Double-circulation disinfection system for hemodialysis water treatment

Abstract

A double-circulation disinfection system for hemodialysis water treatment relates to the field of water treatment and comprises a pretreatment system, a balanced reservoir, a constant pressure pump, a first-stage reverse osmosis membrane filtering mechanism and a second-stage reverse osmosis membrane filtering mechanism which are sequentially connected in series through a pipeline, a discharge port with a drain valve is arranged on the balanced reservoir, and the double-circulation disinfection system is characterized in that the constant pressure pump is connected with the first-stage reverse osmosis membrane filtering mechanism and the second-stage reverse osmosis membrane filtering mechanism. The disinfection system comprises a disinfectant disinfection system and a high-temperature disinfection system, and bypass pipelines with valves are connected in front of a water inlet valve at the water inlet end of the first-stage reverse osmosis membrane filtering mechanism and behind a water outlet valve at the water outlet end of the second-stage reverse osmosis membrane filtering mechanism. Compared with the prior art, the invention has the advantages of thorough sterilization and disinfection and effective removal of residual disinfectant.

Description

Technical Field

[0001] The invention relates to the field of water treatment, in particular to a double-circulation disinfection system for hemodialysis water treatment. Background Art

[0002] At present, the hemodialysis water treatment system of the hemodialysis profession mainly uses a large circulation pipeline to connect each hemodialysis machine in series when supplying dialysate (or dialysate concentrate) to each dialysis machine. When the pipeline needs to be disinfected or the dialysate in the circulating tube needs to be circulated, the circulating pump in the main unit drives the liquid circulation in the pipeline; Since the high-purity water for hemodialysis has extremely strict hygiene requirements, and the pipes in the hemodialysis water treatment system are at risk of breeding bacteria after being used for a period of time, the pipes need to be sterilized and disinfected regularly; The main methods of sterilization and disinfection are sterilization and disinfection with disinfectants and sterilization and disinfection with chlorine-containing acid water produced by acid hydrolysis production institutions. Firstly, sterilization and disinfection with a single disinfectant is prone to incomplete sterilization and disinfection, and the reverse osmosis membrane cannot be disinfected to avoid damage to the reverse osmosis membrane. Secondly, after disinfection, even if the pipes are flushed with ultrapure water first, there will be residual disinfectant during initial use. Summary of the invention

[0003] The object of the present invention is to provide a double-circulation disinfection system for hemodialysis water treatment which can sterilize and disinfect thoroughly and effectively remove residual disinfectant.

