F/H seepage basin groundwater influent, effluent, precipitated sludge characterization task technical plan

In order to improve sewage sludge characterization for both dewatering and agricultural spreading, we have studied their electrical and rheological properties. On the one hand, electrical measurements give a picture of the microstructure of the material (charges, particles mobility), whereas on the other hand, rheological experiments describe its macrostructure (consistency). The interactions of the matter are the link between them. Our results showed that sludge becomes more conductive when its dry content (for a defined composition) or the temperature increases, and also during aging. In parallel its apparent viscosity increases with the dry content but decreases with the temperature or during aging. In each case a clear correlation was found between electrical and rheological parameters. This relationship clearly depends on sludge composition, and also on parameters such as the temperature, the observation frequency, the velocity range in the case of relaxation experiments. Finally, those types of experiments can be correlated to improve the comprehension of sludge structure and consistency characterization.

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A novel approach to hydrogen recovery, storage and transport: Task 1, Technical plan

10.2172/6130786 ◽

1988 ◽

Author(s):

M. C. Fowler

Keyword(s):

Hydrogen Recovery ◽

Novel Approach ◽

Technical Plan

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Design and safety basis sludge characterization from exposure-adjusted radioisotopic source terms for N reactor fuel stored at K-East and K-West basins

10.2172/807472 ◽

2001 ◽

Author(s):

K N SCHWINKENDORF

Keyword(s):

Reactor Fuel ◽

Source Terms ◽

Sludge Characterization

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The Use of Rheology for Sludge Characterization

Water Science & Technology ◽

10.2166/wst.1982.0120 ◽

1982 ◽

Vol 14 (6-7) ◽

pp. 475-489 ◽

Cited By ~ 35

Author(s):

H W Campbell ◽

P J Crescuolo

Keyword(s):

Particle Size ◽

Sewage Sludge ◽

Test Procedures ◽

Particle Size Reduction ◽

Rotational Viscometer ◽

Polymer Addition ◽

Rheological Measurements ◽

Acceleration Rate ◽

Sludge Characterization ◽

Potential Use

Rheological measurements were conducted on a variety of anaerobically digested sewage sludges to evaluate the potential use of rheology in describing the effects of chemical conditioning on the physical characteristics of sludges. The objectives of the study were to evaluate the influence of the method of chemical conditioning on rheological measurements; to determine the response of the viscometer system to changes in the instrument variables; and to evaluate interrelationships between rheology and other physical properties. All rheological measurements were made using a coaxial rotational viscometer. Evaluation of a variety of test procedures identified that both the method of adding chemical conditioners, and the acceleration rate of the rotational viscometer, could significantly alter the shape of the rheograms. A suggested methodology was identified and selected samples were analyzed in triplicate to test the reproducibility of the procedures. Existing mathematical models do not adequately describe the variety of flow behaviour patterns observed with sewage sludge. The concepts of yield stress and apparent viscosity also have limited value due to problems of definition and calculation. A parameter termed the “instantaneous viscosity”, defined as the derivative of the flow curve, is suggested as being more suitable for describing sludge behaviour. The relationships between chemical conditioning, particle size distribution and applied shear were explored. As polymer addition increased, the sludge particles became more susceptible to shear breakup. The extent of particle size reduction was a function of the rate of shear and the time during which the shear was maintained.

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