Decentralized two-stage sewage treatment by chemical-biological flocculation combined with microalgae biofilm for nutrient immobilization in a roof installed parallel plate reactor

Carlos Zamalloa, Nico Boon, Willy Verstraete

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

In this lab-scale study, domestic wastewater is subjected to a chemical biological adsorption (A-stage), followed by treatment in an innovative roof installed parallel plate microalgae biofilm reactor for nutrient immobilization (I-stage). The A-stage process was operated at a hydraulic retention time (HRT) of 1h and a solid retention time of 1day (FeSO4 as flocculant). The I-stage, which consequently received the effluent of the A-stage process, was operated at an HRT of 1day and exposed to natural light. The overall system removed on average 74% of the total chemical oxygen demand, 82% of the total suspended solids, 67% of the total nitrogen and 96% of the total phosphorous in the wastewater. The design involves a relatively low capital and operating cost which is in the order of 0.5€/m3 wastewater treated. These aspects suggest that the A/I process can be used as a decentralized domestic wastewater treatment system.

Original languageEnglish (US)
Pages (from-to)152-160
Number of pages9
JournalBioresource Technology
Volume130
DOIs
StatePublished - Feb 2013

Keywords

  • Algae
  • Green roofs
  • Municipal wastewater
  • Nutrient recovery
  • Photobioreactor

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