge in sewage treatment plants with a facility capacity of 10,000 tons or more per day is prohibited." Due to regulations, most sewage sludge treatment methods were converted to ocean discharge, and there were cases where more than 70% of the sewage sludge generated was treated by ocean discharge until 2005.

However, with the international conventions concluded since 2012, for example, regulations on ocean discharge of waste have been greatly strengthened, even ocean discharge methods for sewage sludge and livestock wastewater are currently completely banned. Therefore, in recent years, existing landfills have been used. The development and demand for sewage sludge treatment technology that can replace disposal and ocean discharge methods is rapidly increasing.

Accordingly, a representative example of a sewage sludge treatment method that has been used recently is the sludge sedimentation method.

The sludge sedimentation method is a device configuration in which sewage (wastewater) flows through it in stages, for example, constructing a system consisting of a first sedimentation tank, an aeration tank, and a second sedimentation tank, and in the system constructed as such, the aeration tank required for a chemical reaction is installed. It cultivates purifying microorganisms (aerobic bacteria) that decompose organic matter by supplying oxygen, and has the characteristic of separating and removing sewage sludge by sequentially performing oxidative decomposition, coagulation, adsorption, and precipitation by the cultured purifying microorganisms.

However, this sludge precipitation method requires a considerable period of time, approximately 2 to 3 days, to purify sewage (wastewater), and also requires a very large installation area of the system, requiring a series of treatments to remove sludge. The problem is that the work is very inefficient, unproductive, and uneconomical.

Meanwhile, another example of a conventional water quality (T-N, T-P) purification and organic matter treatment method is a sewage treatment method using a pressure flotation separation device.

The sewage (wastewater) treatment method using a sludge flotation separation device consists of removing T-N and T-P contained in sewage (wastewater), flocculating organic matter and floating it on the water surface, and separating and removing only the flocculated sludge. .

For example, the flotation separation method is one of the common water treatment methods that uses microbubbles to float light organic matter in the water to the surface. This flotation separation method causes suspended particles that are difficult to sink due to high buoyancy and to the bottom of the water surface due to low buoyancy. It is widely used as a useful method to simultaneously remove settling particles.

However, the conventional T-N, T-P removal and organic matter removal methods described above consist of an air compressor and auxiliary equipment that consume excessive power to generate fine bubbles. For example, as pressurization and decompression control are not easy, the sludge flotation efficiency is reduced, and as a result, there is a problem in that the sludge is dispersed and separated into multiple layers without smoothly coagulating and forming a single layer. Additionally, the sludge is instantly separated. Even if there is flotation, there is a problem that the flocculated sludge settles over time without the lasting effect, and the structure of the series of sewage (wastewater) circulation supply systems for sludge removal is very complex, difficult, and unsystematic. Accordingly, there is a problem that an efficient sludge removal function cannot be expected.

Therefore, the development of a technology that can stably treat high-concentration organic sewage sludge, including livestock waste, as well as food and food wastewater, remains an urgent task.

Republic of Korea Patent Registration No. 1358822 (registered on January 28, 2014) Republic of Korea Patent Registration No. 1707776 (registered on February 10, 2017)

The present invention was created to solve the general problems of conventional sewage sludge removal devices using flocculation and flotation;

The purpose of the present invention is to coagulate sludge contained in sewage more easily and stably by mixing synthetic polymer compounds, such as poly aluminum chloride (PAC) and polymer, with water. In addition, the injector mixing type provides an additional flocculation function by generating fine bubbles and at the same time ensures smooth and continuous flotation of the flocculated sludge, thereby greatly increasing the treatment efficiency of sludge contained in sewage. To provide a pressure flotation system.

The object of the present invention is to, in the sewage charged into the flotation sludge treatment tank, the flocculated sludge floating on the water surface is first removed through a scum discharge unit, and some of the sludge in a non-flocculated state, such as floating sludge, is included. The sewage below the water's surface is recirculated into the flotation sludge treatment tank through the circulation unit to perform the sludge removal function in a repetitive flow form, greatly improving the purification function and minimizing environmental pollution through the improved purification function. The aim is to provide a one-injector mixed pressure flotation system.

