Most COD was converted to biogas, which was
collected by the first three-phase separator at the 1st UASB. Water
and sludge were carried through the upflow pipe to the gas–liquid
separator by the biogas. At the separator, the water-sludge mixture
was separated from the gas and dropped directly into the mixed
zone at the bottom of the reactor, resulting in an internal circulation
flow [11–13]. In the 1st UASB, the waste was recycled from the
top to the bottom by a peristaltic pump, resulting in the sludge
being suspended in the reactor, which was known as the external
circulation system.
Most COD was converted to biogas, which wascollected by the first three-phase separator at the 1st UASB. Waterand sludge were carried through the upflow pipe to the gas–liquidseparator by the biogas. At the separator, the water-sludge mixturewas separated from the gas and dropped directly into the mixedzone at the bottom of the reactor, resulting in an internal circulationflow [11–13]. In the 1st UASB, the waste was recycled from thetop to the bottom by a peristaltic pump, resulting in the sludgebeing suspended in the reactor, which was known as the externalcirculation system.
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