KR102509194B1 - Sewage treatment system - Google Patents

Abstract

The present invention relates to a sewage treatment system and a sewage treatment method using the same and, more specifically, to a sewage treatment system and a sewage treatment method using the same which distribute and supply sewage, inputted to a flow amount adjusting tank at the beginning of a sewage treatment process, into a reaction tank and an anaerobic tank so as to increase removal efficiency of nitrogen and phosphorus.

Description

Sewage treatment system

The present invention relates to a sewage treatment system, and more particularly, to a sewage treatment system for distributing and supplying sewage introduced into a flow control tank to a reaction tank and an anaerobic tank at the beginning of a sewage treatment process in order to increase nitrogen and phosphorus removal efficiency.

Due to continued industrialization and urbanization, environmental pollution is becoming more serious day by day, and the shapes of discharged sewage, wastewater, and sewage are also very diverse, and facilities for their treatment are also sophisticated and treatment costs are also increasing. However, as water pollutants in wastewater that have not been completely treated flow into other water sources such as rivers and lakes, many problems arise in efficient water quality management.

In general, in biological sewage and wastewater treatment methods, nitrogen and phosphorus act as essential nutrients for protein and nucleic acid synthesis for the activity and proliferation of microorganisms.

However, when the water contains a large amount of nutrients such as nitrogen and phosphorus, the rapid growth of autotrophic microorganisms such as algae leads to eutrophication, which promotes the growth of algae, which are phytoplankton in the water. which causes water pollution.

Accordingly, an advanced biological treatment process capable of efficiently removing nitrogen and phosphorus has been introduced in sewage treatment.

Methods applied to treat sewage and wastewater include biological methods, chemical methods, physical methods, etc. Among them, representative methods for simultaneously removing nitrogen and phosphorus include A2O (Anaerobic/Anoxic/Oxic) series A2O ,UCT, VIP, DNR, etc., and SBR (continuous batch activated sludge method) series SBR, Omniflo-SBR, ICEAS, CASS, etc.

The A2O series method is an improved method of the A/O method to remove nitrogen. An anoxic tank required for denitrification reaction, an anaerobic tank for phosphorus release, and an aerobic tank for nitrification, phosphorus absorption, and decomposition of organic matter (Aerobic tank), which consists of an internal transfer to remove nitrate nitrogen and a settling tank sludge transfer.

The SBR process is a process in which the inflow of sewage and the outflow of treated water occur in a single reactor, and the reaction proceeds in the order of inflow, reaction, precipitation, discharge, and stop process. The batch method (SBR) method is mainly applied due to environmental aspects, installation space, and maintenance and repair costs.

The methods mentioned above are different in each sewage inflow method or mechanical device, but the nitrogen and phosphorus removal process is similar. A general biological nitrogen removal process is a denitrification reaction that converts organic nitrogen or ammonia nitrogen present in sewage and wastewater into nitrate nitrogen through a nitrification reaction under an aerobic state, and converts the produced nitrate nitrogen into nitrogen gas under an anoxic state. made to perform

In the denitrification reaction, a biosynthetic denitrification method in which a hydrogen donor is added and an endogenous respiration denitrification method using the endogenous respiration of denitrifying microorganisms are used. The biosynthetic denitrification method is divided into a method using organic matter in sewage or wastewater as a hydrogen donor and a method adding chemicals such as methanol and acetic acid.

In addition, the biological phosphorus removal process uses the phenomenon of phosphorus overtake (Luxury Uptake) of Poly-P microorganisms, which are mainly composed of Acinetobacter species included in the activated sludge and capable of excessive phosphorus intake. As the environment in the phosphorus removal reactor repeats anaerobic and aerobic conditions, Poly-P microorganisms become relatively active compared to usual, and phosphorus intake increases accordingly.

That is, the biological phosphorus removal process is to increase phosphorus removal efficiency by removing microorganisms with increased phosphorus content as sludge. For reference, the phosphorus content ratio of general microorganisms in activated sludge is 2-3%, but Poly-P microorganisms are 5-10% higher than this.

On the other hand, the various methods mentioned above effectively remove BOD, COD, and SS, but it is difficult to simultaneously remove nitrogen and phosphorus.

In general, not only when nitrate nitrogen (NOX_N) is released as nitrogen (N2) gas (denitrification), but also when phosphorus-accumulating microorganisms accumulate in the form of poly-β-hydroxybutyric acid (PHB) and release phosphorus, organic matter will be needed As such, organic matter acts as an important factor when removing nitrogen and phosphorus contained in sewage, and it is important to appropriately distribute the limited organic matter to denitrifying microorganisms and phosphorus accumulating microorganisms.

However, when the phosphoaccumulative microorganisms and the denitrifying microorganisms are in competition, the denitrifying microorganisms consume organic matter relatively first compared to the phosphoaccumulative microorganisms, thereby becoming a dominant species. Therefore, it is necessary to supply limited organic matter to phosphate-accumulating microorganisms as early as possible to reduce the interference of toxic substances of nitrate nitrogen. By activating the activity of phosphate-accumulating microorganisms, which are relatively weak compared to denitrifying microorganisms, simultaneous treatment of nitrogen and phosphorus can occur. .

