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• W2059689085 abstract "The effect of surface properties and the effects of several process conditions, e.g. loading rate, ionic strength and the presence of polymers, on the degree of aggregation of sulphur particles were studied. Sulphur is formed under oxygen-limiting circumstances during the partial oxidation of sulphide by a mixed culture of thiobacillus-like bacteria. Since the freshly excreted particles are in a colloidal state, with a diameter of approximately 100 nm, their aggregation is a prerequisite in order to obtain a satisfactory sedimentation. Titration experiments revealed that the negative sulphur surface charge is determined by the presence of multiple functional groups. Attention was also paid to the effect of the chain length, hydrophilicity and charge of a number of dissolved polymers on the degree of sulphur aggregation. The degree of polymer adsorption on the sulphur surface mainly depends on the hydrophobicity and charge of the polymer. Since the charge of biologically produced sulphur is negative at pH 8.0, a highly charged cationic polymer like QN-HEC inhibits the sulphur aggregation. For Perfectamyl and carboxymethylcellulose no clear effect was measured. Particularly for long-chain polymers, a distinct negative effect on the aggregation was found. Steric hindrance, apparently, is an important factor in the aggregation process. Upon increasing the sulphide loading rate, larger sulphur aggregates were formed while the opposite trend was observed for increasing salt concentrations. In practice, therefore, a sulphide-oxidizing bioreactor should be operated at high loading rates to enhance the settleability of the sulphur sludge." @default.
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• W2059689085 date "1996-03-01" @default.
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• W2059689085 title "Surface characteristics and aggregation of microbiologically produced sulphur particles in relation to the process conditions" @default.
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• W2059689085 doi "https://doi.org/10.1016/0927-7765(95)01246-x" @default.
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