SC4730 Environmental Science
24 April 2014
Virtual Field Trip: Sewage Treatment Plant
Questions 1-15; Page 78-79:
1. How does the plant work? How does it remove solids, reduce organic matter, and restore oxygen to the water?
a. It utilizes the bacteria to emulate and accelerate the natural process of human waste degradation. The wastewater flows by gravity and bar screens let water pass but not most of the trash. Two primary settling basins allow smaller particles to settle. The primary wastewater flows out to the next step. The scrapers collect the solid matter that remains. A surface skimmer collects scum or grease floating on top of the ...view middle of the document...
Does the plant receive storm water (surface runoff) for treatment? Is the plant part of a combined sewer overflow (CSO) system? If Yes, what does this mean?
f. Little no almost no storm water gets combined with the sewage. A lot of work is been done to separate the sewage and storm water.
7. What are some special challenges of treating wastewater?
g. The main issue that should be obvious is the odor. The next big issue is the nitrogen level in the discharged water. Excess of nitrogen could cause hypoxia in Long Island Sound.
8. Is the water treated prior to its discharge? If so, with what?
h. Water Disinfection that is a strong bleach solution (sodium hypochlorite) used to kill any remaining organisms in the water from the final settling tanks. Water DE chlorination is second, chemical (sodium bisulfite) used to neutralize the bleach prior to the now completely clean water’s discharge to the Norwalk River.
9. Where is the treated water discharged?
i. Norwalk River then finally in Long Island Sound in a short distance.
10. Who monitors the discharge of treated effluent to ensure that it meets the standards? What are some of the standards? What happens when they are not met?
j. Connecticut Department of Energy & Environmental Protection (CT DEEP)
11. How many people does the plant serve? How many industries are connected to the sewage system?
k. The plant serves all of Norwalk, Wilton and...