Method for synchronously removing heavy metal-organic matter combined pollution

A technology for compound pollution and organic pollutants, applied in water pollutants, chemical instruments and methods, water/sewage treatment, etc., to achieve the effect of reducing the level of biological toxicity, promoting catalysis and efficient removal

Pending Publication Date: 2022-06-28
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] N-doped biochar has a good application prospect in the removal of heavy metals and antibiotics in wastewater, but there is no method to simultaneously remove heavy metal and organic compound pollution by using N-doped sludge biochar (NSBC)

Method used

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  • Method for synchronously removing heavy metal-organic matter combined pollution
  • Method for synchronously removing heavy metal-organic matter combined pollution
  • Method for synchronously removing heavy metal-organic matter combined pollution

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Example 1 Preparation of N-doped sludge biochar

[0041] 1) Take municipal sludge from Guangzhou Datansha Sewage Treatment Plant and dry it in a drying oven at 100°C to constant weight, so that the sludge can be completely dehydrated.

[0042] 2) The dried sludge is ground and passed through a 200-mesh (sludge particle size is about 75 μm) wooden sieve, collected in a cloth bag and stored in a desiccator for subsequent pyrolysis.

[0043] 3) Mix urea and sludge into 300mL of ethanol according to the mass ratio of 1:2 (wherein the quality of urea and sludge is not less than 40g, not higher than 120g), ultrasonically for 30min, so that urea and sludge are in ethanol. Mix thoroughly.

[0044] 4) After ultrasonication, the mixture was stirred in a constant temperature water bath at 35°C for 8 hours to completely volatilize the ethanol; the remaining urea and sludge mixture were collected in a bag and placed in a desiccator for preservation.

[0045] 5) Take the sludge and...

Embodiment 2

[0047] Example 2 Experiment of Simultaneous Removal of Cu and Sulfadiazine Composite Pollution in Wastewater with N-doped Sludge Biochar

[0048] In order to explore the optimal removal performance of N-doped sludge biochar for the removal of heavy metals and sulfadiazine composite pollution in wastewater, Cu was selected as the target heavy metal, and the specific experimental conditions were designed as follows: take 1 g / L of Cu 2+ Mother liquor 5mL, 60mg / L SD mother liquor 16.7mL, ultrapure water 28.3mL and H 2 O 2 100 μL of the solution (commercially available 30% concentration) was added to a 100 mL serum bottle to make the Cu in the solution 2+ Concentration is 100mg / L, SD concentration is 20mg / L, H 2 O 2 The concentration was 20 mM; 0.04 g of N-doped sludge biochar was weighed and added to the serum bottle to make the NSBC concentration in the system 0.8 g / L; no buffer was added to adjust the pH.

[0049] The serum bottle was stirred at a constant speed on a magneti...

Embodiment 3

[0053] Example 3 Experiment of Simultaneous Removal of Heavy Metals and Sulfadiazine Composite Pollution in Wastewater by N-doped Sludge Biochar in the Coexistence of Multiple Heavy Metals

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Abstract

The invention belongs to the field of wastewater treatment, and discloses a method for synchronously removing heavy metal-organic matter combined pollution, which comprises the following steps: (1) preparing N-doped sludge biochar by a pyrolysis method; and (2) adding the N-doped sludge biochar and a hydrogen peroxide solution into the wastewater containing the heavy metals and the organic matters, and stirring for reaction to synchronously remove the heavy metals and the organic matters in the wastewater. The N-doped sludge biochar and the wastewater treatment method disclosed by the invention are particularly suitable for treating wastewater subjected to combined pollution of heavy metals and organic matters, the removal rate of heavy metal Cu < 2 + > within 2 hours can reach 64.8%, the removal rate of sulfadiazine reaches 100%, and meanwhile, the biotoxicity level of the wastewater is remarkably reduced.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for simultaneously removing heavy metal-organic compound pollution and a method for wastewater treatment. Background technique [0002] With the rapid development and evolution of human civilization, the degree of pollution of the ecological environment has become increasingly serious, and the impact on water resources is particularly significant. Currently, heavy metals and antibiotics are the two most important pollutants in water. With the rapid development of metal electroplating, mining, feed, pesticides and other industries, more and more heavy metal wastewater is discharged into water bodies through direct or indirect means, resulting in an increasingly serious problem of heavy metal pollution in water; antibiotics, as a new pollution It is widely used in animal husbandry and medical treatment, so the water bodies near farms and hospitals are vulne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/72C02F101/20C02F101/30C02F103/20C02F101/38C02F101/34
CPCC02F1/283C02F1/722C02F1/725C02F2101/20C02F2101/30C02F2305/023C02F2103/003C02F2103/20C02F2101/38C02F2101/34C02F2101/40
Inventor 彭星星裴向阳何宇哲汤叶涛
Owner SUN YAT SEN UNIV
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