EFFECTIVENESS OF IN SITU TREATMENT OF BLACK-ODOR RIVER SEDIMENT BY CaO<sub>2</sub>

WANG Feng; DONG Wen-yi; WANG Hong-jie; LIU Tong-zhou; MAO Yan-qing; WU Hua-cai

doi:10.13205/j.hjgc.202012012

Volume 38 Issue 12

Apr. 2021

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(12): 64-69,123

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WANG Feng, DONG Wen-yi, WANG Hong-jie, LIU Tong-zhou, MAO Yan-qing, WU Hua-cai. EFFECTIVENESS OF IN SITU TREATMENT OF BLACK-ODOR RIVER SEDIMENT BY CaO₂[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(12): 64-69,123. doi: 10.13205/j.hjgc.202012012

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EFFECTIVENESS OF IN SITU TREATMENT OF BLACK-ODOR RIVER SEDIMENT BY CaO₂

doi: 10.13205/j.hjgc.202012012

1. School of Civil and Environmental Engineering, Harbin Institute of Technology(Shenzhen), Shenzhen 518055, China;
2. Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen 518055, China

Received Date: 2019-12-20
Available Online: 2021-04-23

Abstract

Abstract

CaO₂ has been widely used in the in-situ treatment of black-odor rivers sediment. However, most studies focused on the AVS (acidic volatile sulfide) removal effect from the sediment by CaO₂, and those focused on other pollution indicators were rare. Through a pilot experiment, the effect of in situ treatment of AVS and organics in black-odor river sediment by CaO₂ was investigated. Meanwhile, the color, ORP, pH, heavy metal content and morphology of the sediment were detected. The results showed that in situ treatment of black-odor river sediment pollutants by CaO₂ had ideal performance, with the removal rate of AVS reaching 98% above and the content of TOC decreasing by about 0.4%. At the same time, the color of the sediment changed from black to earthen yellow, the ORP increased from -150 mV to about 100 mV, and the pH changed from neutral to alkaline (about pH=11). The addition of CaO₂ had no effect on the change of heavy metal content in the sediment, but the heavy metals with relatively stable forms were converted into unstable forms.
- black-odor sediment,
- in-situ treatment,
- CaO₂,
- effectiveness study

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