Membrane integrated treatment equipment for pipeline direct drinking water

Abstract

The invention discloses membrane integrated treatment equipment for pipeline direct drinking water, which is integrated skid-mounted equipment, has the treatment capacity of 1-5 m < 3 > / h, and mainly comprises a tap water inlet unit, an inorganic ceramic membrane treatment unit, an organic nanofiltration membrane treatment unit, an organic degassing membrane treatment unit and an auxiliary unit which are compactly integrated in an integrated equipment frame. According to the membrane integrated treatment equipment for the pipeline direct drinking water, the intrinsic safety of the pipeline direct drinking water is realized, the taste of the pipeline direct drinking water is improved, the service life of a whole pipeline direct drinking water membrane system (a ceramic membrane, a nanofiltration membrane and a degassing membrane) is prolonged, and the membrane integrated treatment equipment for the pipeline direct drinking water has the advantages of safety, reliability, instant use and low maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of drinking water treatment technology, and more specifically to a membrane integrated treatment equipment for piped direct drinking water. Background Technology

[0002] As people's requirements for the quality of drinking water increase, piped drinking water systems are gradually becoming more common in people's daily lives, offering numerous advantages, including ease of use, safety and hygiene, and excellent water quality. The mainstream piped drinking water technologies on the market include activated carbon, sand filtration, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, ultraviolet light, and ozone. However, combinations of these technologies also have some drawbacks, such as high investment costs and cumbersome replacement of consumables.

[0003] Traditional membrane treatment technology, as a key component of piped drinking water systems, plays a crucial role in removing impurities, retaining microorganisms, heavy metals, and dissolved salts from tap water. However, it also has some drawbacks, such as stringent requirements for influent water quality, the need for pretreatment devices, low water recovery rates, large footprint of decentralized membrane integrated equipment, and difficulties in cleaning and maintenance. Inorganic ceramic membrane treatment systems offer advantages such as high chemical stability, high mechanical strength, high temperature resistance, and resistance to microbial degradation; organic nanofiltration membranes have good retention effects on small-molecule organic matter and some divalent ions, and low energy consumption. CN202510446745 reports an integrated nanofiltration pipeline direct drinking water system with zero wastewater discharge and its control method. Through multi-stage filtration treatment measures, including a biological activated carbon tank and a nanofiltration membrane device, harmful substances in municipal water supply can be effectively removed. CN202411591752 reports a nanofiltration pipeline direct drinking water system with zero wastewater discharge, which has the following advantages: no wastewater is discharged outside the system during each process, effectively saving water resources; the ozone activated carbon circulation pipeline can also realize the activation and regeneration of biological activated carbon under control; the overall system operation is stable and the maintenance cost is low.

[0004] Therefore, developing new membrane integrated treatment equipment with characteristics such as low cost, intensive operation, maintenance-free operation, and high recovery rate for piped drinking water has become an inevitable trend. Summary of the Invention

[0005] The purpose of this invention is to provide a membrane integrated treatment equipment for piped drinking water, which solves the problems of large footprint, frequent operation and maintenance, and high investment costs of existing equipment, and achieves efficient and stable piped drinking water supply to meet the growing demand for high-quality piped drinking water.

