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Continuous microalgae-activated sludge flocs for remediation of municipal wastewater under low temperature
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (ACWA)ORCID iD: 0000-0002-0137-2194
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (ACWA)ORCID iD: 0000-0002-5014-3275
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. ABB AB. (ACWA)ORCID iD: 0000-0003-0274-4719
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (ACWA)ORCID iD: 0000-0003-3311-9465
2017 (English)In: / [ed] Peter Van der Steen, 2017, 1-8 p.Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The operational performance of indigenous microalgae-activated sludge was evaluated regarding the nutrient removal efficiency using raw wastewater collected from Västerås wastewater treatment plant, Sweden at limited artificial surface lighting (290 μmol m-1 sec-1) and Nordic wastewater conditions (13°C). Additionally, the oxygen production and consumption, biomass concentration and its settling was evaluated during the symbiotic algal-bacterial interaction. The results confirmed oxygenic organic compound removal (COD removal of 65-94%) at higher (31-45 d) and lower (13-18 d) sludge retention time (SRT). Also, a complete removal of ammonium throughout the process and partial nitrite-nitrate removal at all SRTs (total nitrogen removal of 41- 62%) were observed. Likewise, a partial phosphorus (P)removal was observed in the effluent which provides an opportunity to capture free P fromthe effluent for recovery as fertiliser. Further, the microalgal growth was slower due to lightor inorganic carbon limitation or ammonium repression caused by higher internal recirculationas observed from ammonium and nitrite-nitrate levels in the PBR. Most importantly, effectivePBR biomass concentration based nutrient removal and relative sludge recirculation have tobe considered in the PBR design to avoid light limitation and activate symbiosis.

Place, publisher, year, edition, pages
2017. 1-8 p.
Keyword [en]
Indigenous microalgae-activated sludge, Lighting, Nordic wastewater condition; Sludge retention time; Sludge recirculation
National Category
Environmental Engineering
Research subject
Biotechnology/Chemical Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-38020OAI: oai:DiVA.org:mdh-38020DiVA: diva2:1173541
Conference
1st IWA Conference on Algal Technologies for Wastewater Treatment and Resource Recovery
Available from: 2018-01-12 Created: 2018-01-12 Last updated: 2018-01-12

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Anbalagan, AnbarasanSchwede, SebastianLindberg, Carl-FredrikNehrenheim, Emma

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