Features: (1) energy efficient solid-liquid separation, suspended solids in the wastewater, colloidal substances, biological cell loss microflora and the purified water separately. Separation process is simple, small footprint, good water quality is generally not subject to tertiary treatment and reuse. (2) the biological treatment unit can be maintained at a high biomass concentration, so that the volume load is greatly improved, while the membrane separation efficiency, so that the processing unit of hydraulic retention time is greatly shortened, a corresponding reduction in the area of ??the bioreactor. [2] (3) Due to prevent the loss of various microflora, slow growth is conducive to the growth of bacteria (nitrification bacteria, etc.), so that a variety of metabolic processes in the system smoothly. [3] (4) to make some refractory organics molecules longer residence time is conducive to their decomposition. [5] As with other membrane technology filtration separation technology in the long-term operation, the film as a kind of filter media clogging the membrane by water running time gradually decreased effective backwashing and chemical cleaning can reduce flux the effective life of the decline, maintain MBR systems. 

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