Thermal hydrolysis modification of coal chemical sludge and its blending for slurry preparation

LI Zhenxing; YAN Jiandang; SUN Yu'an; YU Wenhao; WANG Pengfei; WANG Jing

doi:10.13205/j.hjgc.202511019

Volume 43 Issue 11

Nov. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(11): 171-178

LI Zhenxing, YAN Jiandang, SUN Yu'an, YU Wenhao, WANG Pengfei, WANG Jing. Thermal hydrolysis modification of coal chemical sludge and its blending for slurry preparation[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 171-178. doi: 10.13205/j.hjgc.202511019

Citation:

LI Zhenxing, YAN Jiandang, SUN Yu'an, YU Wenhao, WANG Pengfei, WANG Jing. Thermal hydrolysis modification of coal chemical sludge and its blending for slurry preparation[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 171-178. doi: 10.13205/j.hjgc.202511019

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Thermal hydrolysis modification of coal chemical sludge and its blending for slurry preparation

doi: 10.13205/j.hjgc.202511019

1. Zhengzhou Light Industry Technology Research Institute Co., Ltd., Zhengzhou 450001, China;
2. Shanxi Shenwei Coal Pipeline Transportation Co., Ltd., Weinan 714000, China;
3. College of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China

Received Date: 2024-12-18
Accepted Date: 2025-02-10
Rev Recd Date: 2025-01-25

Available Online: 2026-01-09

Abstract

Abstract

The research focused on coal to olefin sludge， and explored the optimal process condition for coal chemical sludge blending and pulping by utilizing thermal hydrolysis technology，to achieve structural depolymerization and directional conversion of bound water. By comparing the changes in key parameters such as sludge viscosity， relaxation time， and capillary water absorption time before and after sludge modification， the optimal modification conditions were determined. In addition， a comprehensive and objective evaluation of the modification effect of sludge was conducted by combining the dynamic changes in chemical oxygen consumption and sludge mixing concentration. The results showed that when the modification temperature was 180 ℃ and the hydrolysis time was 240 minutes， the viscosity of the sludge decreased from 919 mPa · s to 57 mPa · s， and the capillary water absorption time decreased sharply from over 5000 s to 108 s. The flow state and dewatering performance of the sludge were significantly improved； after sludge modification， the chemical oxygen consumption increased from 1460 mg/L to 18203 mg/L， with an increase of 12.5 times； by blending modified sludge with coal for pulping， when the sludge addition was 10%， the maximum slurry concentration obtained was 63.8%， meeting the requirement of industry standard of no less than 63% for coal water slurry pulping； and the modification time was calibrated using a hot reaction kettle， confirming that the optimal modification time for industrial demonstration was 60 minutes. The research provides new ideas for the harmless， resourceful， and rational disposal of coal chemical sludge， and lays a foundation for constructing a "waste-free" green new process with nearly zero emission of typical difficult-to-treat solid waste in the coal chemical industry.
- coal chemical sludge,
- thermal hydrolysis,
- relaxation time,
- coal water slurry,
- resource utilization

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References(39)

