Whether we are in a residential area or a commercial and industrial area, we all create sewage that has to be treated in some form. Every establishment has waste water that has to be treated at local sewage treatment plants throughout the country. The waste that is treated includes waste from baths, kitchens, toilets and sinks that is flushed away into the sewers. In many areas liquid waste also includes all the liquid from industry and commerce.
Household water is separated into grey water and blackwater. Grey water is used for recycling for watering gardens and for flushing toilets. Combined sewer systems also include all the storm water runoff from the drains when it rains heavily. Combined sewers are a lot more expensive to run as the treatment facilities are larger than sanitary sewers.
In modernised countries you will find many very efficient sewage treatment works and the sanitary conditions that people are living in are very clean and nasty diseases such as Cholera and Dysentery have been eliminated through the efficient sanitary conditions and the sewage treatment plants.
In many of the larger sewage treatment plants oil and grease is removed from the water by passing it through skimmers that skim all of the oil and fat and grease from the water. No matter where you are living in the country there will be a sewage treatment plant to deal with all the waste water.
The water is disinfected to take out all of the microorganisms from the water before it can be discharged back into the water system for using in households and commercial premises again. Chlorination is the most popular way of disinfecting water for use in the home in sinks, baths, showers and for drinking.
Much of the process in sewage treatment plants is designed to mimic the natural process of water treatment in the environment. In many underdeveloped countries you will find that as much as 97% of waste is discharged directly back into the environment. In developed countries you will find that much of the treated waste water is used for agricultural purposes.
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