Sludge-based activated carbon with effect of efficiently adsorbing PFOS (perfluorooctane sulfonate) and PFOA (perfluorooctanoic acid) and preparation method as well as application of sludge-based activated carbon

A technology of activated carbon and sludge, which is applied in the direction of chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem that sludge-based activated carbon is rarely used, and achieve good adsorption and removal effects , low cost, simple operation

Inactive Publication Date: 2017-05-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses slurry-based activation called Slugging Activated Carbon (SAC) with strong affinity towards both perfluoroalkyl substances (PFCAs), such as Perflurochloroethene or Fluorochemica Acta). It also works well at high concentrations like 1 ppm level but it needs more complex operations than previous methods due its poor efficiency on other types of chemical compounds that are commonly found together within wastewater treatment systems.

Problems solved by technology

This patented technical problem addressed by this patent relates to finding methods or materials with strong affinity towards various types of substances such as pharmaceuticals, pesticide compounds, carboxylic acids, etc., without being harmful themselves when released through natural processes like decomposition or bioremediation.

Method used

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  • Sludge-based activated carbon with effect of efficiently adsorbing PFOS (perfluorooctane sulfonate) and PFOA (perfluorooctanoic acid) and preparation method as well as application of sludge-based activated carbon
  • Sludge-based activated carbon with effect of efficiently adsorbing PFOS (perfluorooctane sulfonate) and PFOA (perfluorooctanoic acid) and preparation method as well as application of sludge-based activated carbon
  • Sludge-based activated carbon with effect of efficiently adsorbing PFOS (perfluorooctane sulfonate) and PFOA (perfluorooctanoic acid) and preparation method as well as application of sludge-based activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1.1 Preparation of sludge-based activated carbon

[0033] The undigested dewatered sludge of the municipal sewage treatment plant was vacuum dried at 105°C to a moisture content of 10%, and then passed through a 160-mesh sieve after grinding; then the sludge was immersed in 0.5 mol / L ZnCl 2 In the solution, activate at 40°C for 24 hours. The activated sample is centrifuged and dried; the dried sludge sample is carbonized in a muffle furnace at 600°C for 45 minutes, and the obtained crude sample is repeatedly washed with water 3 times. Dry to constant weight; immerse the crude sample in 3mol / L hydrochloric acid for 1 hour, cool to room temperature, repeatedly wash with water to neutral, and dry at 60°C to constant weight to obtain sludge-based activated carbon.

[0034] From Figure 1a It can be clearly seen that the original sludge has a dense surface and an underdeveloped pore structure. After being prepared into activated carbon, it has more pores, fine and uniform pore dist...

Embodiment 2

[0039] The steps are the same as in Example 1, except that during the preparation of sludge-based activated carbon, the sludge is immersed in 0.1 mol / L ZnCl 2 The solution was activated at 30°C for 12h, and the activated sample was centrifuged and dried; the dried sludge sample was carbonized in a muffle furnace at 700°C for 2h to obtain sludge-based activated carbon.

[0040] The steps are the same as in Example 1. During the adsorption process, the temperature is 25°C, the pH is 3, the constant-temperature oscillation speed is 160 rpm, the concentration of PFOS and PFOA in the adsorption reaction system are both 0.5 mg / L, and the sludge-based activated carbon is used for adsorption The addition amount of the agent in the adsorption reaction system is 10mg / L, the final PFOS removal rate is 94.9%, and the PFOA removal rate is 54.3%.

Embodiment 3

[0042] The steps are the same as in Example 1, except that during the preparation of sludge-based activated carbon, the sludge is immersed in 0.25 mol / L of ZnCl 2 The solution was activated at 50°C for 18h, and the activated sample was centrifuged and dried; the dried sludge sample was carbonized in a muffle furnace at 800°C for 1.5h to prepare sludge-based activated carbon.

[0043] The steps are the same as in Example 1, except that during the adsorption process, the temperature is 25°C, the pH is 6, the constant-temperature oscillation speed is 160 rpm, and the sample is sampled after 12 hours of oscillation. The concentration of PFOS and PFOA in the adsorption reaction system are both 0.5 mg / L. The addition amount of base activated carbon used as adsorbent in the adsorption reaction system is 50mg / L, the final PFOS removal rate is 99.5%, and the PFOA removal rate is 82.8%.

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Abstract

The invention discloses sludge-based activated carbon with an effect of efficiently adsorbing PFOS (perfluorooctane sulfonate) and PFOA (perfluorooctanoic acid) and a preparation method as well as application of the sludge-based activated carbon. The sludge-based activated carbon is prepared by drying, activation, high temperature carbonization treatment, acid leaching, washing and stoving. In waste water containing the PFOS and the PFOA, the sludge-based activated carbon is used as an adsorber. After a small quantity of the activated carbon is added, adsorption removal rates of the PFOS and the PFOA with low concentration reach up to 99.9 percent and 71.0 percent. By using the method to prepare the sludge-based activated carbon, the operation is simple, the cost is low, the adsorption removal effects on the PFOS and the PFOA are good, recycling of sludge waste is realized, and meanwhile reference is provided for solving the pollution problem of perfluorinated compounds.

Description

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Claims

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Application Information

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Owner SOUTH CHINA UNIV OF TECH
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