Raw water → raw water tank pump → → original multi-media filter (quartz sand filter) → activated carbon filter → soft processor (adding scale inhibitor device) → precision filter → high-pressure pump → a reverse osmosis (RO) unit → Pure water tank → ultraviolet disinfection unit (ozone sterilization device) → water points 1, the original water tank 1) The role: to overcome the instability of the water supply pipe network to ensure continuous and stable supply of the entire system; but also to the reliable long-term performance of each device to provide a guarantee . 2) Selection: PE material or stainless steel tanks. 3) Control: configure the high-water tank float valve and low water level switch. It has a high reliability, low cost, simple structure, easy installation, and other advantages. When the water level is high, the float valve is closed, stop the water. When the water level is low water, high water float valve to open, began to tank water. Meanwhile, the low water level switch disconnected, booster pump stopped working. 2, the original water pump 1) The role: to provide the necessary equipment, pretreatment of work pressure. 2) Selection: According to the pre-design pressure drop (the largest drop for each filter device 0.05Mpa), and former high-pressure pump pressure can not be less than 0.5Kg / cm2, determine the work pressure booster pump. 3) Control: after the pump to adjust the pressure regulator valve and the amount of water used. 3, mechanical filters (quartz sand filter) 1) The role: raw water first passes through a mechanical filter, the purpose of fine quartz sand placed 12-24 in the filter, so that floc raw water, rust and other impurities suspended in this process trapped. Due to mechanical filter large amounts of suspended impurities trapped at work, in order to ensure the normal operation of the filter, the filter must be washed regularly, backwashing. 2) Selection: Selection of FRP (fiberglass material) container 3) Control: mechanical filter backwash operation using manual control, the filter should be cleaned once a day, cleaning time is 10-20 minutes. 4, activated carbon filter 1) Role: This process uses activated carbon filters, reverse osmosis unit to deal with as it is very important. Reverse osmosis systems require water indicators SDI≤5, chlorine <0.1mg / L. In order to meet its water requirements, the need for further purification of the raw water, so as to achieve the reverse osmosis water indicators. Setting a carbon filter in front of the reverse osmosis unit, has two main functions: A, part of the organic matter adsorption, absorption rate of about 60% B, adsorption of chlorine. Adsorbed particle size of about 10-20 angstroms inorganic colloids, organic colloidal and dissolved organic polymer impurities in the sand filter and is difficult to remove the chlorine. Activated carbon is able to adsorb the particle size in the tens angstroms actives, due to its structure in the presence of a large number of average pore diameter of 20-50 ? pores and grain gaps, the structural characteristics of the activated carbon, so that its surface adsorption area can be reached 500-2000m2 / g, due to molecular diameter is generally slightly smaller than 20-50 ? organic, organic matter and therefore the activated carbon has a strong adsorption. Besides activated carbon has a strong ability dechlorination, as a strong oxidizing chlorine, chlorine and carbon react to produce carbon dioxide and chloride ions, and therefore only the loss of a small amount of carbon, activated carbon dechlorination can be used quite so long time. Activated carbon not only has more features, but also to remove the water odor, color, improve water clarity, activated after a period of use, the adsorption capacity decreased, the need for regeneration or replacement. So, after the raw water through a carbon filter, can greatly improve water quality, reduce pollution of the reverse osmosis membrane treated water through reverse osmosis unit to achieve water quality requirements (chlorine <0.1mg / L). 2) Selection: Selection of glass fiber reinforced plastic material container, expansion rate of 40%. 3) Control: activated carbon filters by hand controller, due to a large number of activated carbon adsorption filter suspended impurities in the work, to ensure the system work every day to wash, backwash, rinse process by cleaning time 15-30 minutes. 5, automatic water softening or dosing device 1) action: remove the water hardness (Ca2 +, Mg2 +) is called to soften. This equipment loading Na 001 × 7 strong acidic ion exchange resin, sodium ion replacement raw water calcium and magnesium ions, so that the residual raw water hardness of less than 0.03mmol / L. The purpose is to prevent softening of the surface of the reverse osmosis membrane fouling to extend the life and efficiency of reverse osmosis membranes. 