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Evaluation of revolving algae biofilm reactors for nutrients and metals removal from sludge thickening supernatant in a municipal wastewater treatment facility.

Authors
  • Zhao, Xuefei1
  • Kumar, Kuldip2
  • Gross, Martin A3
  • Kunetz, Thomas E2
  • Wen, Zhiyou4
  • 1 Gross-Wen Technologies Inc, 2710 S. Loop Dr. Suite 2017, Ames, IA, 50010, USA.
  • 2 Metropolitan Water Reclamation District of Greater Chicago, 100 East Erie Street, Chicago, IL, 60611, USA.
  • 3 Gross-Wen Technologies Inc, 2710 S. Loop Dr. Suite 2017, Ames, IA, 50010, USA; Food Science and Human Nutrition, Iowa State University, 536 Farmhouse Ln, Ames, IA, 50011, USA.
  • 4 Gross-Wen Technologies Inc, 2710 S. Loop Dr. Suite 2017, Ames, IA, 50010, USA; Food Science and Human Nutrition, Iowa State University, 536 Farmhouse Ln, Ames, IA, 50011, USA. Electronic address: [email protected]
Type
Published Article
Journal
Water research
Publication Date
Oct 15, 2018
Volume
143
Pages
467–478
Identifiers
DOI: 10.1016/j.watres.2018.07.001
PMID: 29986255
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

This work is to evaluate pilot-scale Revolving Algal Biofilm (RAB) reactors of two heights (0.9-m and 1.8-m tall) to treat supernatant from sludge sedimentation at Metropolitan Water Reclamation District of Greater Chicago (MWRD) for removing nutrients (N and P) as well as various metals. The RAB reactors demonstrated a superior performance in N and P removal as compared to control raceway ponds. Taller 1.8-m RAB reactors performed better than 0.9-m RAB reactors in terms of total nutrient removal and algal biomass productivity. At 7-day HRT, total P (TP) and Total Kjeldahl N (TKN) removal efficiency reached to 80% and 87%, respectively, while ortho-P and ammonia removal efficiency reached to 100%. Decreasing HRT led to an enhanced TP and TKN removal rate and nutrient removal capacity. At HRT of 1.3-day, the TP removal per footprint of 1.8-m tall RAB reactors was around 7-times higher than the open pond system. The RAB reactors also showed certain capabilities of removing metals from wastewater. The study demonstrated that RAB-based treatment process is an effective method to recover nutrients from municipal wastewater. Copyright © 2018 Elsevier Ltd. All rights reserved.

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