Industrial Solid-Liquid Separation Selection Guide: How to Choose Between Filter Press and Bag Filter Reasonably?

Shanghai Junyi Filtration Equipment Co., Ltd. specializes in the R&D, production, sales and technical service of fluid solid-liquid separation equipment, providing stable and reliable filtration solutions for industries such as water treatment, chemical, food, pharmaceutical, mining, and oil for a long time. In response to the most common problem encountered by enterprises in equipment selection — how to choose between filter press and bag filter, we combine years of practical experience and product system to provide you with clear, directly implementable selection standards, helping enterprises reduce costs, improve efficiency and stabilize production.

1. First Look at Core Indicators: Distinguish the Two Types of Equipment in One Sentence

• Bag Filter: Suitable for working conditions with small flow rate and low solid content, mainly used for precision clarification and pre-treatment.
• Filter Press: Suitable for working conditions with large flow rate and high solid content, especially for scenarios with hourly flow rate ≥ 10m³ and solid content ≥ 1%.

Special Tip:

For scenarios with large flow rate but low solid content (such as beverages, dairy products), filter press is the preferred choice; although large-flow filters are feasible, the overall cost is higher.

2. Bag Filter: Application Scenarios and Advantages

Bag filter, with compact structure, easy installation and high filtration precision, is the first choice for small and medium flow rate precision filtration.

Applicable Industries

Food and beverage, water treatment, chemical, pharmaceutical, oil, rare earth non-ferrous metals, etc.

Core Advantages

• Flexible Material Options: Supports SS304/SS316 stainless steel, carbon steel, plastic, titanium alloy, meeting both conventional and highly corrosive working conditions.
• Wide Precision Coverage: Filter bags are available in PP, PE, PTFE, nylon mesh, etc., with temperature resistance ranging from 50℃ to 300℃, adapting to different media.
• Simple Maintenance: Quick bag replacement, low operating resistance, suitable for continuous production.
• Rich Configurations: Quick-open type, clamp type, flange type, tri-clamp type, meeting different requirements of food, chemical, high temperature and other industries.
• Liquid clarification, impurity removal, pre-treatment
• Low solid content, fine impurity particles
• Small flow rate, high precision requirements

Recommended Selection Scenarios

3. Filter Press: Application Scenarios and Advantages

Filter press is a deep solid-liquid separation equipment for high solid content and large flow rate materials, with controllable filter cake moisture content and large processing capacity.

Company’s Mainstream Models

• Chamber Filter Press: General-purpose model, filter cake moisture content about 75%, preferred for mining and environmental protection.
• Membrane Filter Press: Secondary squeeze dewatering, moisture content as low as 60%, preferred for rare metals/rare earth.
• Plate and Frame Filter Press: Easy filter cloth replacement, suitable for high-viscosity materials (paint, glue, oil).
• Round Filter Press: High pressure and high temperature resistance, drier filter cake, suitable for high-pressure working conditions such as ceramic mud.
• Closed Filter Press: Leak-proof and volatilization-proof, suitable for alcohol, acid-base, pungent odor media.
• Large Processing Capacity: Can meet the continuous treatment of large flow rate and high solid content materials.
• Thorough Dewatering: Low filter cake moisture content, reducing hazardous waste volume and transportation costs.
• High Degree of Automation: Supports automatic plate pulling, automatic slag discharge, filter cloth cleaning, flap, etc.
• Strong Material Adaptability: Polypropylene filter plates (for sewage), stainless steel filter plates (for chemical/food) are optional.
• Mine beneficiation, sewage treatment, chemical sludge dewatering
• Large flow rate, high solid content
• Requirement for drier filter cake

Core Advantages

Recommended Selection Scenarios

4. Direct Comparison: Quick Selection Judgment Table

5. Junyi Filtration Selection Suggestions

1. Determine the flow rate and solid content first, then select the equipment type.
2. For highly corrosive, high temperature, hygienic working conditions, SS316 stainless steel is preferred.
3. For mining/environmental protection, chamber filter press is preferred; for rare metals, membrane filter press is selected.
4. For oil industry, leaf filter is preferred; for pipeline protection, basket filter is preferred.
5. If you are unsure about the selection, provide the flow rate, solid content, medium, pH value and temperature, and we will provide a free solution.

6. About Shanghai Junyi Filtration

Shanghai Junyi Filtration Equipment Co., Ltd. focuses on the field of solid-liquid separation. Its products cover bag filters, basket filters, self-cleaning filters, leaf filters, plate and frame multi-layer filters, titanium rod filters, as well as chamber/membrane/plate and frame/round/closed filter presses. With stable quality, professional selection and quick response, we serve customers at home and abroad, including South America, South Africa, Russia, Europe and other regions.

If you need free selection, quotation and technical solutions, please feel free to contact us. Junyi Filtration will provide you with a more suitable, economical and stable solid-liquid separation solution.