[0006] The technical solution of this invention is as follows: A membrane integrated treatment equipment for piped drinking water, which is an integrated skid-mounted device with a treatment capacity of 1-5 m³. 3The system, operating at / h, mainly consists of a tap water inlet unit, an inorganic ceramic membrane treatment unit, an organic nanofiltration membrane treatment unit, an organic degassing membrane treatment unit, and auxiliary units. Each unit is compactly integrated within a single equipment frame, significantly reducing the floor space required and facilitating installation, commissioning, and maintenance. The tap water inlet unit mainly includes an inlet pipeline, an electric inlet regulating valve, a flow meter, and a level gauge. The tap water flow is regulated by the electric regulating valve, the flow meter monitors the inlet flow, and the tap water enters the inorganic ceramic membrane inlet buffer tank. The water level in the ceramic membrane inlet buffer tank is controlled by high and low liquid levels, with a low liquid level of 0.2 m and a high liquid level of 0.9 m. The inorganic ceramic membrane treatment unit mainly includes a ceramic membrane inlet buffer tank, a ceramic membrane low-pressure pump, a ceramic membrane high-pressure pump, a ceramic membrane backwashing pump, a ceramic membrane module with a heating sleeve, a ceramic membrane product water tank, ceramic membrane pipes and valves, and a ceramic membrane control system. Tap water enters the ceramic membrane feed buffer tank. The liquid level in the feed buffer tank is interlocked with the low-pressure pump of the ceramic membrane. When the liquid level in the feed buffer tank reaches 0.5-0.6 m, the low-pressure pump is turned on, operating at a pressure of 0.1-0.2 bar. After running for 10-15 minutes, the high-pressure pump is turned on, operating at a pressure of 0.4-0.6 bar. Tap water passes through the ceramic membrane module, and the resulting permeate enters the ceramic membrane permeate tank. The concentrate is discharged into the nearest rainwater well. By adjusting the opening of the permeate and concentrate valves, the permeate recovery rate of the ceramic membrane treatment unit is adjusted to ≥98%. After 10-15 days of operation, when the transmembrane pressure difference increases, operation is stopped, and the heating jacket is turned on, raising the temperature to 85-90°C. o C. The time is 1-2 hours. After natural cooling to room temperature, the ceramic membrane backwashing is started, the ceramic membrane concentrate is discharged from the system, and the inorganic ceramic membrane treatment unit is put back into use. The organic nanofiltration membrane treatment unit mainly includes a low-pressure nanofiltration membrane pump, a high-pressure nanofiltration membrane pump, a nanofiltration membrane module, a nanofiltration membrane permeate tank, nanofiltration membrane piping and valves, and a nanofiltration membrane control system. The liquid level in the ceramic membrane permeate tank is interlocked with the low-pressure nanofiltration membrane pump. When the liquid level in the ceramic membrane permeate tank reaches 0.5-0.6m, the low-pressure nanofiltration membrane pump is turned on, operating at a pressure of 0.2-0.3 bar. After running for 10-15 minutes, the high-pressure nanofiltration membrane pump is turned on, operating at a pressure of 0.6-1.0 bar. The ceramic membrane permeate passes through the nanofiltration membrane module, and the resulting permeate enters the nanofiltration membrane permeate tank. The nanofiltration membrane concentrate is discharged into a nearby rainwater well. By adjusting the opening of the nanofiltration membrane permeate and concentrate valves, the permeate recovery rate of the nanofiltration membrane treatment unit is adjusted to ≥95%. After 15-20 days of operation, the nanofiltration membrane is cleaned with a food-grade cleaning agent to restore the nanofiltration membrane flux.

[0007] The organic degassing membrane treatment unit mainly includes a degassing membrane transfer pump, a degassing membrane module, a vacuum system, a nitrogen replenishment system, and a degassing membrane control system. The liquid level in the nanofiltration membrane permeate tank is interlocked with the degassing membrane transfer pump. When the liquid level in the nanofiltration membrane permeate tank reaches 0.3-0.4 m, the degassing membrane transfer pump is activated at an operating pressure of 0.05-0.1 bar. The nanofiltration membrane permeate enters the degassing membrane module, and the vacuum system is activated, maintaining a vacuum level of no more than 50 torr to remove air from the nanofiltration membrane permeate. The resulting degassing membrane permeate enters a nitrogen-sealed water tank, where it is preserved with nitrogen. It is then transported to the end user via an external drinking water supply pump through a pipeline. The auxiliary units mainly include an external water supply nitrogen sealing tank, a water quality testing unit, an external water supply unit, and an interlocking automatic control unit; among them, the water quality testing unit includes pH value, conductivity (TDS), turbidity, residual chlorine, oxidation-reduction potential (ORP), etc.

