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Advanced Wastewater Treatment

Course: Waste Water Engineering — Practice MCQs, solutions, formulas & past entrance questions.

Courses › Waste Water Engineering › Advanced Wastewater Treatment

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Advanced-Wastewater-Treatment (Click to view content)

1. What is maximum acceptable limit of temperature for RO?

20˚C 30˚C 40˚C 50˚C

40˚C

In order to reduce effects of temperature to a minimum, acceptable upper limit is 40�C. RO systems operate at 25�C usually.

Hint Answer

2. Which of se do not cause scaling of membranes?

Organic and inorganic colloids Calcium sulphate Silica Calcium carbonate

Organic and inorganic colloids

The organic and inorganic colloids do not cause scaling of membranes. Scaling is caused by silica and calcium salts. This is also caused by metal oxide formation.

Hint Answer

3. In RO, solvent passes through membrane at a much faster rate than dissolved solids.

True False

True

In RO, solvent (water) passes through membrane at a much faster rate than dissolved solids (salts). The net effect is that a solute-solvent separation occurs, with pure water being product.

Hint Answer

4. Water softener units work most efficiently with particulate water.

True False

False

Water softener units work most efficiently with particulate-free water. Ion exchange units that replace calcium and magnesium ions from water are known as water softeners.

Hint Answer

5. Calculate number of membranes required for following data:
Flow: 535 m³/h.
Area: 400 m²
Flux considered: 12 lmh

112 115 117 120

112

Number of membranes is calculated based on flow and area. Flux is generally fixed based on TDS present in raw water. Number of membranes = Flow x 1000/flux/area. A number of membranes = 535/400/12=112.

Hint Answer

6. What is percentage of swelling between chlorine and hydroxide forms?

10% 20% 30% 40%

30%

The difference in total capacity of Amberjet 4400 is just due to resin swelling, it swells by up to 30 % between Cl^? and OH^? form.

Hint Answer

7. At what temperature is filtrate dried in a TDS laboratory test?

100˚C 102˚C 103˚C 105˚C

103˚C

In a laboratory setting, total dissolved solids are determined by filtering a measured volume of sample through a standard glass fiber filter. The filtrate (i.e., filtered liquid) is n added to a preweighed ceramic dish that is placed in a drying oven at a temperature of 103?C.

Hint Answer

8. What is surface area of gel resin?

0.01m²/gm 0.5 m²/gm 1-2m²/gm 2-4 m²/gm

0.01m²/gm

The surface area of gel resin is 0.01 m²/gm. The surface area is extremely negligible. Macro porous resins have larger areas.

Hint Answer

9. What is surface roughness of BW30 membrane?

60 nm 62.6 nm 64.5 nm 66.2 nm

62.6 nm

The surface roughness of BW30 is 62.6 nm and that of NF270 is 4.1 nm. The sodium ion rejection is 35.8% and that of calcium ions is 57.5%.

Hint Answer

10. In a bubble column reactor, fresh water enters from _____of column.

Bottom Top Side Top and side

Bottom

Commercial systems typically use a bubble column reactor, where air is bubbled through a vertical column that is liquid full of hot and pressurized wastewater. Fresh wastewater enters bottom of column and oxidized wastewater exits top.

Hint Answer

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All Chapters

View all Chapter and number of question available From each chapter from Waste-Water-Engineering

Wastewater Flow Rates, Collection and Conveyance of Sewage

Wastewater Flow Rates, Collection and Conveyance of Sewage

Hydraulic Design & Construction of Sewers

Hydraulic Design & Construction of Sewers

Sewer Appurtenances & Sewage Pumping

Sewer Appurtenances & Sewage Pumping

Valves, Blowers & Wastewater Characteristics

Valves, Blowers & Wastewater Characteristics

Natural Methods of Wastewater Disposal, Chemical Reaction Engineering and Waste Water Treatment

Natural Methods of Wastewater Disposal, Chemical Reaction Engineering and Waste Water Treatment

Unit Operations for Wastewater Treatment

Unit Operations for Wastewater Treatment

Preliminary Treatment

Preliminary Treatment

Types of Settling Tank

Types of Settling Tank

Sewage Filtration

Sewage Filtration

Activated Sludge Process

Activated Sludge Process

BOD Removal Methods & Miscellaneous Methods

BOD Removal Methods & Miscellaneous Methods

Treatment and Disposal of Sludge

Treatment and Disposal of Sludge

Septic Tanks, Oil and Grease Removal

Septic Tanks, Oil and Grease Removal

Advanced Wastewater Treatment

Advanced Wastewater Treatment

House Drainage

Rural Sanitation

Rural Sanitation

Corrosion control & Instrumentation

Corrosion control & Instrumentation

Topics

This Chapter Advanced-Wastewater-Treatment consists of the following topics

Advanced Wastewater Treatment

What is maximum acceptable limit of temperature for RO?

Which of se do not cause scaling of membranes?

In RO, solvent passes through membrane at a much faster rate than dissolved solids.

Water softener units work most efficiently with particulate water.

Calculate number of membranes required for following data:
Flow: 535 m³/h.
Area: 400 m²
Flux considered: 12 lmh

What is percentage of swelling between chlorine and hydroxide forms?

At what temperature is filtrate dried in a TDS laboratory test?

What is surface area of gel resin?

What is surface roughness of BW30 membrane?

In a bubble column reactor, fresh water enters from _____of column.

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