Algal bloom | ecology | Britannica (original) (raw)

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water pollution

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  In water pollution: Domestic sewage
  …and rapid growths known as algal blooms. When the algae die, oxygen dissolved in the water declines because microorganisms use oxygen to digest algae during the process of decomposition (see also biochemical oxygen demand). Anaerobic organisms (organisms that do not require oxygen to live) then metabolize the organic wastes, releasing…
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