Ndaginimana, et al (2024) Synthesis and evaluation of a novel cross-linked 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/ferric chloride hybrid material for integrated coagulation and adsorption of turbidity and humic acid from synthetic wastewater: Implications for sludge valorisation. Environmental Research. https://doi.org/10.1016/j.envres.2024.119134

A team of researchers has synthesized an innovative biochar/ferric chloride (BC-FeCl3) hybrid material that offers significant advancements in wastewater treatment. Their study, detailed in Environmental Research, focuses on improving the removal of turbidity and humic acid (HA) from synthetic wastewater while addressing the challenge of sludge disposal.

Ferric chloride (FeCl3) is widely used in coagulation due to its effectiveness in removing turbidity. However, it struggles with dissolved pollutants like humic acid, a common organic contaminant. The research team, led by Pamphile Ndagijimana and colleagues, integrated biochar—a material known for its high adsorption capabilities—with ferric chloride to enhance pollutant removal efficiency.

The study highlights several key achievements:

1. Synthesis of BC-FeCl3 Hybrid: The novel coagulant combines biochar’s porous structure and functional groups with ferric chloride’s coagulation properties, overcoming FeCl3’s hygroscopic issues and optimizing coagulation dosage.
2. Efficient Pollutant Removal: The BC-FeCl3 hybrid effectively removes turbidity and humic acid within a 10-minute settling period at a near-neutral pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More of 7.5.
3. Sludge Valorisation: The study introduces a method to recover and recycle the produced sludge, utilizing it for further adsorption of humic acid. This not only mitigates iron contamination but also repurposes the sludge, adding value to the waste product.

This addresses multiple challenges in water treatment, presenting a sustainable and efficient solution for pollutant removal and sludge management. The integration of biochar with ferric chloride not only enhances water purification processes but also contributes to environmental sustainability by transforming waste into a valuable resource.