Currently, due to the characteristics of sewage and sewage and wastewater (hereinafter referred to as 'sewage'), the organic matter concentration required to remove nitrogen and phosphorus is low, so it has a disadvantageous property in terms of nutrient removal, and microorganisms necessary for simultaneous nitrogen and phosphorus removal are dominant. There was a problem that it was not suitable as a medium / small scale sewage treatment system due to the lack of a system that could proliferate.

Republic of Korea Patent Registration No. 10-1671491 : Advanced water treatment device for wastewater and advanced water treatment method using the same

The present invention is to solve the above conventional problems, and to provide a sewage treatment system capable of increasing nitrogen and phosphorus removal efficiency.

In addition, the present invention is to provide a sewage treatment system that can efficiently remove nitrogen and phosphorus by using a biofilm filter medium so that the nitrification reaction and the denitrification reaction are partitioned in a reaction tank.

The sewage treatment system of the present invention for achieving the above object includes a flow control tank into which sewage flows; an anaerobic tank in which a dephosphorization reaction is induced in the sewage introduced from the flow control tank; A reaction tank in which aerobic treatment and anoxic treatment are sequentially performed in a state in which the sewage is introduced in the flow control tank, and aerobic treatment, precipitation, and supernatant discharge are sequentially performed in a state in which the sewage in the anaerobic tank is additionally introduced after the anoxic treatment and; a discharge tank into which the supernatant discharged from the reaction tank flows; a sludge storage tank in which surplus sludge discharged from the reaction tank and the discharge tank is stored; an aeration unit for supplying air to the flow control tank, the batch reaction tank, and the sludge storage tank; It is characterized in that it has a supernatant filtering unit installed between the reaction tank and the discharge tank, and filtering the supernatant while mixing the plasma treated water with the supernatant discharged from the reaction tank.

The reaction tank is initially supplied with an amount of sewage corresponding to 80 percent of the volume of the inner space, and aerobic treatment and anoxic treatment are performed, and after the anoxic treatment, from the anaerobic tank to 20 percent of the volume of the inner space of the reaction tank. It is preferable that aerobic treatment is performed again by additionally supplying positive sewage.

The supernatant filtering unit includes a frame, a drum filter having a horizontally extended cylindrical shape and rotatably supported on both sides in the longitudinal direction by rollers mounted on an upper end of the frame and having a plurality of filtering holes, and a second filter extending from the reaction tank. A static mixer having one side connected to the first supernatant discharge pipe and extending into the drum filter at the other side to discharge sewage into the drum filter while stirring the supernatant flowing into the first supernatant discharge pipe, and the drum filter rotatably passing through the top portion and a hopper fixedly mounted on the frame, in which the supernatant filtered by the drum filter is collected at the bottom, and one side of the bottom connected to the second supernatant discharge pipe extending to the discharge tank; An extended circulation pipe, a filter washing pipe extending from the circulation pipe parallel to the drum filter above the drum filter and having a plurality of nozzles installed at the bottom for spraying supernatant water in the direction of the drum filter, and one side of the circulation pipe A circulation pump installed in the circulation pipe for pumping supernatant water introduced into the circulation pipe, a filter driving unit for rotating the drum filter, and a plasma connected to the filter washing pipe or installed between the first supernatant discharge pipe and the static mixer It is desirable to have a generator.

The sewage treatment method of the present invention includes a first reaction tank sewage inflow step of introducing sewage from a flow control tank to a reaction tank having an inner space; an anaerobic tank sewage inflow step of introducing sewage from the flow control tank to the anaerobic tank; In a state in which the inflow of sewage into the reaction tank is stopped, a reaction tank aeration unit for supplying air supplied from a blower to the reaction tank and an agitator installed in the reaction tank are driven to aerate the sewage in the reaction tank, and then the reaction tank aeration unit and the reaction tank aeration unit A first sewage treatment step of anoxic treatment by stopping the agitator; After the anoxic treatment, a second reaction tank sewage inflow step of transferring the sewage in the anaerobic tank to the reaction tank; a second sewage treatment step of aerating sewage in the reaction tank by driving the reaction tank aeration unit and the stirrer in a state in which the flow of sewage into the reaction tank is stopped after the step of introducing sewage into the second reaction tank; After the second sewage treatment step, a reaction tank sludge settling step of stopping the reaction tank aeration unit and the agitator to precipitate the sludge; a supernatant discharge step of discharging supernatant water to the discharge tank after the reaction tank sludge precipitation step; A supernatant filtration step of mixing the plasma treated water with the supernatant discharged from the reaction tank, filtering it, and then discharging it to the discharge tank; It characterized in that it comprises a discharge step of discharging the supernatant introduced into the discharge tank to the outside.

In the sewage treatment system of the present invention, aerobic treatment and anoxic treatment are sequentially preceded by aerobic treatment and anoxic treatment of the sewage introduced from the reaction tank, and after the sewage under anaerobic conditions in the anaerobic tank is additionally supplied to the reaction tank, aerobic treatment, precipitation, and supernatant discharge are sequentially performed to treat sewage It can effectively treat organic matter, nitrogen and phosphorus in water.

In addition, the sewage treatment system of the present invention has a denitrification induction promoting member installed in the anaerobic tank, so that the sewage introduced from the flow control tank and the sludge returned from the reaction tank or discharge tank are mutually agitated and denitrification of the sludge is induced, and denitrification is promoted. There is an advantage that optimal anaerobic conditions can be formed on the outside of the member.

