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wastewater include: industrial site drainage (silt, sand, alkali, oil, chemical residues); industrial cooling waters ( biocides , heat, slimes, silt) industrial processing waters organic or biodegradable waste including waste from hospitals , abattoirs , creameries , and food factories. organic or non
), viruses (for example hepatitis a , rotavirus , enteroviruses ), protozoa (for example entamoeba histolytica , giardia lamblia , cryptosporidium parvum ) and parasites such as helminths and their eggs (e.g. ascaris (roundworm), ancylostoma (hookworm) and trichuris (whipworm)); it can also contain non-pathogenic...
https://en.wikipedia.org/wiki/Wastewater