Ultra-pure water equipment of low pressure flushing process

· 　　 The cleaning problem of ultra- pure water machine or ultra-pure water equipment may cause losses for many users with weak technical strength, so to manage the reverse osmosis equipment, serious problems can be avoided.

· In order to ensure the performance of the ultra- pure water machine , the user should do the maintenance work of the filter equipment. Wright Rader Environmental Engineering Co., Ltd. recommends starting from these aspects: long-term use, the filter must be cleaned, the filter element is unplugged, washed and dried, sealed with plastic bags, not contaminated, ultra-pure water machine filter cleaned, do not damage . The replaced filter element should be immersed in the acid-base wash solution, the soaking time should not exceed 24 hours, and the acid-base temperature should generally be 25 °C - 50 °C. It is recommended that the acid or alkali to water ratio is 10-20%. The filtrate with high protein content and the filter element are preferably soaked in the enzyme solution. The cleaning effect is good, and the product should be cleaned and then steamed. The cleaning and disinfection is very important for the pure water machine filter and the drying filter.

· Filter core disinfection should pay attention to master the time and temperature, polypropylene in the high temperature disinfection cabinet with 121 ° C is appropriate, with steam sterilization at 0.1MPa steam pressure, 130 ° C / 20 minutes is appropriate, polysulfone and polytetrafluoroethylene Sterilize with steam and clean with glassware. It can reach 142 ° C, pressure 0.2 MPa, time is about 30 minutes is appropriate, if the temperature is too high, the time is too long, the pressure is too large, it will damage the filter element.

1. Low pressure flushing reverse osmosis equipment

Regular high-flow, low-pressure, low-pH flushing of reverse osmosis equipment is beneficial to remove dirt adhering to the surface of the membrane, maintain membrane performance, or when the SDI of the reverse osmosis equipment suddenly rises above 5.5, Perform low pressure flushing and turn the machine on after the SDI value is adjusted.

· 2. Reverse osmosis equipment outage protection

Due to fluctuations in production, reverse osmosis laboratory ultra-pure water machine equipment is inevitably required to be shut down frequently. Protective measures must be taken when decommissioning in the short or long term. Unsuitable handling will result in a decrease in membrane performance and unrecoverable.

Short-term storage is suitable for systems with a shutdown of 15d or less. The reverse osmosis equipment can be protected by a low-pressure flushing method every 1~3d. It has been found that when the water temperature is above 20 °C, the water in the reverse osmosis equipment will be stinky after being stored for 3 days, and a large amount of bacteria will multiply. Therefore, it is recommended to flush the water every 2d or 1d when the water temperature is higher than 20°C. When the water temperature is lower than 20°C, it can be washed once every 3d. After each flush, all the inlet and outlet valves on the reverse osmosis unit of the water purification equipment should be closed. . Long-term deactivation protection is applicable to systems that have been out of service for more than 15 days. In this case, the protective liquid (biocide) must be filled with the reverse osmosis unit of the water purification equipment for protection.

· 3. Reverse osmosis membrane chemical cleaning

　　 Ultrapure water equipment under normal operating conditions, the reverse osmosis membrane fouling may also be inorganic, colloid, microbial, metal oxides and other pollutants, these substances are deposited on the membrane surface of a reverse osmosis water purification equipment means causes output decrease rate of desalination or The drop, the pressure difference is increased, and even the membrane is irreparably damaged. Therefore, in order to restore good water permeability and desalination performance, the membrane needs to be chemically cleaned.

It is usually cleaned once every 3 to 12 months. If it has to be cleaned once a month, this indicates that the pretreatment system should be improved and the operating parameters adjusted. If it needs to be cleaned once in 1 to 3 months, it is necessary to improve the operation level of the equipment. It is difficult to judge whether it is necessary to improve the pretreatment system.

· RO pure water machine working principle:

· RO water purifier (or RO reverse osmosis pure water machine / RO water purifier) ​​is a water purifier that uses the principle of reverse osmosis technology for water filtration. RO reverse osmosis technology is the US government and NASA, to solve the universe. The problem of drinking water and water carrying capacity of astronauts in spacecraft has been widely used in military, medical, industrial, civil and other fields for a high-tech product that has been researched and developed over many years. Known as one of the six high-tech in the 20th century.

Working principle: Under a certain pressure, water molecules (H2O) can pass through the RO membrane, and inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses and other impurities in the source water cannot pass through the RO membrane, thereby allowing a part of water to pass through. The RO membrane is separated, and the unpermeated water forms concentrated water due to the increase in solute.

The main separation object of the reverse osmosis membrane is the ions in the solution, and the salt in the water can be effectively removed without chemicals, and the system salt removal rate is generally 98% or more.

Reverse osmosis is the most advanced and energy-saving, environmentally friendly method of desalination, and has become the mainstream pre-desalting process.

Generally, the pure water hardness of the household pure water mechanism can be less than 12 for TDS; the industrial use can be less than 1; the core of the RO pure water machine is RO film, and the best RO film is currently recognized as the Dow film made in the United States.