LearnLocker

Sewage Treatment

  • Grade Level: Senior High (10-12)
  • Produced By: Classroom Video
  • Year: 1991
  • Country: Australia
  • Language: English
  • Running Time: 20m
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The technical response to changing community standards on sewage treatment: 40 years ago - public health; 20 years ago - biochemical oxygen demand; 10 years ago - nutrients: P & N; today - new treatment processes, effluent disposal.