Abstract：Life cycle assessment was used to compare the environmental impact of two disposal ways for spent bleaching clay: co-processing in a cement kiln and incineration in common hazardous waste incinerator. Three environmental impact categories, human health (HH), ecosystem quality (EQ) and resource (R) were quantified. Co-processing in cement kiln was more beneficial for sustainable development of environment than common incineration. The environment burdens were -1.03, 0.273Pt for co-processing and incinerating system, respectively. The whole burden in co-processing system was reduced by a factor of 479%, compared to that in incinerating system. The reduction rates for HH, EQ and R were 413%, 479% and 36.9%, respectively. EQ was the most sensitive impact category for both LCA of co-processing and incinerating systems. It contributed greatly for the reduction of environmental burden in co-processing system that raw material mining, which account for 97% of total environmental burden. In the incinerating system, electricity consumption made the greatest contribution for all the 3 environmental impact categories. Dioxin, benzene and heavy metals were the most important factors for co-processing spent bleaching clay in cement kilns, while dust and heavy metals were the most important ones to the incinerating system.
李璐, 黄启飞, 蔡木林, 闫大海. 水泥窑共处置废白土的环境效益分析[J]. 中国环境科学, 2010, 30(6): 808-815.
LI Lu, HUANG Qi-Fei, CAI Mu-Lin, YAN Da-Hai. Environmental benefits of co-processing spent bleaching clay in cement kiln based on life cycle assessment. CHINA ENVIRONMENTAL SCIENCECE, 2010, 30(6): 808-815.
