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A method of using biochar to control combined pollution of hexavalent chromium and organic pollutants

A technology of organic pollutants and compound pollution, which is applied in the field of biochar treatment of compound pollution of hexavalent chromium and organic pollutants, can solve the problems of poor compound pollution control effects, achieve low manufacturing costs, improve treatment efficiency, and avoid secondary pollution Effect

Active Publication Date: 2020-06-02
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for using biochar to control the compound pollution of hexavalent chromium and organic pollutants, which uses the biochar obtained by a specific preparation process as a repair agent and a catalyst, in the Under a certain concentration of hexavalent chromium and acidic environment, the reduction of biochar and the surface defect sites are used to promote the reduction of hexavalent chromium and the degradation of organic pollutants, and realize the efficient control and protection of combined pollution of hexavalent chromium and organic pollutants. treatment, thereby solving the technical problem that hexavalent chromium inhibits the degradation of organic pollutants in the combined pollution treatment of hexavalent chromium and organic pollutants in the prior art, and the combined pollution treatment effect is poor

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  • A method of using biochar to control combined pollution of hexavalent chromium and organic pollutants
  • A method of using biochar to control combined pollution of hexavalent chromium and organic pollutants
  • A method of using biochar to control combined pollution of hexavalent chromium and organic pollutants

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Effect test

Embodiment 1

[0045] A method that can simultaneously remove the combined pollution of hexavalent chromium and organic pollutants. The repair method in this implementation case is:

[0046] (1) Put 10 g of rice husk into a tube furnace and calcinate at 550 °C for 120 min under the protection of nitrogen to obtain biochar.

[0047] (2) Add the prepared biochar to the wastewater containing 100 mg / L benzoic acid and 10 mg / L hexavalent chromium at a concentration of 10 g / L, and control the pH of the reaction to be 3.

[0048] Carry out result analysis according to the repairing method of described embodiment:

[0049] figure 1 : Removal of organic pollutants benzoic acid and hexavalent chromium in complex pollution system;

[0050] figure 1 Shown in is the removal of benzoic acid and hexavalent chromium in the combined pollution system of hexavalent chromium and benzoic acid. The total volume of the reaction system is 50mL, the concentration of biochar is 10g / L, the concentration of benzoic...

Embodiment 2

[0058] (1) Put 10 g of rice husk into a tube furnace and calcinate at 800 °C for 120 min under the protection of nitrogen to obtain biochar.

[0059] (2) Add the prepared biochar to the wastewater containing 100mg / L benzoic acid and 10mg / L hexavalent chromium at a concentration of 10g / L, control the pH of the reaction to be 3, and the total volume of the reaction system to be 50mL, take out the sample Dilution was determined by liquid chromatography.

[0060] Figure 5 : Removal of benzoic acid in compound pollution system

[0061] Such as Figure 5 , where BA represents the removal of benzoic acid in the polluted system without hexavalent chromium, and BA-Cr represents the removal of benzoic acid in the polluted system with hexavalent chromium. In the composite polluted wastewater containing 10mg / L hexavalent chromium, the removal effect of biochar prepared at 800°C on benzoic acid was 72%; The degradation effect is only 60%. This result shows that hexavalent chromium ca...

Embodiment 3

[0064] (1) Put 10 g of rice husk into a tube furnace and calcinate at 550 °C for 120 min under the protection of nitrogen to obtain biochar.

[0065] (2) The prepared biochar is added to the waste water containing 400mg / L benzoic acid and 50mg / L hexavalent chromium with a concentration of 10g / L, the pH of the control reaction is 3, the total volume of the reaction system is 50mL, sampling, using The chlorobenzene in the biochar suspension was extracted by n-hexane, and the content of chlorobenzene was measured by high performance liquid chromatography. The measurement of hexavalent chromium in the biochar suspension was performed by diphenylcarbazide spectrophotometry.

[0066] Figure 6 : Removal of chlorobenzene and hexavalent chromium in complex pollution system

[0067] Such as Figure 6 As shown, where CB represents the removal of chlorobenzene without hexavalent chromium, and CB-Cr represents the removal of chlorobenzene with hexavalent chromium. When the combined po...

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Abstract

The invention belongs to the field of pollution control, and particularly relates to a method for controlling combined pollution of hexavalent chromium and organic pollutants by using biochar. The method mainly comprises the steps that the specific biochar is added into a combined pollution system of the hexavalent chromium and organic pollutants to control the pH of a reaction in acidity, after aperiod of reaction, the hexavalent chromium and organic pollutants in the combined pollution system can be simultaneously removed. The method for controlling the combined pollution of the hexavalentchromium and organic pollutants by using the biochar has the advantages that the required additive is the biochar, the source is wide, the cost is low, the preparation method is simple, and the energyconsumption is low; in addition, no additional chemical reagents are added in the repair process, thereby reducing the treatment cost, and avoiding secondary pollution caused by the use of chemical reagents. Therefore, the method has broad application prospects in environmental pollution control.

Description

technical field [0001] The invention belongs to the field of pollution control, and more specifically relates to a method for treating compound pollution of hexavalent chromium and organic pollutants by using biochar. Background technique [0002] In real industrial wastewater, more than one pollutant is usually present. For example, in electroplating wastewater and printing and dyeing wastewater, it is usually a complex pollution system in which heavy metal ions and organic pollutants coexist. At present, there are relatively few researches on the control of complex pollution systems. Traditional pollution control technologies mainly focus on the removal of a single pollutant, while other coexisting pollutants in the pollution system will make the overall treatment effect worse. Therefore, for compound pollution, a feasible solution is to gradually separate different types of pollutants into single pollutants, and then use traditional methods for treatment, which will und...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/70C02F101/22C02F101/30
Inventor 张延荣张凯凯
Owner HUAZHONG UNIV OF SCI & TECH
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