a) Non-settleable small drops of oil and grease b) Organic and inorganic small solid particles

28 | 2 Wastewater Characterization and Regulations 3. Suspended solids a) Organic particles

- microorganisms (bacteria, viruses, worm eggs, protozoa), mostly non-settle-able

- other organic materials (residual particles from fruits, vegetables, meat, etc.), mostly settleable b) Inorganic particles

- sand, clay, minerals

- partly organic and partly inorganic particles

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