KR102564929B1 - Zero discharge treatment system for high concentration abandonment waste water - Google Patents

Abstract

Disclosed is a non-discharge treatment system for organic wastewater. The organic wastewater non-discharge treatment system includes an anoxic tank and an aeration tank having an open top and receiving sludge treated water filtered from organic wastewater, and a microbial treatment device for treating the stored sludge treated water with microorganisms, and microorganisms treated in the microbial treatment device A flat membrane filter for filtering fine solids from treated water and mist spray provided on the open anoxic tank and aeration tank, and spraying the filtered water filtered by the flat membrane filter as ultra-fine water particles at high pressure onto the open anoxic tank and aeration tank to evaporate contains an evaporator.

Description

Zero discharge treatment system for high concentration abandonment waste water}

The present invention relates to a non-discharge treatment system capable of evaporating and removing high-concentration organic wastewater, such as pig manure, food separation liquid, and landfill leachate, which are difficult to biologically treat, without being discharged.

It is very difficult to treat high-concentration organic wastewater such as pig farming wastewater with general wastewater treatment methods such as chemical flocculation treatment and biological treatment due to carbonates and volatile fatty acids present in the wastewater, viscosity, and toxicity. As a result, in Korea, after the primary treatment at pig farms, small amounts of water are introduced into large-scale treatment plants such as sewage treatment plants and communal treatment plants, or they have been heavily dependent on ocean dumping.

After the eradication of marine dumping, the government has installed joint treatment plants in each region of the country to treat composting and liquefaction, but there are significant problems in reality.

Due to the strong odor of pig manure, the public treatment plant that handles it is an avoidance facility, and there are considerable complaints from nearby residents, making it difficult to obtain permission itself.

If the liquefied fertilizer is not sufficiently ripe, the nitrogen contained in pig manure in a large amount deteriorates in the soil and generates nitrogen gas from the roots and soil of crops, thereby reducing crop growth.

There is serious friction with farmers who use liquid fertilizer because the joint treatment plant does not properly allocate specialized personnel or analyze liquid fertilizer components, and the production of products is not uniform.

Even if liquefied manure is produced in the common treatment plant, due to limitations in the use of liquefied manure by season (summer rain season, winter season, after crop sowing), the liquefied manure produced cannot be sprayed for nearly half of the year and must be stored in a storage tank in the common treatment plant. It is necessary to store and maintain liquid manure for more than 6 months, but at this time, there are many problems in the treatment of pig farming wastewater because the pig farming wastewater is not collected. Organic wastewater from general pig farms that did not flow into the common treatment plant is self-purified by installing a self-purification treatment facility, but it does not meet the discharge water quality standards of the Ministry of Environment.

When wastewater that is not treated below the water quality discharge standard by general farmhouses and self-purification facilities, or liquid fertilizer that is not sufficiently fermented in public treatment plants flows into streams or rivers, it becomes the main cause of water pollution such as green algae and deteriorates the water quality environment.

An object of the present invention is to solve the above problems, and to provide a system for non-discharge treatment of high-concentration organic wastewater capable of preventing environmental pollution.

Another object of the present invention is to provide a non-discharge treatment system for high-concentration organic wastewater that can reduce operating costs by maximizing the reaction between wastewater and chemicals in the treatment of high-concentration organic wastewater.

To achieve the object of the present invention, a non-discharge treatment system for organic wastewater is provided. The organic wastewater non-discharge treatment system includes an anoxic tank and an aeration tank having an open top and receiving sludge treated water filtered from organic wastewater, and a microbial treatment device for treating the stored sludge treated water with microorganisms, and microorganisms treated in the microbial treatment device A flat membrane filter for filtering fine solids from treated water and mist spray provided on the open anoxic tank and aeration tank, and spraying the filtered water filtered by the flat membrane filter as ultra-fine water particles at high pressure onto the open anoxic tank and aeration tank to evaporate contains an evaporator.

The mist spray evaporator may include a mist spray nozzle and a pump supplying the filtered water to the mist spray nozzle at high pressure.

The mist mist evaporator may include a temperature sensor for measuring temperature, a valve provided between the pump and the mist spray nozzle, and a control unit for controlling the valve according to the temperature.

The controller may intermittently operate the fog mist evaporator.

The mist mist evaporator may include a blowing fan for discharging air between the microorganism processor and the mist mist nozzle.

The non-discharge treatment system for organic wastewater according to an embodiment of the present invention removes the sludge of the organic wastewater, microbially decomposes the organic matter, and then evaporates the treated water separated from the sludge and the organic matter into the river, but evaporates it in the form of a mist spray. Non-discharge treatment is possible by discharging into the middle. As a result, the non-discharge treatment system of high-concentration organic wastewater of the present invention can drastically reduce drug costs, operating costs, and facility costs, and can withstand load fluctuations according to pig manure characteristics generated from seasons, washing water, and livestock species (pilets, sows, and fattening pigs). It can be stably processed, blocks the risk of disease spread due to pig manure collection and movement, and reduces civil complaints due to odor.

