Eucalyptus biochar removes wastewater pollutants

Researchers have developed a sustainable biochar from eucalyptus wood waste to effectively filter the pollutant benzo(ghi)perylene from vehicle-wash wastewater. Under controlled laboratory conditions, the biochar demonstrated a maximum removal efficiency of 98 percent.

The study highlights the importance of sustainable filtration methods for treating industrial wastewater, particularly chemical runoff. This biochar offers a potential low-cost solution for purifying water contaminated by polycyclic aromatic hydrocarbons.

The biochar was produced through pyrolysis under nitrogen and activated with 1 M HCl. Optimal performance was achieved at 60 °C and a pH of 6, using an adsorbent dosage of 0.8 g for a 120-minute contact time.

The material exhibits high durability, maintaining over 84 percent adsorption efficiency after six consecutive adsorption-desorption cycles. The adsorption process follows the pseudo-second-order kinetic model and the Langmuir isotherm model.

Published on 2026-10-14, these findings provide a sustainable alternative to conventional carbon adsorbents, challenging the reliance on fossil-fuel-based filtering agents. The use of agricultural waste in addressing complex hydrocarbon contamination is a significant advancement in environmental chemistry.

The potential commercialization of this biochar could reduce costs associated with industrial wastewater treatment and urban runoff management. If scaled successfully, it may decrease the presence of harmful hydrocarbons in local water systems and environmental basins.

Utilizing agricultural byproducts for water purification is part of a growing trend in sustainable waste management. Further research is needed to assess the long-term energy requirements and cost-effectiveness of this production method.

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