Potential Impacts on Treated Water Quality of Recycling Dewatered Sludge Supernatant during Harmful Cyanobacterial Blooms
| Autor: | Tomofumi Kurobe, Chelsea H. Lam, Thomas M. Young, Franklin D. Tran, Kanarat Pinkanjananavee, Swee J. Teh |
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| Rok vydání: | 2021 |
| Předmět: |
Flocculation
Microcystis Microcystins Sedimentation (water treatment) Health Toxicology and Mutagenesis Harmful Algal Bloom 0211 other engineering and technologies lcsh:Medicine 02 engineering and technology 010501 environmental sciences Toxicology 01 natural sciences Mass Spectrometry Article Water Purification cyanotoxins harmful cyanobacteria Nephelometry and Turbidimetry Water Quality Chemical Precipitation Microcystis aeruginosa Turbidity Effluent 0105 earth and related environmental sciences 021110 strategic defence & security studies Chromatography Liquid biology Sewage Chemistry Drinking Water lcsh:R conventional water treatment Pharmacology and Pharmaceutical Sciences biology.organism_classification Pulp and paper industry Dewatering Clean Water and Sanitation Water treatment Marine Toxins Water quality Biochemistry and Cell Biology Water Microbiology Filtration Chromatography Liquid |
| Zdroj: | Toxins, vol 13, iss 2 Toxins, Vol 13, Iss 99, p 99 (2021) Toxins Volume 13 Issue 2 |
| Popis: | Cyanobacterial blooms and the associated release of cyanotoxins pose problems for many conventional water treatment plants due to their limited removal by typical unit operations. In this study, a conventional water treatment process consisting of coagulation, flocculation, sedimentation, filtration, and sludge dewatering was assessed in lab-scale experiments to measure the removal of microcystin-LR and Microcystis aeruginosa cells using liquid chromatography with mass spectrometer (LC-MS) and a hemacytometer, respectively. The overall goal was to determine the effect of recycling cyanotoxin-laden dewatered sludge supernatant on treated water quality. The lab-scale experimental system was able to maintain the effluent water quality below relevant the United States Environmental Protection Agency (US EPA) and World Health Organisation (WHO) standards for every parameter analyzed at influent concentrations of M. aeruginosa above 106 cells/mL. However, substantial increases of 0.171 NTU (Nephelometric Turbidity Unit), 7 × 104 cells/L, and 0.26 µ g/L in turbidity, cyanobacteria cell counts, and microcystin-LR concentration were observed at the time of dewatered supernatant injection. Microcystin-LR concentrations of 1.55 µ g/L and 0.25 µ g/L were still observed in the dewatering process over 24 and 48 h, respectively, after the initial addition of M.aeruginosa cells, suggesting the possibility that a single cyanobacterial bloom may affect the filtered water quality long after the bloom has dissipated when sludge supernatant recycling is practiced. |
| Databáze: | OpenAIRE |
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