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Hexadecane mineralization in oxygen-controlled sediment-seawater cultivations with autochthonous microorganisms. Paper-7369594. Under anoxic conditions, no hexadecane degradation occurred within 190 h. Paper-7369594.
A significant influence on the degradation process was detected only with DOTs below 1%.
The amount of hexadecane degraded was constant, with an average value of 86% of the initially applied amount. Paper-7369594.
When the DOT was reduced from 80% to 5%, no dependence of the investigated parameters on the oxygen concentration was found.
The degree of mineralization and the amount of degraded hexadecane decreased, whereas the degradation rate was still unaffected. Paper-7369594.
The degradation rate was constant even down to 1% DOT, with an average value of 0.15 mg of hexadecane per g of sediment per h ( 16.2 mg liter-1 h-1). Paper-7369594.
With a fermentor system, it was possible to adjust and regulate different oxic conditions (DOTs between 0.4 and 80% of oxygen saturation) as well as anoxia.
Laboratory studies investigated the influence of dissolved oxygen tension (DOT) on microbial degradation of hexadecane in cultures with sediment-seawater suspensions. Paper-7369594.
The effects of DOT reduction on the amount and rate of hexadecane degraded and on the degree of mineralization and on the production of biomass were investigated. Paper-7369594.
The mean degree of mineralization was 70% of the initially applied hexadecane, and biomass production reached a value of about 1.5 g per g of hexadecane consumed. Paper-7369594.
The fact that the hexadecane biodegradation rate was constant down to at least 0.04% DOT shows that the actual oxygen concentration is of minor importance as long as the oxygen supply is high enough to guarantee the oxygen-dependent degradation step. Paper-7369594.
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