Abstract
Sewage solids can be separated into three main categories, i.e., the suspended solids, the sewer sediments and the respective biofilm. Each category can affect the sewer conditions, according to their corresponding characteristics, properties and specific processes (biotic or abiotic) taking place. The sulfides in the sewerage system are produced due to biogenic(anaerobic) processes taking place both in the wastewater and in the solids/deposits. The extended formation of sulfides enhances the development of specific microorganisms on the sewer walls, which can subsequently produce biogenic sulfuric acid, capable of corrosion of the (mainly) concrete walls, commonly used for the sewerage network. The Microbiologically Induced Corrosion (MIC) of sewer walls will eventually lead to the degradation/destruction of sewerage (pipes) system. The effect of solids on sulfide formation, and subsequently on the MIC, is the main subject of this chapter. Finally, an overview of general applicable ways to control sulfide formation is described, with a focus on appropriate solids removal.
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