Before discussing the effectiveness of reverse osmosis scale inhibitors in water purification equipment, let's first outline the reverse osmosis system software: Reverse osmosis water purification equipment is a device that passes the source water through reverse osmosis equipment, particle activated carbon filtration device, and reduced activated carbon filtration device, and then uses a diameter of 1/10000 according to pump charging pressure μ The reverse osmosis membrane (RO membrane), which is equivalent to 1/6000 of the size of Escherichia coli and 1/300 of the virus infection, converts water with higher concentration into water with lower concentration. At the same time, it protects industrial pollutants, heavy metals exceeding standards, bacteria, virus infections, and other residues that seep into the water. The water purification equipment then achieves the required chemical composition and quality standards for consumption, and produces water with a clear to mellow yield rate. It is a good choice for the body to immediately fill in high-quality water. Because the purity of water produced by RO reverse osmosis technology is one of the most important water treatment technologies that people grasp at present, the cleanliness level is basically 100%.

Permeation membrane is the main equipment of reverse osmosis system software. When the system software continues to operate for a long time, calcium and magnesium low-temperature plasma in the water will continue to precipitate and adhere to the surface of the reverse osmosis membrane, causing scaling and blocking of membrane pores. This can harm the high efficiency of the reverse osmosis system software's effluent and damage the reverse osmosis membrane. Due to the high cost of reverse osmosis membranes, it is necessary to upgrade the dosing device during system software operation. The water purification equipment adds reverse osmosis scale inhibitors to the water to slow down the precipitation of chlorite and membrane fouling.

scale inhibitor

Reverse osmosis scale inhibitor is a professional scale inhibitor used in reverse osmosis (RO) system software, nanofiltration (NF), and ultrafiltration (UF) system software. It can avoid membrane fouling, improve water production rate and quality, and reduce operating costs.

1. Characteristics

① Reasonable manipulation of inorganic compound scaling within a very large concentration range

② Not condensing with iron aluminum metal oxides and silicon chemicals to produce insoluble substances

③ It can effectively suppress the aggregation and accumulation of silicon, and the concentration of SiO2 on the concentrated water side can reach 290ppm

④ Can be used for reverse osmosis CA and TFC membranes, nanofiltration membranes, and Dow reverse osmosis membranes

⑤ Excellent solubility and reliability

⑥ The pH value of water supply and drainage is reasonable within the range of 5-10

2. The basic efficacy of reverse osmosis scale inhibitors

① Coordination and solubilization effect: When reverse osmosis scale inhibitors dissolve water, they produce hydrolysis, which is transformed into negatively charged molecular structural chains. They form water-soluble complex ions or chelates with Ca2, thereby improving the solubility of carbonates and having anti scaling effects.

② Lattice constant fluctuation effect: A portion of functional groups in the molecular structure of reverse osmosis scale inhibitors isomerize on carbonate energy sources or nano microcrystals, occupying a certain position, blocking and destroying all normal growth and development of carbonate crystals, slowing down the growth rate of crystals, and thereby reducing the production of salt scale;

③ Effect of electrostatic induction repulsion force: When reverse osmosis scale inhibitors dissolve water, they adsorb onto the nanocrystals of carbonates, increasing the repulsion force between particles, blocking their coalescers and placing them in a good dispersion state, thereby avoiding or reducing the generation of scale.

④ The types and applications of reverse osmosis scale inhibitors are used to improve the software characteristics of reverse osmosis and nanofiltration membrane systems

⑤ Scale inhibitors and dispersants are a series of organic chemical drugs used to prevent the deposition and scaling of crystalline mineral salts.

3. The role of scale inhibitors

a. The inhibitory effect on precipitation is easy to construct in system software with scale inhibitors. The ion product value when the ions and cations of the components gradually precipitate is much larger than the critical value when there is no scale inhibitor.

b. The dispersion effect is more difficult to settle due to the small particle size of the precipitated particles in the presence of scale inhibitors than in the absence of scale inhibitors.

c. The effect of lattice constant deformation on the precipitation of crystals in system software with scale inhibitors includes spherical, polyhedral, and small snowflake shaped amorphous crystals. It is generally believed that amorphous crystals are crystals that, during the entire process of crystal growth and development, scale inhibitors adsorb on the surface of the crystal bud, causing a sudden decrease in the growth and development rate of the surface layer, resulting in crystals that are different from their original appearance.

d. The lower limit of the effectiveness of the scale inhibitor is equivalent to the much lower amount of sediment in the water, which can also indicate the actual effectiveness of scale inhibition.

4. Application of RO scale inhibitor

a. When selecting polyacrylic acid scale inhibitors, special attention should be paid to the possibility of causing membrane environmental pollution when the iron content is high. This type of environmental pollution can increase the actual operating pressure of the membrane. Reasonable elimination of such environmental pollution requires acid washing and passivation.

b. If positive ion coagulants or filter aids are used in the preparation process, attention should be paid when using cationic scale inhibitors. It will cause a thick and viscous pollutant, and environmental pollution will lead to an increase in actual operational pressure, making it very difficult to clean up such pollutants.

c. The scale inhibitor inhibits the growth and development of salt crystals in RO infiltration and concentrated water, thus allowing insoluble salts to exceed their saturation solubility in concentrated water. The application of scale inhibitors can replace electrolytic copper sulfate and can also be combined with the application of electrolytic copper sulfate. There are many factors that can harm the formation of mineral scaling. A decrease in temperature will decrease the solubility of scaling minerals, except for calcium bicarbonate and most chemical substances. Conversely, its solubility decreases with increasing temperature. The increase in TDS will increase the solubility of insoluble salts, which is due to the high ionization degree affecting the generation of crystal seeds.

d. The idealized addition of large amounts of scaling chemicals and pollutants with good contrast is determined by the specialized program package provided by the drug dealer. Excessive addition of scale inhibitors/dispersants can cause accumulation on the membrane surface, leading to new environmental pollution problems. When the machine equipment is shut down, it is necessary to completely clean the scale inhibitor and dispersant, otherwise it will remain on the membrane and cause environmental pollution problems. When using RO infiltration for low-voltage cleaning, it is necessary to stop introducing scale inhibitors and dispersants into the system software.

e. The design scheme for introducing scale inhibitors/dispersants into the system software should ensure that the static data stirring device is a very reasonable mixing method for the reverse osmosis components to be fully mixed before. The introduction of most system software is based on the buffer time in the filtration device and the mixing efficiency of the RO inlet centrifugal water pump before the RO infiltration multimedia filter. If the system software uses electrolytic copper sulfate to adjust pH, it is strongly recommended that the electrolytic copper sulfate point be thoroughly mixed and evenly distributed in a sufficiently distant area upstream and downstream before reaching the point of introduction of scale inhibitors/dispersants.

f. The dosing metering pump for introducing scale inhibitors/dispersants should be adjusted to a higher injection rate. The proposed injection rate is at least once every 5 seconds. The typical addition amount of scale inhibitor/dispersant is 2-5ppm. In order to make the dosing metering pump work at a higher frequency, it is necessary to carry out dilution of drugs. Scale inhibitor/dispersant products come in both extraction solution and solid powder form. The level of biological invasion and environmental pollution caused by diluted scale inhibitors/dispersants in storage tanks depends on the indoor temperature and dilution ratio of the diluent. We strongly recommend a shelf life of 7-10 days for the sealing solution. Under normal circumstances, scale inhibitors/dispersants without dilution are less susceptible to biological invasion. Another key challenge in selecting scale inhibitors/dispersants is to ensure thorough compatibility with reverse osmosis membranes. Compatibility issues with drugs can lead to irreversible membrane damage.

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