GUOYan-feng,ZHANGChi,KONGXin,et al.Effect of Carbonization Intensity on Dewatering Performance and Physicochemical Properties of Municipal Sludge[J].China Water & Wastewater,2024,40(19):81-86.
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Effect of Carbonization Intensity on Dewatering Performance and Physicochemical Properties of Municipal Sludge

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第19期 Page: 81-86 Column: Date of publication: 2024-10-01
Author(s):
GUO　Yan-feng1; 2;  ZHANG　Chi1;  KONG　Xin1;  YUAN　Jin1;  YANG　Zhi-hong3;  WU　Bo3;  ZHANG　Ling-yun4
（1. College of Environmental Science and Engineering， Taiyuan University of Technology， Jinzhong 030600， China； 2. Beijing Branch， North China Municipal Engineering Design & Research Institute Co. Ltd.， Beijing 100044， China； 3. Shanxi Zhengyang Sewage Purification Limited Company， Jinzhong 030600， China； 4. Shanxi Xinkelian Environmental Technology Limited Company， Taiyuan 030024， China）
Keywords:
municipal sludge;  hydrothermal carbonization;  carbonization intensity;  dewatering performance;  functional group
Abstract:
The coalification model proposed by Ruyter was employed in the pretreatment of municipal sludge through hydrothermal carbonization, and the influences of carbonization intensity f on the physicochemical properties of the pyrolysis solution, hydrothermal carbon, and the dewatering performance of sludge were examined. After pretreatment with a carbonization intensity of 0.12, the water content of the sludge could be reduced to 53%, which was 28% lower than that of the control group without pretreatment. In addition, enhancing the carbonization intensity could facilitate the release of NH4+-N, SCOD, and TOC in the pyrolysis solution. When the carbonization intensity was 0.12, the SCOD and TOC could respectively reach 18 210 mg/L and 8 685 mg/L, while the NH4+-N increased with the increase of carbonization intensity under the condition of f equal or less than 0.21. Additionally, it was discovered that the contents of protein and polysaccharide in EPS exhibited a significant correlation with the dewatering performance of sludge. As the carbonization intensity rose, the aromatization structure on the surface of hydrothermal carbon increased significantly, while the hydrophilic oxygen-containing functional groups decreased, thereby enhancing the sludge dewatering performance. The process was implemented in a sewage treatment plant. The results indicated that the water content of carbonized sludge could be reduced to approximately 29% through plate and frame filter press, and the dewatering performance was remarkable.
Last Update: 2024-10-01