Effects of HAP/CaO<sub>2</sub> compound on stabilizing heavy metals in black-odor sediments and ecological risk assessment

CUI Zhuang; LI Chaoxiang; WANG Hongjie; WANG Fupeng; DONG Wenyi; WANG Feng

doi:10.13205/j.hjgc.202505015

Volume 43 Issue 5

May 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(5): 134-142

CUI Zhuang, LI Chaoxiang, WANG Hongjie, WANG Fupeng, DONG Wenyi, WANG Feng. Effects of HAP/CaO2 compound on stabilizing heavy metals in black-odor sediments and ecological risk assessment[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 134-142. doi: 10.13205/j.hjgc.202505015

Citation:

CUI Zhuang, LI Chaoxiang, WANG Hongjie, WANG Fupeng, DONG Wenyi, WANG Feng. Effects of HAP/CaO₂ compound on stabilizing heavy metals in black-odor sediments and ecological risk assessment[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 134-142. doi: 10.13205/j.hjgc.202505015

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Effects of HAP/CaO₂ compound on stabilizing heavy metals in black-odor sediments and ecological risk assessment

doi: 10.13205/j.hjgc.202505015

CUI Zhuang¹,
LI Chaoxiang²,
WANG Hongjie^2,3,4,
WANG Fupeng²,
DONG Wenyi^2,3,4,
WANG Feng^{2,5
,
,}

1. China Northeast Municipal Engineering Design and Research Institute Co., Ltd., Changchun 130021, China;
2. School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China;
3. Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen 518055, China;
4. State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology), Harbin 150090, China;
5. School of Economics and Management, Harbin Institute of Technology Shenzhen, Shenzhen 518055, China

Received Date: 2024-03-01
Accepted Date: 2024-05-05
Rev Recd Date: 2024-04-23

Available Online: 2025-09-11

Abstract

Abstract

Calcium peroxide （CaO₂） can effectively eliminate the black-odor of the sediment， but it can lead to the release of some heavy metals in the sediment by destabilization， resulting in potential ecological risks. To achieve the multiple effects of simultaneously eliminating the black-odor of the sediment and stabilizing heavy metals， this study develops a method for sediment remediation using hydroxyapatite and calcium peroxide （HAP/CaO₂）. The results showed that the dosing HAP/CaO₂ at a ratio of 3∶1 could be added to the sediment to effectively eliminate the blackness and odor of the sediment， improve the redox state and remove organic pollutants. The removal rate of acid volatile sulfide （AVS） reached about 95%， the oxidation-reduction potential （ORP） increased to 14.2 mV， and the total organic carbon （TOC） decreased by about 0.6%. Meanwhile， a variety of heavy metals were stabilized， the residual fraction of Ni， Cr， and Pb increased by about 16.9%， 26.7%， and 21.9%， respectively， and the leaching concentration decreased to below 1.0 mg/L， 1.5 mg/L， and 1.0 mg/L， respectively， complying with the stringent Technical Specification for Output Disposal of Contaminated Sediment Treatment Plant of River And Lake （SZDB/Z 236—2017）（Class I）. Moreover， there was no ecological risk in the remediated sediment， and the plant height， root length， and fresh weight of Vallisneria natans increased by 80%， 15.5%， and 18.7%， respectively， and the mortality rate of the Bellamya aeruginosa decreased by about 5%. The microbial community structure of the treated sediment did not change significantly， and Proteobacteria， Firmicutes， and Desulfobacta were always the dominant bacterium groups. This study offers an effective and safe method for treating black-odor sediment contaminated by heavy metals.
- black-odor sediment,
- heavy metals,
- HAP/CaO₂ compound,
- stabilization,
- ecological risks

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References(30)

References

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