In addition, the sewage treatment system of the present invention mixes the supernatant water discharged from the reaction tank with plasma treated water, filters it, and transfers it to the discharge tank, so that sewage treatment efficiency can be improved.

1 is a diagram of a sewage treatment system according to a first embodiment of the present invention,
2 is a view of a flow rate adjustment tank and an anaerobic tank of the sewage treatment system of FIG. 1;
3 is a view of a reaction tank, a supernatant filtration unit, and a discharge tank of the sewage treatment system of FIG. 1;
Figure 4 is a view of the supernatant water filtration unit of Figure 3,
5 is a schematic block diagram of a sewage treatment process using the sewage treatment system of FIG. 1;
6 is a partial perspective view of the supernatant filtration unit of the sewage treatment system according to the second embodiment of the present invention.

Hereinafter, a sewage treatment system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to Figures 1 to 5. The sewage treatment system according to the first embodiment of the present invention includes a flow control tank 10, a sewage supply unit 13, an anaerobic tank 20, a reaction tank 30, a discharge tank 60, and a sludge storage tank. 80, an aeration unit 100, a supernatant discharge unit 120, a treated water discharge unit 170, and a sludge discharge unit 150.

The flow control tank 10 is a part in which initial sewage is introduced and stored. A first agitator 12 for agitating the sewage is mounted in an elevating manner in the inner space 11 of the flow control tank 10, in which sewage is stored, and the first level sensor LS installed in the inner space of the flow control tank Under the control of the controller 90 that detects the signal, a first transfer pump 14 for transferring sewage to the reaction tank 30 and a second transfer pump 15 for transferring sewage to the anaerobic tank 20 are installed .

On the other hand, the sewage supply unit 13 includes the first and second transfer pumps 14 and 15, the reaction tank connection pipe 16, the first and second anaerobic tank connection pipes 17 and 18, and the third transfer pump (not shown) and an anaerobic treated water supply pipe 19.

The reaction tank connection pipe 16 has one end connected to the first transfer pump 14 between the flow control tank 10 and the reaction tank 30 and the other end extended to the reaction tank 30 so that the flow control tank 10 is connected to the reaction tank 30. ) to form a channel through which sewage flows.

The first anaerobic tank connection pipe 17 is connected to the second transfer pump 15 and extends to the reaction tank connection pipe 16. The second anaerobic tank connecting pipe 18 is an anaerobic tank in the reaction tank connecting pipe 16 between one side of the reaction tank connecting pipe 16 where the first anaerobic tank connecting pipe 17 is installed and the other side of the reaction tank connecting pipe 16 toward the reaction tank 30 (20).

An on-off valve for controlling the transfer of sewage and a check valve for controlling the direction are respectively installed in the reaction tank connection pipe 16 and the second anaerobic tank connection pipe 18.

The first and second transfer pumps 14 and 15, the reaction tank connection pipe 16, and the first and second anaerobic tank connection pipes 17 and 18 are installed in consideration of the inflow and supply of sewage, and are not limited to the number don't

The anaerobic tank 20 has an anaerobic tank inner space 21 capable of storing sewage introduced through the second anaerobic tank connecting pipe 18 is formed. In the anaerobic tank inner space 21, a second agitator 23 capable of agitating the sewage flowing into the anaerobic tank is installed so that the sludge discharged from the reaction tank 30 or the discharge tank 60 can flow in. A sludge transport pipe 159 is formed extending into the anaerobic tank inner space 21. In the anaerobic tank 20, denitrification is induced using phosphorus release and organic matter in sewage.

The anaerobic tank inner space 21 is formed in a quadrangular or polygonal column shape, and a plurality of through spaces are arranged in a lattice form so that each surface communicates with each other therein, and a denitration promoting induction member 25 made of a carbon material is installed. The second anaerobic tank connection pipe 18 and the sludge return pipe 159 are extended to the denitrification acceleration induction member 25, and the sewage introduced from the flow control tank 10 and the returned sludge are mutually stirred and induced, so that the denitrification of the sludge It is performed and an optimal anaerobic condition is formed on the outside of the denitrification acceleration inducing member 20.

For example, when nitrate nitrogen is removed in an amount of 2 to 3 mg/L by maximizing organic matter by denitrification in the anaerobic tank 20, phosphorus can be released up to 40% of the inflow concentration. Denitrification and anaerobic treatment in the anaerobic tank 20 can be performed for 1 to 2 hours, the DO concentration is maintained at 0.2 mg / L or less, the MLSS concentration is maintained at 2,500 to 4,000 mg / L, and the pH is 7 to 7.5 , ORP can be operated while maintaining -150mmV.

In the reaction tank 30 operated in a batch mode, an internal space 31 capable of storing sewage introduced through the reaction tank connecting pipe 16 is formed, and a third agitator 33 capable of stirring the sewage is installed so as to be able to move up and down. And, a supernatant discharge unit 120 for discharging the treated supernatant is installed.

The reaction tank 30 removes organic matters, nitrogen and phosphorus in the sewage using microorganisms, and is configured so that the inflow of sewage and the outflow of treated supernatant occur in a single batch tank, so that each unit process is performed according to the arrangement of a predetermined time. is done successively

In the unit processes performed in the reaction tank 30, the aerobic treatment process and the anoxic treatment process are sequentially performed in a state in which sewage corresponding to 80% of the volume of the inner space 31 of the reaction tank 30 flows in, and then the anaerobic tank ( When 20% of the volume of the inner space 31 of the reaction tank 30 is additionally introduced from 20), an aerobic treatment process, a precipitation process, and a supernatant discharge process are sequentially performed.

