Transient–state operation of an anoxic biotrickling filter for H2S removal

Gaseous emissions from wastewater facilities

“…Removal of H 2 S from gas streams using NO 3 -containing synthetic wastewater was investigated in an anoxic BTF fed with influent N/S loading ratios of 1.2-1.7 mol/mol (Khanongnuch, Di Capua, Lakaniemi, Rene, & Lens, 2019). A maximum elimination capacity of 19.2 g S/m 3 /hr was achieved under autotrophic conditions but decreased in the mixotrophic conditions as the NO 3 elimination capacity picked up from 9.9 to 11 g NO 3 -N/m 3 /hr.…”

Hazardous wastes treatment technologies

“…(98%–100% similarity) was the only sulfur‐oxidizing nitrate‐reducing bacterium detected in the BTF biofilm. In another paper, Khanongnuch, Capua, Lakaniemi, Rene, and Lens (2019) reported that liquid flow rate affected the pH and removal in the liquid phase. Wet–dry bed operation at 2–2 h and 24–24 h reduced H 2 S removal capacity by 60%–80%.…”

Interactions of the sulfur and nitrogen cycles: microbiology and process technology

“…sulfide or thiosulfate) sulfur source. In contrast, nitrates have to be added when sulfide removal is the objective (Khanongnuch et al, 2019c). In the latter case, one must consider that there is no net sulfur removal because sulfide is converted into elemental sulfur or sulfate.…”

“…Adding acetate at a C/N ratio of 0.2 stimulated the growth and activity of heterotrophic denitrifiers in the BTF, but biomass accumulation in the filter bed occurred causing a reduction of the HRT and subsequently to insufficient nitrate for oxidizing the H 2 S load. Moreover, Khanongnuch et al (2019b) evaluated the performance of a BTF testing different liquid flow rates, wet and dry operation and sulfide shock loads. They showed that wet-dry bed operations at 2-2 h and 24-24 h reduced the H 2 S removal efficiency to 60-80%, while wet-dry operation in a cycle of 1-1 h and 12-12 h did not have much effect.…”