References

[1]	SUN Z L. Practice and exploration of resource utilization of wastewater and sludge in coal chemical enterprises［J］. Coal Economic Research，2019，39（2）：59-62. 孙宗礼．煤化工企业污水污泥资源化利用的实践与探索［J］．煤炭经济研究，2019，39（2）：59-62.
[2]	XU T，HE G F，SUN Y A，et al. Study on the influence of hydrothermal modified coal to oil sludge on coal slurry properties［J］. Coal Technology，2019，41（6）：218-221. 徐彤，何国锋，孙雨安，等．水热改性煤制油污泥对煤成浆性的影响研究［J］．煤炭技术，2019，41（6）：218-221.
[3]	DING Y N，YANG S W. Resource utilization of biochemical sludge［J］. Chemical Design Communication，2024，50（10）：149-152. 丁亚楠，杨少武．生化污泥资源化利用［J］．化工设计通讯，2024，50（10）：149-152.
[4]	ZHANG Q Q. Development history of sludge treatment and disposal technology in China［J］. Shanxi Chemical Industry，2024，6（44）：45-48. 张其全．我国污泥处理处置技术发展历程［J］．山西化工，2024，6（44）：45-48.
[5]	WANG J Y. Research on energy treatment and utilization of municipal sludge［J］. Energy Conservation and Environmental Protection，2024，8（1）：62-69. 王嘉颖．市政污泥能源化处置及利用研究［J］．节能与环保，2024，8（1）：62-69.
[6]	HU Y F. Preparation and slurry formation mechanism of modified urban sludge coal slurry［D］. Xuzhou：China University of Mining and Technology，2015. 胡远丰．改性城市污泥-煤浆的制备及其成浆机理研究［D］．徐州：中国矿业大学，2015．
[7]	FENG P，ZHANG Y X，HUANG B，et al. Study on the basic characteristics of coal to oil sludge for preparing sludge coal slurry［J］. Coal Engineering，2018，50（5）：131-134. 封萍，张宇星，黄波，等．煤制油污泥制备污泥煤浆的基础特性研究［J］．煤炭工程，2018，50（5）：131-134.
[8]	CUI C H，ZHANG L，LIU M J，et al. Study on the emission characteristics of polycyclic aromatic hydrocarbons and dioxins during the treatment of multi-source organic waste in a coal water slurry gasifier system［J/OL］. 1-10［ 2025-11-25］. https：//doi.org/10.19674/j.cnki.issn1000-6923.20240412.021. 崔长颢，章磊，刘美佳，等．水煤浆气化炉系统处理多源有机废物过程中多环芳烃和二噁英的排放特征研究［J/OL］． 1-10［ 2025-11-25］. https：//doi.org/10.19674/j.cnki.issn1000-6923.20240412.021.
[9]	HE G F，LÜ X Y，ZHANG S J，et al. Effects of three types of wastewater from coal to methanol on the performance of coal slurry［J］. Coal Chemical Industry，2020，48（3）：18-21. 何国锋，吕向阳，张胜局，等．煤制甲醇三种废水对煤成浆性能的影响［J］．煤化工，2020，48（3）：18-21.
[10]	LIU R Z，YU X，YU P F，et al. New insights into the effect of thermal treatment on sludge dewaterability［J］． Science of the Total Environment，2019，656：1082-1090.
[11]	MA S L. Study on the occurrence characteristics of water and harmful impurities in urban sludge and their co slurry behavior with coal［D］. Xuzhou：China University of Mining and Technology，2016. 马少莲．城市污泥中水和有害杂质的赋存特性及其与煤共成浆行为研究［D］．徐州：中国矿业大学，2016.
[12]	HAO J Y，CHEN S X，CHEN X，et al. Application and prospects of pyrolysis carbonization technology in sludge disposal［J］. Environmental Engineering，2024，42（9）：261-275. 郝婧宇，陈淑娴，陈祥，等．热解炭化技术在污泥处置中的应用与展望［J］. 环境工程，2024，42（9）：261-275.
[13]	ZHANG S P，LIU J J，YANG X Q，et al. Composition，structural characteristics，and thermal conversion performance of coal chemical water treatment sludge［J］. Coal Chemical Industry，2024，52（5）：98-104. 张书培，刘竞杰，杨晓勤，等．煤化工水处理污泥的组成、结构特征及热转化性能［J］．煤化工，2024，52（5）：98-104.
