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Konstancin-Jeziorna, Poland

Czaplicka-Kotas A.,Warsaw University of Technology | Slusarczyk Z.,Warsaw University of Technology | Pieta M.,Warsaw University of Technology | Szostak A.,GornoSlaskie Przedsiebiorstwo Wodociagow SA
Ochrona Srodowiska | Year: 2012

Statistical relations between the water quality parameters were determined based on the analysis of ammonia nitrogen, nitrite, nitrate, orthophosphate and total phosphorus concentrations observed in Lake Goczalkowickie (impounding reservoir) over the period of 1994?2009. Measuring stations were divided into two groups: those located on the surface of the lake water and those situated at the depth of 2 m and 6 m. The mean value equality test verify ed that at either of the two depths the values of the water quality parameters mea-sured during blooms of diatoms, cyanobacteria and green algae were different from the values of these parameters measured over the period without blooms. When water samples were taken from the surface of the lake, signifi cant differences in the values measured during blooms and the lack thereof were observed with ammonia nitrogen, nitrites and nitrates. The water quality parameters examined exhibited signifi cant differences in their seasonal patterns, except ammonia nitrogen and nitrites, which did not show any signifi cant seasonal variations. The study revealed that phytoplankton bloom affected the correlation between the water quality parameters tested. In many instances, Spearman correlation coeffi cient values that were insignifi cant in the absence of blooms became signifi cant when blooms were present. Source

Czaplicka-Kotas A.,Warsaw University of Technology | Slusarczyk Z.,Warsaw University of Technology | Zagajska J.,Warsaw University of Technology | Szostak A.,GornoSlaskie Przedsiebiorstwo Wodociagow SA
Ochrona Srodowiska | Year: 2010

The results of analyses show that Lake Goczalkowickie (impounding reservoir) has been contaminated with heavy metal ions. In the case of lead and zinc, and temporarily also in the case of copper, their concentrations are many times as high as the relevant geochemical background values. The occurrence of elevated metal concentrations in the water is attributable primarily to the anthropogenic sources located in the drainage area of the lake, such as industrial effluents, agricultural runoffs or fish farming. Exceptions are the concentrations of iron and manganese; their presence in the lake water is due not only to industrial pollution, but also the enrichment of surface waters by pit elution and contact with the artesian water that feeds the impounding reservoir. Analysis of the variations in the average annual metal ion content in Lake Goczalkowickie over the period of 1994-2007 has revealed an upward trend for iron and manganese, and seasonal variations in manganese ion content, which were the smallest in winter and the greatest in summer. The changes in the quantity of manganese ions can be linked with the changes in the oxygenation of the lake water (negative correlation). An average correlation was established between iron ions and manganese ions in the water. The results of calculations have made it clear that no statistically significant trends can be assigned to the average annual concentrations of copper, lead or zinc. As for the copper content, a temporary rise was observed in the early 1990s, after the reservoir had been treated with copper sulfate for algal control. Source

Sawiniak W.,Silesian University of Technology | Kotlarczyk B.,GornoSlaskie Przedsiebiorstwo Wodociagow SA | Nadolska K.,GornoSlaskie Przedsiebiorstwo Wodociagow SA
Ochrona Srodowiska | Year: 2011

Manganese compounds that occur in surface water are virtually not removed during coagulation. The treatment train applied in the Czaniec Waterworks, which includes contact filtration and the use of aluminum sulfate, practically fails to remove the manganese compounds that periodically occur in the impoundment lake, even if their concentration amounts to 0.6 gMn/m3. Full-scale tests have shown that potassium permanganate doses of 0.7 gKMnO 4/m3 applied before the contact filters (with aluminum sulfate) provided efficient removal of manganese compounds from the level of 0.140-0.605 gMn/m3 to the admissible value of 0.05 gMn/m3. Experience gained during one-year obser-vations has shown that the size of the potassium permanganate dose depends not only on the manganese compound content, but also on the concentration of the other lake water components. The inclusion of potassium permanganate into the treatment train eliminated the necessity for temporary discontinuation of the treatment process as a consequence of the high manganese content of the water entering the plant. Source

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