POTENTIAL SOURCES OF ORGANIC POLLUTION OF AQUATIC ECOSYSTEMS
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FIGURE 13.5 (a) Untreated or incompletely treated domestic waste can be a significant source of organic pollution. Here, a broken sewer line releases 6 tons of raw sewage per second into the ocean off Ipanema Beach in Rio de Janeiro, Brazil. (b) Discharge from land-based aquaculture facilities or waste feed from water-based systems often contains substantial amounts of organic matter. (c) Meanwhile, concentrated animal feeding operations, including cattle feedlots, pig farms, and poultry farms, are a well-known source of organic pollution.
(AP Photo/Douglas Engle) (© photomadnz/Alamy) (David R. Frazier/Science Source)