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In water pretreatment system, activated carbon filter can filter adsorption before class can't remove the level of residual chlorine in order to prevent the reverse osmosis membrane by the oxidation degradation, as well as adsorption was magnitude leakage of small molecule organic pollutants, such as peculiar smell, colloid and pigment, heavy metal ions in water have more apparent, such as adsorption removal effect, also have the effect that reduce COD.
SDI value of RO inlet water can be further reduced to ensure SDI<5 and TOC<2.Oppm.
Activated carbon filter: high quality fruit shell activated carbon has many micro pores and large specific surface area (1000m2/g), so it has strong physical adsorption capacity.Activated carbon filter is used as filter material to remove residual chlorine, colloidal particles, organic matter, chromaticity and odor.
The replacement period of filter material is about 0.5 to 1.0 years.
According to the source water quality characteristics, different backwashing cycles are set and different backwashing methods are adopted.
This scheme adopts the method of controlling the backwash flow velocity and strength.
The activated carbon filter pressure vessel is a pressure vessel filled with activated carbon.
Activated carbon filter work is done through the charcoal bed.
Activated carbon particles composed of carbon bed have many micropores and large specific surface area, with strong physical adsorption capacity.
The water passes through the charcoal bed, and the organic pollutants in the water are effectively absorbed by the activated carbon.
In addition, there are some oxygen-containing functional groups on the amorphous part of the surface of activated carbon, so that organic pollutants in the water passing through the carbon bed can be effectively adsorbed by activated carbon.
Activated carbon filter is a kind of commonly used water treatment equipment. As the pretreatment of water treatment and desalination system, it can effectively guarantee the service life of the equipment of the later stage, improve the effluent water quality, prevent pollution, especially prevent the free residual oxygen poisoning pollution of the reverse osmosis membrane and ion exchange resin of the later stage.
The main factors that affect the adsorption effect and service life of activated carbon filter are: the type and concentration of pollutants, the residence time of airflow in filter material, air temperature and humidity.
The actual selection, according to the type of pollutants, concentration and treatment air volume and other conditions, determine the type of filter and activated carbon.
The upper and lower reaches of the activated carbon filter should have good dust removal filters, and the efficiency specification should not be lower than F7.
The upstream filter prevents dust from blocking the activated carbon material;
The downstream filter stops the carbon itself from dusting.
Activated carbon filter is the use of granular activated carbon to further remove the remaining residual chlorine, organic matter, suspended matter impurities in the water from the mechanical filter, to provide good conditions for the subsequent reverse osmosis treatment.
Activated carbon filter mainly USES activated carbon organic flocs with high carbon content, high molecular weight and large specific surface area for physical adsorption of impurities in water to meet the water quality requirements.
At the same time, chlorine (hypochlorous acid) adsorbed on the surface of activated carbon reacts on the surface of carbon and is reduced to chloride ions, so as to effectively remove chlorine and ensure that the residual chlorine in the effluent is less than 0.1 PPM, meeting the operating conditions of RO membrane.
With the passage of time, the interception between the pores and particles of activated carbon gradually increases, so that the pressure difference between before and after the filter increases, until the failure.
Under normal circumstances, according to the pressure difference before and after the filter, most of the intercepts adsorbed in the pores of activated carbon are removed and carried away by the flow by using the reverse flow reverse washing filter material to restore the adsorption function.
When the activated carbon reaches the saturation adsorption capacity and completely fails, the activated carbon should be regenerated or replaced to meet the engineering requirements.