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Title: Potential Synchronous Detoxification and Biological Treatment of Raw Sewage in Small Scale Vermifiltration Using an Epigeic Earthworm, Eisenia fetida
Authors: Kuipa, Pardon K.
Mlambo, Sibonani S.
Mudziwapasi, Reagan
Chigu, Nomathemba L.
Utete, Beaven
Keywords: Vermifiltration
Raw sewage
Eisenia fetida
Issue Date: Jun-2016
Publisher: Chinhoyi University of Technology
Abstract: This study assesses the potential synchronous treatment and detoxification of raw sewage during small-scale vermifiltration. A pilot small-scale bioreactor was packed with the epigeic red worm, Eisenia fetida, in a static black-soil medium. It was operated at a hydraulic loading rate of 0.193 m3/m2/h and a hydraulic retention time of 0.481 hr. Vermifiltration resulted in significant reduction in toxicity using the Daphnia 48hr-LC50 acute-toxicity assay. Average removal efficiencies for BOD5 and TSS of 90.6% and 98.4% respectively were recorded after vermifiltration. The vermifilter was more efficient than the negative control in pollutant removal. There was no statistically significant difference between the negative control and the vermifilter in the reduction of total coliforms and faecal coliforms. Principal Component Analysis (PCA) indicated that COD, turbidity, TDS, TSS, and BOD5 have a close association and major influence on reducing acute toxicity. The high reduction in toxicity, BOD5 and TSS attributable to vermifiltration of raw sewage indicate the success and potential of vermifiltration in clarification, detoxification and biological treatment of raw sewage.
Appears in Collections:Department of Animal and Rangeland Management

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