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<p>This study examines the photocatalytic decolourisation and degradation of untreated leachate using an MWCNT/TiO<sub>2</sub> nanocomposite under varying reactor designs and operating conditions. Experiments were conducted under two visible lamps and one UV lamp for 4.5&#xa0;h, with a catalyst dosage of 0.15&#xa0;g at pH 4. The performance was assessed in three reactors: trapezoidal (R1), cylindrical (R2), and tubular (R3). R1 demonstrated the highest degradation (86%) and decolourisation (95%) efficiencies, followed by R3 (73% and 80%) and R2 (65% and 73%). Reusability tests indicated stability up to six cycles, though colour and COD removal efficiencies declined from 93% to 35% and 86% to 20%, respectively. The findings highlight the impact of reactor design, lamp intensity, and catalyst reusability on treatment efficiency. This study supports SDG 6 (Clean Water and Sanitation) and SDG 7 (Affordable and Clean Energy) by promoting a sustainable wastewater treatment approach. The proposed method leverages renewable solar energy, particularly beneficial in sun-rich regions like India. Enhancing UV-visible lamp intensity could further improve treatment efficiency, paving the way for pilot-scale studies and real-world applications.</p> Graphical abstract <p></p>

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Evaluation of landfill leachate treatment using Multi-Walled Carbon NanoTube (MWCNT) doped Titanium Dioxide (TiO2) composites in three types of reactor

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • N. Thangam,
  • S. Suriya

摘要

This study examines the photocatalytic decolourisation and degradation of untreated leachate using an MWCNT/TiO2 nanocomposite under varying reactor designs and operating conditions. Experiments were conducted under two visible lamps and one UV lamp for 4.5 h, with a catalyst dosage of 0.15 g at pH 4. The performance was assessed in three reactors: trapezoidal (R1), cylindrical (R2), and tubular (R3). R1 demonstrated the highest degradation (86%) and decolourisation (95%) efficiencies, followed by R3 (73% and 80%) and R2 (65% and 73%). Reusability tests indicated stability up to six cycles, though colour and COD removal efficiencies declined from 93% to 35% and 86% to 20%, respectively. The findings highlight the impact of reactor design, lamp intensity, and catalyst reusability on treatment efficiency. This study supports SDG 6 (Clean Water and Sanitation) and SDG 7 (Affordable and Clean Energy) by promoting a sustainable wastewater treatment approach. The proposed method leverages renewable solar energy, particularly beneficial in sun-rich regions like India. Enhancing UV-visible lamp intensity could further improve treatment efficiency, paving the way for pilot-scale studies and real-world applications.

Graphical abstract