Food high purity water project

The reverse osmosis equipment passes the raw water through a fine filter, a granular activated carbon filter, a compressed activated carbon filter, and the like , and is pressurized by a pump , and the pore diameter is 1/10000 μm ( corresponding to 1/6000 of the size of Escherichia coli , 1 of the virus) /300) Reverse osmosis membrane (RO membrane ), which makes high-concentration water into low-concentration water , and at the same time isolates a large amount of impurities mixed with water from industrial pollutants, heavy metals, bacteria, viruses, etc., thereby achieving the physical and chemical regulations of drinking. Indicators and health standards , output to pure to pure water , is a good choice for the human body to timely supplement high-quality water . The purity of water produced by RO reverse osmosis technology is currently high in all water-making technologies mastered by humans . The cleanliness is almost 100%, so people call this water production machine a reverse osmosis pure water machine.
Reverse osmosis equipment uses membrane separation technology to effectively remove charged ions, inorganic substances, colloidal particles, bacteria and organic substances in water. It is a good equipment for high-purity water preparation, brackish water desalination and wastewater treatment. Widely used in electronics, medicine, food, textile, chemical, power generation and other fields.

Pretreatment system
 
Generally include raw water pumps, dosing devices, quartz sand filters, activated carbon filters, precision filters, etc. Its main role is to reduce the pollution index of raw water and other impurities such as residual chlorine to meet the requirements of reverse osmosis. The equipment configuration of the pretreatment system should be based on the specific conditions of the raw water.
Reverse osmosis device
It mainly consists of multi-stage high-pressure pump, reverse osmosis membrane element, membrane shell ( pressure vessel ) , and bracket. Its main function is to remove impurities in the water, so that the effluent meets the requirements of use.
Post processing system
It is an increased configuration in the case where reverse osmosis cannot meet the water demand. It mainly includes one or more kinds of equipment such as an anion bed, a sun bed, a mixed bed, sterilization, ultrafiltration, and EDI . The post-treatment system can improve the effluent quality of reverse osmosis to meet the requirements of use.
Cleaning system
It mainly consists of a cleaning water tank, a washing water pump and a precision filter. When the reverse osmosis system is unable to meet the requirements of the contaminated effluent index, it is necessary to clean the reverse osmosis to restore its efficacy.
Electrical control system
It is used to control the normal operation of the entire reverse osmosis system. Including dashboards, control panels, various electrical protection, electrical control cabinets, etc.
Reverse osmosis technology has been increasingly used due to its special advantages. The cleaning problem of reverse osmosis water purification equipment may cause losses to many users with weak technical strength. Therefore, to manage the reverse osmosis equipment, serious problems can be avoided.
1. Low pressure flushing reverse osmosis equipment
Regular high-flow, low-pressure, low- pH flushing of reverse osmosis equipment is beneficial to remove dirt adhering to the surface of the membrane, maintain membrane performance, or when the SDI of the reverse osmosis equipment suddenly rises above 5.5 , Perform low pressure flushing and turn the machine on after the SDI value is adjusted.
2. Reverse osmosis equipment outage protection
Due to fluctuations in production, reverse osmosis equipment is inevitably shut down frequently. Protective measures must be taken when decommissioning in the short or long term. Unsuitable handling will result in a decrease in membrane performance and unrecoverable.
Short-term storage is suitable for systems that have been shut down for less than 15 days , and reverse osmosis equipment can be protected by low-pressure flushing every 1 to 3 days . It has been found that when the water temperature is above 20 °C , the water in the reverse osmosis equipment will be stinky after being stored for 3 days , and a large amount of bacteria will multiply. Therefore, it is recommended that the water temperature should be flushed every 2d or 1d when the water temperature is higher than 20 °C. When the water temperature is lower than 20 °C , it can be washed every 3d at low pressure. After each flushing, all the inlet and outlet valves on the reverse osmosis unit of the water purification equipment should be closed. .
Long-term deactivation protection is applicable to systems that have been out of service for more than 15 days . In this case, the protective liquid ( biocide ) must be filled with the reverse osmosis unit of the water purification equipment for protection. The commonly used biocide formula ( composite film ) is formaldehyde 10 ( mass fraction ) , isothiazolinone 20 mg/L , and sodium hydrogen sulfite 1 ( mass fraction ) .
3. Reverse osmosis membrane chemical cleaning
Under normal operating conditions, reverse osmosis membranes may also be contaminated by inorganic scales, colloids, microorganisms, metal oxides, etc. These substances may deposit on the surface of the membrane, causing a decrease in the output of the reverse osmosis unit of the water purification equipment or a decrease in the salt rejection rate. It raises and even causes irreparable damage to the membrane. Therefore, in order to restore good water permeability and desalination performance, the membrane needs to be chemically cleaned.
