IMMOBILIZATION EFFECT OF SLUDGE BIOCHAR ON HEAVY METALS IN CONTAMINATED DREDGED SEDIMENT IN RIVER CHANNELS IN MINING REGION

LIU Wei; XU Zhiqiang; LI Hongxing; CAO Chenjie; DONG Wen; FENG Minquan; QI Mingyang; LI Jiangbo; KOU Xiaomei; SHAO Tian

doi:10.13205/j.hjgc.202402004

Volume 42 Issue 2

Feb. 2024

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LIU Wei, XU Zhiqiang, LI Hongxing, CAO Chenjie, DONG Wen, FENG Minquan, QI Mingyang, LI Jiangbo, KOU Xiaomei, SHAO Tian. IMMOBILIZATION EFFECT OF SLUDGE BIOCHAR ON HEAVY METALS IN CONTAMINATED DREDGED SEDIMENT IN RIVER CHANNELS IN MINING REGION[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(2): 32-39. doi: 10.13205/j.hjgc.202402004

Citation:

LIU Wei, XU Zhiqiang, LI Hongxing, CAO Chenjie, DONG Wen, FENG Minquan, QI Mingyang, LI Jiangbo, KOU Xiaomei, SHAO Tian. IMMOBILIZATION EFFECT OF SLUDGE BIOCHAR ON HEAVY METALS IN CONTAMINATED DREDGED SEDIMENT IN RIVER CHANNELS IN MINING REGION[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(2): 32-39. doi: 10.13205/j.hjgc.202402004

Citation:

LIU Wei, XU Zhiqiang, LI Hongxing, CAO Chenjie, DONG Wen, FENG Minquan, QI Mingyang, LI Jiangbo, KOU Xiaomei, SHAO Tian. IMMOBILIZATION EFFECT OF SLUDGE BIOCHAR ON HEAVY METALS IN CONTAMINATED DREDGED SEDIMENT IN RIVER CHANNELS IN MINING REGION[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(2): 32-39. doi: 10.13205/j.hjgc.202402004

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IMMOBILIZATION EFFECT OF SLUDGE BIOCHAR ON HEAVY METALS IN CONTAMINATED DREDGED SEDIMENT IN RIVER CHANNELS IN MINING REGION

doi: 10.13205/j.hjgc.202402004

1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi' an 710048, China;
2. Northwest Engineering Corporation Limited, Xi'an 710065, China;
3. College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China

Received Date: 2023-07-30
Available Online: 2024-04-28

Abstract

Abstract

To clarify the immobilization effect of sludge biochar on Cu, Pb, and Cd in dredged sediment contaminated by river channel in a mining region, this study used the municipal sludge as raw material to prepare sludge biochar under anoxic condition at 500 ℃, analyzed the influences of addition ratios of different sludge biochar on the distribution and immobilization effect of three heavy metals in dredged sediment, combining with characterization methods of scanning electron microscopy, FTIR and XPS. The results showed that the addition of sludge biochar could improve the stabilization forms of heavy metals in dredged sediment. When the addition ratio was 1.0%, the proportion of Cu, Pb, and Cd in the stable(oxidizable and residual) in dredged sediment increased by 37.7%, 42.9%, and 42.4%, respectively. Sludge biochar mainly immobilizes heavy metals through complexation reaction and precipitation. The leaching concentration of Cu, Pb, and Cd in the dredged sediment after sludge biochar immobilized decreased from 0.876 mg/L, 0.057 mg/L and 0.018 mg/L to 0.253 mg/L, 0.011 mg/L and 0.001 mg/L, respectively. Meanwhile, the leaching concentration was lower than the limit of the Class Ⅲ standard of Environmental Quality Standard for Surface Water(GB 3838—2002). The immobilized dredged sediment can be reused as resources with no risk of secondary dissolution of heavy metals.
- sludge derived biochar,
- rivers in mining region,
- dredged sediment,
- heavy metal,
- immobilization effects

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References(37)

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