In addition, the non-discharge treatment system of high-concentration organic wastewater is a self-purification treatment facility, and the final treated water is taken out to the outside to fundamentally block causes such as groundwater contamination, green algae, and red tides, thereby dramatically reducing the load of water pollution throughout Korea. As a result, livestock farmers may not be subject to the total water quality system.

In addition, the non-discharge treatment system of high-concentration organic wastewater can remove the evaporation of the filtered water and remove or prevent the diffusion of odors generated in the microbial treatment machine by performing mist spray evaporation on the microbial treatment machine, that is, the anoxic tank and the aeration tank.

1 is a block diagram showing a high-concentration organic wastewater non-discharge treatment system according to an embodiment of the present invention.
2 is a view showing the detailed configuration of a mist mist evaporator according to an embodiment of the present invention.
3 is a view showing the detailed configuration of a mist mist evaporator according to another embodiment of the present invention.
4 is a view showing a second mist spray evaporation unit for removing the smell of the organic wastewater pretreatment unit according to an embodiment of the present invention.
5 is a flow chart showing a non-discharge treatment method for high-concentration organic wastewater according to an embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that this is not intended to limit the present invention to the specific embodiments, and includes various modifications, equivalents, and/or alternatives of the embodiments of the present invention. In connection with the description of the drawings, like reference numerals may be used for like elements. In the drawings, the same reference numerals or symbols refer to components performing substantially the same function, and the size of each component in the drawings may be exaggerated for clarity and convenience of description. In describing the present invention, if it is determined that a detailed description of a known technology or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

In this document, expressions such as "has," "may have," "includes," or "may include" indicate the existence of a corresponding feature (eg, numerical value, function, operation, or component such as a part). , which does not preclude the existence of additional features.

In this document, expressions such as “A or B,” “at least one of A and/and B,” or “one or more of A or/and B” may include all possible combinations of the items listed together. . For example, “A or B,” “at least one of A and B,” or “at least one of A or B” (1) includes at least one A, (2) includes at least one B, Or (3) may refer to all cases including at least one A and at least one B.

In the embodiments of the present invention, terms including ordinal numbers such as first and second are used only for the purpose of distinguishing one component from another, and expressions in the singular number are plural unless the context clearly indicates otherwise. contains an expression of

In addition, in an embodiment of the present invention, terms such as 'upper', 'lower', 'left', 'right', 'inner', 'outer', 'inner', 'outer', 'front', 'rear' Is defined based on the drawings, and thereby the shape or location of each component is not limited.

As used in this document, the expression "configured to" means "suitable for," "having the capacity to," depending on the circumstances. ," "designed to," "adapted to," "made to," or "capable of." The term "configured (or set) to" may not necessarily mean only "specifically designed to" hardware. Instead, in some contexts, the phrase "device configured to" may mean that the device is "capable of" in conjunction with other devices or components.

1 is a block diagram showing a high-concentration organic wastewater non-discharge treatment system 1 according to an embodiment of the present invention. High-concentration organic wastewater may be livestock wastewater such as but not limited to pig wastewater.

Referring to FIG. 1 , the high-concentration organic wastewater non-discharge treatment system 1 includes an organic wastewater pre-processing unit 10 and an organic wastewater post-processing unit 20 .

The organic wastewater pretreatment unit 10 includes a physicochemical pretreatment unit 11, a microorganism treatment unit 12, and a flat membrane filter 13.

The physicochemical preprocessor 11 can separate solid and liquid organic wastewater through oxidation, neutralization, and coagulation reactions. The physicochemical preprocessor 11 includes a raw water storage tank 111, a reaction tank 112, a coagulation tank 113, a solid-liquid separator 114, and a solid-liquid separation treatment tank 115.

The raw water storage tank 111 stores organic wastewater to be purified.

The reaction tank 112 may cause oxidation and neutralization of organic wastewater by using treatment chemicals.

The coagulation tank 113 may perform a coagulation treatment by adding a coagulant to the reactants neutralized in the reaction tank 112 .

The solid-liquid separator 114 may perform solid-liquid separation of the coagulated reactant through a filter press. The solid-liquid separated treated water is treated with microorganisms to remove more than 90% of volatile fatty acids, fats, viscosity, and pathogenic microorganisms that are difficult to decompose, 80-90% of organic matter (BOD, COD), and 99.9% of suspended sludge (SS). As a result, the period of subsequent microbial treatment can be shortened. The sludge separated by solid-liquid separation is supplied to the compost stage 30 and recycled as a raw material for organic fertilizer, and can be used as a raw material for recycling livestock manure into solid fuel as announced by the Ministry of Environment in 2018.

The solid-liquid separation treatment tank 115 may store treated water obtained by filtering sludge in the solid-liquid separator 114 .

The microbial treatment unit 12 performs biological treatment using a Modified Ludzack Ettinger (MLE) method to treat nitrogen and phosphorus in treated water obtained by filtering sludge from organic wastewater.