[0008] Compared with existing technologies, this invention has the following significant advantages: First, the membrane integrated treatment equipment for piped drinking water integrates inorganic ceramic membranes, organic nanofiltration membranes, and organic degassing membranes, achieving efficient removal of various pollutants and dissolved oxygen from tap water, ensuring the inherent safety of piped drinking water and improving its taste. Second, the inorganic ceramic membrane in this piped drinking water membrane integrated treatment equipment includes heating and backwashing functions, periodically removing microorganisms and impurities attached to the surface of the ceramic membrane, reducing the pressure on the subsequent nanofiltration and degassing membranes, and extending the service life of the entire piped drinking water membrane system (ceramic membrane, nanofiltration membrane, and degassing membrane). Finally, this piped drinking water membrane integrated treatment equipment has the advantages of being safe and reliable, ready to use immediately, and having low maintenance costs. Detailed Implementation

[0009] Example 1

[0010] An integrated membrane treatment system for piped drinking water is a skid-mounted unit, mainly composed of a tap water inlet unit, an inorganic ceramic membrane treatment unit, an organic nanofiltration membrane treatment unit, an organic degassing membrane treatment unit, and auxiliary units. Taking a 2m³ / h centralized water supply system for a commercial complex as an example (suitable for 3-5 story commercial complexes, meeting the daily drinking water needs of 300-500 people, covering shops, office areas, and public drinking water points), the configuration and operation process of each unit are as follows: The flow rate of tap water is regulated to 2 m³ / h by an electric regulating valve. A flow meter monitors the inlet flow rate in real time. The tap water flows through a pipeline into an inorganic ceramic membrane buffer tank with a diameter of 1 m and a height of 1 m. A high / low level sensor inside the buffer tank controls the water level. When the level is below 0.2 m, the electric regulating valve automatically increases its opening to replenish water; when it is above 0.9 m, the valve automatically stops replenishing water. When the level in the buffer tank reaches 0.6 m, the low-pressure ceramic membrane pump is activated at 0.1 bar. After 10 minutes of operation, the high-pressure ceramic membrane pump is activated at 0.4 bar. The permeate produced by the tap water passing through the ceramic membrane module yields 1.96 m³ / h of water. 3 / h, enters the ceramic membrane permeate tank, 0.04 m 3 The concentrated water from the ceramic membrane is discharged into the nearest rainwater well. After the ceramic membrane system has been running continuously for 10 days, the low-pressure pump and high-pressure pump are stopped, the inlet and product water valves are closed, and the heating jacket is opened to heat the water inside the ceramic membrane module to 85°C. o C. Maintain this temperature for 1 hour, then turn off the heating jacket and allow it to cool naturally to room temperature. Turn on the ceramic membrane backwash pump to backwash the ceramic membrane module. During backwashing, the ceramic membrane concentrate is discharged from the system. After backwashing, the system returns to normal operation. The liquid level in the ceramic membrane permeate tank is interlocked with the nanofiltration membrane low-pressure pump. When the liquid level in the ceramic membrane permeate tank reaches 0.5 m, turn on the nanofiltration membrane low-pressure pump at an operating pressure of 0.2 bar. After running for 10 minutes, turn on the nanofiltration membrane high-pressure pump at an operating pressure of 0.6 bar. The ceramic membrane permeate passes through the nanofiltration membrane module, producing 1.9 m³ of permeate. 3 / h, enters the nanofiltration membrane permeate tank, 0.05 m 3 The nanofiltration membrane concentrate is discharged into the nearest rainwater well. After 15 days of operation, the nanofiltration membrane is cleaned with a food-grade cleaning agent to restore its flux. The liquid level in the nanofiltration membrane permeate tank is interlocked with the degassing membrane transfer pump. When the liquid level in the nanofiltration membrane permeate tank reaches 0.3 m, the degassing membrane transfer pump is turned on at an operating pressure of 0.05 bar. The nanofiltration membrane permeate enters the degassing membrane module, and the vacuum system is activated at a vacuum degree of 40 torr to remove air from the nanofiltration membrane permeate. The resulting degassing membrane permeate enters the nitrogen-sealed water tank, where it is preserved with nitrogen. It is then delivered to the end user via an external drinking water transfer pump.

