Inorganic Waste Management in Greenhouse Agriculture in Almeria (SE Spain): Towards a Circular System in Intensive Horticultural Production

The concept of circular economy, whose model is based on three main pillars: (i) design out waste and pollution; (ii) keep products and materials in use; and (iii) regenerate natural systems, has recently been applied to different sectors. This concept is directly related to bioeconomy. Spain implemented its own strategy in bioeconomy in 2016, affecting all economic activities, agriculture included. In line with this, one of the most important agricultural sectors is the greenhouse horticulture of Almeria (SE Spain). This region has experienced deep changes in the last 40 years, and has become one of the most efficient agro-industrial complexes in the world. This rapid growth has brought sustainability problems such as pollution, water overuse, or inadequate waste management. Several studies have undertaken organic waste reuse or minimization, but an important lack of knowledge exists regarding the inorganic fraction. One of the goals of the REINWASTE project is to find solutions for this problem. Therefore, an extensive legal framework has been consulted and an in-depth study of the steps in greenhouse production with the associated residues has been carried out. Additionally, information from experts and stakeholders has been registered, resulting a list of Best Available Technologies (BATs) to prevent and minimize inorganic waste generation. This article highlights the intensive greenhouse horticulture from Almeria efforts to reach circularity by closing the loop with inorganic waste.