The composition of wastewater varies widely. This is a partial list of what it may contain: Water (more than 95 percent), which is often added during flushing to carry waste down a drain; Pathogens such as bacteria, viruses, prions and parasitic worms; Non-pathogenic bacteria; Organic particles such as feces, hairs, food, vomit, paper fibers, plant material, humus, etc.; Soluble organic material such as urea, fruit sugars, soluble proteins, drugs, pharmaceuticals, etc.; Inorganic particles such as sand, grit, metal particles, ceramics, etc.; Soluble inorganic material such as ammonia, road-salt, sea-salt, cyanide, hydrogen sulfide, thiocyanates, thiosulfates, etc.; Animals such as protozoa, insects, arthropods, small fish, etc.; Macro-solids such as sanitary napkins, nappies/diapers, condoms, needles, children's toys, dead animals or plants, etc.; Gases such as hydrogen sulfide, carbon dioxide, methane, etc.; Emulsions such as paints, adhesives, mayonnaise, hair colorants, emulsified oils, etc.; Toxins such as pesticides, poisons, herbicides, etc. Pharmaceuticals and hormones. |
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