Screening the toxicity of phosphorous-removal adsorbents using a bioluminescence inhibition test

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• 作者：Steven J. Duranceau ; Paul G. Biscardi and Danielle K. Barnhill
• 关键词：adsorption ; bioluminescent bacteria ; eutrophication ; nutrients ; water quality
• 刊名：Environmental Toxicology
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：31
• 期：4
• 页码：489-495
• 全文大小：381K
• ISSN：1522-7278

文摘

When found in excess, phosphorus (P) has been linked to surface water eutrophication. As a result, adsorbents are now used in P remediation efforts. However, possible secondary toxicological impacts on the use of new materials for P removal from surface water have not been reported. This study evaluated the toxicity of adsorbent materials used in the removal of P from surface water including: fly ash, bottom ash, alum sludge, a proprietary mix of adsorbents, and a proprietary engineered material. Toxicity screening was conducted by performing solid-liquid extractions (SLEs) followed by the bacterial bioluminescence inhibition test with a Microtox® M500. Of the materials tested, the samples extracted at lower pH levels demonstrated higher toxicity. The material exhibiting the most toxic response was the iron and aluminum oxide coated engineered material registering a 66–67% 15-min EC50 level for pH 4 and 5 SLEs, respectively. However, for SLEs prepared at pH 7, toxic effects were not detected for this engineered material. Fly ash and bottom ash demonstrated between 82 and 84% 15-min EC50 level, respectively, for pH 4 SLE conditions. Dried alum sludge and the proprietary mix of adsorbents were classified as having little to no toxicity.