They include: process applicability, applicable stream, acceptable circulate variation, influent traits, inhibiting or refractory compounds, climatic aspects, course of kinetics and reactor hydraulics, performance, therapy residuals, sludge processing, environmental constraints, necessities for chemical products, vitality and other resources; requirements for personnel, operating and maintenance; ancillary processes, reliability, complexity, compatibility, space availability. Almost about environmental impacts of sewage remedy plants the following features are included in the choice process: Odors, vector attraction, sludge transportation, sanitary risks, air contamination, soil and subsoil contamination, surface water pollution or groundwater contamination, devaluation of nearby areas, inconvenience to the close by inhabitants. Odors emitted by
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