Anaerobic microorganism treatment is an indispensable treatment section in the treatment process of high concentration organic wastewater. It can not only reduce energy consumption, but also produce biogas as for secondary utilization. The volume load of anaerobic reaction is high, the better oxygen reaction is much higher, and the investment for treating the same amount of COD is lower.
At present, the commonly used anaerobic treatment processes are UASB, EGSB, CSTR, IC, ABR, UBF, etc. Other anaerobic treatment processes include: AF, AFBR, USSB, AAFEB, usr, fpr, two-phase anaerobic reactor, etc.
1. UASB - upflow anaerobic sludge bed reactor
UASB is the abbreviation of up flow anaerobic sludge bed / blanket. It is called up flow anaerobic sludge bed reactor, which is an anaerobic biological method for sewage treatment, also called up flow anaerobic sludge bed. It was invented by Professor lettinga of the Netherlands in 1977.
UASB consists of sludge reaction area, gas-liquid solid three-phase separator (including sedimentation area) and gas chamber. A large amount of anaerobic sludge is left in the bottom reaction area, and sludge with good sedimentation and coagulation properties forms a sludge layer at the bottom. The sewage to be treated flows from the bottom of the anaerobic sludge bed to mix and contact with the sludge in the sludge layer. The microorganism in the sludge decomposes the organic matter in the sewage and converts it into biogas. Biogas is continuously released in the form of micro bubbles. During the rising process, the micro bubbles merge and gradually form larger bubbles. In the upper part of the sludge bed, due to the agitation of biogas, a sludge with thinner sludge concentration rises together with water into the three-phase separator. When biogas touches the reflection plate at the lower part of the separator, it bends around the reflection plate, and then enters the air chamber through the water layer, Concentrated in the gas chamber, the biogas is led out by a conduit. The solid-liquid mixture is reflected into the sedimentation area of the three-phase separator. The sludge in the sewage is flocculated, and the particles gradually increase, and settle under the effect of gravity. The sludge deposited on the inclined wall slides back to the anaerobic reaction area along the inclined wall, so that a large amount of sludge is accumulated in the reaction area, and the treated water separated from the sludge overflows from the upper part of the overflow weir in the sedimentation area, and then discharged into the sludge bed.
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