In addition, a second level sensor LS, a DO sensor, a PH sensor, and an MLSS sensor may be installed inside the reaction tank 30 . Depending on the measured values of the water level, DO concentration, pH, and MLSS (mixed liquorsuspended solid) concentration measured by these sensors, the inflow of sewage, aeration, and agitation are determined.

The measured values measured by the sensors are input to the control unit 90, and when the water level, DO concentration, pH, and MLSS concentration reach set values, the control unit controls the driving of the transfer unit, aeration unit, and first to third stirrers, The anaerobic treatment process in the anaerobic tank 20, the aerobic treatment process in the reaction tank 30, the anoxic treatment process, the aerobic treatment process, the precipitation process, and the supernatant discharge process are continuously performed. The control unit 90 may include a conventional controller, an input unit, a driving circuit, and a display.

The anaerobic treatment water supply pipe 19 is connected from the anaerobic tank 20 to the reaction tank 30, and a third transfer pump and a valve are installed on one side.

The supernatant discharge unit 120 discharges a part of the supernatant water in the upper part of the reaction tank 30 to the discharge tank 60 while one side rises and falls according to the change in water level in the reaction tank 30 .

The supernatant discharge unit 120 extends vertically in the reaction tank 30 and has a discharge duct 121 having an inner space, and extends from one side of the discharge duct 121 to the side of the inner space 31 of the reaction tank 30, A tube-shaped fixing pipe 123 having a hollow connected to the inner space of the discharge duct 121, and a pivoting pipe 124 installed rotatably up and down at the end of the fixing pipe 123 protruding with respect to the discharge duct 121 ) and a hollow corrugated pipe having flexibility so that it can be transformed into a shape that maintains the connection state of the rotating pipe 124 and the discharge pipe 123 even when the rotating pipe 124 rotates with respect to the fixed pipe 123 (Currugate A connecting pipe 125 composed of a tube or a rubber hose, and a plurality of branches are installed from the end of the rotating pipe 124 in both directions crossing the longitudinal direction of the rotating pipe 124, and the upper water in the reaction tank 30 By providing buoyancy to the branch inlet pipe 126 formed so that the inlet pipe 126 can flow into the branch inlet pipe 126, the rotary pipe 124 is rotated according to the water level in the reaction tank 30, and the end of the branch inlet pipe 126 is rotated. A buoyancy body 128 installed in the branch inlet pipe 640 to be moved up and down, and a discharge pump 129 installed in the discharge duct 128 to pump supernatant water introduced into the discharge duct 128 to the outside of the reaction tank 30 ) is provided.

The branch inlet pipe 126 is formed in a hollow tubular shape, and an inlet through which supernatant water can flow is formed at each end in the longitudinal direction or at one upper side. A shut-off valve whose operation is controlled by the control unit 90 may be further provided at the portion where the inlet of the branch inlet pipe 126 is formed to block the inflow of the supernatant into the branch inlet pipe 126 .

The buoyancy body 128 includes a buoyancy tube having a buoyancy space formed therein, and a guide protrusion 129 connecting the buoyancy tube to the branch inlet pipe 126 and guiding rotation with respect to the branch inlet pipe 126. The buoyancy cylinder is made of a cylindrical cylinder shape having a predetermined thickness. The buoyancy cylinder may be a hollow cylinder or may be filled with a foamed resin such as Styrofoam.

And, the supernatant discharge unit 120 is installed at the end of the first supernatant discharge pipe 130 extending from the discharge duct 121 and the first supernatant discharge pipe 130 to discharge the supernatant discharged to the first supernatant discharge pipe 130 A supernatant filtering unit 131 for filtering and a second supernatant discharge pipe 147 extending from the supernatant filtering unit 131 to the discharge tank 60 are provided.

The supernatant filtration unit 131 includes a frame 132, a drum filter 133, a static mixer 136, a hopper 137, a circulation pipe 138, a filter washing pipe 134, and a circulation pump. 139, a filter driving unit 140, and a plasma generator (not shown).

The drum filter 133 has a horizontally extended cylindrical shape, and both sides in the longitudinal direction are rotatably supported by rollers 145 mounted on the top of the frame, and a plurality of filtering holes are provided on the side located in the hopper 137. is formed A plurality of filter holes may be formed to have a diameter smaller than that shown, and a filter fabric in the form of a fabric may be further attached to the outer or inner circumferential surface of the drum filter 133 .

The static mixer 136 has one side connected to the first supernatant discharge pipe 130 and the other side extending into the drum filter 133, and discharging the supernatant introduced into the first supernatant discharge pipe 130 into the drum filter 133 while agitating the supernatant. do.

In the hopper 137, the drum filter 133 is rotatably penetrated at the top and fixedly mounted on the frame 132, and the supernatant filtered by the drum filter 133 is collected at the bottom, and one side of the bottom is a second supernatant discharge pipe ( 147) is connected.

The circulation pipe 138 extends from the lower side of the hopper 137 to the upper side of the drum filter 133.

