Nitrification and Denitrification in the Activated Sludge Process
Of special interest to wastewater treatment plant operators are the bacteria that degrade nitrogenous wastes–the nitrifying bacteria–and the bacteria that degrade carbonaceous wastes–the cBOD-removing bacteria. Both groups of bacteria need to be routinely monitored and operational conditions favorably adjusted to ensure desired nitrification. Each chapter in this groundbreaking study offers a better understanding of the importance of nitrification and denitrification and the bacteria involved in these crucial processes. Chapters include:
- The Wastewater Nitrogen Cycle
- Nitrite Ion Accumulation
- Dissolved Oxygen
- Denitrifying Bacteria
- Gaseous End Products
- Free Molecular Oxygen
- The Occurrence of Denitrification
PART I: OVERVIEW.
1 Nitrogen: Environmental and Wastewater Concerns.
2 The Oxidation States of Nitrogen.
3 Nitrogenous Compounds.
5 The Activated Sludge Process.
PART II: NITRIFICATION.
6 Introduction to Nitrification.
7 Nitrifying Bacteria.
9 The Wastewater Nitrogen Cycle.
10 Nitrogen Assimilation.
11 Forms of Nitrification.
12 Indicators of Nitrification.
13 Nitrite Ion Accumulation.
15 Dissolved Oxygen.
16 Alkalinity and pH.
18 Inhibition and Toxicity.
19 Mode of Operation.
20 Classification of Nitrification Systems.
21 Troubleshooting Key and Tables.
PART III: DENITRIFICATION.
22 Introduction to Denitrification.
23 Denitrifying Bacteria.
24 Biochemical Pathway and Respiration.
25 Gaseous End Products.
26 Sources of Nitrite Ions and Nitrate Ions.
27 Operational Factors Influencing Denitrification.
28 Substrate or cBOD.
29 Free Molecular Oxygen.
30 The Occurrence of Denitrification.
31 Monitoring and Correcting Accidental Denitrification.
33 Benefits of Denitrification.
APPENDIX I: THE GRAM STAIN.
APPENDIX II: F/M, HRT, MCRT.
Abbreviations and Acronyms.
Chemical Compounds and Elements.