Abstract
The relative effectiveness of water hyacinth (Eichhornia crassipes) (phytoremedian), bacteria and fungi (bioremedians) used for the purification of domestic sewage was carried out using Completely Randomised Design (CRD) replicated three times. Physical, bacteriological and chemical properties of domestic sewage were investigated before and after purification. The results show that for suspended solids, cultured tanks treated with 2kg water hyacinth reduced the sewage concentration from 73mg/l to 37.5mg/l, dissolved solids was reduced from 312mg/l to 266mg/l, Biological Oxygen Demand (BOD) was reduced from 11.2mg/l to 4.37mg/l, Chemical Oxygen Demand (COD) was reduced from 7.6mg/l to 2.7mg/l. Dissolved Oxygen increased from 6.8mg/l to 7.17mg/l for 2kg hyacinth treatment due to photosynthesis but reduced to 3.7 for fungi. The cultured tanks treated with bacteria performed best in reducing turbidity and bacteriological properties of sewage. Turbidity was reduced from 5.8NTU to 1.2NTU for tanks cultured with bacteria. During the first three weeks, the hyacinth's growth was very rapid. It effectively depleted the nutrients present in the sewage, by the 4th week, gradual wilting of water hyacinth was noticed and by the end of the 5th week, serious wilting occurred due to deficiency in essential nutrients. The 2kg water hyacinth tanks wilted permanently due to total consumption of sewage. The results show that purification potential of water hyacinth is related to plants population with the 2kg hyacinth's tanks purifying better than the 1kg hyacinth density and also that bacteria purifies sewage better than fungi. Generally the 2kg water hyacinth was best in reducing the physio-chemical properties of the sewage better than the other treatments applied while the tanks treated with bacteria performed best in reducing bacteriological properties of sewage. Key words: Purification, sewage, phytoremediation, water hyacinth, bioremediation, bacteria and fungi.
Highlights
Introduction bioremediatorsBioremediation can take placeBioremediation was defined by the in two conditions that are aerobic and anaerobicAmerican Academy of Microbiology as the use conditions
By volume consumed is to express uptake of sewage by biota or ability of bioremediators to take up chemical pollutants in sewage? Clearly elaborate on the mechanism for bioremediation by “bioremedians” Suspended Solids The suspended solid at the point of collection was 73mg/l
The study showed that both water hyacinth (Eichhornia Crassipes) and Bioremedians are effective in purifying domestic sewage with little or no harmful effect on the ecology
Summary
Introduction bioremediatorsBioremediation can take placeBioremediation was defined by the in two conditions that are aerobic and anaerobicAmerican Academy of Microbiology as the use conditions. Bioremediation was defined by the in two conditions that are aerobic and anaerobic. Water hyacinth (Eichhornia of living organisms to reduce or eliminate crassipes) is a free floating perennial aquatic environmental hazards resulting from plant, a member of pickerelweed familyaccumulations of toxic chemicals and other Pontederiaceae and Genus–Eichhornia. It has a hazardous wastes (Gibson and Sayler, 1992). Floating perennial macrophyte that can grow to Bioremediation may occur due the actions of either indigenous microorganisms Wei and Zhou microorganism (those that are imported from (2004), Xia and Ma (2006), Adeniran (2009)
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