Long-term leaching behavior of phenol in cement/activated-carbon solidified/stabilized hazardous waste.

Jianguo Liu, Xiaoqin Nie, Xianwei Zeng, Zhaoji Su

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

Journal of environmental management 2013 Jan 30

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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. Copyright © 2012 Elsevier Ltd. All rights reserved.

Citation

Jianguo Liu, Xiaoqin Nie, Xianwei Zeng, Zhaoji Su. Long-term leaching behavior of phenol in cement/activated-carbon solidified/stabilized hazardous waste. Journal of environmental management. 2013 Jan 30;115:265-9