Characteristic Study of Dissolved Organic Matter for Electron Transfer Capacity during Initial Landfill Stage

Abstract To investigate the evolution law and influenced factors of dissolved organic matter (DOM) for electron transfer capacity during initial landfill stage, DOM was extracted from landfill wastes at different depth. Shewanella oneidensis MR-1 and citrate iron (FeCit) were used as electron donor and electron acceptor to measure electron donating capacity, electron accepting capacity and electron shuttling capacity, respectively. Afterwards, the influenced factors of electron transfer capacity were studied by spectral analysis. The results showed that protein-like components and humic-like components were able to transfer electrons, and they also accepted electrons from microorganisms. Electron donating capacity and electron accepting capacity increased firstly and then decreased. However, electron shuttling capacity increased persistently during the landfill process. Protein-like components were the main components of dissolved organic matter during the initial landfill stage, and it was mainly responsible for the electron donoring capacity and electron accepting capacity of DOM. Electron shuttling capacity resulted from humic-like components during the cyclic redox process. Electron shuttling capacity persistently increased during the landfill process based on humic-like components generated during the stage.