Facultad Regional Concordia

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Author: search.filters.author.Larocca, FedericoSubject: search.filters.subject.Reuse

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    Wastewater reuse on eucalyptus plantations in Colonia Ayuí, Argentina: effects on soils and productivity
    (2018-06-11) Tesón, Natalia; Larocca, Federico; Millán, Guillermo; Dalla Tea, Fernando; Larocca, Federico; Tesón, Natalia; Millán, Guillermo; Dalla Tea, Fernando
    The treatment of urban sewage with stabilization ponds is a common method used in medium size and small communities of the Entre Ríos province, in Argentina. This methodology has many advantages, such as the low cost of maintenance, easy to manage and has low energy demand. However, the discharge of the effluent of this plants to a water course can produce eutrophication as a result of its high level of nutrients. Reuse of this wastewater for irrigation is an excellent alternative to maintain the quality of the streams and to generate a sustained addition of nutrient and water for the plants. The results of this study correspond to a project led by INTA and Universidad Tecnológica Nacional with the collaboration of Municipio of Colonia Ayuí, Masisa and the ONG Salto Grande Ambiental. The community of Colonia Ayuí is located in the northeast of Entre Ríos, in the perimeter of the Salto Grande hidroelectrical plant, has 3000 residents and its urban effluents were discharged to the Salto Grande lake after its secondary treatment. The main objectives of this project are to reduce the addition of N and P to the reservoir and to evaluate the effect of the wastewater on the growth of an Eucalyptus grandis plantation. In January 2016, the irrigation of the 12 ha plot was started with a drip irrigation system. Total height and diameter at breast height were measured every 3 months on irrigated and non-irrigated plots and soil samples were taken annually to estimate electrical conductivity (EC) and sodium adsorption ratio (SAR). Total wastewater reuse was 84.78 Ml by the end of 2017 and irrigated plots increased their growth by 35% . Some changes in EC and SAR were detected but they didn’t affect the trees. Soil and water monitoring will be continued but this preliminar results indicate that the reuse of wastewater for irrigation is an excellent alternative to the direct discharge.
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    Quantifying the grey footprint as mitigated by the reuse of wastewater for eucalyptus grandis irrigation
    (2018-06-11) Larocca, Federico; Tesón, Natalia; Dalla Tea, Fernando
    The grey water footprint indicator (WFgy) is a method to quantify water pollution associated with the production of all goods and services for the individual or the community. Colonia Ayuí is a small community of 3000 residents located in the northeast of Argentina on the border to the Uruguay Republic. The Uruguay river, which divides the two countries, was used -about 4 decades ago- to build an hydroelectric dam that generated a large reservoir called Salto Grande Lake. The secondary treated wastewater of the communities like Colonia Ayui which lies next to the lake has been discharged for years into the Salto Grande lake producing ecological problems such as Eutrophication which in turn has other consequences on health, recreational use of the lake waters and tourism among others. Furthermore, other populated cities like Concordia (almost 170.000 inhabitants) take the water from the river 12 km downstream the dam and the toxins generated by the cyanobacteria of eutrophication, among others, remain in the water. In January of 2016, the wastewater from Colonia Ayuí began to be reused for the irrigation of an Eucalyptus grandis plantation by a drip irrigation system. The objective of this study is to quantify the grey footprint mitigation as related to N and P contents and the effect of the reuse and irrigation on tree growth. The WFgy was estimated as the pollutant load (in mass/time) divided by the difference between the ambient water quality standard for that pollutant in the receiving water body (the maximum acceptable concentration, in mass per volume) and its natural concentration (in mass/volume). At the same time, the parameters of soil and groundwater were monitored. In the 2nd year since the beginning of the project and the suspension of the overturn to the lake, there have been reused 54.178 m3 of wastewater that accounts for a Water Grey Footprint of 16.171.814 m3.