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Brewery Spent Grain (BSG) is a fibrous residue composed mainly of cellulose, hemicellulose, and lignin. It is rich in proteins, fermentable sugars, and bioactive compounds. These characteristics make BSG an essential feedstock for obtaining different products with high added value. Although it is widely used for animal feed, its use as a commodity for other applications has aroused interest. In this sense, this review article aims to provide an updated overview of the main uses and potential applications of BSG, from a critical perspective. For that, research articles were selected according to pre-established criteria using ScienceDirect and Scopus databases. The bibliographic research showed that BSG is rich in protein and amino acids, which make it attractive to animal feed. BSG has been employed to biogas production due to its energy value. The chemicals element presence, such as carbon, nitrogen, and phosphorus show that the BSG is a nutrient font to plant and microorganism used in several bioprocesses. Also, BSG is a lignocellulosic material that makes it attractive to produce biochar used in soil remediation, as adsorbent, and biocatalyst. Besides of these uses, its potential for application in biorefinery especially to bioproducts obtention, such as enzyme, biopolymers, biocides, and biofuel have been highlighted. It was evident that BSG has been used for several industrial applications. However, studies of operational conditions, cost, and energy efficiency assessments, product performance studies, among many others, are still necessary for the consolidation of BSG as a feedstock. [Display omitted] • The protein, fiber, and amino acids content in BSG makes it attractive to animal feed. • BSG has been used to anaerobic digestion due to its energy value. • BSG can be used to cationic and anionic species adsorption, especially metals and dyes. • The BSG is nutrient font to plants and microorganisms due to N, P and C content. • BSG has been employed to bioproducts obtention, such as enzyme and biofuel. [ABSTRACT FROM AUTHOR]

• Biochars were produced from malt bagasse by activation with CO 2 and ZnCl 2. • The materials were used to treat effluents containing 2-chlorophenol. • Biochars presented surface areas of 161 m² g−1 (CO 2) and 545 m² g−1 (ZnCl 2). • ZnCl 2 -biochar exhibited an efficiency of 98 % in the treatment of effluents. The application of adsorption using biochars for the remediation of effluents containing emerging contaminants, including chlorophenols, is a hotspot and trend development in the literature. This treatment is more interesting when using readily available wastes and at no cost, such as malt bagasse, for example. Here, the biochars were produced from malt bagasse, by physical and chemical activation (with CO 2 and ZnCl 2 , respectively) and employed as adsorbents in the remediation of effluents containing 2-chlorophenol. Results revealed that the activated biochars have mesoporous structures and surface areas of 161 m² g−1 (CO 2) and 545 m² g−1 (ZnCl 2). For both activated biochars, adsorption of 2-chlorophenol was favored under acid conditions, with the highest adsorption capacities found using ZnCl 2 -activated biochar. The maximum adsorption capacity using ZnCl 2 -activated biochar was 150 mg g−1. The process was endothermic and spontaneous. ZnCl 2 -activated biochar exhibited an efficiency of 98 % (using a dosage of 10 g L−1) in the treatment of industrial effluents containing 2-chlorophenol. [ABSTRACT FROM AUTHOR]