Ⅰ.reverse osmosis pure water equipment introduction 

reverse osmosis equipment application of membrane separation technology, can effectively remove charged ions in water, inorganic substances, colloidal particles, bacteria and organic substances, etc., is the preparation of high purity water, brackish water desalination and wastewater treatment process in the best equipment.

1, equipment system composition 

reverse osmosis water treatment system generally includes pretreatment system, reverse osmosis device, post-treatment system, cleaning system and electrical control system. 　

Pre-treatment system generally includes raw water pump, dosing device, quartz sand filter, activated carbon filter, precision filter and so on. Its main role is to reduce the pollution index of the raw water and other impurities such as residual chlorine, to achieve the feed water requirements of reverse osmosis. 　

Reverse osmosis device mainly includes multi-stage high-pressure pump, reverse osmosis membrane element, membrane shell (pressure vessel), bracket and other components. Its main role is to remove impurities in the water, so that the effluent water to meet the requirements of use.

Post-treatment system is in the reverse osmosis can not meet the water requirements of the case of increased configuration. Mainly includes negative bed, positive bed, mixed bed, sterilization, ultrafiltration and so on one or more kinds of equipment.

Cleaning system mainly has cleaning water tank, cleaning pump, precision filter composition. When the reverse osmosis system is contaminated water indicators can not meet the requirements, the need for reverse osmosis cleaning to restore its effectiveness.

Electrical control system is used to control the normal operation of the entire reverse osmosis system. Including instrument panel, control panel, all kinds of electrical protection, electrical control cabinet and so on.

2, design features 

(1) by increasing the pressure on the water to achieve deep filtration of water. Reverse osmosis water purification equipment includes general filters in addition to fine filters, granular activated carbon filters and compressed activated carbon filters. Fine filters have finer filtration functions than general filters and can better filter impurities in water. As we know, activated carbon has a good adsorption and filtration function for odor and impurity, and the reverse osmosis pure water equipment uses double activated carbon filter to realize the deep filtration processing of raw water and improve the filtration efficiency of the equipment. At the same time, it is also an innovation to enhance the filtration capacity by increasing the pressure of water.

(2) The core of reverse osmosis water purification equipment is the application of reverse osmosis membrane. Reverse osmosis membrane is a kind of filtration membrane with extremely small pore size, and the use of this membrane can realize ultra-fine filtration of raw water, and at the same time, the water can be divided into higher concentration and lower concentration. Higher concentration of water can be recycled and reuse, low concentration of water is pure water, can be used for human consumption.

3, the main process 

(1) raw water tank 

storage of raw water, used to precipitate large sand particles in the water and other precipitable substances. At the same time, buffer the impact of unstable water pressure in the raw water pipe on the water treatment system. (Such as water pressure is too low or too high caused by the pressure sensing response).

(2) raw water pump 

constant system water supply pressure, stabilize the water supply.

(3) Multi-media filter 

Filter with multiple filtration layers, the main purpose of which is to remove sediment, rust, colloidal substances, suspended solids and other particles contained in the raw water above 20 μm, can be selected from the manual valve control or full-automatic controller for a series of operations, such as backwashing, positive flushing. Ensure the quality of water produced by the equipment and extend the service life of the equipment.

(4) Activated carbon filter 

system uses shell activated carbon filter, activated carbon can not only adsorb electrolyte ions, but also ion exchange adsorption. The activated carbon adsorption can also make the potassium permanganate oxygen consumption (COD) from 15mg/L (O2) down to 2-7mg/L (O2), in addition, due to the adsorption effect so that the surface is adsorbed by the increase in the concentration of replicates, and thus also play a catalytic role, remove the pigment in the water, odor, a large number of biochemical organic matter, reduce the residual chlorine value of water and pesticide pollutants and remove the water of the trihalogenated compounds (THM), as well as other pollutants. pollutants in the water. At the same time, the equipment has a self-maintenance system, low operating costs.

