Protection of biomass from snail overgrazing in a trickling filter using sponge media as a biomass carrier: Down-flow hanging sponge system

Takashi Onodera, Kazuaki Syutsubo, Wilasinee Yoochatchaval, Haruhiko Sumino, Motoyuki Mizuochi, Hideki Harada

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

This study investigated down-flow hanging sponge (DHS) technology as a promising trickling filter (TF) using sponge media as a biomass carrier with an emphasis on protection of the biomass against macrofauna overgrazing. A pilot-scale DHS reactor fed with low-strength municipal sewage was operated under ambient temperature conditions for 1 year at a sewage treatment plant in Bangkok, Thailand. The results showed that snails (macrofauna) were present on the surface of the sponge media, but could not enter into it, because the sponge media with smaller pores physically protected the biomass from the snails. As a result, the sponge media maintained a dense biomass, with an average value of 22.3 gVSS/L sponge (58.1 gTSS/L sponge) on day 370. The snails could graze biomass on the surface of the sponge media. The DHS reactor process performance was also successful. The DHS reactor requires neither chemical treatments nor specific operations such as flooding for snail control. Overall, the results of this study indicate that the DHS reactor is able to protect biomass from snail overgrazing.

Original languageEnglish
Pages (from-to)518-523
Number of pages6
JournalWater Science and Technology
Volume71
Issue number4
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Down-flow hanging sponge (DHS)
  • Macrofauna
  • Overgrazing
  • Snail
  • Sponge media
  • Trickling filter

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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