The purpose of the present invention is to minimize the facility area by constructing a series of systems built with a systemized and simplified structure, and also to rapidly and accurately treat sludge contained in sewage, thereby significantly increasing the sludge treatment capacity compared to time. , to provide an injector mixed pressure flotation system that greatly improves economic performance, work efficiency, and equipment handling.

Therefore, specific means of the injector mixed pressure flotation system according to the present invention to achieve the above object include;

A compound supply unit consisting of a first chemical tank supplying polymer and a second chemical tank supplying polyaluminium chloride;

A rapid mixing tank supplied with polyaluminum chloride from the second chemical tank to perform a primary agitation with the initially incoming sewage, and a tank supplied with polymer from the first chemical tank to perform a secondary agitation with the overflowing sewage. A coagulant mixing unit consisting of a coagulant tank;

A sewage dispersion treatment delivery unit consisting of an in-line code mixer that receives the stirred sewage from the coagulant agent mixing unit and disperses and discharges the sewage through a grinding action, and a suction injector that supplies high-pressure air to the dispersed and discharged sewage;

A sludge flotation treatment unit consisting of a reaction tank for inflowing and receiving sewage discharged from the sewage dispersion treatment delivery unit, a bubble generator for generating fine bubbles in the incoming and received sewage, and a scum discharge unit for collecting and discharging coagulated sludge floating on the water surface;

A circulation pressure pump for forcibly suctioning sewage below the water surface in the reaction tank, a circulation injector for supplying high-pressure circulation air to the suctioned sewage, an air contact pressure tank for receiving and storing the sewage supplied with high-pressure circulation air, and an air contact pressure tank. This is achieved by forming a sewage circulation treatment unit consisting of a circulation inflow pipe that delivers the sewage stored in the pressure tank to the sewage distribution treatment delivery unit.

Above, the injector mixed pressure flotation system according to the present invention mixes polyaluminum chloride (PAC) and polymer with water to easily and stably coagulate the sludge contained in sewage, and in addition, fine By generating bubbles, an additional flocculation function is provided and at the same time, the floating action of the flocculated sludge is also smoothly achieved, which has the effect of increasing the treatment efficiency of sewage sludge.

In addition, the injector mixed pressure flotation system according to the present invention primarily removes the flocculated sludge that has floated to the surface of the water through a scum discharge unit, and sewage below the water surface containing some floating sludge is repeatedly circulated through a circulation unit. Sludge is removed redundantly by a continuous flow method, which improves the purification treatment function and provides the effect of minimizing environmental pollution through the improved purification function.

Alternatively, the injector mixed pressure flotation system according to the present invention not only minimizes the facility area by constructing a series of system configurations in a systematic and simplified layout structure, but also performs the sludge treatment function contained in sewage quickly and accurately, saving time. Compared to this, the sludge treatment capacity has been significantly increased, which provides very useful expected effects such as improving economic efficiency, work efficiency, and facility handling.

Figure 1 is an overall equipment configuration diagram of the injector mixed pressure flotation system according to the present invention.
Figure 2 is an enlarged configuration diagram of the coagulant mixing unit applied to the present invention
Figure 3 is an enlarged configuration diagram of the sewage dispersion treatment transmission unit applied to the present invention
Figure 4 is an enlarged configuration diagram of the sludge flotation treatment unit applied to the present invention
Figure 5 is an expanded configuration diagram of the sewage circulation treatment unit applied to the present invention

Hereinafter, the configuration of a preferred embodiment of the injector mixed pressure flotation system according to the present invention will be described in detail based on the accompanying drawings.

Looking at the schematic configuration of the injector mixed pressure flotation system according to the present invention with reference to the attached drawings;

It consists of a compound supply unit (1), a coagulant mixing unit (2), a sewage dispersion treatment delivery unit (3), a sludge flotation treatment unit (4), and a sewage circulation treatment unit (5). (Not shown in the drawings) Code 6 is the operation control panel)

