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ABSTRACT
Conventional soil remediation techniques have significant environmental risks, prompting the need for more sustainable methods like bioremediation. This study focuses on evaluating Cassava Mill Effluent (CME) as a potential soil remediation agent by analysing its influence on soil pH and Exchangeable acidity in crankcase oil-contaminated soil. Soil samples underwent different CME treatment frequencies; once, monthly, weekly and daily with control groups inclusive. The results revealed that contaminated soil samples experienced varying reduction in Exchangeable acidity over a month, with daily CME treatments showing the most pronounced effect. Conversely, non-contaminated soil samples also exhibited a decrease in Exchangeable acidity, likely due to other environmental factors. Changes in soil pH were observed, with general control soil maintaining stability, while polluted soil without CME treatment saw a significant pH decrease. Daily treated soil sample showed an increase in soil pH. This suggests that microbial processes and the production of organic acids may contribute to pH changes. Therefore, Cassava Mill Effluent can be used to ameliorate acidic soil with daily treatment. This study highlights the intricate relationship between CME, crankcase oil contamination, and soil properties. It underscores the importance of considering various biological materials for bioremdiation of hydrocarbon polluted soil as it provides valuable insights into the dynamic interactions between contaminants and soil properties.
