Browsing by Author "Sihvonen, Maija"

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    Jätevedenkäsittelyn energia- ja resurssitehokkuuden parantaminen dynaamisen prosessimallinnuksen avulla
    (2018-05-14) Sihvonen, Maija; Mikola, Anna; Insinööritieteiden korkeakoulu; Vahala, Riku
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    Microbial ecology of full-scale wastewater treatment systems in the Polar Arctic Circle: Archaea, Bacteria and Fungi
    (2018-02-02) Gonzalez-Martinez, Alejandro; Sihvonen, Maija; Munoz-Palazon, Barbara; Rodriguez-Sanchez, Alejandro; Mikola, Anna; Vahala, Riku; Department of Built Environment; Water and Environmental Eng.; University of Granada
    Seven full-scale biological wastewater treatment systems located in the Polar Arctic Circle region in Finland were investigated to determine their Archaea, Bacteria and Fungi community structure, and their relationship with the operational conditions of the bioreactors by the means of quantitative PCR, massive parallel sequencing and multivariate redundancy analysis. The results showed dominance of Archaea and Bacteria members in the bioreactors. The activated sludge systems showed strong selection of Bacteria but not for Archaea and Fungi, as suggested by diversity analyses. Core OTUs in influent and bioreactors were classified as Methanobrevibacter, Methanosarcina, Terrestrial Group Thaumarchaeota and unclassified Euryarchaeota member for Archaea; Trichococcus, Leptotrichiaceae and Comamonadaceae family, and Methylorosula for Bacteria and Trichosporonaceae family for Fungi. All influents shared core OTUs in all domains, but in bioreactors this did not occur for Bacteria. Oligotype structure of core OTUs showed several ubiquitous Fungi oligotypes as dominant in sewage and bioreactors. Multivariate redundancy analyses showed that the majority of core OTUs were related to organic matter and nutrients removal. Also, there was evidence of competition among Archaea and Fungi core OTUs, while all Bacteria OTUs were positively correlated among them. The results obtained highlighted interesting features of extremely cold temperature bioreactors.
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    Nitrogen and phosphorus harvesting from liquid waste using gas permeable hydrophobic membrane (GPHM) - NPHARVEST: – End-Product Market study
    (Aalto University, 2018) Pradhan, Surendra K.; Mikola, Anna; Sihvonen, Maija; Vahala, Riku; Rakennetun ympäristön laitos; Department of Built Environment; NPHarvest research group; Insinööritieteiden korkeakoulu; School of Engineering
    Nutrient recycling is an important segment of the circular economy. There are several techniques used in the field of nutrient recycling from different types of waste. Recently, nutrient recycling technique is receiving more attention on the production of mineral fertilizer from waste. Several types of mineral fertilizer products can be produced from waste but ammonium-based mineral fertilizers or ammonium sulfate is the dominant recycled mineral fertilizer. Our NPHarvest project also produces the ammonium-based fertilizer by harvesting nitrogen from waste. It also produces calcium, phosphate and organic matter based products. Besides the production of recycled fertilizers, it is very important to study the market potential of these recycled products to make this idea sustainable. This report covers the market potential of recycled mineral fertilizers in Finland. The study was carried out by gathering literature and contacting the stakeholders. Recycled liquid and granular ammonium sulfate are used in Finnish agriculture on a small scale. As sulfate is not suitable for Finnish soil the demand for ammonium sulfate fertilizers is small. This study found that ammonium nitrate has a higher market value compared to other recycled mineral fertilizers. Ammonium nitrate is highly demanded fertilizer for farmers as well as the large fertilizer companies like Yara international. This report will help the nutrients recycling sector to understand the market of different types of fertilizers in Finland so they can change their products and expand their market.
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    Nitrogen and phosphorus harvesting from liquid waste using membrane (GPHM) – Market potential study: NPHarvest technique - Market potential study
    (Aalto University, 2018) Pradhan, Surendra K.; Mikola, Anna; Sihvonen, Maija; Vahala, Riku; Rakennetun ympäristön laitos; Department of Built Environment; NPHarvest research group; Insinööritieteiden korkeakoulu; School of Engineering
    A large amount of liquid waste is produced in Finland, every year. Most of them are treated and released into nature, some of them treated and reused in the agriculture. There is still a need for a technique to treat high ammonium nitrogen containing wastewater. We have developed a new approach to harvest nitrogen (N) and phosphorus (P) from liquid waste called NPHarvest technique. The technique successfully harvests N and P from reject water, urine, compost exhaust air washer wastewater. After technical succession, we are interested to know the market potential for this technique. This study was conducted to understand the market potential of this technique. This market study was conducted by contacting different stakeholders involved in the wastewater treatment network, literature study. In this study, we have gathered information on liquid waste that contains the high concentrations of N and P in order to demonstrate the market size for the NPHarvest technique in Finland. NPHarvest studies the recovery of nutrients from liquid waste and the market potential of recovered nutrients.
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    Suomalaisen vesihuollon osaamisen vienti kehittyville markkinoille
    (2015-10-30) Sihvonen, Maija; Hyvärinen, Anne; Insinööritieteiden korkeakoulu; Lahdelma, Risto