PRAESTOL 857 BS is used mainly for waste water purification, as well as for thickening and dewatering of municipal and industrial sewage sludges (centrifuges, screen belt pres-ses, chamber filter presses). The product is specially suitable for applications where the formed flocs are subject to high shear forces.
it can be replaced by Chinafloc C5008 totally
The mode of action of cationic PRAESTOL products is based essentially on ion exchange between the electrical charges along the polymer chain present in aqueous solution and the surface charges on the suspended solid particles. The particle surfaces are destabilized, thus bringing about coagulation or flocculation.
PRAESTOL 857 BS is used as a dilute solution (approx. 0.1 %). For preparation of stock solutions (approx. 0.5 %) the original product is added to water with uniform stirring. After a dissolving period of approx. 60 minutes (at a temperature of ³ 15 °C), the solution is mature and is thus ready for use. Owing to the very variable properties of the sludges to be dewatered, the required addition quantities for a particular application can only be determined by carrying out laboratory tests and industrial trials.
Experience has shown that in mechanical sludge dewatering the quantities required in order to achieve a high machine throughput and discharge water free of settleable materials is between 2 and 6 kg polymer per ton of dry solids in the sludge. When used as a sedimentation accelerator or clarifying agent (in static sedimentation processes), only a few grams of polymer per cubic metre of slurry to be clarified are required.
Working Safety and Accident Prevention
In case of spillage/leakage:
Caution: Severe skidding hazard in combination with water and moisture. Keep public away from the danger area! Completely remove/reload the dry product. Completely remove and store moist/liquid product with sand or binders. Repeat this procedure as required. Remove minor
residue carefully from the road by spraying with a strong water jet.
Safety Measures: Prevent dust development in case of dry product! Avoid contact with the eyes! Avoid extended contact with the skin! Rinse off the product after handling/touching!
High molecular flocculating agents, such as PRAESTOL 857 BS are all basically sensitive to the effect of moisture, for example in the form of condensation water, water spray or splashes and
Water hazard class: 2 (self classification)
atmospheric moisture. Contact with water (drops) can cause localized lump formation. The product must therefore be stored in dry, closed containers and protected from moisture.
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