[0011] Example 2 An integrated membrane treatment system for piped drinking water is a skid-mounted unit, mainly composed of a tap water inlet unit, an inorganic ceramic membrane treatment unit, an organic nanofiltration membrane treatment unit, an organic degassing membrane treatment unit, and auxiliary units. Taking a 5 m³ / h centralized water supply system in a school as an example (meeting the daily drinking water needs of 800-1000 students), the configuration and operation process of each unit are as follows: The flow rate of tap water is regulated to 5 m³ / h by an electric regulating valve. A flow meter monitors the inlet flow rate in real time. The tap water flows through a pipeline into an inorganic ceramic membrane buffer tank with a diameter of 2 m and a height of 1 m. A high / low level sensor inside the buffer tank controls the water level. When the level is below 0.2 m, the electric regulating valve automatically increases its opening to replenish water; when it is above 0.9 m, the valve automatically stops replenishing water. When the level in the buffer tank reaches 0.5 m, the low-pressure ceramic membrane pump is activated at 0.2 bar. After 15 minutes of operation, the high-pressure ceramic membrane pump is activated at 0.6 bar. The tap water passes through the ceramic membrane module, producing 4.9 m³ of permeate. 3 / h, enters the ceramic membrane permeate tank, 0.1m 3 / h of ceramic membrane concentrate is discharged into the nearest rainwater well; after the ceramic membrane system has been running continuously for 15 days, the low-pressure pump and high-pressure pump of the ceramic membrane are stopped, the inlet and product water valves are closed, and the heating jacket is opened to heat the water temperature inside the ceramic membrane module to 90°C. o C. Maintain this temperature for 2 hours, then turn off the heating jacket and allow it to cool naturally to room temperature. Turn on the ceramic membrane backwash pump to backwash the ceramic membrane module. During backwashing, the ceramic membrane concentrate is discharged from the system. After backwashing, the system returns to normal operation. The liquid level in the ceramic membrane permeate tank is interlocked with the nanofiltration membrane low-pressure pump. When the liquid level in the ceramic membrane permeate tank reaches 0.6 m, turn on the nanofiltration membrane low-pressure pump at a pressure of 0.2 bar. After running for 15 minutes, turn on the nanofiltration membrane high-pressure pump at a pressure of 1.0 bar. The ceramic membrane permeate passes through the nanofiltration membrane module, producing 4.85 m³ of permeate. 3 / h, enters the nanofiltration membrane permeate tank, 0.05 m 3 The nanofiltration membrane concentrate is discharged into the nearest rainwater well. After 20 days of operation, the nanofiltration membrane is cleaned with a food-grade cleaning agent to restore its flux. The liquid level in the nanofiltration membrane permeate tank is interlocked with the degassing membrane transfer pump. When the liquid level in the nanofiltration membrane permeate tank reaches 0.4 m, the degassing membrane transfer pump is turned on at an operating pressure of 0.1 bar. The nanofiltration membrane permeate enters the degassing membrane module, and the vacuum system is activated at a vacuum degree of 50 torr to remove air from the nanofiltration membrane permeate. The resulting degassing membrane permeate enters the nitrogen-sealed water tank, where it is preserved with nitrogen. It is then delivered to the end user via an external drinking water transfer pump.

