Biotrickling Filtration of Biogas Produced from the Wastewater Treatment Plant of a Brewery

The performance of a lab-scale biotrickling filter treating ${\mathrm{H}}_2\mathrm{S}$ from biogas produced from an upflow anaerobic sludge bed reactor of the wastewater-treatment plant of a brewery was evaluated. A sulfide-oxidizing culture obtained from the anaerobic sludge of the same upflow anaerobic sludge bed reactor was immobilized on polyurethane foam. The nitrate and nitrite (final electron acceptor) depletion on the trickling medium resulted in remarkable destabilization in the performance of the system. The optimum temperature was in the range from 31 to 42°C ($\text{removal}\text{efficiency}=91.8\pm 5.5\%$). At a temperature of 22°C the removal efficiency reduced to 39% [$\text{inlet}\text{load}(\mathrm{IL})=5.3\mathrm{gS}\text{-}{\mathrm{H}}_2\mathrm{S}{\mathrm{m}}^{-3}{\mathrm{h}}^{-1}$, empty bed residence time $(\mathrm{EBRT})=2.9\min$]. Trickling liquid velocity (TLV) of 4.4, 7.4, and $11\mathrm{m}{\mathrm{h}}^{-1}$ did not affect the system at EBRT of 6.2 min ($\text{removal}\text{efficiency}=94.2\pm 1.3\%$, $\mathrm{IL}=1.86\pm 0.18\mathrm{gS}{\mathrm{m}}^{-3}{\mathrm{h}}^{-1}$). A TLV effect was observed at an EBRT of 1.6 min where the removal efficiency decreased from 50.9% ($4.4\mathrm{m}{\mathrm{h}}^{-1}$) to 33.7% ($7.3\mathrm{m}{\mathrm{h}}^{-1}$).