The microbial treatment unit 12 may be alternately placed in anoxic tanks 1-2 (121, 123) where combined oxygen is present and aeration tanks 1-2 (122, 124) which supply oxygen. The microbial treatment unit 12 may further include an anaerobic tank without oxygen at all. The microbial treatment period takes about 15 days in total, 10 days in an aeration tank and 5 days in an anaerobic tank. In this way, the treated water treated with microorganisms can meet the livestock manure purification water quality standards. The microbial treatment unit 12 may be composed of internal recycle (Nitrified recycle) for removing nitrate nitrogen and sedimentation pond sludge recycle.

The flat membrane filter 13 may be installed, for example, in the aeration tank 2 (124) provided at the final stage of the microorganism treatment device 12. The flat membrane filter 13 may filter fine solids contained in the microbially treated water in order to prevent the fog spray nozzle (226 in FIG. 2) of the organic wastewater post-treatment unit 20 from being clogged. The flat membrane filter 13 may include a ceramic flat membrane made of ceramic. The ceramic flat membrane has a semi-permanent period of use as the material is made of ceramic, and the filtered water can remove solids with a size of 0.1㎛, which hardly detects sludge. In addition, the ceramic flat membrane can automatically perform backwashing when the operating pressure rises above the set value.

The organic wastewater post-treatment unit 20 includes a treatment water tank 21 and a mist mist evaporator 22.

The treated water tank 21 stores the filtered water filtered through the flat membrane filter 13 of the organic wastewater pretreatment unit 10 .

The mist mist evaporator 22 transfers the filtrate filtered through the flat membrane into the evaporation chamber at a predetermined temperature, for example, 28° C. or higher, preferably 35-40° C., and a predetermined humidity, for example, 75% or lower, in an atmosphere of 5 μm. Evaporation and cooling are instantaneously performed by spraying the following ultra-fine water particles at a high pressure of, for example, 60 cc per minute.

Figure 2 is a view showing the detailed configuration of the mist mist evaporator 22 according to an embodiment of the present invention.

The mist mist evaporator 22 includes a water quality sensor 221, a pump 222, a three-way valve 223, a filter 224, an evaporation chamber 225, a mist spray nozzle 226, an air supply plate 227, an internal Temperature sensor 228-1, internal humidity sensor 228-2, external temperature sensor 229-1, external humidity sensor 229-2, control unit 230, plasma discharger 231, deodorizer 232 ), and an exhaust fan 234. Some of the above configurations may be excluded.

The water quality sensor 221 is installed in the treated water tank 21 that stores the filtered water filtered through the flat membrane filter 13. The water quality sensor 221 finally checks the water quality in order to prevent contamination of the air discharged into the air by mist, mist, evaporation. The water quality sensor 221 includes a hydrogen ion concentration (pH) sensor, an oxidation reduction potential (ORP) sensor, an electrical conductivity (EC) sensor, a dissolved oxygen (DO) sensor, an ion (ISE) sensor, and a chemical/biological (COD/BOD) sensor. Sensor, ammonia nitrogen (NH ₄ N) sensor, nitrate nitrogen (NO ₃ N) sensor, turbidity sensor, suspended solids sensor, water quality transparency sensor, optical dissolved sensor, blue-green algae sensor, chlorophyll It may include at least one of (chlorophyll) sensors.

The water quality sensor 221 is pH (hydrogen ion concentration index), ORP (oxidation reduction potential), Dissolved oxygen (dissolved oxygen), Conductivity (TDS (Total Dissolved solid), Salinity (salinity)), Turbidity (turbidity), suspended solid (TSS (Total Suspended Solids), MLSS (Mixed Liquor Suspended Solids)), COD (Chemical Oxygen Demand), BOD (Biological Oxygen Demand), TOC (Total Organic Carbon), blue-green algae (blue-green algae), chlorophyll (chlorophyll), ammonia nitrogen (NH3-N, ammonia nitrogen), nitrate nitrogen (NO3-N, nitrate nitrogen), Color (Chromaticity), Oil-in-water, ISE (Ion Selective Electrode), Ammonia (NH4+, ammonia ion), Nitrate (NO3-, nitrate ion), Calcium (Ca2+, calcium ion) , Fluoride (F-, fluorine ion), Potassium (K+, potassium ion), Chloride (Cl-, chlorine ion) can be detected.

The water quality sensor 221 may detect the water quality of the water (filtered water) in the treatment water tank 21 in real time and provide the detected water quality to the control unit 230 . When the water quality data received from the water quality sensor 221 exceeds the allowable value, the control unit 230 returns the filtered water to the microorganism treatment unit 12 without evaporating the filtered water for reprocessing.

Under the control of the controller 230, the pump 222 may supply water (filtered water) in the treated water tank 21 to the mist spray nozzle 226 provided inside the evaporation chamber 225 at high pressure.

The three-way valve 223 can control the supply direction according to the quality of water (filtered water) in the treatment water tank 21 by the control unit 230 . That is, the control unit 230 supplies the water (filtered water) of the treated water tank 21 to the mist spray nozzle 226 of the evaporation chamber 225 if it passes the set criteria, and if it does not pass the criteria, it is supplied to the microorganism processor 12. can be sent back.

The filter 224 finally filters solids remaining in the supplied water of the treated water tank 21 .

