Open AccessLife cycle assessment of sewage sludge treatment in China
Author(s) -
Xin Wang,
Fu-Yang Yu,
Qingxin Fan
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/300/3/032057
Subject(s) - incineration , dehydration , sewage sludge , environmental science , cement , lime , anaerobic digestion , waste management , resource recovery , pollutant , sewage , environmental chemistry , pulp and paper industry , chemistry , environmental engineering , materials science , wastewater , engineering , metallurgy , methane , biochemistry , organic chemistry
Taking sewage sludge (SS) as the research object, establish 6 scenarios of sludge treatment, S1: concentration and dehydration-cement preparation (C d C pd ); S2: concentration and dehydration-lime stable-cement preparation (C d L s C pd ); S3:concentration and dehydration-drying-landfill (C d D r L); S4: concentration and dehydration-drying-incineration-landfill (C d D r IL); S5: concentration and dehydration-drying-incineration-concrete preparation (C d D r IC p ); S6: concentrate-anaerobic digestion-land use (CAL u ), 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.