污泥与磷酸二氢钙共热解对残渣特性及Cr稳定性的影响

郭江山; 顾卫华; 白建峰; 董滨; 庄绪宁; 赵静; 王景伟

doi:10.13205/j.hjgc.202203008

污泥与磷酸二氢钙共热解对残渣特性及Cr稳定性的影响

doi: 10.13205/j.hjgc.202203008

郭江山¹,
顾卫华^1,2,4,
白建峰^1,2, ,,
董滨³,
庄绪宁^1,2,
赵静^1,2,
王景伟^1,2

1. 上海第二工业大学资源与环境工程学院, 上海 201209;
2. 上海电子废弃物资源化协同创新中心, 上海 201209;
3. 同济大学环境科学与工程学院, 上海 200092;
4. 浙江工业大学环境学院, 杭州 310014

基金项目:

国家自然科学基金(51578397)

上海市Ⅱ类高原学科-资源循环科学与工程

详细信息

作者简介:
郭江山(1996-),男,在读研究生,主要研究方向为污泥资源化利用。844402859@qq.com

通讯作者:
白建峰(1978-),男,教授,主要研究方向为重金属和有机污染物的生物地球化学循环。jfbai@sspu.edu.cn

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出版历程
- 收稿日期: 2021-05-11
- 网络出版日期: 2022-07-07

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

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

摘要

摘要: 污泥中不稳定Cr的存在严重威胁环境安全和人体健康。利用正交试验方法优化Ca(H₂PO₄)₂与污泥的混合比、热解终温、升温速率和停留时间,分析其对残渣特性及Cr稳定性的影响。结果表明:热解使污泥中的CH₂基团、脂肪族硝基-NO₂和硫酸氢盐分解。在添加Ca(H₂PO₄)₂后,残渣中出现了磷酸PO基团、磷酸二氢盐PO₂基团和磷酸盐PO₄基团。Ca(H₂PO₄)₂在共热解过程中转化为Ca(PO₃)₂,同时Cr在残渣中会形成Cr₂(SO₄)₃晶型化合物。当Ca(H₂PO₄)₂与污泥的质量比为15%、热解终温为650℃、升温速率为15℃/min、停留时间为90 min时,Cr的残渣态(F4)比例最高。此外,添加15%或30%的Ca(H₂PO₄)₂共热解后,残渣中Cr浸出浓度满足GB/T 14848-2017《地下水质量标准》中Ⅳ类水质要求,表明添加Ca(H₂PO₄)₂共热解可促进污泥中Cr的稳定化。
- 污泥 /
- 共热解 /
- Cr /
- 形态变化 /
- 浸出毒性
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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