Anaerobic Digestion

5.1 Introduction

5.1.1 Advantages and disadvantages

5.1.2 Theory of anaerobic digestion

5.2 Environmental factors

5.2.1 Solids and hydraulic retention times

5.2.2 Temperature

5.2.3 pH and alkalinity

5.2.4 Toxic materials

5.3 Process variations

5.3.1 Low-rate digestion

5.3.2 High-rate digestion Heating

Auxiliary mixing Thickening Uniform feeding

5.3.3 Thermophilic digestion

5.3.4 Two-stage digestion

5.3.5 Two-phase digestion

5.4 Process design

5.4.1 Per capita basis

5.4.2 Solids loading

5.4.3 Solids retention time

5.4.4 Volatile solids reduction

5.4.5 Gas production

5.5 System component design

5.5.1 Tank design

5.5.2 Digester covers

5.5.3 Mixing

Pumped recirculation Mechanical mixing Gas mixing

Wastewater Sludge Processing, By Izrail S. Turovskiy and P. K. Mathai Copyright © 2006 John Wiley & Sons, Inc.

5.5.4 Heating

Heating requirements Heating equipment

5.5.5 Gas usage

5.6 Operational considerations

5.6.1 Reactor performance

5.6.2 Odor control

5.6.3 Supernatant

5.6.4 Struvite

5.6.5 Digester cleaning

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