WorksheetsPre-Test - EFFLUENT TREATMENT PLANT & BIO-POLISHING PLANT
Total questions: 27
Worksheet time: 17mins
Identify Pond in the Pre-Treatment Stage
Cooling and Mixing Pond
Sludge Pit
Anaerobic Pond
Facultative Pond
What is meant by BOD?
Amount of Nitrogen consumed by microorganisms
Amount of Dissolved Oxygen consumed by microorganisms
Amount of Phosphorus
Amount of Oil content
Identify all sources of effluent?
EFB Juice & Sterilizer Condensate
Oil Room, Sterilizer Condensate & Hydrocyclone
Oill Room
Oil Room & Sterilizer Condensate
If a mill process continuously for 24 hours with throughput 40 mt/h, how much effluent discharge to effluent?
768 mt/d
800 mt/d
650 mt/d
900 mt/d
What is initial BOD reading for RAW POME in mg/L?
40,000 - 50,000 mg/L
25,000 - 35,000 mg/L
5,000 - 10,000 mg/L
60,000 - 70,000 mg/L
What is the minimum Hydraulic Retention Time, HRT (days) for Cooling Pond?
(a)
What is the minimum Hydraulic Retention Time,HRT (days) for Anaerobic Pond?
(a)
What is the minimum Hydraulic Retention Time, HRT (days) for Facultative Pond?
(a)
What is the minimum Hydraulic Retention Time,HRT (days) for Algae Pond?
(a)
What is the Maximum Allowable Percentage of Charging into Anaerobic Digester Tank?
10%
5%
15%
25%
If the Capacity of the Anaerobic Tank is 1,500mt, and total plate height with 6 plate with 5ft for every plate. What is the max level based on max allowable charging?
2.0 ft
1.5ft
1.0ft
2.5ft
What is the optimal pH range for anaerobic digestion?
5.5 – 6.0
6.8 – 7.2
7.5 – 8.5
4.0 – 5.0
What is the ideal range for Total Alkalinity (TA) in ppm as CaCO₃?
500 – 1500 ppm
2000 – 5000 ppm
6000 – 8000 ppm
100 – 500 ppm
What is the ideal range for Total Volatile Acid (TVA) in ppm as CaCO₃?
<300
<400
<500
<600
If the pH in the digester drops below 5.5, what is the appropriate corrective action?
Charging more POME
Add acetic acid
Add soda ash
Add new bacteria
Where Solid from Anaerobic Tank should be drain?
Drying Bed /Sand Bed
Facultative Pond
Mixing Pond
Algae Pond
What is the activated sludge process based on?
Continouos Aeration
Chemical precipitation
Sedimentation only
Chlorination
Identify all basic components/equipments for Activated Sludge System (Bio-Polishing Plant)
1) Aeration Tank/Bio-Fill Tank/Aeration Pond
2) Clarifier
3) RAS Pump
4) WAS Pump
1) Aeration Tank/Bio-Fill Tank/Aeration Pond
2) Clarifier
3) RAS Pump
4) WAS Pump
5) Blower
6) Aeration Equipment (Diffuser/Surface Aerator/Submerged Aerator)
1) Aeration Tank/Bio-Fill Tank/Aeration Pond
2) Clarifier
3) RAS Pump
1) Aeration Tank/Bio-Fill Tank/Aeration Pond
2) Clarifier
3) Algae Pond
What is the main role of microorganisms in the activated sludge process?
Add color to the wastewater
Increase sludge volume to be settled down
Break down organic matter
Produce ammonia
If the SV30 reading is > 35%, what should be done?
Operate WAS Pump
Operate RAS Pump
Stop Feeding Pump
Stop Blower
What is the reading for SV30 (%) for the 1000 mL sample
30%
20%
60%
50%
What is the most optimum SV30 reading?
<5%%
5-10%
15-35%
>35%
Calculate the Sludge Age of the Activated Sludge system using the following data:
MLSS: 6000 mg/L
Vr: 500 m3
WAS: 3600 mg/L
Qwas: 50 m3/d
Sludge Age,θ = (MLSS x Vr) ÷(WAS x Qwas)
Identify if the Sludge Age is Young Sludge or Old Sludge
Young Sludge
Old Sludge
What is an indicator Bio-Polishing Plant operate at good condition?
Thick dark brown and greasy foam on the surface of the tank
Slight brownish foam or fine bubble in the aeration basin, the final discharge produced is clear with no visible suspended solids
Thick white foam on the aeration tank
What does it mean by Low FM Ratio?
High Food, High Microbe
Low Food, Low Microbe
High Food, Low Microbe
Low Food, High Microbe
If FM Ratio is Low, what should be done?
Perform WAS
Perform RAS
Stop Operation Blower
What is the best DO Level in Bio-Polishing Plant?
1-2 mg/L
4-6 mg/L
6-10 mg/L
>10 mg/L