Here, first, the compound supply unit 1 is a means for supplying and administering a polymer compound to the initially flowing sewage in order to increase the coagulation rate of sludge contained in the contaminated sewage to be purified and treated. The same compound supply unit 1, as shown in FIG. 1, fills and receives the polymer in an aqueous solution state, and drives the filled polymer into a flocculation tank 22, which will be described later, by driving the first discharge pump P1. forming a first chemical tank (11) supplied to the first chemical tank (11), and filling and receiving polyaluminum chloride (PAC: poly minium chloride) in an aqueous solution in a configuration spaced apart from the first chemical tank (11), and filling the filled polychloride. It is preferable to form a second chemical tank (11) that supplies aluminum (PAC) to the rapid mixing tank (21) described later by driving the second discharge pump (P2). (L1, not shown in the drawing, refers to the polymer supply line. , L2 is polyaluminum chloride supply line)

At this time, the polymer filled and received into the first chemical tank 11 is a type of polymer in which monomers are repeatedly linked, and is a well-known material widely applied across all fields of water treatment because it has excellent adsorption cross-linking and coagulation properties. have characteristics;

Polyaluminium chloride (PAC: poly minium chloride) filled into the second chemical tank 12 is a type of synthetic polymer coagulant and is a polymer made of aluminum and hydrochloric acid. It is used as a coagulant in water treatment processes such as water, sewage, and industrial wastewater. It has well-known material properties that are widely applied.

In addition, the coagulant mixing unit 2 is a means for evenly mixing the polymer compounds, such as polymer and polyaluminum chloride (PAC) supplied from the above-described compound supply unit 1, with the initially incoming sewage. As shown in Figure 1 or Figure 2, this coagulant agent mixing unit (2) receives polyaluminium chloride (PAC) from the above-described second agent tank 12 and primarily mixes it with the initial inflow sewage. A rapid mixing tank 21 for stirring is formed, and the first stirred sewage is delivered from the rapid mixing tank 21 in an overflow method, and at the same time, polymer is further supplied from the above-described first chemical tank 11. A flocculation tank (22) is formed to secondarily agitate the overflowing sewage and polymer, and the rapid mixing tank (21) and the flocculation tank (22) are again connected to an overflow induction hole as shown in FIG. It is preferable to form a combined structure in which the left and right sides are isolated and connected by an overflow diaphragm (23) having (231).

At this time, as shown in Figure 1 or 2, the rapid mixing tank 21 is provided with an initial sewage inlet 211 on one upper outer surface and an initial sewage mixing chamber 212 in the inner space, and the initial sewage mixing is carried out. An initial sewage mixing unit 213 is further installed in the room 212, wherein the initial sewage mixing unit 213 includes a first drive motor (M1) and a first drive motor (M1) that rotates. 1 A drive shaft (213-1), a first impeller (213-2) integrally coupled to the lower end and the center of the first drive shaft (213-1) in an upper and lower multi-stage spaced structure, and the first impeller (213-2) A polyaluminum chloride inlet hopper (213-3) having an injector mixing type injection nozzle structure is integrated and formed on the upper surface of the coupled first drive shaft (213-1). (Not shown, symbol L3 is the mixing tank auxiliary drain line. )

In addition, as shown in Figure 1 or 2, the flocculation tank 22 is provided with a sewage discharge port 221 on one upper outer side and an overflow sewage mixing chamber 222 in the inner space, and the overflow sewage mixing chamber ( 222), an overflow sewage mixing unit 223 is further installed, wherein the overflow sewage mixing unit 223 includes a second drive motor (M2) and a second drive shaft rotating by the second drive motor (M2). (223-1) and a second impeller (223-2) integrally coupled to the lower end and the center of the second drive shaft (223-1) in an upper and lower multi-stage spaced structure, and the second impeller (223-2) is combined. A polymer inlet hopper (223-3) having an injector-mixed spray nozzle structure is integrated and formed on the upper surface of the second drive shaft (223-1) (not shown in the drawing, symbol L4 is a flocculation tank auxiliary drainage line).