[0004] The double-circulation disinfection system for hemodialysis water treatment of the present invention is implemented in this way, including a pretreatment system, a balancing water tank, a primary reverse osmosis membrane filtration mechanism with a first constant pressure pump, and a secondary reverse osmosis membrane filtration mechanism with a second constant pressure pump, which are sequentially connected together through pipelines. The balancing water tank is provided with a discharge port with a discharge valve, and includes a disinfection system. The disinfection system is special in that the disinfection system includes a disinfectant disinfection system and a high-temperature disinfection system. The disinfectant disinfection system includes a disinfectant delivery device. A valve is provided between the pretreatment system and the balancing water tank. The delivery port of the disinfectant delivery device is connected to the pipeline between the first constant pressure pump and the balancing water tank. The water inlet end of the primary reverse osmosis membrane filtration mechanism and the water outlet end of the secondary reverse osmosis membrane filtration mechanism are respectively provided with a water inlet valve and a water outlet valve. The front of the water inlet valve at the water inlet end of the primary reverse osmosis membrane filtration mechanism and the secondary reverse osmosis membrane A bypass pipe with a valve is connected behind the water outlet valve at the water outlet end of the filtering mechanism, a reflux pipe is connected between the water outlet valve at the water outlet end of the secondary reverse osmosis membrane filtering mechanism and the balancing water tank, a high-temperature disinfection system is one or more of a heating device arranged on the outside of the pipe behind the balancing water tank and a heating device arranged on the outside of the reflux pipe, a low-pressure water pump is arranged between the balancing water tank and the first constant-pressure water pump of the primary reverse osmosis membrane filtering mechanism, the low-pressure water pump is connected in series between the balancing water tank and the first constant-pressure pump, the water outlet of the low-pressure water pump is connected to the water inlet of the second constant-pressure pump through a first stop valve, the wastewater outlet of the primary reverse osmosis membrane filtering mechanism is connected to the reflux pipe through a second stop valve, the wastewater outlet of the secondary reverse osmosis membrane filtering mechanism is connected to the reflux pipe through a third stop valve, and a residual chlorine detection sensor for detecting residual chlorine in water and a temperature detection sensor for detecting water temperature are arranged on the reflux pipe; During disinfection, the disinfectant disinfection process is first carried out. Under the control of the control device, the water inlet valve, the water outlet valve and the valves between the pretreatment system and the balancing water tank are first closed, and the valve on the bypass pipe is opened. The disinfectant delivery device delivers disinfectant into the pipe, and the disinfectant is mixed into the water coming out of the balancing water tank, and flows back to the balancing water tank after passing through the constant pressure pump, the bypass pipe and the reflux pipe. When the amount of disinfectant in the water meets the requirements, the residual chlorine detection sensor transmits the detection signal to the control device, and the control device controls the disinfectant delivery device to stop delivering the disinfectant. After the water containing the disinfectant circulates for a period of time and the system is disinfected, the drain valve on the discharge port of the balancing water tank is opened. The valve is opened, and the water containing the disinfectant is discharged while the water treated by the pretreatment system is replenished until the water containing the disinfectant in the system is completely discharged. Then, under the control of the control device, close the valve and the drain valve, close the constant pressure pump, open the water inlet valve and the water outlet valve, close the first stop valve, open the second stop valve, start the heating device, and start the low-pressure pump until the water is heated to 80-90°C, and the high-temperature hot water flows through the primary reverse osmosis membrane filtration mechanism, the wastewater outlet of the primary reverse osmosis membrane filtration mechanism, the pipeline, the reflux pipeline, the balancing water tank and the constant pressure water pump and the corresponding pipelines for heating and disinfection; open the first stop valve, close the water inlet valve, and the high-temperature hot water flows through the secondary reverse osmosis membrane filtration mechanism, the wastewater outlet of the secondary reverse osmosis membrane filtration mechanism, the pipeline, the reflux pipeline, the balancing water tank and the constant pressure water pump and the corresponding pipelines for heating and disinfection; After disinfection is completed, open the drain valve on the discharge port to drain the hot water, and the hemodialysis centralized fluid supply system can be put into normal use after disinfection.

[0005] The technology of the present invention adopts a disinfectant disinfection system and a high-temperature disinfection system to disinfect the hemodialysis centralized fluid supply system. On the one hand, it can complete the disinfection of the primary reverse osmosis membrane filtration mechanism and the secondary reverse osmosis membrane filtration mechanism to solve the problem of incomplete sterilization by a single disinfection method. On the other hand, thermal disinfection is used to further remove residual disinfectants in the system.

[0006] Compared with the prior art, the invention has the advantages of thorough sterilization and disinfection and effective removal of residual disinfectant. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic structural diagram of the disinfection system of the hemodialysis water treatment double circulation disinfection system of the present invention.

[0008] Explanation of the reference numerals in the accompanying drawings: A-hemodialysis device; B-control device; 1-pipeline; 2-pretreatment system; 3-balance water tank; 4-constant pressure pump; 5-primary reverse osmosis membrane filtration mechanism; 6-secondary reverse osmosis membrane filtration mechanism; 7-drain valve; 8-discharge port; 9-disinfection system; 901-disinfectant disinfection system; 902-high temperature disinfection system; 10-valve; 11-inlet valve; 12-outlet valve; 13-valve; 14-bypass pipe; 15-reflux pipe; 16-low-pressure water pump; 17-first stop valve; 18-residual chlorine detection sensor; 19-temperature detection sensor; 20-diversion module; 21-additional heating device; 22-additional temperature detection sensor. DETAILED DESCRIPTION

