KR20210125743A - Small-sized wastewater treatment apparatus for hog farming and animal husbandry - Google Patents

Abstract

The present invention relates to a treatment apparatus which performs a separation process for liquid fertilizers or treatment water generated by treating wastewater, and more specifically, to a small-sized wastewater treatment apparatus which treats wastewater using a ceramic separator and automatically backwashes the ceramic separator. The small-sized wastewater treatment apparatus according to the present invention comprises: at least one filter tank which filters wastewater pretreated in a pretreatment tank, and includes a plurality of ceramic separators therein, wherein each ceramic separator has a plurality of through-holes with micropores and each through-hole is sealed by a gasket; and a cleaning tank connected to the filter tank by a connection pipe, and configured to store a filtered filtrate and use the stored filtrate as cleaning water, wherein the cleaning water is backwashed at a predetermined pressure by air pressure such that the ceramic separators in the filter tank are washed.

Description

Small wastewater treatment device for pig or livestock {SMALL-SIZED WASTEWATER TREATMENT APPARATUS FOR HOG FARMING AND ANIMAL HUSBANDRY}

The present invention relates to a treatment device that undergoes a separation process for liquid manure or treated water generated by treating livestock wastewater (pig, livestock). It relates to a small wastewater treatment device.

Conventional methods for treating livestock wastewater include various types of physicochemical unit treatment processes and biological treatment processes, and a combination of unit processes has been used depending on the purpose of treatment. However, the existing treatment method is composed of a process that excludes efficient use of resources by focusing on the efficiency of purification and treatment of livestock manure. In addition, as wastewater discharge standards become stricter, in order to meet these requirements, the treatment becomes complicated, and the operation and maintenance are combined with difficult processes, making it an expensive treatment process. As the efficient combination of individual processes becomes difficult, the use of energy becomes inefficient and the throughput versus operating time decreases. In addition, the recycling rate is very low due to the limitation on the purification efficiency.

Accordingly, livestock manure, livestock wastewater, or livestock treated water can be processed through various biological treatment processes, rather than a method that relies on simple purification, by applying an advanced separation membrane process to the biological treatment of various aerobic or anaerobic processes. There is a demand for an environmentally friendly treatment method such as recycling or discharge.

However, there is a problem in that eutrophication occurs again due to sludge in the liquid manure or treated water when a long period of time passes even if it passes the environmental standards for such liquid manure or treated water.

Japanese Patent Laid-Open No. 2005-246307

The technical problem to be solved by the present invention is a wastewater treatment device that eliminates the cause of eutrophication by removing sludge in liquid manure or treated water, and prevents eutrophication from occurring even if the treated liquid manure or treated water is stored or discharged for a long time is to provide

In addition, it is applied as a pre-processing facility to reduce the load on the downstream microfiltration facility to provide stable service life and quality for a long time.

In addition, it is an object of the present invention to provide a small wastewater treatment apparatus capable of directly treating domestic wastewater or livestock wastewater by making the wastewater treatment apparatus small and using it in livestock farms.

However, the technical problems to be solved by the present invention are not limited to the above problems, and may be variously expanded without departing from the technical spirit and scope of the present invention.

A small wastewater treatment apparatus according to the present invention for solving the above problems filters the pretreated wastewater in a pretreatment tank, a plurality of ceramic separators are formed therein, and each ceramic separator has a plurality of through-holes having micropores formed therein. one or more filtering tanks, wherein the through-holes are each sealed by a gasket; a washing tank connected to the filtration tank by a connection pipe to store the filtered filtrate, and backwashing the washing water to a predetermined pressure using the stored filtrate as washing water to wash the ceramic separation membrane in the filtration tank; can be included.

Here, there are two or more filtration tanks, and the adjacent filtration tanks are connected by a U-shaped connecting pipe at the lower end or upper end, so that it is preferable to have a structure in which the entire filter tanks are connected in series.

Here, the filtrate stored in the washing tank is controlled to always maintain a constant water level, and it is preferable that the filtrate is backwashed under a predetermined pressure by applying the air pressure from the upper end while the filtrate maintains a constant water level. do.

Here, the washing tank may have an overflow pipe formed in the center, the overflow pipe may be connected to the outlet pipe at the lower end, and the upper end may be positioned with an opening inside the washing tank.

