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Method for repairing heavy metals in sludge substrate by biomass charcoal and complexing agents

A technology of biochar and complexing agent, applied in the direction of carbon preparation/purification, restoration of polluted soil, etc., can solve problems such as environmental pollution, lagging disposal methods, waste of biomass energy, etc., and achieve the effect of broad application prospects

Inactive Publication Date: 2014-11-26
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, biochar, as a new type of environmental functional material, has attracted widespread attention. It has shown application potential in soil improvement, greenhouse gas emission reduction, and remediation of polluted environments, but there are few reports on the remediation of urban sludge with synergistic complexing agents.
China is a large agricultural country with abundant straw resources, but the current disposal method is still lagging behind. A large amount of straw is discarded in the field or directly burned, which not only causes a lot of waste of biomass energy, but also brings serious pollution to the environment.

Method used

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  • Method for repairing heavy metals in sludge substrate by biomass charcoal and complexing agents
  • Method for repairing heavy metals in sludge substrate by biomass charcoal and complexing agents
  • Method for repairing heavy metals in sludge substrate by biomass charcoal and complexing agents

Examples

Experimental program
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Effect test

Embodiment 1

[0064] (1) Mix soil and air-dried sludge at a ratio of 1:2 to form a culture substrate; 0.05 mm particle size biochar for later use;

[0065] (2) Evenly mix the biochar and the culture medium according to the weight ratio of 1:20 and 1:40, and put them into a PVC pipe. A cotton cloth and a nylon mesh with a diameter of 0.2 mm are fixed at the bottom of the PVC pipe for support. To remove the soil and sludge in the pipe, lift the pipe, and the bottom of the pipe is equipped with leachate;

[0066] (3) After the matrix was filled, 0.6 g of ryegrass seeds were sown in the tubes, and watered with tap water to keep the overall field water capacity at 60%. During the planting period, the indoor temperature and relative humidity were 25°C and 40%, respectively, and the light intensity was 500 μmol?m -2 ?s -1 .

[0067] (4) 30 days after sowing, the concentration was 10 mmol·kg -1 DTPA and 10 mmol·kg -1 The aqueous solution of EDTA was applied to the substrate surface respective...

Embodiment 2

[0072] (1) Mix the soil and air-dried sludge in a ratio of 1:2 to form a culture substrate of 0.1 mm particle size biochar for later use;

[0073] (2) Evenly mix the biochar and the culture medium according to the weight ratio of 1:20 and 1:40, and put them into a PVC pipe. A cotton cloth and a nylon mesh with a diameter of 0.2 mm are fixed at the bottom of the PVC pipe for support. To remove the soil and sludge in the pipe, lift the pipe, and the bottom of the pipe is equipped with leachate;

[0074] (3) After the matrix was filled, 0.6 g of ryegrass seeds were sown in the tubes, and watered with tap water to keep the overall field water capacity at 60%. During the planting period, the indoor temperature and relative humidity were 25°C and 55%, respectively, and the light intensity was 600 μmol?m -2 ?s -1 .

[0075] (4) 30 days after sowing, the concentration was 10 mmol·kg -1 DTPA and 10 mmol·kg -1 The aqueous solution of EDTA was applied to the substrate surface respe...

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Abstract

The invention discloses a method for repairing heavy metals in a sludge substrate by biomass charcoal and complexing agents, wherein the complexing agents are 10 mmol.kg<-1>DTPA (diethylenetriamine pentaacetic acid) and 10 mmol.kg<-1>EDTA (ethylene diamine tetraacetic acid); and the biomass charcoal comes from the finished products prepared from 0.01-0.1 mm farmland wastes, straws or saw dust. Via the environment-friendly type adsorbent biomass charcoal with a wide application prospect, which is prepared from the wastes (comprising the main ingredients of straws and saw dust) during agricultural production, a novel route is explored for cyclic utilization for organic wastes, the adsorption characteristic of biomass charcoal for heavy metals in a condition of adding different complexing agents is researched, the leaching characteristic of heavy metals is recognized in a simulated rainfall condition, and a technical support is provided for heavy-metal pollution control applications for sludge.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the research on complexing agent-enhanced phytoremediation of polluted soil, in particular to a method for repairing heavy metals in sludge matrix by using biomass charcoal synergistic complexing agent. Background technique [0002] Sludge resource utilization is to improve the composition and partial properties of sludge through various physical, chemical and biological methods and processes, so that the valuable components in sludge can be directly or recombined or converted into other forms of energy And be recycled. Urban sludge resource technology mainly includes land utilization, sludge fuelization and building material utilization. Sludge contains a large amount of inorganic substances, accounting for about 20%-30%, mainly silicon, iron, aluminum and calcium. Therefore, sludge can be used as raw material to produce building materials and cement, etc., and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00C01B31/02C01B32/05
Inventor 多立安赵树兰沈志平
Owner TIANJIN NORMAL UNIVERSITY