What are the main factors of filtration rate and adsorption of nutshell activated carbon?

Activated carbon filtration rates of various models and materials are different. The filtration rate of some activated carbons with high mechanical strength is generally much faster than that of low-strength activated carbon. Activated carbon is divided into many specifications and materials. I will briefly explain to you what the filtration rate of nutshell activated carbon is. It is an important indicator that affects water quality and operation management. It is related to the influent flow rate (that is, the scale of production) and the area of ​​the filter. Therefore, the filtration rate cannot be adjusted during normal operation. The design must first consider selecting a reasonable filtration rate. Under the condition of a certain carbon layer thickness, the slower the filtration rate, the longer the contact time, and the longer the contact time, the better the adsorption effect of activated carbon and the better the effluent quality. The filtration rate of activated carbon filters in European and American water plants is generally 7.5-15m/h. The minimum flow rate of nutshell activated carbon is 9-12.5m/sec. The nutshell activated carbon is divided into coconut shell activated carbon and apricot shell activated carbon, which are called nutshell activated carbon. , Sometimes it’s not too standard, but it’s basically like this.

The main factors affecting the adsorption of activated carbon:

  • The nature of the activated carbon adsorbent, the larger its surface area, the stronger the adsorption capacity; The activated carbon is a non-polar molecule, which is easy to adsorb non-polar or very low-polar adsorbates; the size of the activated carbon adsorbent particles, the structure of the pores and the The distribution and surface chemistry also have a great influence on the adsorption.
  • The nature of the adsorbate depends on its solubility, surface free energy, polarity, size and unsaturation of the adsorbate molecule, concentration of the adjunct, etc.
  • The pH value of wastewater and activated carbon generally have a higher adsorption rate in acidic solutions than in alkaline solutions. The pH value will affect the state and solubility of the adsorbate in the water, thereby affecting the adsorption effect.
  • When coexisting substances and multiple adsorbates coexist, the adsorption capacity of activated carbon for a certain adsorbate is worse than when it contains only the adsorbate
  • Temperature and temperature have little effect on the adsorption of activated carbon
  • The contact time should ensure that the activated carbon and the adsorbent have a certain contact time to make the adsorption close to equilibrium and make full use of the adsorption capacity.
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