The water entering a sewage treatment plant majorly consists of waste water from households, offices and a small amount of industrial waste water. Most effluent treatment systems deal with wastewater coming from an industrial process which is relatively very high in organic loading, along with various chemicals compounds which are tough to treat. Due to the high volumes of water it contains, sewage water treatment becomes a challenge for treatment at a rapid pace. Industrial wastewater on the other hand is concentrated with organic and inorganic pollutants, and therefore difficult to treat on most occasions due to these high concentrations. This is why the general population of microbes in sewage treatment differ from those present in effluent waste water treatment plants.