Many sulfur-based denitrification
studies use a mix of sulfur and limestone or dolomite to buffer pH
and alkalinity decreases (Sahinkaya and Kilic, 2014; USEPA, 1978).
The presence of sulfur in the system combined with low-oxygen
conditions could also lead to sulfide production, though not as a
result of Eq. (1). An additional challenge is that elemental sulfur
is relatively water insoluble, meaning it has a limited microbial
availability at room temperature.