• Introduction

  • Sewage Treatment: In the Beginning

  • Rise and Fall of the Contact Bed

  • Bacteria Beds

  • Activated Sludge Process: Discovery and Early Development

  • Diffused Air Systems: Further Developments

  • Activated Sludge System: Mechanical Aeration

  • Settlement of Humus Sludges and Activated Sludges

  • Conclusions

  • Acknowledgements

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