The filter washing pipe 134 extends parallel to the drum filter 133 from the circulation pipe 138 upward to the drum filter 133, and a plurality of nozzles 135 spraying treated water in the direction of the drum filter 133 at the bottom. ) is installed.

The circulation pump 139 is installed on one side of the circulation pipe 138 to pump supernatant water introduced into the circulation pipe 138.

The filter driving unit 140 is for rotating the drum filter 133, and includes a first gear unit 143 extending along the circumferential direction on the outer circumferential surface of the drum filter 133 protruding outward of the hopper, and a frame 132. A drum drive motor 141 mounted so that the drive shaft 142 is connected to any one roller 145, and formed along the circumferential direction of the outer circumferential side of the roller 132 connected to the drive shaft 142 to form a first gear unit and A second gear part 144 meshed with it is provided.

The plasma generator may be installed on one side of the circulation pipe 139 or on one side of the filter cleaning pipe 134, but is preferably installed between the first supernatant discharge pipe 130 and the static mixer 136. Alternatively, the plasma generator may be accommodated in the lower part of the hopper 137 located below the drum filter 133.

The plasma generator is a high voltage discharger that generates ozone or the like for sewage treatment, and is not particularly limited and may include all known to those skilled in the art. For example, various plasma generators and their respective components and descriptions described in Korean Patent Registration No. 10-1233568 may be applied in the same or similar manner to the present invention.

For example, although not shown, the plasma generator includes a cylindrical tube with both ends open and made of a dielectric material; a support coupled to one side of the cylindrical tube; Internal electrodes penetrating the support and positioned inside the cylindrical tube; a coil-type external electrode penetrating the support and surrounding the outside of the cylindrical tube; It may also have a structure having a coiled electrode including; and an air delivery tube for delivering air to the inside of the cylindrical tube.

The supernatant discharged from the reaction tank 30 is introduced into the discharge tank 60 by the supernatant discharge unit 120 .

The supernatant, that is, the treated water flowing into the discharge tank 60 is finally discharged to the outside after staying for a certain period of time. To discharge the treated water to the outside of the discharge tank 60, the discharge tank 60 is connected to the treated water discharge unit 170. In addition, although not shown, a third level sensor may be installed in the discharge tank 60.

In the discharge tank 60, a chemical input facility and a submerged separator 64 may be additionally installed to increase phosphorus treatment efficiency and organic material treatment efficiency.

Based on the measured value from the third level sensor, the control unit controls the driving of the treated water discharge unit 170 to be described later to discharge the treated water to the outside.

The sludge storage tank 80 is a part where the sludge precipitated in the reaction tank 30 and the discharge tank 60 is transported and stored. The sludge storage tank 80 is for storing the sludge generated in the sewage treatment process for a certain period of time in the case of a small-scale sewage treatment facility and then transporting it to a nearby sewage treatment plant by using a vehicle. It is a facility for storage and concentration prior to dehydration.

The sludge storage tank 80 is connected to the reaction tank 30 and the discharge tank 60 by the sludge discharge unit 150, and a fourth level sensor may be installed therein.

The aeration unit 100 includes at least one blower 101 and a reaction tank aeration unit that supplies air supplied from the blower 101 to the reaction tank 30 to induce a nitrification reaction of sewage in the reaction tank and removal of BOD and COD. 102, a discharge tank aeration unit 111 for supplying air supplied from the blower 101 to the discharge tank 60, and a sludge storage tank for supplying air supplied from the blower 101 to the sludge storage tank 80 An aeration part 116 is provided.

The reaction tank aeration unit 102 has a first air supply pipe 103 having one side connected to the blower 51 and the other side extending to the lower part of the reaction tank 30, and installed on one side of the first air supply pipe 103 to control the control unit 90. ) A first air supply valve that opens and closes the first air supply pipe 103 according to the control is installed. A plurality of first injection nozzles 104 spaced apart at predetermined intervals are installed in the first air supply pipe 103 so that the oxygen supplied therein can be injected to the lower part of the reaction tank 30 .

The discharge tank aeration unit 111 has a second air supply pipe 112 having one side connected to the blower 51 and the other side extending into the inner space of the discharge tank, and installed on one side of the second air supply pipe 112 to provide a second air supply pipe 112. A second air supply valve for opening and closing the air supply pipe 112 is provided. And, the end of the second air supply pipe extends to the submerged separator 64, and at least one second injection nozzle (not shown) may be installed.

The sludge storage tank aerator 116 has a third air supply pipe 117 having one side connected to the blower 51 and the other side extending into the internal space of the sludge storage tank, and installed on one side of the third air supply pipe 117 to A third air supply valve for opening and closing the third air supply pipe 117 is provided. And, at least one third injection nozzle 118 is installed at the end of the third air supply pipe.

The sludge discharge unit 150 transfers the sludge in the reaction tank 30 or the discharge tank 60 to the sludge storage tank 40 or to the anaerobic tank 20.

