Efficiency of Drinking Water Treatment Processes. Removal of Phytoplankton with Special Consideration for Cyanobacteria and Improving Physical and Chemical Parameters

摘要

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 Gora, Poland. This paper presents changes in water quality after particle-filtration (filtration above 10μm).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. (organ-isms)/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.