KR20100066785A - Automatically operated advanced technology and equipment for the treatment of sewage and wastewater - Google Patents

Abstract

PURPOSE: A clogging preventive device of a membrane separation device for advanced treatment and a method thereof are provided to prevent a clogging phenomenon of an air gap when processing water is filtered through a separation film unit. CONSTITUTION: A clogging preventive device of a membrane separation device for advanced treatment comprises the following: a separation film unit(160) selectively filtering sewage and effluent according to a size of a particle; a suction line(L1) connected to the separation film unit; a suction pump(170) which solid-liquid separates a mixed solution flowing in the separation film by absorbing pressure, emits processing water to the outside; a differential pressure gauge(220) detecting the pressure of the processing water flowing in to the suction line; a processing water line (L2) transmitting processing water which is solid-liquid separated to a specified location; a processing water on off valve(162); a back-washing water supply line(L3) branched in the processing water line; a back-washing water supply tank(200); a back-washing water supply on off valve(164); a back-washing water injecting line(L4) formed between the back-washing water supply tank and the separation film frame device; a backwashing pump(204); and a cleaning agent storage tank(210).

Description

Automatically operated advanced technology and equipment for the treatment of sewage and wastewater}

The present invention relates to an advanced treatment membrane separation device for treating sewage and wastewater, and more particularly, an advanced treatment blockage preventing device capable of preventing blockage generated in the process of treating wastewater with the advanced treatment membrane separation device. An apparatus and method for preventing occlusion of

Membrane separation facilities applying the conventional separation membrane method have received a lot of attention due to the high and stable treatment efficiency, but has a natural problem of membrane blocking occurs during long-term operation. Conventionally, when a membrane blockage occurs, the membrane unit is taken out of the aerobic tank or membrane separation tank in operation and then immersed in a separate cleaning tank containing chemicals such as acids, alkalis, and oxidizers to eliminate the blockage, and then left for several hours. Solved. However, this is a process that requires a lot of manpower, time and cost, and may not be a problem at the site where one or two membrane units are put in. However, membrane separation at sites where dozens or hundreds of membrane units are put in, such as sewage treatment plants. The application of public law is virtually impossible.

The present invention is to provide an apparatus and method for preventing the blockage of the advanced membrane separation apparatus that can easily prevent the inevitable occlusion generated during the membrane separation process in operating the advanced membrane separation apparatus.

The present invention provides a membrane treatment apparatus for treating sewage and wastewater in order to achieve the above object, comprising: a separation membrane unit for selectively filtering sewage and wastewater according to particle size; A suction line connected to the separator unit; A suction pump connected to the suction line to communicate with the separator unit to solid-separate the mixed liquid introduced into the separator by suction pressure to discharge the treated water to the outside; A differential pressure gauge installed in the suction line and detecting a pressure of the treated water flowing into the suction line when the suction pump is operated; A treatment water line connected to the suction pump and sending the treated water separated through the suction pump to a specific place; A treatment water opening / closing valve installed in the treatment water line to control discharge of the treatment water to the outside; A backwash liquor supply line branched from the treated water line; A backwashing liquid supply tank connected to one side of the backwashing liquid supply line; A backwashing liquid supply opening / closing valve installed in the backwashing liquid supply line to control backwashing liquid flowing into the backwashing liquid supply tank; A backwashing liquid injection line formed between the backwashing liquid supply tank and the separator frame device; A backwash pump installed in the backwash solution injection line for forcibly injecting backwash solution into the membrane unit; A backwash liquid injection opening / closing valve installed between the backwash pump and the separation membrane unit to control the backwash liquid injection; A detergent storage tank connected to the backwashing supply tank and supplying a detergent by a cleaner transfer pump provided at one side; It provides a blockage preventing device of the membrane separation device for advanced processing, characterized in that consisting of.

