D10: Impact of Contaminants - Hydromod

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Integrated Water Resource Management for Important Deep European Lakes and their Catchment Areas EUROLAKES D10: Impact of Contaminants Bioaccumulation and Nutrient Balance in the Water FP5_Contract No.: EVK1-CT1999-00004 Version: 4.0 Date: 25/07/01 File: D10-vers.4.0.doc Figure 9-3: Connection between the bioaccumulation of persistent contaminants in fishes and the nutrient ratio in lakes [FENT 1998] Page 60 of 136 The nutrient ratios in lakes and the resulting changes in the organic parts of the lake water could be important for the accumulation of foreign substances. The bioaccumulation of persistent contaminants like PCB and DDT in fishes is connected with the lake’s productivity and the chemistry. The lake’s trophic level and the content of humates have an great influence. In eutrophic lakes (high productivity) the fishes contain less PSB and DDT as in oligotrophic lakes. The reason therefore is the faster growth of the fishes and a faster turnover of the plankton. Supplementary a reduction of the concentration of foreign matter referring to the weight takes place [FENT 1998]. Figure 7-3 shows the connection between bio-accumulation of persistent contaminants in fishes and the nutrient balance in lakes.
Integrated Water Resource Management for Important Deep European Lakes and their Catchment Areas EUROLAKES D10: Impact of Contaminants FP5_Contract No.: EVK1-CT1999-00004 Version: 4.0 Date: 25/07/01 File: D10-vers.4.0.doc Page 61 of 136 10 THE CATCHMENT AREAS Anthropogenic land use, especially agricultural and forestry, has an important influence on the quality of ground and surface water and also influences the whole water balance. Water quality can be influenced by the input of pollutants and nutrients from both diffuse and point sources. Besides this the water balance can be changed by different actions like sealing of land, water regulation and land amelioration [WINKLER 1996]. [WINKLER 1996] refers to the necessity of a registration and evaluation of land use in accordance with their influence on the water balance and quality to protect the ground and surface water as well as water reservoirs, and for the restoration of alreadyimpaired water resources. In the catchments investigated diffuse and point sources are identified and their impacts are described. Point sources include local and industrial sewage, collected by sewers and transported via sewage treatment plants into the surface waters. . Precipitation water directly passed into surface water, sewage from domestic sewage plants as well as untreated sewage from individual farms and sewage water from leaky sewers are also point sources. Inputs like surface runoff, sewage and direct input of substances from the atmosphere are diffuse sources [PRASUHN et al 1996]. Besides these influences a major source of endocrine disrupters is sewage treatment plants because they can not be eliminated by the common treatment methods. In the following the lakes and their catchment areas are introduced and the land use and data about pollution sources concerning the special hazard contamination of endocrine disrupters are described. The Figure 10-1 shows the pollution inputs into water caused by agriculture, transport, industry and households being the major sources of water pollution. Figure 10-1: Pollution inputs into water [BUWAL a]
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D10: Impact of Contaminants - Hydromod

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