I want to know, what are the common sense in the use of household reverse osmosis membranes?

Avoid direct sunlight.

First of all, pay attention to one is the preparation of cleaning solution, which and activated carbon rods constitute the pretreatment of reverse osmosis, reverse osmosis membrane rarely has the possibility of discoloration, household membrane cleaning is not very cost-effective, 2, daily use, can only be used for a few more months. 2012 three, 2, the membrane after one hour of operation of the permeate water needs to be discharged. Before using it for the first time, the optional range is basically only 1812, because even if it is cleaned, please drain the sewage in time, if you want to self-prime the pump, buy a bottle and go home and follow the operation steps written above to clean it.

In the case of household reverse osmosis membranes, it prevents biological growth. Limited water production capacity, 2. Good chemical stability: pH2-11.

Remember to rinse for 1 hour. You check it about every 3-6 months, if the filter element is found to be badly fouled, the range of options is limited, 2012 several, warm tips: The wet film contains a protective solution (food grade), precautions 1, the box of the storage membrane element needs to be stored at room temperature.

Please use the connector on the original machine.

At present, the reverse osmosis membrane used in household machines needs to add a new protective solution (sodium bisulfite) to the bag, which can be replaced regularly. 3. When the storage, transportation and system are out of operation. Like any other filter element in a water machine, it can cause the reverse osmosis membrane to clog. Only RO membranes can be filtered out.

There is also to prepare some tools, polluted heavy metal ions, RO reverse osmosis membrane is the core component of the water purifier, water alkali scale, because there is a PPF filter element in front of the reverse osmosis membrane, the membrane shell, basically only 1812, if the polyethylene bag is damaged, the reverse osmosis membrane is not dirty or blocked. The reverse osmosis membrane used, Product features: 1. High water flux and high desalination rate.

Household machines, if you clean them yourself, 1810, the new machine produces 50 or 75g (gallons) of water per day. Most of the water yields are 50 or 75 g (gallons). To replace it in time, it is not a single product in the whole water machine.

Generally, let the seller clean or buy a new one for you, seal it to avoid air drying, and recommend a brand to you Korea Sehan Let him provide information related to reverse osmosis membrane 1, certificate of origin 2, certificate of conformity 3, operating instructions. There is nothing that requires special maintenance in conventional use, and it should not be used beyond the time limit to avoid causing the failure of other parts of the whole machine. If the pretreatment filter element in front of the pipeline is not replaced frequently, pure water No. 1 water treatment will answer for you:

Now there is a reverse osmosis membrane cleaning agent on the market, 3. Replace a single membrane element without a joint, it is only used as a part of the water machine to filter out impurities and purify water quality, as the name suggests, it is only suitable for home use

1. Drammel reverse osmosis membrane must be stored at room temperature and cannot be stored in direct sunlight.

2. If the polyethylene bag is damaged, a new preservative solution (sodium bisulfite) must be added and sealed airtightly to prevent drying and microbial growth.

3. In the first hour of operation, the flushed out anticorrosive liquid wastewater should be discharged.

4. All membrane elements have been strictly tested before leaving the factory, and the sodium bisulfite solution (10 propylene glycol antifreeze should be added in winter) solution is used for storage treatment, and the vacuum packaging is used, and the outer packaging is a cardboard box.

2.The principle of reverse osmosis:

The first thing to understand is the concept of osmosis. Osmosis is a physical phenomenon. When two kinds of water containing different salts, such as separating a semi-permeable membrane, it will be found that the water on the side with less salt content will seep through the membrane into the water with high salt content, and the salt content will not permeate, so that the salt concentration on both sides will gradually merge until it is equal.

However, it takes a long time to complete this process, which is also known as osmotic pressure. However, if a pressure is added on the side of the water with high salt content, the result can also stop the above-mentioned osmosis, and the pressure at this time is called osmotic pressure. If the pressure is increased further, it can penetrate in the opposite direction, and the salt remains.

Therefore, the principle of reverse osmosis desalination is to apply a greater pressure than the natural osmotic pressure in the saline water (such as raw water), so that the osmosis is carried out in the opposite direction, and the water molecules in the raw water are pressed to the other side of the membrane to become clean water, so as to achieve the purpose of removing impurities and salts in the water.

The origin of reverse osmosis: In 1950, American scientists once accidentally found that seagulls sipped a large mouthful of seawater from the surface of the sea when flying at sea, and after a few seconds, spit out a small mouthful of seawater, and doubted, because animals on land breathed by the lungs could never drink high-salt seawater. After dissection, it was found that there is a thin film in the seagull's body, which is very precise, the seawater is inhaled into the body by the seagull and pressurized, and then the water molecules penetrate through the membrane through the pressure action to convert into fresh water, and the seawater containing impurities and highly concentrated salts is spit out of the mouth, which is the basic theoretical framework of the reverse osmosis method. And in 1953, it was applied to seawater desalination and salt removal equipment by the university, and in 1960, with the support of the United States federal ** project, the professor of the American University School of Medicine began to study the reverse osmosis membrane, and invested about 400 million US dollars a year in research to apply it to astronauts, so that the spacecraft did not have to carry a large amount of drinking water into the air, until 1960, more and more scholars and experts were put into the research work, so that the quality and quantity were more sophisticated. Thus solving the problem of human water use.

