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Method for repairing heavy metal polluted soil

A technology of polluted soil and remediation method, applied in the restoration of polluted soil, etc., can solve problems such as adverse effects on soil fertility and unsatisfactory passivation effect, and achieve the goal of taking into account restoration efficiency, improving passivation rate, and taking into account passivation rate Effect

Active Publication Date: 2020-01-24
云南中钛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic and organic passivators have fast remediation speed and high passivation rate, but will have adverse effects on soil fertility
Although microbial passivators can avoid reducing soil fertility, the passivation effect is not ideal

Method used

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  • Method for repairing heavy metal polluted soil
  • Method for repairing heavy metal polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The soil in a titanium mining area was selected for restoration. The pollution of the soil is shown in Table 1.

[0043] Preparation of biochar:

[0044] Dry the rice straw, grind it into powder, put it into a horse boiling furnace, and heat it to 700°C for 2 hours to decompose.

[0045] Repair method:

[0046] first step,

[0047] Mix 1.5g / m of biochar into the soil 3 , while adding water until the water content reaches 45%, stir well, and cultivate for 40 days.

[0048] second step,

[0049] Then add bacteria solution 20L / m 3 Soil and calcium phosphate 5g / m 3 Soil, the concentration of bacteria solution is 2×10 8 CFU Escherichia coli / mL, continue to culture for 60 days, and turn over every other day during this period.

Embodiment 2

[0051] Contaminated soil and biochar sources are the same as in Example 1, and the remediation method is:

[0052] first step,

[0053] Mix 2.0g / m of biochar into the soil 3 , while adding water until the water content reaches 50%, stir well, and cultivate for 35 days.

[0054] second step,

[0055] Then add bacteria solution 35L / m 3 Soil and calcium phosphate 6.5g / m 3 Soil, the concentration of bacteria solution is 2.5×10 8 CFU Escherichia coli / mL, continue to culture for 75 days, and turn over every other day during this period.

Embodiment 3

[0057] Soil source is with embodiment 1.

[0058] Preparation of biochar:

[0059] Dry the rice straw, grind it into powder, put it into a horse boiling furnace, and heat it to 450°C for 2 hours to decompose.

[0060] The fix is:

[0061] first step,

[0062] Mix 2.0g / m of biochar into the soil 3 , while adding water until the water content reaches 50%, stir well, and cultivate for 35 days.

[0063] second step,

[0064] Then add bacteria solution 35L / m 3 Soil and calcium phosphate 6.5g / m 3 Soil, the concentration of bacteria solution is 2.5×10 8 CFU Escherichia coli / mL, continue to culture for 75 days, and turn over every other day during this period.

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Abstract

The invention relates to a method for repairing heavy metal polluted soil. The repairing method comprises the following steps: mixing biochar into soil, performing culturing for 30-40 days, adding bacterial liquid and calcium phosphate into the soil, and continuing culturing for 60-90 days, wherein the adding amount of the biochar is 1.5-2.5g in each cubic meter of the soil, the adding amount of the bacterial liquid is 20-50L in each cubic meter of the soil, the concentration of the bacterial liquid is (2-3)*10<8> CFU / mL, the adding amount of the calcium phosphate is 5-8g in each cubic meter of the soil, and the bacterial liquid comprises at least one selected from enterobacter, bacillus and lactococcus. The method is environmentally friendly and ecological, the removal rate is artificially controllable, cost is far lower than cost of the prior art, operability is greatly higher than operability of the prior art, and a good heavy metal passivation effect can be achieved. In addition, fertility of original soil can be kept, and even fertility can be improved.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a repair method for heavy metal polluted soil. Background technique [0002] Titanium ore is one of the mineral resources with very important economic value. After being mined, it can be used to make high-titanium slag, titanium dioxide, acid slag, titanium tetrachloride, titanium sponge, titanium alloy and other products. With the extensive mining of titanium ore, the environmental pollution it brings has also been paid attention to, especially the soil heavy metal pollution caused by the mining process. The pollution caused by its production process to the soil mainly includes copper, zinc, chromium, lead and so on. [0003] At present, there are mainly passivation and removal methods for the treatment of heavy metal-contaminated soil. The passivation method is to add a passivating agent to the soil to change the heavy metal from an active state to a stable state, redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/10
Inventor 方树坡
Owner 云南中钛科技有限公司
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