Detailed explanation of various problems of reverse osmosis system
RO reverse osmosis desalting water purification equipment
Reverse osmosis water treatment equipment as a special equipment for purifying water filtration production, using the selective transmission principle of reverse osmosis membrane, through the high pressure pump of the equipment to apply a certain pressure to the raw water through the reverse osmosis membrane, so that the water molecules in the raw water can be permeated through the membrane and out. However, other inorganic salts, microorganisms and organic matter can not penetrate the reverse osmosis membrane due to the interception characteristics of these substances, so as to obtain pure non-ionized water.
Reverse osmosis (RO) is an important component of membrane separation technology. At higher osmotic pressure than the solution, other substances and water are removed from the semi-permeable membrane depending on their impenetrability.
Because the membrane aperture of reverse osmosis membrane is very small (only about 10A), it can effectively remove dissolved salts, colloid, microorganisms, organic matter, etc. (removal rate is as high as 97-98%).
It has the advantages of good water quality, low energy consumption, no pollution, simple process and easy operation. It is the most energy saving and simple technology for desalination of seawater and brackish water and preparation of pure water.
At present, it has been widely used in medicine, electronics, chemical, food, seawater desalination and many other industries.
The RO system shall adopt automatic control operation mode according to the water level of the primary desalting tank and the system water production. If it is necessary to start, stop or switch the system, the operator shall confirm and manually switch the system. The control of RO system and the control of the entire chemical water treatment equipment are realized through the control system (PLC) in the control room. We select imported membrane components with large water permeability, high desalting rate, good chemical stability, good anti-pollution performance and good mechanical strength according to the raw water quality. We propose the maximum membrane flux, recovery rate and maximum water supply membrane area of membrane components according to the water quality and SDI value of the source water. The arrangement and combination of stages and segments of membrane modules are determined by influent water quality, recovery rate and water yield.
RO is the most advanced and practical desalination equipment at home and abroad. This system uses reverse osmosis membrane of Dow Company. It can remove organic matter, bacteria and viruses, the membrane can be operated in ultra-low pressure working environment, so as to achieve energy saving, reduce equipment investment and operating costs. And to achieve the best combination of water permeability and desalinization, so Dow membrane has been widely used in the world, its technical performance and product quality has been praised by users.
① Electrical line failure, such as bad insurance, wire fall off
② The thermal protection element is not reset after protection
③ Water underpressure, check insurance, check everywhere wiring
④ The thermal protection element is reset
⑤ Check the waterway and ensure the water supply pressure
After the device is started, the water inlet solenoid valve is not opened
① Cable shedding
② Solenoid valve internal mechanical failure
③ Solenoid valve coil is broken
① Check the line
② Remove the solenoid valve for repair
③ Repair or replace the coil
Pump running, but not up to rated pressure and flow
① pump reversal
② The filter element of the security filter is dirty
③ There is air in the pump
④ Flush the solenoid valve to open
① Reconnect cables
② Clean or replace the filter element
③ Remove the air in the pump
④ Adjust the pressure after washing
The pump is noisy when the system pressure rises
① The flow of raw water is not enough
② Raw water flow is unstable
③ Check the original water pump and pipes
④ Check the original water pump and pipeline, and check whether the pipeline leaks
The solenoid valve is not closed after washing
① Solenoid valve control element and line fault
② Mechanical failure of solenoid valve
③ Check or replace components and circuits
④ Remove the solenoid valve and repair or replace it
Undervoltage stop
① The supply of raw water is insufficient
② The security filter element is blocked
③ Improper pressure adjustment
Automatic flushing causes underpressure
① Check whether the raw water pump and pretreatment system are working
② Clean and replace the filter element
③ Adjust the system pressure to the best state, so that the pressure after filtration is maintained at more than 20psi
The concentration water pressure is not up to rating
① pipeline leakage
②The flushing solenoid valve is not completely closed
③ The recovery system leaks
① Check and repair pipelines
② Check and replace the flushing solenoid valve
③ Check and repair the recovery system
The pressure is adequate, but the pressure display is not adequate
① The pressure gauge hose is blocked with foreign matter
② There is air in the hose
③ Pressure gauge fault
① Check and dredge the pipeline
② Remove air
③ Replace the pressure gauge
Deterioration of water quality
① Membrane pollution and scaling
② film junction seal aging failure
① Chemical cleaning is carried out according to technical requirements
② Replace the O-ring
③ Replace the film
Production decline
① Membrane pollution and scaling should be cleaned chemically according to technical requirements
② Water temperature change is determined by recalculating the actual water temperature
RO reverse osmosis purified water purification equipment process description
RO reverse osmosis purified water purification equipment combined with the advantages of drinking water purification process in a body, cabinet design, maintenance is very convenient, at the same time using reverse osmosis program controller for control, to ensure that the equipment running freely, simple operation, control operation only need a switch, greatly improve the stability of the operation of the equipment, So RO reverse osmosis purified water equipment operation process is what, this article will be detailed description.
1. Pretreatment:
Preliminary treatment of raw water, improve water quality, make it meet the requirements, reduce, delay membrane pollution, prolong its life, the object of its treatment is mainly in the water microorganism, bacteria, colloid, organic matter, heavy metal ions, solid particles and free chlorine. To meet the requirements of water intake of reverse osmosis device, ensure the long-term stable operation of reverse osmosis device. It consists of sand filter, carbon filter, water softener and security filter.
Quartz sand filter: filter out sediment, impurities, suspended matter in the water, reduce the SDI(pollution index density) value of raw water.
Activated carbon filter: has a dual role, one is adsorption, the other is filtration. Filter out chemical organic matter, heavy metal, chroma, odor, residual chlorine in tap water, improve taste.
Resin water softener: Through sodium cation exchange resin exchange treatment, remove calcium, magnesium and other scaling ions of raw water, remove the hardness of raw water.
Precision (security) filter: 5 micron PPF filter element, intercept objects larger than 5 micron, prolong the life of the film.
2. Reverse osmosis device:
Reverse osmosis device can remove organic matter in water (such as trihalomethane intermediates, colloid, suspended matter, microorganisms, bacteria, algae, mildew, etc.), heat source, virus and other substances, fluid after the first three pretreatment of water by reverse osmosis RO membrane host deep separation treatment, so that beneficial to human health through the water, not conducive to human health water exclusion, desalination rate 98%, The purified water produced goes into the pure tank, and depending on the specific situation, membrane filtration is divided into primary or secondary reverse osmosis treatment
A good system design can ensure that the whole system in 3 years without replacing the membrane element (service life and water quality related), online conductivity display instrument, dynamic display of water quality at any time. The high pressure pump provides the working pressure of the membrane through the water. Maintain water yield. This water treatment system is one stage reverse osmosis.
3. Control system:
The system changes the corresponding output signals of water inlet valve, high pressure pump, flushing valve and other executive components according to the changes of high pressure, low pressure, liquid level, reset, switch and other input signals to achieve automatic control of a standard RO system, pressure protection, liquid level control, startup/full water/automatic flushing and other functions.
