The city of Jackson, Mississippi, is served by two surface water treatment plants: the 25-
million-gallon-per-day (mgd) O.B. Curtis plant; and, the 42-mgd J.H. Fewell plant. To
meet increasing water demands and future water quality regulations, the city is expanding
the O.B. Curtis facility to 50 mgd with the addition of a new 25 mgd ultrafiltration (UF)
membrane facility. In addition to the onsite addition of the UF membrane plant,
improvements include:
expansion of the raw water pump station;
modifications to the chemical systems and sedimentation basins;
new ultraviolet (UV) disinfection for the conventional filters;
addition of a second clear well; and,
new conventional plant human machine interface/programmable logic controller
(HMI/PLC) control system, high-service pump station, and closed circuit television
security system.
Since the UF membrane facility will treat coagulated/flocculated water and then be
pumped to the new clear well, controlling the raw water flow and chemical feed addition
prior to its reaching the membrane system is critical. This paper demonstrates the difficulty of
incorporating the UF membrane plant instrumentation with the overall conventional plant
supervisory control and data acquisition (SCADA) system. To avoid problems in the construction phase, it was essential that consideration
be given during the design phase to process design, construction sequencing, and
conventional plant HMI/PLC control systems design. Consideration also had to be given
to merging the new stand-alone HMI/PLC UF membrane plant control system with the
new conventional plant HMI/PLC control system, thus forming a single plant-wide
control system. Because the UF membrane operation relies on proper raw water flow
rates and dosing of chemicals, responsibility for control of these systems belongs to the
UF membrane manufacturer.
This paper provides insight into the decision making process of the design team as
they worked together with the UF membrane system supplier to incorporate the new UF
membrane control system into the overall conventional plant control system.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 230 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 5 |
| Published : | 06/01/2006 |
