Infodoc : Sciences, Techniques et Culture

1 Activated sludge process and main variants
1.1 Introduction
1.2 Variants of the activated sludge process
2 Principles of organic matter removal in continuous-flow activated sludge systems
2.1 Preliminaries
2.2 Sludge age in activated sludge systems
2.3 Suspended solids concentration in the reactor
2.4 Calculation of the reactor volume
2.5 Substrate removal
2.6 Soluble BOD and total BOD in the effluent
2.7 Sludge digesti[...]

1 Activated sludge process and main variants
1.1 Introduction
1.2 Variants of the activated sludge process
2 Principles of organic matter removal in continuous-flow activated sludge systems
2.1 Preliminaries
2.2 Sludge age in activated sludge systems
2.3 Suspended solids concentration in the reactor
2.4 Calculation of the reactor volume
2.5 Substrate removal
2.6 Soluble BOD and total BOD in the effluent
2.7 Sludge digestion in the reactor
2.8 Recirculation of the activated sludge
2.9 Production and removal of excess sludge
2.10 Oxygen requirements
2.11 Nutrient requirements
2.12 Influence of the temperature
2.13 Functional relations with the sludge age
3 Design of continuous-flow activated sludge reactors for organic matter removal
3.1 Selection of the sludge age
3.2 Design parameters
3.3 Physical configuration of the reactor
3.4 Design details
4 Design of activated sludge sedimentation tanks
4.1 Types of sedimentation tanks
4.2 Determination of the surface area required for secondary sedimentation tanks
4.3 Design details in secondary sedimentation tanks
4.4 Design of primary sedimentation tanks
5 Design example of an activated sludge system for organic matter removal
5.1 Introduction
5.2 Model parameters and coefficients
5.3 Design of the conventional activated sludge system
5.4 Summary of the design
6 Principles of biological nutrient removal
6.1 Introduction
6.2 Nitrogen in raw sewage and main transformations in the treatment process
6.3 Principles of nitrification
6.4 Principles of biological denitrification
6.5 Principles of biological phosphorus removal
7 Design of continuous-flow systems for biological nutrient removal
7.1 Biological nitrogen removal
7.2 Biological removal of nitrogen and phosphorus
8 Intermittent operation systems (sequencing batch reactors)
8.1 Introduction
8.2 Principles of the process
8.3 Process variants
8.4 Design criteria for sequencing batch reactors
8.5 Design methodology for sequencing batch reactors
8.6 Design example of a sequencing batch reactor
9 Activated sludge for the post-treatment of the effluents from anaerobic reactors
9.1 Design criteria and paramerters
9.2 Design example of an activated sludge system for the post-treatment of the effluent from a UASB reactor
10 Biological selectors
10.1 Introduction
10.2 Types of selectors
11 Process control
11.1 Introduction
11.2 Basic concepts of process control
11.3 Dissolved oxygen control
11.4 Solids control
11.5 Monitoring the system
12 Identification and correction of operational problems
12.1 Introduction
12.2 High concentrations of suspended solids in the effluent
12.3 High BOD concentrations in the effluent
12.4 High ammonia concentrations in the effluent
13 Basic principles of aerobic biofilm reactors
13.1 Introduction
13.2 Classification of aerobic biofilm reactors
13.3 Formation, structure and behaviour of biofilms
14 Trickling filters
14.1 Description of the technology
14.2 Design criteria
14.3 Construction aspects
14.4 Operational aspects
15 Rotating biological contactors
15.1 Introduction
15.2 Description of the technology
15.3 Design criteria
15.4 Construction aspects and characteristics of the support medium
16 Submerged aerated biofilters
16.1 Introduction
16.2 Description of the technology
16.3 Design criteria
16.4 Construction aspects
16.5 Operational aspects
References