Effect of fly ash-lime treatment on the acute toxicity of greywater towards Daphnia magna
| Autor: | Nosiphiwe P. Ngqwala, Sinoyolo Nondlazi, Roman Tandlich, Bongumusa M. Zuma, PK Mensah |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:QH426-470
Laundry Health Toxicology and Mutagenesis lcsh:Biotechnology 0208 environmental biotechnology Daphnia magna 02 engineering and technology 010501 environmental sciences engineering.material Greywater 01 natural sciences Analytical Chemistry lcsh:TP248.13-248.65 Chronic toxicity Effluent reproductive and urinary physiology 0105 earth and related environmental sciences Lime Acute toxicity biology Chemistry fungi Mixed effluent Pulp and paper industry biology.organism_classification 020801 environmental engineering lcsh:Genetics Small-scale irrigation Fly ash engineering Food Science Biotechnology |
| Zdroj: | Nova Biotechnologica et Chimica, Vol 18, Iss 1, Pp 59-65 (2019) |
| Popis: | Acute toxicity of raw and treated greywater towards Daphnia magna was assessed in this study. Treatment was performed with exposure of greywater to the fly-lime mixture After 48 h of exposure, 100 % mortality of D. magna was recorded when testing the following volumetric fractions of the raw greywater streams in the tested liquid medium (%; v/v): 10 % for kitchen greywater, 5 – 10 % for bathroom greywater and 1.25 – 10 % for laundry greywater. After greywater treatment with the fly-ash-lime mixture with pH adjustment to 7.0, 80 % of neonates of D. magna survived after exposure to treated laundry greywater in all dilutions at 48 h. At the same time, 100 % of neonates survived exposure to treated bathroom and kitchen greywater at all volumetric fractions. Therefore greywater had acute toxicity to D. magna, i.e. greywater treatment was required before its discharge or reuse. Values of the Pearson’s correlation coefficient between the chemical components of the raw greywater and treated greywater and the survival of D. magna indicated a lack of statistically significant correlation at 5 % level of significance (p-value > 0.05 in all cases), i.e. the survival of D. magna was independent of the concentration of chemical constituents in greywater samples tested. Further studies will have to be conducted on the chronic toxicity of the greywater effluent after treatment with the fly-lime mixture. Experiments from this study will have to be re-run for the fully scaled-up version of the fly-lime mixture-based greywater treatment systems. |
| Databáze: | OpenAIRE |
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