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Marine outfall

Ocean outfall pipes in Cape May, New Jersey, United States - pipes exposed after the sand was removed by severe storm

A marine outfall (or ocean outfall) is a pipeline or tunnel that discharges municipal or industrial wastewater, stormwater, combined sewer overflows (CSOs), cooling water, or brine effluents from water desalination plants to the sea. Usually they discharge under the sea's surface (submarine outfall). In the case of municipal wastewater, effluent is often being discharged after having undergone no or only primary treatment, with the intention of using the assimilative capacity of the sea for further treatment. Submarine outfalls are common throughout the world and probably number in the thousands. The light intensity and salinity in natural sea water disinfects the wastewater to ocean outfall system significantly.[1] More than 200 outfalls alone have been listed in a single international database maintained by the Institute for Hydromechanics at Karlsruhe University for the International Association of Hydraulic Engineering and Research (IAHR) / International Water Association (IWA) Committee on Marine Outfall Systems.[2]

The world's first marine outfall was built in Santa Monica, United States, in 1910. In Latin America and the Caribbean there were 134 outfalls with more than 500 m length in 2006 for wastewater disposal alone, according to a survey by the Pan American Center for Sanitary Engineering and Environmental Sciences (CEPIS) of PAHO. According to the survey, the largest number of municipal wastewater outfalls in the region exist in Venezuela (39), Chile (39) and Brazil (22).[2] The world's largest marine outfall stems from the Deer Island Waste Water Treatment Plant located in Boston, United States.[3] Currently, Boston has approximately 235 miles of combined sewers and 37 active CSO outfalls. Many outfalls are simply known by a public used name, e.g. Boston Outfall.[4][5][6][7]

  1. ^ Yang, Lei; Chang, Wen-Shi; Lo Huang, Mong-Na (2000-02-15). "Natural disinfection of wastewater in marine outfall fields". Water Research. 34 (3): 743–750. Bibcode:2000WatRe..34..743Y. doi:10.1016/S0043-1354(99)00209-2. ISSN 0043-1354.
  2. ^ a b Outfalls Database Archived 2008-06-28 at the Wayback Machine Click on "Activities", then "Outfalls repository", then "database", then "Output"
  3. ^ "Combined Sewer Systems and Outfall Maps".
  4. ^ OUTFALLS DATABASE AND INFORMATION EXCHANGE Archived 2015-07-28 at the Wayback Machine
  5. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2015-08-24.{{cite web}}: CS1 maint: archived copy as title (link)
  6. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2015-08-24.{{cite web}}: CS1 maint: archived copy as title (link)
  7. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2015-08-24.{{cite web}}: CS1 maint: archived copy as title (link)

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