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J Korean Soc Environ Eng > Volume 41(10); 2019 > Article
J Korean Soc Environ Eng 2019;41(10): 524-531. doi: https://doi.org/10.4491/KSEE.2019.41.10.524
생물계면활성제 람노리피드를 이용한 심해저 광업 잔재물 내 중금속 정화
김효진1, 김경련1,2
1한국해양과학기술원
2과학기술연합대학원대학교 KIOST 스쿨
Remediation of Heavy Metals in Deep-sea Mining Tailings by Using Rhamnolipid
Hyojin Kim1, Kyoungrean Kim1,2
1Korea Institute of Ocean Science and Technology (KIOST)
2KIOST School, University of Science and Technology (UST)
Corresponding author  Kyoungrean Kim ,Tel: 051-664-3198, Fax: 051-405-9330, Email: kyoungrean@kiost.ac.kr
Received: August 23, 2019;  Revised: September 23, 2019;  Accepted: October 1, 2019.  Published online: October 31, 2019.
ABSTRACT
Objectives
Rhamnolipid for the remediation of heavy metals in deep-sea mining tailings originated from manganese nodules was mainly focused in this research. As continued development depletes land-based metal resources, deep-sea natural resources such as manganese nodules collected from the Clarion-Clipperton Fracture Zone in the Pacific Ocean are inevitably drawing attention as useful alternative resources. The London protocol 1996 (LP) under International Maritime Organization (IMO) and the International Sea-bed Authority (ISA), however, will come up with the environmental guidelines of deep-sea mining tailings by early 2020s. Accordingly, there are urgently required to develop technologies that remediate heavy metals of deep-sea mining tailings. In this research, rhamnolipids which were known as biosurfactants was used to extracting agent for heavy metals in deep-sea mining tailings.
Methods
Sample (20-63 µm, manganese nodules) made of 2% (w/v) liquid using ultrapure water were stirred and mixed with a rhamnolipid solution (0.05%, 0.1%, 0.2%, 0.3%) for various elapsed time, to evaluate the possibility of remediation of heavy metals in deep-sea mining tailings using rhamnolipid. Each mixture was analyzed for heavy metals eluted into the liquid after solid-liquid separation.
Results and Discussion
Rhamnolipid was effective in removal of heavy metals and environmentally friendly. The extracted concentration of copper (Cu), zinc (Zn), nickel (Ni), and cadmium (Cd) were correspondingly enhanced with specific elapsed time and rhamnolipid’s concentrations, also.
Conclusions
The results of this research should be used as basic data for the actual development of the remediation technology for deep-sea mining tailings using rhamnolipid in the future.
Key Words: Deep-sea Mining Tailings, Biosurfactants, Rhamnolipids, Heavy Metals, Remediation
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