High performance turbidity filter


Turbidity in water is caused by suspended and colloidal matter such as clay, silt, finely divided natural organic matter (NOM), inorganic matter and plankton plus other microscopic organisms, according to Standard Methods 2130. Waterborne pathogens have caused significant disease outbreaks in the United States and continue to pose a significant risk. The most frequently reported waterborne disease in the United States is acute gastrointestinal illness, or gastroenteritis. The causes are usually traced to various viruses, bacteria, or protozoa. Effectively filtered turbidity can be correlated with low bacterial counts and low incidences of viral disease.

Inorganic particles provide abundant adsorption sites for bacteria, viruses, metals and other toxic substances. There is some concern that inorganic particulate contamination has the ability to shield microorganisms from inactivation by disinfectants. Organic containing colloids such as humic materials consume significant chlorine, while increasing the concentration of carcinogenic disinfection by-products (DBPs).

Filtration is the key unit process in surface water treatment for removing particles. For conventional and direct filtration systems, the U.S. Environmental Protection Agency (EPA) requires that the turbidity level of filtered water not exceed one Nephelometric Turbidity Unit (NTU) at any time.

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