Paper mill sludge, the solid particles of colloidal particles have a complex structure, with strong water and force. Can be divided into the water in the sludge in the form of interstitial water, capillary water, the surface adsorbed water and water within four.
Surface adsorbed water adsorbed in the surface tension of water, all colloidal particles with the charge of the same nature, mutually exclusive, and hinder the aggregation of particles, grow up, and maintain a steady state, and thus the surface adsorbed water with ordinary condensed or dehydration remove more difficult. Only by adding a coagulation electrolyte, so that colloidal particles of charge to get in and after the particles were unstable, adhesion together, and finally settling down. Particles increases the specific surface area decreases, the surface tension decreases, the surface adsorbed water also will be out of from the colloidal particles. Paper mill sludge colloidal particles are generally negatively charged, and therefore should be added to the electrolytic ions with positive charge.
Interstitial water, the size of sludge particles surrounded by free water, it does not combine directly with the solid, and thus easily separated only need to concentrate the pool to control the appropriate residence time, the use of gravity, will be able to be separated. Pore water is generally accounted for 65% of the total water content in the sludge -85%, the main target of this part of the water is sludge thickening.
Paper sludge by a high concentration of small solid particles, solid particles come into contact with the surface, due to capillary forces the role of the formation of capillary bound water, capillary bound water accounted for about 15% of the total water content in the sludge -25%. Due to the strong binding force between capillary water and sludge particles, gravity can not be capillary bound water separation requires the use of high mechanical forces and energy, such as vacuum filtration, pressure filtration and centrifugal separation to remove this part of the water.
The Zhucheng innovative Chinese Environmental Protection Technology Co., Ltd. production of vacuum filter sludge dewatering has a significant effect.
Surface adsorbed water adsorbed in the surface tension of water, all colloidal particles with the charge of the same nature, mutually exclusive, and hinder the aggregation of particles, grow up, and maintain a steady state, and thus the surface adsorbed water with ordinary condensed or dehydration remove more difficult. Only by adding a coagulation electrolyte, so that colloidal particles of charge to get in and after the particles were unstable, adhesion together, and finally settling down. Particles increases the specific surface area decreases, the surface tension decreases, the surface adsorbed water also will be out of from the colloidal particles. Paper mill sludge colloidal particles are generally negatively charged, and therefore should be added to the electrolytic ions with positive charge.
Interstitial water, the size of sludge particles surrounded by free water, it does not combine directly with the solid, and thus easily separated only need to concentrate the pool to control the appropriate residence time, the use of gravity, will be able to be separated. Pore water is generally accounted for 65% of the total water content in the sludge -85%, the main target of this part of the water is sludge thickening.
Paper sludge by a high concentration of small solid particles, solid particles come into contact with the surface, due to capillary forces the role of the formation of capillary bound water, capillary bound water accounted for about 15% of the total water content in the sludge -25%. Due to the strong binding force between capillary water and sludge particles, gravity can not be capillary bound water separation requires the use of high mechanical forces and energy, such as vacuum filtration, pressure filtration and centrifugal separation to remove this part of the water.
The Zhucheng innovative Chinese Environmental Protection Technology Co., Ltd. production of vacuum filter sludge dewatering has a significant effect.
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