摘要:

AbstractZinc is a fairly abundant metal, it has been estimated that zinc represents 0.004 percent of the earth's crust and is twenty‐fifth in the order of abundance. Its concentrations in surface waters vary greatly with locality; the highest concentrations of zinc have been observed in areas with acid mine drainage, but zinc enters surface waters in many other ways. Chemical thermodynamic calculations summarized by solubility graphs are given. The zinc solubility may be significantly controlled by stream sediments; Zn concentrations of sediments from various areas are given. Many techniques for extraction from sediments have been developed, they differ in efficienc

ISSN:0323-4320    

DOI:10.1002/aheh.19850130602

出版商:WILEY‐VCH Verlag GmbH    

年代:1985

数据来源: WILEY

摘要:

AbstractWater and sediment samples from two surface water systems were analysed for210Pb and stable lead in order to elucidate the environmental importance and fate of210Pb released from uranium mining. In one system mine drainage waters treated by precipitation of barium sulfate contained a considerable activity of210Pb in particulate form. Spoil piles were the main source of210Pb in the second system, with the dissolved210Pb being the predominant migration form. In both systems the concentration of210Pb rapidly decreased with distance from the source indicating that waterborne210Pb did not represent an environmental problem. Uranium mining did not add significant amounts of stable lead into the surface water systems. It has been found that bottom sediments are a sensitive indicator of the pollution of surface waters with210Pb.

ISSN:0323-4320    

DOI:10.1002/aheh.19850130603

出版商:WILEY‐VCH Verlag GmbH    

年代:1985

数据来源: WILEY

ISSN:0323-4320    

DOI:10.1002/aheh.19850130604

出版商:WILEY‐VCH Verlag GmbH    

年代:1985

数据来源: WILEY

摘要:

AbstractThe momentary condition concerning the haematological, physiological, macro‐and microscopical constitution of the fishes of the Weser at Grohnde was investigated.The fishes were caught electrically at 22 positions in front of and behind the power‐station at Grohnde. In the experiments the blood parameters, the biochemical, enzymatical, parasitological and microscopical changes of several species of fishes were analysed.You can see the details of these changes in the figures and pictures of the publication. It is supposed that organic toxic substances are given into the river in front of the power station, because in this region an industrial undertaking is posted.But also the general water quality of the Weser shows a significant toxicological degree, though the content of salt had been reduced in the former time.One can see that at all positions the blood parameters have changed, we also found haemorrhages in the gills, liver, kidney and spleen, little blood swellings, lymphocysts, necrosis, external and internal parasites, enzymatical changes and inflammations of the liver, kidney and myocard in the fishes. The investigations are being contin

ISSN:0323-4320    

DOI:10.1002/aheh.19850130605

出版商:WILEY‐VCH Verlag GmbH    

年代:1985

数据来源: WILEY

摘要:

AbstractContinuous denitrification was investigated in the system acetate medium—mixed culture with the pH auxostat. The cultivation method was applicable under defined conditions. The maximum specific growth rate obtained was 0.37… 0.38 h−1. A comparison with data from the chemostat was perf

ISSN:0323-4320    

DOI:10.1002/aheh.19850130606

出版商:WILEY‐VCH Verlag GmbH    

年代:1985

数据来源: WILEY

摘要:

AbstractIn the present work the kinetics and the feasibility of batch anaerobic filter operations for the treatment of beet molasses distillery slops have been investigated.Up to 50% of the influent COD up to 25 g/l are removed after 5… 10 h and up to 80% after 24… 40 h treating time. Highest removal rates were obtained for 50% removal and influent COD concentration ≧13 kg. m−3. The highest methane productivity was observed in the same range of COD influent concentration during the first 10 hours (initial velocity) of the treatment.The benefits of the anaerobic treatment of waste water applying systems with biomass retention are di

ISSN:0323-4320    

DOI:10.1002/aheh.19850130607

出版商:WILEY‐VCH Verlag GmbH    

年代:1985

数据来源: WILEY

ISSN:0323-4320    

DOI:10.1002/aheh.19850130609

出版商:WILEY‐VCH Verlag GmbH    

年代:1985

数据来源: WILEY