The sludge discharge unit 150 includes a first sludge discharge pipe 151 extending from the bottom of the reaction tank 30 to the outside, a second sludge discharge pipe 154 extending from the bottom of the discharge tank 60 to the outside, and a sludge storage tank A third sludge discharge pipe 157 extending outward from 80 and connected to the first and second sludge discharges 151 and 154, and a sludge return pipe branching from the third sludge discharge pipe 157 and extending into the anaerobic tank 20 159, a first sludge transfer pump 161 installed on one side of the first sludge discharge pipe 151 and pumping the sludge in the reaction tank 30 to the sludge storage tank 80 or conveying it to the anaerobic tank 20, and the second A second sludge transfer pump 163 installed on one side of the sludge discharge pipe 154 pumps the sludge in the discharge tank 60 to the sludge storage tank 80 or returns it to the anaerobic tank 20.

Each side of the first to third sludge discharge pipes 151, 154, and 157 and the sludge conveying pipe 159 is controlled by a control unit to control the opening and closing of the first to third sludge discharge pipes 151, 154, 157 or the sludge conveying pipe 159 Valves 164, 165, 166 and 167 are respectively installed.

In addition, a check valve is installed in the third sludge discharge pipe 147 so that the sludge flows in the direction of the sludge storage tank 80 or the anaerobic tank 20

The treated water discharge unit 170 includes a first treated water discharge unit 171 and a second treated water discharge unit 176 .

The first treated water discharge unit 171 is connected to the submerged separation membrane 64 and extends to the outside of the discharge tank 60 to form a discharge passage through which the treated water passing through the submerged separation membrane 64 flows out. The first treated water discharge pump is installed on one side of the first treated water discharge pipe 172 and the first treated water discharge pipe 171 and pumps the treated water that has passed through the submerged separation membrane 64 to be discharged to the outside under the control of the control unit. 173 and a first discharge pipe opening/closing valve 174 for opening and closing the first treated water discharge pipe 172 under the control of the controller.

When the second treated water discharge unit 176 cannot filter the treated water because the submerged separation membrane 64 is blocked and cannot be discharged to the outside through the first treated water discharge unit 171, the second treated water discharge unit 176 is controlled by the control unit. The treated water flowing into the discharge tank 80 from the supernatant filtration unit 130 during the time is discharged to the outside under the control of the control unit.

The second treated water discharge unit 176 is installed through the outside of the discharge tank 60 to form a flow path through which the treated water can be discharged to the outside for a set time, and the second treated water discharge pipe 177, the second treatment A second treated water discharge pump 178 installed on one side of the water discharge pipe 177 to pump treated water to be moved to the outside through the second treated water discharge pipe 177, and a second treated water discharge pipe under the control of the control unit ( 177) is provided with a second discharge pipe opening/closing valve 179 that opens and closes.

Although not shown, the control unit controls the first and second transfer pumps 14 and 15 by receiving signals from the first level sensor LS installed in the flow control tank and the second level sensor LS installed in the reaction tank to obtain an anaerobic tank ( 20) and the reaction tank 30, control the inflow of sewage, and control the opening and closing of the valves installed in the aeration unit 100 to control the air supply to the anaerobic tank 20, the reaction tank 30, and the sludge storage tank 80.

When the submerged separator 64 is blocked, the water level in the discharge tank 60 increases or the flow of treated water in the submerged separator 64 stops.

The control unit detects the second and third level sensors and a flow sensor (not shown) installed in the submerged membrane 64 or the first treated water discharge pipe 172 to drive the second treated water discharge pump 178. let it,

The second discharge pipe opening/closing valve 179 is opened so that the treated water is discharged through the second treated water discharge unit 176 for a set period of time, and the second treated water discharge pump 178 is operated.

On the other hand, the anaerobic tank 20, the reaction tank 30, the discharge tank 60, the sludge storage tank 80, and the flow control tank 10 may be composed of FRP (Fiber Reinforced plastics) or concrete structures, and if sewage can be stored Not limited.

Now, a sewage treatment method using the sewage treatment system according to an embodiment of the present invention having the configuration described above will be described.

A sewage treatment method using a sewage treatment system according to an embodiment of the present invention includes a first reactor sewage inflow step of introducing sewage from a flow control tank 10 to a reaction tank 30; An anaerobic tank sewage inflow step of introducing sewage from the flow control tank 10 into the anaerobic tank 20; In a state where the inflow of sewage is stopped, the reaction tank aerator 102 and the third agitator 33 are driven to aerate the sewage in the reaction tank 30, and then the reaction tank aerator 102 and the third agitator 33 are A first sewage treatment step of anaerobic treatment; After the anoxic treatment, a second reaction tank sewage inflow step of transferring the sewage in the anaerobic tank to the reaction tank; A second sewage treatment step of aerating sewage in the reaction tank 30 by driving the reaction tank aeration unit 102 and the third agitator 33 in a state where the inflow of sewage is stopped after the second reaction tank sewage hydraulic pressure step; After the second sewage treatment step, the reaction tank aeration unit 102 and the third agitator 33 are stopped to precipitate the sludge, and after the reaction tank sludge precipitation step, the supernatant water discharge unit 120 A supernatant discharge step of discharging the supernatant to the discharge tank 60, a supernatant filtration step of mixing and filtering the supernatant discharged from the reaction tank with plasma-treated water, and then discharging the supernatant into the discharge tank; 2 includes a discharge step of discharging the treated water to the outside through the discharge pipes 172 and 177.

In the first reaction tank sewage inflow step, sewage is supplied so that only 80% of the volume of the inner space 31 of the reaction tank 30 is filled, and in the anaerobic tank sewage inflow step, the sewage flows into the anaerobic tank 20 The inner space 31 of the reaction tank 30 ) is supplied only in an amount corresponding to 20% of the volume.