[14]	GUO Z X. Current status and development prospects of biomass fuel preparation technology by sludge blending［J］. Clean Coal Technology，2015，21（5）：71-75. 郭志新．污泥掺混制备生物质燃料技术现状与发展前景［J］．洁净煤技术，2015，21（5）：71-75.
[15]	MA S L，WU G G，ZHOU R，et al. Study on the slurry formation mechanism of coal water slurry prepared from NaOH modified sludge［J］. Science，Technology and Engineering，2024，16（32）：274-277. 马少莲，吴国光，周蕊，等． NaOH改性污泥制备污泥水煤浆的成浆机理研究［J］．科学技术与工程，2024，16（32）：274-277.
[16]	WANG R K，ZHAO Z H，YIN Q Q. Effect of low-temperature thermal alkali hydrolysis modification on the characteristics of sludge coal co slurry［J］. Coal Science and Technology，2017，45（2）：191-196. 王睿坤，赵争辉，尹倩倩．低温热-碱解改性对污泥与煤共成浆特性的影响［J］．煤炭科学技术，2017，45（2）：191-196.
[17]	XIE J C，TONG K，WANG C，et al. Research progress on hydrothermal treatment technology for high water content oily sludge［J］. Chemical Environmental Protection，2023，43（5）：565-571. 谢加才，仝坤，王淳，等．高含水含油污泥水热处理技术研究进展［J］．化工环保，2023，43（5）：565-571.
[18]	FARNO E，BAUDEZ J C，Parthasarathy R，et al. The viscoelastic characterisation of thermally-treated waste activated sludge［J］． Chem Eng J，2016，304：362-368.
[19]	FENG G H，MA H，BAI T T，et al. Rheological characteristics of activated sludge and thermal treated sludge at different process temperature［J］． Water Sci Technol，2018，2017（1）：229-237.
[20]	LIU T J，WU C S. Review of research on sludge dewatering pretreatment technology［J］. Strait Science，2020（3）：43-46. 刘婷娇，吴春山．污泥脱水预处理技术研究述评［J］．海峡科学，2020，（3）：43-46.
[21]	CAO X Q，LIU T，JIANG K，et al. Effects of low-temperature hydrothermal hydrolysis on the thixotropy and dewatering properties of sludge［J］. Journal of Environmental Engineering，2019，13（4）：977-981. 曹秀芹，柳婷，江坤，等．低温热水解对污泥触变性能及脱水性能的影响［J］．环境工程学报，2019，13（4）：977-981.
[22]	FENG G H，BAI T T，HU Z，et al. Research progress on sludge thermal hydrolysis technology［J］. Chemical Environmental Protection，2020，40（3）：232-238. 冯国红，白天添，胡智，等．污泥热水解技术研究进展［J］．化工环保，2020，40（3）：232-238.
[23]	DU Y Y，ZHANG L，WANG X，et al. Experimental study on improving sludge dewatering performance by hydrothermal pretreatment［J］. Industrial Safety and Environmental Protection，2017，43（5）：27-29. 杜元元，张雷，汪恂，等．热水解预处理改善污泥脱水性能的实验研究［J］．工业安全与环保，2017，43（5）：27-29.
[24]	YANG P. Research on a new anaerobic sludge digestion technology based on thermohydrolysis modification［D］. Beijing：Beijing University of Chemical Technology，2021. 杨鹏．基于热水解改性的新型污泥厌氧消化技术的研究［D］．北京：北京化工大学，2021.
[25]	LV X F，WANG M，GUO Y B，et al. The effect of high temperature hot water hydrolysis on sludge dehydration performance［J］. Environmental Engineering，2023，41（S1）：848-850. 吕潇枫，王梅，郭雁斌，等．高温热水解对污泥脱水性能的影响［J］．环境工程，2023，41（增刊1）：848-850.
[26]	XIA X，SHAO Q Q，CAO Y，et al. Energy recovery and carbon emissions analysis of anaerobic digestion of sludge under different treatment modes［J］. Environmental Engineering，2023，41（7）：1-7. 夏雪，邵钱祺，曹悦，等．不同处理模式下污泥厌氧消化的能源回收与碳排放分析［J］．环境工程，2023，41（7）：1-7.
