2nd Bioeconomy Congress, 12-13th September 2017, University of Hohenheim, Stuttgart, Germany201

Kokko, Marika

Rasi, Saija

Rintala, Jukka

Tampio, Elina

Jukuri

Primary treatment • Microfiltration and membrane techniques are tested for the enhanced separation of solids and nutrients from the wastewater before the biological treatment process instead of conventional primary settling • Recovery of solids and nutrients is tested, e.g., with microfiltration with and without polymers Circular economy through enhanced treatment of municipal wastewaters Elina Tampio1, Saija Rasi1, Marika Kokko2, Jukka Rintala2  1Natural Resources Institute Finland (Luke), Bio-based Business and Industry, P.O. Box 2, FI-00791 Helsinki, Finland 2Tampere University of Technology, Laboratory of Chemistry and Bioengineering, P.O. Box 541, FI-33101 Tampere, Finland  • This project aims to achieve circular economy concept by integrating the management and treatment of municipal wastewaters with biogas and fertilizer production • The conventional municipal wastewater treatment is focused and optimized in terms of nutrient and total solids removal. Nutrient circulation and energy efficiency are required to increase both economic and environmental sustainability of the overall process • Drivers for the concept are new wastewater treatment and biogas plant investments in an eco-industry park located in Tampere area, Finland (ECO3, www.eco3.fi)  Aeration • The increased separation of solids and nutrients in the first phase decreases the aeration required in the biological treatment Biogas • Biogas production of recovered sludge after microfiltration is tested in batch and continuous tests and compared with conventionally settled sludge Nutrients • Microfiltration concentrated solids and nutrients to the sludge more efficiently compared to conventional settling (Fig. 2) indicating increased fertilizer value Wastewater Treated water Nutrient products Sludge This project  is implemented in collaboration between Tampere University of Technology and Luke, and funded by the Ministry of the Environment of Finland. Travel grant from Oskar Öflunds Stiftelse sr is greatly acknowledged. Figure 2. Characteristics of conventionally settled sludge and microfiltered sludge. Microfiltration was tested in 13 conditions. • In batch tests, the microfiltered sludge had 5% higher methane production compared to settled sludge (Fig. 1)  • Possibilities for further nutrient processing of digestate nutrients will be further evaluated • Use of e.g. ammonia stripping, struvite recovery, evaporation, membrane separation 2.4 0.2  0.3 3.0 ± 0.27 0.3 ± 0.05 0.7 ± 0.18 01234TS (%) N (%TS) P (%TS)Settled sludge Microfiltered sludgeFigure 1. Methane production potential of conventionally settled sludge (354 m3/tVS) and microfiltered sludge (13 samples, 374 ± 26 m3/tVS). Standard deviation calculated for 13 different microfltration conditions, plotted in 5-day intervals. 01002003004000 5 10 15 20 25CH4 (m3/tVS) Days Settled sludgeMicrofiltered sludge

Circular economy through enhanced treatment of municipal wastewaters

http://jukuri.luke.fi/bitstream/10024/540585/1/Posteri_ProRavinne_1.pdf

Circular economy through enhanced treatment of municipal wastewaters

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