Efficiency of Drinking Water Treatment Processes. Removal of Phytoplankton with Special Consideration for Cyanobacteria and Improving Physical and Chemical Parameters
Marlena Piontek1, Wanda Czyżewska2
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1Institute of Environmental Engineering, University of Zielona Góra,
Prof. Szafrana 15, 65-516 Zielona Góra, Poland
2Water and Wastewater Plant in Zielona Gora, Poland Sp. z o.o.,
Zjednoczenia 120A, 65-120 Zielona Góra, Poland
Pol. J. Environ. Stud. 2012;21(6):1797–1805
The goal of our research was to show efficiency of the micro-sieves during the water treatment process in the water treatment plant (WTP) in Zawada near the city of Zielona Góra, Poland. This paper presents changes in water quality after particle-filtration (filtration above 10 μm).The samples were collected in the Zawada WTP from January to December. The reduction of the amount of phytoplankton, including cyanobacteria, caused by micro-sieves varied throughout 2009 and was between 21.2 and 93.3%. The maximum concentration of cyanobacteria in raw water was observed May 6 and amounted to about 400,000 org. (organisms)/ L and microcystins (MCs) content in raw water was below 0.2 μg/L and were absent in potable water. That day we observed a reduction of cyanobacteria after particle-filtration amounted to 83% and reduction of phytoplankton 84%. The particle-filtration process reduced organoleptic water parameters: color, turbidity, and total suspended solids. As a result of the decrease of suspend content, decreases of iron, manganese, and chemical oxygen demand (COD) were observed.