<Li> Pharmaceuticals and hormones and other hazardous substances </Li> <Li> Thermal pollution from power stations and industrial manufacturers </Li> <P> If the wastewater contains human feces, as is the case for sewage, then it may also contain pathogens of one of the four types: </P> <Ul> <Li> Bacteria (for example Salmonella, Shigella, Campylobacter, Vibrio cholerae), </Li> <Li> Viruses (for example hepatitis A, rotavirus, enteroviruses), </Li> <Li> Protozoa (for example Entamoeba histolytica, Giardia lamblia, Cryptosporidium parvum) and </Li> <Li> Parasites such as helminths and their eggs (e.g. Ascaris (roundworm), Ancylostoma (hookworm), Trichuris (whipworm)); </Li> </Ul>

Waste water that contain solid and liquid excreta refers to