Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas

Abstract Acidic biotrickling filters (BTF) can be used for simultaneous removal of hydrogen sulfide (H2S) and siloxane from biogas. In this study, the performance a BTF under different acidic pH conditions was investigated. The profile H2S showed that 90% achieved during first 0.4 m height with down-flow Decamethylcyclopentasiloxane (D5) decreased 34.5% to 15.6% when increased 0.88 3.98. Furthermore, high partition coefficient D5 obtained in higher condition attributed total ionic strength resulting addition sodium hydroxide solution mineral medium. linear increase mass transfer (kL) indicated recycling liquid accelerated BTF. Therefore, lower kL lead efficient D5. However, highly 0.9 blocked O2 gases liquid. Low sulfur oxidation activity low Acidithiobacillus sp. content also deteriorated biodegradation H2S. Operating at 1.2 optimal simultaneously removing siloxane.