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ABSTRACT
A study of the effects of cement industry effluent on the growth of marine algae Volvox aureus and Volvox globator was carried out in the laboratory for 14 days. The test microalgae was grown in seven culture vessels which were in triplicates. Different concentrations 0%, 1%, 5%, 10%, 15% 20% and 25% of cement effluent was used. The growth responses of the microalgae were measured using a spectrophotometer at wavelength 750m. Samples were analyzed at the start and end of the experiment for some physicochemical parameters such as pH, COD, conductivity, temperature, to show the alga phycoremediating potential. Descriptive statistics, inferential (one-way analysis of variance (ANOVA), repeated measure paired t-test and Tukey test were done using Microsoft excel, 2010 and SPSS 20. A comparison of the growth responses of the different treatments showed that there were significant differences (p≤0.05.) with the control (0%) favouring Volvox aureus more. The growth of Volvox aureus through Tukey test showed that 15, 20 and 25 % concentrations had higher mean differences, followed by 1, 5 and 10% concentrations while control had the lowest mean difference. While the results for Volvox globator showed that 5, 10 and 25 % concentrations had higher mean differences, 0, 1, 15 and 20 % concentrations had lower mean differences. There was a significant increase in all physicochemical parameters except for Dissolved Oxygen (DO), Total Organic Carbon (TOC) and Chemical Oxygen Demand (COD). Volvox aureus had a more stimulatory effect than Volvox globator making it a better option in the bioremediation of cement industry effluent.
