Solar distillation of olive mill wastewater

A solar still was employed for the dewatering of olive mill wastewater over a series of consecutive days. The collected distillate and the remaining pulp were analyzed to test the method for treating agro-food industry wastewater. The efficiency of solar distillation of olive mill wastewaters was examined. Due to reduced energy consumption and relatively high temperatures achieved in the still, solar distillation could be applied in any process where separation of liquid and solid phase is required. A quantity of olive mill wastewater was left inside the solar still for 9 days, under outdoor conditions. Critical quality parameters (e.g. chemical oxygen demand, pH, total and volatile solids, total Kjeldahl nitrogen) were determined by daily sampling of both the distillate and the basin liquid. In addition, solar radiation and liquid, glass and ambient temperatures were recorded. It was shown that the distillate produced was free from solids, 80% lower in terms of COD and 90% in terms of TKN, while the basin residual was in solid form with only 15% water concentration and without any odor emissions

Stratified Energy-Storage Vessels - Characterization of Performance and Modeling of Mixing Behavior

WOS: A1994NA99700003The performance of several solar energy storage vessels is extensively tested and recorded according to the CSTG procedure and their efficiencies in energy delivering is calculated. The stratification inside the vessels is determined by matching the profiles to predictions from a layers-in-series model. The model is extended to account for dead spaces inside the vessel and is proven to be useful in evaluating the performance of stratified solar energy storage vessels

Selecting an appropriate Multi-Criteria Decision Aid Technique for renewable energy planning

This article develops a methodological framework to provide insights regarding the suitability of multi-criteria techniques in the context of renewable energy planning. The second section presents main characteristics of the particular decision-making process. The third section presents the main multi-criteria analysis methods, and the fourth section reveals the requirements of the techniques for renewable energy planning and the main attributes under which these methods should be evaluated. Subsequently, in the fifth section, a comparative matrix is created with the various appropriate multi-criteria techniques and their performance. Finally in the sixth sec tion, we present our conclusions