Life cycle assessment of sewage sludge treatment in China

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Wang, Xin^1 ; Yu, Fuyang^2 ; Fan, Qingxin^1

School of Harbin Institute of Technology, Harbin, China^1

Ecological Environment Technology Support Center of Heilongjiang Province, Harbin, China^2

关键词: Different treatments;    Impact on the environment;    Life Cycle Assessment (LCA);    Research object;    Resource utilizations;    Sewage sludge treatment;    Sludge treatment;    Treatment process;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/3/032057/pdf
DOI  :  10.1088/1755-1315/300/3/032057

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Taking sewage sludge (SS) as the research object, establish 6 scenarios of sludge treatment, S1: concentration and dehydration-cement preparation (CdCpd); S2: concentration and dehydration-lime stable-cement preparation (CdLsCpd); S3:concentration and dehydration-drying-landfill (CdDrL); S4: concentration and dehydration-drying-incineration-landfill (CdDrIL); S5: concentration and dehydration-drying-incineration-concrete preparation (CdDrICp); S6: concentrate-anaerobic digestion-land use (CALu), LCA is used to compare the environmental impacts of S1-S6 in China, find the unit that has a greater impact on environment in different treatments and substances and energy that have a greater impact on the environment in different units. The results show that the environmental impacts dealing with 1t SS (water content 80%) can be sequenced as S3 > S4 > S5>S6 > S1 > S2; the direct pollutants generated in the unite of direct landfill and incineration and the thermal energy required for drying have a great impact on the environment; after a series of treatments of SS for concrete preparation and cement preparation, that is, resource utilization can fix certain elements in the sludge, so that the environmental impact can be alleviated; the transfer of contaminants during the SS treatment process is a matter of concern, so that the focus of the SS treatment should be on the fixation of pollutants in the future.