期刊
CIVIL AND ENVIRONMENTAL ENGINEERING REPORTS
卷 22, 期 3, 页码 157-165出版社
DE GRUYTER OPEN LTD
DOI: 10.1515/ceer-2016-0044
关键词
sewage sludge; conditioning; ecotoxicity; water extract; Daphnia pulex; bioindication analysis
资金
- Czestochowa University of Technology, Institute of Environmental Engineering [BS/MN-401-306/14, BS/PB-401-303/12]
Aim of this study was to evaluate the ecotoxicity of municipal sewage sludge conditioned with polyelectrolytes, taken from selected sewage treatment plant. Using the bioindication analysis overall toxicity was assessed, which allows to know the total toxicity of all the harmful substances contained in sewage sludge, in many cases acting synergistically. To prepare a sample of sludge for the basic test, all analyses were performed with a ratio of liquid to solid of 10:1 (water extract). Daphnia pulex biological screening test was used. A dilution series of an water extract of sludge were prepared to include within its scope the lowest concentration that causes 100% effect and the highest producing less than 10% of the effect within a specified range of the assay. The results of the test were read after 24 and 48 hours. Based on the research and analysis of test results it proved that the sewage sludge conditioned with polyelectrolytes exhibit the characteristics of eco-toxic.
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