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Resource utilization method of plant bamboo reed after restoring heavy metal contaminated soil

A technology for polluted soil and heavy metals, which is applied in the restoration of polluted soil, chemical instruments and methods, separation methods, etc. secondary pollution problems, preventing diffusion, and improving the effect of surface adsorption capacity

Active Publication Date: 2013-12-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rehabilitated Arundos reticulum harvests contain a certain amount of heavy metals, which may cause secondary pollution of heavy metals if not properly disposed of.
However, the current prior art does not consider the issue of how to safely and comprehensively utilize biomass such as reed bamboo containing heavy metals

Method used

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  • Resource utilization method of plant bamboo reed after restoring heavy metal contaminated soil
  • Resource utilization method of plant bamboo reed after restoring heavy metal contaminated soil
  • Resource utilization method of plant bamboo reed after restoring heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of biochar by using the plant Arundo arundinacea that has been repaired in heavy metal contaminated soil

[0027] Harvest the aboveground parts of Arundo arundinacea containing heavy metals from the soil of a heavy metal-contaminated site. The harvest is washed with tap water and deionized water and cut into small pieces of 1-2 cm, which are dried at 105°C for 30 minutes and dried at 60°C. Put the dried small pieces of reed bamboo into the tubular lifting furnace, and spray 1mol / L sodium hydroxide solution at the same time, so that the sodium hydroxide accounts for 0.5wt% of the reed bamboo powder, and heat under the protection of nitrogen to control the calcination Calcined at a temperature of 300°C for 2 hours, and crushed to below 20 mesh after cooling to obtain a heavy metal-containing reed biochar. Under the calcination conditions, the yield of arundo biochar is about 55%, and the calorific value of biochar reaches 29.53kJ / g. There are a lot of...

Embodiment 2

[0028] Example 2: Toxicity leaching test of Arundo biochar containing heavy metals

[0029] The toxicity leaching experiment was carried out using the arundo biochar prepared in Example 1. The leaching experiment refers to the method of "Solid waste leaching toxicity leaching method horizontal oscillation method (HJ557-2010)", using water leaching and acid leaching to carry out the toxicity leaching test: take 20mL of deionized water, adjust the pH to 2.5 and 5.5, and then add 0.2g containing The heavy metal arundo biochar was shaken in a constant temperature water bath shaking box at room temperature for 24 hours, then centrifuged and filtered, and the content of As, Cd, Pb, and Zn in the supernatant was measured. At the same time, do a blank test (without biochar) to eliminate test errors. It can be seen from Table 1 that the content of heavy metals in the unpolluted Arundo biochar leaching solution is extremely low; the concentration of As, Cd, Pb, and Zn in the leaching solu...

Embodiment 3

[0033] Example 3: Absorption capacity test of Arundo biochar containing heavy metals

[0034] The Arundo biochar prepared in Example 1 (the raw material is Arundo arundinacea harvested from heavy metal-contaminated site soil) was used to carry out a simulated heavy metal adsorption test in wastewater. The test operation process is as follows: prepare a series of simulated wastewater containing As, Cd, and Pb with concentration gradients of 5 mg / L, 10 mg / L, 25 mg / L, and 50 mg / L. Add 0.2g of biochar to 20ml of simulated wastewater, then shake it at room temperature for 24h, measure the concentration of heavy metal ions in the solution after adsorption, and use the difference in solution concentration to calculate the adsorption of biochar on As, Cd, and Pb in the wastewater. The experimental results show( image 3 ), Arundo biochar has a certain adsorption effect on As, Cd and Pb in wastewater, and the adsorption effect increases with the increase of the concentration of As, Cd an...

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Abstract

The invention discloses a resource utilization method of plant bamboo reed after restoring heavy metal contaminated soil. The method comprises the following steps: air-drying and crushing the harvested plant bamboo reed used for restoring heavy metal contaminated soil, adding a catalytic modifier under a condition of controlling oxygen atmosphere, calcining the plant bamboo reed at 200-800 DEG C for 0.5-4 h, and cooling the plant bamboo reed to obtain charcoal, wherein the yield of the bamboo reed charcoal is 25-75%. When the bamboo reed charcoal is used for adsorbing heavy metals and compounds thereof in contaminated soil, wastewater or waste gases, the adsorption capacity reaches 0.4-6.0 mg / g; meanwhile, the bamboo reed charcoal can be used as an energy source raw material or a reducing agent to be comprehensively utilized by metallurgy enterprises. The invention provides an engineering approach for biomass resource utilization of contaminated soil restoring plants and solving the problem of potential secondary pollution.

Description

Technical field [0001] The invention relates to the field of comprehensive utilization of solid waste resources. Specifically, the present invention relates to a method for preparing biochar from the biomass of the remediation plant Arundinacea harvested from heavy metal contaminated soil, and at the same time using biochar to adsorb heavy metals in polluted soil, waste water or exhaust gas, as an energy material for heavy enterprises or reducing Agent method. Background technique [0002] Arundo is a perennial gramineous plant widely distributed in southern my country, with fast growth and large biomass. Reed bamboo biomass contains a large amount of cellulose and lignin, and has a high calorific value of combustion. After calcination, most of the biomass of arundo is char. Yang Haiping’s research shows that the precipitation of volatile matter during the preparation of biomass charcoal is mainly concentrated at 300-600℃; at high temperatures (> 800°C) Biomass char mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B09C1/10C02F1/28B01D53/02
Inventor 郭朝晖刘亚男柴立元肖细元
Owner CENT SOUTH UNIV
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