Automation of Water Resource Recovery Facilities. Water Environment Federation

       7.0 PRIMARY SLUDGE AND SCUM CONTROL STRATEGIES

       7.1 Process Description

       7.1.1 Sludge Removal

       7.1.2 Scum Removal

       7.2 Process Variables

       7.3 Controlled Variables

       7.4 Control Strategies

       7.4.1 Sludge Removal Control—Dedicated Pump

       7.4.2 Sludge Removal Control—Valve to Common Pump

       7.4.3 Scum Trough Operation Control

       7.4.4 Scum Pit Level Control

       8.0 ACTIVATED SLUDGE SYSTEM CONTROL STRATEGIES

       8.1 Dissolved Oxygen Control

       8.1.1 Process Description

       8.1.2 Process Variables

       8.1.3 Controlled Variables

       8.1.4 Control Strategies

       8.2 Ammonia Control

       8.2.1 Process Description

       8.2.2 Process Variables

       8.2.3 Controlled Variables

       8.2.4 Control Strategies

       8.3 Denitrification Control

       8.3.1 Process Description

       8.3.2 Process Variables

       8.3.3 Controlled Variables

       8.3.4 Control Strategies

       8.4 Activated Sludge Clarifier Blanket Level Control

       8.4.1 Process Description

       8.4.2 Process Variables

       8.4.3 Controlled Variables

       8.4.4 Control Strategies

       8.5 Waste Sludge Control

       8.5.1 Process Description

       8.5.2 Process Variables

       8.5.3 Controlled Variables

       8.5.4 Control Strategies

       9.0 CHEMICAL FEED SYSTEMS

       9.1 Disinfection Control

       9.1.1 Process Description

       9.1.2 Process Variables

       9.1.3 Controlled Variables

       9.1.4 Control Strategies

       9.1.4.1 Feed-Forward Flow Proportioning

       9.1.4.2 Simple Residual Feedback Control

       9.1.4.3 Flow and Residual Control

       9.2 Dechlorination Control

       9.2.1 Process Description

       9.2.2 Process Variables

       9.2.3 Controlled Variables

       9.2.4 Control Strategies

       9.2.5 Difficult-to-Measure Process Variable

       9.2.6 Time Delays

       9.2.7 Feed-Forward Control

       9.2.8 Feedback and Compound Control

       9.2.9 Two-Step Control

       9.2.10 Dechlorinated Final Effluent Residual Measurement