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<p>This study evaluates the treatment efficiency of a laboratory-scale upflow anaerobic sludge blanket (UASB) reactor integrated with polymeric filter media (PFM) for nutrient removal from low-strength synthetic wastewater. The influent, formulated with sucrose and micronutrients, had a COD of 220 ± 30.6&#xa0;mg/L. Operated at ambient temperature (27 ± 5&#xa0;°C) and seeded with acclimatized sludge, the reactor attained steady-state in 100&#xa0;days during a 758-day operational period. At a flow rate of 500&#xa0;mL/h, the system maintained a hydraulic retention time (HRT) of 6.5&#xa0;h and achieved an organic loading rate of 0.734 ± 0.164&#xa0;kg COD/m<sup>3</sup>/day. COD removal efficiency averaged 85.54 ± 6.53%, while biogas production yielded 75 ± 10.25% methane. Biomass retention and methanogenic activity were enhanced by <i>Sapindus trifoliatus</i> extract. For post-treatment, chitosan-agarose cryogel-based PFM was employed, offering a biodegradable, porous medium for adsorption. Fixed bed column studies were conducted at flow rates from 100 to 500&#xa0;mL/h and bed heights up to 20&#xa0;cm. The optimal nutrient removal occurred at a 100&#xa0;mL/h flow rate and 20-cm bed height, with first-hour removal efficiencies of 87 ± 5.5% for total phosphorus (TP), 75 ± 3.5% for total Kjeldahl nitrogen (TKN), and 91.5 ± 1.5% for COD. Kinetic analysis showed that both the Thomas and Yoon–Nelson models fit well (<i>R</i><sup>2</sup> &gt; 0.90), confirming effective adsorption dynamics.</p>

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Evaluating UASB Reactor Performance with Polymeric Filter Media in Removing Nutrients from Synthetic Wastewater

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Ashish Tiwari,
  • Anurag Tiwari,
  • Santosh Kumar,
  • A. R. Quaff,
  • R. P. Tiwari

摘要

This study evaluates the treatment efficiency of a laboratory-scale upflow anaerobic sludge blanket (UASB) reactor integrated with polymeric filter media (PFM) for nutrient removal from low-strength synthetic wastewater. The influent, formulated with sucrose and micronutrients, had a COD of 220 ± 30.6 mg/L. Operated at ambient temperature (27 ± 5 °C) and seeded with acclimatized sludge, the reactor attained steady-state in 100 days during a 758-day operational period. At a flow rate of 500 mL/h, the system maintained a hydraulic retention time (HRT) of 6.5 h and achieved an organic loading rate of 0.734 ± 0.164 kg COD/m3/day. COD removal efficiency averaged 85.54 ± 6.53%, while biogas production yielded 75 ± 10.25% methane. Biomass retention and methanogenic activity were enhanced by Sapindus trifoliatus extract. For post-treatment, chitosan-agarose cryogel-based PFM was employed, offering a biodegradable, porous medium for adsorption. Fixed bed column studies were conducted at flow rates from 100 to 500 mL/h and bed heights up to 20 cm. The optimal nutrient removal occurred at a 100 mL/h flow rate and 20-cm bed height, with first-hour removal efficiencies of 87 ± 5.5% for total phosphorus (TP), 75 ± 3.5% for total Kjeldahl nitrogen (TKN), and 91.5 ± 1.5% for COD. Kinetic analysis showed that both the Thomas and Yoon–Nelson models fit well (R2 > 0.90), confirming effective adsorption dynamics.