In the first sewage treatment step, the reaction tank aerator 102 and the third agitator are driven to supply air into the reaction tank to form aerobic conditions, thereby inducing oxidation of organic matter, nitrification of nitrogen, and excessive intake of phosphorus. and an anoxic treatment step of removing nitrate nitrogen by stopping the reactor aeration unit 102 so that an acid-free condition is formed.

In the first reaction tank sewage inflow step, sewage is supplied so that only 80% of the volume of the inner space 31 of the reaction tank 30 is filled for 1 hour, and in the first aerobic treatment step, aerobic conditions are formed for 3 hours, anoxic treatment step It is preferable to form an anoxic condition for 1 hour.

When the anoxic treatment step is completed, in the second reaction tank sewage inflow step, an amount of sewage corresponding to 20% of the volume of the inner space 31 of the reaction tank 30 is transferred from the anaerobic tank 20 to the reaction tank 30.

In the second sewage treatment step, the reaction tank aeration unit 102 is driven to have aerobic conditions for 2 hours. Through the second sewage treatment step, removal of residual organic matter and nitrification can be effectively performed.

And, in the sedimentation step, the supply of sewage is stopped, and the operation of the reaction tank aerator 102 and the third agitator 32 is stopped, and the sludge is settled by gravity and separated into solid-liquid.

In the supernatant filtration step, the supernatant water discharged from the reaction tank 30 is supplied to the supernatant filtration unit 130 and stirred with the plasma treated water by a static mixer, and the mixed water of sewage and plasma treated water is mixed with the drum filter 133 in the static mixer. ) and filtered, and then discharged to the lower part of the hopper 137.

In the sewage treatment system and the sewage treatment method using the same according to an embodiment of the present invention, aerobic treatment and anoxic treatment are sequentially preceded in the sewage introduced from the reaction tank, and sewage under anaerobic conditions in the anaerobic tank is additionally supplied to the reaction tank, and then the sewage In the state where the inflow is stopped, aerobic treatment, precipitation, and supernatant discharge proceed sequentially, so that organic matter, nitrogen and phosphorus in the sewage can be effectively treated.

In addition, in the sewage treatment system and the sewage treatment method using the same according to an embodiment of the present invention, a dedusting induction promoting member is installed in the anaerobic tank, so that the sewage introduced from the flow control tank and the sludge returned from the reaction tank or discharge tank are mutually stirred and induced , denitrification of sludge is induced, and there is an advantage that optimal anaerobic conditions can be formed outside the denitrification acceleration inducing member.

In addition, since the sewage treatment system and the sewage treatment method using the same according to an embodiment of the present invention mix the supernatant water discharged from the reaction tank with the plasma treated water, filter it, and transfer it to the discharge tank, the sewage treatment efficiency can be improved.

Meanwhile, FIG. 6 shows a part of the supernatant filtration unit 230 of the sewage treatment system according to the second embodiment of the present invention.

In the supernatant water filtration unit 230 according to the second embodiment of the present invention, the plasma generator is installed on one side of the circulation pipe 139 or one side of the filter washing pipe 134, and the plasma treated water is supplied to the filter washing pipe 134. and a plasma-treated water supply pipe 245 extending from the filter washing pipe 134 to the static mixer 136.

The static mixer 136 is not limited to the illustrated structure, but one side is connected to the first supernatant discharge pipe and is formed in a tubular shape, and the other side extends into the drum filter and is connected to the plasma treated water supply pipe 245. 236, and a helicut member 240 accommodated in the mixer housing 236. The helicut member 240 includes a coupling ring 241 coupled to the flange 237 of the mixer housing 236, and a helical formed on the coupling ring 241 to be inserted into the housing 236 and twisted in a spiral shape. A body 243 is provided. The coupling ring 241 is located between the flange 130a of the first supernatant discharge pipe 130 and the flange 237 of the mixer housing 236. The coupling ring 241 is formed with a plurality of through-holes so that bolts can pass therethrough. A support bar 242 for supporting the helical body 243 is formed inside the coupling ring 241 .

Therefore, the supernatant water passing through the mixer housing 236 and the plasma treated water supplied from the plasma treated water supply pipe 245 pass through the helical body 242 while forming a helical vortex flow and are rapidly mixed.

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In the above, the present invention has been described with reference to one embodiment, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom.

10: flow control tank 20: anaerobic tank
30: reaction tank 60: discharge tank
80: sludge storage tank 100: aeration unit
120: supernatant discharge unit 131: supernatant filtration unit
150: sludge discharge unit 170: treated water discharge unit

