PASSIVATION EFFECT OF CALCIUM PHOSPHATE ON URANIUM IN SEDIMENTS IN DOWNSTREAM WATERS OF A URANIUM MINE

PENG Yan; CHEN Di-yun; CHEN Nan; ZENG Lin-wei

doi:10.13205/j.hjgc.202104003

Volume 39 Issue 4

Jul. 2021

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PENG Yan, CHEN Di-yun, CHEN Nan, ZENG Lin-wei. PASSIVATION EFFECT OF CALCIUM PHOSPHATE ON URANIUM IN SEDIMENTS IN DOWNSTREAM WATERS OF A URANIUM MINE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(4): 13-19,24. doi: 10.13205/j.hjgc.202104003

Citation:

PENG Yan, CHEN Di-yun, CHEN Nan, ZENG Lin-wei. PASSIVATION EFFECT OF CALCIUM PHOSPHATE ON URANIUM IN SEDIMENTS IN DOWNSTREAM WATERS OF A URANIUM MINE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(4): 13-19,24. doi: 10.13205/j.hjgc.202104003

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PASSIVATION EFFECT OF CALCIUM PHOSPHATE ON URANIUM IN SEDIMENTS IN DOWNSTREAM WATERS OF A URANIUM MINE

doi: 10.13205/j.hjgc.202104003

1. School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China;
2. Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou 510006, China

Received Date: 2020-04-30
Available Online: 2021-07-21

Abstract

Abstract

Calcium phosphate was used to solidify the simulated uranium contaminated soil, and its passivation effect on the available uranium in the soil was analyzed. Based on this, the sediment in the downstream of a uranium mine in northern Guangdong was collected, and the occurrence forms of uranium before and after the passivation was carried out by sequential chemical extract method. The results showed that the uranium in the sediments mainly occured in Fe-Mn oxides combining species, and the content of available uranium in the sediments could be reduced by adding calcium phosphate. The exchangeable uranium content in stream sediments, pond sediment and paddy soil decreased by 58.27%, 58.04% and 52.62% respectively, and the carbonate bound uranium content decreased by 33.58%, 47.98% and 32.58% respectively. The content of organic combining species increased by 32.95%, 46.86% and 30.50% respectively in stream sediment, pond sediment and paddy soil, and the content of residual uranium increased by 252.67%, 61.90% and 98.96% respectively. The pond sediment and paddy soil with medium risk to the environment before passivation were reduced to low risk, and the proportion of available uranium in the stream sediment with low risk decreased by 1/3. In this study, the effect of calcium phosphate could effectively reduce the harm of uranium in sediment, which provided some reference for radionuclide pollution control and environmental remediation.
- calcium phosphate,
- sediment,
- uranium,
- species,
- passivation

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References(43)

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