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Water Treatment Plant

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Water Treatment Plant

  1. 1. by Amber Stacy<br />Water Treatment<br />
  2. 2. Water<br />Water is undoubtedly the most important compound to all life on Earth<br />Ensuring the quality of water is essential to the health of humans, fish, and plants, as well as all other living organisms<br />In this study, my focus is geared toward the history and processes of the Water Treatment Plant located at 501 Wesley Street in Greenville, Texas<br />
  3. 3. Greenville Water Treatment Plant<br />1926 1stWater Treatment Plant constructed<br />1955 facility was upgraded<br />capacity to process 6 MGD<br />1994 facility was upgraded again<br />increased its processing capacity to 13 MGD<br />cost $7.1 million dollars<br />Supplies treated water to Greenville, Caddo Mills, Jacobia, Cash, & Shady Grove<br />Manned & operated 24 hours a day<br />
  4. 4. Greenville Water Treatment Plant<br />Treated w/ Fluoride -average dose of 1 PPM<br />A combination of Chlorine & Ammonia are added as a disinfectant - average dose of 3 PPM (in accordance with state and federal regulations)<br />This Water Treatment Plant has 2 sources of raw water <br />primary source - series of off channel reservoirs, north side of Greenville, Reservoirs #4 and #5<br />secondary source - Lake Tawakoni, used during the dryer seasons of the year<br />both refilled by the Sabine River<br />
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  6. 6. Greenville Water Treatment Plant<br />1997 & 1998, installed Supervisory Control and Data Acquisition (SCADA) <br />Connected the Water Treatment Plant & Waste Water Plant<br />Improved data collection & provided operational cost savings, which also kept the cost of water services for consumers down <br />$3.5 billion dollars to operate water systems throughout U.S.<br />
  7. 7. Greenville Water Treatment Plant<br />Brian Smith, Treatment Plant Superintendent gave me a tour facility on March 13th <br />Raw water pumped via pressure system into open surfaced treatment tanks<br />Chemicals are introduced & stirred<br />Water is then transferred to adjacent tank<br />Film accumulates on surface, then sinks when becomes denser than underlying water<br />Rake at bottom scrapes gunk into drain to collecting tank<br />
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  9. 9. Greenville Water Treatment Plant<br />Collecting tank is cleaned out every 4 months <br />Gunk placed into on-site lagoon<br />lagoon is dredged &cleaned out every 3 to 4 years<br />That sludgy muddy gunk is then transported to a landfill or spread out over land<br />Sludge is not dangerous in any way<br />does not need to be treated with any special precautions<br />It is essentially just the particulates of dirt, organic matter, silts, and etc., that is brought in with the raw water that is filtered out<br />Naturally present in the environment<br />
  10. 10. Greenville Water Treatment Plant<br />Cleaner water left behind transferred to series of other adjacent tanks to repeat the process<br />Then the water is drained to the other side of the facility to undergo filtration<br />
  11. 11. Greenville Water Treatment Plant<br />The ‘filters’ used in the filtration process are a series of finely graded sand, course rocks, & Anthracite<br />Water percolates through these layers<br />Filters are cleaned out every 120 hours<br />Potable (finished) water tested for 140 different factors at conclusion of treatment process &every 2hours thereafter to ensure quality<br />
  12. 12. Greenville Water Treatment Plant<br />Finally, water is pumped to various on-site storage tanks & water towers for public use <br />given there are no problems that with the tests<br />
  13. 13. Greenville Water Treatment Plant<br />Capable of processing 13 MGD<br />However, daily processing depends on current demand<br />Minimal capacity day, usually during the winter months, Plant processes about 4 MGD<br />Maximum capacity day, during the summer when everyone is washing cars & watering lawns, Plant process about 7 MGD <br />2 on-site tanks hold 1million gallons of water each<br />New on-site tank holds 1.2 million gallons of water<br />Industrial tank holds 1million gallons of water<br />
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  15. 15. Greenville Water Treatment Plant<br />Employees must :<br />Already have 1 year experience <br />Take 3 hydrology courses <br />Attain a Class D Water Treatment License<br />Employees will continue taking various water &operations courses to maintain quality &obtain higher licenses<br />Class C, B, & A licenses<br />Ultimately, Class A Water Treatment License can be earned, which is the highest license<br />Optional but fully qualifies &allows independent operation<br />
  16. 16. Greenville Water Treatment Plant<br />Fully staffed w/ 8 employees <br />including the superintendant<br />only 1 technician is required to run the Plant<br />norm for night shift<br />Employees walk facility…to ensure volume of water & treatment chemicals used match computerized & hand written reports <br />…visually inspecting for leaks<br />…reading gauges<br />…collecting & testing water samples<br />Employees also continuously check computers, equipment, chemical tanks, &computer generated reports to ensure that everything is running correctly<br />
  17. 17. Greenville Water Treatment Plant<br />Mechanical & Computer Failures:<br />Initial circulation tank’s paddle-like stirrers broke down<br />Cost Greenville $14 thousand dollars to replace<br />Computer meltdown, all but 2 machines computerized, major issue<br />Reserves were draining quickly<br />Computer programmer hired to reprogram the network of computers<br />The Plant was out of operation for about 5 hours<br />
  18. 18. Greenville Water Treatment Plant<br />
  19. 19. Greenville Water Treatment Plant<br />No significant contamination issues <br />Minor ones are rare &handled before potable water ever leaves Plant<br />Toxic substances such as pesticides, antifreeze, &motor oil do not seem to be an issue for the Plant<br />Even if a vehicle does happen to crash into raw water source, contaminants become diluted by the surrounding water &removed from water supply by treatment &filtration before it ever leaves the Plant for consumer use<br />Afew fish make it in the treatment tanks<br />they die from the introduction of chemicals &the treatment process itself<br />Once discovered they are quickly removed<br />
  20. 20. Greenville Water Treatment Plant <br />Extreme flooding causes water surplus <br />Not an issue because water re-circulated through system &stored in on-site reserve tanks<br />Droughts cause a deficit in water supply<br />Major issue <br />Expensive dredging of reservoirs to remove buildup, blockages, & silt from intake pipes<br />Greenville participates in Conservation & Drought Contingency Plan<br />Very detailed plan, where conditions reach certain criteria (in stages), rules implemented & enforced, & fines are assessed for violations<br />
  21. 21. Greenville Water Treatment Plant<br />There are various water reports on file:<br />The City of Greenville Drinking Water Quality Report or Consumer Confidence Report (CCR) <br />generated annually<br />2008 report will be publicly available in July 2009<br />latest information is from 2007 report<br />lists detected contaminants & gives specific details about each one<br />Source of contaminants<br />Detected levels of contaminants<br />TCEQ required levels & limitations<br />
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  23. 23. Greenville Water Treatment Plant<br />Monthly Operating Report which is an internal report <br />generated monthly by Superintendent, Brian Smith<br />report gives details on: <br />monthly rainfall<br />raw & finished flow<br />analytical data<br />chemical usage data<br />finished treated water cost per 1,000 gallons<br />monthly violations<br />

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