SC4730
Unit 6 Lab

1. The DC Water and Sewer Authority (DCWASA), collects waste and storm water. Once it collects the waste and storm water it puts it through a nitrification/de-nitrification, effluent filtration, chlorination/de-chlorination and post aeration process. For solid wastes, the treatment includes thickening and dewatering processes and other processes such as screen and de-gritting processes, gravity thickeners, dissolved air flotation thickeners, sludge blending centrifuge dewatering.

2. DC WASA provides training for its employees depending on the expertise in the area they work in.

3. Raw water, waste water and storm water is separated at collection to avoid contamination and overflowing

4. All primary sludge and all of the nitrification and de-nitrification waste active sludge is demolished and also lime stabilized. All waste collected by the District of Columbia sewer system, Virginia and Maryland is delivered to the Blue Plains Advance Wastewater Treatment Plant.

5. Some nontoxic sludge can be used as soil conditioner and also as fuel, since it produces methane gas.

6. Yes, the plant uses a combined sewer overflow system to collect both the waste water and storm water in parts where it’s necessary.

7. One of the challenges of treating waste water is controlling toxic chemicals through special treatments and trying to minimize the amount of nutrients such as phosphorus and nitrogen from leaking into rivers.

8. The water is treated to remove solid wastes, reduce organic matter and pollutants and restore oxygen.

9. Once the water is treated, it’s taken or discharged at the Dalecarlia and McMillan water plants. The source of raw water for both of the water plants is the Potomac River.

10. The U.S. Environmental Protection Agency.

11. It serves a population of 1.6 million people, and