The evaporation chamber 225 includes an inlet gate 2251 through which external air is introduced and an outlet gate 2252 through which internal air is discharged to the outside. Condensed water condensed inside the evaporation chamber 225 may be collected at the bottom of the evaporation chamber 225 . The condensed water in the evaporation chamber 225 may be joined to the condensed water collected in the condensate collection unit (235 in FIG. 3 ) to be described later and returned to the microorganism processor 12 or the compost stage 30.

Opening amounts of the entrance gate 2251 and the exit gate 2252 may be controlled by the control unit 230 . Between the entrance gate 2251 and the exit gate 2252 may be formed in a tunnel shape through which air moves. Although not shown in FIG. 2 , a hot air blower may be disposed at the entrance gate 2251 to heat and blow air. The hot air blower can be controlled and operated according to the external temperature.

The evaporation chamber 225 may maintain a temperature of 25° C., preferably 28° C. or more, and a humidity atmosphere of 80% or less, preferably 75% or less.

The mist spray nozzle 226 is disposed in the evaporation chamber 225 and can spray water (filtered water) in the treatment water tank 21 into ultra-fine water particles of 5 μm or less. Ultra-fine water particles of 5 μm or less sprayed from the mist spray nozzle 226 may be evaporated and cooled when the inside of the evaporation chamber 225 has a temperature of 25° C. or more and a humidity of 80% or less.

The air supply plate 227 may divide the evaporation chamber 225 up and down. The air supply plate 227 may be formed of a plurality of air passage holes made of a material having good thermal conductivity. The air supply plate 227 may supply heated air filled in the lower part of the evaporation chamber 225 to the upper part where the mist spray nozzle 226 is located. The temperature inside the evaporation chamber 225 is gradually lowered by cooling according to the evaporation of ultra-fine water particles. As a result, unless high-temperature air is supplied through the air supply plate 227, continuous evaporation cannot be achieved. The air supply plate 227 may include a heater that heats air introduced through the inlet gate 225-1 so that the temperature of the upper portion of the evaporation chamber 225 is maintained at 25° C. or higher. When the air supply plate 227 includes a heater, the inlet gate 2251 may include a suction fan without an air heating function.

The internal temperature sensor 228-1 detects the internal temperature of the evaporation chamber 225 in real time and transmits it to the controller 230. When determining that the internal temperature of the evaporation chamber 225 is equal to or lower than a preset value, the control unit 230 may stop spraying ultra-fine water particles through the mist spray nozzle 226 or adjust the spray amount. On the other hand, the controller 230 may control the hot air blower of the entrance gate 2251 when the internal temperature of the evaporation chamber 225 is higher than a preset value. The temperature setting value of the inside of the evaporation chamber 225 is suitable within a range capable of maintaining an equilibrium between evaporative cooling according to spraying of the mist spray nozzle 226 and temperature rise by the hot air blower of the inlet gate 2251. That is, the temperature setting value inside the evaporation chamber 225 may be determined according to the spray amount of the mist spray nozzle 226, the operation of the hot air fan of the entrance gate 2251, and the operation of the exhaust fan 234.

The internal humidity sensor 228-2 detects the internal humidity of the evaporation chamber 225 in real time and transmits it to the control unit 230. When the internal humidity of the evaporation chamber 225 is equal to or greater than a preset value, the control unit 230 stops spraying ultra-fine water particles through the mist spray nozzle 226, reduces the amount of spraying, or outputs the air to the outside of the evaporation chamber 225. The discharge of evaporative air can be started or the amount of evaporative air can be increased. That is, if the humidity inside the evaporation chamber 225 is too high, the amount of condensation according to the saturated humidity may increase and the evaporation efficiency may decrease.

The external temperature sensor 229-1 detects the external temperature of the evaporation chamber 225 in real time and transmits it to the controller 230. When the external temperature of the evaporation chamber 225 is below a preset value, the control unit 230 stops or reduces the spraying of ultra-fine water particles through the mist spray nozzle 226 or discharges the evaporation air to the outside of the evaporation chamber 225 can be stopped or reduced. When the external temperature is low, a small amount of evaporative air may be continuously discharged because the high-temperature, high-humidity air meets the cold air outside and condenses easily.

The external humidity sensor 229-2 detects the external humidity of the evaporation chamber 225 in real time and transmits it to the control unit 230. When the external humidity of the evaporation chamber 225 exceeds a preset value, the control unit 230 stops spraying of ultra-fine water particles through the mist spray nozzle 226 or reduces the amount of sprayed water because the dispersion of evaporative air becomes difficult and condensation becomes easy. B, it is possible to stop or reduce the discharge of evaporation air to the outside of the evaporation chamber 225.

The control unit 230 may control the fog mist evaporator 22 as a whole. The control unit 230 controls the three-way valve 223 by determining whether to send the filtered water in the treated water tank 21 to the mist spray nozzle 226 or feed it back to the microorganism treatment device 12 according to the detection result of the water quality sensor 221. can

The control unit 230 may control the pump 222 to adjust the spray amount of the mist spray nozzle 226 .

