The Graz Lagrangian (GRAL) system is a Lagrangian particle model with a free Graphic User Interface (GUI) available in both Linux and Windows. The last beta was published last November and now the developers have released the version 20.01. The software is now open source under a GPL-3.0 license, so everybody is welcomed to contribute to the project. The source code, has been published in github.

    The Graz Lagrangian Model - GRAL - was initially developed in 1999, and has been used extensively in regulatory assessments and scientific studies. The initial driver for the development of GRAL was the need for a model that could deal with the frequent low-wind-speed conditions (< 1.5 m s^-1 for up to 90 per cent of the time) in the inner-Alpine basins of Austria. According to the developers, there are around 600 users worldwide using, the GRAL/GRAMM system.

   In the industrial production of olive oil, both solid wastes and those produced from their incineration are a serious environmental problem since only 20% w/w of the fruit becomes oil and the rest is waste, mainly orujo and alperujo. 

   A key aspect to transforming these wastes into an important source of energy such as pellets is to recognize the most appropriate time of the year for waste drying, with the objective of minimizing the environmental impact of the volatile compounds contained in the waste.

D. Hernández^1,2,3, H. Quinteros-Lama², C. Tenreiro² , D. Gabriel³

¹Instituto de Química de los Recursos Naturales, Universidad de Talca, Box 747, Talca, Chile
²Facultad de Ingeniería, Universidad de Talca. Merced 437, 3341717, Curicó, Chile
³GENOCOV Grupo de investigación. Departamento de Ingeniería Química, Biológica y Ambiental, Universidad autónoma de Barcelona, 08193, Bellaterra, España.