HSASBanaerobic reactor

HSASB consists of three parts: sludge reaction zone, gas-liquid solid three-phase separator (including sedimentation zone), and gas chamber. There is a large amount of anaerobic sludge stored in the bottom reaction zone, and sludge with good sedimentation and coagulation properties forms a sludge layer in the lower part. The sewage to be treated flows from the bottom of the anaerobic sludge bed and mixes with the sludge in the sludge layer. The microorganisms in the sludge decompose the organic matter in the sewage and convert it into biogas. Biogas is continuously released in the form of tiny bubbles, which merge and gradually form large bubbles during their ascent. In the upper part of the sludge bed, due to the agitation of biogas, a sludge with a relatively thin concentration rises together with water and enters the three-phase separator. When biogas encounters the reflection plate at the lower part of the separator, it bends around the reflection plate and then enters the gas chamber through the water layer. It is concentrated in the gas chamber and discharged through a conduit. The solid-liquid mixture is reflected and enters the sedimentation zone of the three-phase separator. The sludge in the sewage undergoes flocculation, and the particles gradually increase and settle under heavy force. The sludge settled on the inclined wall slides back into the anaerobic reaction zone along the inclined wall, causing a large amount of sludge to accumulate in the reaction zone. The treated effluent separated from the sludge overflows from the upper part of the sedimentation area overflow weir and is then discharged from the sludge bed.