Pilot Scale Studies for Vermifiltration of 1000m3/day of Sewage Wastewater
Keywords:Earthworms, vermifiltration, vermifilter design, wastewater treatment
ABSTRACTâ€” Vermifiltration is a technology in which the combined action of earthwormsâ€™ activity and the adsorption properties of soil, sand and gravel particles on the organic pollutants are applied for wastewater treatment. Vermifiltration was used in sewage wastewater treatment as a cheaper and enviro-friendly technology. 1000m3/day of sewage wastewater was treated in a four layered vermifilter at an Eisenia fetida earthworm density of 8 000 earthworms/m2 in a 3.6m2 soil bed. The vermifilter bed layers comprised of 4-8mm garden soil particles, 8-12mm mixed sand and gravel particles, 30-50mm small aggregates and 70-80mm large aggregates respectively. A vermifilter bed porosity of 0.96 was used. The vermifilter had a hydraulic retention time of 0.082days and a hydraulic loading rate of 0.93m3/m2.day. The vermifilter design effectively resulted in over 90% reduction in BOD, COD, TDSS and turbidity as well as neutralized pH in the sewage wastewater. Proper vermifilter design ensures optimum sewage wastewater treatment for potential use in irrigation.
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