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Method for treating copper-containing wastewater by utilizing spartina-alterniflora-loisel-based charcoal

A technology of Spartina alterniflora and biochar, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. The effect of plant resource utilization and improving adsorption capacity

Inactive Publication Date: 2014-09-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biochar obtained by pyrolysis under the traditional nitrogen atmosphere is not ideal for the adsorption of heavy metal copper. Therefore, it is of great significance to improve the preparation process and improve the adsorption performance of heavy metal copper in biochar.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method utilizing Spartina alterniflora-based biochar to treat copper-containing wastewater, comprising the following steps:

[0020] a. Wash Spartina alterniflora with water, dry it, place it in a tube furnace, heat it to 700°C at a rate of 4°C / min in a carbon dioxide atmosphere with a flow rate of 100mL / min and pyrolyze it, and stay for 2 hours to obtain Alternaria Spartina-based biochar for standby;

[0021] b. Prepare copper-containing wastewater with a volume of 2L and an initial concentration of 100mg / L (equivalent to Cu content) and put it into a glass bottle, and use nitric acid solution to adjust the initial pH value to 5;

[0022] c. Add the Spartina alterniflora-based biochar obtained in step a to the glass in step b, wherein the dosage of Spartina alterniflora-based biochar is 1g / L, then seal the glass and place it in a rotary mixer After reacting in medium for 60h, sample 10mL and filter it with 0.45μm cellulose acetate filter membrane to measure the cont...

Embodiment 2

[0025] The difference between this example and Example 1 is that the initial pH value of copper-containing wastewater is 6. After treatment, the adsorption capacity of Spartina alterniflora-based biochar to heavy metal copper reaches 75mg / g, which is higher than that of biochar prepared in nitrogen atmosphere. About 50%.

Embodiment 3

[0027] The difference between this example and Example 1 is that the initial pH value of copper-containing wastewater is 4. After treatment, the adsorption capacity of Spartina alterniflora-based biochar to heavy metal copper reaches 70mg / g, which is higher than that of biochar prepared in nitrogen atmosphere. About 40%.

[0028] It is known from the above examples that the use of carbon dioxide atmosphere to prepare Spartina alterniflora-based biochar can significantly improve its removal efficiency for heavy metal copper.

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Abstract

The invention discloses a method for treating copper-containing wastewater by utilizing spartina-alterniflora-loisel-based charcoal. The method comprises the following implementation steps: washing and drying spartina alterniflora loisel, screening to 100 meshes, placing into a tubular furnace, heating at the temperature rising velocity of 4 DEG C / min to 300-700 DEG C in the presence of carbon dioxide at the flow rate of 80-120mL / min, and remaining for 2 hours; adjusting the initial pH value of copper-containing wastewater to be 3-6; adding spartina-alterniflora-loisel-based charcoal into the copper-containing wastewater, wherein the charging quantity of the charcoal is 1g / L, the initial concentration of the content of copper converted by the copper-containing wastewater is 50-100mg / L, and the reaction time is 0.5-96 hours. The method for treating the copper-containing wastewater by utilizing the spartina-alterniflora-loisel-based charcoal, which is disclosed by the invention, has the advantages that the gap structure and the specific surface area of the spartina-alterniflora-loisel-based charcoal are improved; the decomposition of inorganic carbonate in the charcoal is inhibited, so that the maximal adsorption capacity of heavy metal copper by the spartina-alterniflora-loisel-based charcoal is improved to 90mg / g, and is higher than that of the charcoal prepared in the presence of nitrogen by around 50%, and meanwhile, the problem of invasive plant resource utilization is also solved.

Description

technical field [0001] The invention relates to an adsorption treatment process for copper-containing wastewater, in particular to a method for treating copper-containing wastewater by using Spartina alterniflora-based biochar. Background technique [0002] Copper is the most common and widely used toxic heavy metal, which mainly comes from industrial wastewater such as metal processing, electroplating, papermaking, oil refinery mud, wood preservatives, and chemical fertilizers. Copper is an essential trace element for life, but excessive copper is harmful to human body, animals and plants. Excessive intake of copper by the human body can cause liver and central nervous system poisoning, and copper salts are more toxic, and 10g of copper salts can be fatal. When the copper content in the water reaches 0.01mg / L, it will obviously inhibit the self-purification of the water body. If it exceeds 3mg / L, there will be peculiar smell, and if it exceeds 15mg / L, it will not be drinka...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01J20/20B01J20/30
Inventor 汪洋牛可马显龙陈俊宇陈雯刘强
Owner SHANGHAI UNIV
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