How should we understand the “no-discrimination-inlet-water” principle of the 3-Free direct filtration technology?

Release time:

2026-04-13

“Non-discriminatory influent acceptance” is one of the most revolutionary features of the 3-Free Direct Filtration technology, meaning that the system exhibits exceptionally strong adaptability to influent water quality: regardless of influent concentration, particle size, or fluctuations in water quality, it can operate stably without requiring sophisticated pretreatment at the front end.

　　“Non-discriminatory influent acceptance” is one of the most revolutionary features of the Three-No Direct Filtration technology, meaning that the system exhibits exceptionally strong adaptability to influent water quality: regardless of concentration levels, particle size distribution, or fluctuations in water quality, it can operate stably without requiring sophisticated pretreatment at the front end.

　　This capability stems from ASSFBR’s unique “dynamic biofilm” filtration principle:

　　1. Adaptive Membrane Formation: The “dirtier” the water, the “tighter” the filtration.

　　When high-concentration influent passes through the filter element, suspended solids are rapidly intercepted and a sludge cake forms on the surface. The compactness of this sludge cake is directly proportional to the influent concentration: the more turbid the water, the faster and denser the cake forms, resulting in higher interception efficiency. Unlike conventional filters that are quickly clogged by large particles, the system “adapts” by dynamically adjusting the structure of the filtration layer.

　　2. Does not rely on aperture-based interception, with no risk of “jamming”

　　Traditional filtration relies on mechanical sieving with fixed pore sizes; once particles exceed the pore diameter, they immediately cause either surface clogging or deep-bed clogging. In contrast, the core filtering element in “three-no” direct filtration is the sludge membrane itself, with the filter cartridge serving merely as a supporting framework. Regardless of the size of the incoming particles, they are adsorbed and retained by the sludge membrane, eliminating the risk of the filter mesh becoming jammed or blocked.

　　3. Shock load resistance: Fluctuations in concentration do not affect the effluent quality.

　　When the influent SS suddenly spikes from 100 mg/L to 1,000 mg/L, conventional filters may clog immediately. In contrast, the “three-no” direct filtration system will:

　　·The sludge layer thickens more rapidly, the filtration layer becomes denser, and yet the effluent quality improves;

　　·The frequency of gravity-assisted self-cleaning increases, automatically discharging excess sludge;

　　·The system re-establishes stability through a dynamic equilibrium of “thickening–sloughing,” with virtually no impact on effluent quality.

　　4. “De-dependence” of pre-processing

　　Conventional depth filtration methods, such as MBR and sand filtration, impose stringent requirements on influent quality, necessitating meticulous pretreatment at the front end—including screens, primary sedimentation, and equalization tanks—otherwise the system is highly prone to failure. In contrast, the “three-no” direct filtration approach boasts the capability of handling influent without any pre-treatment:

　　·Can be directly connected to raw wastewater or effluent from the biochemical treatment tank, and can even handle combined sewer overflows;

　　·Simplify the process flow to reduce tank volume and equipment investment;

　　·Reduce design complexity and operational risk.

　　Real-world application scenarios:

　　Conclusion:

　　The essence of “non-discriminatory water intake” is to transform the “selectivity” of filtration into “adaptability.” Traditional technologies essentially “pick and choose” which water to treat, whereas the Three-No Direct Filtration technology can handle virtually any type of water. This not only significantly enhances the system’s stability and reliability but also grants users substantial flexibility and simplification in process design and operational management.

　　Mefit Water’s “three-no” direct filtration technology, with its inclusive “embracing all rivers” approach, is redefining the very boundaries of filtration.

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