Journal
CHEMOSPHERE
Volume 58, Issue 10, Pages 1309-1318Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2004.10.011
Keywords
sediment DOC; Tea Bag carbon release; tea-colored water; humic acids in water; aerobic carbon decay; microbial respiration and fermentation of peat soil carbon
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Temporary water reservoirs built upon peat soil may exhibit water quality impairment from elevated dissolved organic carbon (DOC). Microbiological decay of the organic carbon in the bed with subsequent release produces tea colored water which may require treatment prior to use. This paper describes laboratory experiments designed to obtain data on the release process of DOC from soils containing 0.65%, 10% and 19% carbon. Parallel experiments with and without sodium azide treatment clearly distinguished the initial release of a porewater residual fraction and the microbial produced fraction. A one to two day quick-release DOC fraction, which ranges from 28% to 50%, first emerged from the bed, Step-1. This was followed by a constant rate of DOC production over four weeks, Step-2. The Step-2 average production rates were 3.4, 12, and 31 mg DOC/kg(dry)/day for the respective soils and increased as soil carbon content increased. The inorganic carbon (IC) behaved oppositely; its rate of production decreased with increasing soil carbon. A consistent and simple rate equation described the Step-2 DOC production process. This and other evidence obtained provided the basis for developing a mathematical, model that couples both steps of the bed-to-water DOC release chemodynamics. The model,is presented in a companion paper (Part-2). (c) 2004 Elsevier Ltd. All rights reserved.
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