Here, the filtrate is placed in a state where the water level is maintained up to the opening of the overflow pipe, flows out through the opening, and in a state where the filtrate maintains the water level at a predetermined position, air pressure from the upper end of the washing tank By inputting , it is possible to send the washing water to the filtration tank under a predetermined pressure to wash the inside of the ceramic separation membrane in the filtration tank.

Other specific details of the invention are included in the detailed description and drawings.

Since sludge is removed with respect to the liquid manure or effluent produced by using the wastewater treatment method and treatment apparatus using the ceramic separator according to the embodiments of the present invention, the cause of eutrophication is thus removed to store or discharge liquid manure for a long time. Even though secondary eutrophication does not occur, it can help to improve the environment.

In addition, it is possible to provide a small wastewater treatment device capable of directly treating domestic wastewater or livestock wastewater by making the wastewater treatment device small and using it in livestock farms.

In addition, by applying an automatic washing structure through backwashing to prevent deterioration of filtration function due to the accumulation of various debris in the small pore size of the ceramic membrane used for medium and long-term use, it is possible to provide a wastewater treatment device capable of filtering and cleaning at the same time. have.

However, the effects of the present invention are not limited to the above effects, and may be variously expanded without departing from the spirit and scope of the present invention.

1 is a flowchart showing a liquid fertilizer production process of wastewater.
2 is a schematic configuration diagram of a small wastewater treatment apparatus according to the present invention.
3 is a schematic perspective view of a filtration tank of a small wastewater treatment apparatus according to the present invention.
4 is a schematic perspective view of a ceramic separator applied to a small wastewater treatment apparatus according to the present invention.
5 is a cross-sectional structural view of a filtration tank applied to a small wastewater treatment apparatus according to the present invention.
6 is a cross-sectional structural view of a washing tank applied to a small wastewater treatment apparatus according to the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments, and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, "comprises" and/or "comprising" refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless specifically defined explicitly.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and repeated descriptions of the same components are omitted.

The wastewater used in the present invention may be used as a generic name including all of domestic wastewater, leachate, livestock manure, livestock wastewater or livestock wastewater treated water.

In the present invention, the main technical feature is to filter/separate/concentrate the sludge of liquid fertilizer or treated water produced after biological treatment of wastewater in a microbial removal method using a ceramic separation membrane device.

The inorganic membrane is a porous fine ceramic separator sintered with alumina, titania, or zirconia at a very high temperature. Ceramic membranes generally have an asymmetric structure with a porous supported active membrane layer. The macroporous support guarantees mechanical resistance, while the active layer is capable of microfiltration, ultrafiltration and even separation of nanofiltration (from 10 μm to 1 KD). Ceramic separators always operate in cross-flow mode. The turbid fluid passes through the membrane layer inside the channel at high speed. A clear liquid containing fine molecules driven by the ceramic membrane transverse pressure (TMP) migrates vertically through the ceramic membrane layer and permeate, while solids and molecules larger than the ceramic membrane are rejected in the retentate. Therefore, the feed fluid is purified, concentrated, and purified to remove the sludge of livestock manure, livestock wastewater, or livestock treated water, which is a factor for secondary eutrophication after undergoing physical and chemical unit treatment processes and biological treatment processes. .

In the past, livestock manure or livestock wastewater was treated in the storage tank - flow control tank - anoxic tank - aerobic tank (liquid fertilizer tank), and after sedimentation and dehydration, the wastewater was treated by spraying it with liquid fertilizer or discharging it to a river.

However, in the existing treatment method, even if the liquid fertilizer or effluent meets the environmental standards at the time of discharge, if a long period of time elapses after spraying or discharging, odors are generated in rivers, etc. do. In order to solve this problem, the present invention aims to eliminate the cause of eutrophication by removing the sludge from the liquid manure, treated water, and effluent through a filtration/concentration treatment process using a ceramic separation membrane. If sludge is removed for liquid manure or effluent, eutrophication does not occur even after long-term storage or discharge.

First, the process of forming liquid fertilizer or effluent before filtering using a ceramic separator in the present invention will be described, and then the present invention will be described.