[0009] The disinfection system of the hemodialysis water treatment double circulation disinfection system of the present invention is now described in further detail in conjunction with the accompanying drawings and embodiments: like Figure 1As shown, the disinfection system of the hemodialysis water treatment double-circulation disinfection system of the present invention is implemented as follows, including a pretreatment system 2, a balancing water tank 3, a constant pressure pump 4, a primary reverse osmosis membrane filtration mechanism 5, and a secondary reverse osmosis membrane filtration mechanism 6 which are sequentially connected in series through a pipeline 1, the pretreatment system 2 includes an ultrafiltration filter and an activated carbon filter, and a discharge port 8 with a discharge valve 7 is provided on the balancing water tank 3, the wastewater outlet of the primary reverse osmosis membrane filtration mechanism 5 is connected to the water inlet of the first constant pressure pump 4 of the primary reverse osmosis membrane filtration mechanism 5 through a first regulating valve 501, the wastewater outlet of the primary reverse osmosis membrane filtration mechanism 5 is discharged through a wastewater discharge valve 502, and the wastewater outlet of the secondary reverse osmosis membrane filtration mechanism 6 is connected to the water inlet of the second constant pressure pump 4 of the secondary reverse osmosis membrane filtration mechanism 5 through a second regulating valve 601, and includes a disinfection system 9; The special feature is that the disinfection system 9 includes a disinfectant disinfection system 901 and a high-temperature disinfection system 902. The disinfectant disinfection system 901 includes a disinfectant delivery device. A valve 10 is provided between the pretreatment system 2 and the balancing water tank 3. The delivery port of the disinfectant delivery device constituting the disinfectant disinfection 901 is connected to the pipe 1 between the constant pressure pump 4 and the balancing water tank 3. The water inlet end of the primary reverse osmosis membrane filtration mechanism 5 and the water outlet end of the secondary reverse osmosis membrane filtration mechanism 6 are respectively provided with an inlet valve 11 and a water outlet valve 12. A bypass pipe 14 with a valve 13 is connected in front of the inlet valve 11 at the inlet end of the primary reverse osmosis membrane filtration mechanism 5 and behind the water outlet valve 12 at the outlet end of the secondary reverse osmosis membrane filtration mechanism 6. The water outlet valve 12 at the outlet end of the secondary reverse osmosis membrane filtration mechanism 6 is connected to a reflux pipe 15 with the balancing water tank 3. The high-temperature disinfection system 902 is a heating device arranged on the outside of the pipeline 1 behind the balancing water tank 3 and a heating device arranged on the outside of the return pipe 15. A low-pressure water pump 16 is arranged between the balancing water tank 3 and the first constant-pressure water pump 4 of the primary reverse osmosis membrane filtration mechanism 5. The low-pressure water pump 16 is connected in series between the balancing water tank 3 and the first constant-pressure pump 4. The water outlet of the low-pressure water pump 16 is connected to the water inlet of the second constant-pressure pump 4 through a first stop valve 17. The wastewater outlet of the primary reverse osmosis membrane filtration mechanism 5 is connected to the return pipe 15 through a second stop valve 17. The wastewater outlet of the secondary reverse osmosis membrane filtration mechanism 6 is connected to the return pipe 15 through a third stop valve 17. A residual chlorine detection sensor 18 for detecting residual chlorine in water and a temperature detection sensor 19 for detecting water temperature are arranged on the return pipe 15. During disinfection, the disinfectant disinfection process is first carried out. Under the control of the control device B, the water inlet valve 11 and the water outlet valve 12 are first closed, the valve 10 between the pretreatment system 2 and the balancing water tank 3 is closed, and the valve 13 on the bypass pipe 14 is opened. The disinfectant delivery device constituting the disinfectant disinfection system 901 delivers disinfectant into the pipe 1. The disinfectant is mixed into the water coming out of the balancing water tank 3, and flows back to the balancing water tank 3 after passing through the constant pressure pump 4, the bypass pipe 14, and the reflux pipe 15. When the amount of disinfectant in the water meets the requirements, the residual chlorine detection sensor 16 transmits the detection signal to the control device B, and the control device B controls the disinfectant delivery device to stop delivering the disinfectant. After the water containing the disinfectant circulates for a period of time and the system is disinfected, the discharge valve 7 on the discharge port 8 of the balancing water tank 3 is opened, and the valve 10 is opened. While the water containing the disinfectant is discharged, the water treated by the pretreatment system 2 is replenished until the water containing the disinfectant in the system is completely discharged. Then, under the control of the control device B, the valve 13 and the drain valve 7 are closed, the first constant pressure pump and the second constant pressure pump 4 are closed, the water inlet valve 11 and the water outlet valve 12 are opened, the first stop valve 17 is closed, the second stop valve 17 is opened, the heating device 902 is turned on, and the low-pressure pump 16 is turned on until the water is heated to 80-90°C, and the high-temperature hot water flows through the primary reverse osmosis membrane filtration mechanism 5, the wastewater outlet of the primary reverse osmosis membrane filtration mechanism 5, the pipeline 1, the reflux pipeline 15, the balancing water tank 3 and the constant pressure water pump 4 and the corresponding pipelines for heating and disinfection; after the disinfection of the primary reverse osmosis membrane filtration mechanism 5 and the related pipelines is completed, the first stop valve 17 is opened, the water inlet valve 11 is closed, and the high-temperature hot water flows through the secondary reverse osmosis membrane filtration mechanism 6, the wastewater outlet of the secondary reverse osmosis membrane filtration mechanism 6, the pipeline 1, the reflux pipeline 15, the balancing water tank 3 and the constant pressure water pump 4 and the corresponding pipelines for heating and disinfection; After high-temperature disinfection of the primary reverse osmosis membrane filtration mechanism 5, the secondary reverse osmosis membrane filtration mechanism 6 and related pipelines, open the drain valve 7 on the discharge port 8 to drain the hot water. After disinfection, the hemodialysis centralized liquid supply system can be put into normal use to supply ultrapure water to the hemodialysis device.

