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The small bubbles adhere to the suspended matter causing the suspended matter to float to the surface of the water where it may then be removed by a skimming device. Induced gas flotation is very widely used in treating the industrial wastewater effluents from oil refineries , petrochemical and chemical plants , natural gas processing plants ...
The 830-by-550-foot (250 by 170 m) plant, which is bigger than Yankee Stadium, [20] is the city's first water filtration plant. [21] The plant was built after the U.S. Environmental Protection Agency (EPA), the U.S. Department of Justice and the State of New York filed suit against the city in 1997 for violating the Safe Drinking Water Act and ...
Raw water is delivered to the filtration plant by the New Croton Aqueduct and the Jerome Park Reservoir. [2] The Croton plant has a capacity of 320 million U.S. gallons (1.2 billion liters) per day and is designed to remove 99.9% of Giardia cysts, Cryptosporidium, and viruses. The system uses conventional drinking water treatment technologies:
In 1998, the city started its program to expand the facility. Construction was completed in 2014, and the plant remained opened throughout the renovation process. [10] The plant can now handle 310 million gallons of waste water per day, with about 250 million gallons being the daily average, [4] representing about 18% of the city's wastewater.
The city's wastewater is collected through an extensive grid of sewer pipes of various sizes and stretching over 7,400 miles (11,900 km). The Bureau of Wastewater Treatment (BWT) operates 14 water pollution control plants treating an average of 1.3 billion US gallons (4,900,000 m 3) of wastewater a day; 96 wastewater pump stations: 8 dewatering facilities; and 490 sewer regulators.
When pouring water from a higher container to a lower one, particles floating in the latter can climb upstream into the upper container. A definitive explanation is still lacking: experimental and computational evidence indicates that the contamination is chiefly driven by surface tension gradients, however the phenomenon is also affected by ...
Water flows by gravity through the aqueduct at a rate of about 4 feet per second (1.2 m/s). [ 6 ] The Catskill Aqueduct has an operational capacity of about 550 million US gallons (2,100,000 m 3 ) per day north of the Kensico Reservoir in Valhalla, New York .
The UV facility treats water delivered by two of the city's aqueduct systems, the Catskill Aqueduct and the Delaware Aqueduct, via the Kensico Reservoir. [3] (The city's third supply system, the New Croton Aqueduct, has a separate treatment plant. [4]) The plant has 56 energy-efficient UV reactors, and cost the city $1.6 billion.