Ecological method for restoring polycyclic aromatic hydrocarbon polluted farmland soil

A polycyclic aromatic hydrocarbon and farmland technology is applied in the ecological field of remediation of polycyclic aromatic hydrocarbon-contaminated farmland soil, and can solve problems such as the inability to effectively guarantee the safety of the underlying soil, the poor controllability of the remediation process and effect, and the poor technical operability, etc. To achieve the effect of ensuring normal income, low price and low cost

Inactive Publication Date: 2010-08-11
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for large-area and low-concentration polycyclic aromatic hydrocarbon farmland pollution, the above-mentioned physical and chemical methods have great deficiencies and are difficult to apply. The main reasons are: 1. The physical and chemical methods to control polluted soil have high remediation costs and are economically very expensive. It is unbearable and not suitable for the treatment of farmland soil; 2. When it is applied to farmland soil remediation, the technical operability is also poor, and the controllability of the remediation process and effect is poor; 3. Physical and chemical methods are not effective in the specific implementation process There may be secondary pollution, and the safety of groundwater and subsoil around the farmland cannot be effectively guaranteed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Ecological Restoration Area: Located in the suburb of Fushun City, Liaoning Province, because it is located at the junction of urban and rural areas, there are many small factories around, and the soil is polluted by polycyclic aromatic hydrocarbons. The average content of polycyclic aromatic hydrocarbons is 4622 μg / kg.

[0016] 1. Selection of restoration plants. The ecological restoration plants use corn, which is widely planted by local farmers and is the main source of agricultural economy. The planting area accounts for more than 70% of the local farmland. The corn growing season is from May 10 to September 30, a total of 140 days.

[0017] 2. Apply high-efficiency microbial agents. The so-called high-efficiency microbial agent is a field-applied agent obtained by multiplying a variety of highly efficient polycyclic aromatic hydrocarbon-degrading bacteria in a matrix with corncobs and soybean bran as raw materials for 5 days. The high-efficiency microbial agent w...

Embodiment 2

[0023] Ecological Restoration Area: Located in Dongling District, Shenyang City, Liaoning Province, this area belongs to the Shenfu sewage irrigation canal area, and the average content of polycyclic aromatic hydrocarbons is 3522 μg / kg.

[0024] 1. Selection of restoration plants. Soybean is selected as the ecological restoration plant, and the plant growth period is from May 15 to October 5, a total of 140 days.

[0025] 2. Apply high-efficiency microbial agents. The so-called high-efficiency microbial agent is a field-applied agent obtained by multiplying a variety of highly efficient polycyclic aromatic hydrocarbon-degrading bacteria in a matrix with corncobs and soybean bran as raw materials for 3 days. The high-efficiency microbial agent was applied to the farmland 10 days before soybean sowing, that is, on May 5, with an application rate of 50 kg / mu. On May 6, the farmland was plowed with a tiller.

[0026] 3. Apply sludge fermentation fertilizer. The so-called sludge...

Embodiment 3

[0030] Ecological Restoration Area: Located in Wanghua District, Fushun City, Liaoning Province, which is a typical urban-rural integration zone, the content of polycyclic aromatic hydrocarbons is 4897 μg / kg.

[0031] 1. Selection of restoration plants. Castor is used as the ecological restoration plant, and the plant growth period is from May 10 to September 30, a total of 140 days.

[0032] 2. Apply high-efficiency microbial agents. The so-called high-efficiency microbial agent is a field-applied agent obtained by multiplying a variety of polycyclic aromatic hydrocarbon-degrading bacteria in a matrix with corncobs and soybean bran as raw materials for 7 days. The high-efficiency microbial bacterial agent was applied to the farmland 5 days before castor sowing, that is, on May 5th, and the application rate was 50 kg / mu, and the farmland was plowed with a tiller immediately after application.

[0033] 3. Apply sludge fermentation fertilizer. The so-called sludge fermentatio...

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Abstract

The invention provides an ecological method for restoring polycyclic aromatic hydrocarbon polluted farmland soil, which comprises the following steps: selecting plants such as corns, soybean, castor-oil plants and alfalfa with the restoring function of the polycyclic aromatic hydrocarbon polluted soil for seeding according to a plant conventional mode, wherein the plant growth period is one growth season and is between 100 and 150 days; 2, applying efficient biological microbial agents to farmland at 5 to 10 days before the plant seeding with the application amount between 40 to 50 kg/mu, and carrying out ploughed fallow on the farmland in 24 hours after the application; 3, applying sludge fermentation fertilizer into the farmland at 2 to 3 days before the plant seeding with the application amount of 100 to 200 kg/mu, and carrying out ploughed fallow and ridge preparation on the land in 24 hours after the application; and 4, installing a water discharge pump used for water discharge in a rain reason in the restoring field every 4 to 5 ridges of the land, and carrying out ploughed fallow for 2 to 3 times in each month of the three months before the plant growth. The invention has the characteristics of low cost, strong operability, no secondary pollution and high restoring efficiency.

Description

Technical field: [0001] The invention relates to an ecological restoration method for farmland soil polluted by polycyclic aromatic hydrocarbons, and mainly relates to phytoremediation of farmland soil polluted by low-concentration polycyclic aromatic hydrocarbons and related ecological restoration control measures. Background technique: [0002] Polycyclic aromatic hydrocarbons (PAHs) are one of the most common organic pollutants, which have strong carcinogenic, teratogenic and mutagenic effects. Due to its low solubility and strong hydrophobicity, it can be strongly distributed into soil organic matter, and soil has become an important destination of polycyclic aromatic hydrocarbons, bearing more than 90% of its environmental load. After entering the soil, polycyclic aromatic hydrocarbons can enter other environmental media and organisms through volatilization, migration, and food chains, thereby posing risks to human health. Therefore, the remediation of polycyclic aromat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 王洪李海波王鑫李英华邹轶
Owner SHENYANG UNIV
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