Abstract: Media are described herein for the degradation and/or remediation of ammonium, ammonium containing contaminants and/or fluorochemicals. A medium, in some embodiments, comprises an electron donor, an electron acceptor comprising iron particles having a polymeric coating, and a Feammox bacterium and/or one or more enzymes capable of oxidizing the electron donor coupled with reduction of Fe(III) of the iron particles to Fe(II). The electron donor, in some embodiments, comprises ammonium, an ammonium containing compound, and/or molecular hydrogen. The medium, in some embodiments, further comprises a fluorochemical component, and the Feammox bacterium and/or one or more enzymes exhibit reductive dehalogenase activity capable of fluorochemical degradation in conjunction with oxidation of the electron donor and electron transfer to the electron acceptor.