The controller 230 may operate the plasma discharger 131 and/or the exhaust fan 234 in conjunction with the pump 222 .

The control unit 230 may control the operation of the pump 222, the hot air blower of the entrance gate 2251, and the exhaust fan 234 with reference to the temperature and humidity inside the evaporation chamber 225 and the outside temperature and humidity.

The control unit 230 includes at least one general-purpose processor that loads at least a part of the control program from the non-volatile memory in which the control program is installed into the volatile memory and executes the loaded control program. For example, a central processing unit (CPU) Unit), AP (application processor), or microprocessor.

The controller 230 may include a single core, a dual core, a triple core, a quad core, and multiple cores thereof. A plurality of controllers 230 may be provided. The control unit 230 may include, for example, a main processor and a sub processor operating in a sleep mode (eg, a mode in which only standby power is supplied). Also, the processor, ROM and RAM are interconnected through an internal bus.

The control program may include program(s) implemented in the form of at least one of BIOS, device driver, operating system, firmware, platform, and application program (application).

Plasma discharger 231 is installed in the path of external discharge from the inside of the evaporation chamber 225 . Microbial-degradable microorganisms contained in the evaporation air can be converted into microorganisms degradable microorganisms when exposed to plasma. In this way, the microscopic organic matter converted to be degradable by microorganisms may be included in the evaporative air and discharged to the outside to be dispersed to the outside air or collected in a state contained in the condensed water. Fine organic matter dispersed in the outside air can be decomposed by microorganisms existing in nature. Microorganisms contained in the condensed water may be returned to the microbial treatment machine and subjected to microbial reprocessing.

The deodorizer 232 includes an activated carbon filter 2321 and a heat transfer mesh 2322. The activated carbon filter 2321 can collect a small amount of malodorous gas components contained in the evaporated air. The activated carbon filter 2321 may be provided in a replaceable or washable form. The heat transfer mesh 2322 may be provided on an outer side of the activated carbon filter 2321. Evaporated air may be condensed in the activated carbon filter 2321 due to the temperature difference between the inner and outer surfaces of the activated carbon filter 2321, and as a result, the activated carbon filter 2321 may become wet and the ability to capture odorous gas components may decrease. there is. The heat transfer mesh 2322 allows high-humidity evaporative air to pass without condensation by keeping the temperature environment of the activated carbon filter 2321 constant throughout. The heat transfer mesh 2322 is made of a material having good thermal conductivity and may be integrally connected to the air supply plate 227. The heat transfer mesh 2322 may be a heater that generates heat by itself instead of being connected to the air supply plate 227.

The exhaust fan 234 may forcibly discharge the evaporation air in the evaporation chamber 225 under the control of the control unit 230 so that the evaporation air in the evaporation chamber 225 does not exceed a predetermined humidity value. The exhaust fan 234 is provided on the outlet gate 2252 side of the evaporation chamber 225 in FIG. 2, but may be omitted.

Figure 3 is a view showing the detailed configuration of the mist mist evaporator 22 according to another embodiment of the present invention. The same part as the configuration of the fog mist evaporator 22 shown in FIG. 2 is omitted from redundant description.

The fog mist evaporator 22 may further include a condensate collection unit 235 . The condensate collection unit 235 may be installed at an outlet side of the evaporation chamber 225 where evaporation air is discharged. Most of the high-temperature, high-humidity evaporation air in the evaporation chamber 225 is dispersed into the outside air, but may meet with some low-temperature outside air and condense. In this way, the collected condensed water is returned to the microorganism treatment device 12 and reprocessed or used as a moisture control agent in the compost heap 30, thereby achieving complete non-discharge.

4 is a view showing the second mist mist evaporator 24 for removing the odor of the organic wastewater pretreatment unit 10 according to an embodiment of the present invention.

Since the organic wastewater pretreatment unit 10, particularly the microbial treatment unit 11, performs microbial treatment of the organic wastewater while being open to the outside, a very strong smell is inevitably generated from the organic wastewater exposed to the outside. In particular, this smell is more severe in hot weather, causing complaints from nearby residents, which may hinder business.

The second mist spray evaporator 24 includes second mist spray nozzles 246 disposed on anoxic tanks 1 and 2 (121 and 123) and aeration tanks 1 and 2 (122 and 124) of the open microorganism treatment device 12.

The pump 222 supplies filtered water from the treated water tank 21 to the three-way valve 223 at high pressure. The three-way valve 223 may send filtered water to either the mist spray nozzle 226 or the second mist spray nozzle 246 under the control of the controller 230 . When the external temperature detected by the external temperature sensor 229-1 is 25° C., preferably 28° C. or higher, the control unit 230 controls the three-way valve 223 to send filtered water to the second mist spray nozzle 246. If the external temperature detected by the external temperature sensor 229-1 is less than 25° C., the controller 230 controls the three-way valve 223 to send the filtered water to the mist spray nozzle 226. Since the operation by the mist spray nozzle 226 has been described above, it is omitted.

