Preparation method of ferric sulfide modified sludge-based biochar

A technology of iron sulfide and biochar, which is applied in the field of biomass resource utilization, can solve the problems of waste of resources and a large amount of funds, and achieve the effects of simple production process, realization of degradation and removal, good economic value and practicability

Inactive Publication Date: 2018-04-10
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: Aiming at the problem that the traditional disposal method of existing sludge not only requires a large amount of funds, but may also cause waste of resources, the present invention provides a method for preparing nano-iron sulfide modified biochar from sludge, so as to realize sludge Resource disposal, the method is simple to operate and the preparation raw materials are easy to obtain; the iron sulfide modified biochar prepared by the method of the present invention has good solid-liquid separation effect, strong catalytic conversion and adsorption removal effect on organic matter, and has no effect on heavy metal pollution. The substance also has good adsorption capacity, and has the characteristics of repeated use.

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  • Preparation method of ferric sulfide modified sludge-based biochar

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Effect test

Embodiment 1

[0031] Such as figure 1 Shown flow chart, a kind of method utilizing sludge to prepare nano iron sulfide modified biochar of the present invention, concrete steps are as follows:

[0032] (1) After the sludge is dried and pulverized to 20 meshes, take 100 g of the powder, add the sludge powder to 500 mL of sodium carbonate solution with a mass concentration of 10%, stir well, then soak for 4 hours at room temperature, discard the remaining After liquid, dry for later use;

[0033] (2) Place the above powder in the atmosphere furnace, set the temperature of the atmosphere furnace to 400°C, the heating rate is 15°C / min, keep it warm for 2 hours, and take it out after naturally cooling to room temperature;

[0034] (3) Mix 100g of the sludge obtained from the above treatment with a ferric chloride solution with a concentration of 0.20mol / L and a volume of 200mL. The immersion temperature is controlled at 20°C and the immersion time is 4h to ensure sufficient immersion. After imm...

Embodiment 2

[0040] A method of utilizing sludge to prepare nano-iron sulfide modified biochar of the present invention, the specific method steps are as follows:

[0041] (1) After the sludge is dried and pulverized to 60 mesh, take 100g of the powder, add the sludge powder to 800mL of sodium carbonate solution with a mass concentration of 10%, stir well, then immerse at room temperature for 8h, discard After remaining liquid, dry it for later use;

[0042] (2) Place the above powder in an atmosphere furnace, set the temperature of the atmosphere furnace at 600°C, heat up at a rate of 20°C / min, keep it warm for 3 hours, and take it out after naturally cooling to room temperature;

[0043] (3) Mix 100g of the sludge obtained from the above treatment with a ferric chloride solution with a concentration of 0.40mol / L and a volume of 500mL. The immersion temperature is controlled at 30°C and the immersion time is 6h to ensure sufficient immersion. After immersion, use processed in the next step...

Embodiment 3

[0050] A method of utilizing sludge to prepare nano-iron sulfide modified biochar of the present invention, the specific method steps are as follows:

[0051] (1) After the sludge is dried and pulverized to 60 meshes, take 100 g of the powder, add the sludge powder to 800 mL of sodium carbonate solution with a mass concentration of 10%, stir well, then soak at room temperature for 10 h, discard the remaining After liquid, dry for later use;

[0052] (2) Place the above powder in the atmosphere furnace, set the temperature of the atmosphere furnace at 700°C, and the heating rate is 25°C / min, keep it for 4 hours, and take it out after naturally cooling to room temperature;

[0053] (3) Mix 10 g of the sludge obtained from the above treatment with a ferrous sulfate solution with a concentration of 0.80 mol / L and a volume of 100 mL. The immersion temperature is controlled at 35 ° C, and the immersion time is 12 hours to ensure sufficient immersion. After immersion, it is used nex...

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Abstract

The invention discloses a preparation method of ferric sulfide modified sludge-based biochar, and belongs to the field of biomass resource utilization. According to the preparation method, the ferricsulfide modified sludge-based biochar is obtained via following steps: ferric salt dipping, high temperature anaerobic activation, hydroboron reduction, and sulfide modification. The preparation method is simple; the raw materials are easily available; active sludge resource utilization is realized; great importance on expansion of active sludge treatment method and biochar adsorbent sources and application ranges is achieved; the ferric sulfide modified sludge-based biochar can be widely used in the fields of water treatment and soil restoration, and excellent economic benefit and social benefit are achieved.

Description

technical field [0001] The invention belongs to the field of biomass resource utilization, and in particular relates to a preparation method of iron sulfide modified sludge-based biochar. Background technique [0002] my country's urban sewage treatment coverage rate has exceeded 85%, but with the increase of sewage treatment rate, sludge is an important by-product of sewage treatment system, and its output is increasing year by year. According to reports, my country discharges about 40 million tons of excess sludge per year. It is estimated that by 2020, my country's municipal surplus sludge production will reach 60 million tons - 90 million tons. At present, the traditional sludge disposal methods include landfill, incineration, composting, and cultivation. However, the traditional disposal method of sludge not only requires a large amount of funds, but also requires a large area of ​​land. In addition, sludge contains a large amount of heavy metals, flocculants, and pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C10B57/06C02F11/10C02F11/12
CPCC02F11/10C02F11/12C10B53/00C10B57/06Y02E50/30
Inventor 刘军李钦钦戴昕
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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