1. Filtration concept
The turned on carbon filter is the process of intercepting the put on hold toxins in the water, and the intercepted suspended issue fills up the voids in between the triggered carbons. The pore size as well as porosity of the filter layer increase with the increase of the particle dimension of the turned on carbon product. That is, the coarser the particle size of triggered carbon, the larger the room that can accommodate suspended solids. It is characterized by boosted filtering capability, increased dirt-holding ability, and also raised sewage interception ability. At the same time, the larger the pores of the turned on carbon filter layer, the much deeper the suspended solids in the water can be transported to the following layer of activated carbon filter layer. Under the condition of enough safety thickness, the suspended solids can be a lot more entraped, making the middle and also lower filter layers a lot more effective. The interception result can be played well, and also the sewage interception capacity of the system will increase.
Purely talking, the capacity of triggered carbon to hold put on hold solids comes from the area given by activated carbon. When the flow rate is low, the filtration capability of the device mainly comes from the sieving effect of triggered carbon, as well as when the flow price is fast, the filtering capability comes from the adsorption on the surface of turned on carbon fragments. The more powerful the adhesion.
2. Adsorption concept
According to the difference in the force between turned on carbon molecules as well as toxin molecules during the adsorption procedure, adsorption can be separated into 2 classifications: physical adsorption as well as chemical adsorption (also known as active adsorption). In the adsorption procedure, when the force between triggered carbon particles and also toxin molecules is van der Waals pressure (or electrostatic attraction), it is called physical adsorption; when the force in between activated carbon molecules and pollutant particles is a chemical bond, it is called chemical adsorption. The adsorption toughness of physical adsorption is mainly pertaining to the physical residential properties of triggered carbon, as well as primarily has nothing to do with the chemical residential properties of activated carbon. Since the van der Waals force is weak, it has little result on the framework of toxin particles. This force is the same as the intermolecular cohesion, so physical adsorption can be compared to pile sensation. The chemical properties of the pollutants remain unchanged throughout physical adsorption.
Due to the strong chemical bond, it has a terrific impact on the framework of toxin particles, so chemical adsorption can be considered a chain reaction, which is the outcome of the chemical interaction between toxins and triggered carbon. Chemisorption generally involves electron pair sharing or electron transfer, as opposed to simple perturbation or weak polarization, as well as is a permanent chemical reaction process. The fundamental distinction between physisorption as well as chemisorption is the force that produces the adsorption bond.
The adsorption procedure is the process in which toxin molecules are adsorbed to the strong surface area, as well as the complimentary energy of the molecules will be minimized. Therefore, the adsorption procedure is an exothermic procedure, as well as the heat released is called the adsorption heat of the toxin on the strong surface area. As a result of the different forces of physical adsorption and chemical adsorption, they show certain differences in adsorption heat, adsorption price, adsorption activation energy, adsorption temperature level, selectivity, number of adsorption layers, as well as adsorption spectrum.
Activated carbon adsorption innovation has actually been used in the refining as well as decolorization of pharmaceutical, chemical and also food markets for several years in China. It began to be used in commercial wastewater treatment in the 1970s. Production method reveals that activated carbon has superb adsorption to trace organic pollutants in water, and it has a great adsorption result on commercial wastewater such as textile printing and dyeing, dye chemical sector, food handling as well as organic chemical sector. Generally, it has a special capacity to get rid of organic matter represented by detailed indicators such as BOD as well as COD in wastewater, such as synthetic dyes, surfactants, phenols, benzenes, organic chlorine, chemicals and petrochemical items. Consequently, activated carbon adsorption has progressively become one of the main methods for secondary or tertiary treatment of commercial wastewater.
Adsorption is the slow-acting process by which one substance affixes to the surface of another. Adsorption is an interfacial sensation, which belongs to adjustments in surface tension and surface area power. There are two driving pressures that cause adsorption, one is the repulsion of solvent water to hydrophobic substances, and also the various other is the affinity as well as destination of solids to solutes. Adsorption in wastewater therapy is primarily the result of the combined activity of these two forces. The specific surface and also pore structure of turned on carbon straight influence its adsorption capability. When selecting activated carbon, it should be determined with experiments according to the water quality of wastewater. For printing as well as dyeing wastewater, it is recommended to pick carbon varieties with strong transition pores. On top of that, the ash web content also has an impact, the smaller the ash material, the far better the adsorption performance; the more detailed the size of the adsorbate particle to the carbon pore size, the much easier it is to be adsorbed; the concentration of the adsorbate additionally impacts the adsorption capability of activated carbon. Within a specific focus array, the adsorption ability raises with the rise of the adsorbate concentration. Furthermore, water temperature level as well as pH also contribute. The adsorption capability decreased with the rise of water temperature.