November 7a for Class 7C

 Essay: How do you feel about virtual learning?

- 8 adjectives, 5 adverbs

- Google the words that are related to your feeling about virtual classes (125 words)

- anxious, uneasy, depressed, nervous, lazy, not motivated, -ly

Area of trapezoids

Water Filtration Video

 https://www.youtube.com/watch?v=FvPakzqM3h8

Watch the video above and find the missing information in the worksheet below.

1)    All wastewater in the city goes to a t___________________________ so it turns back into _______________________

2)    It all starts when we flush the t______________

3)    New York City has ___________ water treatment plants and they treat a total of __________ billion gallons each day

4)    There are __________ water treatment plants in the USA

5)    Step 1: The larger items, including w__________ and t________ are separated by b______ screens and they are trucked to the l________________

6)    The main objective of pre-treatment of sewage water is to make sewage less c_______________

7)    Step 2: The grit chambers let the s_________ and r_________ settle out, and there are _____ types of grit chambers: Horizontal, Aeriated, and Vortex

8)    Step 3: Primary Clarifiers: the waste water (without solids, sand and rocks) then  pump into the primary clarifier to remove all o____________ m__________

9)    Afterwards, the top level of water flows into s______________ treatment

10) Step 4: Secondary treatment moves b___________ content and it creates thousands of b___________ in the aeration basins

11)Basically, in this stage, the process let the b__________ eats the organic food

12) During the aerobic digestion process, bubbles inject o__________ into the water and this breaks down the o____________ matters

13)Step 5: Secondary Clarifiers: this is the final removal of s________ and b__________ matters. It also involves d_______________ where 85% of the organic matters are removed

14)Disinfections: there are _______ ways to disinfect the waste water. Adding C_________, O________ or UV radiation. 

15)Adding C_________ kills the bacteria and they are removed before discharging to the ____________

16)Pumping O__________ into the waste water will kill off the bacteria

17)Injecting UV radiation into waste water scramble the bacteria _________ so they cannot m______________

18)Effluent release: pumps treated water back into the ___________ and ___________