[0010] Preferably, several sets of shunt modules 20 are connected along the pipeline 1 connected to the water outlet of the secondary reverse osmosis membrane filtration mechanism 6, and the shunt module 20 supplies ultrapure water to the hemodialysis device A. The pipeline 1 connected to the several sets of shunt modules 20 is provided with a first additional heating device 21 and a first additional temperature detection sensor 22. The control device B controls the operation of the first additional heating device 21 according to the temperature measurement signal of the first additional temperature detection sensor 22 to ensure that the temperature of the water in the pipeline 1 connected to the several sets of shunt modules 1 is maintained at the thermal disinfection temperature level.

[0011] Preferably, a second additional heating device 21 and a second additional temperature detection sensor 22 are provided at the return pipe 15 return balancing water tank 3, and the control device B controls the operation of the second additional heating device 21 according to the temperature measurement signal of the second additional temperature detection sensor 22 to ensure that the temperature of the water in the return pipe 15 return balancing water tank 3 is maintained at the thermal disinfection temperature level.

[0012] Due to the technical properties of the centralized liquid supply system, the pipe 1 outside the water outlet of the secondary reverse osmosis membrane filtration mechanism 6 is relatively long. Even if insulation measures are taken for the pipe 1, there will be temperature loss after the water flows through the pipe 1, resulting in the water temperature of the initially heated water being insufficient to complete the high-temperature disinfection of the entire system. This problem can be solved by using a pipe 1 connected with several sets of diversion modules 20 and provided with an additional heating device 21 and an additional temperature detection sensor 22. By heating the cooled water, it is ensured that the water has a sufficiently high temperature to disinfect the entire system.

