Preparation method and application of a kind of hydroxy iron sulfate sludge-based biochar

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

Active Publication Date: 2018-12-14
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The iron source in the sludge exists in the form of ferrous phosphate, which cannot adsorb arsenic

Method used

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  • Preparation method and application of a kind of hydroxy iron sulfate sludge-based biochar
  • Preparation method and application of a kind of hydroxy iron sulfate sludge-based biochar
  • Preparation method and application of a kind of hydroxy iron sulfate sludge-based biochar

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Embodiment 1

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

[0024] 1. Add sulfuric acid with a concentration of 9.2mol / L to adjust the pH to 4 in the municipal sludge with a moisture content of 2wt% in the aerated air-lifting plug-flow reactor, and react for 24 hours to make the sludge The endogenous iron is precipitated and the precipitation rate is 50%;

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

[0026] 3. Dewater the above iron hydroxysulfate sludge by pressure filtration, the moisture content of the dehydrated sludge is 55-65%, and the dehydrated sludge is dried at 105°C for 8 hours;

[0027] 4. Grind the above-mentioned dried sludge through...

Embodiment 2

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

[0034] 1. Add sulfuric acid with a concentration of 9.2mol / L to adjust the pH to 4 in the municipal sludge with a moisture content of 3wt% in the aerated air-lifting plug-flow reactor in an independent grid, and react for 48 hours to make the sludge in the sludge The endogenous iron is precipitated and the precipitation rate is 80%;

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

[0036] 3. Dewater the above iron hydroxysulfate sludge by pressure filtration, the moisture content of the dehydrated sludge is 65%, and the dehydrated sludge is dried at 105°C for 8 hours;

[0037] 4. Grind the ab...

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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

technical field [0001] The invention belongs to the field of biomass processing, and in particular relates to a preparation method and application of ferric hydroxysulfate sludge-based biochar. Background technique [0002] Municipal sludge is solid and semi-solid waste formed during the process of purifying sewage in urban sewage plants, and is an inevitable product of sewage treatment. As of 2014, the national daily sewage treatment volume was 153 million m 3 / d, the daily production of sludge with a moisture content of 80% exceeds 30 million tons, and this figure continues to grow. Arsenic is a carcinogen that is toxic to the human body and other organisms. Mine mining, discharge of arsenic-containing industrial wastes, etc. will all cause arsenic pollution. Arsenic in the environment can enter the human body through the food chain, drinking water or direct contact and cause harm to human health. [0003] During the operation of the sewage plant, in order to make the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/20C02F1/283C02F2101/103
Inventor 秦松岩张芹黄鹏郭丽娜陈文邦刘天顺
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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