Patent ID: 8920651

Claim:
A system for reducing contaminants in a wastewater stream comprising: an inlet system, wherein the inlet system receives a wastewater stream comprising one or more contaminants; one or more bioreactors coupled to the inlet system, wherein one or more of the bioreactors comprise: one or more substrates; one or more bacteria capable of reducing the concentration of contaminants in the wastewater stream, wherein one or more of the bacteria at least partially adhere to one or more of the substrates; a bioreactor inlet coupled to the inlet system, the bioreactor inlet being positioned below one or more of the substrates, wherein the wastewater stream enters the bioreactor through the bioreactor inlet during use; a bioreactor outlet system positioned above one or more of the substrates, wherein the bioreactor outlet system comprises a weir system and a bioreactor outlet conduit, wherein water in the bioreactor enters the weir system and passes through the weir system to the bioreactor outlet conduit; and an oxygen containing gas inlet coupled to one or more of the bioreactors, wherein during operation of the bioreactor oxygen containing gas passes through the oxygen containing gas inlet into one or more of the bioreactors.