Techno-economic feasibility of biochar as biosorbent for basic dye sequestration

Biochar has a global scientific attention for its ability to remove toxic elements from wastewaters. However, due to the disparity between practical short-term agronomic benefits and aspirations of biochar as an everlasting sustainable bio sorbent for the adsorption process, economic assessments of biochar have yet to be established. In this context, the current study, an economic approach of the biochars derived from agricultural wastes (Coconut shell, Groundnut Shell and Rice husk) for the removal of Basic Red 09 from wastewaters were demonstrated. Batch adsorption experimental set up was used to carry out the adsorption process. At equilibrium batch adsorption conditions, the maximum adsorption capacity of the biochars were 10, 46.3, and 44 ​mg/g for coconut shell, groundnut shell, and rice husk based biochars, respectively. A complete cost assessment was carried out for the agro-waste biochars for their adsorption performance. The biochars derived from groundnut shell and rice husk were shown to be the most cost effective for the Basic Red 09 sequestration from wastewater. The eco-friendly characteristics of these low-cost adsorbents for industrial applications were also discussed.