Full Length Research Paper
ABSTRACT
Abattoir wastewater treatments were monitored using physicochemical parameters, bacterial profile and biodegradation potential for 28 days at 7 days intervals. The stages of abattoir wastewater treatment were evaluated through determination of physicochemical parameters such as pH, conductivity, total dissolved solid, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, phosphate, nitrate and iron using standard procedures. Bacterial plate counts were determined using the pour plate method with nutrient agar. Characterization and identification of bacteria was done on the basis of cultural appearance of colony, morphology, differential and selective media. The results showed that Escherichia sp., Pseudomonas sp., Enterobacter sp., Klebsiella sp., Staphylococcus sp., Salmonella sp., Streptococcus sp. were common to both abattoir wastewater samples. Serratia sp. was identified only in Ikpoba Hill abattoir wastewater. The bacteria occurrence frequency revealed that Escherichia sp. was dominant (P>0.05) in both abattoir samples while Streptococcus sp. was least abundant. Bacterial plate count revealed significant increase in both abattoir wastewater samples. BOD5/COD ratio revealed that degradation was slow below normal limit of 0.6, and then significantly increased with time. Physicochemical parameters showed significant difference at P>0.05 for both abattoirs. These results suggest that temporal variations of the effluent bacterial community may be useful to predict the wastewater treatment performance and settleability of activated sludge.
Key words: Bacteria profile, biodegradability, physicochemical parameters, bacterial community, abattoir wastewater.
INTRODUCTION
MATERIALS AND METHODS
RESULTS
Total bacterial populations were found to be higher in Ikpoba abattoir effluent than Eyean. Variations recorded in the bacterial counts at various day intervals for Ikpoba and Eyean abattoir effluents are represented in Figure 2. In both abattoir effluents, bacteria counts were found to be high. This result conform the works of Nafarnda et al. (2011) on the elevation bacterial population in wastewaters from the slaughterhouses. Pathogenic species of bacteria identified from the colonies include Escherichia sp., Staphylococcus sp., Enterobacter sp., Salmonella sp. and Streptococcus sp. This is similar to Coker et al. (2001) who identified pathogenic species of bacteria were identified in abattoir wastewater at south western Nigeria.
CONCLUSION
CONFLICT OF INTERESTS
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