In addition, the treatment pump opening and closing valve of the treatment water line is closed in the state that the suction pump and the broa operating, the backwash liquid supply opening and closing valve installed in the backwash liquid supply tank line is opened and the treated water is transferred to the backwash liquid supply tank; Stopping the suction pump by detecting a backwashing liquid supply tank stirrer installed in the backwashing liquid supply tank and transmitting an electric signal to the controller when the amount of treated water is supplied into the backwashing liquid supply tank; After the suction pump is stopped, the detergent transfer pump is operated to transfer a predetermined amount of the detergent contained in the detergent electric charge tank to the backwash solution supply tank; In the backwash solution supply tank, the backwash solution made by mixing the treated water and the cleaning agent flows into the separator unit through the backwash solution supply tank and exits through the pores from the inside of the separator to the outside of the separator. It provides a method for preventing the blockage of the membrane separation apparatus for advanced processing, characterized in that it comprises a; removing the blockage from being removed from.

As described above, according to the present invention, by fully using the blockage prevention device and method of the membrane processing device for advanced processing, fully automatic treatment of sewage, wastewater, etc. without the need of manpower, and simply blockages that may occur in the process. By preventing or appealing, the processing efficiency of the device can be increased and maintenance can be performed very easily.

According to the present invention, the membrane can be backwashed automatically in order to solve the membrane blocking, which is the biggest problem in the operation of the membrane separation method with high and stable processing efficiency. Occupational automatic backwash can be used to prevent or eliminate occlusion.

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

1 is a conceptual diagram of the present invention, raw water, such as sewage and wastewater introduced into the membrane separation facility is introduced into the flow rate adjustment tank 110 through the settling tank, the coarse screen tank. The raw water introduced into the flow adjusting tank 110 is stored in the flow adjusting tank 110 and then transferred to the oxygen-free tank 130 through the drum screen 120 by the raw water feed pump 112 installed in the some flow adjusting tank 110. . The raw water feed pump 112 is operated by a submersible pump and stopped by a level switch (not shown) installed in the flow regulating tank 110.

The level switch in the flow adjusting tank 110 is divided into a low level switch and a high level switch. When the water level in the flow adjusting tank 110 reaches the high level switch, the high level level switch detects this and sends an electric signal to the MCC control panel (not shown). The control panel sends a signal back to the raw water feed pump 112 so that the raw water feed pump 112 is operated. When the water level is lowered to reach the low water level switch, the raw water feed pump 112 stops receiving the signal again.

In order to prevent the solid matter contained in the raw water introduced into the flow adjusting tank 110 to sink and accumulate in the flow adjusting tank 110, an underwater mixer 114 is installed in the flow adjusting tank 110 to stir the raw water.

The raw water transported by the raw water feed pump 112 passes through the drum screen 120, which can remove fine contaminants such as hair and tissue pieces contained in the raw water, and is equipped with a mesh network of 0.1-1 mm in size. . The drum screen 120 may be installed on the sludge concentrate storage tank 240 so that the contaminants caught on the screen may immediately fall into the sludge concentrate storage tank 240.

The drum screen 120 is interlocked so as to operate together when the raw water feed pump 112 in the flow adjustment tank 110 is operated. The raw water passing through the mesh screen of the drum screen 120 is divided into the anaerobic tank 130 and the anaerobic tank 140 through the distribution tank 122. This split inflow is split ratio according to the nature of the raw water, at this time 100% may be introduced into the anaerobic tank 130, a portion may be distributed to the anaerobic tank 140 of the rear end, but 100% of the anaerobic tank (140) It does not flow in.

In the anoxic tank 130, denitrification is caused by microorganisms so that the nitrate nitrogen in the mixed solution of the raw water and the existing liquid in the reaction tank is converted to nitrogen gas and removed. In the anoxic tank 130, the conveying liquid conveyed from the raw water and the degassing tank 190 of the rear end is mixed, and an underwater mixer 132 is installed in the anoxic tank 130 so that solids such as microorganisms present in the mixed solution sink and do not accumulate on the floor. .

