Sewage sludge stabilization indicators in aerobic digestion – a review
Journal Title: Annals of Warsaw University of Life Sciences – SGGW. Land Reclamation - Year 2012, Vol 44, Issue 2
Abstract
Raw sludge is a waste product that originates in the process of wastewater treatment. The sludge characterizes itself by significant ability to putrefaction, emission of odors and low ability to dewater. In addition, pathogenic bacteria, viruses and parasites exist in the sludges. This is the reason why they must be stabilized and disposed in order to eliminate or reduce unwanted or harmful features. There are several ways of sludge treatment with use of biological, chemical, and thermal methods. Biological methods, however, are most commonly used. Among these methods anaerobic fermentation or aerobic stabilization are usually in use. Aerobic digestion is basically used for small amounts of sludges, thus in small and medium-sized wastewater treatment plants. The process involves the removal of organic matter present in the sludge under aerobic conditions by microorganisms. There are various types of aerobic stability, differing with the temperature of the process or tanks in which the process is carried out. The paper presents sewage sludge stabilization indicators, which can be divided into physicochemical and biological activity parameters. These indicators are reduction of volatile suspended solids, total organic carbon, chemical oxygen demand, specific oxygen uptake rate and dehydrogenase activity. The paper shows the comparison of the results obtained by many foreign and Polish authors. The review of sewage sludge stabilization indicators also consists of the influences of some of other factors on volatile suspended solids.
Authors and Affiliations
Monika KAZIMIERCZAK
Keywords
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