As a crucial terminal protection device in the water treatment process, with its high - precision filtration ability, it builds a secure defense line for core water treatment equipment, achieving efficient filtration and stable operation.

I. Product Introduction

The security (precision) filter is a high - precision water treatment device that adopts deep - layer filtration or surface filtration technology. It is usually installed before precision equipment such as reverse osmosis membranes and ultrafiltration membranes as a terminal filtration device. Inside the device, there are high - precision filter elements of different types, such as pleated filter elements and melt - blown filter elements. Its filtration precision can reach 0.1 - 5 microns, effectively intercepting residual tiny particles, colloids, rust, suspended solids, and microorganisms in water, preventing these impurities from entering subsequent precision equipment, avoiding blockage and scratching of membrane elements, extending the service life of the equipment, and ensuring the stable and efficient operation of the entire water treatment system. The device has a compact structure and is easy to operate. The filter element specifications and device models can be flexibly selected according to the actual water treatment volume and water quality requirements.

II. Working Process

1. Inflow of Pretreated Water: The water that has passed through pretreatment processes such as multimedia filtration and activated carbon adsorption is transported to the inlet of the security (precision) filter through pipes under the pressure of the water pump, ready for in - depth filtration treatment.

2. Precision Filtration Process: The water flow enters from the upper part of the filter and is evenly distributed outside the filter element. When the water passes through the filter element, tiny particles, colloids, rust, suspended solids, and some microorganisms in the water whose particle size is larger than the pore size of the filter element are intercepted by the physical interception and adsorption of the filter element. Among them, the pleated filter element increases the dirt - holding capacity by increasing the filtration area, and the melt - blown filter element uses a gradient pore structure to achieve hierarchical filtration from the outside to the inside, further improving the filtration efficiency.

3. Outflow of Purified Water: The purified water that has passed through the precision filtration of the filter element gathers from the inside of the filter element and flows out from the outlet at the bottom of the filter, entering subsequent precision water treatment equipment such as reverse osmosis and ultrafiltration, or directly used in production process steps with high water quality requirements.

4. Filter Element Replacement Prompt: As the filtration continues, impurities will be continuously intercepted on the surface and inside of the filter element, resulting in an increase in filtration resistance and an increase in the pressure difference between the inlet and outlet of the filter. When the pressure difference reaches the set value (generally 0.07 - 0.1MPa), or the effluent flow rate decreases significantly and the water quality deteriorates, it indicates that the filter element needs to be replaced in a timely manner to ensure the filtration effect and the normal operation of the system.

III. Product Features

IV. Technical Parameters

V. Application Fields

1. Industrial Production Water:

• Electronics Industry: In processes such as semiconductor chip manufacturing and liquid crystal display production, as a key filtration device for ultra - pure water preparation, it intercepts tiny particles and impurities in water, prevents them from contaminating precision electronic components, and ensures product quality and production yield.

• Pharmaceutical Industry: It is used for the filtration treatment of pharmaceutical water, effectively removing microorganisms, pyrogens, and particulate impurities in water, meeting the strict requirements of GMP for pharmaceutical water, and ensuring the safety of drug production.

• Chemical Industry: In processes such as chemical raw material purification and chemical synthesis, it filters process water, prevents impurities from affecting chemical reaction processes and product quality. At the same time, it is used for terminal filtration of chemical wastewater treatment to improve the effluent water quality.

2. Municipal Water Supply and Sewage Treatment:

• Municipal Waterworks: As a filtration device in the in - depth treatment process, it further removes residual tiny particles and microorganisms in water, improves the quality of the treated water, and ensures the safety of residents' drinking water.

• Sewage Treatment Plants: In the sewage reuse treatment process, it conducts precision filtration of the sewage treated by secondary treatment, reduces the content of suspended solids in the water, and makes the effluent meet the reuse standards for industrial circulating cooling water, municipal miscellaneous water, etc.

3. Food and Beverage Industry: It conducts precision filtration of production water, removes odors, impurities, and microorganisms in water, ensures the taste and hygiene safety of food and beverages, and meets food safety standards.

4. Laboratory and Scientific Research Fields: It provides high - precision purified water for laboratory analysis and testing, scientific research experiments, filters tiny particles and impurities in water that may affect experimental results, and ensures the accuracy and reliability of experimental data.

VI. FAQ

1. How often should the filter element of the security (precision) filter be replaced?The replacement cycle of the filter element is affected by factors such as raw water quality, water treatment volume, and filtration precision. When using general municipal tap water as raw water and with normal water treatment volume, the replacement cycle of filter elements with a precision of 0.1 - 1 micron is about 6 - 8 months; the replacement cycle of filter elements with a precision of 5 microns is about 8 - 12 months. If the raw water quality is poor or the water treatment volume is large, the replacement cycle should be shortened. When the pressure difference between the inlet and outlet of the filter reaches 0.07 - 0.1MPa, the filter element also needs to be replaced in a timely manner.

2. How to choose the appropriate filter element material?The selection of filter element materials needs to be determined according to raw water quality and treatment requirements. Polypropylene (PP) filter elements are low - cost and chemically corrosion - resistant, suitable for general water quality filtration; polyethersulfone (PES) filter elements have good hydrophilicity and high filtration efficiency, often used in scenarios with strict requirements for microorganisms and particulate impurities; nylon (PA) filter elements have high strength and good temperature resistance, suitable for high - temperature and high - pressure filtration environments.

3. Can the security (precision) filter be used alone?The security (precision) filter is usually used as the terminal filtration device of the water treatment system and is not recommended for single use. It needs to be used in conjunction with pretreatment equipment such as multimedia filters and activated carbon filters. First, remove larger - particle impurities in the water, and then conduct in - depth filtration through the security (precision) filter to achieve the desired water purification effect. Single use may cause the filter element to clog quickly, shorten the service.