Sichuan Pure Science And Technology Co., Ltd.

After the pure water treatment equipment has been running normally for a period of time, the reverse osmosis membrane element of the industrial pure water equipment will be contaminated by suspended matter or insoluble matter that may exist in the water supply, mainly including calcium carbonate scale, calcium sulfate scale, metal oxide scale, and silicon. Sediments and organic or biological sediments. Therefore, the redesigned water treatment system always needs to be cleaned, and the reverse osmosis system needs to be cleaned when the RO system has a tendency to contaminate, when it is put into use before and after long-term shutdown, or when routine maintenance is performed as planned. The system needs to be cleaned reasonably and timely, which is a necessary condition to ensure the stable operation of the system. When the following pollution characteristics appear: After standardization, the water production volume decreases by 10 to 15%; After standardization, the quality of produced water drops by 10 to 15%; And the pressure drop between feed water and concentrated water increases by 10-15%. At this time, the reverse osmosis system needs to be cleaned. The frequency of RO system cleaning due to fouling varies from location to location. Generally speaking, an acceptable cleaning frequency is every 3 to 12 months. If cleaning is required once a month, the RO pretreatment system needs to be improved and the RO system operating parameters adjusted. If cleaning is required from January to March every year, the operating level of the existing equipment needs to be improved. Reverse osmosis membrane elements and water supply pipelines are the main objects for cleaning of hemodialysis water treatment equipment; cleaning methods mainly include chemical cleaning and thermal disinfection.

The reverse osmosis system is a membrane separation technology developed in the 1960s. This technology has developed rapidly and has been widely used in fields such as water desalination and desalination, preparation of high-purity water and pure drinking water. Most reverse osmosis membranes have a pore size of 10×10-10m, and their separation objects are dissolved ions and organic matter with a molecular weight of several hundred or more.   A membrane that can only pass through solvent but not solute is often called an ideal semipermeable membrane. When a solvent and a solution (or two solutions of different concentrations) are placed on both sides of this membrane, the pure solvent will naturally pass through the semipermeable membrane and flow spontaneously to one side of the solution (or from a low solution to a high concentrated solution). This phenomenon is called osmosis. When the osmotic process reaches the surface of the solution, pressure is generated to counteract the tendency of the solvent to flow toward the solution, that is, equilibrium is reached. This pressure is called the osmotic pressure of the solution.   Osmotic pressure depends on the type, concentration and temperature of the solution and has nothing to do with the membrane itself. In this case, if an external pressure greater than the osmotic pressure is applied to the solution surface, the solvent will flow from the solution to the solvent side in the opposite direction to the original osmotic pressure. This phenomenon is called reverse osmosis. Any separation method that concentrates or purifies a solution based on this principle is generally called a reverse osmosis process.   Reverse osmosis is the reverse migration movement of osmosis. Mainly driven by pressure, the solvent is forced to separate from the solute through the interception of the semipermeable membrane. The higher the concentration of the solution, the greater the osmotic pressure. In the reverse osmosis process, the applied pressure must be much greater than the osmotic pressure of the solution, generally several times to nearly dozens of times, within the range allowed by the system and membrane strength.   When the aqueous salt solution comes into contact with the surface of the porous semipermeable membrane, a layer of water molecules is selectively adsorbed on the solution interface of the membrane. Under the action of reverse osmosis pressure, pure water flows out of the membrane through capillary action. And the pure water that forms the interface continuously flows out.   For the removal of organic matter, it belongs to the screening mechanism. Therefore, it is related to the molecular weight and shape of the organic matter. In the ultrafiltration range, membranes with larger pore sizes are generally used, which are called ultrafiltration membranes. The pore size of ultrafiltration membrane is 2-10 nanometers, while the pore size of reverse osmosis membrane is 0.3-2 nanometers. Therefore, reverse osmosis membrane filtration can better remove various bacteria, such as the smallest bacteria "Pseudomonas aeruginosa" (3000×10-10M); it can also filter out influenza viruses (800×10-10M), pyrogens (10-500×10-10m) and other viruses.

The micro-analysis ultrapure water machine adopts multi-function, fully automatic microcomputer PLC control, LCD wide-screen display and animation to display the water production workflow. It purifies tap water into laboratory grade three pure water and grade one ultrapure water that comply with the national standard GB/T6682-2008, and ensures the reliability of water quality through real-time online monitoring. It is an energy-saving and cost-effective laboratory ultrapure water. system.     Micro analysis ultrapure water machine features: The system has two water inlets, one for dual use, and can produce RO pure water and UP ultrapure water at the same time. The system has an automatic alarm function for consumable failures, and the language setting displays consumable replacement information. The whole machine adopts the integrated design of pretreatment and built-in water tank, which is beautiful and elegant and saves space. Microcomputer automatic control program design, LCD large screen Chinese liquid crystal display, intuitive display of operating status, touch keyboard operating system. The system has a dual-channel dual-display function that simultaneously monitors and displays RO pure water conductivity and UP ultrapure water resistance. The system has functions such as self-test, automatic ultrapure water circulation, water shortage alarm, automatic reset after power outage, automatic shutdown when full of water, ultra-low pressure protection, and automatic RO flushing. The system has four quantitative water inlet functions: 500ml, 1000ml, 2000ml, and 5000ml. Built-in 20-inch ultra-large capacity integrated injection preconditioner with automatic backwash function. Built-in 20L imported vacuum pressure water storage tank (NSF certified) to avoid secondary pollution caused by contact with air. Equipped with a 20-inch ultra-large capacity injection and purification column design, which has a longer service life. The built-in adjustable RO silent booster pump (CE certification) can operate continuously for more than 10,000 hours. Fully automatic quick-connect special faucet and 3M long special water pipe design, durable and easy to install.

Ultrapure water machines are roughly divided into four units: pretreatment, reverse osmosis, ion exchange and terminal ultrafiltration. Tap water first passes through a pretreatment device to remove larger particles, suspended solids and some organic matter in the water. Then it enters the reverse osmosis device to intercept and remove ionic substances and macromolecular substances (such as viruses, microorganisms, etc.) in the water. Afterwards, the ion exchange unit purifies and ultra-purifies the trace ions remaining after membrane removal, reducing the ion content in the water to trace levels. Finally, through ultraviolet and ultrafiltration technology, microorganisms, organic matter and pyrogens in ultrapure water can meet the requirements of various experimental applications. The stable operation of the ultrapure water machine requires keeping the performance of the systems at all levels in good condition. The ultrapure water machine adopts a multi-stage filtration mode. This increases the cost of using the ultrapure water machine. Here is a brief introduction to the approximate service life of each filter element. 1.PP cotton filter element Primary filtration of raw water mainly filters particles larger than 5u, such as sand, rust, rust, sludge, phosphorus pollution, slag, etc. Service life: 3-6 months. It is generally recommended to replace it once every 3 months in summer and every 6 months in winter.   2. Coconut shell activated carbon filter element It absorbs residual pesticides, fertilizers and other pollutants, ultimately rendering the water colorless and odorless. Service life: Replace once every 3-6 months.   3.Micro PP filter element It mainly filters particles and impurities with a diameter larger than 1u. Service life: 3-6 months.