Liquid manure or effluent is filtered and concentrated by (1) first treatment using a foreign matter treatment machine and centrifugal dehydrator, (2) second treatment of biological process, and (3) separation process to collect liquid manure, discharge, and treated water. It can be formed through three stages of advanced treatment (third treatment), provided that the order of (2) second treatment and (3) advanced treatment (third treatment) of the biological process may be changed.

Referring to FIG. 1 , the first treatment step is configured as a process of passing through a contaminant treatment machine ( S2 ) and a centrifugal dehydrator ( S3 ) to remove solids from the wastewater after introducing wastewater into the treatment plant ( S1 ).

The second treatment step is a step of biologically treating (S4) wastewater that has undergone the first treatment step.

In the advanced treatment (third treatment) step, the wastewater that has passed through the above steps (S2, S3, S4) is finally treated with a ceramic membrane (CMF) (S5), and the treated water is discharged through the membrane (S7) and ( S8) It is a post-processing step configured as a process of producing liquid fertilizer (S6).

As another method, after the S1 to S3 process, treatment with a ceramic membrane (S5), biological treatment (S4), the treated water is discharged through the membrane membrane (S7) and (S8) liquid fertilizer It may proceed to the process of producing (S6).

Hereinafter, a treatment (S5) apparatus by the ceramic separator after or before the biological treatment (S4) process will be described.

2 is a schematic configuration diagram of a small wastewater treatment apparatus according to the present invention.

As shown in FIG. 2 , the small wastewater treatment apparatus 10 may include filtration tanks 14 , 15 , 16 , a cleaning tank 17 , and a pump 13 .

The pump 13 may generate power to provide biologically treated wastewater or pretreated wastewater to the filtration tanks 14 , 15 , 16 .

The ceramic separator 22 in the filtration tanks 14, 15, and 16 is as shown in FIGS. 3 and 4 .

The small wastewater treatment device 10 may also include an inlet pipe, a concentrated water outlet pipe and an outlet pipe.

The post-treatment process of the small wastewater treatment device 10 is as follows.

In the small wastewater treatment system 10, the route in the treatment process is a solid line route, indicating an unfiltrated route, a double-dotted line route, indicating a filtrate route, and a dotted line route, a backwashing method. The cleaning route is indicated.

The wastewater is collected in the undiluted solution tank 11, and the wastewater collected in the undiluted solution tank 11 goes through the pretreatment tank 12 and undergoes a pretreatment process (such as contaminant treatment and centrifugation).

The wastewater pretreated by the pretreatment tank 12 may undergo a biological treatment process and proceed to the small wastewater treatment device 10 , or may proceed directly to the small wastewater treatment device 10 and then undergo a biological treatment process. Here, an example in which the biological treatment process is performed after passing through the small wastewater treatment device 10 (post-treatment process) will be described.

In addition, the pre-treatment tank 12 may be configured to be included in the small wastewater treatment device 10, it is also possible to configure separately.

The wastewater pretreated by the pretreatment tank 12 enters the filtration tank 14 by the pump 13 .

There is one or more filtration tanks 14, and in the case of two or more, they may be connected in series with each other through a connecting pipe.

The filter tanks 14, 15, and 16 are connected in series through a connection pipe, a connection pipe is connected to the upper end of the filter tank 14, and a U-shaped connector pipe is connected to each other at the bottom of the filter tank 14 and the filter tank 15, and the filter tank (15) The upper end and the upper end of the filtration tank 16 are again connected with a U-shaped connecting pipe, and the connecting tube is connected from the lower end of the filtration tank 16 to the washing tank 17 and the sludge tank 18 .

The pretreated wastewater passes through three filtration tanks 14, 15, and 16 connected in series, and is separated into a filtrate and an unfiltered liquid. do.

The washing tank 17 has a function as a filtrate storage device and a washing water storage device for storing washing water during backwashing, and the filtrate itself may be washing water.

The washing tank 17 discharges the surplus filtrate to the liquid manure tank 19 under certain conditions when the filtrate is introduced, and the filtered filtrate, that is, the liquid manure is stored and utilized in the liquid manure tank 19.

