Abstract

The paper compares the performance of two trickling filters (TFs) filled with plastic- or sponge-based packing media treating the effluent from an upflow anaerobic sludge blanket (UASB) reactor. The UASB reactor was operated with an organic loading rate (OLR) of 1.2 kgCOD m-3 d-1, and the OLR applied to the TFs was 0.30-0.65 kgCOD m-3 d-1 (COD: chemical oxygen demand). The spongebased packing medium (Rotosponge) gave substantially better performance for ammonia, total-N, and organic matter removal. The superior TF-Rotosponge performance for NH4 +-N removal (80-95%) can be attributed to its longer biomass and hydraulic retention times (SRT and HRT), as well as enhancements in oxygen mass transfer by dispersion and advection inside the sponges. Nitrogen removals were significant (15 mgN L-1) in TF-Rotosponge when the OLRs were close to 0.75 kgCOD m-3 d-1, due to denitrification that was related to solids hydrolysis in the sponge interstices. For biochemical oxygen demand removal, higher HRT and SRT were especially important because the UASB removed most of the readily biodegradable organic matter. The new configuration of the sponge-based packing medium called Rotosponge can enhance the feasibility of scaling-up the UASB/TF treatment, including when retrofitting is necessary.

Original languageEnglish (US)
Pages (from-to)1034-1042
Number of pages9
JournalWater Science and Technology
Volume67
Issue number5
DOIs
StatePublished - 2013

Fingerprint

Sewage sludge
sponge
Effluents
plastic
sludge
effluent
Plastics
Biological materials
Nitrogen removal
Retrofitting
Denitrification
Biochemical oxygen demand
Chemical oxygen demand
Advection
Ammonia
Hydrolysis
Biomass
Mass transfer
organic matter
Hydraulics

Keywords

  • Domestic wastewater
  • Packing media
  • Post-treatment
  • Trickling filter
  • UASB reactor
  • UASB/TF system

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

Cite this

Performance of plastic- and sponge-based trickling filters treating effluents from an UASB reactor. / Almeida, P. G S; Marcus, Andrew; Rittmann, Bruce; Chernicharo, C. A L.

In: Water Science and Technology, Vol. 67, No. 5, 2013, p. 1034-1042.

Research output: Contribution to journalArticle

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