Method for remediation of phosphorus-contaminated soil

A phosphorus-polluted, soil-based technology, applied in the field of repairing phosphorus-contaminated soil, can solve problems such as limitations, high cost, and inability to fundamentally solve phosphorus pollution, and achieve the effect of low cost, easy survival, and repairing phosphorus pollution

Inactive Publication Date: 2011-01-05
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this treatment method is not only costly, but also cannot fundamentally solve the problem of phosphorus pollution, which is greatly limited in practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Present embodiment is a kind of method for remediating phosphorus-contaminated soil, and concrete way is:

[0013] The sampling area is located at the Jinhe Phosphate Mine (104°50′E, 30°25′N) in Hongbai Town, Shifang City (one of the four major phosphate mines in China). Sampling was carried out at the seedling stage, flowering stage, and mature stage, and the plants were analyzed. of phosphorus content. The results show that Polygonum hydropiper has a large phosphorus content in the mine soil, and the phosphorus content in the body reaches 8.59g kg at the flowering stage -1 . Referring to the screening indicators of heavy metal-enriched plants, we can use four indicators of aboveground phosphorus content, phosphorus accumulation, transfer coefficient and enrichment coefficient to screen phosphorus-enriched plants. The use of phytoremediation to successfully remove excess phosphorus in the soil should satisfy the aboveground phosphorus content of the plant, which is h...

Embodiment 2

[0015] In this example, Polygonum hydroponica was used as the experimental material to further verify its advantages in remediating soil phosphorus pollution and its corresponding physiological mechanism through indoor pot experiments.

[0016] The soil for the test was taken from the fluvo-aquic soil (1-10cm) of Daxing Town, Yucheng District, Ya'an City, and the soil was passed through a 2mm sieve after removing stones. Soil pH is 7.29, total phosphorus 1.01g kg -1 , available phosphorus 13.96mg kg -1 , available potassium 63.53mg kg -1 , available nitrogen 68.93mg kg -1 . The content of available nitrogen and available potassium in the soil is close to mine soil. The test accurately weighed 6kg of soil and put it into a 5L plastic bucket. Four phosphorus levels were set up in the test, which were 0, 50, 100 and 200 mg P kg -1 , namely 0, 0.57, 1.15 and 2.30g pot -1 , phosphate fertilizer is KH 2 PO 4 , with no phosphorus application as the control, four repetitions,...

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Abstract

The invention relates to a bioremediation method for phosphorus contamination, in particular to a method for remediation of phosphorus-contaminated soil, which comprises the following steps of: growing polygonum hydropiper in the phosphorus-contaminated soil; directly transplanting the polygonum hydropiper or directly sowing seeds of the polygonum hydropiper for growth; and regularly harvesting the overground part of the planted polygonum hydropiper. By utilizing the phosphorus enriching characteristic of the polygonum hydropiper, the polygonum hydropiper is grown in the soil, absorbs the phosphorus accumulated in the soil, and transfers most of phosphorus to the overground part so as to fulfill the aim of remediation of the phosphorus-contaminated soil. The polygonum hydropiper has vigorous vitality, is easy to survive, and does not need special management in the growing process, so the cost is low, and the operability is high. Meanwhile, the polygonum hydropiper has traditional Chinese medicinal effect of treating acute filthy disease stomachache, vomiting and diarrhea and spasm of calf, diarrhea, dysentery, rheumatism, dermatophytosis, carbuncle, mange, traumatic injury and the like, so the resource can be fully and reasonably utilized and is multipurpose.

Description

technical field [0001] The invention relates to a bioremediation method for phosphorus pollution, in particular to a method for remediating phosphorus-contaminated soil. Background technique [0002] Phosphorus is an important nutrient element for plant growth. Insufficient supply of phosphorus often restricts the normal growth of plants in natural ecosystems, because the available phosphorus in the soil is mainly in the form of phosphate, and the phosphate is easily combined with metals in the soil. Ions combine to form precipitation, resulting in very little available phosphorus in the soil, which cannot meet the needs of plants, which requires a large amount of phosphorus fertilizer to be invested in the agricultural production process. Because the chemical phosphorus fertilizer applied to the soil is also easily absorbed, fixed and mineralized by the soil, the utilization rate of phosphorus fertilizer is usually only 10%-20%, and the rest is temporarily or long-term reta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 余海英李廷轩张锡洲郑子成王永东黄霞
Owner SICHUAN AGRI UNIV
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