Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 433665
Title The effect of sludge recirculation rate on a UASB-digester treating domestic sewage at 15 °C
Author(s) Zhang, L.; Hendrickx, T.L.G.; Kampman, C.; Zeeman, G.; Temmink, B.G.; Weiguang Li, ; Buisman, C.J.N.
Source Water Science and Technology 66 (2012)12. - ISSN 0273-1223 - p. 2597 - 2603.
DOI https://doi.org/10.2166/wst.2012.487
Department(s) Environmental Technology
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) afvalwaterbehandeling - afvalwater - rioolwater - huishoudens - anaërobe behandeling - anaërobe verteerders - slibvergisting - recirculatiesystemen - temperatuur - zuurstofbehoefte - biogas - concentratie - efficiëntie - waste water treatment - waste water - sewage - households - anaerobic treatment - anaerobic digesters - sludge digestion - recirculating systems - temperature - oxygen requirement - biogas - concentration - efficiency - waste-water treatment - anaerobic-digestion - low-temperature
Categories Waste Water Treatment
Abstract The anaerobic treatment of low strength domestic sewage at low temperature is an attractive and important topic at present. The upflow anaerobic sludge bed (UASB)-digester system is one of the anaerobic systems to challenge low temperature and concentrations. The effect of sludge recirculation rate on a UASB-digester system treating domestic sewage at 15 °C was studied in this research. A sludge recirculation rate of 0.9, 2.6 and 12.5% of the influent flow rate was investigated. The results showed that the total chemical oxygen demand (COD) removal efficiency rose with increasing sludge recirculation rate. A sludge recirculation rate of 0.9% of the influent flow rate led to organic solids accumulation in the UASB reactor. After the sludge recirculation rate increased from 0.9 to 2.6%, the stability of the UASB sludge was substantially improved from 0.37 to 0.15 g CH4-COD/g COD, and the bio­gas production in the digester went up from 2.9 to 7.4 L/d. The stability of the UASB sludge and bio­gas production in the digester were not significantly further improved by increasing sludge recirculation rate to 12.5% of the influent flow rate, but the biogas production in the UASB increased from 0.37 to 1.2 L/d. It is recommended to apply a maximum sludge recirculation rate of 2–2.5% of the influent flow rate in a UASB-digester system, as this still allows energy self-sufficiency of the system.
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