Primary treatment is a physical process that removes material that will settle out. Secondary treatment is a biological process that converts most of the suspended material into inorganic compounds and microbial biomass. Tertiary treatment is designed to remove phosphates and nitrates. Anaerobic digestion converts much of the organic matter to methane. Septic tanks are individual sewage treatment systems.
■ What does the term BOD mean? What is its significance?
■ Why is the advantage of removing phosphates and nitrates during tertiary treatment?
■ Why would the processes of secondary treatment preclude denitrification?
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