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Long term trials with membrane bioreactor for enhanced wastewater treatment coupled with compact sludge treatment -pilot Henriksdal 2040, results from 2020
IVL Swedish Environmental Research Institute.
IVL Swedish Environmental Research Institute.
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2021 (English)Report (Other academic)
Abstract [en]

Stockholm’s wastewater treatment plant (WWTP) in is currently retrofitting from a conventional activated sludge process to a new membrane bioreactor (MBR) process. It also includes new treatment steps for sludge handling. Stockholm Vatten och Avfall (SVOA) and IVL have since 2014 conducted long-term MBR studies in pilot scale at the R&D facility Hammarby Sjöstadsverk. This report present results from the pilot operation during 2020. 

The MBR-pilot was continuously operated at a higher inflow than the design average flow. The average effluent concentration of nitrogen and phosphorus met the effluent requirements of the future WWTP also this year. A low consumption of phosphorus precipitation chemicals could be achieved mainly due to a high Bio-P activity. The pilot showed that glycerol can be a good temporary carbon source at Henriksdal WWTP during startup. 

Like previous years, the membranes in membrane tank 1 (MT1) was cleaned with oxalic acid and the membranes in MT2 with citric acid. Several tests to optimize the chemical consumption for membrane cleaning were performed. Recovery cleanings (RC) of the membranes were performed twice in 2020.

In the sludge pilot, a thermophilic and a mesophilic hydraulic retention time (HRT) crash test showed stable performance down to 4 days HRT. 

The overall resource consumption in the pilot showed that the optimization of phosphorus precipitation and membrane cleaning chemicals resulted in a significantly lower dosing than design values for the future Henriksdal WWTP. 

Abstract [sv]

Stockholms avloppsreningsverk (ARV) byggs för närvarande om från en konventionell aktivslamprocess till en ny membranbioreaktorprocess (MBR). Även nya behandlingssteg för slamhantering ingår. Stockholm Vatten och Avfall (SVOA) och IVL har sedan 2014 genomfört långtidsstudier i pilotskala vid FoU-anläggningen Hammarby Sjöstadsverk. Denna rapport presenterar resultat från pilotoperationen under 2020.

MBR-piloten drevs kontinuerligt vid ett högre inflöde än det genomsnittliga designflödet. Utsläppsvärden för fosfor och kväve underskreds även detta år. En låg förbrukning av fällningskemikalier i fosforreningen kunde uppnås främst på grund av en hög Bio-P-aktivitet. Piloten visade också att glycerol kan vara en bra tillfällig kolkälla vid Henriksdal WWTP under processuppstart.

Liksom tidigare år rengjordes membranen i membrantank 1 (MT1) med oxalsyra och membranen i MT2 med citronsyra. Flera tester för att optimera förbrukningen av kemikalierna för membranrengöring utfördes. Återhämtningsrengöring (RC) av membranen utfördes två gånger under 2020.

I slampiloten visade en termofil och mesofil krocktest med korta hydraulisk retentionstid (HRT) stabil prestanda ner till 4 dagars HRT.

Den totala resursförbrukningen i piloten visade att optimering av fosforutfällning och tvättkemikalier resulterade i en betydligt lägre dosering än designvärden för framtida Henriksdal WWTP.

Place, publisher, year, edition, pages
Stockholm: IVL Svenska Miljöinstitutet AB , 2021.
Series
B report ; B2425
Keywords [en]
MBR, wastewater, sludge, pilot, Hammarby Sjöstadsverk
Keywords [sv]
MBR, avloppsvatten, slam, pilot, Hammarby Sjöstadsverk
National Category
Water Engineering
Research subject
Water
Identifiers
URN: urn:nbn:se:ivl:diva-3801ISBN: 978-91-7883-305-4 (electronic)OAI: oai:DiVA.org:ivl-3801DiVA, id: diva2:1589519
Available from: 2021-08-31 Created: 2021-08-31 Last updated: 2021-08-31

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