The second mist spray nozzle 246 sprays the water (filtered water) of the treated water tank 21 onto the microorganism treatment device 12, that is, the anoxic tank 1 and 2 (121 and 123) and the aeration tank 1 and 2 (122 and 124), in an ultra-fine layer of 5 μm or less. It can be sprayed with water particles. The ultra-fine water particles sprayed from the second mist spray nozzle 246 have a temperature of 25 ° C or higher. It can be evaporatively cooled in the atmosphere. At this time, the fog spray evaporation air can be dispersed outside in a state in which odor molecules rising from the anoxic tanks 1 and 2 (121 and 123) and the aeration tanks 1 and 2 (122 and 124) are collected. In addition, the condensation water to be condensed while the evaporative air contains odor molecules or the fine water molecules that do not evaporate can collect odors and return to the anoxic tank 1,2 (121,123) and aeration tank 1,2 (122,124) As a result, the spread of odor can be prevented.

The control unit 246 may intermittently control the operation of the second mist spray nozzle 246 . When evaporative cooling of the second mist spray nozzle 246 occurs, additional evaporation conditions may not be satisfied according to the temperature drop, so it is necessary to stop the operation until external hot air is introduced.

In particular, when evaporative cooling occurs in the open upper part of the microorganism processor 12, the temperature of the upper part of the microorganism processor 12 is lowered, so the diffusion motion of the odor may be lowered until hot air from the outside is introduced.

On the other hand, in the season when the external temperature is low, the control unit 230 controls the three-way valve 223 to artificially form a high-temperature atmosphere by sending it to the mist spray nozzle 226 in the evaporation chamber (225 in FIG. 2) for evaporation and cooling. .

As another embodiment, the second mist mist evaporator 24 may further include an odor gas sensor. The controller 230 may operate the second mist mist evaporator 24 according to the degree of smell as well as the external temperature.

As another embodiment, the second mist mist evaporator 24 may further include a blower for discharging air between the microorganism processor 12 and the second mist mist nozzle 246 . The controller 230 controls the blower to rapidly blow out the evaporated air to continuously operate the second mist mist evaporator 24 without interruption.

5 is a flow chart showing a non-discharge treatment method for high-concentration organic wastewater according to an embodiment of the present invention.

In step S1, high-concentration organic wastewater such as livestock manure or pig wastewater is subjected to physicochemical pretreatment.

Referring to FIG. 2 , the organic wastewater supplied from the raw water storage tank 111 is oxidized in the reaction tank 112 by adding a treatment agent thereto. At this time, the organic wastewater and treatment chemicals are mixed and supplied to the reaction tank 112. Treatment agents include ferric sulfate, ferrous sulfate, ferrous chloride and/or ferric chloride. The amount of treatment chemicals is such that the pH of the reactants is 3.0 to 5.0, more specifically 3.5 to 4.0. When the pH of the reactant is less than 3.0, the amount of treatment chemicals increases, increasing costs, but treatment efficiency does not increase. Conversely, when the pH of the reactants is greater than 5.0, the amount of treatment chemicals is insufficient and the oxidation reaction is not efficiently performed. The organic wastewater and treatment chemicals are transferred to the reaction tank 111 as much as a desired amount of treatment at one time, and the organic wastewater and treatment chemicals are continuously and uniformly mixed in a predetermined amount during the entire transport time. As described above, the organic wastewater and the treatment chemical are already sufficiently mixed and introduced into the reaction tank 111. Then, using the reaction tank 111, the organic wastewater is chemically treated and oxidized.

Organic wastewater contains factors that hinder flocculation due to viscosity and fat, such as carbonates and volatile fatty acids. The treatment chemical is acidic and converts carbonate and volatile fatty acids, which are coagulant-inhibiting factors, into carbon dioxide by oxidizing them. At this time, a large amount of foam is generated in the reactant by carbon dioxide or the like, and most of dissolved organic matter, volatile fatty acids, pathogenic microorganisms, viscosity, toxicity, and the like are removed.

A large amount of bubbles are generated in the reactant supplied to the reaction tank 111. If these bubbles are not removed, the amount of reactant that can be accommodated in the reaction tank 111 may be reduced due to the bubbles, so bubbles generated in the reaction tank 111 are removed using a defoaming agent. The antifoaming agent effectively removes foam as it is sprayed onto the reactants. The timing of administration of the antifoaming agent may be adjusted according to the degree of foam generation. When the reaction tank 111 is filled with reactants to a certain extent or when the reactants corresponding to the amount of treatment are filled, the reactants are once again mixed and processed. Reactants are degassed prior to delivery. As the chemical oxidation treatment proceeds, the oxidation reaction is completed.

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When an inorganic coagulant among treatment chemicals is added to the coagulation tank 113, pig wastewater is coagulated. In this process, suspended solids and colloidal substances are chemically adsorbed and precipitated as solids. In the process of chemical treatment, a blower can be operated to promote mixing of the reactants and remove residual bubbles, and carbon dioxide can be supplied to the reactants to accelerate the oxidation reaction.

The above chemical treatment reaction is preferably completed within 1 hour 30 minutes to 2 hours, and the capacity of the line mixer and each pipe is designed so that the reactants pass through the line mixer 3-4 times on average within this time. If necessary, a plurality of line mixers may be provided in parallel.

