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- W204529281 abstract "Soils consisting of brown earths and lessivés on a basis of pleistocene sands and boulder clays, respectively, have been used as irrigation fields to take up of mechanically treated sewage from a large city for more than 8 decades. Under a current research project, the soil, the percolation zone and the groundwater which have been exposed over such an extended period are studied for characteristic-chemical and microbiological changes. First results of the studies to establish the heavy metals burden of the soils as a consequence of many years of irrigation and the reduction of this burden after discontinuation of irrigation are presented. Exposure to sewage over many years will result in contamination by heavy metals which, however, remains essentially limited to the upper soils. A regeneration period of 18 years has resulted in a reduction of the heavy metals content to ranges normally exhibited by analogous sites that had not been exposed to sewage. In the sewage-exposed soils, the microbiological activity that could be evaluated as one of the characteristics of the capacity to eliminate organic pollutants was found to be clearly elevated. After discontinuation of sewage irrigation, this activity became less. Even under a heavy sewage load, there was an adequate “microbiological filtration effect”. It has been possible to demonstrate a comprehensive influence of sewage irrigation on the chemism of groundwater. Even in groundwater that had been subject to a considerable pollution load, the limiting values of the Drinking Water Regulations of the Federal Republic of Germany were surpassed only in respect of its nitrate content." @default.
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- W204529281 date "1981-01-01" @default.
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- W204529281 title "Dynamics of Soil and Groundwater Pollution by Irrigation of Sewage" @default.
- W204529281 doi "https://doi.org/10.1016/s0166-1116(08)71919-8" @default.
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