Combining physico-chemical analysis with a Daphnia magna bioassay to evaluate a recycling technology for drinking water treatment plant waste residuals

Ecotoxicology and Environmental Safety
Ting ChenFu-Yi Cui

Abstract

Recycling water treatment plant (WTP) waste residuals is considered to be a feasible method to enhance the efficiency of pollutant removal. This study also evaluated the safety and water quality of a pilot-DWTP waste residuals recycling technology by combining physical-chemistry analysis with a Daphnia magna assay. The water samples taken from each treatment step were extracted and concentrated by XAD-2 resin and were then analyzed for immobilization and enzyme activity with D. magna. The measured parameters, such as the dissolve organic carbon (DOC), UV254 and THM formation potential (THMFPs) of the recycling process, did not obviously increase over 15 days of continuous operation and were even lower than typical values from a conventional process. The extract concentration ranged from 0 to 2 Leq/ml as measured on the 7th and 15th days and the immobilization of D. magna exposed to water treated by the recycling process was nearly equivalent to that of the conventional process. Both the superoxide dismutase (SOD) and the catalase (CAT) activity assay indicated that a lower dose of water extract (0.5, 1, 1.5 Leq/ml) could stimulate the enzyme activity of D. magna, whereas a higher dose (2 Leq/ml at the sampling point C3, R3, R4 ...Continue Reading

References

May 24, 2005·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Carlos BarataCinta Porte
Jul 1, 2005·The Science of the Total Environment·Emma L SharpBruce Jefferson
Sep 5, 2008·Environmental Toxicology and Chemistry·Wen-Hong FanRong Zhang
Aug 29, 2014·Ecotoxicology and Environmental Safety·Maria D PavlakiSusana Loureiro

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