[0012] Example 3 An integrated membrane treatment system for piped drinking water is a skid-mounted unit, mainly composed of a tap water inlet unit, an inorganic ceramic membrane treatment unit, an organic nanofiltration membrane treatment unit, an organic degassing membrane treatment unit, and auxiliary units. Taking a 3 m³ / h centralized water supply system for a residential building (meeting the daily drinking water needs of 150-200 households) as an example, the configuration and operation process of each unit are as follows: The flow rate of tap water is regulated to 3 m³ / h by an electric regulating valve. A flow meter monitors the inlet flow rate in real time. The tap water flows through a pipeline into an inorganic ceramic membrane buffer tank with a diameter of 1.5 m and a height of 1 m. The water level in the buffer tank is controlled by high and low level sensors. When the level is below 0.2 m, the electric regulating valve automatically increases its opening to replenish water; when it is above 0.9 m, the valve automatically stops replenishing water. When the water level in the buffer tank reaches 0.6 m, the low-pressure ceramic membrane pump is activated at an operating pressure of 0.15 bar. After 12 minutes of operation, the high-pressure ceramic membrane pump is activated at an operating pressure of 0.5 bar. The tap water passes through the ceramic membrane module, producing 1.45 m³ of permeate. 3 / h, enters the ceramic membrane permeate tank, 0.05 m 3 / h of ceramic membrane concentrate is discharged into the nearest rainwater well; after the ceramic membrane system has been running continuously for 13 days, the low-pressure pump and high-pressure pump of the ceramic membrane are stopped, the inlet and product water valves are closed, and the heating jacket is opened to heat the water temperature inside the ceramic membrane module to 88°C. o C. Maintain this temperature for 1.5 hours, then turn off the heating jacket and allow it to cool naturally to room temperature. Turn on the ceramic membrane backwash pump to backwash the ceramic membrane module. During backwashing, the ceramic membrane concentrate is discharged from the system. After backwashing, the system returns to normal operation. The liquid level in the ceramic membrane permeate tank is interlocked with the nanofiltration membrane low-pressure pump. When the liquid level in the ceramic membrane permeate tank reaches 0.55 m, turn on the nanofiltration membrane low-pressure pump at an operating pressure of 0.15 bar. After running for 13 minutes, turn on the nanofiltration membrane high-pressure pump at an operating pressure of 0.8 bar. The ceramic membrane permeate passes through the nanofiltration membrane module, producing 1.42 m³ of permeate. 3 / h, enters the nanofiltration membrane permeate tank, 0.08 m 3The nanofiltration membrane concentrate is discharged into the nearest rainwater well. After 18 days of operation, the nanofiltration membrane is cleaned with a food-grade cleaning agent to restore its flux. The liquid level in the nanofiltration membrane permeate tank is interlocked with the degassing membrane transfer pump. When the liquid level in the nanofiltration membrane permeate tank reaches 0.35 m, the degassing membrane transfer pump is turned on at an operating pressure of 0.08 bar. The nanofiltration membrane permeate enters the degassing membrane module, and the vacuum system is activated at a vacuum degree of 35 torr to remove air from the nanofiltration membrane permeate. The resulting degassing membrane permeate enters the nitrogen-sealed water tank, where it is preserved with nitrogen. It is then delivered to the end user via an external drinking water transfer pump.

[0013] Application effect: This shows that drinking water treated by membrane integrated treatment equipment for piped drinking water has significantly reduced hardness, removed residual chlorine and dissolved oxygen, and significantly improved water quality.

Claims

1. A membrane-integrated treatment equipment for piped drinking water, characterized in that: This equipment is an integrated skid-mounted unit with a processing capacity of 1-5 m³. 3 The system is mainly composed of a tap water inlet unit, an inorganic ceramic membrane treatment unit, an organic nanofiltration membrane treatment unit, an organic degassing membrane treatment unit, and auxiliary units. Each unit is compactly integrated into an integrated equipment frame.

2. A membrane-integrated treatment equipment for piped drinking water as described in claim 1, characterized in that: The aforementioned tap water inlet unit mainly includes an inlet pipeline, an electric inlet regulating valve, a flow meter, and a level gauge. The tap water flow rate is regulated by the electric regulating valve, the flow meter monitors the inlet flow rate, and the tap water is connected to an inorganic ceramic membrane inlet buffer tank. The water level in the ceramic membrane inlet buffer tank is controlled by the level gauge, with a low level of 0.2m and a high level of 0.9m.

