TY - JOUR ID - 6832 TI - On-Line Measurement of Dissolved Methane Concentration During Methane Fermentation in a Loop Bioreactor JO - Iranian Journal of Chemistry and Chemical Engineering JA - IJCCE LA - en SN - 1021-9986 AU - Yazdian, Fatemeh AU - Shojaosadati, Seyed Abbas AU - Nosrati, Mohsen AU - Pesaran Hajiabbas, Mahdi AU - Malek Khosravi, Khosro AD - Biotechnology Group, Department of Chemical Engineering, Faculty of Engineering, Tarbiat Modares University, P.O. Box 14115-143 Tehran, I.R. IRAN Y1 - 2009 PY - 2009 VL - 28 IS - 4 SP - 85 EP - 93 KW - Dissolved methane KW - Semi-conductor sensor KW - On-line measurement KW - Loop bioreactor KW - Calibration DO - 10.30492/ijcce.2009.6832 N2 - A dissolved methane sensor based on silicone tube was designed, constructed and optimized.The silicone tube diameter, silicone tube length and helium flow rate (as the carrier gas(were considered as process parameters to be optimized.A continuous stream of helium (50 mL/min) was directed through the tubing, sweeping out the dissolved methane which diffused through the walls of the tubing from the fermentation broth. The probe was made of silicone rubber tubing, 10 cm in length with inner and outer diameters of 0.25 cm and 0.35 cm, respectively (Detakta Company; NO. 02502). A semi-conductor methane gas sensor (Figaro TGS 2611) - which is highly sensitive and selective to methane gas - was used to measure the dissolved methane continuously. Henry’s law along with a special circuit experimental method was applied for calibration. The output concentration was displayed in mg/l (or ppm) of dissolved gas. The accuracy and response time of this system are ± 2 % and 2 minutes, respectively. Moreover, a control system was installed for recycling methane gas during fermentation UR - https://ijcce.ac.ir/article_6832.html L1 - https://ijcce.ac.ir/article_6832_06dd0cd2c5055443ba702bf75cb4acdb.pdf ER -