Double-stage reverse osmosis equipment includes two-stage RO device, cleaning system and intermediate water tank.
RO reverse osmosis mainly removes dissolved salts in water, organic matter, silica colloids, macromolecules and particles not removed by pretreatment. The use of two-stage RO process can effectively remove ions from the water, while making the water to meet the subsequent EDI device process water requirements.
Reverse osmosis system consists of a 5μ filter, two high-pressure pumps and pressure vessels and reverse osmosis membrane. The first stage of reverse osmosis device RO according to 2:1 arrangement, using six 8-inch membrane tandem arrangement, water production is m3 / h, recovery rate of 75%; the second stage of reverse osmosis device RO according to 1:1 arrangement, using three 8-inch membrane tandem arrangement, water production is m3 / h, recovery rate of 85%. The first stage of the membrane element selected Hydronics low-pressure composite membrane CPA3, the second stage selected Hydronics ultra-low-pressure composite membrane ESPA2. (Selection of ESPA3 membrane)
In order to ensure the stable operation of the RO device, set up in front of the RO UV sterilizer and scale inhibitor dosing system. 1 UV sterilizer, the processing capacity of 17.6m3/h, the main role is to kill the bacteria in the water to avoid fouling of the RO membrane blocked. Avoid RO membrane is fouled and blocked. UV lamp emission wavelength of 254 nm, intensity of 30,000 μWs/cm2, sterilization rate of 99%.
In order to prevent the RO device in the thick water side of the scale, must be in the water inlet to add scale inhibitor, scale inhibitor using FLOCON260, the design dosage of 2.4 mg / L. Or PTP0100 scale inhibitor, the design dosage of 1 mg / L. In order to remove CO2 in the water, in the two levels of RO between the addition of NaOH to regulate the pH value of the water of the first RO 7.83, NaOH design dosage of 7.83, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH, NaOH. The designed dosage of NaOH is 4.5 mg/L.
The RO cleaning system is a skid-mounted equipment, including cleaning box, 5 μm filter and cleaning pump. When the RO system scaling or clogging can be RO device cleaning, but also can clean the EDI.
The function of the intermediate tank is to store RO water, adjust the amount of water, so that the system operation can be flexibly adjusted.
Two-stage RO system water conductivity <10 μs/cm, SiO2 content <500 μg/L, TOC <50 μg/L.
Process
Raw water pressurized pump - multi-media filter - activated carbon filter - water softener - security filter - the first water pump - the first water filter - the first water filter - the water softener - security filter Water softener - security filter - the first stage reverse osmosis machine - the second stage reverse osmosis machine - water storage tank - pure water transfer pump - water point
Reverse osmosis device application range
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1. Purification of purified water, distilled water, water for food and configured beverages.
2. Preparation of pure water ultrapure water in electronics, pharmaceutical, food and other industries.
3. Light textile, chemical, food and other industries for separation, concentration, liquid decolorization for the purpose of process engineering.
4. Desalination of seawater and brackish water.
Reverse osmosis characteristics
1. Large water permeability, high rate of desalination. Under normal circumstances ≥ 98%
2. High retention and removal of organic matter, colloids, particles, bacteria, viruses, heat and so on.
3. Small energy consumption, high water utilization, lower operating costs than other desalination equipment.
4. There is no phase change in the separation process and it has reliable stability.
5. The equipment is small in size, simple in operation, easy to maintain, adaptable, and has a long service life.