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Recovery of UAPB from high organic load during startup for phenolic wastewater treatment

Author(s): Bakhshi Zeinab | Najafpour Ghasem | Navayi Neya Bahram | Kariminezhad Esmaeel | Pishgar Roya | Moosavi Nafise

Journal: Chemical Industry and Chemical Engineering Quarterly
ISSN 1451-9372

Volume: 17;
Issue: 4;
Start page: 517;
Date: 2011;
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Keywords: phenol | upflow anaerobic packed bed | biogas | biodegradation | startup

Biodegradation of synthetic wastewater containing phenol by upflow anaerobic packed bed reactor (UAPB) was studied in this work. The reactor was operated at a hydraulic retention time (HRT) of 24 h and under mesophilic (30±1ºC) conditions. The startup operation was conducted for 150 days; split into 4 phases. The phenol concentration was stepwise increased. The concentration of phenol in phases 1, 2, 3 and 4 were 100, 400, 700 and 1000 mg/l, respectively. In phase 1, the reactor reached steady state conditions on the 8th day with a phenol removal efficiency and biogas production rate of 96.8% and 1.42 l/d, respectively. For an increase of the initial phenol concentration in phase 2, a slight decrease in phenol removal efficiency was observed. Similar trends were observed in phases 3 and 4 of startup. Due to the high phenol concentration a sudden decrease in removal efficiency and biogas production was observed. The surviving microorganisms were gradually adapted and acclimated to high phenol concentrations. In phases 3 and 4, the phenol removal efficiency at steady state conditions were 98.4 and 98%, respectively. The maximum biogas production was observed at day 130 with a value of 3.57 l/d that corresponds to phenol concentration of 1000 mg/l.
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