• Effects of Heavy Metal and pH on Bacterial Growth Isolated from the Contaminated Smelter Soil
  • Keum, Mi-Jung;Yoon, Min-Ho;Nam, In-Hyun;
  • Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources (KIGAM);Department of Bio Environmental Chemistry, Chungnam National University;Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources (KIGAM);
  • 제련소 인근 토양에서 분리한 박테리아 생장에 미치는 중금속 및 pH 영향
  • 금미정;윤민호;남인현;
  • 한국지질자원연구원 지구환경연구본부 환경지질연구실;충남대학교 농업생명과학대학 생물환경화학과;한국지질자원연구원 지구환경연구본부 환경지질연구실;
Abstract
The contaminated soil at abandoned smelter areas present challenge for remediation, as the degraded materials are typically deficient in nutrients, and rich in toxic heavy metals and metalloids. Bioremediation technique is to isolate new strains of microorganisms and develop successful protocols for reducing metal toxicity with heavy metal tolerant species. The present study collected metal contaminated soil and characterized for pH and EC values, and heavy metal contents. The pH value was 5.80, representing slightly acidic soil, and EC value was 13.47 mS/m. ICP-AES analytical results showed that the collected soil samples were highly contaminated with various heavy metals and metalloids such as lead (183.0 mg/kg), copper (98.6 mg/kg), zinc (91.6 mg/kg), and arsenic (48.1 mg/kg), respectively. In this study, a bacterial strain, Bacillus cereus KM-15, capable of adsorbing the heavy metals was isolated from the contaminated soils by selective enrichment and characterized to apply for the bioremediation. The effects of heavy metal on the growth of the Bacillus cereus KM-15 was determined in liquid cultures. The results showed that 100 mg/L arsenic, lead, and zinc did not affect the growth of KM-15, while the bacterial growth was strongly inhibited by copper at the same concentration. Further, the ability of the bacteria to adsorb heavy metals was evaluated.

Keywords: Smelter soil;Heavy metal;Bacteria;Adsorption;Soil bioremediation;

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This Article

  • 2015; 20(4): 113-121

    Published on Aug 31, 2015

  • 10.7857/JSGE.2015.20.4.113
  • Received on Aug 10, 2015
  • Revised on Aug 21, 2015
  • Accepted on Aug 25, 2015