Ozone for sludge volume reduction

in the news of WaterandWastewater.com

oxidizing the sludge with ozone before anaerobic decomposition

"The technique relies on the highly oxidising properties of ozone. Part of the return flow of the thickened sludge is extracted in the sewage station and treated with ozone in a reactor tank according to specific conditions. The weakened micro-organisms are then pumped back into the anaerobic basins, where they can be metabolised by the more powerful bacteria. The secret of success with this technique lies in ensuring the correct doses of ozone are applied. Jean Parmentier, of Air Liquide Europe, says that his company calls them 'homeopathic' doses of ozone."

Source: European Environmental Press (EEP)

Sludge of sodium caseinate plant wastewater - Water and Wastewater.com Help Forum

Water and Wastewater.com Help Forum - Sodium caseinate plant recyle water

if I understand correctly, as a result of caseinate manufacturing a wastewater is generated high in proteins (sludge), difficult to separate.
I expect pH adjustment by lime addition would make the sludge settle.

Biotechnology Selected for Treatment of PCP-Impacted Soil

Biotechnology Selected for Treatment of PCP-Impacted Soil

nice results, however, limited bioavailability or reduction of bioavailability may prevent it from working at some sites, especially in case of PAH contaminations or alike.

TRACING THE CENTRIFUGAL SEPARATION OF FINE-PARTICLE SLURRIES - LUM at AFS 2005

AFS-meeting

Effect of centrifugal acceleration, particle interaction and concentration

T. Sobisch*, D. Lerche, T. Detloff, L.U.M. GmbH, Berlin,

www.lum-gmbh.com, info@lum-gmbh.de

M. Beiser, A. Erk, Institut für Mechanische Verfahrenstechnik und Mechanik,

Universität Karlsruhe (TH)

Conclusion

Multisample analytical batch centrifugation with optical detection proved to be a versatile tool for the characterization of the separation of fine grained materials. This holds for information on the type of sedimentation behaviour (free sedimentation of individual particles, hindered settling, zone settling), on the sedimentation velocity distribution inside the centrate and on the packing, compression and elasticity behaviour, on the nature of particle interactions and the degree of flocculation as well.

The investigations were complemented by centrifugation with manometric detection and with a disk centrifuge. The first allows a high resolution in the determination of velocity distributions up to high values of velocities in the order of several mm/seconds and high particle concentrations, the second represents a cross section of a solid bowl centrifuge and allows to study the movement of the phase boundary after abruptly discharging a sample into the spinning centrifuge.

The results of multisample analytical centrifugation with optical detection were in good agreement with the complementary methods (velocity distribution determined by manometric detection and average packing density obtained during compression in the disk centrifuge).

AFS 2005 Annual Conference & Exposition

Conference 2005 - AFS Annual

'AFS 2005 Spring Conference & Exposition, April 10-14, 2005 in Atlanta, GA. Interest of the combined event has been widespread.

....
Interest in the AFS 2005 Conference and Exposition has been strong as the AFS co-located partner AIChE has a membership of 46,000, sixty percent being specifiers, buyers and users of filters and separation equipment. If you feel there are findings or new technology you want to tell the industry about next spring…now is the time to make your intentions know. .........

Contribution
Tracing the centrifugal separation of fine-particle slurries - effect of centrifugal acceleration, particle interaction and concentration

clean water from surface water by UV-Peroxyde without chlorine

PWN online

'drinking water facility ...............applies a new, innovative water treatment process. The process combines UV light and hydrogen peroxide to produce reliable drinking water from surface water.
.............PWN is the first drinking water treatment facility successfully applying the UV-peroxide technology on a large scale.
...............It is a cost-effective method, since two treatment steps are integrated: disinfection and degradation of organic micro-contaminants.
............An important advantage of this technology is that chlorine is no longer needed primary for disinfection at PWN. This eliminates the environmental and safety risks associated with the use of chlorine. However, conventional UV treatment uses relatively much energy. Therefore, PWN has taken all possible measures to reduce energy consumption to the absolute minimum. In addition, PWN uses "green power" for the process, and surplus heat is re-used for heating.
.............'

Elevated conductivity-poor settling? - Water and Wastewater.com Help Forum

Water and Wastewater.com Help Forum - Elevated conductivity-poor settling??

Normally the higher the conductivity the higher the destabilization of colloidal particles, i.e. aggregation and settling is enhanced. The same phenomenon occurs in estuaries when silty water mixes with salt water. This relates to the compression of the electric double layer with increasing electrolyte concentration, the repulsion is reduced.

sludge volume index and stirred sludge volume index - Water and Wastewater.com Help Forum

Water and Wastewater.com Help Forum - SVI vs. SSVI

Note, that besides a gas hold up differences between the two sludge volume index values might be due to the break-up of larger agglomerates during stirring.

Defoaming Agents Affecting Dissolved Oxygen - from the Water and Wastewater.com Help Forum

Water and Wastewater.com Help Forum - Defoaming Agents Affecting Dissolved Oxygen

there is a simple relation between oxygen transfer and presence of 'antifoam'.
The antifoam agents act by their high surface activity, they displace other surface active substances, which produce stable foam, while these produce unstable foams. They will block every newly generated gas-liquid interface. Therefore, aeration and addition of antifoam should not be applied in a single step.

Rapid characterization of emulsions for emulsifier selection, quality control and evaluation of stability using multisample analytical centrifugation

SCI/RSC/SCS conference Cosmetics and Colloids, London 15 February 2005

read the article

Rapid characterization of emulsions for emulsifier selection, quality control and evaluation of stability using multisample analytical centrifugation

online at www.soci.org

Abstract

Selection of emulsifiers and evaluation of emulsion stability is a frequent task. This relates to practical issues like formulation of emulsions, optimization of manufacturing, quality control, and shelf life prediction.

A multisample technique based on analytical centrifugation is presented which allows for an accelerated study of creaming and of separation of oil and water phases. Not only information on the extent of phase separation is provided but also the kinetics are directly measured in-situ. The latter is of great practical importance for estimation of shelf life and in relation to the engineering of separation processes.

Results of investigations on emulsion stability behaviour as function of polarity and composition of nonionic emulsifiers, polarity of the oil phase, preparation conditions and of temperature are presented.

The investigations revealed that the method applied is very suitable for screening purposes, optimization of emulsion manufacturing and that time of investigation and centrifugal acceleration can be adapted to avoid conditions were centrifugal forces are the determining factor for phase separation.

To trace slow destabilizing processes a combination with common accelerated aging tests is the method of choice.

Keywords: emulsion stability, analytical centrifugation, emulsion preparation, emulsifier and demulsifier selection, oil-in-water and water-in-oil-emulsions, shelf stability of cosmetic creams

Ceramic industry wastewater treatment - Water and Wastewater.com Help Forum

Water and Wastewater.com Help Forum - Ceramic industry wastewater treatment?

For removal of clays dual flocculation (first addition of low amounts of an anionic polyelectrolyte then a cationic polymer) is usually very efficient. Likely, by this process you would be able to remove most of the BOD/COD (adsorbed to the clay).

Interference of silicone oil emulsions in ultrafiltration system - Water and Wastewater.com Help Forum

Water and Wastewater.com Help Forum - Silicone in Ultrafiltration System

solution - more polar membranes, appropriate demulsifier system, ECP?