Development of a sixth-generation down-flow hanging sponge (DHS) reactor using rigid sponge media for post-treatment of UASB treating municipal sewage

•A down-flow hanging sponge (DHS) reactor with rigid sponge media was developed.•The hydraulic retention time (HRT) was 2h and the reactor was operated for 2y.•The DHS reactor performed satisfactorily, especially for nitrification.•The rigid sponge media gave a long HRT and a high biomass concentrat...

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Bibliographic Details
Published in:Bioresource technology 2014-01, Vol.152, p.93-100
Main Authors: Onodera, Takashi, Tandukar, Madan, Sugiyana, Doni, Uemura, Shigeki, Ohashi, Akiyoshi, Harada, Hideki
Format: Article
Language:English
Subjects:
Absorption
Anaerobic treatment
Anaerobiosis
Applied sciences
Biodegradation, Environmental
Biological and medical sciences
Biological Oxygen Demand Analysis
Biomass
Bioreactors
Biotechnology
Cities
Down-flow hanging sponge
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Media
Methods. Procedures. Technologies
Nitrification
Nitrogen - analysis
Nitrogen removal
Oxygen - analysis
Packing material
Pollution
Reactors
Sewage
Sewage - chemistry
Sewage treatment
Sponges
Temperature
Time Factors
Upflow anaerobic sludge blanket
Upflow anaerobic sludge blanket reactors
Various methods and equipments
Ventilation
Wastewaters
Water Purification - instrumentation
Water Quality
Water treatment and pollution
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Summary:•A down-flow hanging sponge (DHS) reactor with rigid sponge media was developed.•The hydraulic retention time (HRT) was 2h and the reactor was operated for 2y.•The DHS reactor performed satisfactorily, especially for nitrification.•The rigid sponge media gave a long HRT and a high biomass concentration.•Ventilation was required to obtain satisfactory DHS reactor performance. 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 10.6h (8.6h for UASB and 2h for DHS) when operated at 10–28°C. The system gave reasonable organic and nitrogen removal efficiencies. The final effluent had a total biochemical oxygen demand of only 12mg/L and a total Kjeldahl nitrogen content of 6mg/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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2013.10.106