Ellis Island was the principal federal immigration station in the United States from 1892 to 1954. More than 12 million immigrants were processed here. Over time, the immigration station spread over 3 connected islands with numerous structures including a hospital and contagious disease wards.
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treatment processes are typically used for the treatment of waste that has a high concentration of. biodegradable organic material. Anoxic and anaerobic processes do not require the input of. oxygen, which is typically an energy intensive process in aerobic systems. 5-1 Anoxic systems. Anoxic processes are typically used for the removal of nitrogen from wastewater. The process of. biological nitrogen removal is known as denitrification. Denitrification requires that nitrogen be. first converted to nitrate, which typically occurs in an aerobic treatment process such as a trickling.