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Extraction and application of bottom sediments in a closed cycle

100%

Mazur K. , Eymontt A. , Wierzbicki K.

Journal of Water and Land Development

2021

tom no. 51

265--271

Human activities in relation to aquatic ecosystems result in significant economic losses in the form of contamination of water sources, deteriorating its quality and therefore its availability in lakes, water bodies and even in soil. Hence the need for systematic revitalisation or reclamation of water ecosystems. Such actions, in order to be rational, require a detailed understanding of the causes, and then the use of appropriate technology. The need for the above-mentioned actions result from the weather changes that have been noticeable in recent years, as well as environmental pollutants increasing water eutrophication in reservoirs and stimulating the development of some species of cyanobacteria. These cyanobacteria can cause serious water poisoning, especially in water supply systems. Therefore, a rational, comprehensive technology for the removal of bottom sediments and their processing into organic and mineral fertiliser has been developed with properties similar to manure. It also creates opportunities to improve the structure of soils thanks to the supply of organic carbon, the loss of which was found, among others, in also in soils of Poland and EU. These new possibilities of revitalisation hitherto unknown make it possible to a large extent, compliance with environmental requirements when revitalising water reservoirs and soil.

Wpływ naturalnych i sztucznych spiętrzeń wody na redukcję stężeń azotu w ciekach powierzchniowych na przykładzie zlewni Kocinki (Wyżyna Wieluńska)

84%

Michalczyk T. , Bar-Michalczyk D. , Zięba D.

tom Vol. 65, nr 11/2

1339--1343

Groundwater and surface waters are a common, inseparable resource of drinking water. The agricultural Kocinka River catchment in southern Poland is among the case studies within the BONUS - Soils2Sea project (Reducing of nutrient loadings from agricultural soils to the Baltic Sea via groundwater and streams). The study is oriented on exploring the possibilities of reducing nitrates. High concentrations of nitrates are observed in groundwater of the Upper Jurassic Major Groundwater Reservoir No. 326, in which the Kocinka catchment area is located. Previous studies in this area failed to determine whether there is denitrification of nitrates in groundwater. The aim of the study is to investigate the significance of denitrification processes in surface water for the quality of waters in catchments. The influence of artificial and natural water reservoirs on nitrogen removal in the catchment was evaluated. Samples and measurements were taken with particular attention to sites upstream and downstream of the reservoirs. Concentrations of nitrates, conductivity (EC), pH, dissolved oxygen and isotope ratios of oxygen and nitrogen in nitrates were determined in selected locations. The results indicate that nitrate reduction potential differs between the reservoirs. Especially fish ponds show high potential to remove nitrates, depending on seasonal variability.