What is Industrial Water Filtration Equipment?

There are many types of industrial water filtration equipment. According to different filtration principles, application scenarios and precision requirements, they can be divided into the following categories:

Classification by filtration principle

(1) Mechanical filter

- Multi-media filter: Use filter materials of different particle sizes, such as quartz sand and anthracite, to remove suspended matter, colloids, etc.

- Activated carbon filter: Adsorbs organic matter, residual chlorine, odor, and heavy metals.

- Disc filter: Forms a filtration channel through stacking and extrusion, suitable for large flow pretreatment.

- Bag filter: Uses filter bags to intercept particles, is easy to ｒｅｐｌａｃｅ, and is suitable for medium precision filtration.

(2) Membrane separation technology

- Microfiltration (MF): Pore size 0.1~10 microns, used to remove suspended matter and bacteria.

- Ultrafiltration (UF): Pore size 0.01~0.1 microns, can intercept colloids and large molecular organic matter.

- Nanofiltration (NF): Pore size 1~10 nanometers, removes some heavy metals and hardness ions.

- Reverse osmosis (RO): pore size <1 nanometer, removes dissolved salts and small molecular organic matter, used for seawater desalination and ultrapure water preparation.

(3) Ion exchange equipment

- Remove calcium, magnesium (softening), heavy metals, or specific ions (such as nitrates) from water through resin.

(4) Electrochemical equipment

- Electrodeionization (EDI): Combines electrodialysis and ion exchange for ultrapure water preparation.

- Electrocoagulation: Removes heavy metals, colloids, etc. through electrolysis.

Classification by application scenario

(1) Pretreatment equipment

- Such as sand filters and carbon filters, used to protect subsequent precision equipment (such as RO membranes).

(2) Process water treatment

- Circulating water filtration: Remove impurities from cooling water and boiler water (such as side stream filters).

- Process water: High-purity water equipment in the electronics and pharmaceutical industries (such as RO+EDI).

(3) Wastewater treatment

- Deep filtration: Fiber bundle filters, magnetic separation equipment, etc.

- Sludge dewatering: plate and frame filter press, belt filter press.

(4) Special industries

- Food and beverage: diatomaceous earth filter, ceramic membrane.

- Petrochemical: high-pressure reverse osmosis, corrosion-resistant filter.

Classification by degree of automation

- Manual filter: requires manual cleaning or replacement of filter media (such as a simple sand filter).

- Fully automatic filter: automatic backwashing (such as a self-cleaning filter, fully automatic water softener).

Examples of common equipment

- Self-cleaning filter: keeps the filter clean by brushing or backwashing, suitable for high turbidity water.

- Centrifugal filter: uses centrifugal force to separate particles, often used in agricultural irrigation.

- Ultraviolet (UV) filter: sterilizes and disinfects, used in conjunction with other filters.

- Membrane bioreactor (MBR): combines biological treatment and ultrafiltration membrane for sewage treatment.

Selection points

- Water quality requirements: such as suspended matter content, soluble pollutants, pH value, etc.

- Flow demand: processing scale (tons/hour).

- Maintenance cost: filter material replacement frequency, energy consumption, degree of automation.

- Industry standards: For example, medicine needs to comply with GMP, and the electronics industry needs ultrapure water.

The industrial filtration requirements of different industries (such as electricity, chemicals, and food) vary greatly, and the equipment combination needs to be matched according to the specific scenario. For example, the semiconductor industry may require "multi-media filtration + RO + EDI", while the circulating cooling water system may only require sand filtration + side stream filtration.