When the wastewater treatment device is used for a certain period of time, residues such as untreated sludge in the filters (ceramic membranes) in the filtration tanks 14, 15, and 16 may block fine pores, thereby reducing the filtration function.

In this case, the washing process may be performed as a reverse process of the filtration process, and it is possible to backwash regularly or irregularly.

Referring to the backwashing process, after closing the valves at specific positions to satisfy a predetermined pressure condition, air of a predetermined pressure is introduced into the cleaning tank 17 through the air compressor 20 .

In the washing tank 17, as the air pressure increases, the washing water (filtrate) enters the filtration tub 16 through the connection pipe, and sequentially enters the filtration tub 15 and the filtration tub 14 while introducing the filtration tub 16 , 15, 14) As it passes through the inner ceramic separation membrane, it is possible to remove the residues attached to the fine pore diameter, so that the inside of the filtration tank can be cleaned.

The washing water including the residue may be reintroduced into the stock solution tank 11 through the pump 13 .

The internal structures of the filtration tanks 14 , 15 , 16 and the washing tank 17 will be described in detail below, and the process of filtering wastewater by the internal structures of the filtration tanks 14 , 15 , 16 and the washing tank 17 and The backwashing process can be fully explained.

3 is a schematic perspective view of a filtration tank of a small wastewater treatment apparatus according to the present invention, and FIG. 4 is a schematic perspective view of a ceramic separation membrane applied to a small wastewater treatment apparatus according to the present invention.

3 and 4 , a plurality of ceramic separators 22 of FIG. 4 may be included in the filtration tanks 14 , 15 , and 16 .

Although FIG. 3 shows a tube including seven ceramic separators, the present invention is not limited thereto, and the tube may be formed in such a way that the ceramic separator may include two or more.

When one ceramic separator is formed in one filtration tank, there is a limit to the capacity that can be filtered, and in particular, when the solution is livestock wastewater as in the present invention, two or more ceramic separators are used in consideration of treatment capacity and treatment efficiency. A filtration device is required.

In the present invention, it is possible to increase the efficiency of filtration and concentration of livestock wastewater by configuring a plurality of ceramic separation membranes in one filtration tank.

In particular, since the ceramic separation membrane has the highest filtration capacity when a predetermined or higher pressure is applied from the top and bottom, it can be said that forming one ceramic separation membrane in one filtration tank does not have the actual livestock wastewater treatment capability. In order to solve this problem, in the present invention, it is possible to maximize the treatment capacity of livestock wastewater by having a structure capable of sealing each of a plurality of ceramic separation membranes in one filtration tank.

The filtration tanks 14, 15, and 16 may have a cylindrical metal body and flanges 21 formed at both ends, and holes into which the ceramic separator 22 may be inserted may be formed at the upper and lower ends.

The number of holes into which the ceramic separator 22 can be inserted is the same as the number of ceramic separators.

Each ceramic separator 22 implements a sealing structure by a gasket 23 when inserted into the filtration tanks 14 , 15 , 16 from upper and lower ends.

The upper and lower ends of the ceramic separator 22 may be machined to have an outer diameter smaller than the outer diameter of the body to insert the gasket 23 .

The treated water treated through the pretreatment process of FIG. 1 is sequentially introduced into the filtration tanks 14 , 15 , and 16 through the inlet pipe of the small wastewater treatment device 10 .

The influent water is filtered/separated/concentrated by the ceramic separation membrane 22 included in each of the filtration tanks 14, 15, and 16, and the treated water passing through the ceramic separation membrane 22 is discharged through the outlet pipe and The concentrated water that did not pass through the separation membrane 22 is discharged through the concentrated water discharge pipe.

The concentrated water discharged through the concentrated water discharge pipe may be fed back to the filtration tanks 14, 15, and 16 through the inlet pipe through the loop, and may also be recovered to the stock solution tank through the concentrated water discharge pipe.

The influent flowing into the ceramic membrane passes through the membrane and is separated into final treated water and concentrated water. The final treated water is of very good quality and can be reused as liquid fertilizer, washing water, landscaping water, boiler water, etc. The treated water exceeding the reuse capacity may be discharged.

5 is a cross-sectional structural diagram of a filtration tank applied to a small wastewater treatment apparatus according to the present invention, and FIG. 6 is a cross-sectional structural diagram of a cleaning tank applied to a small-sized wastewater treatment apparatus according to the present invention.