Claims (8)

a flow control tank into which sewage flows;
an anaerobic tank in which a dephosphorization reaction is induced in the sewage introduced from the flow control tank;
A reaction tank in which aerobic treatment and anoxic treatment are sequentially performed in a state in which the sewage is introduced in the flow control tank, and aerobic treatment, precipitation, and supernatant discharge are sequentially performed in a state in which the sewage in the anaerobic tank is additionally introduced after the anoxic treatment and;
A discharge tank in which the supernatant discharged from the reaction tank flows into the inside and is equipped with a submerged separator for treating phosphorus and organic substances;
a sludge storage tank in which surplus sludge discharged from the reaction tank and the discharge tank is stored;
an aeration unit for supplying air to the flow control tank, the reaction tank, and the sludge storage tank;
a supernatant water discharging unit which discharges a part of the supernatant water in the upper part of the reaction tank toward the discharging tank while one side thereof rises and falls according to the change in the water level in the reaction tank;
a supernatant filtering unit installed between the reaction tank and the discharge tank to mix and filter the supernatant water discharged from the reaction tank with plasma-treated water;
A reaction tank connection pipe connected to the first transfer pump installed in the flow control tank and extending to the reaction tank, and a first anaerobic tank connection pipe connected to the second transfer pump installed in the flow control tank and extending to one side of the reaction tank connection pipe, A sewage supply unit including a second anaerobic tank connecting pipe extending from the reaction tank connecting pipe between the first anaerobic tank connecting pipe and the reaction tank to the anaerobic tank, and an anaerobic treated water supply pipe connected from the anaerobic tank to the reaction tank; and
It is accommodated in the anaerobic tank and is formed in the shape of a square or polygonal column, but a plurality of through spaces are arranged in a lattice form so that each side is in communication with the inside and is formed of a carbon material, and the sludge flows into the interior discharged from the reaction tank or the discharge tank And a denitrification promotion guide member connected to the sludge return pipe extending into the anaerobic tank and the second anaerobic tank connection pipe to mutually agitate and induce the sewage introduced from the flow control tank and the sludge returned from the sludge return pipe; Further comprising,
The supernatant filtration unit
frame; a drum filter having a horizontally extended cylindrical shape, rotatably supported on both sides in the longitudinal direction by rollers mounted on an upper end of the frame, and having a plurality of filtering holes; A static mixer having one side connected to the first supernatant discharge pipe extending from the reaction tank and extending into the drum filter at the other side to discharge sewage into the drum filter while stirring the supernatant flowing into the first supernatant discharge pipe; a hopper through which the drum filter rotatably penetrates and is fixedly mounted on the frame, collects the supernatant filtered by the drum filter at the bottom, and is connected to a second supernatant discharge pipe extending to the discharge tank; a circulation pipe extending from the lower side of the hopper to the upper side of the drum filter; a filter washing pipe extending parallel to the drum filter from the circulation pipe upward to the drum filter and having a plurality of nozzles mounted at the lower portion for spraying supernatant water toward the drum filter; a circulation pump installed on one side of the circulation pipe to pump supernatant water introduced into the circulation pipe; a filter driver for rotating the drum filter; A plasma generator connected to the filter washing pipe, installed between the first supernatant discharge pipe and the static mixer, or installed in the hopper to be positioned below the drum filter;
The plasma generator is installed on one side of the filter washing pipe,
The supernatant water filtration unit further includes a plasma treated water supply pipe extending from the filter washing pipe to the static mixer and supplying the plasma treated water generated in the plasma generator to the static mixer,
The static mixer includes a mixer housing having one side connected to the first supernatant discharge pipe, formed in a tubular shape, and the other side extending into the drum filter and connected to the plasma treated water supply pipe, and a helicut member accommodated in the mixer housing. do,
The helicut member includes a coupling ring positioned between the flange of the first supernatant discharge pipe and the flange of the mixer housing, and a helical body supported by the coupling ring and inserted into the mixer housing and twisted in a spiral shape, ,
Controlling the first and second transfer pumps by receiving signals from the first level sensor installed in the flow control tank and the second level sensor installed in the reaction tank to control the inflow of sewage into the anaerobic tank and the reaction tank, and installed in the aeration unit Further comprising a control unit for controlling the opening and closing of valves to control the amount of air supplied to the anaerobic tank, the reaction tank, and the slurry storage tank,
A first treated water discharge pipe connected to the submerged separation membrane and extending to the outside of the discharge tank to form a discharge passage through which the treated water passing through the submerged separation membrane can flow out, and is installed on one side of the first treated water discharge pipe, A first treated water discharge pump that pumps the treated water that has passed through the submerged separation membrane under the control of the control unit to be discharged to the outside, and a first discharge pipe opening and closing valve that opens and closes the first treated water discharge pipe according to the control of the control unit. a first treated water discharge unit;
A second treated water discharge pipe installed through the outside of the discharge tank to form a passage through which treated water can be discharged to the outside for a set time, and installed on one side of the second treated water discharge pipe to discharge treated water to the second treated water discharge pipe. A second treated water discharge unit including a second treated water discharge pump that pumps to be moved to the outside through a second treated water discharge pump and a second discharge pipe opening/closing valve that opens and closes the second treated water discharge pipe under the control of the control unit; and ,
When the control unit detects clogging of the submerged separation membrane through the flow sensor installed in the submerged separation membrane or the first treated water discharge pipe, the control unit opens and closes the second discharge pipe opening/closing valve so that the treated water is discharged through the second treated water discharge unit for a set time. The sewage treatment system, characterized in that by opening and controlling the second treated water discharge pump to be driven. According to claim 1,
Initially, an amount of sewage corresponding to 80 percent of the volume of the internal space is supplied to the reactor, and aerobic treatment and anoxic treatment are performed,
After the anoxic treatment, aerobic treatment is performed again by additionally supplying sewage in an amount corresponding to 20 percent of the volume of the inner space of the reaction tank from the anaerobic tank. delete delete delete delete delete delete

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