title: Long-term leaching behavior of phenol in cement/activated-carbon solidified/stabilized hazardous waste.
abstract: The long-term leaching behavior of phenol in solidified/stabilized (S/S) hazardous wastes cured for 28 d with different amounts of activated carbon (AC) was investigated using synthetic inorganic acid (H(2)SO(4):HNO(3) = 2:1, pH = 3.2), acetic acid buffer (HAc/NaAc, pH = 4.93), and deionized water as leachants to simulate the leaching of phenol in three exposure scenarios: acid-precipitation, co-disposal, and neutral-precipitation. Phenol immobilization was enhanced by AC adsorption and impaired by the growth of micropores with increasing amount of AC; thus the optimal added amount of AC to be to added S/S wastes was 2%. The leaching behavior of phenol in co-disposal scenario was unpredictable due to inadequate ionization of HAc in the HAc-NaAc buffer solution. The findings indicated that S/S products should be disposed of in hazardous waste landfills rather than municipal solid waste landfills.
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, School of Environment, Tsinghua University, Beijing 100084, PR China. jgliu@mail.tsinghua.edu.cn
authors.forename: Jianguo
authors.initials: J
authors.lastname: Liu
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Nie
authors.forename: Xianwei
authors.initials: X
authors.lastname: Zeng
authors.forename: Zhaoji
authors.initials: Z
authors.lastname: Su
mesh_terms: D002606:Charcoal / Q000737:chemistry*; D003252:Construction Materials / Q000032:analysis*; D006256:Hazardous Waste / Q000032:analysis*; D019800:Phenol / Q000737:chemistry*
chemical_list: D006256:Hazardous Waste; D002606:Charcoal; D019800:Phenol