In addition, the sewage dispersion treatment delivery unit 3 flows sewage in which polymer and polyaluminium chloride (PAC) are evenly mixed through the flocculant mixing unit 2 described above to the sludge flotation treatment unit 4 described later. It is a kind of intermediate means for delivering, and as shown in FIG. 1 or 3, the sewage dispersion treatment delivery unit 3 sucks and pulverizes the agitated sewage delivered from the above-mentioned coagulant agent mixing unit 2 to disperse and discharge the water. It is preferably formed with an in-line code mixer 31 that supplies high-pressure air to the sewage dispersed and discharged through the in-line code mixer 31. (The symbol L5, not shown in the drawing, supplies agitated sewage. line)

In addition, the sludge flotation treatment unit 4 is a means for receiving sewage discharged from the above-described sewage dispersion treatment delivery unit 3, flocculating and flotating the sludge contained in the inflow and receiving sewage, and removing the sludge to the outside. As shown in FIG. 1 or FIG. 4, the same sludge flotation treatment unit 4 includes a reaction tank 41 for receiving and receiving sewage discharged from the above-mentioned sewage dispersion treatment delivery unit 3, and the reaction tank 41. A bubble generator (42) that generates fine bubbles in the incoming sewage and activates the coagulation reaction of the sludge contained in the incoming sewage, and collects and discharges the sludge that is coagulated by the activation reaction of the fine bubbles and floats to the water surface. Non-buoyant foreign matter collection that collects and collects foreign matter that settles in a non-floating state without being able to coagulate on the scum discharge unit 43 and the inner lower surface of the reaction tank 41, such as stones, glass, and metal pieces that do not float in water. It is desirable to form a groove 44 (not shown in the drawing, symbol L6 is the collected foreign matter sales line, and L7 is the treated sewage discharge line).

At this time, the scum discharge unit 43 includes a sludge transport conveyor 431 that collects and transports the coagulated sludge floating on the water surface in a continuous driving manner, as shown in FIG. 4, and a sludge transport conveyor 431 that is transported by the sludge transport conveyor 431. It is preferably formed with a sludge collection hopper 432 that drops and collects the coagulated sludge, and a sludge discharge pipe 433 that discharges the coagulated sludge collected by the sludge collection hopper 432.

Lastly, the sewage circulation treatment unit (5) forcibly circulates the sewage below the water surface of the reaction tank (41), which contains some of the sludge remaining inside the reaction tank (41), such as suspended sludge, in a non-agglomerated state, thereby repeatedly This sewage circulation treatment unit 5, which is a means of performing purification work, circulates and discharges the sewage below the water surface as shown in Figure 1 or Figure 5 in the sewage received in the above-mentioned reaction tank 41. A circulation pressurization pump 51 that forcibly suctions through a pipe 511, a circulation injector 52 that supplies high-pressure circulating air to the circulating sewage suctioned by the circulation pressurization pump 51, and the high pressure supplied. An air contact pressure tank 53 that accommodates and stores circulating air and sewage, and the sewage stored in the air contact pressure tank 53 is delivered to the above-described sewage dispersion treatment delivery unit 3 by high-pressure air, as shown in Figure 1 or As shown in FIG. 5, it is preferable to form a circulation inlet pipe 54 that circulates and supplies it into the reaction tank 41.

At this time, the air contact pressure tank 53 forms a pressure control valve (V1) on one upper side as shown in FIG. 1, and the air contact pressure tank ( A pressure circulating water discharge pipe 531 is further connected to regulate the pressure inside the air contact tank 53 by discharging a certain amount of high-pressure compressed air and circulating sewage stored in 53), and the pressure circulating water discharge pipe 531 is formed. As shown in the figure, the discharged circulating sewage and foreign substances contained in the circulating sewage are dispersed by high pressure and are used to prevent contamination of surrounding facilities and at the same time to purify the discharged sewage through recirculation. 41) Connect to one side of the upper part.

Accordingly, the operating functions of the injector mixed pressure flotation system according to the present invention formed with the above series of configurations are as follows.

First, the initial sewage to be purified and treated is allowed to flow into the rapid mixing tank (21) formed by the coagulant mixing unit (2), and at the same time, polyaluminum chloride is supplied from the second chemical tank (12) and the initial incoming sewage is mixed with the initial sewage. Polyaluminum chloride is mixed in a primary form by the early sewage mixing unit (213) in the early sewage mixing chamber (21).

