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Environmental Engineering Research 2003;8(5): 259-272. DOI: https://doi.org/10.4491/eer.2003.8.5.259
CONTROL OF TWO-STAGE CYCLIC ANAEROBIC PROCESSES BASED ON OPTIMIZATION OF CYCLE TIME
Young-Tai Cho1, and James C. Young2
1Chung Cheong College, Cheongwon Kyn, Korea
2University of Arkansas, Fayetteville, AR, USA
Corresponding Author: Young-Tai Cho ,Tel: +82-43-230-2284, Fax: +82-43-230-2309, Email: choyt@ok.ac.kr
Received: August 6, 2003;  Accepted: November 8, 2003.
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ABSTRACT
A process control index is proposed for the determination of an optimum cycle time, which is a crucial control parameter of Two-Stage Cyclic (TSC) process. Experiments were performed in 13 Liter working volume hybrid anaerobic filter sets that were connected two reactors in series at several organic loading rates between 2.0-9.0 g soluble COD/L/day. The results indicated that the performance of the two-stage cyclic anaerobic filter system was closely related to the cycle time. The optimum cyclic time could be determined by using an operational index, [ S0rc/(M], which includes influent wastewater COD (S„), a cycle time ( rc), a hydraulic retention time (8), and biomass inventory (M). This optimum cycle time also corresponded to the time when the gas production in the second (follow) stage became less than 10% of the total gas production. Tracer tests also were conducted for the clean bed and dirty bed conditions. The results showed that the hydraulic pattern of the upflow hybrid anaerobic filters under normal operating conditions demonstrated performance similar to that of a plug flow reactor with strong dispersion. Therefore, biogas mixing and biomass accumulation under normal operating conditions had a significant effect on reactor hydraulics.
Keywords: Anaerobic filter | anaerobic treatment | methane formation | biogas | tracer test | two-stage
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BEHAVIOUR OF HIGH-RATE ANAEROBIC PROCESSES TREATING LANDFILL LEACHATE  2001 June;6(2)
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