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Method for treating sewage by combining nitrogen-doped sludge biochar and peroxydisulfate

A peroxodisulfate and biochar technology, applied in the field of water treatment, to achieve stable properties, good removal effect, and remarkable effect

Pending Publication Date: 2021-06-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is that nitrogen-doped sludge biochar formed by high-temperature pyrolysis efficiently activates peroxodisulfate to effectively remove organic pollutants and heavy metals in water, and provides a solution for the removal of organic pollutants and heavy metals in water. new ideas

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  • Method for treating sewage by combining nitrogen-doped sludge biochar and peroxydisulfate
  • Method for treating sewage by combining nitrogen-doped sludge biochar and peroxydisulfate

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Effect test

Embodiment 1

[0030] A method for nitrogen-doped pyrolysis sludge biochar combined with peroxodisulfate to jointly remove organic pollutants and heavy metals in water

[0031] Add 20 mg / L enrofloxacin to 4 parts of simulated water containing 1.4 mg / L chromium and antimony respectively, adjust the pH of the system to 7 with phosphate buffer solution, and add 1 mM PDS, dicyandiamide and pollutants to it respectively. Nitrogen-doped sludge materials with a biochar doping ratio of 0:1 to 3:1 were placed in a magnetic stirrer for reaction, and nitrogen samples were used for HPLC at 0, 1, 2, 5, 10, 15, 20, and 30 minutes respectively. Observe the degradation of organic pollutants, and investigate the removal of heavy metals by ICP-MS at 0 and 30 mi nitrogen. After 30 minutes of reaction, it was found that the combination of nitrogen-doped sludge biochar material and peroxodisulfate greatly accelerated the reaction rate of organic matter and heavy metals, and the removal effect of enrofloxacin and...

Embodiment 2

[0033] A method for nitrogen-doped pyrolysis sludge biochar combined with peroxodisulfate to jointly remove organic pollutants and heavy metals in water

[0034]Add 20mg / L enrofloxacin to three simulated water bodies containing 1.4mg / L chromium and antimony respectively, adjust the pH of the system to 7 with phosphate buffer solution, and add 1mM PDS, 2g / L 2 nitrogen- BC, 2g / L BC and 5mM PDS were placed in a magnetic stirrer and placed in a magnetic stirrer to react, and nitrogen samples were taken at 0, 1, 2, 5, 10, 15, 20, and 30 mi respectively to observe the degradation of organic pollutants by HPLC. The removal of heavy metals was investigated by ICP-MS at 0 and 30mi nitrogen. The reaction found that PDS alone had no obvious removal effect on enrofloxacin and heavy metals, nitrogen-doped sludge biochar alone had good adsorption performance on organic pollutants and heavy metals, and the combination of nitrogen-doped sludge biochar and PDS was extremely effective. Acceler...

Embodiment 3

[0036] A method for nitrogen-doped pyrolysis sludge biochar combined with peroxodisulfate to remove organic pollutants and heavy metals in water

[0037] Add 20mg / L enrofloxacin to 4 simulated water bodies containing 1.4mg / L chromium and antimony respectively, adjust the solution with phosphate buffer solution to adjust pH=3, 5, 7, 9, and then add 2g / L 2 nitrogen-BC and 1mM PDS were placed in a magnetic stirrer for reaction, and samples were taken at 0, 1, 2, 5, 10, 15, 20, and 30 mi nitrogen, and organic pollutants were observed by HPLC. At 0 time and 30 mi nitrogen The removal of heavy metals was investigated by ICP-MS. The reaction found that nitrogen-doped sludge biochar had the best removal effect on heavy metals under acidic conditions, while the removal efficiency of organic matter was fastest under neutral conditions, followed by alkaline, and the removal rate under acidic conditions was still close to 95%. For the specific removal effect of organic pollutants, see ...

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Abstract

The invention discloses a method for treating sewage by combining nitrogen-doped sludge biochar and peroxydisulfate, which is characterized by comprising the following steps of: taking back sludge, standing until mud-water separation, pouring out supernate, carrying out suction filtration on the sludge, drying to constant weight, mixing the sludge with nitrogen-containing organic matters, pyrolyzing in a tube furnace in a nitrogen atmosphere, taking out, washing with clear water to be neutral, and drying to obtain biochar; and simultaneously adding the biochar and the peroxydisulfate into the sewage containing the organic pollutants and the heavy metals at normal temperature and normal pressure, and continuously stirring the whole system to remove the organic pollutants and the heavy metals in the sewage . The nitrogen-doped sludge biochar can efficiently activate peroxydisulfate after high-temperature pyrolysis, can react with most of organic pollutants and remove heavy metal, and is high in reaction rate and low in influence of pH in water.

Description

technical field [0001] The invention relates to a method for removing organic pollutants and heavy metals in water bodies, in particular to a method for efficiently removing organic pollutants in water bodies by using high-temperature pyrolysis nitrogen-doped sludge biochar in parallel with peroxodisulfate in the field of water treatment and heavy metals, belonging to the technical field of water treatment. Background technique [0002] In recent years, my country's economic growth rate has entered a high-speed development level, the process of industrialization has been further improved, and the exploitation and use of surface water has increased day by day, resulting in increasingly serious water pollution problems. With the passage of time, a considerable part of pollutants in surface water, including common pollutants, new pollutants and heavy metals, are easy to wash away through surface runoff and rainwater, and gradually soak into the groundwater environment and soil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/20C02F101/30
CPCC02F1/72C02F1/725C02F2101/30C02F2101/20
Inventor 钱雅洁方智煌余阳薛罡高品陈红李响周子琳沈芸李倩巫秀玲
Owner DONGHUA UNIV
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