Composite heavy metal polluted soil conditioner as well as application and application method thereof

A technology for the improvement of polluted soil and heavy metals, which is applied in the field of compound heavy metal polluted soil conditioners, can solve the problems of secondary pollution of eluents, influences on groundwater safety, and low repair efficiency of heat treatment methods, and achieves both economic and environmental benefits and good performance. Environmentally friendly, good restorative effect

Active Publication Date: 2014-09-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Phytoremediation is recognized as an ideal in-situ soil treatment technology, but there are obvious disadvantages: hyperaccumulator plants tend to be short in size, low in biomass, slow in growth rate, and long in growth cycle; most hyperaccumulator plants can only accumulate certain Heavy metals, not suitable for complex heavy metal contaminated soil remediation; phytoremediation is limited by environmental conditions such as soil type, temperature, humidity and nutrition
The alien soil method will destroy the properties of the natural soil, and may also affect the safety of groundwater; the leaching method requires the soil to have relatively high permeabili...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Please refer to Table 1, by the following components by weight: Plant ash: 3 parts by weight; Calcium magnesium phosphate fertilizer: 12 parts by weight; Quicklime: 4 parts by weight; Zeolite: 1 part by weight, 0.08 parts by weight of hydroxyapatite and organic fertilizer: 4 parts by weight to prepare a composite heavy metal polluted soil improver. Among them, the effective mass fraction of phosphorus pentoxide in the calcium magnesium phosphate fertilizer is ≥ 12%, the mass fraction of water is ≤ 0.5%, and the fineness is ≥ 80% through a 0.25mm test sieve. The mass fraction of calcium oxide in quicklime is ≥80%. The organic matter mass fraction of organic fertilizer (based on drying basis) ≥ 40%; the mass fraction of total nutrients (nitrogen + phosphorus pentoxide + potassium oxide) (calculated on drying basis) ≥ 4.0%; moisture (fresh sample) Mass fraction ≤ 30%; acidity and alkalinity pH value is 5.5-8.5.

[0036] Select in the soil containing Cd, Zn, Cu heavy meta...

Embodiment 2

[0042] Please refer to Table 1, by the following components by weight: Plant ash: 11 parts by weight; Calcium magnesium phosphate fertilizer: 1 parts by weight; Quicklime: 21 parts by weight; Zeolite: 6 parts by weight, 0.6 parts by weight of hydroxyapatite and organic fertilizer: 12 parts by weight to prepare a composite heavy metal polluted soil improver.

[0043] Choose to use the composite heavy metal-contaminated soil improver of this embodiment in the soil containing Ag and Cd heavy metal pollution within 2 kilometers near a certain chemical plant (this area is a moderately polluted area), the addition is 40kg / mu, and the balance soil The improvement time is 10 days.

[0044] Then evenly spray the microbial functional bacterial liquid prepared by the microbial bacterial agent. The microbial bacterial agent is prepared by using comprehensive bioengineering technology, including highly effective heavy metal inhibitory microbial functional bacterial agent (liquid state) an...

Embodiment 3

[0049] Please refer to Table 1, by the following components by weight: Plant ash: 14.925 parts by weight; Calcium magnesium phosphate fertilizer: 10 parts by weight; Quicklime: 15 parts by weight; Zeolite: 1 part by weight; Hydroxyapatite 0.075 parts by weight and organic fertilizer: 59 parts by weight to prepare a composite heavy metal polluted soil conditioner.

[0050] Choose to use the composite heavy metal-contaminated soil improver of this embodiment in the soil containing Pb and Cd heavy metal pollution within 3 kilometers near the storage battery factory (this area is a lightly polluted area), and the addition amount is 200kg / mu, and the balance soil is improved The time is 14 days.

[0051] Sampling and analysis: heavy metals Pb and Cd in polluted soil are reduced to low-priced immobilized heavy metals, heavy metal precipitates or minerals, and lose their bioavailability, realizing in-situ restoration of heavy metal-contaminated soil, and the quality of the soil envir...

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PUM

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Abstract

The invention discloses a composite heavy metal polluted soil conditioner as well as application and an application method thereof. The soil conditioner comprises the following components: plant ash, calcium magnesium phosphate, quicklime, zeolite and organic fertilizers at a weight ratio of (0.3-1.1):(0.1-1.2):(0.4-2.1):(0.1-0.6):(0.008-0.06):(0.4-1.2). Through inorganic components such as quicklime, calcium magnesium phosphate and phosphate in hydroxyapatite as well as potassium carbonate in the plant ash, the soil conditioner can be used for fixing heavy metals in polluted soil and improving the fertility of the polluted soil in combination with organic manures such as the plant ash and the organic fertilizers so as to continuously intensify the restoration of the polluted soil, has the advantages of relatively-high stability, good environmental friendliness and low cost, can be used for inactivating and restoring various heavy metal polluted soil, especially has a good restoration effect on soil pollution caused by waste slag discharged by industrial and mining enterprises, can be used for realizing the treatment goal without generating secondary pollution, and is liable to realize large-area popularization.

Description

technical field [0001] The invention relates to the technical field of heavy metal polluted soil treatment, and particularly discloses a composite heavy metal polluted soil improver and its application and application method. Background technique [0002] With the increase of my country's population, the promotion of urbanization and the improvement of people's material living standards, the demand for various products processed and produced by industrial and mining enterprises has also increased rapidly. Harmful heavy metals (such as Cr, Cd, Pb, As, etc.) discharged into the environmental soil continue to increase, seriously destroying the natural ecological environment and threatening people's health, so the treatment of polluted soil is imminent. [0003] The heavy metals that pollute the soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) and other elements with significant biological toxicity, as well as zinc (Zn) and coppe...

Claims

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Application Information

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IPC IPC(8): C09K17/06C09K17/00C05G3/04B09C1/08B09C1/10C05G3/80
Inventor 陈文清侯翔刘文超
Owner SICHUAN UNIV
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