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The Millard H. Robbins, Jr Water Reclamation Plant, which is operated by the Upper Occoquan Service Authority (UOSA), is located in Centreville, VA and it was formerly known as the Upper Occoquan Sewage Authority. UOSA serves the western portions of Fairfax and Prince William Counties, and the Cities of Manassas and Manassas Park. The Millard H. Robbins Water Reclamation Plant is a state-of-the-art plant that includes primary-secondary treatment and the following advanced waste treatment processes: chemical clarification, two-stage recarbonation with intermediate settling, multimedia filtration, granular activated carbon adsorption, chlorination for disinfection and dechlorination. The plant’s rated capacity is per day (mgd). UOSA operates under a Virginia Pollutant Discharge Elimination System (VPDES) Permit, which is issued by the Department of Environmental Quality (DEQ). The Permit limitations listed in Table 1 are among the most stringent in the State of Virginia and possibly in the United States. :Table 1: UOSA Permit Limits : ==History== In the 1960s, the Occoquan Watershed began its transformation from a largely rural area to a predominately urban/suburban region. This rapid growth resulted in deterioration of water quality in the nearly Occoquan Reservoir, a principal drinking water supply for Northern Virginia. In 1971, the Virginia Water Control Board, in agreement with the Virginia Department of Health, adopted a bold and innovative policy. The Occoquan Policy mandated the creation of a regional agency, the Upper Occoquan Service Authority (UOSA), to provide state-of-the-art treatment for all wastewater generated in the Occoquan Watershed, and an independent organization, the Occoquan Watershed Monitoring Laboratory (OWML), to continuously monitor the Watershed and provide advice on protective measures for the Reservoir. In 1978, the UOSA Regional Water Reclamation Plant located on in western Fairfax County, commenced operations and replaced eleven small secondary treatment plants in the region. Since that time, water quality in the Occoquan Reservoir has steadily improved and the reliable, high-quality effluent produced by UOSA has increased the safe yield of the Reservoir. Through several expansions, the initial per day capacity of UOSA was increased to 32 mgd, and a major expansion to has been completed. After 30 years of highly successful operations, UOSA reclaimed water is an increasingly important component of the drinking water supply strategy for the Washington metropolitan area. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Upper Occoquan Sewage Authority」の詳細全文を読む スポンサード リンク
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