The Toxicity of Aluminium Salts to Lecane Inermis Rotifers: Are Chemical and Biological Methods Used to Overcome Activated Sludge Bulking Mutually Exclusive?
| Autor: | Edyta Fiałkowska, Wioleta Kocerba-Soroka, Beata Klimek, Janusz Fyda, Łukasz Sobczyk, Agnieszka Pajdak-Stós |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
education.field_of_study
Flocculation Aluminium chloride biology Chemistry Population Environmental engineering Rotifer General Medicine biology.organism_classification rotifers EC50 wastewater treatment Activated sludge medicine toxicity of Al-salts Sewage treatment Sludge bulking Food science education combined stressors medicine.drug |
| Zdroj: | Archives of Environmental Protection. 39:127-138 |
| ISSN: | 2083-4810 2083-4772 |
| Popis: | The aim of this study was to assess the effects of two flocculants that are often used to overcome activated sludge bulking problems - aluminium chloride, AlCl3, and aluminium sulphate, Al2(SO4)3 - on Lecaneinermis (Rotifera, Monogononta) at three different temperatures: 8, 15 and 20°C. The mean EC50 value (effective concentration, mg dm-3) calculated for the 24 h mortality test was 0.012 mg Al3+dm-3. Next, the effects of low concentrations of the Al-salts on the population development from single individuals (parthenogenetic females) were tested in a 21-day experiment. At concentrations as low as EC4.8 and EC0.48, both Al-salts affected rotifer population negatively. However, temperature was the most pronounced factor that modified the toxicity of the Al-salts to the rotifers. On the 12th day of the experiment, there were significant interactions between temperature and the Al-salts, indicating that the chemicals were more toxic to the rotifers at 20°C than at lower temperatures. The weaker rotifers sensitivity to Al-salts (especially to AlCl3) in temperatures below 15°C, when the biggest problems associated with sludge bulking occurs,may means use both rotifers and chemicals reasonable and effective. |
| Databáze: | OpenAIRE |
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