Under the EU's urban waste-water treatment directive, sewage discharged into the sea should receive primary and secondary treatment, which uses microorganisms to break down the wastes.
42.
In 1972, federal and state laws mandated primary and secondary treatment for all municipal sewer systems, effectively taking the option for lesser treatment plants away from states.
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In 1974, federal and state clean-water regulations required the plant to draw up a secondary treatment plan, which would result in cleaner water going into the river.
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The requirement to perform secondary treatment on wastewater before ocean discharge was waived by the EPA in 1995, " taking into account the city's unique circumstances ".
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Sedimentation tanks called " secondary clarifiers " remove flocs of biological growth created in some methods of secondary treatment including activated sludge, trickling filters and rotating biological contactors.
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With federal help, Vancouver-area governments are spending about $ 196 million ( Canadian ) for a secondary treatment plant at Lulu Island, on the Fraser River south of Vancouver.
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Where natural waterways are too small to rapidly oxidize primary treated sewage, the liquid may be used to intermittent sand filtration until more compact secondary treatment bioreactors became available.
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Discharges to the river were still of poor quality, and a secondary treatment process was designed, although its implementation was delayed by the onset of the First World War.
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After a period, which allows most of the organic material to settle out, the liquor passes over weirs at the end of the settlement tanks to the secondary treatment process.
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The district has recently negotiated a deadline extension until July 2000 for delivery of a waste management plan, designed to include a schedule for upgrading to primary and secondary treatment.
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