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Bonassa, G.; Bolsan, A.C.; Hollas, C.E.; Venturin, B.; Candido, D.; Chini, A.; De Pra, M.C.; Antes, F.G.; Campos, J.L.; Kunz, A. |
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Title |
Organic carbon bioavailability: Is it a good driver to choose the best biological nitrogen removal process? |
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Year |
2021 |
Publication |
Science Of The Total Environment |
Abbreviated Journal |
Sci. Total Environ. |
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786 |
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147390 |
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Keywords |
Economic viability; Anammox-based process; Biodegradable organic carbon concentration; Nitrogen removal process; Nitrification; denitrification |
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Organic carbon can affect the biological nitrogen removal process since the Anammox, heterotrophic and denitrifying bacteria have different affinities and feedback in relation to carbon/nitrogen ratio. Therefore, we reviewed the wastewater carbon concentration, its biodegradability and bioavailability to choose the appropriate nitrogen removal process between conventional (nitrification-denitrification) and Anammox-based process (i.e. integrated with the partial nitritation, nitritation, simultaneous partial nitrification and denitrification or partial-denitrification). This review will cover: (i) strategies to choose the best nitrogen removal route according to the wastewater characteristics in relation to the organic matter bioavailability and biodegradability; (ii) strategies to efficiently remove nitrogen and the remaining carbon from effluent in anammox-based process and its operating cost; (iii) an economic analysis to determine the operational costs of two-units Anammox-based process when compared with the commonly applied one-unit Anammox system (partial-nitritation-Anammox). On this re-view, a list of alternatives are summarized and explained for different nitrogen and biodegradable organic carbon concentrations, which are the main factors to determine the best treatment process, based on operational and economic terms. In summary, it depends on the wastewater carbon biodegradability, which implies in the wastewater treatment cost. Thus, to apply the conventional nitrification/denitrification process a CODb/N ratio higher than 3.5 is required to achieve full nitrogen removal efficiency. For an economic point of view, according to the analysis the minimum CODb/gN for successful nitrogen removal by nitrification/denitrification is 5.8 g. If ratios lower than 3.5 are applied, for successfully higher nitrogen removal rates and the economic feasibility of the treatment, Anammox-based routes can be applied to the wastewater treatment plant. |
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0048-9697 |
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WOS:000687095700013 |
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UAI @ alexi.delcanto @ |
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1459 |
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Gimeno, F.; Galleguillos, M.; Manuschevich, D.; Zambrano-Bigiarini, M. |
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A coupled modeling approach to assess the effect of forest policies in water provision: A biophysical evaluation of a drought-prone rural catchment in south-central Chile |
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2022 |
Publication |
Science Of The Total Environment |
Abbreviated Journal |
Sci. Total Environ. |
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830 |
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154608 |
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Hydrological model; Land-use model; Policy environmental assessment; Remote sensing |
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The effect of different forest conservation policies on water provision has been poorly investigated due to a lack of an integrative methodological framework that enables its quantification. We developed a method for assessing the effects of forest conservation policies on water provision for rural inhabitants, based on a land-use model coupled with an ecohydrological model. We used as a case study the Lumaco catchment, Chile, a territory dominated by native forests (NF) and non-native tree farms, with an extended dry period where nearly 12,600 people of rural communities get drinking water through water trucks. We analyzed three land-use policy scenarios: i) a baseline scenario based on historical land-cover maps; ii) a NF Recovery and Protection (NFRP) scenario, based on an earlier implementation of the first NF Recovery and Forestry Development bill; and iii) a Pristine (PR) scenario, based on potential vegetation belts; the latter two based on Dyna CLUE, and simulated between 1990 and 2015. Impacts on water provision from each scenario were computed with SWAT. The NFRP scenario resulted in an increase of 6974 ha of NF regarding the baseline situation, and the PR scenario showed an increase of 26,939 ha of NF. Despite large differences in NF areas, slight increases in inflows (Q) were found between the NFRP and the PR scenarios, with relative differences with respect to the baseline of 0.3% and 2.5% for NFRP and PR, respectively. Notwithstanding, these small differences in the NFRP scenario, they become larger if we analyze the cumulative values during the dry season only (December, January, and February), where they reach 1.1% in a normal year and 3.1% in a dry year. Flows increases were transformed into water truck costs resulting in up to 441,876 USD (monthly) of fiscal spending that could be avoided during a dry period. |
