The utilization of reverse osmosis concentrated water is a popular method nowadays. It can improve the water utilization rate of reverse osmosis and achieve the purpose of energy saving and emission reduction. However, the reverse osmosis concentrated water has been concentrated several times of the inorganic salts in the original water. Its utilization requires more scientific calculations. Generally, the reverse osmosis water is mostly used for car washing and landscape water. If it is reused in industry, it usually needs to be treated by membrane method again. , the specific steps are as follows:
1. Scientifically analyze the water quality of reverse osmosis concentrated water;
2. Use design software to select appropriate membrane components based on the concentrated water quality report;:< /p>
3. The key is to reuse the reverse osmosis concentrated water for scale inhibition and dosing, which should be reasonably selected based on the water quality report;
4. Scientifically design the host and match the original equipment.
As an efficient and clean desalination technology, the reverse osmosis concentrated water reuse equipment process is widely used in various industries. However, during the production process, concentrated water accounts for about 25% of the total incoming water. Discharge, which has caused a great waste of water resources in today's increasingly scarce water resources, and has also seriously hindered the further promotion of reverse osmosis technology.
The characteristics of concentrated water discharged from reverse osmosis concentrated water reuse equipment are:
◆High salt and silica content, high pH, ??and high alkalinity;
< p>◆The ion product of scaling salts is much larger than their solubility product, such as: CaCO3, CaSO4, BaSO4, SrSO4;◆Bacteria and organic matter exist.
Reverse osmosis concentrated water reuse equipment is prone to problems:
Easy to scale: Because it is concentrated water that has been concentrated four times, the silica content and alkali content in this water The degree of corrosion is large, and the ion products of many scaling salts such as CaCO3, CaSO4, BaSO4, SrSO4, etc. are much greater than their concentration products. If effective methods are not used to control them, scaling is inevitable.
Easy to fouling and clogging: In the reverse osmosis concentrated water, trace amounts of organic matter and colloids in the incoming water are enriched. If there is no effective control, it will also cause fouling of the reverse osmosis membrane.
Easy to contaminate: In reverse osmosis concentrated water, microorganisms in the incoming water accelerate their growth under the action of various enriched nutrient salts, which will cause biological pollution of the reverse osmosis membrane, so it is also necessary to be effectively controlled.