The invention belongs to the technical field of
environmental engineering sewage treatment, and in particular relates to an integral air-lift circumfluent suspended filler dispersed
sewage biological treatment device. The device integrates four functional units, which respectively are an anoxia
biological regulation tank, a suspended filler
biological reaction tank, a secondary
sedimentation tank and a mud
storage tank. The round vertical flow type secondary
sedimentation tank is arranged at the middle part of a reactor, other three functional units are located around the central secondary
sedimentation tank in radiating way, and the appearance of the entire device is in cylindrical structure. Rural dispersed domestic
sewage enters into the anoxia
biological regulation tank uniformly through a pipeline, is subject to hydrolyzation and acidification, lifted into the suspended filler
biological reaction tank by a sewage air-lifter, spherical suspended filler with
filling ratio of 40-50% is thrown in the suspended filler
biological reaction tank, enters into the central secondary sedimentation tank through a barrier mesh at the drain hole,
sediment water and mud are separated, mud is collected by a triangular-notch weir and water is discharged via a water collecting
sump.
Nitrification liquid in the suspended filler biological reaction tank reflows into the anoxia
biological regulation tank via a
nitrification liquid air-lifter for
denitrification by utilizing influent organic
carbon source.
Sediment mud in the secondary sedimentation tank enters into the mud
storage tank via a mud air-lifter, and the mud drainage period is long. The invention utilizes the anoxia biological regulation tank to achieve functions of removing organic substances and denitrifying; the compact integral structure occupies a small area of land;
system equipments are few, thus investment and running cost are little; the invention is suitable for rural dispersed domestic
sewage treatment.