Pulp fibers have a strong tendency to form flocs in water suspensions, which may cause their undesirable distribution in the paper sheets. This flocculation can be controlled by adding, e.g., an anionic high molecular weight polyelectrolyte in the fiber suspension. The objective of this study was to investigate the effect of anionic polyelectrolytes on deflocculation kinetics, dewatering, and r...

The presented research concerned the phenomenon of polyelectrolyte changes resulting from modification by applying ultrasonic field. main aim this was to determine activation degree macromolecular chemical compound and its effect on sewage sludge subjected conditioning followed dewatering. overall goal investigate potential way reducing dosage compounds prior conditioning. samples were sonicate...

The current average daily gas production of single coalbed methane (CBM) wells in China is less than 1,300 m3. low rate CBM dramatically limits the sustainable development industry China. To promote development, three universal geological factors, i.e., sources, channels, and driving force are analyzed, considering various complicated conditions reservoirs Additionally, we find that growth prov...

Polychlorinated biphenyls (PCBs) were heavily used for over fifty years in industrial applications, primarily inside capacitors and transformers. Over twenty years after their phase-out in the United States PCBs are still one of the most widespread contaminants in the environment. PCBs are stable compounds with low aqueous solubility and vapor pressure. These unique properties led to the extens...

The ability to predict the performance of large-scale processes is central to the rapid development of successful operations at the pilot and industrial scale. In this article, we examine the operation, at laboratory scale, of precipitation reactors and centrifuges for protein precipitate recovery and dewatering and how they might best mimic large-scale reactors and centrifuges, in this case, a...

The aim of this investigation was to find out how properties of a flocculation agent and flocculation kinetics affect the morphology of fibre flocs and how dewatering of a fibre suspension may be attributed to floc morphology. Fibre flocculation, analysed in terms of floc size, mass fractal dimension, floc strength, and the kinetic constant of flocculation, was measured with a digital image ana...

An experimental study of the dewatering wood-pulp fiber suspensions by uniaxial compression is presented, to rationalize their dynamics within a two-phase framework. Twenty-seven pulp are examined, encompassing materials with different origins, preparation methodologies, and secondary treatments. For each suspension in this library, network permeability compressive yield stress calibrated at lo...