Department of Water Technology and Environmental Engineering, Faculty of Environmental Technology, Institute of Chemical Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic E-mail:
Pontificia Universidad Javeriana Bogota, Department of Chemistry, Faculty of Science, Pontificia Universidad Javeriana, Carrera 7 N. 40-62, Bogotá D.C., Colombia.
Water Sci Technol. 2014;69(4):803-9. doi: 10.2166/wst.2013.779.
Biogas, digested sludge and sludge liquor are the main products of anaerobic sludge digestion. Each of the products is influenced significantly by specific conditions of the digestion process. Therefore, any upgrade of the digestion technology must be considered with regard to quality changes in all products. Microaeration is one of the methods used for the improvement of biogas quality. Recently, microaeration has been proved to be a relatively simple and highly efficient biological method of sulfide removal in the anaerobic digestion of biosolids, but little attention has been paid to comparing the quality of digested sludge and sludge liquor in the anaerobic and microaerobic digestion and that is why this paper primarily deals with this area of research. The results of the long-term monitoring of digested sludge quality and sludge liquor quality in the anaerobic and microaerobic digesters suggest that products of both technologies are comparable. However, there are several parameters in which the 'microaerobic' products have a significantly better quality such as: sulfide (68% lower) and soluble chemical oxygen demand (COD) (33% lower) concentrations in the sludge liquor and the lower foaming potential of the digested sludge.
沼气、消化污泥和污泥液是厌氧污泥消化的主要产物。每种产物都受到消化过程特定条件的显著影响。因此，任何消化技术的升级都必须考虑到所有产品的质量变化。微曝气是改善沼气质量的方法之一。最近，微曝气已被证明是一种相对简单且高效的生物方法，可用于去除生物固体厌氧消化中的硫化物，但很少有人关注比较厌氧和微曝气消化中消化污泥和污泥液的质量，这就是为什么本文主要研究这一领域。长期监测厌氧和微曝气消化器中消化污泥质量和污泥液质量的结果表明，这两种技术的产物具有可比性。然而，有几个参数表明，“微曝气”产品的质量显著更好，例如：污泥液中的硫化物（低 68%）和可溶解化学需氧量（COD）（低 33%）浓度，以及消化污泥的起泡潜力更低。
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