Abstract
Total automated process control of a full-scale wastewater treatment facility was successfully achieved using a programmable logic controller. This facility includes three (3) sequencing batch reactors, three (3) downflow pressure filters, and two (2) ultraviolet disinfection units. The control system routinely manipulates 68 equipment items within the plant, as well as continuously monitoring the operational status of all such equipment. The controller also handles emergency startup/shutdown conditions, cycling of redundant equipment items, and equipment failure situations. In addition, telephone→modem communication with the controller can be obtained to facilitate remote system evaluation and troubleshooting. National recognition of the engineering design excellence and innovation applied to this unique automated facility was recently awarded by the American Consulting Engineers Council, with its designation of this plant as one of the top ten engineering projects within the United States for 1986.
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