The Principle of 3-Free direct filtration technology

Release time:

2026-04-11

The ASSFBR technology achieves a paradigm shift from "passive clogging-active cleaning" to "active balancing-natural renewal" through the synergistic effect of "dynamic mud film"

Principle of '3-Free' Direct Filtration Technology

The ASSFBR technology achieves a paradigm shift from "passive clogging-active cleaning" to "active balancing-natural renewal" through the synergistic effect of "dynamic mud film" and "gravity self-cleaning," in an exceptionally simple and ingenious manner. This delivers an ultimate filtration solution that is nearly maintenance-free, long-lasting, and cost-effective.

The "3-Free" direct filtration technology, namely ASSFBR technology, is our company's core patented technology. It revolutionizes traditional filtration methods by achieving a dynamic balance between "filtration" and "self-cleaning".

In-depth Analysis of the Technical Principles of ASSFBR

I. Core Technology: Dynamic Mud Film for High-Efficiency Separation

The ASSFBR (Artesian Suspended Solid Filtration Biological Reactor)) achieves efficient solid-liquid separation through specialized porous media filter elements. The process consists of two steps:

Media retention and bridging: Water flows vertically through the filter media, with larger particles being directly retained. Subsequently, fine particles form "bridges" within the media channels, creating a dense primary filtration layer.

2. Self-forming sludge film: Retained particles rapidly form a "sludge film" on the surface of the filter element. This sludge film itself serves as a more refined filtration layer, effectively intercepting smaller particles and ensuring clear effluent quality.

II. Core Innovation: Gravity Self-Cleaning Technology for Solving Clogging Challenges

Traditional filters become clogged due to continuous thickening of the sludge film, whereas the ASSFBR achieves sustained self-cleaning through its innovative structural design:

Vertical filter element: The filter element is placed vertically, allowing the mud film formed on its surface to simultaneously experience upward filtration adsorption force and downward gravitational force.
Dynamic equilibrium: When the mud film thickens to a point where its gravity exceeds the filtration adsorption force, it will automatically detach and fall off.
Stable operation: This cyclic "formation-degradation" process maintains the sludge film at an optimal thickness, thereby sustaining consistent filtration capacity and superior anti-clogging performance without external backwashing force.

III. Functional Expansion: Efficient Coupling of Sludge-water Separation and Biological Treatment

ASSFBR is not only a filter but also a bioreactor. Its unique structure (e.g., static influent flow and dual sludge discharge) provides an ideal environment for microbial growth, combining denitrification and nitrogen removal with preferential sludge discharge functions. This achieves high synergy between sludge-water separation and biochemical treatment, yielding performance comparable to MBR membrane systems while offering lower operating costs and simpler management.

Working Principle of ASSFBR