Chiwatec reverse osmosis pure water equipment brief description: reverse osmosis pure water treatment

Water quality requirements for reverse osmosis equipment:

  • The highest SDI (15 minutes) of water intake <5
  • The highest turbidity of the incoming water is less than 1.0NTU
  • The highest free chlorine concentration in the influent water is less than 0.1ppm
  • Maximum temperature of inlet water<45℃
  • The highest Fe value in the influent water is less than 0.05ppm

Application range

  • Preparation of pure water and ultrapure water in electronics, industry, medicine, food and other industries;
  • Purification and preparation of water for textile and chemical industry;
  • Purification and preparation of water for food and beverages and brewing process water;
  • Useful substances, concentration and recovery of aqueous solutions in industrial production;
  • Pre-desalination treatment of make-up water for high-pressure boilers in power plants and other enterprises;
  • desalination of brackish water and seawater;
  • The pure water device is used as the first-level desalination equipment for the production of high-purity water.

mechanical filter

Function: The raw water first passes through a mechanical filter, and 12-24 mesh fine quartz sand is placed in the filter, so that the suspended impurities such as flocs and rust in the raw water are trapped in the process. Since the mechanical filter retains a large amount of suspended impurities during operation, in order to ensure the normal operation of the filter, the filter must be regularly flushed and backwashed.
Selection: choose FRP material (glass fiber reinforced plastic) container.
Control: The backwash operation of the mechanical filter adopts a manual controller, the filter should be cleaned once a day, and the cleaning time is 10-20 minutes.

Activated carbon filter

Function: This process adopts activated carbon filter, which is very important as the pretreatment of reverse osmosis device. The reverse osmosis system requires the influent index SDI≤5 and residual chlorine <0.1mg/L. In order to meet its influent requirements, it is necessary to further purify the raw water to make it meet the influent index of reverse osmosis. A carbon filter is installed in front of the reverse osmosis device, which has two main functions: 1. Absorb some organic matter in the water, and the adsorption rate is about 60%; 2. Absorb residual chlorine in the water. It adsorbs inorganic colloids, organic colloids and dissolved organic polymer impurities with a particle size of about 10-20 angstroms, as well as residual chlorine that is difficult to remove in sand filters. The reason why activated carbon can be used to adsorb active substances with a particle size of about tens of angstroms is that its structure has a large number of micropores and particle gaps with an average pore size of 20-50 angstroms. This structural feature of activated carbon makes its surface adsorption. The area can reach 500-2000m2/g. Since the molecular diameter of general organic matter is slightly less than 20-50 angstroms, activated carbon has a strong adsorption effect on organic matter. In addition, activated carbon has a strong dechlorination ability. Due to the strong oxidizing property of residual chlorine, residual chlorine and carbon react to generate carbon dioxide and -1-valent chloride ions, so only a small amount of carbon is lost, so activated carbon dechlorination Can be used for quite a long time. Activated carbon not only has the above functions, but also can remove peculiar smells and pigments in water, and improve the clarity of water. After activated carbon is used for a period of time, its adsorption capacity will decrease, and it needs to be regenerated or replaced. Therefore, after the raw water passes through the carbon filter, the water quality can be greatly improved and the pollution to the reverse osmosis membrane can be reduced.
Selection: Use glass fiber reinforced plastic container, the expansion rate is 40%.
Control: The control of the activated carbon filter adopts a manual controller. Since the activated carbon filter adsorbs a large amount of suspended impurities during operation, in order to ensure the normal operation of the system, flushing and backflushing must be carried out every day. 30 minutes.

Fully automatic water softener or dosing device

Function: The process of removing hardness (Ca2+, Mg2+) in water is called softening. The equipment is filled with 001×7 strong acid type Na ion exchange resin, and the calcium and magnesium ions in the raw water are replaced with sodium ions, so that the residual hardness in the raw water is lower than 0.03mmol/L. The purpose of softening is to prevent scaling on the surface of the reverse osmosis membrane, so as to prolong the service life and treatment efficiency of the reverse osmosis membrane.
Selection: The water softener is a glass fiber reinforced plastic container.
Control: The control system adopts the American automatic control valve type. According to the set time/flow, the control valve head can automatically regenerate the resin, complete the process of salt absorption and backwashing, and positive flushing. The water softener is equipped with a regeneration tank. The salt and water volume of the salt tank should be checked daily, and the salt should be replenished in time (the use of iodized salt and other salts with additives is prohibited).

Precision filter

Function: Precision filtration is also known as security filter. It is a treatment process before the raw water enters the reverse osmosis membrane device. The PP filter element has the characteristics of large filtration flow, large dirt holding capacity and small pressure loss. It can block impurity particles of different particle sizes, and integrates surface filtration and deep filtration. The precision filter is also blocked after a certain period of use. Therefore, the PP melt-blown filter element must be replaced after a certain period of time. The basis for replacement: the pressure difference before and after the precision filtration is replaced when the pressure difference is 0.05-0.1Mpa.
Selection: choose stainless steel container.

Reverse osmosis device

Function: The reverse osmosis device is the main part of the purified water production line. This device uses the energy-saving composite membrane ESPA type reverse osmosis membrane element produced by Nitto Denko Group and American Hyde Energy Company. ESPA series are brackish water desalination membranes with high desalination rate. High water flux can be obtained at lower operating pressure, with an average desalination rate of 99.5%.
Since ESPA membrane has the above advantages, it provides a wider space for the selection of supporting equipment such as water pumps, pressure vessels, pipes, and valves. And the use of smaller power motors can meet the needs of work. At the same time, the characteristics of high water flux and high salt rejection of ESPA membrane greatly reduce the equipment manufacturing cost and system equipment investment cost, and can save a lot of energy, reduce the operating cost of the system, and improve the water quality.
Selection: American Hyde Power ESPAI-4040/8040. The designed water temperature of the reverse osmosis device is 25°C, and the water utilization rate is 70%.

Xi’an CHIWATEC Water Treatment Technology is a high-tech enterprise specialized in various water processing devices. Aside from these individual products, which cover a number of types and series, we can also help with related comprehensive engineering projects. Thanks to our hard work and dedication upon our founding, we are now one of the fastest-developing water treatment equipment manufacturers in Western China.

Further reading:

Desalt Water Pure Filter

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