Generally, the pure water equipment system is usually composed of the following modules: raw water pump, raw water tank, quartz sand filter, activated carbon filter, safety filter, softener, EDI, reverse osmosis, polishing mixed bed, etc. In order to give everyone a comprehensive understanding of the pure water equipment system, Pure Water No.1 introduces the most commonly used pure water treatment equipment modules in the industry with its own 15-year production experience, hoping to help everyone.
quartz sand filter
Quartz sand filter, with its scientific name Shallow medium filter, is an efficient filtering device that uses quartz sand as a filtering medium, filters water with high turbidity through granular or non-granular quartz sand with a certain thickness under a certain pressure, and effectively intercepts and removes suspended solids, organic substances, colloidal particles, microorganisms, chlorine, odor and some heavy metal ions in the water, and finally achieves the effects of reducing water turbidity and purifying water quality. The water quality of the effluent filtered by quartz sand can reach SDI less than 5, turbidity less than 3.0NTU, colloidal silicon removal rate of 70%, colloidal iron removal rate of 70% and suspended matter removal rate of over 70%.
activated carbon filter
Activated carbon filter is a kind of commonly used water treatment equipment. As pretreatment of water treatment desalination system, it can absorb residual chlorine which can not be removed in the previous stage filtration, which can effectively guarantee the service life of the latter stage equipment, improve the effluent quality and prevent pollution, especially prevent free residual oxygen poisoning pollution of the latter stage reverse osmosis membrane and ion exchange resin. At the same time, it also adsorbs pollutants such as small molecular organic matter leaked from the previous stage, which has obvious adsorption and removal effects on peculiar smell, colloid, pigment and heavy metal ions in water, and also has the effect of reducing COD. SDI value of RO influent can be further reduced to ensure SDI<5, residual chlorine < 0.1mg/l and TOC < 2.oppm ..
demineralizer
A softener is an ion exchanger, which consists of a container containing resin, resin, a valve or regulator and a control system. Ion exchangers are divided into sodium ion exchangers, anion and cation beds and mixed beds. Generally, the shell of ion exchange column (device) is made of PVC, PVC-FRP, PMMA, PMMA-FRP, JR, and stainless steel. It is mainly used for the pretreatment of boiler, thermal power station, chemical industry, light industry, textile, medicine, biology, electronics, atomic energy and pure water treatment, for the occasions of softening hard water and preparing deionized water required by industrial production, and can also be used for decolorizing and purifying food and drugs, recovering precious metals and chemical raw materials, and treating electroplating wastewater. The hardness of effluent treated by softener is generally less than 0.03 mmol/l. The equipment can realize automation of ion exchange and resin regeneration process by program control device, and the water production rate is 98%.
Security filter
Security filter (also called precision filter) devices are mostly made of stainless steel with filter elements (such as PP cotton) inside, which are mainly used after multi-media pretreatment filtration and before membrane filtration equipment such as reverse osmosis and ultrafiltration. It is used to filter out fine substances (such as tiny quartz sand, activated carbon particles, etc.) after multi-media filtration, so as to ensure the filtration accuracy of water quality and protect the membrane filter elements from being damaged by large particles. The accuracy grades of the filter elements installed in the precision filtration device can be divided into 0.5μs,1μs,5μs,10μs, etc. Different filtration accuracies are selected according to different use occasions to ensure the accuracy of the effluent and the safety of the membrane elements at the later stage.
Ultraviolet sterilizer
The advantages of UV sterilizer are high radiation intensity stability, long sterilization life up to 9000 hours, high transmittance Shi Ying glass tube, light transmittance ≥87%, and moderate unit price compared with similar products. After sterilization life up to 8000 hours, its radiation intensity remains stable at 253.7um, which is stable compared with similar products in China. There are audible and visual alarm reminders when the lamp tube is broken. Design of high brightness mirror sterilization reaction chamber. Compared with foreign similar products, the sterilization intensity has increased by 18%-27%, and the sterilization rate can reach 99.99%.
EDI system
EDI(Electrodeionization), also known as continuous electrodialysis technology, scientifically integrates electrodialysis technology and ion exchange technology, and realizes the directional migration of ions in water under the action of electric field through the selective permeation of cations and anions by cation and anion membranes and the exchange of ions in water by ion exchange resins, thus achieving deep purification and desalination of water. The filling resin is continuously regenerated by hydrogen ions and hydroxide ions generated by water electrolysis, so high-quality ultrapure water can be continuously produced without regeneration of acid and alkali chemicals in EDI water production process. It has the advantages of advanced technology, compact structure and simple operation, and can be widely used in electric power, electronics, medicine, chemical industry, food and laboratory fields, which is a green revolution of water treatment technology. The effluent quality has the best stability. After EDI, the resistivity of effluent water quality can reach 10-16MΩ, and the silicon removal rate is 95%.
Reverse osmosis equipment
Reverse osmosis is considered as a molecular filtration process, which can remove 99% of dissolved minerals, 95-97% of insoluble organic matter and more than 98% of biological and colloidal substances from water. Reverse osmosis is a membrane separation technology driven by pressure with the help of the work force of selectively permeable (semi-permeable) membranes. When the pressure applied in the system is greater than the osmotic pressure of the inlet water solution, water molecules continuously permeate through the membrane, flow into the central pipe through the production water channel, and then the impurities such as ions, organics, bacteria and viruses in the water flowing out at one end are trapped at the inlet side of the membrane, and then flow out at the outlet end of concentrated water, thus achieving the purpose of separation and purification.
SMB polishing mixed bed
In order to obtain theoretical pure water with conductivity of 0.055μS/cm (resistivity of 18.2 MΩ·cm) for electronic, pharmaceutical or other industries, a polishing mixed bed is usually installed after ordinary mixed bed or EDI water purification equipment for final fine treatment. The resin for polishing mixed bed is a mixture of negative resin and positive resin with close relative density. Because the negative resin and positive resin of this resin can not be separated and can not be regenerated separately by acid and alkali, this polishing resin will be discarded after failure.