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Biofilm Growth Characteristics at Different Diesel Leakage Concentration

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Author(s): Fang Liu | Wei Yang | HuiYun Zhong | JinJin Lu | Chaocheng Zhao

Journal: International Journal of Environmental Science and Development
ISSN 2010-0264

Volume: 4;
Issue: 2;
Start page: 111;
Date: 2013;
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Keywords: Circulating cooling water | leakage | diesel | biofilm | growth characteristics.

ABSTRACT
Petroleum products leakages result in important effects on the normal operation of circulating cooling water system. However, relatively little research has been done to explore effects of petroleum products leakages on biofilm growth characteristics. In this study, diesel as the experimental subject representing petroleum products, effects of diesel addition on biofilm growth characteristics were investigated. Increase of diesel addition led to biofilm EPS increase with diesel concentration less than 200 mg/L, then EPS content were kept relatively stable with diesel concentration more than 200 mg/L. Protein contents were found at relatively higher levels than polysaccharides in the biofilm with diesel concentration more than 200 mg/L. Expect for 100 mg/L diesel, increasing diesel concentration enhanced biofilm detachment ratio with respect to the control test. Although biofilm wet weight tended to increase with diesel concentration rising from 0 to 1500 mg/L, there was a marked reduction in lipid phosphorus content with increase of diesel concentration from 200 to 1500 mg/L. The reduction indicated that diesel was toxic to microbial population in biofilm.

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