Chemical Characteristics of Sewage
Domestic sewage contains 99.9% water, 0.02-0.03% suspended solids and other inorganic (30%) and organic (70%) substances. Inorganic components include ammonia, chloride salts and metals. Metal industries and mines also contribute to the inorganics. Organic components include either nitrogenous compounds like proteins and amino acids and non-nitrogenous compounds like carbohydrates and lipids. Animal sewage is high in protein and lipids and plant sewage is rich in cellulose and lignin. Lipids in the form of fatty acids which escape digestion in the digestive system account for the lipids in the faeces.
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