EFFECT OF PYROLYSIS TIME ON CHARACTERISTICS AND HEAVY METAL ECOLOGICAL RISKS IN BIOCHAR MADE FROM WASTEWATER SLUDGE

XU Si-han; WANG Min-yan; ZHANG Jin; DIAO Han-jie; LI Yan-ming; SHAN Sheng-dao; CAO Yu-cheng

doi:10.13205/j.hjgc.202003027

Volume 38 Issue 3

Jun. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(3): 162-167

XU Si-han, WANG Min-yan, ZHANG Jin, DIAO Han-jie, LI Yan-ming, SHAN Sheng-dao, CAO Yu-cheng. EFFECT OF PYROLYSIS TIME ON CHARACTERISTICS AND HEAVY METAL ECOLOGICAL RISKS IN BIOCHAR MADE FROM WASTEWATER SLUDGE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(3): 162-167. doi: 10.13205/j.hjgc.202003027

Citation:

XU Si-han, WANG Min-yan, ZHANG Jin, DIAO Han-jie, LI Yan-ming, SHAN Sheng-dao, CAO Yu-cheng. EFFECT OF PYROLYSIS TIME ON CHARACTERISTICS AND HEAVY METAL ECOLOGICAL RISKS IN BIOCHAR MADE FROM WASTEWATER SLUDGE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(3): 162-167. doi: 10.13205/j.hjgc.202003027

Citation:

XU Si-han, WANG Min-yan, ZHANG Jin, DIAO Han-jie, LI Yan-ming, SHAN Sheng-dao, CAO Yu-cheng. EFFECT OF PYROLYSIS TIME ON CHARACTERISTICS AND HEAVY METAL ECOLOGICAL RISKS IN BIOCHAR MADE FROM WASTEWATER SLUDGE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(3): 162-167. doi: 10.13205/j.hjgc.202003027

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EFFECT OF PYROLYSIS TIME ON CHARACTERISTICS AND HEAVY METAL ECOLOGICAL RISKS IN BIOCHAR MADE FROM WASTEWATER SLUDGE

doi: 10.13205/j.hjgc.202003027

1. School of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, China;
2. Department of Bio-Environmental Sciences, Zhejiang A&F University, Shaoxing 311800, China;
3. School of Environment and Natural Resources, Zhejiang University of Science and Technology, Hangzhou 310023, China;
4. Zhejiang Province Key Laboratory of Recycling and Eco-treatment of Waste Biomass, Hangzhou 310023, China

Received Date: 2018-12-20

Abstract

Abstract

Pyrolysis is one of the promising technologies for wastewater sludge treatment, in which pyrolysis residence time is one of the primary factors affecting the properties of sludge biochar. This experiment studied the effects of different pyrolysis residence time (1 h, 2 h and 4 h) on physico-chemical properties, structure and total content of heavy metals in sludge biochar. In addition, the ecological risk of heavy metals in sludge biochar was also assessed. Results showed that with increase of the pyrolysis time (1~4 hours), the yield and H/C ratio of the sludge biochar were reduced to some extent, while the ash content and the specific surface area were increased accordingly, as well as the aromaticity. Compared with the raw sludge, the risk index of heavy metals, i.e. Cu, Zn, Pb, Cr, Mn, Ni in the sludge biochar was lowered significantly (p<0.05). When the pyrolysis residence time was set at 2 h, Cu, Pb, Cr, Mn, Ni, except Zn in the sludge biochar, were of lower risk, or at a risk-free status. The results could provide a theoretical basis for hazard-free treatment and resource reuse for the sludge.
- sludge pyrolysis,
- sludge charcoal,
- pyrolysis residence time,
- heavy metals,
- risk assessment

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