Method for promoting aquatic plants to remove heavy metals in sediments employing ultrasound

A technology for aquatic plants and heavy metals, which is applied in the field of heavy metals and achieves the effects of high removal efficiency, simple equipment and short reaction time.

Inactive Publication Date: 2015-04-29
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the use of ultrasound to promote aquatic plants to remove water sediments has not been reported, which is of great significance to the remediation technology of heavy metal pollution in water in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Example 1: Cultivate 20g of Foxtail Algae, Hytriphyllum verticillium, and Chrysophylla respectively in the tanks containing polluted water and sediments, perform ultrasonic treatment for 0min, 2min, 3min, and 5min every day, and harvest and treat the algae after one week of cultivation . It has been determined that foxtail algae, hydrilla verticillium, and hornwort can grow normally after ultrasonic treatment, and the growth rate is the best at 2 minutes, with growth rates of 44.65%, 31.75%, and 34.55%, respectively. During ultrasonic treatment at different times, the accumulation of heavy metals Cu, Zn, Pb, Cd, As, and Hg by algae under 2min treatment was 10-20 times that under 0min treatment, and then only slightly increased gradually during 3min and 5min treatment. After ultrasonic treatment for 5 minutes, hornwort and Hydrilla verticillium had the highest accumulation of copper, reaching 70.87 and 64.11 mg / kg; the accumulation of Zn, Pb, Cd, and As in hornwort under...

example 2

[0015] Example 2: Mix 10g of each of Foxtail Algae, Hydrilla verticillium, Chrysophylla, and Spirogyra in pairs, culture them in tanks with polluted water and sediments, and perform ultrasonic treatment for 0min, 2min, 3min, and 5min every day , and harvest the algae after one week of cultivation. It has been determined that four kinds of algae can grow normally after ultrasonic treatment, and the growth is best when they are treated for 2 minutes. The accumulation of heavy metals in algae treated with sonication was at least 10 times higher than that without sonication. The accumulation effect on each heavy metal is as follows:

[0016] For the accumulation of Cu, when ultrasonically treated for 2 min and 3 min, the mixed culture of hornwort + Hydra verticillium accumulated more copper than other mixed algae. When ultrasonically treated for 5 min, the mixed culture of hornwort + Spirogyra accumulated copper. And more than others, reaching 106.23mg / kg.

[0017] For the accu...

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PUM

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Abstract

The invention discloses a method for promoting aquatic plants to remove heavy metals in sediments employing ultrasound. Through treatment disclosed by the invention, absorption accumulation of the aquatic plants (algae such as myriophyllum spicatum, hydrilla, hornwort and spirogyra) on heavy metals can be effectively promoted; and heavy metal concentration in water bodies and sediments is reduced. The treatment method is high in removal rate on heavy metals in the water bodies and sediments; the required ultrasound time is short; equipment is simple; the plants after being subjected to ultrasonic treatment can normally grow; secondary pollution to the environment is not caused; and the method disclosed by the invention belongs to an environment-friendly heavy metal repair processing technology.

Description

technical field [0001] The invention relates to a method for promoting aquatic plants to remove heavy metals in sediments by using ultrasound. Background technique [0002] Heavy metal pollution is one of the three main sources of water pollution in the world. Due to their stable chemical properties, heavy metals are difficult to be absorbed and degraded by organisms. They will accumulate in organisms through the food chain and affect the normal metabolic activities of organisms. Heavy metals in water bodies are usually adsorbed by sediments such as silt and particulate matter, and deposited in the bottom mud of rivers, rivers, lakes, etc., and the concentration of heavy metals in sediments is generally hundreds of times to hundreds of thousands of those in aqueous solutions. times. When the temperature, pH, DO and other conditions in the water body environment change, some heavy metals adsorbed in the sediment will be released into the water body again, becoming the "seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
CPCC02F3/322C02F2101/20
Inventor 曾清如杨洋李巧云
Owner HUNAN AGRICULTURAL UNIV
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