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Composite iron-carbon filler based on sludge iron-rich biochar as well as preparation and application of composite iron-carbon filler

A technology of iron-carbon filler and biochar is applied in the field of pollutant degradation, which can solve the problem of low reactivity of iron-carbon filler, and achieve the effects of improving wastewater treatment efficiency, uniform iron phase loading and high porosity

Pending Publication Date: 2022-05-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention solves the technical problem of low reactivity of iron-carbon fillers in the prior art, and provides a preparation method and application for preparing composite iron-carbon fillers by directly utilizing iron-containing sludge for pyrolysis to obtain iron-rich biochar from sludge. The reactive iron phase is evenly distributed on the sludge biochar skeleton, resulting in a new iron-carbon structure with high reactivity, high porosity and uniform iron phase loading

Method used

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  • Composite iron-carbon filler based on sludge iron-rich biochar as well as preparation and application of composite iron-carbon filler
  • Composite iron-carbon filler based on sludge iron-rich biochar as well as preparation and application of composite iron-carbon filler
  • Composite iron-carbon filler based on sludge iron-rich biochar as well as preparation and application of composite iron-carbon filler

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preparation example Construction

[0040] The preparation process is to directly use iron-containing sludge for pyrolysis to obtain sludge iron-rich biochar, so that the reactive iron phase is evenly distributed on the sludge biochar skeleton.

[0041] In order to achieve the above objectives, dehydration of iron-containing sludge, dry grinding of iron-containing dewatered cake, iron-carbon ratio adjustment of iron-containing dried sludge before pyrolysis, pyrolysis process parameters (including temperature, time, protective gas flow rate) ), the proportion deployment of sludge iron-rich biochar and binder, the preparation conditions and preparation methods of composite iron-carbon filler were optimized and controlled.

[0042] The auxiliary components can be but not limited to sodium silicate, sodium humate, sodium carboxymethyl cellulose, hydroxypropyl cellulose, calcium chloride, clay, polyurethane, epoxy resin and acrylates have similar Forming and bonding agent.

[0043] The iron salt conditioning agent d...

Embodiment 1

[0081] The composite iron-carbon filler is composed of the following components: 70 parts by weight of sludge iron-rich biochar, 10 parts by weight of sodium silicate, and 20 parts by weight of sodium humate;

[0082] The method for preparing the above-mentioned composite iron-carbon filler comprises the following steps:

[0083] Step 1: Dissolve the binder sodium silicate in a small amount of water;

[0084] Step 2: Mix the sludge iron-rich biochar, sodium silicate, and sodium humate evenly according to the weight ratio, add pure water during the process, and hand-knead into spherical composite iron-carbon filler particles;

[0085] Step 3: Dry the pellets obtained in Step 2 at 60°C for 3 hours;

[0086] Step 4: Calcining the pellets formed in Step 3 at 700° C. for 1 hour in the same atmosphere of a tube furnace to obtain a sintered composite iron-carbon filler with abundant pores.

Embodiment 2

[0088] The composite iron-carbon filler is composed of the following components: 70 parts by weight of sludge iron-rich biochar, 10 parts by weight of sodium silicate, and 20 parts by weight of sodium humate;

[0089] The method for preparing the above-mentioned composite iron-carbon filler comprises the following steps:

[0090] Step 1: Dissolve the binder sodium silicate in a small amount of water;

[0091] Step 2: Mix the sludge iron-rich biochar, sodium silicate, and sodium humate evenly according to the weight ratio, add pure water during the process, and hand-knead into spherical composite iron-carbon filler particles;

[0092] Step 3: Dry the pellets obtained in Step 2 at 60°C for 3 hours;

[0093] Step 4: Calcining the pellets formed in Step 3 at 800° C. for 1 hour in the same atmosphere of a tube furnace to obtain a sintered composite iron-carbon filler with abundant pores.

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Abstract

The invention discloses a composite iron-carbon filler based on sludge iron-rich biochar as well as preparation and application thereof, and belongs to the technical field of pollutant degradation. The method comprises the following steps: dewatering sludge to obtain a mud cake, then adding an iron source, and pyrolyzing to obtain biochar with an iron-loaded carbon skeleton; then adding a binder to form a granular composite iron-carbon filler intermediate product; and roasting to obtain the porous composite iron-carbon filler. According to the preparation process, an iron phase with reaction activity is uniformly distributed on a sludge biological carbon skeleton, the carbon skeleton can play a role of an electron transmission channel and has a certain oxidation-reduction characteristic, and compared with a traditional iron-carbon composite material, the iron-carbon composite material has a better degradation effect on pollutants in landfill leachate.

Description

Technical field [0001] The present invention relates to the technical field of pollutant degradation, and more specifically, to a composite iron-carbon filler based on sludge iron-rich biochar and its preparation and application. In particular, it relates to a sludge iron-rich biochar with a carbon skeleton evenly loaded with iron. Microelectrolytic composite iron-carbon fillers are prepared as raw materials and used for landfill leachate or industrial wastewater treatment. Background technique [0002] Iron-carbon micro-electrolysis technology, also known as internal electrolysis, is one of the effective means to pretreat high-concentration refractory organic industrial wastewater, such as dye wastewater, petrochemical wastewater, pharmaceutical wastewater, landfill leachate, and coking wastewater. The principle is that iron and carbon spontaneously form a microscopic primary battery without electricity, in which iron forms the anode and carbon forms the cathode, and Fe is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F101/30
CPCC02F1/46176C02F1/46114C02F2001/46133C02F2101/30Y02W10/10
Inventor 杨家宽陈新月虞文波陶爽奕祝雨薇卞士杰侯慧杰梁莎袁书珊
Owner HUAZHONG UNIV OF SCI & TECH
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