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Glass Wool Filters for Concentrating Waterborne Viruses and Agricultural Zoonotic Pathogens
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A comparative study for pathogen removal using different filter media during vermifiltration.

Sudipti Arora1, Ankur Rajpal1, Tarun Kumar1

  • 1Environmental Engineering group, Department of Civil Engineering, Indian Institute of Technology Roorkee (IIT), Roorkee-247667, India

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|September 27, 2014
PubMed
Summary
This summary is machine-generated.

This study evaluated filter media for pathogen removal in wastewater vermifiltration. Riverbed gravel and mud balls showed the best removal rates for pollutants and pathogens, enhancing wastewater treatment.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Microbiology

Background:

  • Domestic wastewater contains various pathogens and pollutants.
  • Vermifiltration is a sustainable wastewater treatment method.
  • The impact of different filter media on vermifiltration efficiency requires further investigation.

Purpose of the Study:

  • To assess the efficacy of different filter media (riverbed gravel, mud balls, coal, glass balls) in pathogen removal during domestic wastewater vermifiltration.
  • To compare the performance of various vermifilter configurations over a three-month period.
  • To determine the optimal filter medium for pathogen and pollutant removal in vermifiltration systems.

Main Methods:

  • Construction and operation of four vermifilters (VFs) using distinct filter media: riverbed gravel (VFR), mud balls (VFM), coal, and glass balls (VFG).
  • Continuous monitoring of wastewater quality parameters, including biochemical oxygen demand (BOD) and chemical oxygen demand (COD).
  • Quantification of pathogen removal (total coliforms, fecal coliforms, fecal streptococci, Salmonella, Escherichia coli) and microbial populations (total heterotrophic bacteria, fungi) over three months.

Main Results:

  • The vermifilter with riverbed material (VFR) achieved the highest BOD (76%) and COD (67%) removal.
  • The vermifilter with mud balls (VFM) demonstrated maximum log removal for total coliforms (2.8), fecal coliforms (2.7), fecal streptococci (2.2), Salmonella (2.1), and E. coli (2.1).
  • High area-based bacterial removal rate constants (2.96–6.68 m/d) were observed, alongside a 2-log increase in heterotrophic bacteria and fungi in VFR and VFM. Earthworm growth (Eisenia fetida) and health were optimal in the glass ball vermifilter (VFG).

Conclusions:

  • Filter media significantly influence pathogen and pollutant removal efficiency in vermifiltration.
  • Riverbed gravel and mud balls are effective media for enhancing wastewater treatment performance, particularly in pathogen reduction.
  • The choice of filter medium impacts microbial community development and earthworm health, highlighting the multifaceted role of each component in vermifiltration systems.