EFFECT OF CO-PYROLYSIS OF SEWAGE SLUDGE AND Ca(H2PO4)2 ON RESIDUE CHARACTERISTIC AND CHROMIUM STABILITY

GUO Jiangshan; GU Weihua; BAI Jianfeng; DONG Bin; ZHUANG Xuning; ZHAO Jing; WANG Jingwei

doi:10.13205/j.hjgc.202203008

Volume 40 Issue 3

Mar. 2022

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GUO Jiangshan, GU Weihua, BAI Jianfeng, DONG Bin, ZHUANG Xuning, ZHAO Jing, WANG Jingwei. EFFECT OF CO-PYROLYSIS OF SEWAGE SLUDGE AND Ca(H2PO4)2 ON RESIDUE CHARACTERISTIC AND CHROMIUM STABILITY[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(3): 45-50,88. doi: 10.13205/j.hjgc.202203008

Citation:

GUO Jiangshan, GU Weihua, BAI Jianfeng, DONG Bin, ZHUANG Xuning, ZHAO Jing, WANG Jingwei. EFFECT OF CO-PYROLYSIS OF SEWAGE SLUDGE AND Ca(H₂PO₄)₂ ON RESIDUE CHARACTERISTIC AND CHROMIUM STABILITY[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(3): 45-50,88. doi: 10.13205/j.hjgc.202203008

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EFFECT OF CO-PYROLYSIS OF SEWAGE SLUDGE AND Ca(H₂PO₄)₂ ON RESIDUE CHARACTERISTIC AND CHROMIUM STABILITY

doi: 10.13205/j.hjgc.202203008

1. School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China;
2. Shanghai Collaborative Innovation Centre for WEEE Recycling, Shanghai 201209, China;
3. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
4. College of Environment, Zhejiang University of Technology, Hangzhou 310014, China

Received Date: 2021-05-11
Available Online: 2022-07-07

Abstract

Abstract

Unstable Cr fractions existed in sludge seriously threatens environmental safety and human health. Conditions including the blend ratio of sludge and Ca(H₂PO₄)₂, final temperature, heating rate, and retention time, were optimized using an orthogonal experiment. And its effects on residue characteristic and Cr stability were further investigated. Results indicated that pyrolysis could lead to the decomposition of functional groups in sludge, such as CH₂, aliphatic nitro-NO₂, and bisulfate. In co-pyrolysis with Ca(H₂PO₄)₂, phosphorous functional group was generated in co-pyrolysis residue. Ca(H₂PO₄)₂ was decomposed and Ca(PO₃)₂ was formed. Meanwhile, Cr in sludge could be transformed into a crystalline compound of Cr₂ (SO₄)₃ during co-pyrolysis. When the condition was blend ratio of 15%, final temperature of 650℃, heating rate of 15℃/min, and retention time of 90 min, the proportion of F4 fraction was the highest. In addition, the leaching concentration of Cr met the IV standard stipulated by the groundwater quality standard (GB/T 14848-2017), indicating that Cr in sludge could be more stable in co-pyrolysis with Ca(H₂PO₄)₂.
- sewage sludge,
- co-pyrolysis,
- chromium,
- morphological change,
- toxic leaching

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References(24)

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