(5) Ion softening system 

R/O device for the concentration of dissolved solids discharge and the use of fresh water, in order to prevent the concentration of concentrated water end, especially the last membrane module RO device concentration side of the water is greater than its equilibrium solubility constant and crystallization precipitation, damage to the membrane original due to the characteristics of the membrane module, in the reverse osmosis membrane module should be used before the use of ion-softening devices or put an appropriate amount of scale inhibitor to prevent the precipitation of carbonate, SiO2, sulfate crystals. SiO2, sulfate crystals precipitation.

(6) Precision Filter 

A precision filter is used to remove suspended solids, non-curved particles and colloids remaining in the feed water to make the RO system and other subsequent equipment run more safely and reliably. The filter element is a 5μm meltblown filter element, the purpose of which is to prevent the superior filtration unit from removing impurities larger than 5μm. Prevent entry into the reverse osmosis unit damage to the surface of the membrane, thereby damaging the membrane desalination performance.

(7) Reverse osmosis system 

Reverse osmosis device is to use enough pressure to make the solvent in the solution (generally water) through the reverse osmosis membrane (or semi-permeable membrane) and separate out, because this process and natural osmosis in the opposite direction, so it is called reverse osmosis.

Reverse osmosis method can be adapted to all kinds of salt content of raw water, especially in the high salt content of water treatment works, can obtain very good technical and economic benefits. The desalination rate of the reverse osmosis method is improved, the recovery rate is high, the operation is stable, the floor space is small, the operation is simple, the reverse osmosis equipment removes the salt at the same time, also removes most of the bacteria, colloid and large molecular weight organic matter.

Ⅱ. reverse osmosis water purification equipment maintenance tips 

1, strict control of water quality, to ensure that the device is in line with the water quality requirements of the feed water indicators under the water quality conditions. Inlet water quality does not meet the requirements, it is very easy to cause reverse osmosis membrane fouling blockage, so that the consumables will soon fail, seriously affect the water quality.

2, reverse osmosis total water inlet by RO inlet adjustment valve to control, if the reverse osmosis water inlet does not change, do not adjust the RO inlet adjustment valve, is strictly prohibited to fully open or fully closed. RO drainage adjustment valve is used to adjust the recovery rate of the system, such as no change in the recovery rate, do not mess with the thick row of adjustment valves, absolutely. Prohibit fully open or fully closed.

3, the device can not be a long time out of operation, at least 2 hours a day, such as the preparation of the shutdown for more than 72 hours, the application of chemical cleaning device to the components filled with 1% hydrogen sulfate and 18% glycerol implementation of the protection.

4, reverse osmosis device every time after the start of the shutdown should let the device in the water pressure of 0.4Mpa under the condition of flushing for 10 minutes.

5, operating pressure control, should meet the water production and water quality under the premise of taking the lowest possible pressure value, which is conducive to reducing the membrane of the water flux attenuation, reduce the replacement rate of the membrane.

6, the operator should be in every hour on the operating parameters to record, test the use of pure water equipment and water quality.

The main records are as follows: 

(1) water: PH value, conductivity, pressure, SDI, water temperature.

(2) Produced water: conductivity, flow rate, PH value; 

(3) Concentrated water: flow rate, pressure, and water pressure of each section.

7, when the reverse osmosis device occurs high and low pressure alarm, first check whether the manual valve opening between the security filter and the high pressure pump is too small, and then check whether the RO water inlet regulating valve and the thick discharge valve are normal, and then press the high and low pressure alarm reset button to restart the pure water production equipment.

8, feed water temperature control, should be based on the actual water consumption, take the critical pressure (feed water pressure below the value of the desalination rate to produce a significant drop in the pressure value) can not meet the requirements of the water and water quality of the lowest temperature as the temperature of the feed water within the period of time, so that you can reduce the attenuation of the membrane water.