Application of bioremediation for the purification of oil-contaminated soil in Okinawa.
In recent years, in Okinawa, soil contamination due to oil and other substances has become apparent with the return of U.S. military bases, leading to a serious issue. The main method for addressing oil contamination in Okinawa is treatment through lime mixing; however, this raises concerns as it alters the properties of the soil. There is growing interest in the effectiveness of bioremediation and its applicability. Therefore, our company conducted treatability tests (biotreatment suitability tests) using soil from Okinawa. 【Target Soils】 ■ High-concentration oil-contaminated soil (Kunigami Marge) ■ Medium-concentration oil-contaminated soil (Jagaru) *For more details, please feel free to contact us.
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**Testing Method** 1. Sieve the soil sample through a 5mm mesh to achieve uniformity. 2. Collect a sample before the test (initial value) and send it to a third-party analysis organization for TPH analysis, and conduct measurements at our company. 3. Place 1kg of soil into a stainless steel tray. 4. Dissolve essential element solutions and nutrients in tap water (after dechlorination), add them to the soil from step 3, and mix well. 5. Add a composite microbial agent and mix well. (For tests targeting moderately contaminated oil soil, create a series without additives for comparative testing.) 6. Stir once daily and replenish moisture as needed (once a day, enough to keep the surface moist). 7. On each designated test day, observe soil properties and collect samples for analysis and measurement, similar to step 2. **Test Results** Confirmed a decrease in TPH concentration and an increase in total microbial count, with no growth inhibition observed for the microorganisms in the soil. It was determined that the purification of oil content in the soil using the composite microbial agent is sufficiently possible, regardless of soil type or TPH concentration. *For more details, please feel free to contact us.*
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Bio Rangers was established in 1998 as a company that quickly incorporated bio (microorganisms) into soil and groundwater pollution countermeasures in the industry. From treatability to soil and groundwater measures and drainage measures, Bio Rangers consistently supports the remediation of oil and VOC contamination.