Claims

1. A double-circulation disinfection system for hemodialysis water treatment, comprising a pretreatment system, a balancing water tank, a primary reverse osmosis membrane filtration mechanism with a first constant pressure pump, and a secondary reverse osmosis membrane filtration mechanism with a second constant pressure pump, which are sequentially connected together through pipelines, and a discharge port with a drain valve is provided on the balancing water tank, including a disinfection system, characterized in that: The disinfection system comprises a disinfectant disinfection system and a high-temperature disinfection system. The disinfectant disinfection system comprises a disinfectant delivery device. A valve is arranged between the pretreatment system and the balancing water tank. The delivery port of the disinfectant delivery device is connected to the pipeline between the first constant pressure pump and the balancing water tank. The water inlet end of the first-stage reverse osmosis membrane filtration mechanism and the water outlet end of the second-stage reverse osmosis membrane filtration mechanism are respectively provided with a water inlet valve and a water outlet valve. A bypass pipeline with a valve is connected in front of the water inlet valve at the water inlet end of the first-stage reverse osmosis membrane filtration mechanism and behind the water outlet valve at the water outlet end of the second-stage reverse osmosis membrane filtration mechanism. A reflux pipeline is connected between the water outlet valve at the water outlet end of the second-stage reverse osmosis membrane filtration mechanism and the balancing water tank. The high The temperature disinfection system is one or more of a heating device arranged on the outside of the pipeline behind the balancing water tank and a heating device arranged on the outside of the return pipeline. A low-pressure water pump is arranged between the balancing water tank and the first constant-pressure water pump of the primary reverse osmosis membrane filtration mechanism. The low-pressure water pump is connected in series between the balancing water tank and the first constant-pressure pump. The water outlet of the low-pressure water pump is connected to the water inlet of the second constant-pressure pump through a first stop valve. The wastewater outlet of the primary reverse osmosis membrane filtration mechanism is connected to the return pipeline through a second stop valve. The wastewater outlet of the secondary reverse osmosis membrane filtration mechanism is connected to the return pipeline through a third stop valve. A residual chlorine detection sensor for detecting residual chlorine in water and a temperature detection sensor for detecting water temperature are arranged on the return pipeline. During disinfection, the disinfectant disinfection process is first carried out. Under the control of the control device, the water inlet valve, the water outlet valve and the valves between the pretreatment system and the balancing water tank are first closed, and the valve on the bypass pipe is opened. The disinfectant delivery device delivers disinfectant into the pipe, and the disinfectant is mixed into the water coming out of the balancing water tank, and flows back to the balancing water tank after passing through the constant pressure pump, the bypass pipe and the reflux pipe. When the amount of disinfectant in the water meets the requirements, the residual chlorine detection sensor transmits the detection signal to the control device, and the control device controls the disinfectant delivery device to stop delivering the disinfectant. After the water containing the disinfectant circulates for a period of time and the system is disinfected, the drain valve on the discharge port of the balancing water tank is opened. The valve is opened, and the water containing the disinfectant is discharged while the water treated by the pretreatment system is replenished until the water containing the disinfectant in the system is completely discharged. Then, under the control of the control device, close the valve and the drain valve, close the constant pressure pump, open the water inlet valve and the water outlet valve, close the first stop valve, open the second stop valve, start the heating device, and start the low-pressure pump until the water is heated to 80-90°C, and the high-temperature hot water flows through the primary reverse osmosis membrane filtration mechanism, the wastewater outlet of the primary reverse osmosis membrane filtration mechanism, the pipeline, the reflux pipeline, the balancing water tank and the constant pressure water pump and the corresponding pipelines for heating and disinfection; open the first stop valve, close the water inlet valve, and the high-temperature hot water flows through the secondary reverse osmosis membrane filtration mechanism, the wastewater outlet of the secondary reverse osmosis membrane filtration mechanism, the pipeline, the reflux pipeline, the balancing water tank and the constant pressure water pump and the corresponding pipelines for heating and disinfection; After disinfection is completed, open the drain valve on the discharge port to drain the hot water, and the hemodialysis centralized fluid supply system can be put into normal use after disinfection.

2. The hemodialysis water treatment double circulation disinfection system according to claim 1, characterized in that: Several sets of shunt modules are connected along the pipeline connected to the water outlet of the secondary reverse osmosis membrane filtration mechanism. The shunt modules supply ultrapure water to the hemodialysis device. The pipeline connected to the several sets of shunt modules is provided with a first additional heating device and a first additional temperature detection sensor. The control device controls the operation of the first additional heating device according to the temperature measurement signal of the first additional temperature detection sensor to ensure that the temperature of the water in the pipeline connected to the several sets of shunt modules is maintained at the thermal disinfection temperature level.

3. The double-circulation disinfection system for hemodialysis water treatment according to claim 2, characterized in that: A second additional heating device and a second additional temperature detection sensor are provided at the return balancing water tank in the return pipe. The control device controls the operation of the second additional heating device according to the temperature measurement signal of the second additional temperature detection sensor to ensure that the temperature of the water in the return balancing water tank in the return pipe is maintained at the thermal disinfection temperature level.

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