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Preparation method and application of hydroxy ferric sulfate sludge-based charcoal

A technology of ferric hydroxysulfate and biochar is applied in the fields of water pollutants, chemical instruments and methods, water/sludge/sewage treatment, etc. It can solve the problems of inability to arsenic, adsorption, etc. Realize the effect of reducing and harmless

Active Publication Date: 2016-12-07
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses natural iron from wastewater treatment plants or sewage processing facilities to create ferrisulphoxide (Fe3O4) that effectively removes arsenes such as lead into water streams while reducing environmental concerns associated with disposal methods like landfilling. Additionally, this technique provides for efficient production of biomass by converting it back into useful products through processes called coking.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to effectively remove arsenious metallic elements from various types of materials such as coal ash, cinder oil, plastic scrapings, etc., without causing environmental concerns like soil contamination.

Method used

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  • Preparation method and application of hydroxy ferric sulfate sludge-based charcoal
  • Preparation method and application of hydroxy ferric sulfate sludge-based charcoal
  • Preparation method and application of hydroxy ferric sulfate sludge-based charcoal

Examples

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Embodiment 1

[0023] A preparation method of ferric hydroxysulfate sludge-based biochar, including the following steps:

[0024] 1. Add 9.2mol / L sulfuric acid to the municipal sludge with a water content of 2wt% in the independent cell air lift plug flow reactor to adjust the pH to 4, and react for 24h to make the sludge Endogenous iron precipitates and the precipitation rate is 50%;

[0025] 2. Inject acidophilic Thiobacillus ferrooxidans into the above sludge, the inoculation amount is 10wt%, the sludge is continuously aerated after inoculation, stay in the reactor for 48h, and react to Fe in the sludge solution 2+ The oxidation rate is greater than 95% to obtain ferric hydroxysulfate sludge;

[0026] 3. The above-mentioned ferric hydroxysulfate sludge is dehydrated by press filtration, the moisture content of the sludge after dehydration is 55-65%, and the dehydrated sludge is dried at 105°C for 8 hours;

[0027] 4. Grind the above-mentioned dried sludge through a 2mm sieve, and put the sieved s...

Embodiment 2

[0033] A preparation method of ferric hydroxysulfate sludge-based biochar, including the following steps:

[0034] 1. Add 9.2mol / L sulfuric acid to the municipal sludge with a water content of 3wt% to adjust the pH to 4 and react for 48h to make the sludge The endogenous iron is precipitated and the precipitation rate is 80%;

[0035] 2. Inject acidophilic Thiobacillus ferrooxidans into the above sludge, the inoculation amount is 10wt%, the sludge is continuously aerated after inoculation, stay in the reactor for 48h, and react to Fe in the sludge solution 2+ The oxidation rate is greater than 95% to obtain ferric hydroxysulfate sludge;

[0036] 3. The above-mentioned ferric hydroxysulfate sludge is dehydrated by press filtration, the moisture content of the sludge after dehydration is 65%, and the dehydrated sludge is dried at 105°C for 8 hours;

[0037] 4. Grind the above-mentioned dried sludge through a 2mm sieve, and put the sieved sludge in N 2 Pyrolysis under protection for 1h, ...

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Abstract

The invention provides a method for preparing hydroxy ferric sulfate slurry-based charcoal. The method comprises the following steps: (1) adjusting the pH value of a conventional municipal sludge solution with sulfuric acid to separate internal iron in sludge; (2) inoculating acidithiobacillus ferrooxidans into the sludge, wherein hydroxyl ferric sulfate sludge is formed from the acidithiobacillus ferrooxidans by utilizing the internal iron in the sludge; (3) dehydrating the hydroxyl ferric sulfate sludge, and drying; and (4) grinding and screening the dried sludge, and pyrolyzing the screened sludge in N2 protection. The hydroxy ferric sulfate slurry-based charcoal formed by pyrolysis contains schwertmannite which has an efficient and specific adsorbing effect on arsenic. The hydroxy ferric sulfate slurry-based charcoal has the advantages that hydroxyl ferric sulfate is generated by utilizing internal iron in sludge, and cost is reduced; the prepared hydroxy ferric sulfate slurry-based charcoal can be used for efficiently specifically adsorbing arsenic in sludge, so that the sludge resource is utilized, and a novel arsenic adsorbent is provided.

Description

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Claims

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Application Information

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Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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