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1

Application of biological processes in manganese elimination from ground water

100%

Olnczuk-Neyman K., Prejzner J.

Biotechnologia

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1994

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issue 4

154-163

EN

The role of microorganisms in manganese oxidation and reduction precessing taking part in ground water enviroment is presented.Manganese oxidation catalysed by bacteria takes place in presence of dissolved oxygen, at relatively high Eh conditions about 600 mV and pH 6,5-7 and this process proceeds more rapidly than any non-biological reaction.Chemical oxidation of manganese could be achieved only by raising the pH to 8,5 0r over.Manganese (IV) is reduced already at the Eh value +300 nV and pH values between 6 and 7.The reduction process can be catalysed by bacterial enzymatic systems and coupled with oxidtion of organic matter or indirectly by bacterial metabolites.Occurrence of manganese oxidizing bacteria in ground waters as well as effect of environmantal factors on manganese removal by slow sand filtration is described

2

Microbiological, sanitary and epidemiological analysis of the biological membrane and effluent of the packed-bed reactor in the biomembrane system applied to the removal of nitrates from ground water

100%

Wasik E., Blaszczyk M., Bohdziewicz J.

Biotechnologia

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1999

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issue 4

151-160

EN

The paper presents results of the microbiological research on the biological membrane of anaerobic packed-bed reactors (including pathogens) and post-culture effluent in the cultures of denitrifying bacteria in the medium containing: nitrates from ground water and ethanol, sodium acetate or methanol in the hybrid system biological denitrification-ultrafiltration. First, the most effective and safe source of carbon and energy in the cultures of denitrifying bacteria was determined, and subsequently, the post-culture effluent was subjected to ultrafiltration. Methanol has proved to be the most effective source of carbon. Pathogenic bacteria and bacteria which reduce sulphates have not been found in this culture.

3

Studies of groundwater in an agricultural area, Nile Delta, Egipt

88%

Fahim F. A., Mousa S. A., Aleem M. K. A.

Oceanological Studies

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1997

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vol. 26

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issue 2-3

127-137

EN

The groundwater underlying the Nile Delta area, Egypt, an agricultural area, was evaluated for drinking and domestic purposes. Twenty shallow groundwater samples were collected at different depths ranging from 10 to 50 m, and five surface water samples were collected from the two branches of the River Nile and one shallow ground water control sample. These samples were carefully analysed chemically and bacteriologically. The results may be helpful in identifying the reasons for the groundwater contamination in this area. The bacterial density was high in most of the shallow groundwater samples, from 3.3x103 cm-3 (minimum count) at well D4 (depth 45 m, Sers El Lyan El Menufiya), to 3x105 cm-3 (maximum count) at well D7 (depth 30m, Tanta , El Gharbiyah), and may be due to the lack of proper sanitation and the use of on-site subsurface sewage disposal. The dissolved solids increased northwards to an undesirable limit, owing to the intrusion of seawater. By contrast, the trace elements generally decreased northwards. According to WHO drinking water standards (WHO, 1993), only two elements - cadmium and lead - attained the maximum permissible limit. While copper, manganese and nickel were within the limit, iron was below it.

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1 Aleem M. K. A.

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1 Olnczuk-Neyman K.

1 Prejzner J.

1 Wasik E.

Application of biological processes in manganese elimination from ground water

Microbiological, sanitary and epidemiological analysis of the biological membrane and effluent of the packed-bed reactor in the biomembrane system applied to the removal of nitrates from ground water

Studies of groundwater in an agricultural area, Nile Delta, Egipt