The UASB (Up-flow Anaerobic Sludge Blanket) reactor is invented in 1970s by Professor Lattinga in Wageningen University in the Netherlands. It is a milestone in the development of anaerobic reactors and is by far the most widely used and most practical anaerobic reactor. Due to its low-rise structure, UASB is especially suitable for concrete pools.
Wastewater passes through main pipe, branch pipes and water distributor and finally enters the reactor. Then it flows up and passes through a granular sludge blanket，where hydrolyzed organic pollutants are converted into methane and carbon dioxide. At the top of the reactor, the three-phase separator retains the solid granular sludge with good settling characteristics in the reactor while clean water flows out, and the biogas is collected by the gas-collector. In this way, hydraulic retention time and sludge retention time are distinguished from each other.
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