WellesleyWeston Magazine


Launched in 2005, WellesleyWeston Magazine is a quarterly publication tailored to Wellesley and Weston residents and edited to enrich the experience of living in two of Massachusetts' most desirable communities.

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Page 99 of 211

The trip through the treatment plant concludes with three rounds of chemical inoculations. To prevent new organisms from growing in the water, it is injected first with chlorine and then with ammonia. The chemicals mix to form monochloramine. This combination is better than chlorine alone because it's less aggressive than chlorine and more stable. That means the water won't smell like a swim- ming pool and the disinfecting protection will reach all the way to Marblehead and Quincy at the far ends of the MWRA system. Fluoride is also added to the water, which makes our teeth more resistant to decay. To protect the pipes, soda ash is injected into the water, raising the pH level and mak- ing water less acidic. Without this adjust- ment, the water could corrode pipes, causing them to leach lead, copper, or iron into the drinking supply. When Flint decided to draw water from its river rather than tap into Detroit's system, officials failed at first to treat it with anti-corrosive chemicals. The lead in the city's drinking water derived from aging pipes, not the river. MWRA and community- 98 W e l l e s l e y W e s t o n M a g a z i n e | s u m m e r 2 0 1 6 A Fantastic Voyage discs perforated with tiny holes. Over the course of 20 to 40 minutes, the water will send our sub back and forth so the dissolved ozone can do its work. After that dizzying trip, the water is treated with sodium bisulfite to remove the ozone. For the second stage of disinfection, we'll need to put on our zero-UV sunglasses. The water flows through tube-like units containing rods glowing with ultra-violet light. This step disrupts the DNA of any bacteria that somehow survived the ozone, rendering the microscopic critters sterile and unable to spread disease.

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