Application of the Vermifiltration Technology in Sewage Wastewater Treatment
Keywords:Bio-filter, earthworms, Eisenia fetida, sewage wastewater treatment, vermifiltration technology
Vermifiltration was used for treatment of sewage wastewater using the Eisenia fetida earthworm species. The earthwormsâ€™ gut acted as a bioreactor whereby there was reduction in the sewage wastewaterâ€™s solid and liquid organic wastes through ingestion and expelling these as vermicompost. 500 earthworms were used in the vermifilter over a 5 period of days. The treated water pH increased from being acidic to neutral. The sewage wastewater biological oxygen demand (BOD5), chemical oxygen demand (COD), total dissolved and soluble solids (TDSS) and turbidity decreased by 98%, 70%, 95% and 98% respectively through vermifiltration. Vermifiltration significantly decreased the sewage waterâ€™s physicochemical parameters compared to an ordinary bio-filter without earthwormsâ€™ presence. The vermi-treated sewage water compared well with the set standards for irrigation water. Vermifiltration technology can therefore be applied as an environmentally friendly technique for sewage water treatment for irrigation purposes.
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