Generally , it should be cleaned once every 3 to 12 months. If it has to be cleaned once a month, this indicates that the pretreatment system should be improved and the operating parameters adjusted. If it needs to be cleaned once in 1 to 3 months, it is necessary to improve the operation level of the equipment. It is difficult to judge whether it is necessary to improve the pretreatment system.
1. Raw water tank ( optional ) reverse osmosis equipment process map ( click to enlarge )
Store raw water for sedimentation of large sediment particles and other precipitable substances in water. At the same time, it buffers the impact of water pressure instability on the water treatment system in the raw water pipe. ( If the water pressure is too low or too high, the pressure sensing reaction ) .
2. Original water pump
Constant system water supply pressure, stable water supply.
3. Multi-media filter
The filter with multiple filtration layers is mainly used to remove the sediment, rust, colloidal substances, suspended solids and other particles containing more than 20um in the raw water . It can be backwashed by manual valve control or fully automatic controller. Flush and other operations. Ensure the water quality of the equipment and extend the service life of the equipment.
4. Activated carbon filter
The system uses a shell-shell activated carbon filter. The activated carbon not only adsorbs electrolyte ions, but also performs ion exchange adsorption. By activated carbon adsorption can also make oxygen consumption of potassium permanganate (COD) 15mg / L (O2 ) decreased from 2 ~ 7mg / L (O2) , in addition, since the increase in the surface adsorption of the adsorbed copied concentration, thus further It acts as a catalyst, removes pigments, odors, large amounts of biochemical organic matter, reduces residual chlorine values ​​of pesticides, and removes trihalides (THM) and other pollutants from water. Manual valve control or fully automatic controller can be used for backwashing, flushing and other operations. Ensure the water quality of the equipment and extend the service life of the equipment. At the same time, the equipment has a self-maintenance system and the operating costs are low.
5. Ion softening system / dosing system
In order to dissolve the concentrated discharge of solid matter and the utilization of fresh water, the R/O device prevents CaCO3, MgCO3, MgSO4, CaSO4, BaSO4, SrSO4, SiSO4 from occurring on the concentrated water side of a membrane module after the concentrated water end, especially the RO unit . concentration greater than its equilibrium solubility product constant and crystallization, damage the original properties of the film should, before entering the reverse osmosis membrane, an ion softening device or should be used to serve the appropriate amount of carbonate scale inhibitor to prevent, SiO2, sulfate crystals Precipitate .
6. Precision filter
The use of precision filters to remove suspended solids, non-straight particles and colloids in the influent water makes the subsequent operation of the RO system safer and more reliable. The filter element is a 5um meltblown filter element, the purpose of which is to remove impurities larger than 5um which are leaked from the upper filter unit . Preventing it from entering the reverse osmosis device damages the surface of the membrane, thereby damaging the desalination performance of the membrane.
7. Reverse osmosis system
The reverse osmosis device separates the solvent ( usually water ) in the solution through a reverse osmosis membrane ( or semi-permeable membrane ) with sufficient pressure because this process is opposite to the direction of natural permeation and is therefore called reverse osmosis.   The reverse osmosis method can adapt to all kinds of raw water with salt content, especially in the high-salt water treatment project, which can obtain good technical and economic benefits. The reverse osmosis method has high salt rejection rate, high recovery rate, stable operation, small floor space and simple operation. The reverse osmosis equipment removes most bacteria, colloids and large molecular weight organic substances while removing salt.
8. Ozone sterilizer / UV sterilizer ( optional )
Kill the bacteria caused by secondary pollution to completely ensure the hygiene index of the finished water .
The reverse osmosis membrane separation technology is separated by the reverse osmosis membrane principle and has the following remarkable features:
· Separation of solute and water under the condition that no phase change occurs at normal temperature, suitable for separation and concentration of heat sensitive substances, and lower energy consumption than separation method with phase change.
· Reverse osmosis membrane separation technology has a wide range of impurity removal.
·High salt rejection and water reuse rate, which can cut off solute with a particle size of several nanometers or more.
· Using low pressure as the membrane separation power, the separation device is simple, the operation, maintenance and self-control are simple, and the site is safe and sanitary.
Application areas:
Reverse osmosis membrane technology in pure water treatment of power plant boilers, water supply, electronics, semiconductor industry, pure water treatment, chemical and pharmaceutical industries, food, beverage, drinking water treatment, seawater, brackish water desalination, metallurgy, light industry, electroplating and leather It has been widely used in industries such as wastewater treatment.

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