The invention relates to water conditioning constructional work in a water purification
plant and particularly relates to an air-flotation and membrane-
filtration purification
system which is divided into a water buffering region, a water distribution region, an air-flotation
contact region and an air-flotation separation and membrane-
filtration water outlet region, wherein a micro-bubble generating device and a gas-solublized water conveying pipeline are connected and distributed in the air-flotation
contact region; the air-flotation separation and membrane-
filtration water outlet region is provided with a conical mud bucket, a supporting beam and an immersed membrane module from bottom to top; a
slag scraping
machine is capable of walking on a guide rail distributed on the side wall of a
pool; a slagging groove is formed on a side wall opposite to the water inlet of the
pool. The air-flotation and membrane-filtration purification
system has the advantages of organically combining an air-flotation process with an
ultrafiltration membrane filtration process, being capable of treating low-
turbidity or high-
algae water, and meanwhile being small in occupied space, simple in structure, low in
civil engineering construction cost, high in
load resistance capacity, low in auxiliary water ratio, low in
operating cost and simple in
automatic control.