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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参考文献(24)

[1]	E20环境平台水业研究中心.中国污水处理市场机会识别地图[R].北京:E20研究院,2018.
[2]	房振全,满佳琪,刘菲菲,等.污泥焚烧细颗粒物中重金属赋存形态的研究[J].中国环境科学,2020. 40(7):3044-3053.
[3]	北京中研华泰信息技术研究院.中国污泥处理处置行业现状调研及前景趋势预测报告2019-2025年[R].北京:产业经济研究院,2019.
[4]	刘东方,张友萍,王爱娟,等.华北地区典型城市污水处理厂污泥填埋处置可行性分析[J].环境污染与防治,2010, 32(5):40-42.
[5]	孟国欣.城市污泥堆肥腐熟度、应用效果及其生态风险评价[D].北京:北京林业大学,2019.
[6]	AVELAR N V, RIBEIRO B C, REZENDE A A P, et al. Thermal drying of industrial sludge using forced aeration[J]. Environmental Technology, 2019, 40(25):3297-3307.
[7]	ZHANG S, WANG F, MEI Z Y, et al. Status and development of sludge incineration in China[J]. Waste and Biomass Valorization, 2021, 12:3541-3574.
[8]	XIE S Y, YU G W, LI C X, et al. Treatment of high-ash industrial sludge for producing improved char with low heavy metal toxicity[J]. Journal of Analytical and Applied Pyrolysis, 2020, 150:104866.
[9]	LIU L H, HUANG L, HUANG R, et al. Immobilization of heavy metals in biochar derived from co-pyrolysis of sewage and calcium sulfate[J]. Journal of Hazardous Materials, 2021, 403:123648.
[10]	CHEN T, ZHANG Y, WANG H, et al. Influence of pyrolysis temperature on characteristics and heavy metal adsorptive performance of biochar derived from municipal sewage sludge[J]. Bioresource Technology, 2014, 164:47-54.
[11]	WANG Z K, LU J Y, WANG J J. Optimizing co-pyrolysis process conditions of sludge-peanut shells by response surface methodology[J]. Chinese Journal of Environmental Engineering, 2017, 11(10):5663-5670.
[12]	DONG Q, ZHANG S P, WU B, et al. Co-pyrolysis of sewage sludge and rice straw:thermal behavior and char characteristic evaluations[J]. Energy and Fuels, 2020, 34(1):607-615.
[13]	LIANG Q L, LIU Y C, CHEN M Y, et al. Optimized preparation of activated carbon from coconut shell and municipal sludge[J]. Materials Chemistry and Physics, 2020, 241:122327.
[14]	TIAN T, LIU Q S. Effects of added salts on sewage sludge char characteristics and heavy metal behaviors[J]. Journal of Analytical and Applied Pyrolysis, 2020, 146:104774.
[15]	KWON E E, LEE T, OK Y S, et al. Effects of calcium carbonate on pyrolysis of sewage sludge[J]. Energy, 2018, 153:726-731.
[16]	LI F Y, CAO X D, ZHAO L, et al. Effects of mineral additives on biochar formation:carbon retention, stability, and properties[J]. Environmental Science&Technology, 2014, 48:11211-11217.
[17]	李莉娜,董广霞,唐桂刚,等.中国含六价铬工业废水排放的行业贡献与空间分布特征分析[J].环境污染与防治,2013, 35(12):97-99.
[18]	祁丽,梅竹松,邱春生,等.生物淋滤对城市污泥重金属去除及形态变化的影响研究[J].环境污染与防治,2018, 40(10):1116-1121.
[19]	WU W, ZHOU Z, CHEN L Y, et al. Conditioning for excess sludge and ozonized sludge by ferric salt and polyacrylamide:orthogonal optimization, rheological characteristics and floc properties[J]. Chemical Engineering Journal, 2019, 373:1081-1090.
[20]	谭锦涛,吴新,李军辉,等.稻壳灰中温热处理稳固化垃圾飞灰重金属[J].中国环境科学,2020, 40(7):3054-3060.
[21]	刘高洁,周丹丹,李丽娜,等.柠檬酸对生物炭钝化污染土壤中重金属稳定性的影响[J].环境化学,2020, 39(2):343-351.
[22]	翁诗甫,徐怡庄.傅里叶变换红外光谱分析[M].北京:化学工业出版社,2019.
[23]	吴锋,杨康,范海宏,等.污泥中有机官能团的释放特性[J].材料科学与工程学报,2016,34(5):798-804.
[24]	肖香,方平,黄建航,等. CO₂含量对污泥燃烧Fuel-N析出特性的影响[J].环境科学学报,2019, 39(3):790-796.[26] 魏盟盟.污泥低温热解下有机硫向含硫气体转化特性的实验研究[D].武汉:华中科技大学,2014.[27] 钱婷婷.磷在固体废物热处理过程中的迁移转化及再利用[D].合肥:中国科学技术大学,2014.[28] 彭亚茹,吴维隆,郭智强,等.磷强化米饭残渣生物炭对土壤中Cd的稳定化[J].农业环境科学学报,2021, 40(2):338-346.[29] CAI Z H, CHU C J, ZHENG H, et al. Effect of pyrolytic temperature and time on characteristics of typha angustifolia derived biochar and preliminary assessment of the ecological risk[J]. Environmental Science, 2020, 41(6):2963-2971.[30] LI S S, YANG F, LI J S, et al. Porous biochar-nanoscale zero-valent iron composites:synthesis, characterization and application for lead ion removal[J]. Science of the Total Environment, 2020, 746:141037.[31] 李飞跃,张丽,李孝良,等.磷酸二氢钙与生物质共热解提高生物炭固碳效果[J].农业工程学报,2016, 32(12):201-205.[32] 郑施雯,邱纪侠,郑冲,等.土壤铬污染修复技术研究概述[J].河南科技,2017(9):157-158.[33] SONG Y, LI J, PENG M, et al. Identification of Cr (Ⅵ) speciation in ferrous sulfate-reduced chromite ore processing residue (rCOPR) and impacts of environmental factors erosion on Cr (Ⅵ) leaching[J]. Journal of Hazardous Materials, 2019, 373:389-396.[34] CHEN Z, YU G W, WANG Y, et al. Fate of heavy metals during co-disposal of municipal solid waste incineration fly ash and sewage sludge by hydrothermal coupling pyrolysis process[J]. Waste Management, 2020, 109:28-37.[35] 刁韩杰,张进,王敏艳,等.高温热解对污泥炭特性及其重金属形态变化的影响[J].环境工程,2019, 37(3):29-34.[36] 张大磊,李依韩,彭亢晋,等.铬渣秸秆共热解产物铬稳定性研究[J].环境污染与防治,2013,35(7):17-21.[37] 陈丽,陈爱侠,韩融,等.不同催化剂对污泥热解特性的影响及机理分析[J].环境工程,2019, 37(10):190-195.[38] 国家质量监督检验检疫总局,国家标准化管理委员会.地下水质量标准:GB/T 14848-2017[S].北京:中国标准出版社,2017. ELLIG D L, LAI C K, MEAD D W, et al. Pyrolysis of volatile aromatic hydrocarbons and n-heptane over calcium oxide and quartz[J]. Industrial&Engineering Chemistry Process Design&Development, 1985, 24(4):1080-1087.[25]