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74 result(s)

BT503 Final Term AI Solved

Q20

Disposal of sludge in the mining areas is known as--------.

A) Ocean disposal
B) Sanitary Landfill
C) Maturation ponds
D) Land reclamation

AI Explanation

Disposal or placement of sludge in mining areas can be used to restore and improve disturbed land. This practice is known as land reclamation.

BT503 Final Term AI Solved

Q21

Removal of organic matter in sludge management is known as-------.

A) Dewatering
B) Disinfection
C) Volume reduction
D) Mass reduction

AI Explanation

Removal or destruction of organic matter reduces the mass of solids in sludge. This is therefore considered a mass reduction process rather than dewatering, which primarily removes water.

BT503 Final Term AI Solved

Q22

Density of sludge in processing stages is close to?

A) 100kg/m3
B) 1000kg/m3
C) 10kg/m3
D) 500kg/m3

AI Explanation

The density of sludge is generally close to that of water, which is approximately 1000 kg/m³. The exact density varies with solids concentration and composition.

BT503 Final Term AI Solved

Q23

If the sludge is to be incinerated then the following --------process is not necessary.

A) Dewatering
B) Stabilization
C) Disinfection
D) Thickenng

AI Explanation

When sludge is destined for incineration, the high temperatures involved destroy pathogenic microorganisms. Therefore, a separate disinfection step is generally unnecessary.

BT503 Final Term AI Solved

Q24

Type of centrifuges mostly used in the dewatering process are called------------.

A) Microfuge mini centrifuge
B) Horizontal-shaft centrifuge
C) Vertical-shaft centrifuge
D) Refregirator centrifuge

AI Explanation

Horizontal-shaft centrifuges, commonly called decanter centrifuges, are widely used for sludge dewatering. They continuously separate water from sludge solids using centrifugal force.

BT503 Final Term AI Solved

Q25

The design of sludge treatment and final disposal stages is based on which of the following?

A) Sludge flow
B) Dry solids load
C) None
D) Both

AI Explanation

The design of sludge treatment and final disposal facilities is primarily based on the quantity of dry solids produced. Dry solids load determines the required capacity of treatment and disposal units.

BT503 Final Term AI Solved

Q26

Sludge drying lagoons are used for________.

A) Thickening
B) Complementary digestion
C) Dewatering
D) All

AI Explanation

Sludge drying lagoons can provide dewatering and may also allow further digestion and thickening of sludge. Thus, all of the listed functions can be associated with sludge drying lagoons.

BT503 Final Term AI Solved

Q27

The pH of the medium will be ----------when lime is added to the digested sludge, in the sludge disinfection process.

A) Amphotaric
B) Basic
C) Acidic
D) Neutral

AI Explanation

Adding lime to digested sludge raises its pH substantially. The resulting alkaline or basic conditions help inactivate pathogenic microorganisms during sludge disinfection.

BT503 Final Term AI Solved

Q28

Among dewatering processes the process which is least used is called ---------.

A) Strip method
B) Drying beds
C) Sludge lagoons
D) Stabilization

AI Explanation

Sludge lagoons are among the less commonly used methods for sludge dewatering compared with drying beds and mechanical processes. They require substantial land and relatively long retention times.

BT503 Final Term AI Solved

Q29

Facultative ponds require how much time for sludge removal from liquid phase?

A) Decades
B) Weeks
C) Days
D) Months

AI Explanation

Facultative ponds can retain sludge for very long periods because solids accumulate gradually at the bottom. Consequently, sludge removal may be required only after many years or even decades.

BT503 Final Term AI Solved

Q30

Time required for the accumulation of discarded sludge from WWTPs is------------.

A) 2 years
B) 4 years
C) 3-5 years
D) 3 years

AI Explanation

Discarded sludge from wastewater treatment plants may accumulate over several years before removal or further management is required. A typical period given for accumulation is about 3–5 years.

BT503 Final Term AI Solved

Q31

In UASB + polishing pond dry solid level ranges between?

A) 4-5%
B) 2-3%
C) 3-4%
D) 1-2%

AI Explanation

In UASB treatment followed by polishing ponds, the sludge generally has a relatively low dry-solids concentration. The dry solid level is typically around 1–2%.

BT503 Final Term AI Solved

Q32

In a dewatering process the dry solid level in the dewaterd sludge of filter press ------------------.

A) 20-30%
B) 30-45%
C) 25-40%
D) 80-90%

AI Explanation

Filter presses are effective mechanical dewatering devices that can produce sludge cakes with relatively high solids content. A typical dry-solids concentration for filter-press dewatered sludge is approximately 20–30%.

BT503 Final Term AI Solved

Q33

Thermal decomposition process by oxidation is known as _______.

A) Sanitary landfill
B) Land reclamation
C) Land farming
D) Incineration

AI Explanation

Incineration is a thermal treatment process in which sludge is subjected to high temperatures and organic matter is oxidized. This substantially reduces the volume and destroys combustible organic components.

BT503 Final Term AI Solved

Q34

Time period required to carry out compositing through in-vessel biological reactors is normally-----------.

A) 14-21 hours
B) 14-21 days
C) 30-60 days
D) 50-90 days

AI Explanation

In-vessel composting uses controlled biological reactors to accelerate decomposition under managed conditions. The composting period is commonly around 14–21 days, depending on operating conditions.

BT503 Final Term AI Solved

Q35

--------is a land disposal process, in which the organic substrate is biologically degraded in the upper layer of the soil and the inorganic fraction is transformed or fixed into this layer.

A) Ocean disposal
B) Land farming
C) Sanitary Landfill
D) Maturation ponds

AI Explanation

Land farming is a land disposal and treatment method in which organic contaminants are biologically degraded in the upper soil layer. Inorganic components may be transformed or immobilized within the soil.

BT503 Final Term AI Solved

Q36

The process in which decomposition of aerobic organic matter is achieved through controlled conditions of temperature, water content and nutrients is known as --------

A) Percolation
B) Filterable assembly
C) Lime stabilization
D) Compositing

AI Explanation

Compositing refers to the controlled biological decomposition of organic matter under aerobic conditions. Temperature, moisture, oxygen, and nutrients are managed to support effective decomposition.

BT503 Final Term AI Solved

Q37

Microbes capable of utilizing a variety of carbon sources and degrading a number of typical contaminants are commonly found in_______.

A) Sewage
B) Air
C) Water
D) Soil

AI Explanation

Soil contains diverse microbial communities capable of using many carbon sources and degrading various contaminants. These microorganisms are important in natural biodegradation and bioremediation processes.

BT503 Final Term AI Solved

Q38

The underlying relevnt processes for the biological mechanisms is/are -------------.

A) All of the above
B) biosorption
C) demethylation
D) methylation

AI Explanation

Biosorption, demethylation, and methylation are biological processes that can contribute to contaminant transformation or removal. Therefore, all of the listed processes are relevant biological mechanisms.

BT503 Final Term AI Solved

Q39

---------------method is more sophisticated and refined used normally in bioremediation.

A) Biosparging
B) Bioventing
C) Injection Recovery
D) All

AI Explanation

Biosparging, bioventing, and injection-recovery approaches can be applied in engineered bioremediation systems. These methods provide controlled treatment of contaminated environments and can be more sophisticated than simple natural attenuation.