Efficient Removal of Pollutants Using Sludge-Based Biochar in Wastewater Treatment

A novel method using pyrolysis and acid treatment produced highly porous sludge-based biochar, ASMS91, which effectively removes pollutants from agrochemical and pharmaceutical wastewater. It outperforms commercial activated carbon, demonstrating high adsorption capacity, recyclability, and cost-effectiveness for sustainable wastewater treatment and sludge valorization.

August 28, 2024

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Mian, et al (2024) Preparation of low-cost sludge-based highly porous biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More for efficient removal of refractory pollutants from agrochemical and pharmaceutical wastewater. *Journal of Hazardous Materials.* https://doi.org/10.1016/j.jhazmat.2024.135572

A recent study published in the Journal of Hazardous Materials explores a novel method to produce low-cost, highly porous biochar from a mixture of agrochemical-pharmaceutical and municipal sludge. The research addresses the challenge of developing a feasible and efficient biochar for wastewater treatment, particularly for agrochemical and pharmaceutical industries.

The team developed a method that combines pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More, acid treatment, and post-pyrolysis, resulting in a biochar named ASMS91. This biochar exhibited superior performance in removing chemical oxygen demand (COD) from wastewater compared to commercial activated carbonActivated carbon is a form of carbon that has been processed to create a vast network of tiny pores, increasing its surface area significantly. This extensive surface area makes activated carbon exceptionally effective at trapping and holding impurities, like a molecular sponge. It is commonly More. ASMS91 achieved a pore volume of 0.894 cm³/g and a surface area of 691.4 m²/g, which significantly enhanced its adsorption capabilities. In trials, it removed 45.3% of COD from wastewater within 24 hours.

Additionally, ASMS91 was highly effective in adsorbing long-chain aliphatic compounds, such as 2,4-Di-tert-butylphenol, and demonstrated excellent recyclability, maintaining performance after multiple uses. The biochar also outperformed existing sludge biochars in removing pollutants like perfluorooctanoic acid (PFOA), pharmaceuticals, and dyes.

This study highlights the potential for sludge valorization in wastewater treatment, offering a cost-effective alternative to conventional methods. The proposed technique presents an opportunity for sustainable management of hazardous sludge while addressing environmental pollution. Future research could further optimize this approach for broader industrial applications.