Loading...
Publication
Reutilização de águas residuais urbanas tratadas em rega de uma cultura mediterrânica- implicações nas emissões de carbono
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 2.64 MB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
Este trabalho realizou-se em 2019 na ETAR Faro Noroeste, com o objetivo de se estudar a
possibilidade da reutilização do seu efluente tratado como origem alternativa para rega de uma
cultura de laranjas existente nas proximidades.
Este trabalho se enquadra como um estudo preliminar de um projeto para a determinação das
características iniciais da água residual tratada, da água subterrânea utilizada na rega de um
laranjal e do solo onde a cultura está situada.
Foram monitorizados os aspetos relativos à quantidade e qualidade do efluente tratado neste
período, e verificou-se o cumprimento dos requisitos para a sua utilização, de acordo com as
novas orientações legais para o espaço comunitário europeu.
Procedeu-se à caracterização da água subterrânea utilizada atualmente no sistema de rega do
laranjal assim como o solo da área produtiva, com objetivo de se determinar uma referência
inicial do sistema e de comparar com a água residual tratada.
Durante o período de realização deste trabalho, foram inventariados os consumos energéticos
associados à movimentação da água para rega, e comparados nos dois cenários, o da rega
tradicional do laranjal (com recurso a água subterrânea) e o da rega com efluente tratado. Com
base nos consumos energéticos dos dois cenários de rega (água subterrânea e reutilização do
efluente tratado) foram estimadas as Emissões de Carbono no sistema ETAR-Laranjal.
Foi possível identificar a aptidão da água residual tratada para a rega de laranjas, em termos
quantitativos e no que diz respeito aos parâmetros físico-químicos e microbiológicos.
Demonstrou-se que a utilização de água residual tratada permite reduzir: a de captação de água
subterrânea; os consumos energéticos suportados por melhor controlo de rega; as perdas por
evapotranspiração; e a necessidade em 21,5 % de fertilizantes de síntese azotados.
Associando a redução do volume de água para rega, com a redução da aplicação de fertilizantes
de síntese, constatou-se que a água residual urbana tratada pode funcionar como uma ferramenta
na descarbonização do sistema avaliado. Sendo pertinente o estudo da reutilização de água
residual tratada para outras situações, numa lógica de proximidade entre a sua disponibilidade
e a localização de outras culturas agrícolas.
This work was carried out in 2019 at the Faro Noroeste wastewater treatment plant (WWTP), with the objective of study the possibility of reusing its treated effluent as an alternative source for irrigation of a nearby orange crop. This work is part of a preliminary study of a project to determine the initial characteristics of treated wastewater, groundwater used for irrigating an orange grove and the soil where the crop is located. Aspects relating to the quantity and quality of treated effluent during this period were monitored and compliance with the requirements for its use was verified in accordance with the new legal guidelines for the European Community area. The groundwater currently used in the orangery irrigation system was characterized as well as the soil of the productive area, in order to determine an initial reference of the system and to compare it with the treated wastewater. During the period of this work, the energy consumptions associated with the movement of water for irrigation were inventoried and compared in the two scenarios, the traditional orange grove irrigation (using groundwater) and the treated effluent irrigation. Based on the energy consumptions of the two irrigation scenarios (groundwater and treated effluent reuse), the carbon emissions in the WWTP-Orange grove system were estimated. It was possible to identify the suitability of the wastewater treated for oranges irrigation, in quantitative and in of physicochemical and microbiological parameters terms. The use of treated wastewater has been shown to reduce: groundwater abstraction; energy consumptions supported by better irrigation control; evapotranspiration losses; and the need of 21.5 % nitrogen fertilizers. Combining the reduction of irrigation water volume with the reduction of the application of synthetic fertilizers, it was found that treated urban wastewater can act as a tool in the decarbonization of the evaluated system. Being relevant the study of the reuse of treated wastewater for other situations, in a logic of proximity between its availability and the location of other agricultural crops
This work was carried out in 2019 at the Faro Noroeste wastewater treatment plant (WWTP), with the objective of study the possibility of reusing its treated effluent as an alternative source for irrigation of a nearby orange crop. This work is part of a preliminary study of a project to determine the initial characteristics of treated wastewater, groundwater used for irrigating an orange grove and the soil where the crop is located. Aspects relating to the quantity and quality of treated effluent during this period were monitored and compliance with the requirements for its use was verified in accordance with the new legal guidelines for the European Community area. The groundwater currently used in the orangery irrigation system was characterized as well as the soil of the productive area, in order to determine an initial reference of the system and to compare it with the treated wastewater. During the period of this work, the energy consumptions associated with the movement of water for irrigation were inventoried and compared in the two scenarios, the traditional orange grove irrigation (using groundwater) and the treated effluent irrigation. Based on the energy consumptions of the two irrigation scenarios (groundwater and treated effluent reuse), the carbon emissions in the WWTP-Orange grove system were estimated. It was possible to identify the suitability of the wastewater treated for oranges irrigation, in quantitative and in of physicochemical and microbiological parameters terms. The use of treated wastewater has been shown to reduce: groundwater abstraction; energy consumptions supported by better irrigation control; evapotranspiration losses; and the need of 21.5 % nitrogen fertilizers. Combining the reduction of irrigation water volume with the reduction of the application of synthetic fertilizers, it was found that treated urban wastewater can act as a tool in the decarbonization of the evaluated system. Being relevant the study of the reuse of treated wastewater for other situations, in a logic of proximity between its availability and the location of other agricultural crops
Description
Keywords
Reutilização Águas residuais urbanas Agricultura Laranjal