On the other hand, when an underwater stirrer is operated during the oxidation reaction, agitation is increased and the reaction time can be shortened to about 30 minutes to 1 hour. In particular, when an underwater stirrer is used, the antifoaming agent is stirred as a whole, making it easy to remove bubbles. If an underwater agitator is used, subsequent neutralization and agglomeration treatment can be efficiently performed in a short time. Next, a neutralizing agent is added to the chemically treated reactant to neutralize it. As a neutralizing agent, a basic substance such as sodium hydroxide (NaOH) is used, and the pH of the reactant is raised to 7.0 to 8.0. In the neutralization process, it can be mixed only with a blower, and a line mixer can be used if necessary. In the neutralization process, the cohesion is strengthened and the floc becomes larger. If the pH is less than 7.0, the effect of strengthening the cohesiveness is weak, and if the pH is greater than 8.0, the increase in the effect of strengthening the cohesiveness is insignificant compared to the increase in the cost of using the neutralizer. Neutralization treatment may be performed for 30 to 40 minutes.

When an oxidizing agent is injected into pig wastewater, which is highly concentrated organic wastewater, bicarbonate ions containing a large amount of alkalinity in the wastewater oxidize with the chemical and are converted into gaseous carbon dioxide (CO2). When strong physical force is applied to the converted carbon dioxide gas (CO ₂ ), dissolved organic matter (BOD.COD), volatile fatty acids, pathogenic microorganisms, toxicity, carbonated bubbles, and viscosity present in wastewater are removed.

In this way, the inorganic coagulant (Fe ₂ So ₄ (iron sulfate oxide)) present during the oxidation reaction strongly reacts by strong physical force in the oxidation reaction process to strengthen the cohesion, and then the neutralization cohesion reaction produces suspended sludge (SS) is chemically adsorbed to precipitate as a solid phase, and the cohesive force of the sludge is bound to the maximum to make solid-liquid separation easy.

Oxidation and neutralization wastewater is separated into solid and liquid by the solid-liquid separator 115 (filter press). At this time, the filtered sludge is composted and recycled as a raw material for organic fertilizer, and it can be used as a recycled raw material for turning livestock manure into solid fuel as announced by the Ministry of Environment in 2018.

In step S2, the solid-liquid separated sludge treatment water is treated with aerobic microorganisms by aerobic fermentation for about 10-15 days using the MLE (Modified Ludzack Ettinger) method. At this time, when the ripening is completed, the aerobic livestock manure from which the odor is removed becomes a liquid fertilizer. It also shortens the period of subsequent aerobic, anaerobic and microbial biological treatment.

Thereafter, the microbially treated water treated with aerobic microorganisms may be removed up to sludge having a size of 0.1 μm by the flat membrane filter 13 installed in the aeration tank 2 (124) in the final stage, for example, a ceramic flat membrane. Ceramic flat membranes made of ceramics have a semi-permanent period of use and almost no sludge (SS) is detected in membrane filtration water. In addition, when the operating pressure rises above the set value, backwashing can be performed automatically. In this way, the filtrate filtered through the flat membrane is subjected to mist spray evaporation in the next step, and some of it may be used as washing water in the pig house.

In step S3, the flat membrane-filtered filtrate is introduced into the evaporation chamber at a predetermined temperature, for example, 28° C. or higher, preferably 35-40° C., and a predetermined humidity, for example, 75% or lower, in an atmosphere of 5 μm or lower. It can be evaporatively cooled in an instant by spraying fine water particles at a high pressure of 60cc per minute, for example. Some filtered water or condensed water due to supersaturation that has not been evaporated inside the evaporation chamber can be supplied to the moisture control agent of the compost bed or fed back to the microbial treatment machine for reprocessing.

In step S4, the evaporated air (gas) may be exposed to a plasma discharge in a discharge path to the outside. In the microbial treatment in step S2 described above, only treatable organic matter may be decomposed, and non-degradable organic matter may remain. As a result, non-decomposable organic matter exists in the air evaporated in step S3, which can be converted into organic matter treatable by microorganisms by exposure to plasma. In this way, the organic matter converted to be treated with microorganisms is discharged to the outside in a state included in the evaporation air, and may be decomposed by natural microorganisms or included in condensed water and fed back to the microorganism treatment device for treatment.

In step S5, odor gases such as trace amounts of nitrogen and ammonia contained in the evaporated air (gas) may be removed. Since the non-discharge treatment system of organic wastewater according to an embodiment of the present invention converts the final microbial treated water into evaporated air (gas) and disperses it into the atmosphere, it is necessary to treat it so that air pollution does not occur. Removal of the odor gas may be performed using an activated carbon filter. At this time, when the evaporated air (gas) with high humidity passes through the activated carbon filter, it is necessary to manage the temperature drop change so that condensation due to the temperature difference is not prevented.

In this way, the evaporated air (gas) from which the odor is removed may be discharged to the outside by the exhaust fan 234 .

