Electro-biochemical reactor
Electro-biochemical reactor (EBR) is a type of a bioreactor used in water treatment. EBR is a high-efficiency denitrification, metals, and inorganics removal technology that provides electrons directly to the EBR bioreactor as a substitute for using excess electron donors and nutrients.
Source: Wikipedia — Electro-biochemical reactor (CC BY-SA 4.0)