The working principle of the reverse osmosis purifier is that the raw water passes through a fine filter, a granular activated carbon filter, a compressed activated carbon filter, etc., and then pressurized by a pump, and uses a reverse osmosis membrane (RO membrane) with a pore size of 1 10000 m (equivalent to 1 6000 of the size of E. coli and 1 300 of the virus) to make the higher concentration of water become low concentration water, and at the same time isolate all the impurities mixed into the water such as industrial pollutants, heavy metals, bacteria, viruses, etc. In order to meet the physical and chemical indicators and health standards stipulated by drinking, and produce pure and pure water, it is the best choice for the human body to replenish high-quality water in time. Because the purity of the water produced by RO reverse osmosis technology is the highest among all the water production technologies currently mastered by human beings, and the cleanliness reaches almost 100%, people call this water production machine reverse osmosis purified water machine.

How to judge the quality of reverse osmosis membrane?

Generally speaking, the main indicators to measure the performance of reverse osmosis membranes are composed of three indicators: ** rate, water yield and flux, and desalination rate.

Reverse osmosis membrane performance index 1: ** rate

**Rate is an important indicator of the energy efficiency of the reverse osmosis membrane element or reverse osmosis system, which is used to indicate how much of the influent water entering the membrane element has become product water, which is expressed by the formula: ** rate = product water flow rate (pure water outflow) inlet water flow.

Performance index of reverse osmosis membrane 2: water yield and its flux

Water yield is an indicator that indicates the volume of pure water produced by the reverse osmosis membrane per unit time under certain pressure conditions. The most common units of measurement are GPD (gallons per day) and LPH (liters per hour). Flux is the volume of water per unit area of reverse osmosis membranes that can be produced per unit of time, and is generally expressed in gallons square foot-days (gfd and cubic meters per square meter day).

Membrane element water yield = flux effective membrane area.

Reverse osmosis membrane performance index 3: desalination rateThe removal rate of reverse osmosis membrane elements for different substances is different, and in general, there are the following rules:

1.The removal rate of multivalent ions is higher than that of monovalent ions; The removal rate of complex ions is higher than that of simple ions; The removal rate of organic matter below the molecular weight of 100 is low; The removal rate of nitrogen group elements and their compounds is low.

2.The desalination rate is expressed as the apparent desalination rate and the actual desalination rate. Apparent desalination rate = 1 - salt content of produced water Salinity content of influent water.

Actual desalination rate = 1-2 salt content of produced water (salt content of influent water + salt content of wastewater) 2 a, where a represents the concentration difference polarization coefficient (generally between).

Wanda Environmental Protection teaches you how to choose the RO membrane on the water purification equipment: RO membrane, also known as reverse osmosis membrane, is the core element to achieve reverse osmosis, generally made of polymer materials. The diameter of the surface pores is generally between, and the magnitude of permeability is related to the chemical structure of the membrane itself.

1. When looking at the membrane, you should observe whether the membrane is complete and fresh, because some external factors may make the RO reverse osmosis membrane incomplete.

2. Smell production and external factors will make the membrane deteriorate, and some will emit a strange smell, if it is not stored properly for a long time, it will also make the RO reverse osmosis membrane have a certain impact.

3. Inspection. This is one of the best ways to identify RO reverse osmosis membranes. The water that really comes out through the RO reverse osmosis membrane has no impurities, no salt, and no minerals.

The brands of membranes on the market are uneven, and it is recommended to consult professional water purification equipment manufacturers.

Salt rejection rate is an important basis for judging the quality of reverse osmosis membrane, reverse osmosis membrane is a semi-permeable membrane that can filter impurities, the size of impurities in the water is different, many impurities are even small enough to exist in the state of ions, these ions are classified as "salt substances" in the chemical concept, and the role of reverse osmosis membrane is to remove these salt substances, this process is called desalination, and "desalination rate" represents the effect of desalination. Good products naturally have a high rate of salt rejection.

Desalination rate of reverse osmosis membrane = (total feed water salt content - total permeate salt content) Total feed water salt content 100%. The desalination rate of the membrane can reach 98%. This means that the impurities in the water will basically be filtered out by the membrane, and the effluent will meet the standard for use.

What is the material of reverse osmosis membrane?

What are the different materials of reverse osmosis membrane? Common reverse osmosis membrane materials are two categories: cellulose acetate reverse osmosis membrane and composite reverse osmosis membrane.

Mesh cellulose acetate reverse osmosis membrane elements.

Generally, cellulose is esterified to form triacetate fiber, and then hydrolyzed into a mixture by secondary hydrolysis.

One, two, and three acetate. The most important factor affecting the desalination rate and water yield of the membrane is that the high acetyl content is the high desalination rate, but the water yield is low.

The inherent weakness of cellulose acetate membranes is that over time, the ester functional groups will be hydrolyzed, while the desalination rate will gradually decrease and the flow rate will increase, and as the hydrolysis intensifies, the membrane will be more susceptible to microbial invasion, and the membrane itself will lose its function and integrity.

Composite reverse osmosis membrane elements.

The main supporting structure of the composite film is the polyester non-woven fabric after calendering by the calendering machine, its surface has no loose fibers and is hard and smooth, because the polyester non-woven fabric is very irregular and too loose, it is not suitable as the bottom layer of the salt barrier layer, so the microporous engineering plastic polysulfone is poured on the surface of the non-textile fabric, the pores on the surface of the polysulfone layer are controlled at about 15nm, and the barrier layer is made of aromatic polyamide with high cross-linking, and the thickness is about. Highly crosslinked aromatic polyamides are polymerized from benzetriyl chloride and phenylenediamine.