The mixed liquid in the anaerobic tank 130 naturally falls into the anaerobic tank 140 at the rear end by gravity. In the anaerobic tank 140, when the raw water is split inflow, the mixed liquid from the raw water and the anoxic tank 130 of the front end is mixed. In the anaerobic tank 140, phosphorus is eluted from the cells of the microorganism without oxygen at all. In the anaerobic tank 140, an underwater mixer 9 is installed to prevent solids such as microorganisms from being precipitated.

The mixed liquid in the anaerobic tank 140 is transferred to the aerobic tank (membrane separation tank) 150 at the rear end by natural flow. The ammonia nitrogen and the nitrite nitrogen in the mixed solution transferred to the aerobic tank 150 are nitrated to nitrate nitrogen by the microorganisms and the phosphorus and phosphorus components in the raw water discharged from the anaerobic tank 140 are removed by the intake of the microorganisms in the aerobic tank 150. do.

Dissolved organic matter, which is a BOD component, is partially removed while passing through the anaerobic 130 and anaerobic tank 140 of the front end, but the dissolved organic matter introduced into the aerobic tank 150 is mostly removed in the aerobic tank 150.

Dissolved organics and treated water from which nitrogen and phosphorus are removed are filtered through the membrane unit 160 immersed in the aerobic tank 150 and discharged out of the facility. The separator unit 160 is composed of a separator frame capable of fixing the separator and the separator. On the surface of the separator, countless pores of 0.1 ~ 0.4㎛ size are formed. Through these pores, the treated water in the mixed liquid outside the separator is introduced and solids such as microorganisms are filtered out.

The membrane unit 160 is connected to and connected to each other through the suction pump 170 installed on the outside of the exhalation tank 150 and the suction inline (L1). Pneumatic pressure is formed and this vacuum pressure is a driving force to allow the treated water excluding the solids such as microorganisms in the mixed liquid outside the separator to be introduced into the separator through the pores. At this time, solids such as microorganisms may move together to the surface of the membrane according to the flow of treated water, and thus blockage may occur to prevent voids. In order to prevent this, the broa 180 used to supply air for breathing of the microorganism may be separated from the membrane unit ( 160) By supplying air by connecting to the diffuser at the bottom, disturbing action of air bubbles generated by rising air discharged from the diffuser and formation of water flow prevent the solids from moving to the membrane surface and attaching.

The treated water introduced into the separator is discharged to the outside through the treated water line (L2) through the suction pump 160 along the suction line (L1).

The suction pump 170 is operated by receiving an electrical signal by the level switch installed in the exhalation tank 150. The level switch in the aerobic tank 150 is divided into a high water level switch and a low water level switch. When the water level is lowered and reaches the low water level switch, the low water level switch detects this and sends a signal to the controller, which is then transmitted to the suction pump 170 and the suction pump 170. ) Will be activated. On the contrary, when the water level is increased to reach the high water level switch, the suction pump 170 is stopped.

The suction pump 170 is intermittently operated to prevent the blockage of the separator. That is, clogging of the separator can be prevented by operating the suction pump 170 for several minutes and stopping again for several minutes.

When the water level in the aeration tank 150 is a low level, the broa 180 may perform an intermittent operation of repeating the operation and the stop while the suction pump 170 is stopped.

The mixed liquid remaining in the aeration tank 150 without being discharged to the outside is transferred to the degassing tank 190 at the rear end by natural flow. Free oxygen contained in the mixed liquid introduced into the degassing tank 190 is volatilized to the atmosphere in the degassing tank 190.

The mixed liquid in the degassing tank 190 is transferred to the anoxic tank 130 at the front end by an internal transfer pump 192 installed in the degassing tank 190 with nitric acid nitrogen (NO3-) and microorganisms in the state where free oxygen is removed. Will be returned. In order to remove fine contaminants such as hair present in the mixed solution in the conveyed process, the mixed solution is introduced into the oxygen-free tank 130 through the drum screen 120.

