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Method for preparing carbon-based adsorption material by using sewage advanced treatment coagulated sludge and application of carbon-based adsorption material

A technology of advanced treatment and adsorption materials, applied in water/sewage treatment, pyrolysis treatment of sludge, adsorbed water/sewage treatment, etc. Achieve harmless and easy-to-operate effects

Pending Publication Date: 2022-03-08
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with the remaining activated sludge, the content of organic matter in coagulated sludge is low, resulting in poor pore-forming effect of the product, which limits the application of pyrolysis in coagulated sludge to a certain extent.

Method used

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  • Method for preparing carbon-based adsorption material by using sewage advanced treatment coagulated sludge and application of carbon-based adsorption material
  • Method for preparing carbon-based adsorption material by using sewage advanced treatment coagulated sludge and application of carbon-based adsorption material
  • Method for preparing carbon-based adsorption material by using sewage advanced treatment coagulated sludge and application of carbon-based adsorption material

Examples

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Effect test

Embodiment 1

[0034] 1) Dry the coagulation sludge of advanced sewage treatment in an electric heating constant temperature blast drying oven at 60°C to constant weight, and use polyaluminum chloride as a flocculant in the advanced treatment process;

[0035] 2) Grinding the advanced treatment coagulation sludge after step 1) into powder with a grinder and passing through a 100 mesh sieve to obtain powdery sludge with a particle size of about 0.15mm, such as Figure 5 shown;

[0036] 3) Put the sludge powder treated in step 2) into a tube furnace for pyrolysis. During the pyrolysis process, continuously feed carbon dioxide at a rate of 100 mL / min to maintain an oxygen-free environment, and raise the temperature to 400 °C at a rate of 10 °C / min. , keep warm and pyrolyze for 2h;

[0037] 4) Cool down to 25±2°C under the condition of continuously feeding carbon dioxide to obtain coagulated sludge carbon-based products for advanced sewage treatment, such as Figure 4 shown.

[0038] Carry ou...

Embodiment 2

[0061] The difference between this example and Example 1 is that the constant pyrolysis temperature is 700° C., and the rest of the operation steps are the same as those of Example 1.

[0062] The advanced treatment sludge charcoal-based product obtained in this embodiment has no ecological toxicity risk, and the SEM photo is as follows figure 2 As shown, the product has a rough and irregular surface, and the BET specific surface area is 135.09m 2 g -1 , the total pore volume is 0.191cm 3 g -1 . The static adsorption capacity of this product for phosphorus is 12mg-P g -1 , the static adsorption capacity of lead, a representative heavy metal substance, is 34 mg g -1 , the adsorption capacity of methylene blue is 15 mg g -1 .

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Abstract

The invention discloses a method for preparing a carbon-based adsorption material by using sewage advanced treatment coagulated sludge, and belongs to the technical field of sludge treatment and resource preparation. Carbon dioxide or a mixed gas of carbon dioxide and nitrogen is used as an anaerobic pyrolysis atmosphere to replace a traditional nitrogen atmosphere, carbon dioxide is used as an activating agent, pyrolysis of volatile organic compounds is promoted, the yield of tar is reduced, the porosity of a sludge carbon-based product is remarkably improved, and meanwhile the yield of the sludge is improved. The carbon dioxide enhances the splitting decomposition of the organic matters to further cause a stronger concentration effect, so that the relative content of amorphous aluminum in the carbon-based product is higher, more phosphorus adsorption sites are increased, and the carbon-based product has higher adsorption capacity on organic dyes methylene blue and phosphate and can be used for removing pollutants in a water environment.

Description

technical field [0001] The invention relates to a method for preparing carbon-based adsorption materials by using coagulation sludge for advanced treatment of sewage, and belongs to the technical field of sludge treatment and resource preparation. Background technique [0002] Coagulation sedimentation method is widely used as a simple and efficient advanced treatment process, which inevitably produces a large amount of coagulation sludge for advanced treatment of sewage. Different from traditional residual activated sludge, coagulated sludge has low content of toxic and harmful substances, and contains a large amount of aluminum / iron (hydroxide) oxides from flocculants. However, at present, the advanced treatment coagulation sludge has not been effectively treated and disposed separately, but directly mixed with the remaining activated sludge for digestion, composting, landfill, etc., which not only leads to the waste of metal compounds in the coagulation sludge , It also ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F11/10C02F11/13C02F11/00C02F1/28C02F101/10C02F101/20C02F101/30
CPCB01J20/20B01J20/08B01J20/06C02F11/10C02F11/12C02F11/00C02F1/281C02F1/283B01J2220/42B01J2220/4887C02F2101/20C02F2101/105C02F2101/308
Inventor 王秀蘅王梦悦杜彦武朴庸健张福贵吴丹李哲
Owner HARBIN INST OF TECH
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