Pilot-scale experiment of down-flow hanging sponge for direct treatment of low-strength municipal wastewater in Bangkok, Thailand

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Publication Details

Author list: Onodera T., Yoochatchaval W., Sumino H., Mizuochi M., Okadera T., Fujita T., Banjongproo P., Syutsubo K.

Publisher: Springer

Publication year: 2014

Journal: Bioprocess and Biosystems Engineering (1615-7591)

Volume number: 37

Issue number: 11

Start page: 2281

End page: 2287

Number of pages: 7

ISSN: 1615-7591

eISSN: 1615-7605

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84919631771&doi=10.1007%2fs00449-014-1206-5&partnerID=40&md5=22d877a4d7b0e60fa6b169b7c2491f7e

Languages: English-Great Britain (EN-GB)

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Abstract

A pilot-scale experiment of a down-flow hanging sponge (DHS) reactor for treatment of low-strength municipal wastewater was conducted over 1 year in Bangkok, Thailand, to establish an appropriate method for treatment under tropical climate conditions. Municipal wastewater with an average BOD of 19 mg/L was fed directly into the DHS reactor. Superior effluent quality (5.1 ฑ 3.4 mg/L TSS, 21.1 ฑ 9.0 mg/L COD, 2.8 ฑ 1.4 mg/L BOD, and 4.1 ฑ 1.0 mg/L TN) was achieved at a hydraulic retention time (HRT) of 1 h under an average temperature of 30ฐC. The DHS reactor reached an actual HRT of 19.0 min, indicating good contact efficiency between wastewater and retained sludge. The DHS reactor retained dense sludge at 15.3-26.4 g VSS/L based on the sponge media volume. The sludge activity in terms of specific oxygen uptake rate was good. Excess sludge was produced as 0.051 g TSS/g COD removed (0.11 g TSS/g BOD removed), and a good SVI of 28 mL/g was observed. The sufficient performance was attributed to dense sludge with high activity, regardless of the low-strength wastewater. Overall, the DHS was advantageous owing to its simple operation, lack of operational problems, and low power consumption. ฉ 2014 Springer-Verlag.

Keywords

Down-flow hanging sponge, Low strength, Municipal wastewater treatment