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  • 1.
    Kazadi Mbamba, Christian
    et al.
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    Arnell, Magnus
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    Svedin, Christer
    Scandinavian Biogas Fuels, Sweden.
    Ejlertsson, Jörgen
    Scandinavian Biogas Fuels, Sweden.
    Jeppsson, Ulf
    Lund University, Sweden.
    Karlsson, Anna
    Scandinavian Biogas Fuels, Sweden.
    Modelling Industrial Symbiosis of BiogasProduction and Industrial WastewaterTreatment Plants – A Review2019Report (Other academic)
    Abstract [en]

    The present-day treatment of pulp and paper mill effluents can be significantly improvedby incorporating biogas production in the context of industrial symbiosis. In this work anew industrial symbiosis concept is presented, the focus being on modelling it in view ofprocess optimization, design improvement and adoption by the pulp and paper industry.The concept consists of a first stage in which pulp and paper mills effluents are treatedby high-rate anaerobic digestion in external circulation sludge bed (ECSB) reactors toproduce biogas. In the second stage the removal of organic matter contained in thedigestate stream occurs through aerobic activated sludge treatment, aiming to achievemaximum sludge production with minimum aeration requirements. This sludge shouldin the case study then be co-digested with fish-waste silage to yield methane for energyproduction, nutrients-rich reject water that can be recycled to the activated sludgetreatment for optimum microbial activities and, production of nutrient rich soilamendment. The overall research aim is to develop a mathematical model that describesthe relevant process units and the dynamics of the different processes involving organicmatter removal, biogas production and nutrients release. The review overall finds thatan integrated model is required to simulate this concept and should include recentdevelopments in activated sludge, anaerobic digestion and physico-chemical modelling.

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  • 2.
    Kazadi Mbamba, Christian
    et al.
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy. Lund University, Sweden.
    Lindblom, E.
    Lund University, Sweden; Stockholm Vatten Och Avfall, Sweden.
    Flores-Alsina, X.
    DTU Technical University of Denmark, Denmark.
    Tait, S.
    University of Southern Queensland, Australia.
    Anderson, S.
    Stockholm Vatten Och Avfall, Sweden.
    Saagi, R.
    Lund University, Sweden.
    Batstone, D. J.
    University of Queensland, Australia.
    Gernaey, K. V.
    DTU Technical University of Denmark, Denmark.
    Jeppsson, U.
    Lund University, Sweden.
    Plant-wide model-based analysis of iron dosage strategies for chemical phosphorus removal in wastewater treatment systems2019In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 155, p. 12-25Article in journal (Refereed)
    Abstract [en]

    Stringent phosphorus discharge standards (i.e. 0.15–0.3 g P.m −3 ) in the Baltic area will compel wastewater treatment practice to augment enhanced biological phosphorus removal (EBPR) with chemical precipitation using metal salts. This study examines control of iron chemical dosing for phosphorus removal under dynamic loading conditions to optimize operational aspects of a membrane biological reactor (MBR) pilot plant. An upgraded version of the Benchmark Simulation Model No. 2 (BSM2) with an improved physico-chemical framework (PCF) is used to develop a plant-wide model for the pilot plant. The PCF consists of an equilibrium approach describing ion speciation and pairing, kinetic minerals precipitation (such as hydrous ferric oxides (HFO) and FePO 4 ) as well as adsorption and co-precipitation. Model performance is assessed against data sets from the pilot plant, evaluating the capability to describe water and sludge lines across the treatment process under steady-state operation. Simulated phosphorus differed as little as 5–10% (relative) from measured phosphorus, indicating that the model was representative of reality. The study also shows that environmental factors such as pH, as well operating conditions such as Fe/P molar ratios (1, 1.5 and 2), influence the concentration of dissolved phosphate in the effluent. The time constant of simultaneous precipitation in the calibrated model, due to a step change decrease/increase in FeSO 4 dosage, was found to be roughly 5 days, indicating a slow dynamic response due to a multi-step process involving dissolution, oxidation, precipitation, aging, adsorption and co-precipitation. The persistence effect of accumulated iron-precipitates (HFO particulates) in the activated sludge seemed important for phosphorus removal, and therefore solids retention time plays a crucial role according to the model. The aerobic tank was deemed to be the most suitable dosing location for FeSO 4 addition, due to high dissolved oxygen levels and good mixing conditions. Finally, dynamic model-based analyses show the benefits of using automatic control when dosing chemicals. © 2019 Elsevier Ltd

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