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Treatment method of heavily-contaminated soil

A heavily polluted, land-based technology, applied in the field of land pollution control, can solve problems such as environmental secondary pollution, damage to soil fertility and soil structure, and effective use of sewage, achieving good results, short leaching time, and simple and easy treatment methods Effect

Active Publication Date: 2018-06-22
湖南创清环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the leaching restoration technology will destroy the fertility and soil structure of the soil. At the same time, if the sewage after leaching is not used effectively, it will also cause secondary pollution to the environment.

Method used

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  • Treatment method of heavily-contaminated soil
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  • Treatment method of heavily-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] see figure 1 and figure 2 , a method for controlling heavily polluted land, comprising the steps of:

[0025] Step 1: Select 1 part by weight of H 3 PO 4 , the NaOH of 1 weight part, the humic acid of 2 weight parts, the organic fertilizer of 3 weight parts, the Tween of 1 weight part, the tannic acid of 1 weight part are made into rinse agent; Wherein each component in rinse agent The concentration is: H 3 PO 4 0.05mol / L, NaOH 0.1mol / L, humic acid 0.15mol / L, organic fertilizer 0.2mol / L, Tween 0.05mol / L, tannic acid 0.05mol / L.

[0026] Step 2: Wash the contaminated soil with the above-mentioned washing agent; wherein, the volume ratio of the washing agent to the contaminated soil is 6:1, and the washing time is 5 hours. After the sludge is treated by the washing device 1, the The discharge pipe 2 enters the storage chamber 3 for reuse;

[0027] Step 3: Precipitate the washed sewage; push the sludge deposited on the filter screen 5 at the bottom of the sewage sed...

Embodiment 2

[0034] The difference from Example 1 is that in this example, 1.5 parts by weight of H 3 PO 4 , the NaOH of 2 weight parts, the humic acid of 2 weight parts, the organic fertilizer of 2 weight parts, the Tween of 0.5 weight part, the tannic acid of 1.5 weight part are made into rinse agent; Wherein the concentration of each component is: h 3 PO 4 0.1mol / L, NaOH 0.1mol / L, humic acid 0.1mol / L, organic fertilizer 0.4mol / L, Tween 0.1mol / L, tannic acid 0.1mol / L. The volume ratio of leaching agent to polluted soil is 10:1, and the leaching time is 7 hours. Mechanical dehydration, heating and drying to a moisture content of 70%. During the pyrolysis process, nitrogen with a flow rate of 80ml / min is used as a protective gas. The pyrolysis temperature is 400°C and the heating rate is 5°C / min. The pyrolyzed biochar is put into Activated carbon is prepared by activation in the activation device, and the activator in the activation device uses H 3 PO 4 , the mass ratio of biochar t...

Embodiment 3

[0038] The difference from Example 1 is that 0.5 parts by weight of H 3 PO 4 , the NaOH of 2 weight parts, the humic acid of 2 weight parts, the organic fertilizer of 1.5 weight parts, the Tween of 2 weight parts, the tannic acid of 1 weight part are made into rinse agent; Wherein each component in rinse agent The concentration is: H 3 PO 4 0.1mol / L, NaOH 0.1mol / L, humic acid 0.2mol / L, organic fertilizer 0.2mol / L, Tween 0.05mol / L, tannic acid 0.1mol / L. The volume ratio of leaching agent to polluted soil is 8:1, and the rinsing time is 6 hours. The activator in the activation device uses ZnCl2 with a concentration of 0.1mol / L, the mass ratio of biochar to activator is 10:6, and the activation temperature is 1000°C; apply bioactivated carbon with a volume ratio of 4% to the above-mentioned mixed backfill soil Carry out active carbon-microbial combined treatment and restoration to it, and plant economic plants in the mixed soil, and the rest of the steps are the same as in E...

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Abstract

The invention discloses a treatment method of heavily-contaminated soil. The treatment method comprises the steps that H3PO4, NaOH, humic acid, organic fertilizers, polysorbate and tannic acid are selected to be compounded into a leaching agent to leach the contaminated soil; sewage obtained after leaching is precipitated, precipitated sludge is dried, pyrolyzed and activated, microbial strains are added, and then biological activated carbon is prepared; and fertility detection, heavy metal detection and soil structure detection are conducted on the leached soil, according to the detection results, the leached soil is fertilized appropriately, or the leached soil and the contaminated soil are subjected to mixing backfilling according to a certain proportion so as to reach the quality standards of different soil environments, the biological activated carbon is applied to the soil subjected to mixing backfilling, and thus activated carbon and microorganism combined treatment and remediation are conducted on the soil. The treatment method is simple and easy to carry out, and the cost is low; and the sewage obtained after leaching is treated and then directly prepared into the activated carbon, the treatment method can be used for treatment of the contaminated soil, and leached metal can be fixed, so that secondary pollution is avoided, and full utilization of the whole contaminated soil is achieved.

Description

technical field [0001] The invention belongs to the technical field of land pollution treatment, and in particular relates to a treatment method for heavily polluted land. Background technique [0002] As an indispensable basis for human survival, soil is an indispensable material wealth in our lives. The use and protection of soil resources are closely related to each of us. However, due to the rapid growth of population and the rapid development of industry, solid waste and hazardous waste water are continuously piled and dumped on the soil surface, which has caused serious pollution to the soil, and harmful gases and floating dust in the atmosphere have also continued to fall into the soil with rain. , leading to soil pollution. At the same time, due to the extensive use of chemical fertilizers in agricultural production, heavy metals and inorganic components in chemical fertilizers are precipitated in the soil and undergo complex reactions with some substances in the so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/00B09C1/10C02F11/12C02F11/10
CPCB09C1/00B09C1/02B09C1/10B09C1/105C02F11/10C02F11/12C02F2303/06Y02W10/40
Inventor 周智罗伟吴贤波雷继雨刘玉强周南万俊
Owner 湖南创清环境技术有限公司
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