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Preparing method and application of nitrogen-doped magnetic biochar

A technology of biochar and nitrogen doping, applied in chemical instruments and methods, waste fuels, carbon compounds, etc., can solve the problems of easy agglomeration of particles, heavy metal pollution, high cost, etc., and achieve simple operation, increased biodegradability, and reduced The effect of preparation costs

Active Publication Date: 2019-08-27
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But nano-Fe 3 o 4 Particles are easy to agglomerate and lose, and the cost is high. How to find its substitute, reduce the cost and realize the continuous utilization of its catalytic activity is the key to the wide application of this technology
[0005] On the other hand, both the traditional Fenton oxidation process and the industrial application process of iron-carbon micro-electrolysis will produce a large amount of sludge with high iron content, mainly Fe 3 o 4 , referred to as iron sludge, if not handled properly, it will cause heavy metal pollution and cause serious harm to the environment

Method used

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Embodiment 1

[0035] Wash the agricultural and forestry waste soybean protein residues, and crush them to 0.1~1cm slag by using a pulverizer. The waste iron sludge from the Fenton oxidation process is cleaned, dried, and ready for use, wherein the iron content is 30wt% and above. The weight ratio of soybean protein residue to iron sludge is 2:0.5, 3mol / L KOH is used as medium and activator, the volume ratio of solid to liquid is 3:0.1, and 3wt% bentonite is used as a binder to be uniformly dispersed into the liquid through an ultrasonic disperser medium. The hydrothermal carbonization is assisted by microwave, the microwave power is 250W, the hydrothermal carbonization temperature is 180°C, the stirrer is mixed at 90 rpm, and the reaction time is 5 hours. After the hydrothermal reaction, cool to 60°C, pickle with 0.5mol / L HCl, then wash with distilled water until the pH does not change, filter with a vacuum pump to obtain hydrothermal biochar with a moisture content of 30 wt%, and dry at 9...

Embodiment 2

[0043] Clean the water hyacinth which is agricultural and forestry waste, and crush it to 0.1-1cm slag with a crusher. The waste iron sludge from the Fenton oxidation process is cleaned, dried, and ready for use, wherein the iron content is 30wt% and above. The weight ratio of water hyacinth to iron mud is 2:0.3, 3mol / L ZnCl 2 As a medium and an activator, the volume ratio of solid to liquid is 3:0.2, and 4wt% bentonite is uniformly dispersed into the liquid medium as a binder by an ultrasonic disperser. Microwave-assisted hydrothermal carbonization was adopted, the microwave power was 300W, the hydrothermal carbonization condition was 210°C, the stirrer was mixed at 80 rpm, and the reaction time was 4 hours. After the hydrothermal reaction is completed, cool to 60°C and use 0.5mol / L H 3 PO 4 Pickling, then distilled water washing until the pH does not change, vacuum pump filtration to obtain hydrothermal biochar with a moisture content of 20 wt%, drying at 90°C for 12 hour...

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Abstract

The invention discloses a preparing method of nitrogen-doped magnetic biochar and application of the nitrogen-doped magnetic biochar to enhancing anaerobic fermentation performance. According to the specific preparing process, with high-nitrogen-content agricultural and forestry waste as the substance basis in combination with industrial waste iron cement, through a hydrothermal carbonizing and high-temperature pyrolysis carbonizing method, an in-situ nitrogen-doped magnetic biochar carrier is prepared. The biochar carrier has the high specific surface area and porosity and high nitrogen and iron content, the pollutant removal and methane yield in the anaerobic fermentation process are remarkably improved, the inhibition of volatile acid in the fermentation process can be relieved, and thehigh efficiency and stability of the anaerobic fermentation performance are guaranteed. The high-additional-value resourceful utilization of agricultural and forestry waste is effectively solved, theanaerobic fermentation performance is better improved, and the method belongs to the economical, environment-friendly 'waste-control-by-waste' novel efficient anaerobic fermentation technology and issuitable for industrial application and popularization.

Description

technical field [0001] The invention belongs to the field of anaerobic fermentation, and in particular relates to a preparation method and application of nitrogen-doped magnetic biochar for enhancing anaerobic fermentation performance. Background technique [0002] Anaerobic fermentation can use a variety of wastes to biodegrade under anaerobic conditions and generate biogas, which not only solves the problem of pollutant removal, but also realizes energy recovery, which is environmentally friendly and easy to promote. Various anaerobic fermentation projects across the country have made important contributions to the comprehensive utilization of high-concentration organic wastewater, livestock and poultry waste, domestic garbage, and industrial organic waste. However, the current anaerobic fermentation still has serious problems such as low methane production rate and the system is susceptible to acidification inhibition. The large-scale promotion and application of anaerob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/342C01B32/324C02F3/28C12P5/02
CPCC01G49/08C01P2004/80C02F3/28C12P5/02C12P5/023C01B32/324C01B32/342C01B32/348Y02E50/30
Inventor 庄海峰单胜道平立凤张昌爱唐浩杰张进方程冉
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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