The removal of soluble organic carbon from synthetic winery wastewater by repeated application to soil

• J.A. Chapman ^[1] ; R.I. Correll ^[3] ; J.N. Ladd ^[2]
  1. [1] University of Adelaide

     University of Adelaide

     Australia

     
  2. [2] Commonwealth Scientific and Industrial Research Organisation

     Commonwealth Scientific and Industrial Research Organisation

     Australia

     
  3. [3] Biometrics Unit, Institute of Natural Resources and Environment, CSIRO

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• Localización: Australian journal of grape and wine research, ISSN 1322-7130, Vol. 1, Nº 2, 1995, págs. 76-85
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • The removal of soluble organic carbon from synthetic winery wastewater containing uniformly 14Clabelled lactic acid and glycerol applied repeatedly to soils sampled at various depths from a brown earth and solod was determined from decreases in the solution concentration of 14C of soil extracts. A previously developed logistic model was used to quantify the adsorption and microbial metabolism of the 14C‐compounds in the various soil layers. Adsorption of 14C‐compounds to soil particles resulted in the removal of 10 to 50% of the added 14C within the first hour after wastewater application. It was greater in soils containing a higher percentage of clay and/or organic carbon. Repeating wastewater applications up to 17 times reduced initial adsorption by most of the soil layers of the brown earth, whereas little change occurred in the solod. Microbial uptake and metabolism were responsible for the removal of 14C‐compounds remaining in solution to less than 5% of 14C input. In contrast with their effect on adsorption, repeated applications of wastewater decreased or eliminated the lag period before the onset of rapid metabolism and also increased the rates of metabolism of 14C‐compounds in all soils. This led to significant reductions in the removal times of the soluble‐14C. Acclimatisation of microbial populations in soils newly exposed to the wastewater was most rapid within the uppermost layers. Acclimatised soils were able to reduce the solution concentration of 14C to less than 5% of input levels within 1 d after application when the lag period lasted less than 2 h, and when the daily removal of solution‐14C, due to microbial metabolism, exceeded the 14C input. Regular applications of wastewater were required to maintain rapid removal of the soluble‐14C in acclimatised soils. Implications for managing the disposal of wastewaters rich in organic material on new and existing sites are discussed.