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Project:
North Mission Water Treatment Plant
Client:
City Of Mission
Location:
Mission, Texas
The North Mission WTP has a firm treatment capacity of 4.0 million gallons/day and has been designed to be readily expanded to 8.0 mgd in its next stage and up 24 mgd in the future. The water treatment plant incorporates conventional treatment concepts using established technology. Emphasis was placed on reliability and minimum maintenance of mechanical equipment. The plant has been designed to cope with more stringent drinking water standards anticipated in the future as well as dealing with changing conditions in the raw water supplied. The plant is equipped for total automation of the process with control and monitoring readily available using the supervisory control and data acquisition system.
When called for by the ground storage tank, raw water is pumped from the reservoir to the treatment plant. Just prior to entering the treatment facilities oxidants, coagulants and other chemicals are added to the raw water. The water next enters the primary mixing basin to provide complete mixing of the recently injected chemicals. Water then flows to two (2) upflow solids contact reactor clarifiers where a settleable floc is formed and settled to the bottom of the clarifier making a sludge blanket for recirculation. Water exits off the top of the clarifiers via the radial launders and then flows to the secondary mix basin where chlorine dioxide the primary disinfectant is added. Water from the secondary mix basin flows through an influent flume from the outside wall of the filter to the flow splitter box mounted on the central valve access and waste column of the filter. Water is then evenly split to the four (4) high-rate filters. After filtration water flows into a clear well where transfer pumps are used to lift water into the two million gallon ground storage tank. High service pumps with variable frequency drives are used to supply water to distribution.
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