Publication

Polyelectrolytic flocculant for accelerating solid sedimentation from coal-containing wastewater

Jutta Christine Wandrey
1985
Patents

Abstract

Sedimentation of solids is accelerated and complete, resulting in a high-quality effluent, when a 0.1% soln. of equal parts of poly(dimethyl-diallyl-ammonium chloride) cationic flocculant and a nonionic or anionic polyacrylamide is used at a rate of 0.25-4 mL/L wastewater. Thus, briquet manufg. wastewater contg. 5-10 g solids/L was treated with the above mixt. at 0.5 mL/L under turbulent mixing conditions, flocculanted for 15 min and allowed to settle for 30 min, forming a brown coal sludge having >100 g solids/L. The effluent contained

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https://infoscience.epfl.ch/entities/publication/9fbb81e8-4569-42a6-8ca7-c5342018f547

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Jutta Christine Wandrey
1985
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/9fbb81e8-4569-42a6-8ca7-c5342018f547

About this result

Related concepts (32)

Flocculation

In colloidal chemistry, flocculation is a process by which colloidal particles come out of suspension to sediment in the form of floc or flake, either spontaneously or due to the addition of a clarifying agent. The action differs from precipitation in that, prior to flocculation, colloids are merely suspended, under the form of a stable dispersion (where the internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation) and are not truly dissolved in solution.

Coal

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is a type of fossil fuel, formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. Vast deposits of coal originate in former wetlands called coal forests that covered much of the Earth's tropical land areas during the late Carboniferous (Pennsylvanian) and Permian times.

Industrial wastewater treatment

Industrial wastewater treatment describes the processes used for treating wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater (or effluent) may be reused or released to a sanitary sewer or to a surface water in the environment. Some industrial facilities generate wastewater that can be treated in sewage treatment plants.

Related publications (6)

Polyelectrolytic flocculant for accelerating solid sedimentation from coal-containing wastewater

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