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13 results on '"Duarte E"'

2. Challenges for modern wine production in dry areas: dedicated indicators to preview wastewater flows.

Author

Oliveira, M., Costa, J. M., Fragoso, R., and Duarte, E.

Subjects
WINE making, SEWAGE, WATER consumption, WASTEWATER treatment
Abstract

Wine production is an important socio-economic activity in Mediterranean countries. This study is focused on wine production under warm and dry climate conditions in south Portugal, in two major wine-producing regions (Tejo and Alentejo), characterized by small to medium sized wineries. Vineyards have been expand ing in this region of Portugal, where about 50-70% of the vineyards are irrigated, increasing regional water demand. The aim of this study is to propose an integrative approach for wine production, where a simple calculation model has been developed and validated to preview water consumption and wastewater production, as functions of winemaking periods and type of processed grapes. Results revealed a global ratio of 2.2 ±0.45 and 2.1 ±0.17 Lwater/Lwine. Concerning dedicated indicators, 60-75% of the wastewater was produced during Period I and the red wine production represented a 50-64% increase in water consumption. This tool will enable winemakers to calculate Global and Dedicated Indicators, based on their own parameters, which provide information on flow volumes and peak flows. In this context, it will be possible to identify improvements for wastewater treatment and management towards water reuse as a promising solution for the wine sector in the framework of the circular economy. [ABSTRACT FROM AUTHOR]

Published
2019
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4. Valuation of OSA process and folic acid addition as excess sludge minimization alternatives applied in the activated sludge process.

Author

Martins, C. L., Velho, V. F., Ramos, S. R. A., Pires, A. S. C. D., Duarte, E. C. N. F. A., and Costa, R. H. R.

Subjects
SLUDGE management, FOLIC acid, CHEMICAL oxygen demand, WATER purification, WATER pollution
Abstract

The aim of this study was to investigate the ability of the oxic-settling-anaerobic (OSA)-process and the folic acid addition applied in the activated sludge process to reduce the excess sludge production. The study was monitored during two distinct periods: activated sludge system with OSAprocess, and activated sludge system with folic acid addition. The observed sludge yields (Yobs) were 0.30 and 0.08 kg TSS kg-1 chemical oxygen demand (COD), control phase and OSA-process (period 1); 0.33 and 0.18 kg TSS kg-1 COD, control phase and folic acid addition (period 2). The Yobs decreased by 73 and 45% in phases with the OSA-process and folic acid addition, respectively, compared with the control phases. The sludge minimization alternatives result in a decrease in excess sludge production, without negatively affecting the performance of the effluent treatment. [ABSTRACT FROM AUTHOR]

Published
2016
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13. Reuse of treated wastewater and sewage sludge for fertilization and irrigation.

Author

Sousa G, Fangueiro D, Duarte E, and Vasconcelos E

Subjects
Nitrogen analysis, Poaceae chemistry, Soil, Agricultural Irrigation, Fertilization, Sewage
Abstract

The objective of the present work was to assess the short-term potential of treated wastewater and sewage sludge for ornamental lawn fertilization and irrigation. A field experiment was performed and the following treatments were considered: sewage sludge application + irrigation with public water; sewage sludge application + irrigation with treated wastewater; irrigation with public water; irrigation with treated wastewater (TW). Irrigation with treated wastewater showed a positive effect on lawn installation through higher growth of grass (1,667 cm) and higher dry matter yield (18,147 g m(-2)). These results represent a significant increase in the grass yield compared with public water irrigation. The grass height (2,606 cm) and dry matter yield (23,177 g m(-2)) increased even more, when sewage sludge produced in the wastewater treatment plant (WWTP) was applied to soil, which proves once more its benefits as an organic fertilizer. At the end of the experiment, an increase of some soil parameters (pH, electrical conductivity, organic matter, Ca2+, Na+, K+, Mg2+ and NH4+) was observed, indicating that treated wastewater irrigation can cause a soil sodization. This short-term study indicated that use of treated wastewater and sewage sludge for ornamental lawn fertilization and irrigation is an environmentally sustainable option for re-use of the WWTP by-products.

Published
2011
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