Biological methane removal by groundwater trickling biofiltration for emissions reduction.

Methane removal is an essential step in drinking water production from methane-rich groundwaters. Conventional aeration-based stripping results in significant direct methane emissions, contributing up to one-third of a treatment plant's total carbon footprint. To address this, a full-scale trickling filter was operated for biological methane oxidation upstream of a submerged sand filter, and its performance was compared to a conventional aeration-submerged sand filtration set-up.

Biogenic iron oxides for phosphate removal.

Biogenic iron oxides (BioFeO) formed by sp. and sp. were compared with chemically formed iron oxides (ChFeO) for their suitability to remove and recover phosphate from solutions.

Reduced iron induced nitric oxide and nitrous oxide emission.

Formation of the greenhouse gas nitrous oxide in water treatment systems is predominantly studied as a biological phenomenon. There are indications that also chemical processes contribute to these emissions. Here we studied the formation of nitric oxide (NO) and nitrous oxide (N(2)O) due to chemical nitrite reduction by ferrous iron (Fe(II)).