Automatic backwashing is performed in order to prevent or eliminate obstruction of the membrane which may occur during long term operation according to the apparatus and method of the present invention.

A backwash cycle is entered into the controller C to set the automatic backwashing at least once every few days. At the time of automatic backwashing, the treated water opening / closing valve 162 of the treated water line L2 is closed while the suction pump 170 and the broa 180 are operated, and the backwash liquid supply opening and closing valve installed in the backwashing liquid supply line L3 line. 164 is opened and the treated water is transferred to the backwash liquid supply tank 200.

When a certain amount of treated water is supplied into the backwashing liquid supply tank 200, the backwashing liquid supply tank stirrer 20 installed in the backwashing liquid supply tank 200 detects and transmits an electric signal to the controller C, which is sucked again. The pump 170 is delivered to stop the suction pump 170. Thereafter, the detergent of the detergent storage tank 210 installed at one side of the backwash liquid supply tank is transferred to the backwash liquid supply tank 200 by the detergent transfer pump 212 for a predetermined time.

The backwashing liquid made by mixing the treated water and the cleaning agent in the backwashing liquid supply tank 200 is backwashed through the backwashing liquid supply tank 200 and the backwashing liquid injection line L4 by the forced pumping of the backwashing pump 204. As the injection opening / closing valve 206 opens and enters the membrane unit 160 and exits through the pores from the inside of the separator and exits to the outside of the separator, the blockage material deposited on the membrane surface is detached from the membrane surface to eliminate the blockage. Apart from the regular backwash, which is conducted at least once a week, when the differential pressure gauge 220 installed in the suction line L1 rises above the predetermined differential pressure level, which is increased due to the blockage of the separator, the controller An electrical signal can be sent to (C) to cause a backwash, similar to the above-described process.

Unlike backwashing at least once a week, in-line cleaning (CIP; cleaning in place) is performed at least once every two to three months. The other process is the same as backwashing, but the operation of the cleaning agent transfer pump 212 is performed. The difference is that the time is longer than the backwashing information, so that the concentration of backwashing liquid in the backwashing liquid supply tank 200 is higher. Through back-washing and in-line cleaning as described above, the blockage of the membrane unit 160 may be completely prevented or eliminated.

In order to completely remove phosphorus in preparation for the change of raw water concentration, a flocculant injection tank may be separately installed and the coagulant may be added to the reaction tank to aggregate and remove the phosphorus.

In order to check whether the entire process is running smoothly, the field equipment, MCC control panel, and controller are connected to communication lines such as the Internet so that the operation status of the site can be checked on the Internet. Can be.

Figure 1 shows a backwash prevention device and method of a highly advanced membrane separation apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110: flow rate adjustment tank 112: raw water feed pump

120: drum screen 122: distribution tank

130: anaerobic tank 140: anaerobic tank

150: aerobic tank 160: membrane unit

162: treatment water opening and closing valve 164: backwash liquid supply opening and closing valve

170: suction pump 180: Brow

190: degassing tank 200: backwash liquid supply tank

204: backwash pump 206: backwash liquid injection opening and closing valve

210: detergent storage tank 220: differential pressure gauge

L1: Suction line L2: Treatment water line

L3: Backwashing liquid supply line L4: Backwashing liquid injection line

Claims (3)

