Abstract
Oil sludge (OS) is the toxic product of various oil refinery processes. Oil sludge biophytoremediation is sustainable remediation efforts were conducted to reduce OS toxicity level and they also need to be monitored through toxicity test. In this study, the toxicants were OS postbiophytoremediation for 24 months (OS24) and 40 months (OS40), and were tested to Daphnia magna. The toxicity test consisted of Range Finding Test, acute and chronic toxicity test. The purpose of this research is to obtain the LC50 value of each OS and the chronic effects shown by D. magna. The method in this study was experimental with Completely Randomized Design (CRD). The LC50-96 hours values were calculated from 50% of dead individuals while D. magna reproduction was calculated from the number of neonates (offspring) produced within three weeks. The LC50 of OS24 and OS40 were 0.042 ppm and 0.366 ppm respectively. Both were categorized as ‘extremely toxic’ refer to Swan, 1994, observed chronic effects were reproduction delays and a decrease in the number of neonates.
Highlights
Biophytoremediation is Green Sustainable Technology for Industrial Waste Management
The toxicity test consisted of the Range Finding Test (RFT) or the preliminary test that is required to find the upper and lower limit of oil sludge concentration that killed 50% population of test animals
RFT was carried out for one day and it was discovered that the range for OS postbiophytoremediation for 24 months (OS24) is between 1 ppm - 0,01 ppm whereas the range for OS40 is between 1 ppm - 0,1 ppm
Summary
Oil sludge is a waste derived from the petroleum industry and includes hazardous and toxic substances that must be biologically managed. Oil sludge in soils pose a risk of leaching or the separation process of soluble (solute) and insoluble substances (inert) through the hydrological cycle. The chemical compounds of oil sludge can accumulate in aquatic organisms’ tissues and the buildup of these hazardous materials can travel through the food chain which will be harmful for humans to consume any of those aquatic animals.
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