Mount Pleasant Waterworks
RO Plant 1, King St.
RO Plant 2, 7th Ave.
RO Plant 3, Labor Camp
Mount Pleasant SC 29464-3927
Tel: 843-884-8048
Mount Pleasant Waterworks Public Works Commission
1619 Rifle Range Road
PO Box 330
Mount Pleasant SC 29465-0330
William L. Golightly, Chairman, Board of Commissioners
Senior Staff:
Clay Duffie, General Manager
Tom Wright, Utilities Division Manager
Susan Mellichamp, Administrative Services Manager
TEL: 803-884-9626
FAX: 803-849-2227
EMAIL: wwadmin@cleanh20.com
Web Page: http://www.cleanh20.com
Larry Pelegrin
Hydranautics
1327 Tatnall Street
Wilmington DE 19801
TEL: 302-658-2565; FAX: 302-658-1365
lpelegrin@de.hydranautics.com
Web site: http://www.membranes.com
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1991, 1992: Larry Pelegrin Hydranautics 1327 Tatnall Street Wilmington DE 19801 TEL: 302-658-2565 FAX: 302-658-1365 lpelegrin@de.hydranautics.com Web site: http://www.membranes.com
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1994: James A. Harn Harn RO Systems Inc. 205 Seaboard Ave. Venice FL 34292 PO Box 879 Nokomis FL 34274-0879 TEL: 941-488-9671 Web site: http://www.aitc.net/webaitc1/harnrosy/
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| Startup Year | 1991, 1992, 1994 |
| Process | RO |
| Capacity (MGD) | 6.8 |
| Recovery Rate (%) | 80 |
| Pretreatment | antic-scalant, pH adjustment, corrosion control |
| Post-Treatment | blending with deep well water from Middendorf Aquifer |
| Feed Water Composition | salinity: 190mg/L, TDS=900mg/L |
| Product Water Composition | salinity: 50mg/L; TDS=60mg/L |
| Concentrate Disposal | discharge to wastewater treatment plant |
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OPERATIONS
CHALLENGE '98
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RO Plant 1 King St. |
RO Plant 2 7th Ave. |
RO Plant 3 Labor Camp |
Charleston CPW Water |
Dispenser #1 King St. |
Dispenser #2 Whipple Rd. | |
pH Units |
8.3 |
8.4 |
8.3 |
8.5 |
7.9 |
6.4 | |
Alkalinity (ppm) |
108 |
106 |
134 |
24 |
25 |
3 | |
Hardness (ppm) |
30 |
29 |
30 |
45 |
4 |
6 | |
Sodium (ppm) |
67 |
64 |
79 |
16 |
15 |
2 | |
Chloride (ppm) |
33 |
31 |
34 |
29 |
9 |
10 | |
Fluoride (ppm) |
0.6 |
0.5 |
0.8 |
1.0 |
0.1 |
0.1 | |
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RO water -- the best drink on tap.The finished water from our reverse osmosis (RO) water treatment plants is a blend of four parts of pure RO water with one part deep well, or source water.
Why do we blend water?The process of reverse osmosis (RO) treatment efficiently and effectively removes dissolved minerals from our ground water supply. Once treated, the water is 100% free of suspended matter and 90% free of dissolved salts, which means the water is very pure. However, very pure water cannot go directly into water system lines without treatment to raise the pH and make the water less agressive to pipes and plumbing. MPW accomplishes this by blending back some of the deep well water with the pure RO water. The water from our deep wells has naturally high pH and alkalinity, which reduces the aggressive nature of pure RO water. It also provides a beneficial amount of fluoride, one of the minerals found naturally in the Middendorf Aquifer.
The Middendorf Aquifer.The Middendorf is between 1800 and 2500 feet deep and is confined between layers of limestone and sand. This means that nothing from the surface can contaminate it. The water is naturally clean, with little or no bacteria. There are dissolved salts, mostly chloride, fluoride, sodium and bicarbonates, which is why RO is the most effective treatment for us to use.The temperature of this water as it comes out of the ground is very warm, about 98 degrees Fahrenheit. Since it doesn't have a chance to cool down during the treatment process, by the time it reaches your home, it's still warm. It may drop as low as 65 degrees in the winter but warms up to as high as 90 degrees in the summer months.
Suggestion: For the best tasting drinking water, bottle your tap water and refrigerate. Need to crisp your vegetables? After washing, place in a container or zip-lock bag with a wet paper towel & refrigerate.
The Commission now receives supplemental water from Charleston CPW.The Commission began purchasing drinking water from Charleston's CPW in 1997. Up to one million gallons a day (MGD) at first -- then up to 7 MGD by the year 2015 -- will be blended with the 6.3 MGD of drinking water produced by our three RO water treatment plants. This allows us to get the maximum benefit from our current investment in RO and buy only as much extra water as we need to serve future growth. The water from CPW is from a surface supply — the Edisto River and the Bushy Park Reservoir. The treatment for surface water is very different from RO. This is because the constituents being removed from the water are suspended rather than dissolved in the water, and contain high amounts of organic matter.
What is the quality of Mount Pleasant's tap water?Drinking water from MPW and CPW meets or exceeds the standards of the Safe Drinking Water Act. We can provide you with detailed information about drinking water quality upon request. Beginning in 1999, we will provide all our customers with Water Quality Report annually.
If you have any water quality problems or questions, just call Customer
Services at 849-2744.Go to INDEX | Send us
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The EPA 1998 National First Place Award for Operations and Maintenance Program in the Medium Secondary Wastewater Treatment Plant
Category
Chlorine residual in the water system averaged
1.1 ppm (MPW) & 2.5 ppm (CPW)