Detailed introduction of activated carbon filter

Activated carbon is made of nut shell and wood chips as raw materials and refined by special production process. It has the characteristics of large specific surface area, strong adsorption capacity, high purity, fast filtration speed and stable quality. Activated carbon-biological method is an activated sludge process that combines activated carbon adsorption and biological oxidation. After activated carbon is added to the aeration tank, it can strengthen the purification function of activated sludge, improve the removal effect of organic matter, and improve the effluent quality. Wang Yanxia et al. have shown that the activated carbon surface with adsorption capacity is more likely to form biofilms than the general filler surface, and the activated carbon greatly improves the biological properties of the filler surface. Lian Jianjun et al. selected 5 fillers with different ratios of activated carbon and a reference filler without activated carbon, respectively, from the aspects of hydrophilicity, COD and NH4+-N removal, microbial biomass and microbial species. A comparative study was carried out under the same operating conditions. The experimental results show that the fillers containing activated carbon have obvious advantages over the fillers without activated carbon in terms of hydrophilic properties, film forming speed, and biomass concentration. Among the fillers containing activated carbon, 25% of the fillers hang film quickly, the treatment effect is stable, and it is less affected by the external environment. (2) Performance parameters Other commonly used filter elements: wire wound filter element, pleated filter element, PP meltblown filter element and other coal-based columnar activated carbon Main technical parameters: iodine value ≥ 850mg/g; strength ≥ 90%; specific surface area 500 ~ 900m2/g ; Moisture≤10%; Filling density 0.45~0.55g/cm3. (3) The organic matter that is difficult to be removed in the biological treatment of wastewater can be removed by the strong adsorption of activated carbon, and the adsorption is beneficial to prolong the time of the biological degradation reaction of the adsorbed organic matter. Activated carbon-biological treatment of wastewater can improve the comprehensive treatment effect of wastewater, and the operating cost is low. The activated carbon-biological method can be used for the treatment of pesticide wastewater, synthetic chemical wastewater, and pharmaceutical intermediate wastewater, and can effectively remove organic matter, NH3-N and other harmful substances in wastewater. Chitra et al. found that the use of activated carbon in secondary biological wastewater treatment can greatly improve the removal effect of dissolved organic matter in wastewater. The purification mechanism is: a. The large surface area and adsorption of activated carbon concentrate organic matter and dissolved oxygen on the surface and surrounding of activated carbon. , creating a good microenvironment for the metabolic activities of microorganisms and accelerating the degradation process of organic matter; b. After the organic matter that cannot be biodegraded is usually adsorbed by activated carbon, the contact time with microorganisms increases. In traditional activated sludge The contact time in the method is the hydraulic retention time, while in the activated sludge method, once it is adsorbed, the contact time is equivalent to the sludge age of the system. Longer contact time will inevitably provide more opportunities for biodegradation.

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