Cecilton Wastewater Treatment Plant

Project Description

Carew Associates coordinated the design of the electrical power distribution system and control system with the proposed facility design by URS Corporation to provide a safe and reliable system. Our company also performed heating, ventilation, and air conditioning design for this project.

The electrical power distribution system included the upgrade of the 480-volt 3-phase service to 400-amps and addition of a 150 kW standby power generation system with automatic transfer switch. The generator is capable of carrying the entire plant load in the event of a power outage. Transient Voltage Surge Suppression has been included throughout the distribution system to protect equipment from electrical transients caused by lightning and other disturbances.

The design of the major processing area of the proposed plant, the SBR, included a vendor supplied programmable logic controller (PLC). In order to simplify the operation of the facility, Carew consulted with the vendor and determined that the balance of the plant would also be controlled by that vendor’s PLC. A remotely located building was provided with a Remote I/O panel which communicated to the main controller via a ControlNet network.

Carew modified the vendor’s specifications to provide a functional description for all ancillary equipment. In addition to the control functions, Carew specified the interaction of the vendor’s PLC with the facility’s autodialer which is used for remote alarm notification.

The facility design included an alum tank filling control panel with an ultrasonic level sensor and outdoor mounted display, to inform the tanker operator of the tank level and prevent spills.