Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for repairing heavy metal polluted tailing sand by using ciliate desert-grass

A technology of tailings sand and heavy metals, which is applied in the field of phytoremediation, can solve the problems of lack of methods for repairing tailings, etc., and achieve the effects of increasing arsenic enrichment, increasing pH value, and strong arsenic absorption

Pending Publication Date: 2022-06-03
SUN YAT SEN UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a lack of tailings restoration methods that take into account vegetation coverage and extraction of toxic and harmful substances through plants, so as to essentially reduce the amount of heavy metals such as arsenic, lead, and zinc in tailings sand

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for repairing heavy metal polluted tailing sand by using ciliate desert-grass
  • Method for repairing heavy metal polluted tailing sand by using ciliate desert-grass
  • Method for repairing heavy metal polluted tailing sand by using ciliate desert-grass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 Modifier configuration and centipede cultivation

[0048] 1. Collection of heavy metal pollution tailings sand samples:

[0049] The tailings sand was collected from the surface layer (0-30cm) of the Dabaoshan tailings pond in Shaoguan City, Guangdong Province, mixed evenly and air-dried under natural conditions, and passed through a 2mm sieve. The pH of the tailings sand was 3.63 and the average arsenic content was 248.35mg / kg, which exceeded the "Soil Environment" Quality Agricultural Land Pollution Risk Control Standard (GB15618-2018) The highest risk screening value of arsenic pollution in agricultural land soil (40mg / kg). At the same time, the average cadmium content was 1.8 mg / kg, the average lead content was 197.51 mg / kg, and the average zinc content was 541.10 mg / kg.

[0050] 2. Improved ratio:

[0051] A modifier is added to the heavy metal polluted tailing sand and mixed evenly to obtain the improved heavy metal polluted tailing sand. In terms of ...

Embodiment 2

[0058] Select the centipede grass seedlings with good growth and similar height of about 4 cm cultivated in step 3, wash the roots and move them to a plastic pot filled with improved arsenic high-pollution tailings sand, place them in an artificial climate room and carry out the experiments. Cultivation, artificial climate chamber setting conditions are the same as step 3, 1 seedling is planted in each pot, water is applied once every 2 days, and potted for 60 days. Example 2 The growth status of centipede grass and the enrichment of arsenic

[0059] 1. Experimental method

[0060] 1. Sample collection:

[0061] The centipede grass after potted planting 60d in Example 1 step 4 was sampled, and the plant height of the centipede grass in the 8 improved groups was measured (under the natural growth state of the centipede grass, the vertical distance between the highest part of the plant and the rhizome), Photographs were taken to record the centipede grass in each treatment gro...

Embodiment 3

[0072] Example 3 Passivation of lead and zinc by improved repair method

[0073] 1. Experimental method

[0074] The soil samples after planting centipede grass in Example 1 were collected, and the effectiveness of lead and zinc in the improved tailings sand before and after planting centipede grass was determined by DTPA extraction method.

[0075] 2. Experimental results

[0076] The measurement results are shown in Table 4.

[0077] Table 4 Effects of adding amendments and centipede grass restoration methods on the availability of lead and zinc in tailings (average value)

[0078]

[0079] It can be seen from Table 4 that after improving the arsenic high-pollution tailings sand and planting centipede grass for 60 days under the conditions of improvement group 3 and improvement group 4, the content of available lead in the soil was significantly reduced, and the content of available zinc was also reduced. Considering the absorption and accumulation of arsenic by centip...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for repairing heavy metal polluted tailing sand by using ciliate desert-grass. A tailing sand modifier is mixed with heavy metal polluted tailing sand to obtain modified heavy metal polluted tailing sand, the mass ratio of lime to organic fertilizer to peat to calcium magnesium phosphate fertilizer in the tailing sand modifier is (7-13): (24-26): (49-51): (0.9-51), the organic fertilizer is composed of animal waste and plant ash, and the mass ratio of P to Mg to Ca in the calcium magnesium phosphate fertilizer is (5-5.5): (4.5-5): (17.5-18). The improved heavy metal polluted tailing sand is suitable for the growth of the ciliate desert-grass and accumulates and absorbs arsenic and passivates elements such as zinc and lead through the ciliate desert-grass. And meanwhile, heavy metals such as zinc and lead are effectively passivated, the effectiveness of the heavy metals such as zinc and lead is reduced, and the method has important significance on effective vegetation greening of the high-pollution tailings, shortening of the phytoremediation period and prevention and control of heavy metal risks.

Description

technical field [0001] The invention relates to the technical field of phytoremediation, in particular, to a method for restoring heavy metal-contaminated tailing sand by using centipede grass. Background technique [0002] Metal mining and smelting activities often result in compound pollution of heavy metals such as arsenic, lead and zinc, and have the characteristics of wide-ranging pollution, long duration and difficult to be biodegraded. Minerals containing heavy metals such as arsenic, lead and zinc are produced in huge quantities every year. A large amount of heavy metals such as arsenic, lead and zinc exist in tailings or are discharged to the environment in the form of three wastes. The diffusion of heavy metals such as arsenic, lead and zinc causes environmental pollution and health problems. threaten. Tailings are an important source of heavy metal pollution such as arsenic, lead and zinc in the surrounding farmland soil. Remediation of tailings is the most impor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08A01B77/00
CPCB09C1/105B09C1/08A01B77/00B09C2101/00
Inventor 曹越张文孙丹汤叶涛仇荣亮
Owner SUN YAT SEN UNIV