Referring to Figure 5, look at the filtration and concentrated water treatment process of livestock wastewater.

The body of each of the filtration tanks 14, 15, and 16 of the small wastewater treatment apparatus 10 is coupled to the upper and lower caps 217 and flanges 216, and a plurality of ceramic separation membranes 22 are provided therein with gaskets 23 ) and are joined together while sealed by

The inlet pipe 211 at the bottom is connected to the pump 219 to introduce wastewater (meaning pretreated treated water), and the introduced wastewater passes through the through holes 221 of the plurality of ceramic separation membranes 22, It is filtered by the pore diameters of the fine porous ceramic membrane 222 formed on the separation membrane 22 .

The filtered filtrate flows out through each outlet pipe 215 at the bottom, and flows out to the storage tank through the outlet pipe 215 of the filtration tank 16 of the last stage, and the outflow rate can be checked by a flow meter. .

The unfiltered concentrated water is sequentially filtered through the concentrated water discharge pipe (212, 213, 214) and the unfiltered concentrated water is recovered to the tank, and the flow rate of the discharged concentrated water can be checked by another flow meter, check The amount of wastewater flowing in through the flow control valve is controlled according to the flow rate.

Inside the filtration tanks 14, 15, 16, a plurality of ceramic separation membranes 22 are placed in a sealed state by a gasket, and the diameter of the through hole 221 through which the wastewater passes, the inlet pipe 211, and the concentrated water outlet pipe Since the internal pressure is applied according to the diameter, the filtration action by the ceramic separator 22 is possible by the applied pressure.

At this time, when the flow rate of the discharged concentrated water is less than the reference value, the sludge residue adheres to the inner surface of the through-hole 221 of the ceramic separation membrane 22 and blocks the hole (pore diameter) to filter tanks 14, 15, 16. filtration ability may be reduced.

At this time, as described above, by operating the backwashing action to pressurize the flow rate in the reverse direction by air pressure, the debris blocking the pore diameter of the ceramic separator 22 is hydraulically washed, and the through hole 221 of the ceramic separator 22 is ) to maintain the inside in a normal state, and through this, it has the effect of operating the filtration function in a normal state.

This control of hydraulic pressure and flow rate can maximize the filtration function of the ceramic membrane 22, and furthermore, an automatic cleaning function is possible, so through the separation of the filtration tanks 14, 15, 16 and the separation of the ceramic membrane 22 every day. Manual washing becomes unnecessary, and the efficiency of separation and filtration of livestock wastewater can be maximized.

In the present invention, when the filtration/separation/concentration treatment process is performed on wastewater, the filtration/separation/concentration treatment process is performed using a ceramic separator, and the ceramic separator may have a pore size of 20 nm to 80 nm, , in particular, it was found that the result of treating liquid fertilizer using a ceramic separator having a pore size of 50 nm was the most efficient.

Next, referring to FIG. 6 , the internal structure of the washing tank 17 can be confirmed.

The washing tank 17 serves as a filtrate storage tank into which the filtrate filtered by the ceramic separation membrane 22 is introduced from the filtration tanks 14, 15, and 16, and the filtrate is used as washing water for the filtration tanks 14, 15, 16) The through-hole 221 of each internal ceramic separator 22 and the micropore diameter formed in the through-hole 221 may function as a cleaning tank for washing with water pressure through air pressure.

(A) shows the inflow path of the filtrate, (B) shows the backwashing process.

The washing tank 17 has a cylindrical housing 310, a connection pipe 311 connected to the lower end of the housing 310, a washing tube 316 connected to the lower end of the housing 310, and overflows the filtrate. It may be configured to include an overflow pipe 312 for discharging to the outside, and a pressure pipe 314 connected to the upper center of the housing 310 to pressurize the air pressure.

The connecting pipe 311 is connected to the side filtration tanks 14, 15, and 16 to introduce the filtered filtrate of the treated water, and the washing pipe 316 is connected to the filtration tanks 14, 15, and 16. It is a pipe for washing the ceramic separation membrane 22 in the filtration tank by backwashing the washing water.

