Math test bonus:
Year = 100, Charges = $666.66, Interest Rate 19.75%
Find the total after 100 years (answer: $44818426657.29)
- you will need your computer and headphone for music on Monday
- compose 5 IT sentences, and 3 sentences that begin with adverbs
e.g. It is necessary to eat a healthy breakfast every morning
It is very important to study for all tests in the evenings
Suddenly, Mr Kwok screams at the students outside Room 109
7B Water Filtration Videos (2)
Water Filtration Video
https://www.youtube.com/
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)17) Injecting UV radiation into waste water scramble the bacteria _________ so they cannot m______________
18)Effluent release: pumps treated water back into the ___________ and ___________
https://www.youtube.com/watch?
20) There are two types of water treatment plants, treating d_____________ and w_________________
21) Turing dirty water or well water to safe drinking water is important to everyone, and it involves 4 steps
22) Step 1: C____________________ and F___________________ get water from l_________, w_________, r_____________ and s__________
23) The water from these places contains o______________ materials and s____________ (s_________, b_________, w________) and must be removed first
24) Chemical coagulate is added the water to gel the s____________ together so they become larger clumps
25) Flocculation basins involve s_________ and mixing of materials to form floc particles
26) Step 2: Sedimentation basins allow the f_________ to settle out and sink to the b__________. The sludge is then collected and ship to the l_____________
27) After sedimentation, we have c__________ w________ at the top
28) In the flotation tanks, a______ is pumped to the bottom of tank so b____________ carry f_______ particles to the top
29) Step 3: Filtration, even water looks clean, it may still carry b________ ad very s___________ sediments (clay, silt)
30) S___________ filters can be used in two way to remove those particles. More commonly, water enters from the bottom and exit through the top or vice vera.
31) Sand filters are highly e_______________
32) The acceptable clarity of water is less than ________ NTU (how many particles in water)
33) Activated carbon basins improve the t_________ and o_______ of water
34) Step 4: Disinfection. They may add c__________, o__________ or UV r__________ to kill microorganisms in the water
35) In the USA, it is most common to add c_________ to disinfect
36) UV radiation scrambles the DNA of bacteria so they cannot reproduce but this method does not last l__________
37) After disinfection, the water is ready to be prepared to send to the local water pipes
38) When pumping water to the local communities, w_________ p__________ must be maintained to prevent c_________________ from outside
39) The function of a water tower is to s___________ water and to maintain f____________ of water to all households in the area.
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