Oxidation of hydrogen sulfide in biogas using dissolved oxygen in the extreme acidic biofiltration operation

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• 作者：Boonya Charnnok^a ; Thunwadee Suksaroj^a ; Piyarat Boonswang^b ; Sumate Chaiprapat^c ; ^d ; ^{sumate.ch@psu.ac.th}
• 关键词：Biofilter ; Hydrogen sulfide ; Biogas ; pH ; Dissolved oxygen
• 刊名：Bioresource Technology
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：131
• 期：Complete
• 页码：492-499
• 全文大小：484 K

文摘

This work aimed to investigate the interactive effects of empty bed retention time (EBRT), specific hydraulic loading rate (q) and initial pH (pH_i) of the aerated recirculating liquid to remove H₂S in extreme acidic biofiltration. Biogas containing H₂S 6395 ¡À 2309 ppm and CH₄ 79.8 ¡À 2.5 % was fed to the biofilter as pH of the high dissolved oxygen recirculating liquid swung between pH_i to 0.5. Response surface methodology was employed that gave the H₂S removal relationship model with R² 0.882. The predicted highest H₂S removal within the studied parameter ranges was 94.7 % at EBRT 180.0 s, q 4.0 m³/m²/h and pH_i 3.99. Results from separate runs at a random condition were not statistically different from the model prediction, signifying a validity of the model. Additionally, CH₄ content in the exit biogas increased by 4.7 ¡À 0.4 % . Acidithiobacullus sp. predominance in the consortia of this extreme acidic condition was confirmed by DGGE.