Journal
BIORESOURCE TECHNOLOGY
Volume 152, Issue -, Pages 93-100Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.10.106
Keywords
Down-flow hanging sponge; Packing material; Ventilation; Sewage treatment; Upflow anaerobic sludge blanket
Funding
- Grants-in-Aid for Scientific Research [23241029] Funding Source: KAKEN
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A sixth-generation down-flow hanging sponge reactor (DHS-G6), using rigid sponge media, was developed as a novel aerobic post-treatment unit for upflow anaerobic sludge blanket (UASB) treating municipal sewage. The rigid sponge media were manufactured by copolymerizing polyurethane with epoxy resin. The UASB and DHS system had a hydraulic retention time (HRT) of 10.6 h (8.6 h for UASB and 2 h for DHS) when operated at 10-28 degrees C. The system gave reasonable organic and nitrogen removal efficiencies. The final effluent had a total biochemical oxygen demand of only 12 mg/L and a total Kjeldahl nitrogen content of 6 mg/L. The DHS reactor gave particularly good nitrification performance, which was attributed to the new rigid sponge media. The sponge media helped to provide a sufficient HRT, and retained a high biomass concentration, extending the solids retention time. The DHS reactor maintained a high dissolved oxygen concentration under natural ventilation. (C) 2013 Elsevier Ltd. All rights reserved.
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