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Modelling the integrated management of organic waste at a territory scale

Soulie J.C., Wassenaar T.. 2017. In : Syme G. (ed.), Hatton MacDonald D. (ed.), Fulton B. (ed.), Piantadosi J. (ed.). MODSIM2017 Managing cumulative risks through model-based processes. Abstracts. Hobart : Modelling and Simulation Society of Australia and New Zealand, p. 75. International Congress on Modelling and Simulation (MODSIM2017). 22, 2017-12-03/2017-12-08, Hobart (Australie).

Modelling integrated management of organic waste at a farm level is still a key challenge, but one can find several works in the literature. However, the shift to a larger (e.g area, district or county) scale is even more complex. Consequently, associated modelling work is still considerably under-developed. Here we use the UPUTUC model (french acronym of Production Unit, Transformation Unit, Consumption Unit) to examine fluxes of organic matter residues within the Territoire de la Côte Ouest (TCO), on the west of Réunion Island. UPUTUC is an agent-based model and is developed using the AnyLogic platform. This platform is a multi- method modeling environment and allows for the combination of discrete event models, agent-based models and system dynamics models. It also provides spatial features in order to use information coming from GIS. UPUTUC uses three agents. These agents are: (i) production units that produces organic matter or waste (for example: pork, poultry breeding and sludge produced by a wastewater treatment plant), (ii) transformation units that produces compost or fertilizer with organic matter coming from the production unit, and (iii) consumption units that uses transformed organic matter from the transformation unit or organic matter coming directly from the production unit (for example: a sugar cane field, a market gardening and a grassland). State variables of production units are a production rate, a stock, and all times and distances to the transformation units and consumption units in the model. State variables of transformation units are a production rate, equations the transform organic matter into compost or fertilizer, a transformation time, a stock, capacity of trucks that delivers products to consumption units, and finally, all times and distances to consumption units in the model. State variables of consumption units are an area, compatible fertilizers with the unit, fertilizer requirements, and periods during which fertilization is poss

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