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WorksheetsMEDP - Day 1 Quiz - Pretreatment
Total questions: 41
Worksheet time: 27mins
WARMING up : How many operating mode(s) in MEDP ?
One - SW only
One - RW only
Two - SW and RW mode
One - Chinling's mood =,='''
Plant start up : During intake dump, intake pump and intake dump valve FCV1400-01 is operated at ?
pump at fix speed, intake dump valve at PRESSURE control
Pump at fix speed, valve at fix position
Pump at FLOW control, valve at fix position
Plant start up : What determine completion of intake dumping step ?
it stops by itself
Timer
Turbidity check in plant
Conductivity check in plant
Plant Start Up : What is the overall sequence of dumping ?
Intake dump > UF Feed Dump > RO Feed Dump > UV dump
Intake dump > DAF Trains Dump > RO Feed Dump
Intake Dump > RO Feed Dump > UV Dump
Plant Start up : UF Feed dump - what determines the completion ( end step )?
Timer for quality check
Turbidity of DAF running Trains
Conductivity at outfall
all above
Plant Start Up : What is the UF Feed Pump control sequence before RO train start up
1 , 2 , 3, 4
2 , 1 , 4, 3
1, 2, 4, 3
PLANT Start up : Before starting up UF trains,
UF Filtrate header is pressurized
Open analyzer isolation valve at RO trains
SDI is checked at UF Feed
Intake : Chinling's oil tanker spill at Intake. Oil and Grease >10ppm.
Run plant as usual
Notify PUB, Plant needs to shutdown as its higher than design threshold limit
Intake : When shock chlorination to intake screen is carried out ?
Reservoir water mode
Seawater Mode
Any mode
Intake : Why shock chlorination to intake screen is required during SW mode ?
SW is smelly
to prevent marine creatures growth
To scare fishes away intake screen
Intake : Intake screen is cleaned by ?
Backwash
CEB
CIP
Air Blast
Intake : Intake screen size ?
20 mm
5 mm
10mm
0.04mm
Intake : during plant in RUNNING, intake pumps are controlled by ?
A. Pressure control at discharge header
B. Flow control to meet UF feed flow
C. DAF Effluent Wet Well level trim
B and C
DAF : What quality required for DAF outlet ?
pH > 8
Turbidity <= 5 NTU
Conductivity >20,000uS/cm
There is no monitoring on quality
DAF: What is the target pressure for air saturator (recycling pump discharge pressure) ?
2 bar
4 bar
6 bar
no requirement
DAF Inlet: What chemicals are dosed ?
FeCl3
H2SO4
Polymer
All above
DAF : Why FeCl3 is dosed at DAF inlet ?
Color looks nice =)
To decrease pH
As Coagulant to coagulate particles
DAF : In lab, what test to carry out to estimate chemical dosage (Acid, FeCl3, polymer) required for DAF?
SDI
Jar Test
All above
None of them
DAF : What does the DAF Train outlet FCV valve control ?
Pressure of recycling pump discharge
Level of DAF Effluent Wet Well
Level in respective DAF Trains
DAF : SW mode - To meet pH 7, the more FeCl3 ppm is dosed,
The more H2SO4 dosage (ppm) required
No change in H2SO4 dosage (ppm)
The lesser H2SO4 dosage (ppm) required
Strainers : What is strainers size ?
200 microns (um)
50 microns (um)
100 microns (um)
5 microns (um)
Strainers : What BW flow is required ?
550 m3/hr
650m3/hr
850m3/hr
I never notice when i run the plant
Strainers : What triggers Strainer Backwash ?
Timer
Filtration volume
either one, whichever come first
None of them
Strainers : How many sources to top up Strainer backwash tank ?
1
2
3
4
Strainers : SW mode - which source used to top up Strainer BW tank ?
A. Strainer filtrate (during plant startp/shutdown)
B. SWRO (RO 1st Pass) Brine
C. BWRO (RO 2nd Pass) Brine
A and B
Strainers : SW mode - why RO 1st Pass Brine is be used for Strainer BW ?
Good quality (Turbidity)
Good quality (pH)
Good quality (Conductivity)
Good quality (ORP)
Strainers : SW mode - why RO 2nd Pass Brine is NOT used for BW ?
To lousy quality. It's discharged to outfall
Too good quality. It's recycled to UF filtrate header.
I wish to know
Strainers : RW mode - which source used to top up Strainer BW tank ?
A. Strainer filtrate (during plant startp/shutdown)
B. SWRO (RO 1st Pass) Brine
C. BWRO (RO 2nd Pass) Brine
A and C
UF : If SDI needs to be carried out at UF Feed, which shall be used ?
SDI 15 mins
SDI 5 mins or 10 mins
UF : Which is used to check UF Filtrate SDI ?
SDI 15 mins
SDI 5 mins or 10 mins
UF : What is quality required for UF Filtrate (no UF membrane breakage) ?
SDI ≤ 3
Turbidity ≤ 0.1 NTU (95%)
Both
UF : What is UF membrane pore size ?
10 microns (um)
1 microns (um)
0.02 micron nominal, 0.05 micron max.
5 microns (um)
UF : What is UF CIP filter size ?
10 microns (um)
1 microns (um)
0.04 microns (um)
20 microns (um)
UF : What decide number of UF Trains required ?
UF Filtrate Header pressure
Switch Flux
It's fixed for SW and RW mode
UF : UF Train filtration step is ended by ?
A. Filtration duration of 2 hours
B. Filtration volume
A and B, whichever come first
None of them
UF Backwash : What is the flux required?
240 lmh
120 lmh
Doesn't matter
UF Backwash : Why BW pump is in re-circulation between UF trains entering backwash ?
to minimize start and stop of BW pump
to keep BW tank level
To keep pressure at BW pump discharge
UF : CEB 1 has 1A and 1B. What they are?
1A is low pH, 1B is high pH
1A is high pH , 1B is low pH
UF : CEB 1A is high pH to remove organic foulant. Which chemical(s) is used ?
NaOCl and NaOH
H2SO4 only
NaOCl and H2SO4
H2SO4 and FeCl3
UF : CEB 1A - during chemical rinsing step, what is dosed at UF Concentrate line (to EQ tank) and its purpose ?
H2SO4 - to decrease pH
SBS - to remove chlorine
NaOH to increase pH
No chemical is dosed
UF CEB : 1B is low pH to remove inorganic foulant. Which chemical is used ?
NaOCl and NaOH
H2SO4 only
NaOCl and H2SO4
NaOCl and H2SO4
