page 80-97

Question 1

When liquid wastes contain excessive amounts of grease, garbage, flammable wastes, sand, or other ingredients that may affect the operation of a private sewage disposal system, an ___ for such waste shall be installed.

Answer 1

interceptor

Question 2

Waste from interceptors may be discharged to a ______ or other primary system or into a separate disposal system.

Answer 2

septic tank

Question 3

Features of Sewage Treatment Plan (STP)

Answer 3

1. aeration system within the tank
2. submersible mixer to mix the waste
3. sludge waste pump that aids in clarifying
4. decanter
5. blowers
6. fully electronic control system

Question 4

2 Most Common Types of Municipal Sewage Treatment

Answer 4

1. The Activated Sludge Process
2. The Trickling Filter Process

Question 5

Involves a series of stations where the raw sewage must pass through

Answer 5

The Activated Sludge Process

Question 6

gets rid of heavy materials with the use of three different filter houses (The Activated Sludge Process)

Answer 6

First Phase

Question 7

clarifies the effluent (The Activated Sludge Process)

Answer 7

Second Phase

Question 8

hardens the sludge and converts it to fertilizers (The Activated Sludge Process)

Answer 8

Third Phase

Question 9

The Activated Sludge Process produces water with ______ purity

Answer 9

99-99.5%

Question 10

a.k.a ‘Percolating or Sprinkling Filter System’

Answer 10

The Trickling Filter Process

Question 11

Requires less mechanical elements and less stages

Answer 11

The Trickling Filter Process

Question 12

The Trickling Filter Process produces water with___ purity

Answer 12

95%

Question 13

Requires a large ground area for its building

Answer 13

The Trickling Filter Process

Question 14

______ shall not be used as soil, waste and vent pipes.

Answer 14

Rainwater piping

Question 15

Downspout and gutter sizes are based upon the ______ of rainfall per hour falling upon a given roof area in square meters.

Answer 15

maximum depth

Question 16

An ave. ______ rainfall intensity is used around Metro Manila.

Answer 16

102 mm/hr

Question 17

Round, square rainwater pipes may be used for ___.

Answer 17

downspouts

Question 18

Downspouts for high-rise buildings shall be of stronger pipe materials to resist the high ______, they shall be installed within a ______, and have no ______ from the roof to the ground level.

Answer 18

hydrostatic pressure
pipe chase
intermediate branch

Question 19

Roof drains shall be equipped with ______ extending 102 mm above the surface of the roof surface.

Answer 19

dome-type strainers

Question 20

Roof deck strainers shall be approved ___ type, with a total net inlet area not less than 2 times the area of the outlet pipe to which the drain is connected.

Answer 20

flat-surface

Question 21

Roof drains passing through building interiors shall be made ___ by the use of C.I. drain with integrally-cast waterstop ring around the outside of the body and placed at mid-depth of the concrete roof slab and the installation of a clamped suitable flashing material around the drain.

Answer 21

watertight

Question 22

3 Major Systems of Collecting Storm Water

Answer 22

1. The Independent System
2. The Combined System
3. The Natural System

Question 23

a.k.a. ‘the Separate System’

Answer 23

The Independent System

Question 24

Brings collected water directly to the water reservoirs

Answer 24

The Independent System

Question 25

Combines storm water with sanitary wastes

Answer 25

The Combined System

Question 26

Without using any roof gutters or downspouts

Answer 26

The Natural System

Question 27

Also when rainwater is collected in cisterns

Answer 27

The Natural System

Question 28

Storm Drain Locations

Answer 28

Inside Outside Overhead

Question 29

Usually located along the entire perimeter of the roof

Answer 29

The Gutter

Question 30

Located every 8 to 10 meters & at every corner of the roof (but, to avoid clogging of pipes, it is best to locate them every 4 to 6 m)

Answer 30

The Downspout

Question 31

Drain designed to receive water collecting on the surface of a roof and to discharge it into a downspout. Designed to prevent clogging.

Answer 31

The Strainer or Roof Drain

Question 32

At the bottom of the roof leader to direct rainwater towards the nearest catch basin

Answer 32

The Shoe

Question 33

Downspouts should terminate in a ______ (can serve more than one downspout)

Answer 33

catch basin

Question 34

Delivers water to the sewers in the street via gravity

Answer 34

The Catch Basin

Question 35

also collects surface water

Answer 35

Area-Drain-Catch-Basin

Question 36

Connects to each catch basin

Answer 36

The Storm Line

Question 37

Carries only rainwater collected from the storm drain or from the streets

Answer 37

Storm Sewers

Question 38

Terminates at natural drainage areas (i.e. lakes, rivers, and water reservoirs)

Answer 38

Storm Sewers

Question 39

Storm Sewers require ___ to serve as clean-outs and to make sewers accessible for inspection and repair built at depths of about 2 to 3 meters; diameter ranging from 0.6 to 1.2 meters

Answer 39

manholes