Читать книгу Automation of Water Resource Recovery Facilities - Water Environment Federation - Страница 240

Grit settling velocity control varies by type. Aerated grit systems control settling velocity primarily by controlling the airflow to each unit to maintain organic materials in suspension. For these units, it is typical to control the airflow to each unit to a constant value. For both aerated and other types, the flow through the units is typically kept within a range according to the specification of the units to maintain control and avoid flooding of the system. In some instances, channel level can be used to indicate that more grit units are needed. The grit units in service are controlled by opening the gates to each unit.