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Application of zero-valent iron-loaded biochar in wastewater treatment

A biochar, zero-valent iron technology, applied in metallurgical wastewater treatment, water/sewage treatment, reductive water/sewage treatment, etc., can solve the problems of rising cost, low concentration range of heavy metals and organic compounds, etc., and achieve a good ability to treat wastewater. , the effect of easy recycling

Active Publication Date: 2020-08-25
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although nano-zero-valent iron has a significant effect on the removal of heavy metals or organic pollutants, there are few studies on the synergistic treatment of heavy metals and organic pollutants by nano-zero-valent iron.
Some scholars have suggested that adding nanometer zero-valent iron and persulfate to heavy metal and organic pollution wastewater can achieve better removal effect, but the concentration range of heavy metal and organic matter is low, and persulfate is added, which leads to an increase in cost
In addition, few people are able to utilize the heavy metals in the water in the process of treating heavy metals and organic wastewater, reduce costs, improve removal efficiency, and achieve the purpose of treating waste with waste

Method used

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  • Application of zero-valent iron-loaded biochar in wastewater treatment
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  • Application of zero-valent iron-loaded biochar in wastewater treatment

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preparation example Construction

[0028] The preparation method of biochar loaded with zero-valent iron is as follows:

[0029] Under the condition of inert gas, add biochar into the solution of iron salt and stir evenly, then add reducing agent, which will reduce divalent or ferric iron ions in iron salt to zero-valent iron, that is, elemental iron. The valence iron was loaded on the biochar to obtain a black solid, which is the biochar loaded with zero-valent iron. The black solid was washed with ethanol, and then stored in a brown bottle under a nitrogen atmosphere.

[0030] Wherein, the solvent in the solution is distilled water. The mass ratio of the iron element in the biochar to the iron salt is 1:1-2:1. On the one hand, it ensures that the nano-zero-valent iron can be fully loaded on the bio-char, and on the other hand, it ensures the concentration of the nano-zero-valent iron in the prepared material. The content is higher.

[0031] The black solid was washed with ethanol to prevent the oxidation of...

Embodiment 1

[0047] Co-treatment of electroplating wastewater and organic wastewater using biochar loaded with zero-valent iron, that is, to Cu 2+ or Ni 2+ The mixed water with 2,4-DCP is added with biochar loaded with zero-valent iron to remove heavy metals and organic pollutants.

[0048] The specific steps are: use a 1000ml beaker as the reactor, and treat 20ml of Cu 2+ (4000mg / L) and 380ml of 2,4-DCP (20mg / L) mixed solution (organic pollution wastewater: electroplating wastewater=19:1, v:v), Cu in the final mixed solution 2+ and 2,4-DCP concentrations were 200mg / L and 19mg / L, and the pH of the mixed water was adjusted to 5. Then add the biochar loaded with zero-valent iron prepared in the laboratory, so that the content in the mixed water body is 0.6g / L. The solution in the reactor was stirred at a rotational speed of 150 rpm, and the reaction time was 60 min. The specific results are shown in Table 1.

Embodiment 2

[0050] A 1000ml beaker is used as the reactor, and the processing object is 400ml Cu 2+ (200mg / L), adjust the pH of the water to 5. Then add the biochar loaded with zero-valent iron prepared in the laboratory, so that the concentration in the mixed water body is 0.6g / L. The solution in the reactor was stirred at a rotational speed of 150 rpm, and the reaction time was 60 min. The specific results are shown in Table 1.

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Abstract

The invention belongs to the technical field of environmental protection and industrial emission reduction and provides an application of zero-valent iron-loaded biochar in wastewater treatment. According to the application, zero-valent iron-loaded biochar is added into wastewater containing metal ions, wherein the wastewater is electroplating wastewater or a mixture of the electroplating wastewater and organic wastewater, the reduction potential of the metal ions is higher than that of zero-valent iron, the metal ions are reduced into elementary substances by the nano zero-valent iron, the elementary substances and elementary substance iron on the biochar form a multi-metal composite material, and organic matters are efficiently catalyzed to be degraded; and meanwhile, the electroplatingwastewater and the organic polluted wastewater are mutually diluted, so that the aim of treating wastes with wastes is fulfilled; the zero-valent iron loaded biochar has magnetism, can be convenientlyrecycled by an electromagnet, and still has good treatment capacity after being repeatedly used. The application of the zero-valent iron-loaded biochar in wastewater treatment achieves a good effectin wastewater treatment; and the material has magnetism and is easy to recycle, so that the zero-valent iron-loaded biochar has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and industrial emission reduction, and in particular relates to the application of biochar loaded with zero-valent iron in wastewater treatment. Background technique [0002] Electroplating wastewater mainly includes: cyanide-containing wastewater, nickel-containing wastewater, chromium-containing wastewater, acid-base wastewater, comprehensive wastewater, cadmium-containing wastewater, copper-containing wastewater, gold-containing wastewater, and silver-containing wastewater. In addition to various heavy metals, it also contains various surfactants, citric acid, EDTA, cyanide, acetylene glycol, coumarin, etc. These substances are difficult to degrade after entering the environment, and will exist in nature for a long time, and will be enriched in organisms through the food chain, causing poisoning, cancer, distortion, mutation, etc. Therefore, the treatment of electroplating was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/30C02F101/34C02F101/36C02F101/38C02F103/16
CPCC02F1/705C02F2101/345C02F2101/36C02F2101/38C02F2101/30C02F2103/16
Inventor 时鹏辉许吉宏王鹏飞陆可人杨玲霞范金辰闵宇霖徐群杰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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