The activated carbon adsorption method for the treatment of aniline wastewater has been widely used. Through the aniline pollution and powdered activated carbon emergency treatment test, we also summarized the main points and precautions of activated carbon treatment of aniline pollution process, as follows:
1. Select wood powder activated carbon with large specific surface area
The removal rate of aniline from wood charcoal is higher than that of coal char. It indicates that different carbon species have great influence on the adsorption of aniline on powdered activated carbon. Among them, wood powder activated carbon has stable effect on aniline removal and is the best carbon species. Aniline is a small molecule organic compound. The adsorption mainly occurs on the surface of the micropores of activated carbon, and the wood charcoal with developed specific surface area has good adsorption effect on aniline. The specific surface area of ​​coal charcoal is smaller than that of wood charcoal, so the adsorption effect is relatively poor. In the emergency treatment of aniline water pollution, according to the actual situation, it is preferred to select activated carbon with a large specific surface area for dosing to improve the treatment efficiency.
2, the activated carbon particle size should be 200 ~ 300 mesh
Powdered activated carbon with different particle sizes has significant differences in the removal rate of aniline. With the decrease of the particle size of powdered activated carbon, the removal rate of aniline by activated carbon showed a significant upward trend. This is mainly because the smaller the particle size of the coconut shell activated carbon, the larger the surface area, the faster the mass transfer rate, and the better the adsorption effect. However, in the emergency treatment process, the influence of particle size on the subsequent process should also be considered, especially when the particle size of the powdered activated carbon is more than 300 mesh, it is difficult to precipitate and easily penetrate the filter tank, thereby affecting the effluent water quality. Therefore, it is preferred to select the granular activated carbon to have a particle size of about 300 mesh.
3, the lower the concentration of carbon paste, the better
Self-agglomeration exists between powdered activated carbon particles. The higher the concentration of carbon slurry, the greater the probability of contact between the powdered activated carbon particles, and the self-agglomeration phenomenon, which reduces the effective specific surface area of ​​the powdered activated carbon, thereby reducing the adsorption performance of the activated carbon. For this reason, in the emergency treatment process, the lower the concentration of the added carbon slurry, the better, in order to save investment while making full use of the adsorption performance of the powdered activated carbon.
4, the solution pH is not less than 5
In the adsorption process of powdered activated carbon, the pH of the solution will have an effect on the adsorbate and the adsorbent. For details, see the main factors affecting the adsorption of activated carbon. The presence of aniline in water has a great influence on its adsorption by activated carbon. During the emergency treatment process, the pH of the adsorption environment of the activated carbon to aniline should be kept at least 5, so that the adsorption performance of activated carbon on aniline can be fully exerted.
5, the timing of the addition of carbon paste depends on the front
The order of flocculant addition directly determines the length of adsorption time of powdered activated carbon. With the post-shift of carbon slurry, the removal rate of aniline shows a downward trend, indicating that the best order for adsorption of aniline is to add carbon slurry first. Then, the flocculant is added, and the earlier the addition time of the carbon slurry, the better the treatment effect on the aniline.
High purity activated carbon and ultra high purity activated carbon:
Have you paid attention to the purity of activated carbon? High purity food-grade decolorization special activated carbon is more pure. It is inevitable that the activated carbon contains some impurities from the raw materials, or when chemical activation is used, impurities (such as phosphoric acid) are introduced by using an activator. The most important considerations for impurities in activated carbon are those that may be dissolved in the solvent of the product and thus enter the product to be purified.
High purity activated carbon
High-purity activated carbon has a very low concentration of soluble impurities, and the amount of activated carbon added is negligible compared to the amount of product it needs to handle. All high-purity activated carbon products produced by Hongyu and activated carbon for Hongyu food-grade beverages can meet the requirements of food chemical regulations. In some cases, impurities only affect the pH of the product being processed. In this case, some kind of activated carbon can be used to change the pH of the product. Granular activated carbon will have a certain impact on the pH of the product at the beginning of use, but with the continuous use of activated carbon, this effect will gradually weaken.
Ultra-purity activated carbon
The ultra-pure activated carbon products of Hongyu Activated Carbon Plant, the trace level of impurities, due to the strict selection of raw materials and post-treatment, so that the content of impurities is further weakened, the impurity level meets strict technical requirements, and far exceeds the requirements of the US Food Chemical Code. This makes Hongyu activated carbon meet the higher requirements, so the high-quality activated carbon produced by our company is in great demand. The shell is made of activated carbon
Application of regenerated activated carbon:
Activated carbon has been widely used in environmental protection/industrial and civil applications. Activated carbon adsorption is a physical process. High-temperature steam is used to remove the internal impurities, which restores the original activity and has obvious economic benefits. In the industry, it is widely used in the field of wastewater tertiary treatment. If the activated carbon after adsorption cannot be recovered, the treatment cost per ton of wastewater will increase by 0.83 to 0.90 yuan, and it will cause secondary pollution to the environment. The secondary treated wastewater first enters the mixing tank and then enters the flocculation tank. Under the action of ferric chloride, calcium hydroxide and polymer flocculant, the suspended impurity particles in the wastewater are precipitated, and the upper layer of clarified water is pumped. After being sent to the sand filter for filtration, it is pumped into the activated carbon adsorption tower. As the adsorption process progresses, the adsorption capacity of activated carbon will gradually decrease, so it is necessary to periodically remove the activated carbon from the suction.
The bottom of the tower is placed in a failed carbon tank. The spent activated carbon is pickled with dilute sulfuric acid in the pickling tower and then sent to a dehydrator for dehydration to 40%-50%. The dehydrated spent carbon enters the hopper and the feeding vessel. The fluidized bed regeneration furnace is regenerated. The activated carbon is sequentially introduced into the regenerated activated carbon receiving tank and the regenerated activated carbon storage tank. The regenerated activated carbon is sent from the regenerated charcoal storage tank to the top of the adsorption tower to supplement the activated carbon for adsorption and then treated with water. During regeneration, the cod component and other impurities adsorbed on the failure become gas, which is purified by a deodorizing furnace and a wet gas scrubber and then discharged by the chimney.
The activated carbon dephenolization method is suitable for treating small amounts of phenol-containing wastewater. The characteristics of activated carbon dephenolization method: simple equipment, easy operation, and the phenol removal rate is 85-90. However, the regeneration process is complicated, the pretreatment requirements are high, and the adsorbent cost is high.
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