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 536681
Title Improving the energy efficiency of a pilot-scale UASB-digester for low temperature domestic wastewater treatment
Author(s) Xu, Shengnan; Zhang, Lei; Huang, Shengle; Zeeman, Grietje; Rijnaarts, Huub; Liu, Yang
Source Biochemical Engineering Journal 135 (2018). - ISSN 1369-703X - p. 71 - 78.
Department(s) Sub-department of Environmental Technology
Meteorology and Air Quality
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Anaerobic domestic wastewater treatment - Energy saving - Low temperature - Methanogenic activity - UASB-digester

A pilot-scale UASB-Settler-Digester (USD) system was utilized to treat raw municipal wastewater collected from a sewer system at 10 °C. During the reactor operation, UASB sludge was continuously transferred from the UASB to a settler; concentrated sludge in the settler was then transferred to a digester operated at 35 °C. The results showed that the settler with a hydraulic retention time (HRT) of 3 h increased UASB sludge chemical oxygen demand (COD) concentration from 14.5 ± 2.5 g/L to 29.9 ± 4.1 g/L. With an HRT of 6 h, the USD system achieved a mean COD removal of 49.2%; and 23.9% influent COD was converted to methane. The specific methanogenic activities at 35 °C of the UASB and the digester sludge were 0.26 and 0.24 g CH4 COD/(g VSS d), respectively, and the stability values were 0.21 and 0.16 g CH4 COD/g COD, respectively. The stability of the settled sludge was similar to that of the recirculated UASB sludge. Compared to a UASB-digester system, the system with an added settler achieved similar COD removal and methane production, but reduced sludge recirculation rate (from 16% to 8% of the influent flow rate), which led to a 50% heating energy saving in the digester of the UASB-digester.

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