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  • 1.
    Haddaway, Neal
    et al.
    Stockholm Environment Institute, Sweden.
    Johannesdottir, Solveig
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    Piniewski, Mikolaj
    Warsaw University of Life Sciences, Poland.
    Macura, Biljana
    Stockholm Environment Institute, Sweden.
    What ecotechnologies exist for recycling carbon and nutrients from domestic wastewater?: A systematic map protocol 09 Engineering 0907 Environmental Engineering2019In: Environmental Evidence, ISSN 2047-2382, E-ISSN 2047-2382, Vol. 8, no 1Article in journal (Refereed)
    Abstract [en]

    Background: Pollution of the Baltic Sea continues to be a problem. Major terrestrial sources of nutrient emissions to the Baltic Sea are agriculture and wastewater, both major causes of eutrophication. Wastewater contains nutrients and organic matter that could constitute valuable products such as agricultural fertilizers and source of energy. With the EU's action plan for circular economy, waste management and resource utilization is central. Thus the integration of resource recovery to wastewater management could create benefits beyond the wastewater sector. There is a growing interest in resource recovery from wastewater. However, there is no systematic overview of the literature on technologies to recover nutrients and carbon from wastewater sources done to date. Methods: This systematic map will identify a representative list of studies on ecotechnologies for reusing carbon and nutrients (nitrogen and phosphorus) from domestic wastewater, which includes e.g. sewage sludge and wastewater fractions. Searches will be performed in five bibliographic databases, one search engine and 38 specialist websites. Searches will mainly be performed in English, search for literature in specialist websites will also include Finnish, Polish and Swedish. Coding and meta-data extraction will include information on ecotechnology name and short description, reuse outcome (i.e. reuse of carbon, nitrogen and/or phosphorus), type of reuse (i.e. whether it is explicit or implicit), study country and location, latitude and longitude. All screening and coding will be done after initial consistency checking. The outcomes of this systematic map will be a searchable database of coded studies. Findings will be presented in a geo-informational system (i.e. an evidence atlas) and knowledge gaps and clusters will be visualised via heat maps.

  • 2.
    Macura, Biljana
    et al.
    Stockholm Environment Institute, Sweden.
    Johannesdottir, Solveig
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    Piniewski, Mikolaj
    Warsaw University of Life Sciences, Poland.
    Haddaway, Neal
    Stockholm Environment Institute, Sweden; University of Johannesburg, South Africa.
    Kvarnström, Elisabeth
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    Effectiveness of ecotechnologies for recovery of nitrogen and phosphorus from anaerobic digestate and effectiveness of the recovery products as fertilisers: A systematic review protocol2019In: Environmental Evidence, ISSN 2047-2382, E-ISSN 2047-2382, Vol. 8, no 1, article id 29Article in journal (Refereed)
    Abstract [en]

    Background: The regular addition of plant-available nutrients such as nitrogen and phosphorus, either as manufactured fertilisers or animal manure, to agricultural soils is needed for global food security. Increased recycling of nutrients back to agriculture from organic waste streams is necessary for increased rural-urban sustainability. Anaerobic digestion of sewage sludge and agricultural wastes is widely applied to stabilize the substrate and also capture its energetic value via biogas production. The liquid phase of anaerobic digestate is a concentrated source of nutrients to which nutrient recovery technologies can be applied. Two such promising technologies that could increase nutrient recycling from e.g. wastewater and thereby contribute to environmental amelioration are struvite precipitation and ammonia stripping. By combining anaerobic digestion and nutrient recovery technologies on the digestate, a treatment process that provides both renewable energy and plant nutrients is achieved. This review will examine the effectiveness of ecotechnologies for the recovery and reuse of nitrogen and phosphorus from anaerobic digestate with the aim of reducing the impact of waste on the environment. Methods: We will search for both academic and grey literature published after 2013. English language searches will be performed in 4 bibliographic databases, and Google Scholar, while searches in 41 specialist websites will be performed in English, Finnish, Polish and Swedish. Eligibility screening will be conducted at two levels: title and abstract and full text. Included eligible studies will be subject to a critical appraisal that will assess external and internal study validity. We will extract information on study characteristics, intervention, comparators, effect modifiers, and measured outcomes. Data synthesis will involve narrative synthesis of each included study of sufficient validity. Quantitative synthesis (i.e. meta-analysis) may be possible in cases where a sufficient number of studies report similar types of outcomes. © 2019 The Author(s).

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