EiT 1 2009

Analiza zasobów mieszkaniowych w gospodarstwach agroturystycznych województwa kujawsko–pomorskiego
When one starts running the agrotoursit service, the level of housing condition the housing potential is very important. The estimation of what one has and what is the technical condition of that lets us prepare the offer well and estimate its capacity. The researches made in the area of kujawsko–pomorskie voivideship have shown, that material resources are satisfactory. The profitable part of the area of these facilities, the satisfactory standard of lodging, the supremacy of the rented guest houses in the hosts’ building and having old style architecture were indicated. The analysis revealed that in the village countryside, the new–built houses are most common, and these do not have a kind of ‘village atmosphere’ and countryside style.
Key words: agrotourism, recources housing, lodging potential
J. Cichowska    str. 3

Badania nad technologią oczyszczania wód balastowych
Ballast water contains numerous organisms belonging to different ecological formations (plankton, neuston, nekton and benthos) which represent species characteristic for the place of water intake. These organisms discharged with ballast water in other ports create a real and proven danger for local ecosystems and people living in coastal area.
This paper presents results of investigations, in laboratory scale, on selected chemical and physical methods of ballast water treatment. The investigations were conducted on selected standard organisms. Effectiveness of biolethal preparation Unisteryl which could be applied as an agent for chemical treatment of ballast water was determined in dependence on the preparation concentration, water salinity, period of contact and temperature. Effect of ultrasounds, as a physical method of plankton organisms killing versus time and vibrations amplitude was investigated. It was found, that Unisteryl in concentration of 50ppm is sufficient to kill bacteria and zooplankton but is not very effective for phytoplankton. Ultrasounds are effective in 100% for zooplankton but their disintegrating action on phytoplankton and bacteria is insufficient.
Performed studies are the first stage, in microscale of works leading to development of multi-stage system (filtration, chemical treatment and ultrasounds) of ballast water treatment on ship with the use of an active preparation.
Key words: ballast water, biodiversity, marine environment, ballast water treatment
H. Modrzejewska, M. Walk, M. Bartoszewicz, M. Michalska        str. 9

Bakterie redukujące siarczany (BRS) w procesach bioremediacji gruntów
This work presents the role of sulfate reducing bacteria (SRB) in soil bioremediation with special consideration of bioavailable heavy metals detoxication process. Authors brought attention to advantages of bioremediation proceeded with SRB participation compared to conventional physicochemical processes like liming. Research suggest that biological processes are usually more efficient in removal of bioavailable heavy metals occurring in low concentrations. SRB not only provide sulfide ions for heavy metals precipitation, but also speed up the precipitation of metal sulfides, which are insoluble in environmental conditions. Taking the opportunity authors also discussed techniques and methods of biological soil purification using soil bacteria, which are sulfate reducing bacteria. That allows to choose the technology feasible for application in rendering harmness chemical contaminants, which cause loss of ecological balance.
Key words: sulfate reducing bacteria, detoxication, remediation, bioremediation, phytoremediation
M. Biegańska, F. Domka    str. 18

Czy dzikie gęsi zagrażają jakości wód Jeziora Góreckiego
w Wielkopolskim Parku Narodowym?
The effect of the presence of wild geese spending winter on Lake Goreckie in the Wielkopolski National Park on the fertility of the lake water was analysed. In late autumn and winter the lake is the site of presence of two species of goose: bean and white–fronted goose (Anser fabalis and Anser albifrons). The study was performed in the southern basin where the geese are not observed and in the north–western basin, which is the site of their night stay. The water parameters measured in the field were: temperature, oxygenation, pH and conductivity. The parameters determined in laboratory conditions included ChZT, organic nitrogen, ammonium, nitrate and nitrit, orthophosphates and total phosphorus. Moreover, bacteriological analysis of water was performed, including determination of the content of coli bacteria, and the influence of geese on the amount of sediment matter measured in sediment traps was analysed. Measurements were performed in the period of the birds’ presence and for the sake of comparison in the period prior to their arrival. The concentrations of the biogenic substances determined in the lake water in the subsurface layer at both basins in the period of the birds’ presence were higher but comparable to those determined before the birds arrival. This observation was explained by analysis of seasonal vertical distribution of biogenic substances in the water column. In the period of summer thermal stratification, the concentrations of biogenic substances in surface layer were very low, while in meta– and hypolimnion they were much higher. In late autumn, when the birds come for wintering, the concentrations of the biogenic compounds equalise as a result of water circulation and the concentration of these substances in the surface layer increases. According to the microbiological study, the concentration of bacteria only from coli type of the north–western basin was higher.  In general, the results have shown that the presence of wild geese staying for the wintering on Góreckie Lake did not have a significant effect on the quality of water. The opinions claiming otherwise are unjustified. The trophic status of the lake is determined to a much greater degree by the release of biogenic substances from bottom sediments and their introduction to circulation in autumn.
Key words: protected area, lake, eutrophication, geese wintering, sediment trap
T. Sobczyński, T. Joniak    str. 29

Modernizacja oczyszczalni ścieków Miejskich Wodociągów sp. z o.o. w Chojnicach – efekt ekologiczny
The paper presents detailed characteristics of the sewage–treatment plant in Chojnice. Methods of waste refinement (mechanical and biological) as well as composting process are also discussed. In recent years the waste composting technology in Chojnice was modernized, resulting in improvements in both quality and amount of produced compost. Table presenting amount of assumed ecological effect due to waste composting is also included.
Key words: sewage–treatment plant, Chojnice, ecological effect, compost, Biogleb
R. Majewski, J. Senetelli, S. Peryt–Stawiarska    str. 35