Utilization of Banana, Pineapple and Watermelon Wastes-Substrate: As Consortiums to Remediating Cyanide Polluted Soil
Year: 2018
Type: article
Abstract: The act of processing cassava for varied food products has come with unguided and wide-spread contamination of cyanide in the environment.The need for effective reduction in cost to enable remediation of cyanide-contaminated sites from cassava mill factories is the purpose of this investigation.This involves bio-stimulation of organic wastes with indigenous microorganisms to degrade cyanide.The application of organic wastes as a substrate for the removal of cyanide was adopted.Banana, pineapple, and watermelon wastes were selected and bio-stimulated in cyanide contaminated soil.Each set-up containing 100 g of Cassava Mill Effluent (CME) contaminated soil was added with varied percent -1, 5 and 10% of pineapple, banana, and watermelon waste, respectively.The monitoring of cyanide reduction was studied for 28 days.Periodic collection of soil samples from each set-up was done at four days interval to determine total cyanide concentration, total heterotrophic bacteria, and enzymes activities.Results indicated that after 28 days of applying the 10% watermelon, 5% pineapple and 1% banana waste, the 10% watermelon waste gave a better cyanide reduction compared to pineapple and watermelon waste treatment.The one phase-decay equation of 1%banana, 5% -pineapple and 10% -watermelon waste treatment gave the shortest disintegration rate.The soil physicochemical properties, agro waste, microbial population, soil enzymes activities, soil microbial respirometric index, the bio-parameters sensitivity, carbon, nitrogen, and phosphorus were determined.The first order kinetics model revealed by the nth order algorithm; pineapple waste treated soil had the highest reduction rate -0.9098/day of CME with half-life -6.98 days.The 1% banana and 10% watermelon treated soil samples have the cyanide reduction rates -0.9315/day and 0.8997/day.The cyanide reduction rate was significantly higher than the untreated contaminated CME (control) soil -0.8975/day.The microbial counts and the three agrowaste treatment samples increase in day 4-16 (2.20×10 8 to 6.40×10 8 CFU/g) for 5% -pineapple; 1% -banana increased from 20×10 8 to 8.90×10 8 CFU/g (day 20 -28) and 10% -banana increased -1.20×10 8 to 8.70×10 8 CFU/g (day 4-20); 1% -watermelon increased from 8.40×10 8 to 8.80×10 8 CFU/g (day 20-24) and 10% watermelon increased from -8.10×10 8 to 8.70×10 8 CFU/g (day 24-28), than the control which showed increase from 3.40×10 8 -7.20×10 8 CFU/g (day 4-12) during the 28 days of remediation study.Soil organic carbon content
Language: English
Topic: Cassava research and cyanide
Subfield: Plant Science
Domain: Life Sciences
Open Access status: hybrid
OpenAlex ID: W2802801439