Adsorption efficiency of biochar produced by aquaculture by-products for removing geosmin in aquaculture environment

Abstract

Aquaculture produces numerous by-products like aquatic plants, algae, and nutrient-enriched sediment annually, which are often discarded as waste, are not environmentally friendly, and are harmful to the environment. In this study, aquaculture by-products were utilized to prepare moss biochar at 500, 700, and 800 °C (BC500, BC700, and BC800, respectively); Elodea biochar (WBC800) at 800 °C; and sediment biochar (SBC800) at 800 °C. Characterization and experimental results showed that BC800 had the best adsorption effect on geosmin (GSM) under the same conditions; when using BC800 to treat GSM solution with a pH of 7, the adsorption efficiency of GSM was high (97.08%) under the conditions of dosage of 1.0 g, temperature of 25 °C, and adsorption time of 2 min. Adsorption is a multimolecular layer process that involves both physical aspects of porous adsorption and connections between chemical bonds. Biochar, derived from aquaculture by-products, is utilized to eliminate odorous substances in aquaculture environments, thereby promoting resource recycling. HIGHLIGHTS Aquaculture by-products address environmental issues in aquaculture.; The removal efficiency of BC800 for earth odorant in aqueous solution can reach 97.08%.; The adsorption process of BC800 on GSM is both physical and chemical adsorption of multimolecular layer adsorption.;

Keywords

• adsorption efficiency
• aquaculture by-product
• moss biochar
• removal of odorous substances