The overflow pipe 312 maintains the filtrate at a certain level in the washing tank 17, and only the filtrate overflowed through the overflow pipe 312 can be introduced into the tank through the outlet pipe 313, , when the air pressure is pressurized from the top by the flow rate maintained at a constant water level, the washing water is sequentially introduced into the filtration tanks 14, 15, 16 through the washing tube 316 by hydraulic pressure, and the ceramic separation membrane ( 22) can be cleaned.

It is possible to apply pressure while the passage connected to the cleaning tank 17 is closed by a valve or the like without the overflow pipe 312, but it is preferable to backwash the pore diameters of the ceramic separator 22 with a strong pressure during cleaning. , by forming the overflow pipe 312 in the center of the washing tank in order to apply a stronger pressure accordingly, the pressing force can be increased by reducing the pressurized volume (or surface area) of the washing water filled to a predetermined water level.

As shown in (A), the filtered filtrate flows in through the connection pipe 311, the introduced filtrate fills up to the upper opening of the overflow pipe 312, and only the overflowed filtrate flows through the overflow pipe 132 ), and at this time, the filtrate is placed in a state where the water level is always filled up to the upper opening of the overflow pipe 132 . This may be a means for backwashing by applying pressure.

As shown in (B), in the case of backwashing, when air pressure is introduced from the upper end of the washing tank 17 in a state in which the necessary valve is closed, the air pressure is applied to the washing water (filtrate) maintaining a constant water level, and the washing water flows out through the cleaning tube 316, and the spilled cleaning water passes through the series-connected tube sequentially through the ceramic separation membrane 22 while a constant pressure is applied to clean the inside of the ceramic separation membrane 22. .

Washing water containing residues can be collected back into the stock tank.

As described above, the compact wastewater treatment device 10 of the present invention filters wastewater through the ceramic separation membrane in a state in which the filtration tanks 14 , 15 , 16 including the ceramic separation membrane 22 are connected in series, and the residues such as sludge By backwashing the pore diameter of the through-hole of the ceramic separator clogged by them from the cleaning tank 17 to enable the cleaning of the ceramic separator, filtration and washing can be made in an automated state, and the filter tank is separated for cleaning the filter tank, It is possible to provide a wastewater treatment apparatus that can be used in a compact size in that a separate process and apparatus for inputting the washing water is not required.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can realize that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: small wastewater treatment device 11: undiluted solution tank
12: pretreatment tank 13: pump
14, 15, 16: filtration tank 17: washing tank
18: sludge tank 19: liquid fertilizer tank
20: air compressor 21: flange
22: ceramic separator

Claims (5)

The wastewater pretreated in the pretreatment tank is filtered, and a plurality of ceramic separation membranes are formed therein, and each ceramic separation membrane includes a plurality of through-holes having micropore diameters formed therein. The through-holes are each sealed by a gasket; ;
A washing tank connected to the filtration tank by a connection pipe to store the filtered filtrate, and backwashing the washing water to a predetermined pressure using the stored filtrate as washing water to wash the ceramic separation membrane in the filtration tank; A small wastewater treatment device for pigs or livestock, including. According to claim 1,
The filter tank is two or more,
Adjacent filtration tanks are connected by a U-shaped connection pipe at the bottom or top, and the entire filter tank is connected in series. A small wastewater treatment device for pigs or livestock. According to claim 1,
The filtrate stored in the washing tank is controlled to always maintain a constant water level,
A small wastewater treatment device for pigs or livestock, wherein the filtrate is backwashed under a predetermined pressure by applying the air pressure from the upper end in a state in which the filtrate maintains a constant water level. According to claim 1,
The washing tank is formed with an overflow pipe in the center,
The overflow pipe is connected to the outlet pipe at the bottom, and the top is located with an opening inside the washing tank, a small wastewater treatment device for pigs or livestock. 5. The method of claim 4,
The filtrate is placed in a state maintaining the water level up to the opening of the overflow pipe, and flows out through the opening,
In a state in which the filtrate maintains the water level at a predetermined position, by inputting air pressure from the upper end of the washing tank, the washing water is sent to the filtration tank under a predetermined pressure to wash the inside of the ceramic separation membrane in the filtration tank, pig or Small wastewater treatment equipment for livestock.

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