With the continuous improvement of people's requirements for water quality, pure water preparation technology is widely used in industry, diagnosis and treatment, food and other industries. As one of the important equipment for pure water production, the safety evaluation of multi-media filter is very important to ensure the safety and reliability of water body. In this paper, the safety evaluation of the multi-media filter made from pure water in the system will be evaluated.
1. The working principle and structure of multi-media filter
Multi-media filter is a kind of equipment that uses a variety of substances (such as quartz sand, activated carbon, resin, etc.) to remove suspended solids, organic matter, heavy metals and other impurities in water. The working principle is to trap impurities in the water into the filter through chemical and physical action to achieve the effect of purifying water quality. The structure of a multi-media filter is generally composed of multiple different media filter layers, which are filtered and absorbed according to different residues.
Second, the safety evaluation index of multi-media filter
1.Effluent water body:The effluent water body is one of the important indicators to evaluate the safety of multi-media filters. The effluent water body should be checked frequently, including turbidity, organic composition, heavy metal content and other data, to ensure that the effluent quality meets the required standards and requirements.
2.Compressive Performance:The multi-media filter should have a certain pressure resistance to bear a certain water pressure. When evaluating compressive performance, the material, construction, and sealing performance of the filter are checked to ensure that it does not leak or deform under normal operating conditions.
3.Backwash features:After a multi-media filter is operated for a long time, the filter layer will block many residues, resulting in increased filtration resistance. At this time, a backwash is performed to restore the characteristics of the filter. When evaluating the characteristics of backwashing, attention should be paid to the quality of backwashing water, backwashing intensity, backwashing duration and other factors to ensure that the backwashing effect is good and will not cause harm to the filter layer.
4.Microbiological indicators:For pure water production systems, microbial indicators are one of the important components of safety evaluation. The microbiological indicators of the filter should be checked frequently, including data such as total colony count, E. coli, etc., to ensure that the water is sterile or meets standard specifications.
5.Safe operation and maintenance:The safe operation and maintenance of multi-media filters is an important aspect to evaluate their safety. Formulate corresponding operation procedures and maintenance plans, standard operator behaviors and maintenance strategies to ensure the safe and stable operation of the filter.
3. Safety evaluation method of multi-media filter
1.Laboratory tests:Laboratory testing is one of the important means to evaluate the safety of multi-media filters. According to the detection and analysis of data such as water body, pressure resistance, backwash performance, etc., we can gain an in-depth understanding of the performance and quality of the filter.
2.Simulated operation test:Simulated operation tests are one of the methods used to test multi-media filters under practical operating standards. By simulating the operating process specification, the performance and safety of the filter in actual use can be more realistically reflected.
3.On-site inspection:On-site inspection is one of the real-time detection methods for multi-media filters in actual use. According to the timely and real-time detection and analysis of effluent water quality and equipment operation status, potential safety risks can be discovered and solved in time.