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Advances in vermifiltration: A comprehensive review of recent developments and applications
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This review of vermifiltration advances from 2018-2024 found that earthworm-microbe systems achieve median removal of 90% for BOD, 81% for COD, and over 99% for fecal coliforms from wastewater. Hybrid configurations with biochar and constructed wetlands further improve performance, though challenges remain with filter clogging, temperature sensitivity, and scaling to address emerging contaminants like microplastics.
• Vermifiltration enhances pollutant removal using earthworm-microbial interactions • Recent advances integrate vermifiltration with wetlands and biochar filtration • Optimized loading rates improve system stability and treatment efficiency • Future research targets antibiotic resistance, microplastics, and greenhouse gases Vermifiltration is an emerging, nature-based technology that relies on synergistic interactions between earthworms and microbes to remove organic matter, nutrients, and contaminants from wastewater. This review synthesizes recent advances from 2018 to 2024, highlighting innovations in system design, process optimization, and hybrid integrations that enhance its performance and applicability. Across various wastewater categories, including municipal, industrial, and agricultural effluents, vermifilters demonstrate high treatment efficacy. A meta-analysis of 14 studies reveals median removal efficiencies of 89.8% for biochemical oxygen demand (BOD) and 81% for chemical oxygen demand (COD), with typical removal ranging from 70–95% and 65–90%, respectively, and over 99% for fecal coliforms. This review critically evaluates key operational parameters such as hydraulic loading rates, earthworm stocking densities, and filter media composition to discern performance trends. Furthermore, innovations like the integration of biochar-enhanced media and hybrid configurations with constructed wetlands improve system resilience and pollutant removal. Key co-benefits include minimal sludge generation, recovery of nutrient-rich vermicast for soil application, and significant mitigation of greenhouse gases like methane (CH₄) and nitrous oxide (N₂O), alongside effective odor control. Despite these promising outcomes, challenges persist, including filter bed clogging, temperature sensitivity, and a lack of standardized protocols, which constrain scalability and regulatory acceptance. Future research should prioritize system automation, long-term field trials targeting emerging contaminants, and the development of clear policy frameworks. Overall, vermifiltration presents a reliable, low-energy, and climate-friendly approach to advancing sustainable, decentralized wastewater management.
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Enhancing domestic wastewater treatment: Integrating vermifiltration and biochar for heavy metal and microplastic reduction and by-product utilization
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Researchers tested a wastewater treatment system combining earthworms and biochar — a carbon-rich material made by burning organic matter — and found it removed up to 88.6% of microplastics and nearly 100% of several heavy metals from domestic wastewater. The system also produced nutrient-rich organic matter as a byproduct, offering a low-cost, eco-friendly solution for water treatment and soil improvement.
Evaluation of vermifilter-treated domestic wastewater for irrigation and fertigation: opportunities and challenges for implementation
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Researchers evaluated whether wastewater treated through vermifiltration could be safely reused for agricultural irrigation. They found that while the system effectively removed most organic micropollutants with 91% average efficiency, the effluent still required additional disinfection and treatment to meet irrigation safety standards, particularly for E. coli levels. The study also detected microplastics in the treated effluent, highlighting the need for further post-treatment steps before agricultural reuse.
Enhancing microplastic removal and nitrogen mitigation in constructed wetlands: An earthworm-centric perspective
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Researchers added earthworms to constructed wetlands and found they significantly improved the removal of biodegradable microplastics and nitrogen pollutants from wastewater. The earthworms reshaped their gut microbial communities in ways that boosted both plastic degradation and nitrogen cycling, increasing microplastic removal by 13.5 percent. The findings suggest that incorporating earthworms into wetland treatment systems could offer a natural, low-cost approach to improving water quality.
The Possibility of Microplastic Removal by Earthworms and Comparing With Conventional Chemical Removal Methods (A Global and Deeply Systematic Review)
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Researchers reviewed chemical and biological strategies for microplastic removal, finding that certain earthworm species can absorb and decompose microplastic particles within weeks, offering a potentially low-cost biological alternative to conventional chemical removal methods.
Recent advancement in microplastic removal process from wastewater - A critical review
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This review of over 250 studies examines physical, chemical, and biological methods for removing microplastics from wastewater, finding that biochar filtration is among the most effective approaches. Effective removal of microplastics from water is important because these particles can accumulate in the food chain and pose risks to human health.
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