[27]	ZHANG L W. Effects of adsorbents and solvents on the adsorption of organic pollutants-Comparison of BET method and NMR solvent relaxation technique［D］. Kunming：Kunming University of Science and Technology，2015. 张力伟．吸附剂和溶剂对有机污染物吸附的影响-BET法与NMR溶剂弛豫技术的比较［D］．昆明：昆明理工大学，2015.
[28]	GAN S L. Study on the hot water hydrolysis sludge flash evaporation process device and dehydration performance［D］. Chengdu：Sichuan University，2022. 甘圣林．热水解污泥闪蒸工艺装置与脱水性能的研究［D］．成都：四川大学，2022.
[29]	XIE H H. Measurement of bound water and experimental study on thermal hydrolysis of sludge［D］. Hangzhou：Zhejiang University，2011. 谢浩辉．污泥的结合水测量和热水解试验研究［D］．杭州：浙江大学，2011.
[30]	GAO S F. Research progress on thermal hydrolysis treatment of residual sludge［J］. Pollution Prevention and Control Technology，2016，29（6）：1-5. 高松峰．剩余污泥热水解处理研究进展［J］．污染防治技术，2016，29（6）：1-5.
[31]	YANG L L，ZHANG Y，HU D C，et al. Research progress on the use of physical methods-hydrothermal pretreatment technology for residual sludge［J］. Applied Chemical Engineering，2024，53（8）：1975-1978. 杨丽丽，张勇，胡定成，等．利用物理法-热水解预处理剩余污泥技术的研究进展［J］．应用化工，2024，53（8）：1975-1978.
[32]	CHEN X Y. Research progress on sludge thermal hydrolysis technology［J］. Environmental Protection and Treatment，2024，24（8）：22-28. 陈孝彦．污泥热水解技术研究进展［J］．环境保护与治理，2024，24（8）：22-28.
[33]	LUO Y，QIAO S，YAN M，et al. The effect of different pretreatment methods on the cracking rate of reproductive sludge［J］. Journal of Beijing Institute of Technology，2025，51（4）：413-421. 罗渊，乔升，闫敏，等．不同预处理方式对生育污泥破解率的影响［J］．北京工业大学学报，2025，51（4）：413-421.
[34]	ZHU M Y，WU G G，HU Y F，et al. Slurry performance of alkali modified urban sludge coal［J］. Advances in Chemical Industry，2017，36（7）：2691-2696. 朱梦园，吴国光，胡远丰，等．碱改性城市污泥-煤的成浆性能［J］．化工进展，2017，36（7）：2691-2696.
[35]	DONG M，LI H P，MA T，et al. Analysis of the slurry and combustibility of modified chemical sludge and coal［J］. Journal of Xinyang Normal University，2017，30（4）：614-617. 董梅，李和平，马涛，等．改性化工污泥与煤的成浆性及燃烧性分析［J］．信阳师范学院学报，2017，30（4）：614-617.
[36]	MA S L，ZHOU R. Effects of urban sludge mixed with coal water slurry system on particle size and rheological properties of slurry［J］. Guangzhou Chemical Industry，2016，44（19）：67-69. 马少莲，周蕊．城市污泥掺混水煤浆体系对粒度和浆体流变性能的影响［J］．广州化工，2016，44（19）：67-69.
[37]	ZHANG X Y，HE G F，LI L，et al. Factors affecting the performance of coal water slurry and technological progress［J］. Clean Coal Technology，2019，25（6）：96-103. 张孝雨，何国锋，李磊，等．水煤浆性能的影响因素及技术进展［J］．洁净煤技术，2019，25（6）：96-103.
[38]	LI L，SUN H Y，HE G F，et al. Study on the influence of ultrafine particles on the slurry characteristics of high concentration coal slurry［J］. Coal Quality Technology，2021，36（5）：57-62. 李磊，孙海勇，何国锋，等．超细颗粒对高浓煤浆成浆特性的影响研究［J］．煤质技术，2021，36（5）：57-62.
[39]	DUAN Q B，LÜ X Y，XU M L，et al. Research on three peak fractal grading coal water slurry concentration technology［J］. Clean Coal Technology，2018，24（6）：37-42. 段清兵，吕向阳，徐明磊，等．三峰分形级配水煤浆提浓技术研究［J］．洁净煤技术，2018，24（6）：37-42.