article · Biomass Conversion and Biorefinery
Orange peel waste mixed with biochar in an equal ratio creates an effective adsorbent for treating textile wastewater. When applied to dye-laden effluent, the material removes over ninety-one per cent of turbidity, nearly seventy-five per cent of colour, thirty-eight per cent of chemical oxygen demand, and twenty-nine per cent of total dissolved solids in thirty minutes. After wastewater treatment, the spent adsorbent can be washed and co-digested with cow dung to produce biogas, generating substantial biomethane from volatile solids. The remaining solid digestate from the co-digestion process is subsequently pyrolysed to produce biochar, closing the materials cycle. An evaluation of the integrated adsorption, co-digestion, and pyrolysis process indicates a financially viable circular system capable of achieving a payback period of seven and a half years while addressing agricultural and industrial waste streams.
Textile manufacturing produces heavily contaminated wastewater, while agricultural processing generates vast amounts of fruit waste. Converting discarded orange peels into an industrial water treatment agent and subsequently recovering renewable energy and biochar offers a circular approach to industrial pollution. This integrated method simultaneously addresses waste management, effluent treatment, and sustainable energy production.
This process offers textile manufacturers and wastewater treatment facilities a circular method to decontaminate effluent while generating biogas energy and biochar. A techno-economic assessment indicates financial feasibility with a 7.5-year payback period. As the process has been applied and tested on textile wastewater in experimental conditions, it represents an applied concept that requires pilot-scale validation before real-world adoption.
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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 the current study, this agricultural waste was used (as an adsorbent) to treat dye-laden wastewater, followed by its regeneration and recyclability for dual biogas and biochar production. An adsorbent material was prepared by mixing orange peel powder (OPP) with biochar (1:1, w/w) and used to remove various pollutants from textile wastewater (TWW) within 30 min. This adsorption system achieved chemical oxygen demand (COD), total dissolved solids (TDS), turbidity, and color removal efficiencies of 38.56±1.73%, 29.31±1.25%, 91.92±4.75%, and 74.81±3.96%, respectively. The spent adsorbent was cleaned and mixed with cow dung (as inoculum) to generate biogas via anaerobic co-digestion. This system maintained a bio-CH 4 of 411.5±21.7 mL/g volatile solids (VS), equivalent to 14.3±1.1% of COD initial . Because the digestate of the co-digestion process contained volatile suspended solids (VSS), with a VSS/COD initial percentage of 45.2±3.2%, it was efficiently pyrolyzed to obtain biochar. The adsorption/co-digestion/pyrolysis combined system revealed a financially feasible scenario, with a payback period of 7.5 years. The study outputs would fulfill various sustainable development goals (SDGs) related to waste minimization, environmental protection, and affordable energy supply. Graphical abstract
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DOI: 10.1007/s13399-023-04111-1
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