At this time, the mixing weight ratio of the initial inflow sewage and polyaluminium chloride is preferably limited to the range of 95:5 to 98:2, and in particular, the supplied polyaluminum chloride is supplied through the upper part of the polyaluminium chloride inlet hopper (213-3). It is introduced through the injector mixing nozzle spraying method to increase the mixing and stirring efficiency with the initial sewage.

In addition, in the next process, the initial inflow sewage mixed with the polyaluminum chloride in a primary form is allowed to flow into the overflow sewage mixing chamber 222 formed by the flocculation tank 22 through the overflow induction hole 231, and at the same time, the first Polymer is supplied from the chemical tank, and the overflowing sewage and polymer are mixed in a secondary form by the overflowing sewage mixing unit (223).

At this time, the mixing weight ratio of overflow inflow sewage and polymer is preferably limited to the range of 95:5 to 98:2, and in particular, the supplied polymer is injected through the upper part of the polymer inflow hopper (223-3) through an injector mixed nozzle spray method. to increase the mixing and stirring efficiency with the initial sewage.

In addition, in the next process, the sewage that has been stirred into primary and secondary forms through the coagulant agent mixing unit (2) is sucked and pulverized by the in-line cord mixer (31) formed by the sewage dispersion treatment delivery unit (3) to the sludge flotation treatment unit. It is allowed to flow into the reaction tank 41 formed by (4), and during the inflow process, high-pressure air is supplied by the suction injector 32 to make the delivery of the agitated sewage flowing into the reaction tank 41 easier and smoother. .

In addition, in the next process, when the agitated sewage is introduced and delivered to the reaction tank 41 through the sewage dispersion treatment delivery unit 3, fine bubbles are generated and applied to the inflow agitated sewage through the bubble generator 42, thereby agitating the agitated sewage. Activates the coagulation reaction between sludge contained in sewage and high molecular compounds, such as polymers and polyaluminum chloride, and transports the sludge formed by the scum discharge unit (43), which coagulates by the activation reaction by microbubbles and floats to the surface of the water. The sludge is collected separately by the conveyor 431 and the sludge collection hopper 432 and discharged through the sludge discharge pipe 433, and foreign substances that do not coagulate but settle in a non-floating state, such as stones, glass, and metal pieces, that do not float in water. Foreign matter is collected by the non-buoyant foreign matter collection groove (44) and then discharged and removed separately.

In addition, in the next process, in the reaction tank 41 formed by the sewage dispersion treatment delivery unit 3, sewage containing a portion of suspended sludge that has not been coagulated below the water surface of the reaction tank 41 is transferred to the sewage circulation treatment unit 5. As shown in FIG. 1, the circulation pressurization pump 51, the circulation injector 53, the air contact pressure tank 53, and the net inflow pipe 54 are formed to force circulation to perform a repetitive purification treatment of sewage. By doing this, a sewage sludge separation and removal system using flocculation and flotation according to the present invention is implemented. ,

1: Compound supply section 2: Coagulant mixing section
3: Sewage dispersion treatment delivery unit 4: Sludge flotation treatment unit
5: Sewage circulation treatment unit 11: First chemical tank
12: Second chemical tank 21: Rapid mixing tank
22: coagulation tank 23: overflow diaphragm
31: In-line code mixer 32: Suction detector
41: reaction tank 42: bubble generator
43: Scum discharge unit 44: Non-buoyant sludge collection groove
51: circulation pressurization pump 52: circulation injector
53: Air contact pressure tank 54: Circulation inlet pipe

Claims (4)