3. A membrane-integrated treatment equipment for piped drinking water as described in claim 1, characterized in that: The inorganic ceramic membrane treatment unit mainly includes a ceramic membrane inlet buffer tank, a ceramic membrane low-pressure pump, a ceramic membrane high-pressure pump, a ceramic membrane backwash pump, a ceramic membrane module with a heating sleeve, a ceramic membrane permeate tank, ceramic membrane pipes and valves, and a ceramic membrane control system. Tap water enters the ceramic membrane inlet buffer tank, and the liquid level in the buffer tank is interlocked with the ceramic membrane low-pressure pump. When the liquid level in the buffer tank reaches 0.5-0.6 m, the low-pressure pump is activated at an operating pressure of 0.1-0.2 bar. After running for 10-15 minutes, the high-pressure pump is activated at an operating pressure of 0.4-0.6 bar. The tap water passes through the ceramic membrane module, and the resulting permeate enters the ceramic membrane permeate tank. The concentrate is discharged into a nearby rainwater well. The permeate recovery rate of the ceramic membrane treatment unit is adjusted by changing the opening of the permeate and concentrate valves. After 10-15 days of operation, when the transmembrane pressure difference increases, operation is stopped, and the heating jacket is turned on, raising the temperature to 85-90°C. o C, for 1-2 hours, allow to cool naturally to room temperature, then start the ceramic membrane backwashing, discharge the ceramic membrane concentrate from the system, and the inorganic ceramic membrane treatment unit can be put back into use.

4. A membrane-integrated treatment equipment for piped drinking water as described in claim 1, characterized in that: The organic nanofiltration membrane treatment unit mainly includes a nanofiltration membrane low-pressure pump, a nanofiltration membrane high-pressure pump, a nanofiltration membrane module, a nanofiltration membrane permeate tank, nanofiltration membrane pipes and valves, and a nanofiltration membrane control system. The liquid level in the ceramic membrane permeate tank is interlocked with the nanofiltration membrane low-pressure pump. When the liquid level in the ceramic membrane permeate tank reaches 0.5-0.6m, the nanofiltration membrane low-pressure pump is turned on, with an operating pressure of 0.2-0.3 bar. After running for 10-15 minutes, the nanofiltration membrane high-pressure pump is turned on, with an operating pressure of 0.6-1.0 bar. The ceramic membrane permeate passes through the nanofiltration membrane module, and the resulting nanofiltration membrane permeate enters the nanofiltration membrane permeate tank. The nanofiltration membrane concentrate is discharged into the nearest rainwater well. By adjusting the opening of the nanofiltration membrane permeate and concentrate valves, the permeate recovery rate of the nanofiltration membrane treatment unit is adjusted to ≥95%. After 15-20 days of operation, the nanofiltration membrane is cleaned with a food-grade cleaning agent to restore the nanofiltration membrane flux.

5. A membrane-integrated treatment equipment for piped drinking water as described in claim 1, characterized in that: The organic degassing membrane treatment unit mainly includes a degassing membrane delivery pump, a degassing membrane assembly, a vacuum system, a nitrogen replenishment system, and a degassing membrane control system. The liquid level in the nanofiltration membrane permeate tank is interlocked with the degassing membrane delivery pump. When the liquid level in the nanofiltration membrane permeate tank reaches 0.3-0.4 m, the degassing membrane delivery pump is turned on, with an operating pressure of 0.05-0.1 bar. The nanofiltration membrane permeate enters the degassing membrane assembly, and the vacuum system is activated, with a vacuum degree not exceeding 50 torr, to remove air from the nanofiltration membrane permeate. The resulting degassing membrane permeate enters the nitrogen-sealed water tank, where it is preserved with nitrogen. It is then delivered to the end user via an external drinking water delivery pump through a pipeline.

6. A membrane-integrated treatment equipment for piped drinking water as described in claim 1, characterized in that: The auxiliary unit mainly includes an external water supply nitrogen sealing tank, a water quality testing unit, an external water supply unit, and an interlocking automatic control unit; among which, the water quality testing unit includes pH value, conductivity (TDS), turbidity, residual chlorine, oxidation-reduction potential (ORP), etc.