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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Sponza, Delia Teresa Gok, Oguzhan |
| Description | Country affiliation: Turkey Author Affiliation: Sponza DT ( Dokuz Eylul University, Engineering Faculty, Environmental Engineering Department, Izmir, Turkey. delya.sponza@deu.edu.tr) |
| Abstract | A laboratory-scale aerobic activated sludge reactor (AASR) system was employed to investigate the effects of SRT on the removal of three less hydrophobic and six more hydrophobic PAHs in the presence of rhamnolipid (RD), emulsan (EM) and surfactine (SR) biosurfactants. Among the biosurfactants it was found that RD exhibits a better performance than the others in the removal of PAHs. At a RD of 15 mg l(-1) aerobic treatment for 25 days SRT was enough to remove over 90% of the total PAHs, 88% of the COD originating from the inert organics (COD(inert)) and 93% of the COD originating from the inert soluble microbial products (COD(imp)). At this SRT and RD concentration, about 96-98% of the RD was biodegraded by the AASR system, 1.2-1.4% was accumulated in the system, 1.1-1.3% was released in the effluent, and 1.2-1.4% remained in the waste sludge. The addition of electron acceptors (NO(3)(-1), SO(4)(-2)) and increasing of temperature up to 45°C enhanced the PAH yields. The most effective PAH degradation occurred in high-oxygenated and neutral pH conditions. The PAH concentration affecting half of the Daphnia magna organism (EC(50) value) was reduced from EC(50)=45.02 ng ml(-1) to the PAH concentration affecting only 6% of the live Daphnia magna (EC(6)=5.30 ng ml(-1)) at the end of the aerobic treatment at a SRT of 25 days. Toxicity removals originating from the PAHs were 96%. |
| ISSN | 03043894 |
| Volume Number | 197 |
| e-ISSN | 18733336 |
| Journal | Journal of Hazardous Materials |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2011-12-15 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Polycyclic Compounds Isolation & Purification Toxicity Sewage Surface-active Agents Chemistry Animals Daphnia Journal Article Research Support, Non-u.s. Gov't Discipline Environmental Science Discipline Environmental Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Pollution Waste Management and Disposal Health, Toxicology and Mutagenesis Environmental Engineering |
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