USE OF CONSTRUCTION AND DEMOLITION WASTE AS LOW COST ADSORBENTS FOR THE REMOVAL OF ACID BLUE113 FROM AQUEOUS SOLUTION Brahim Arhoun, Maria Villen-Guzman, Maria del Mar Cerrillo-Gonzalez, Carlos Vereda- Alonso, Cesar Gomez-Lahoz, Jose M. Rodriguez-Maroto Department of Chemical Engineering, Faculty of Sciences, University of Malaga, 29071, Malaga, Spain ABSTRACT: Construction and demolition waste (C&DW) is available in abundance, which can be used in textile wastewater treatment. The present study was undertaken to evaluate the adsorption capacity of C&DW for the removal of AB113 from aqueous solution. The effect of contact time, pH, dosage of adsorbent and temperature was studied to determine the optimum experimental condition to increase the capacity of adsorption. The maximum adsorption capacity was obtained at optimum conditions (natural pH, S/L = 20 g L −1 , 20 °C). Keywords: adsorption; Construction and demolition waste; textile wastewater treatment; thermodynamic. 1. INTRODUCTION Construction and demolition waste (C&DW) is characterized by its high volume and weight, although its environmental impact is low when compared to other waste because most of the fractions are inert. The environmental impacts associated with a high amount of C&DW are mainly derived from its transport and occupation of large areas in landfill and natural resource depletion. The C&DW measured in volume, represents the largest waste stream in the EU and represents approximately one third of all waste produced, which is approximately 820 million tonnes every year produced (Gálvez-Martos et al., 2018) and without adequate management (López Ruiz et al., 2020). Therefore, C&DW management is an important focus of current European policies and in the circular economy package (Gálvez-Martos et al., 2018; López Ruiz et al., 2020; Sormunen & Kärki, 2019). In order to achieve the goals of EU, some practical management of C&DW was implanted. C&DW was used in different practices in geotechnical applications such as filler material for construction of roads and embankments (Vieira & Pereira, 2015). The proposed research is aimed to purpose other application of C&DW at wastewater treatment. Adsorption has been proposed as an excellent alternative for wastewater treatment, which offers significant advantages, including its low economic cost, availability, profitability and ease of operation (Uddin, 2017). At present, multiple types of adsorbents are used, such as natural and industrial geo materials, waste materials from industry, agricultural by-products and active carbon to remove contaminants in wastewater (Yagub et al., 2014). All this entails the research of the efficient use of construction and demolition waste as a low cost adsorbent to replace the conventional adsorbents. This study will address the application of C&DW as an adsorbent of dyes from textile industry wastewater such as acid blue 113. For this, batch experiments were conducted to study the influence of various influential adsorption parameters of dye such as contact time, solution pH, adsorbent dosage, and temperature.