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Plant restoration method for uranium polluted water

A technology for phytoremediation and uranium pollution, which is applied in the field of radioactive pollution control to achieve good feed value, well-developed root system, and environmental safety.

Inactive Publication Date: 2011-06-01
NANHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microbial remediation is still in the stage of research and development in the laboratory

Method used

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  • Plant restoration method for uranium polluted water
  • Plant restoration method for uranium polluted water
  • Plant restoration method for uranium polluted water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Uranium-contaminated water body A to be repaired: obtained by diluting 1g / L uranium standard solution with distilled water, simulating uranium-contaminated water body, adjusting pH=6.0 and ensuring that uranium in the water body does not precipitate, referred to as water body A.

[0037]In the laboratory, the day and night temperature is between 30°C-20°C, and the relative humidity is 60-80%. Add 2L of water body A with different treatment concentrations into a 2L beaker, and then add a plant one by one with a fresh weight of about 400g. Big hemp. Five treatments were set in the experiment: the concentration of uranium = 45 (CK), 500, 1500, 4500, and 9000 μg / L respectively, and the pH was adjusted to about 6.5 with carbonate buffer solution to ensure that no uranium in the water body A was precipitated. Each treatment has 3 repetitions. By continuously sampling and monitoring the concentration of residual uranium in the water body, the short-term 24h and long-term 5d r...

Embodiment 2

[0039] The uranium-contaminated water body B to be repaired: the initial concentration of uranium = 520 μg / L, pH = 7.80, which was taken from the overflow of an abandoned pit of a uranium mine in March 2009, referred to as water body B.

[0040] Add 100g, 200g, and 400g of scallions with a biomass of about 100g per plant to a group of water body B whose volume is 5L, which is an ordinary plastic pot and D=30cm. Regularly aerate for 5 minutes every day, sample and analyze every day, and monitor continuously for 5 days. The results showed that after 5 days, the average uranium content in leaves and roots of S. chinensis were 37.86±6.52μg / g and 1015.63±15.62μg / g, respectively. After adding 100g, 200g, and 400g of fenugreek, the average concentration of uranium in 5L of water body B was 130±25μg / L, 43±6μg / L, and 21±4μg / L, reaching the nuclear industry standard, national wastewater discharge standard, drinking water standards.

Embodiment 3

[0042] The uranium-contaminated water body C to be repaired: the initial concentration of uranium = 2100 μg / L, pH = 7.63, which was taken from a uranium mine pit water in April 2009, referred to as water body C.

[0043] To the water body C of a group of 5L beakers with 5L containers and the water body C of a group of 10L containers with rectangular parallelepiped water tanks, add a number of small plants with a biomass of 50% of each small plant and large scallion with a coverage area of ​​50%; aerate regularly for 5 minutes every day , sampling analysis after 20 days, the results showed that: the uranium content in leaves and root system of the scallop in 5L water body were 144.37, 4693.15μg / g respectively; 3649.52μg / g; the residual uranium concentrations in 5L and 10L water bodies were 771 and 360μg / L, respectively.

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Abstract

The invention provides a plant restoration method for uranium polluted water, and the method is characterized in that a floating aquatic plant Pistia stratiotes L is stocked in uranium polluted water, the plant root can quickly absorb and concentrate uranium in large amounts, simultaneously some uranium is transferred upward to leaves above water, through timing salvage, collection, and concentrated treatment, large amounts of uranium is removed from water, and after a certain restoration period, the uranium content in water can decline to the scope which is allowed in drinking water standard. The initial concentration of uranium is 1500 micrograms per liter; the proportion of added Pistia stratiotes L is about 1 / 5 of the water weight; after one day, the removing rate exceeds 98%, and the uranium concentration effectively declines to be lower than the drinking water standard (30 micrograms per liter). The method restores uranium polluted water quickly, purifies water thoroughly, and is suitable for various uranium polluted water. The method has no special requirement for equipment and a place to be restored, and is simple and easy for use.

Description

technical field [0001] The invention relates to the technical field of radioactive pollution treatment, in particular to a method for repairing uranium pollution in water bodies by using the aquatic plant Pistia stratiotes L. . Background technique [0002] Uranium mining, smelting, and nuclear energy research and utilization are important ways for uranium to be enriched and polluted in the environment. Through drinking water (accounting for about 64% of total intake) and food chain, some uranium in water will eventually enter the human body and cause potential threats. Studies have shown that after entering the human body, uranium mainly accumulates in the liver, kidneys and bones, causing damage to the human body in two forms of chemical toxicity and internal exposure. Depending on the dose, it can cause acute or chronic poisoning, induce various diseases or cause mutation, distortion and even canceration. In order to reduce the toxicity of uranium pollution to public he...

Claims

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Application Information

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IPC IPC(8): C02F3/32C22B3/06C22B60/02C02F101/20
CPCY02P10/20
Inventor 丁德馨高斌李广悦赵金芳聂小琴龙清刘玉龙郭梅王有团张宝俊易法清黄齐金
Owner NANHUA UNIV
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