2) Selection: softener material for the glass container 3) Control: The control system uses the American Automatic Control Valve. According to the set time / flow control valve head can be automatically recycled resin, complete absorption of salt backwash, water injection process is red. Equipped with a water softener regeneration box should be checked daily salt and salt water tank and replenish the salt (prohibiting the use of iodized salt and other additives). 6, precision 1) Role: Precision filter, also known as the security filter. It is a treatment process of the raw water before entering the reverse osmosis membrane apparatus. PP filter cartridge has a filter traffic, pollutant carrying capacity, pressure loss characteristics of small impurities can intercept particles of different size, set the surface filtration and depth filtration in one. Precision filter clogging there after a certain period, so that after a certain period PP meltblown filter must be replaced, the replacement based on: sophisticated filtering pressure difference before and after the replacement when 0.05-0.1Mpa. (General security filter pressure gauge value exceeds 0.3M Pa to be replaced!) 2) Selection: Selection of stainless steel container 7, high-pressure pump 1) The role: high-pressure pump is supplied to the reverse osmosis system for the production water flow and water quality pressures. After the filter water pump to a pressure of 10 kg or so, in order to meet the water pressure membrane to ensure pure water out of water. 2) Selection: According to the desired working pressure reverse osmosis membrane, using Grundfos vertical multistage high-pressure pump. 3) Control: When the raw water pressure gauge pointer reaches 2KG, press the switch water production, high-pressure pump starts, the water production. Before the high-pressure pump with pressure protection switch, when the water pressure is less than 1KG, pressure protection switch off, high-pressure pump to stop working. 8, the reverse osmosis unit (pure water device) 1) action: reverse osmosis water purification unit is a major part of the production line. The device used in Japan Nitto Denko America Hyde company's energy-saving composite membrane type reverse osmosis membrane elements ESPA. ESPA series high desalination of brackish water desalination membrane. Can operate at a lower pressure, to obtain high water flux, the average rejection rate of 99.5%. Because ESPA film has the above advantages, providing a wider range of spatial selection of pumps, pressure vessels, piping, valves and other equipment for. And the use of a smaller motor power to meet the needs of their work. At the same time, the characteristics of high water flux membranes ESPA, high rejection rate, which makes equipment manufacturing costs and system equipment investment cost is greatly reduced, and can save a lot of energy and reduce the operational cost of the system and improve water quality. 2) Selection: US Hyde ESPAI-4040/8040. Reverse osmosis water production design temperature 25 ℃, water utilization is 70%. 9. tank (original tank) Role: RO product water reserves and provide a stable water supply system for the next level of work. Control: The tank features a high and low level switches, control high pressure pump and booster pump. When the balance of the tank at a low level, the booster pump starts automatically begin producing water. When the tank is at a high level, high-pressure pump to stop working. 10, booster pump 1) The role: to provide the necessary grade mixed bed after working pressure. 2) Control: after the pump to adjust the pressure and the amount of water (hand operated) with a control valve. 11, purified water tank (finished tank) 1) The role: mixed-bed water into purified water tank, and then sent through the water points purification tank. 2) Control: purified water tank equipped with high and low level switches, control mixed bed of feed water pump. When purified water tank at a low level, the pump began to work, to the purified water tank; high water, mixed bed to the pump to stop working. 12, fine filter processor 1) the role: use 1μm polypropylene filter, which can effectively kill the trapped microscopic particles and bacteria inside the pipe body. Its long life, high traffic, high filtering accuracy, and ensure the supply of sterile production line. After a certain period of use of fine filter processor, water production decreased due to fouling must replace the filter, replace by: pressure difference before and after replacing the filter when 0.05-0.1Mpa. 13, test instrumentation 1) reverse osmosis membranes before the host has a pressure gauge and a pressure gauge after the film, the work pressure membranes were detected and the system has a path running show, freshwater flow meter and water meter to detect the concentration of concentrated, freshwater traffic. 2) reverse osmosis host also has a conductivity meter, resistivity meter. Online testing freshwater water quality, intuitive and convenient, they can always observing changes in water quality product water. 3) pretreatment has a pressure gauge, always observe the equipment operating conditions, and can analyze device operation.