Outside cycle continuous biological aerated filter for composite fillers

Abstract

The invention provides an outside cycle continuous biological aerated filter for composite fillers. The outside cycle continuous biological aerated filter is characterized by comprising a filler washing part, wherein the filler washing part comprises a compressed air lift pipe, a compressed air supply unit, a filler washing unit, a washing wastewater discharge unit, a filler backflow unit and a material guide pipe, the inlet of the compressed air lift pipe is arranged at the bottom of a filler layer in the biological aerated filter, the outlet of the compressed air lift pipe is arranged outside the biological aerated filter, the outlet of the compressed air supply unit is opposite to the inlet of the compressed air lift pipe and is used for blowing the filler particles into the compressed air lift pipe for air-water washing, the filler washing unit is used for receiving filler particles conveyed by the compressed air lift pipe, the inner wall of the filler washing unit has a convex structure used for washing the filler through friction when the fillers fall, and the filler backflow unit is connected with the material guide pipe at the bottom of the washing part. The biological aerated filter can be used for washing the filler particles while working continuously, thus being capable of running constantly.

Description

technical field [0001] The invention relates to a composite filler external circulation continuous aerated biological filter, which belongs to the field of sewage and waste water treatment. Background technique [0002] my country is a country seriously short of water resources. However, in recent years, with the rapid development of social economy and the continuous increase of population, a large amount of untreated sewage and substandard wastewater has been discharged into the surrounding water environment, causing water pollution in our country. Seriously, the shortage of water resources is further exacerbated. Therefore, it is of great significance to protect the water environment and solve the water resource crisis to research and develop new sewage and wastewater treatment technologies, reduce the content of pollutants in sewage and wastewater, and realize the discharge of treated water up to the standard or resource utilization. [0003] Biological aerated filter is ...

AI Technical Summary

Problems solved by technology

However, after a long period of operation, the biofilm attached to the internal filler of the biological aerated filter will gradually thicken and age, resulting in a decrease in the oxygen transfer rate, mass transfer rate, and biofilm activity. The increase of intercepted substances will lead to the reduction of porosity between the internal fillers, or even blockage, the increase of head loss, the increase of energy consumption, and the reduction of treatment capacity. Therefore, the biological aerated filter needs to be backwashed regularly to restore the treatment capacity of the filter

Ordinary biological aerated filter needs to be stopped for separate backwashing. This backwashing method reduces the treatment capacity of the filter and also increases the operating burden. Moreover, the biological aerated filter needs a period of time for biological recovery after backwashing. Reach the treatment effect before backwashing, during which the effluent quality is unstable

In addition, due to the integrated design of the current continuous biological aerated filter, its construction, maintenance and management are inconvenient, the effective area and volume of the biological aerated filter are small, the processing capacity is poor, and the gradation, pores, film formation, and adsorption of the filler Performance is not optimized

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