Wastewater treatment system including multiple stages of alternate aerobic-anerobic bioreactors in series

摘要

Method and apparatus for the treatment of industrial or municipal wastewater including multiple series of alternating aerobic- anaerobic bioreactors in series. Each of such pairs includes fill supporting fixed film microorganisms. The wastewater from primary treatment flows into a first aeration bioreactor and downwardly through the fill where it is contacted by the microorganisms. The effluent is passed to the bottom of an anaerobic bioreactor for passage upwardly past submerged microorganisms affixed to the fill walls. Part of the nutrients in the wastewater are consumed in this first aerobic-anaerobic stage. The wastewater is then passed to a second and third aerobic-anaerobic bioreactor stage. Incremental consumption of organic nutrients, nitrification and denitrification occurs in each stage. Thereafter, it is subjected to tertiary treatment.