Multi-plant combined remediation method for arsenic-containing pesticide and/or pentachlorophenol (PCP) contaminated soil

A technology for joint remediation and contaminated soil, applied in the field of soil organic pollutant treatment, can solve the problems of long remediation period of arsenic-containing pesticides and/or pentachlorophenol, high cost of remediation methods, and poor practical application effect

Active Publication Date: 2019-12-03
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of the existing phytoremediation methods for arsenic-containing pesticides and / or pentachlorophenol with long repair period, poor practical application effect, and high cost of other repair methods, the present invention provides a kind of arsenic-containing pesticide and / or pentachlorophenol-contaminated soil. Multi-Plant Restoration Method

Method used

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  • Multi-plant combined remediation method for arsenic-containing pesticide and/or pentachlorophenol (PCP) contaminated soil
  • Multi-plant combined remediation method for arsenic-containing pesticide and/or pentachlorophenol (PCP) contaminated soil
  • Multi-plant combined remediation method for arsenic-containing pesticide and/or pentachlorophenol (PCP) contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The remediation object of this embodiment is pentachlorophenol-contaminated soil, which is collected from an abandoned pentachlorophenol production workshop of a chemical plant in Changsha City. The specific steps of the phytoremediation method are:

[0019] Soil pretreatment:

[0020] Excavate 375 kg of pentachlorophenol compound polluted soil, measure the initial pH value of the soil to be acidic, add lime, mix well, adjust the pH value to 8, and measure the pentachlorophenol content to be 9.75mg / kg;

[0021] Be that 50cm, deep 45cm gallon pot experiment is carried out with diameter, each pot is loaded with 25kg pentachlorophenol contaminated soil, a treatment group is set, four control groups, every group is set three parallel experiments, totally 15 pots;

[0022] sowing:

[0023] Treatment group: plant 3 centipede grasses in every pot, the spacing is 35cm, weigh 3 g of clover seeds and 3 g of clover seeds, drill the clover seeds and clover seeds alternately, and s...

Embodiment 2

[0038] The restoration object of this embodiment is pentachlorophenol-contaminated soil, which is collected from the soil on the ground in the waste pentachlorophenol production workshop of an abandoned chemical factory in Zhuzhou City. The specific steps of the phytoremediation method are:

[0039] Soil pretreatment:

[0040] First, remove the hardened ground in the workshop, and remove bricks and cement blocks that are not suitable for plant growth;

[0041] Select 600m 2 Contaminated soil, test the content of pentachlorophenol in the soil and the pH value of the soil, adjust the pH value of the soil to 8 with lime, and then test the content of pentachlorophenol to 7.7mg / kg;

[0042] Divide into two small plots, set up treatment group and control group, each set up 3 parallel experiments;

[0043] sowing:

[0044] Treatment group: the sowing rate of small flying canopy is 2 kg / mu, the sowing rate of clover is 2 kg / mu, and centipede grass is transplanted with seedlings, 1200...

Embodiment 3

[0056] The remediation object of this embodiment is compound polluted soil containing arsenic pesticides and pentachlorophenol, which is collected from the soil polluted by discarded pesticides in paddy fields. The specific steps of the phytoremediation method are:

[0057] Soil pretreatment:

[0058] Remove the debris on the ground, remove bricks, cement blocks, etc. that are not suitable for plant growth;

[0059] Select 1500m 2 Contaminated soil, test the soil pH value, adjust the soil pH value to 8 with lime, and detect the contents of arsenic-containing pesticides and pentachlorophenol in the soil are 50.5mg / kg and 7.7mg / kg respectively;

[0060] Divide into five plots, set one treatment group and four control groups, which are control groups 1-4 respectively; set 3 parallel experiments in each group;

[0061] sowing:

[0062] Treatment group: the sowing rate of small flying canopy is 3 kg / mu, the sowing rate of clover is 1.5 kg / mu, and centipede grass is transplanted ...

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Abstract

The invention provides a multi-plant combined remediation method for arsenic-containing pesticide and / or pentachlorophenol (PCP) contaminated soil. Selected plants are pteris vittata, conyza canadensis and clover. The multi-plant combined remediation method comprises the following steps that the soil pH value is detected; the pH value is adjusted to be within 6.5-8.5 through lime; the plants are planted on the contaminated soil, the pteris vittata and the conyza canadensis are sowed in line alternately, clover seeds are subjected to even broadcast sowing, the overground parts of the plants areharvested each year, the harvested plants are incinerated, obtained ash is subjected to harmless disposal, with year as the remediation cycle, repeated harvesting and incineration are conducted, andremediation is completed till the content of arsenic-containing pesticides and PCP in the contaminated soil reach the value below the national standard limit value. In the multi-plant combined remediation method, the pteris vittata mainly enriches the arsenic-containing pesticides, the conyza canadensis and the clover are mainly used for remediating PCP pollution, a high-medium-low three-layer three-dimensional structure is formed, the plant growing space is fully utilized, the biomass is increased, and the remediation is increased; and symbiotic nitrogen-fixing bacteria of the clove providesnitrogen for growing of other plants and can further accelerate remediation.

Description

technical field [0001] The invention relates to the technical field of soil organic pollutant treatment, in particular to a multi-plant combined restoration method for soil polluted by arsenic-containing pesticides and / or pentachlorophenol. Background technique [0002] Both arsenic-containing pesticides and pentachlorophenol have insecticidal and bactericidal effects. Individual and combined pollution of these two pesticides often exists, and they enter the food chain along with water, air, and food, causing serious health problems to people. Arsenic-containing pesticides refer to organic compound pesticides containing arsenic elements, and also contain some inorganic arsenic. The main varieties are Daojiaoqing, Daoning, Tianan, methylsulfurarsenic, etc. Such pesticides and their decomposition products are harmful to humans and animals. It has high toxicity and is easy to accumulate in soil and agricultural products. Gastrointestinal symptoms are common in the early stage ...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/105
Inventor 王贤芳邢汉君蒋俊
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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