Reverse Osmosis Water Treatment Plant Design Services
The City of Vero Beach owns and operates a 3.3-mgd reverse osmosis water treatment facility and planned to increase its capacity. The previous reverse osmosis skid was rated at 2 mgd, and the city expanded the capacity of the facility to 4.5 mgd to improve the finished water quality and decrease the operation of the lime softening plant.
CHA provided design, permitting, bidding, and limited construction management services during construction of the expansion of the facility. The major design elements included improvement to the existing reverse osmosis skid, which included modifications to the permeate header, the addition of valves and a flow meter in order to balance and control the flows between Stage 1 and Stage 2, and piping associated with the use of five unused pressure vessels; the addition of two 1.25-mgd reverse osmosis membrane skids; and the evaluation and upgrade of one of the two existing 250-hp high-pressure pumps. The other 250-hp high-pressure pump was evaluated to determine whether it could be used for one of the 1.25-mgd skids. A third high-pressure pump was designed for the second 1.25-mgd skid.
The sulfuric acid and scale inhibitor feed system was modified to accommodate the increase of chemical demands due to the addition of the two membrane skids. Additional improvements included the replacement of the sulfuric acid bulk tank; electrical upgrades; instrumentation and control modifications; additional PLCs and/or remote input/output (I/O) panels; and finished water quality stability measurement system integration. A spreadsheet-based software was developed and integrated into the SCADA system to predict key post-treatment water quality parameters based on measured water quality and also to determine the water quality in response to potential treatment operation changes.
- Construction Management