Effect of sponge volume on the performance of down-flow hanging sponge system treating UASB reactor effluent

A. Tawfik, A. Ohashi, H. Harada

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The performance of down-flow hanging sponge (DHS) system treating UASB reactor effluent at different sponge volume of 38.2, 28.7, 19.1 and 9.6% was investigated. The hydraulic retention time (HRT) and flow rate were kept constant at 2.6 h and 0.46 m3/day, respectively. The results obtained indicated that reducing the sponge volume of the DHS system from 38.2 to 19.1% significantly decreased the removal efficiency of CODtotal from 80 ± 8 to 62 ± 14%; CODsoluble from 71.2 ± 10 to 53.7 ± 18% and CODparticulate from 86 ± 10 to 62 ± 15%. With further reduction of the sponge volume down to 9.6%, the removal efficiency was dropped to 54 ± 15% for CODtotal; 44.1 ± 14% for CODsoluble and 42 ± 12% for COD particulate. Likewise, the nitrification efficiency and fecal coliform (FC) removal was strongly affected by decreasing the sponge volume of the DHS system, i.e., the nitrification efficiency was dropped by a value of 48.3% when reducing the sponge volume of the DHS system from 38.2 to 19.1%. At sponge volume of 38.2%, the DHS system removes 2.6 ± 0.3 log 10/100 ml of FC which is significantly higher than that at sponge volume of 28.7, 19.1 and 9.6%. Accordingly, it is recommended to design and operate such a system at a bulk sponge volume not exceeding 38.2% of the total reactor volume and at an HRT of 2.6 h.

Original languageEnglish
Pages (from-to)779-785
Number of pages7
JournalBioprocess and Biosystems Engineering
Volume33
Issue number7
DOIs
Publication statusPublished - 2010 Sep 1

Keywords

  • COD
  • DHS
  • Fecal coliform
  • Nitrification
  • Sponge volume
  • UASB

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering

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