In step S6, the evaporated air (gas) discharged to the outside may be partially condensed according to external humidity and temperature, and condensed water may be collected. The collection of condensed water is to prevent condensation from occurring near an outlet where evaporated air (gas) is discharged and thus water being absorbed into the ground. Since the evaporated air (gas) discharged to the outside is not easily dispersed to the outside when the humidity of the outside air is high, it is necessary to reduce the instantaneous amount of discharged air. The amount of evaporated air (gas) discharged to the outside is condensed into water when the temperature of the outside air is low, so it is necessary to reduce the instantaneous amount of discharged air. The amount of evaporated air (gas) discharged to the outside needs to be set in consideration of the external environment, that is, humidity, wind, temperature, etc., so that condensation water is not generated as much as possible. The condensed water can be fed back to the microbial treatment unit for reprocessing or used as a compost moisture regulator.

In step S7, the control unit 230 controls the three-way valve 223 when the external temperature is 25 ° C., preferably 28 ° C. or more, so that the water in the treated water tank 21 is transferred to the second mist mist evaporator (shown in FIG. 5) 246) can be sent. Alternatively, the control unit 230 controls the three-way valve 223 when the odor around the microorganism processor 12 exceeds a predetermined standard, so that the water in the treated water tank 21 is discharged to the second mist mist evaporator 246 shown in FIG. 5. can send.

The second mist spray evaporator 246 sprays 5 μm ultra-fine water particles onto the microorganism treatment device 12 to evaporate and cool it, and the water in the treated water tank 21 can be dispersed and discharged into the outside air. In addition, the evaporated air can collect odor molecules rising on the microorganism treatment device 12 to prevent the spread of odors to the outside.

The air evaporated by the second mist mist evaporator 246 may be forcibly dispersed into external air by a blower. Since the evaporative cooling by the second mist mist evaporator 246 lowers the temperature on the microorganism processor 12, it cannot continue before external air is introduced by the blower. In addition, if the blower operates before the evaporative cooling by the second mist mist evaporator 246 is performed, a problem in that the odor generated in the microorganism treatment device 12 spreads to the outside may occur. Therefore, the operation of the second mist mist evaporator 246 and the blower is such that the second mist mist evaporator 246 operates in an atmosphere in which evaporative cooling does not occur, or the smell of the microorganism processor 12 is not forcibly discharged to the outside. Operation timing needs to be set in consideration of

As described above, the organic wastewater non-discharge system 1 according to the embodiment of the present invention evaporates the filtered water generated from the organic wastewater on the microorganism treatment device 12, thereby achieving non-discharge through evaporation and dispersion to the outside along with odor collection and removal. .

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and is common in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Of course, various modifications are possible by those with knowledge of, and these modified embodiments should not be individually understood from the technical spirit or perspective of the present invention.

1: organic wastewater non-discharge treatment system 10: organic wastewater pretreatment unit
11: physicochemical preprocessor 111: raw water storage tank (111)
112: reaction tank 113: flocculation tank
114: solid-liquid separator 115: solid-liquid separation treatment tank
12: microbial treatment machine 121: anoxic tank 1
122: aeration tank 1 123: anoxic tank 2
124: aeration tank 2 13: flat membrane filter
20; Organic wastewater post-treatment unit 21: treatment water tank
22: mist mist evaporator 221: water quality sensor
222: pump 223: three-way valve
224: filter 225: evaporation chamber
226: mist spray nozzle 227: air supply plate
228-1: internal temperature sensor 228-2: internal humidity sensor
229-1: external temperature sensor 229-2: external humidity sensor
230: control unit 231: plasma discharger
232: deodorizer 234: exhaust fan
235: condensate collector 24: second mist mist evaporator

Claims (5)

a microbial treatment device that receives sludge treated water filtered from organic wastewater, includes an anoxic tank and an aeration tank with an open top, and treats the stored sludge treated water with microorganisms;
a flat membrane filter for filtering fine solids from the microbially treated water treated in the microbial treatment unit;
A first mist spray evaporator having an evaporation chamber capable of maintaining a predetermined temperature and a first mist spray nozzle disposed in the evaporation chamber to inject the filtered water into ultra-fine water particles;
A second mist spray evaporator provided on the open anoxic tank and the aeration tank and having a second mist spray nozzle for high-pressure spraying of the filtered water filtered by the flat membrane filter as ultra-fine water particles onto the open anoxic tank and the aeration tank;
a valve supplying the filtered water to either the first mist spray nozzle or the second mist spray nozzle; and
A control unit controlling the valve so that the filtered water is supplied to the second mist spray nozzle when the odor around the microorganism treatment device is equal to or greater than a predetermined standard,
The second mist mist evaporator includes a pump for supplying the filtered water at a high pressure to the second mist spray nozzle,
The second mist mist evaporator includes an external temperature sensor for measuring temperature,
Wherein the control unit controls the valve according to the temperature. delete delete According to claim 1,
The control unit operates the second mist mist evaporator intermittently. According to claim 1,
The second mist spray evaporator includes a blowing fan for discharging air between the microorganism treatment device and the second mist spray nozzle.