Wastewaters are commonly categorized as domestic wastewater
or industrial wastewater. Domestic wastewater refers to
wastewater generated from “non-manufacturing activities”
occurring in residential homes which includes sewage (from toilets)
and grey water (from bathrooms and kitchens). There are
many types of industrial wastewater based on the different
industries and contaminants; each sector produces its own particular
combination of pollutants. Wastewaters are typically contaminated
with physical, chemical and biological composition
which has tremendous negative impact on environment, where it
has the ability to destroy many animal habitats, and cause irreparable
damage to many ecosystems. Wastewater treatment processes
are designed to achieve improvements of the wastewater
quality. The two main reasons for collecting and treating wastewater
are to prevent water-borne transmission of disease and to
preserve the aquatic environment