Residential wastewater is a combination of various types of toxic waste present in flush water and all types of wastewater generated from every room in a house. It is generally known as sewage and is much diluted. There are two types of domestic sewage: black-water or wastewater from toilets, and grey water, which is wastewater from all sources except toilets. Black-water and gray-water have different characteristics, but both contain pollutants and carry agents which can cause lethal diseases. Sewage varies regionally in the United States and from home to home. These are based on issues such as the number and type of water-using fixtures and appliances used at homes and even their habits, such as the types of food they eat.
In places such as industrial complexes, factories, offices, restaurants, farms and hospitals non-residential wastewater characteristics, communities need to evaluate each source individually to ensure that sufficient water treatment is provided. For example, laundries differ from many other industrial sources because they produce high volumes of wastewater containing lint fibers. Restaurants typically generate a lot of oil and grease. In addition, many industries produce wastewater high in chemical and biological pollutants that, can overburden onsite and community wastewater treatment systems.
Storm-water is a nonresidential source and carries trash and other pollutants from streets, as well as pesticides and fertilizers from yards and fields. Communities may require these types of nonresidential sources to provide preliminary treatment to protect community systems and public health.
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