A compound supply unit consisting of a first chemical tank (11) that supplies polymer by driving the first discharge pump (P1) and a second chemical tank (12) that supplies polyaluminium chloride by driving the second discharge pump (P2). (One);
A rapid mixing tank (21) in which polyaluminum chloride is supplied from the second chemical tank (12) and the supplied polyaluminum chloride and initial inflow sewage are first stirred, and the sewage first stirred from the rapid mixing tank (21) A flocculating agent mixing unit (2) consisting of a flocculation tank (22) that receives the overflow inflow method and further supplies polymer from the first chemical tank (11), thereby secondary agitation of the overflowing sewage and polymer;
An in-line code mixer (31) that receives the agitated sewage from the coagulant agent mixing unit (2), suctions, pulverizes, and disperses and discharges the agitated sewage, and a suction injector (32) that supplies high-pressure air to the dispersed and discharged sewage. A sewage distribution treatment delivery unit (3) consisting of;
A reaction tank (41) for receiving the sewage discharged from the sewage distribution treatment delivery unit (3), and a bubble that generates fine bubbles in the sewage flowing into and receiving the reaction tank (41) to activate the coagulation reaction of the sludge contained in the sewage. A sludge flotation treatment unit (4) consisting of a generator (42) and a scum discharge unit (43) that collects and discharges the sludge that coagulates and floats to the water surface;
Regarding the sewage flowing into and receiving the reaction tank (41), the sewage below the water surface where the coagulated sludge is floating is forcibly sucked by the circulation pressurization pump (51) through the circulation discharge pipe (511), and the circulation pressurization pump (51) sucks the sewage below the water surface where the coagulated sludge has floated. A circulation injector (52) that supplies high-pressure circulating air to flowing sewage, an air contact pressure tank (53) that accommodates and stores sewage supplied with high-pressure circulating air, and the sewage stored in the air contact pressure tank (53) An injector mixed pressure flotation system, characterized in that it is formed by a sewage circulation treatment unit (5) consisting of a circulation inlet pipe (54) that is delivered to the distributed treatment delivery unit (3) and circulated and supplied to the reaction tank (41).
According to claim 1;
The rapid mixing tank 21 includes an initial sewage inlet 211 on the upper outer side and an initial sewage mixing chamber 212 in the inner space, and an initial sewage mixing unit 213 in the initial sewage mixing chamber 212. Further installed and formed, the initial mixing unit includes a first drive motor (M1), a first drive shaft (213-1) rotating by the first drive motor (M1), and a first drive shaft (213-1). ) Injector mixed injection on the upper surface of the first impeller (213-2) integrated and coupled to the lower and central parts in an upper and lower two-stage spaced structure, and the first drive shaft (213-1) to which the first impeller (213-2) is coupled. A polyaluminium chloride inlet hopper (213-3) having a nozzle structure is integrated and formed;
The flocculation tank 22 includes a sewage outlet 221 on the upper outer side and an overflow sewage mixing chamber 222 in the inner space, and an overflow sewage mixing unit 223 is installed in the overflow sewage mixing chamber 222. Further installed and formed, the overflow sewage mixing unit 223 includes a second drive motor (M2), a second drive shaft (223-1) rotating by the second drive motor (M2), and a second drive shaft (223). -1) A second impeller (223-2) integrated and combined in an upper and lower multi-stage spaced structure at the lower end and the center, and an injector mixed type on the upper surface of the second drive shaft (223-1) to which the second impeller (223-2) is coupled. A polymer inlet hopper (223-3) having a spray nozzle structure is integrated and formed;
An injector mixing type pressure flotation system, characterized in that the rapid mixing tank (21) and the flocculation tank (22) are combined in a left and right isolation connection structure by an overflow diaphragm (23) having an overflow induction hole (231).
According to claim 1;
The sludge flotation treatment unit (4) includes a reaction tank (41), a bubble generator (42) on one outer surface of the lower part of the reaction tank (41), and a scum discharge unit (43) that collects and discharges the coagulated sludge floating on the water surface of the sewage in the reaction tank (41). ) and a non-buoyant foreign matter collection groove (44) formed on the lower surface of the reaction tank (41) to collect and collect foreign matter that settles in a non-floating state without being able to coagulate;
The scum discharge unit 43 includes a sludge transport conveyor 431, a sludge collection hopper 432 that drops and collects the coagulated sludge transported by the sludge transport conveyor 431, and the sludge collected by the sludge collection hopper 432. An injector mixed pressure flotation system, characterized in that it is formed with a sludge discharge pipe 433 that discharges coagulated sludge.
According to claim 1;
The air contact pressure tank 53 is a pressure circulating water discharge pipe ( 531) to form further connections;
The pressure circulating water discharge pipe 531 is an injector mixed pressure flotation system, characterized in that it is connected to one side of the upper part of the reaction tank 41 so that the discharged circulating sewage and foreign substances contained in the circulating sewage are recirculated and purified.