In the advanced membrane separation apparatus for treating sewage and wastewater, Separation membrane unit 160 for selectively filtering the sewage and wastewater according to the size of the particles; A suction line (L1) connected to the separator unit; A suction pump 170 connected to the suction line so as to communicate with the separation membrane unit to solid-liquidly separate the mixed liquid introduced into the separation membrane by the suction pressure by the suction pressure to discharge the treated water to the outside; A differential pressure gauge (220) installed in the suction line and detecting a pressure of the treated water flowing into the suction line when the suction pump is operated; A treated water line (L2) connected to the suction pump and sending the treated water separated into a liquid through a suction pump to a specific place; A treatment water opening / closing valve (162) installed in the treatment water line to control discharge of the treatment water to the outside; A backwashing liquid supply line L3 branched from the treated water line; A backwashing liquid supply tank 200 connected to one side of the backwashing liquid supply line; A backwashing liquid supply opening / closing valve 164 installed in the backwashing liquid supply line to control backwashing liquid flowing into the backwashing liquid supply tank; A backwashing liquid injection line (L4) formed between the backwashing liquid supply tank and the separator frame device; A backwash pump 204 installed in the backwash solution injection line for forcibly injecting the backwash solution into the membrane unit; A backwash solution injection opening / closing valve (206) interposed between the backwash pump and the separation membrane unit for intermittent injection of backwash solution; A detergent storage tank 210 connected to the backwashing supply tank and supplying a cleaner by a cleaner transfer pump provided at one side; Occlusion prevention device of the membrane separation device for advanced processing, characterized in that consisting of. In the advanced membrane separation apparatus for treating sewage and wastewater, Separation membrane unit 160 for selectively filtering the sewage and wastewater according to the size of the particles; A suction line (L1) connected to the separator unit; A suction pump 170 connected to the suction line so as to communicate with the separation membrane unit to solid-liquidly separate the mixed liquid introduced into the separation membrane by the suction pressure by the suction pressure to discharge the treated water to the outside; A differential pressure gauge (220) installed in the suction line and detecting a pressure of the treated water flowing into the suction line when the suction pump is operated; A treated water line (L2) connected to the suction pump and sending the treated water separated into a liquid through a suction pump to a specific place; A treatment water opening / closing valve (162) installed in the treatment water line to control discharge of the treatment water to the outside; A backwashing liquid supply line L3 branched from the treated water line; A backwashing liquid supply tank 200 connected to one side of the backwashing liquid supply line; A backwashing liquid supply opening / closing valve 164 installed in the backwashing liquid supply line to control backwashing liquid flowing into the backwashing liquid supply tank; A backwashing liquid injection line (L4) formed between the backwashing liquid supply tank and the separator frame device; A backwash pump 204 installed in the backwash solution injection line for forcibly injecting the backwash solution into the membrane unit; A backwash solution injection opening / closing valve (206) interposed between the backwash pump and the separation membrane unit for intermittent injection of backwash solution; A detergent storage tank 210 connected to the backwashing supply tank and supplying a cleaner by a cleaner transfer pump provided at one side; The treated water opening and closing valve, backwash liquid supply opening and closing valve, backwash liquid injection opening and closing valve, cleaning material conveying pump, backwash liquid supply tank stirrer, a high pressure comprising a controller for automatically adjusting the differential pressure gauge by an electrical signal Blocking device for processing membrane separation device. Closing the treated water opening / closing valve of the treated water line while the suction pump and the broa are operated, and opening the backwashed liquid supply opening / closing valve installed in the backwashing liquid supply tank line to transfer the treated water to the backwashing liquid supply tank; Stopping the suction pump by detecting a backwashing liquid supply tank stirrer installed in the backwashing liquid supply tank and transmitting an electric signal to the controller when the amount of treated water is supplied into the backwashing liquid supply tank; After the suction pump is stopped, the detergent transfer pump is operated to transfer a predetermined amount of the detergent contained in the detergent electric charge tank to the backwash solution supply tank; In the backwash solution supply tank, the backwash solution made by mixing the treated water and the cleaning agent flows into the separator unit through the backwash solution supply tank and exits through the pores from the inside of the separator to the outside of the separator. A blockage preventing method of the membrane separation apparatus for advanced processing, characterized in that it comprises a; step of eliminating the blockage from being removed.

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