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Preparing method and application of nitrogen-doped sludge carbon-loaded nanometer ferroferric oxide

A technology of ferroferric oxide and sludge carbon, which is applied in the field of comprehensive waste utilization and water treatment, can solve the problems of high cost of activated carbon, unfavorable long-term use, environmental pollution, etc., and achieve high value-added utilization, high energy recovery, The effect of good economic and environmental benefits

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

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Problems solved by technology

However, the high cost of activated carbon is not conducive to its wide and long-term use, while the wastewater biological treatment process in my country produces about 11 million tons of sewage sludge (water content 80%) every year, and the disposal cost accounts for 30-40% of the investment in sewage plants. If not handled properly, it will cause serious environmental pollution

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  • Preparing method and application of nitrogen-doped sludge carbon-loaded nanometer ferroferric oxide
  • Preparing method and application of nitrogen-doped sludge carbon-loaded nanometer ferroferric oxide
  • Preparing method and application of nitrogen-doped sludge carbon-loaded nanometer ferroferric oxide

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Embodiment 1

[0035] The raw sewage sludge is dehydrated to a moisture content of 80-85%, pickled with 1mol / L HCl, stirred slowly by a stirrer for 3 hours, dried in an oven at 85°C for 12 hours, and crushed to a particle size of 2 As an activator, the impregnation volume ratio of the dried hydrothermal biochar was 3:1. After 4 hours of immersion, it was allowed to stand still for 10 hours. The supernatant was recovered and dried at 95°C for 12 hours. Then carry out high-temperature closed carbonization, the temperature of the high-temperature carbonization process is 700°C, the pyrolysis time is 3 hours, and high-purity nitrogen gas is introduced at a flow rate of 500mL / min to perform double nitrogen doping treatment. The final product was acid-washed with HCl, washed with distilled water, and the pH of the final eluent did not change, and dried at 105° C. for 12 hours to obtain nitrogen-doped sludge charcoal. Nitrogen-doped sludge with Fe 2+ The salt is dispersed in the aqueous solution, a...

Embodiment 2

[0045] The raw sewage sludge is dehydrated to a moisture content of 80-85%, pickled with 1mol / L HCl, stirred slowly by a stirrer for 3 hours, dried in an oven at 85°C for 12 hours, and crushed to a particle size of 2+ The salt is dispersed in the aqueous solution, and after passing nitrogen gas for 60 minutes, the aqueous solution is heated to 100°C and maintained at the temperature, and saturated sodium hydroxide solution is added dropwise until the pH of the aqueous solution is about 11 to carry out co-precipitation reaction. After magnetic separation, the co-precipitated product was pickled with HCl and washed with distilled water. The pH of the final eluate did not change. It was dried at 105°C for 12 hours and crushed to a particle size of <0.1 mm to obtain nitrogen-doped sludge carbon-loaded nanoparticles. Ferric oxide is sample 2.

[0046] Sample 2 is used to strengthen the anaerobic treatment of high-concentration printing and dyeing wastewater. The anaerobic reactor ad...

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Abstract

The invention discloses a method for preparing nitrogen-doped sludge carbon-loaded nanometer ferroferric oxide with waste sewage sludge as the raw material through hydrothermal and pyrolysis carbonizing, and application of the nitrogen-doped sludge carbon-loaded nanometer ferroferric oxide to enhancing wastewater anaerobic treatment technological performance. The method includes the following steps of conducting nitrogen source doping on dewatered sewage sludge through hydrothermal carbonizing, introducing nitrogen for secondary nitrogen doping in the high-temperature pyrolysis biochar preparing process to finally prepare nitrogen-doped sludge charcoal, and conducting ferric salt coprecipitation to prepare the nitrogen-doped sludge carbon-loaded nanometer ferroferric oxide. The prepared carbon material has high specific surface area and porosity, the anaerobic sludge granulation is facilitated, the conductivity of anaerobic sludge can be improved, the electron transfer of anaerobic degradation is promoted, the removal efficiency of the degradation-resistant wastewater anaerobic active sludge is enhanced, and the generation of methane is promoted. The carbon material is low in costand efficient and stable in performance, the high-additional-value resourceful utilization of the waste sewage sludge is effectively realized, and the performance of the degradation-resistant wastewater anaerobic treatment process is better improved.

Description

technical field [0001] The invention relates to the preparation of nitrogen-doped sludge charcoal-supported nano ferric oxide, which is applied to strengthen the anaerobic removal performance of refractory wastewater, and belongs to the fields of waste comprehensive utilization and water treatment. Background technique [0002] Anaerobic biotechnology has been widely studied and applied in the field of environmental pollution control because of its outstanding technical and economic advantages such as high organic load, low energy consumption and resource recovery. The rapid development of industrialization has led to the incorporation of a large number of refractory organic pollutants such as phenols, nitrogen heterocycles and polycyclic aromatic hydrocarbons into wastewater. Because of their high biological toxicity, they seriously inhibit microbial activity and destroy the anaerobic biological process. Material degradation and electron transfer, how to economically and ef...

Claims

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Application Information

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IPC IPC(8): C02F3/28
CPCC02F3/28
Inventor 庄海峰平立凤单胜道张昌爱唐浩杰张进方程冉
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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