Preface. PART I: OVERVIEW. 1 Nitrogen: Environmental and Wastewater Concerns. 2 The Oxidation States of Nitrogen. 3 Nitrogenous Compounds. 4 Bacteria. 5 The Activated Sludge Process. PART II: NITRIFICATION. 6 Introduction to Nitrification. 7 Nitrifying Bacteria. 8 Organotrophs. 9 The Wastewater Nitrogen Cycle. 10 Nitrogen Assimilation. 11 Forms of Nitrification. 12 Indicators of Nitrification. 13 Nitrite Ion Accumulation. 14 BOD. 15 Dissolved Oxygen. 16 Alkalinity and pH. 17 Temperature. 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. 32 Zoning. 33 Benefits of Denitrification. APPENDIX I: THE GRAM STAIN. APPENDIX II: F/M, HRT, MCRT. References. Abbreviations and Acronyms. Chemical Compounds and Elements. Glossary. Index.
MICHAEL H. GERARDI is Research Project Associate and Instructor at the Pennsylvania State University in Linden, Pennsylvania.