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Evaluation of Energy Production Through Solar Photovoltaic Technology for Self-Consumption in the Parish Council of São Bartolomeu de Messines, Portugal – Preliminary Study

Pardal Ana, Pinto José, Fernandes Joana

Journal of Ecological Engineering

2019

Vol. 20, nr 5

111--120

Human survival depends on the continuous supply of energy the demand of which has been steadily increasing. Sharp rises in fuel prices have had major repercussions on the economies of the countries with the greatest energy dependence, and make it imperative to change the attitudes and practices in business and social circles. Today, the problem involves meeting energy needs without negatively affecting the environment, as well as ensuring the wellbeing of current and future generations (sustainable development). The promotion of alternative energy is one of the priorities of the energy and environmental policy of European Union, since it is a decisive factor in reducing greenhouse gases, thus enabling compliance with the Paris agreement. In this work, the contribution of the photovoltaic systems installed for self-consumption in the headquarters of the parish council of São Bartolomeu de Messines, Algarve, Portugal, was assessed. The results indicate that a system with an installed capacity of 6 kW, requiring an investment around 10 000 €, could achieve its economic pay-back in 6.7 years, contributing to a reduction of the annual electricity bill in the building by 60%.

Electrochemical treatment of olive mill waste powered by photovoltaic solar energy

Marmanis D., Dermentzis K., Christoforidis A., Diamantis V., Ouzounis K., Agapiou A., Stylianou M.

Journal of Power Technologies

2018

Vol. 98, nr 5

377--381

The proposed photovoltaic electrochemical (PV-EC) process combines autonomous and environmentally friendly photovoltaic solar energy with the capability of the combined electrocoagulation/electrooxidation process to effectively remediate toxic olive mill wastewaters and simultaneously produce electrolytic hydrogen. The photovoltaic array can be connected directly to an electrochemical reactor without batteries increasing, in this way, system sustainability and eliminating the environmental threat of poor battery disposal management. The PV-EC system is proved versatile according to the instantaneous solar irradiation by adjusting the wastewater flow rate to the current intensity supplied by the photovoltaic array. Operating parameters affecting the efficiency of the proposed process, such as wastewater flow rate, conductivity, current density, electroprocessing time and solar irradiance were studied and optimal conditions were investigated. The experimental results showed that the initial COD of 21000 mg/dm3 and turbidity of 162 NTU of the olive mill waste sample, were effectively reduced to 122 mg/dm3 and 0 NTU, respectively, after treating the wastewater by both, batch wise and continuously operated electrocoagulation and electrooxidation or combination of the two processes. The proposed process is a safe method for effective treatment of toxic and recalcitrant wastes, such as oily olive mill wastewaters, especially for applications in remote and isolated locations with lack of electric grid.