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0048-9697 |
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UAI @ alexi.delcanto @ |
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1564 |
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McFadden, M.; Loconsole, J.; Schockling, A.; Nerenberg, R.; Pavissich, J.P. |
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Comparing peracetic acid and hypochlorite for disinfection of combined sewer overflows: Effects of suspended-solids and pH |
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2017 |
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Science Of The Total Environment |
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Sci. Total Environ. |
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599 |
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533-539 |
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PAA; Chlorine; Combined sewer overflows; Suspended solids; Disinfection |
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Peracetic acid (PM) is an alternative disinfectant that may be effective for combined sewer overflow (CSO) disinfection, but little is known about the effect of particle size on PM disinfection efficiency. In this work, PM and hypochlorite were compared as disinfectants, with a focus on the effect of wastewater particles. Inactivation experiments were conducted on suspended cultures of Escherichia coli and wastewater suspended solids. Tested size fractions included particle diameters <10 μm, <100 μm, and raw wastewater. Chlorine disinfection efficiency decreased with increasing solids size. However, solids size had little effect on PM disinfection. The PM disinfection efficiency decreased at pH values above 7.5. Live/dead staining revealed that PM disinfection leaves most cells in a viable but non-culturable condition. Fourier transform infrared spectroscopy (FTIR) analyses suggests that PAA and hypochlorite may inactivate E. coli bacteria by similar mechanisms. (C) 2017 Elsevier B.V. All rights reserved. |
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[McFadden, M.; Loconsole, J.; Schockling, Aj.; Nerenberg, R.; Pavissich, J. P.] Univ Notre Dame, Dept Civil & Environm Engn & Earth Sci, Notre Dame, IN 46556 USA, Email: juan.pavissich@uai.cl |
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Elsevier Science Bv |
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English |
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0048-9697 |
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WOS:000405252000057 |
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UAI @ eduardo.moreno @ |
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829 |
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Schmidt-Rivera, X.S.; Rodgers, B.; Odanye, T.; Jalil-Vega, F.; Farmer, J. |
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The role of aeroponic container farms in sustainable food systems – The environmental credentials |
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2023 |
Publication |
Science Of The Total Environment |
Abbreviated Journal |
Sci. Total Environ. |
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860 |
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160420 |
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Vertical farming; Controlled environment agriculture; Life cycle assessment (LCA); Climate change; Food security; Food supply chains |
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Sustainable food production and consumption are key to face the current climate and environmental crisis, hence innovation to produce food with lower impacts are taking more attention. Controlled environment agriculture, also known as vertical farming, is seen as one innovative approach to reduce impacts of producing food while also improv-ing food security. Aeroponic is one of such innovations, which environmental impacts have not been well understood yet. Therefore, this study assesses the environmental impacts of aeroponic farm container system in the UK, including a full set of 19 indicators. The results show that energy requirements drive all the impacts, with climate change estimated at 1.52 kg CO2eq. per 1 kg of microgreens (pea shoots) using 2021 UK grid. Renewable powered systems improve almost all the impacts, with climate change reduced by up to 80 %, making this system competitive with con-ventional agricultural systems. This study proves that aeroponic farm container could offer lower impact food than equivalent imported to the UK, and that also could improve food security in terms of availability, stability, and access to food. Affordability issues need to be assessed in future work. |
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WOS:000919332100001 |
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UAI @ alexi.delcanto @ |
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1726 |
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Wiener, M.; Moreno, S.; Jafvert, C.; Nies, L. |
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Time Series Analysis of Water Use and Indirect Reuse within a HUC-4 Basin (Wabash) over a Nine Year Period |
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2020 |
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Science of the Total Environment |
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Sci. Total Environ. |
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738 |
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140221 |
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0048-9697 |
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UAI @ eduardo.moreno @ |
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1170 |
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