EFFECT OF PREPARATION PROCESS ON SPECIATION DISTRIBUTION AND ECOLOGICAL RISK OF Zn, Cu AND Pb IN nZVI/SLUDGE BASED BIOCHARS

TANG Chuan-wu; LIU Li-heng; HUANG Rong; HE Dong-wei

doi:10.13205/j.hjgc.202010034

Volume 38 Issue 10

Nov. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(10): 216-221

TANG Chuan-wu, LIU Li-heng, HUANG Rong, HE Dong-wei. EFFECT OF PREPARATION PROCESS ON SPECIATION DISTRIBUTION AND ECOLOGICAL RISK OF Zn, Cu AND Pb IN nZVI/SLUDGE BASED BIOCHARS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 216-221. doi: 10.13205/j.hjgc.202010034

Citation:

TANG Chuan-wu, LIU Li-heng, HUANG Rong, HE Dong-wei. EFFECT OF PREPARATION PROCESS ON SPECIATION DISTRIBUTION AND ECOLOGICAL RISK OF Zn, Cu AND Pb IN nZVI/SLUDGE BASED BIOCHARS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 216-221. doi: 10.13205/j.hjgc.202010034

Citation:

TANG Chuan-wu, LIU Li-heng, HUANG Rong, HE Dong-wei. EFFECT OF PREPARATION PROCESS ON SPECIATION DISTRIBUTION AND ECOLOGICAL RISK OF Zn, Cu AND Pb IN nZVI/SLUDGE BASED BIOCHARS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 216-221. doi: 10.13205/j.hjgc.202010034

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EFFECT OF PREPARATION PROCESS ON SPECIATION DISTRIBUTION AND ECOLOGICAL RISK OF Zn, Cu AND Pb IN nZVI/SLUDGE BASED BIOCHARS

doi: 10.13205/j.hjgc.202010034

TANG Chuan-wu^1,2,3,
LIU Li-heng^{1,2,3
,
,},
HUANG Rong^1,2,3,
HE Dong-wei^1,2,3

1. College of Environmental Sciences and Engineering, Guilin University of Technology, Guilin 541004, China;
2. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China;
3. Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China

Received Date: 2019-02-27

Abstract

Abstract

The biochars were prepared by pyrolysis using municipal sludge as the raw material and nano-zero-valent iron (nZVI) as the additive. The effect of nZVI addition, pyrolysis temperature and heating rate on speciation distribution and ecological risk of Zn, Cu and Pb in biochars was investigated. The results showed that the higher nZVI addition, higher pyrolysis temperature and lower heating rate could increase the contents of Zn, Cu and Pb in the steady state (BCR method). The higher nZVI addition could promote the conversion of Zn, Cu and Pb to the oxidizable state, while the higher pyrolysis temperature and lower heating rate were favorable for the formation of residual Zn, Cu and Pb. The optimized nZVI addition, pyrolysis temperature and heating rate were 2000 mg/kg, 800 ℃ and 4 ℃/min, respectively. In addition, when the addition amount of nZVI was 800 mg/kg, the pyrolysis temperature was 800 ℃ and the heating rate was 2 ℃/min, which was conducive to reduce the ecological risk of Zn, Cu and Pb. The approximate ecological risk levels of Zn, Cu and Pb were low risk, low risk and no risk, respectively. Compared with Cu and Pb, the ecological risk of Zn was higher. If the RI value was used as the evaluation index, the optimized preparation process of nZVI/sludge-based biochar was as follow: nZVI dosage of 200 mg/kg, pyrolysis temperature of 800 ℃, heating rate of 5 ℃/min.
- nZVI/sludge based biochars,
- preparation technology,
- heavy metal,
- morphology distribution,
- ecological risk

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