Utilizing orange peel waste biomass in textile wastewater treatment and its recyclability for dual biogas and biochar production: a techno-economic sustainable approach

Abstract Orange peel is a fruit-based biomass produced in huge quantities worldwide, requiring an appropriate management strategy to meet the waste-to-wealth approach. In current study, this agricultural waste was used (as adsorbent) treat dye-laden wastewater, followed by its regeneration and recyclability for dual biogas biochar production. An adsorbent material prepared mixing orange powder (OPP) with (1:1, w/w) remove various pollutants from textile wastewater (TWW) within 30 min. This adsorption system achieved chemical oxygen demand (COD), total dissolved solids (TDS), turbidity, color removal efficiencies of 38.56±1.73%, 29.31±1.25%, 91.92±4.75%, 74.81±3.96%, respectively. The spent cleaned mixed cow dung inoculum) generate via anaerobic co-digestion. maintained bio-CH 4 411.5±21.7 mL/g volatile (VS), equivalent 14.3±1.1% COD initial . Because digestate co-digestion process contained suspended (VSS), VSS/COD percentage 45.2±3.2%, it efficiently pyrolyzed obtain biochar. adsorption/co-digestion/pyrolysis combined revealed financially feasible scenario, payback period 7.5 years. study outputs would fulfill sustainable development goals (SDGs) related minimization, environmental protection, affordable energy supply. Graphical abstract