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By L. Klein (auth.), P. L’Hermite, H. Ott (eds.)

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Additional resources for Characterization, Treatment and Use of Sewage Sludge: Proceedings of the Second European Symposium held in Vienna, October 21–23, 1980

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Methods for the analysis of surfactants will also be discussed. -40 - Despite such progress, the number of standardized methods of analysis has remained a rather limited one and is not at all corresponding to the requirements of practice. Although the manuals, handbooks , and other publications in this field provide a number of other rules and guidance in matters of sludge investigation, these are frequently of a quite general nature and only rarely meet the requirements of binding standards. g.

Parameter Measurement Sludge volume Volume of settled sludge after 30 min. in graduated sylinder. (ml sludge/l sample) Sludge Volume Index (SVI) Sludge Volume/Suspended Solids concentration (ml/g) Stirred SVI (SSVI) SVI in a slowly stirred graduated sylinder (ml/g) Low speed centrifugation Sludge blanket settling velocity in a field of 10-100 G Ultimate Solids Dry Solids concentration after settling or centrifugation Flotation tests Specific air requirement in lab thickener Dry solids achieved Flux of thickener Of these the SVI (and lately in Britain the SSVI) have found wid spread use.

The origin of the sludges seems to influence the shape of the thermogrammes, but some of the characteristics of the compost sample thermogrammes could also be found in the thermogrammes of the aerobic stabil ized sludge samples. -44 - Introduction Sludge stabi 1 ization processes have been in use for many decades, but there are still not any generally accepted methods for the eharacterizat" I of sludge stabil ity. The impl leation of this situation is that the design and operation of the sludge stabi!

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