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Phytotreatment is an approach in which plants are used in the cleanup of contaminated environments. This study, therefore, describes the phytotreatment of abattoir waste water by examining the effectiveness of Apalara abattoir wastewater. Wastewater samples were collected asceptically. The physiochemical results were recorded before and after treatment with water Hyacinth (Eichhornia crassipes). Biological Oxygen Demand and Chemical Oxygen Demand reduction range from before and after treatment 130-0.4 and 1240-475 respectively. The results before and after the biological treatment with water hyacinth showed a considerable reduction in the conductivity and pH value of the abattoir wastewater. The pH was reduced to nearly neutral in all cases studied. The reduction in pH favored microbial action to degrade BOD and COD in the wastewater. The reduction of COD and BOD in wastewater samples collected were devoid of dissolved oxygen. There was an increase in the dissolved oxygen from 0.20 to 3.20 after treatment as indicated by the reduction of BOD and COD in the abattoir wastewater. The study has shown that there were increases in protein content and ash content in abattoir wastewater at the end of the proximate analysis.