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ABSTRACT
The effect of brewery effluent obtained from Guinness Brewery Plc, Benin City on Chlorella vulgaris and Coelastrum microporum were evaluated. The test microalgae were grown in Chu’s No 10 Medium. Different concentrations (5%, 10%, 25%, 50%, 75% and 100%) of the effluent were prepared and dispensed into prelabelled culture vessels. This was followed by inoculation of the experimental setup by introducing 5ml aliquots of the test algae. Results obtained for growth response analysis of microalgae revealed that the early lag growth phase of microalgae occurred between day 0 to day 4. The impacts of varying concentrations of brewery effluents at 0% on Chlorella vulgaris indicated an increased growth response from Day 0-8 and from Day 10-14. The microalgae (Chlorella vulgaris) growth response values in control samples (0% concentration) were reported to vary between 0.020-0.078. The highest growth response (0.078) was obtained at day 8 whereas the least growth response (0.02) in control sample was recorded at day 2. Coelastrum microporum growth response ranged between -0.007 and 0.031 in the control samples, with the highest growth response (0.031) obtained at day 12 and the least growth response (-0.007) in control sample was obtained at day 2. In 75% brewery effluent samples, the growth response of Coelastrum microporum was observed to range from 0.121-0.311. The results revealed that the highest growth response 0.335) was reached at day 10 while the least growth response (0.099) was found at day 2. Both microalgae (Chlorella vulgaris and Coelastrum microporum) investigated were able to grow in the collected brewery waste effluent as indicated by the stimulatory growth response of the algae to the different effluent concentration. This research shows that microalgae use might be an intriguing next step for wastewater treatments since it offers both a tertiary biotreatment and the generation of potentially valuable biomass.
